Chris@34: /* libFLAC - Free Lossless Audio Codec library
Chris@34:  * Copyright (C) 2001,2002,2003,2004,2005,2006,2007  Josh Coalson
Chris@34:  *
Chris@34:  * Redistribution and use in source and binary forms, with or without
Chris@34:  * modification, are permitted provided that the following conditions
Chris@34:  * are met:
Chris@34:  *
Chris@34:  * - Redistributions of source code must retain the above copyright
Chris@34:  * notice, this list of conditions and the following disclaimer.
Chris@34:  *
Chris@34:  * - Redistributions in binary form must reproduce the above copyright
Chris@34:  * notice, this list of conditions and the following disclaimer in the
Chris@34:  * documentation and/or other materials provided with the distribution.
Chris@34:  *
Chris@34:  * - Neither the name of the Xiph.org Foundation nor the names of its
Chris@34:  * contributors may be used to endorse or promote products derived from
Chris@34:  * this software without specific prior written permission.
Chris@34:  *
Chris@34:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
Chris@34:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
Chris@34:  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
Chris@34:  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
Chris@34:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Chris@34:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
Chris@34:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
Chris@34:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
Chris@34:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
Chris@34:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
Chris@34:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Chris@34:  */
Chris@34: 
Chris@34: #ifndef FLAC__METADATA_H
Chris@34: #define FLAC__METADATA_H
Chris@34: 
Chris@34: #include <sys/types.h> /* for off_t */
Chris@34: #include "export.h"
Chris@34: #include "callback.h"
Chris@34: #include "format.h"
Chris@34: 
Chris@34: /* --------------------------------------------------------------------
Chris@34:    (For an example of how all these routines are used, see the source
Chris@34:    code for the unit tests in src/test_libFLAC/metadata_*.c, or
Chris@34:    metaflac in src/metaflac/)
Chris@34:    ------------------------------------------------------------------*/
Chris@34: 
Chris@34: /** \file include/FLAC/metadata.h
Chris@34:  *
Chris@34:  *  \brief
Chris@34:  *  This module provides functions for creating and manipulating FLAC
Chris@34:  *  metadata blocks in memory, and three progressively more powerful
Chris@34:  *  interfaces for traversing and editing metadata in FLAC files.
Chris@34:  *
Chris@34:  *  See the detailed documentation for each interface in the
Chris@34:  *  \link flac_metadata metadata \endlink module.
Chris@34:  */
Chris@34: 
Chris@34: /** \defgroup flac_metadata FLAC/metadata.h: metadata interfaces
Chris@34:  *  \ingroup flac
Chris@34:  *
Chris@34:  *  \brief
Chris@34:  *  This module provides functions for creating and manipulating FLAC
Chris@34:  *  metadata blocks in memory, and three progressively more powerful
Chris@34:  *  interfaces for traversing and editing metadata in native FLAC files.
Chris@34:  *  Note that currently only the Chain interface (level 2) supports Ogg
Chris@34:  *  FLAC files, and it is read-only i.e. no writing back changed
Chris@34:  *  metadata to file.
Chris@34:  *
Chris@34:  *  There are three metadata interfaces of increasing complexity:
Chris@34:  *
Chris@34:  *  Level 0:
Chris@34:  *  Read-only access to the STREAMINFO, VORBIS_COMMENT, CUESHEET, and
Chris@34:  *  PICTURE blocks.
Chris@34:  *
Chris@34:  *  Level 1:
Chris@34:  *  Read-write access to all metadata blocks.  This level is write-
Chris@34:  *  efficient in most cases (more on this below), and uses less memory
Chris@34:  *  than level 2.
Chris@34:  *
Chris@34:  *  Level 2:
Chris@34:  *  Read-write access to all metadata blocks.  This level is write-
Chris@34:  *  efficient in all cases, but uses more memory since all metadata for
Chris@34:  *  the whole file is read into memory and manipulated before writing
Chris@34:  *  out again.
Chris@34:  *
Chris@34:  *  What do we mean by efficient?  Since FLAC metadata appears at the
Chris@34:  *  beginning of the file, when writing metadata back to a FLAC file
Chris@34:  *  it is possible to grow or shrink the metadata such that the entire
Chris@34:  *  file must be rewritten.  However, if the size remains the same during
Chris@34:  *  changes or PADDING blocks are utilized, only the metadata needs to be
Chris@34:  *  overwritten, which is much faster.
Chris@34:  *
Chris@34:  *  Efficient means the whole file is rewritten at most one time, and only
Chris@34:  *  when necessary.  Level 1 is not efficient only in the case that you
Chris@34:  *  cause more than one metadata block to grow or shrink beyond what can
Chris@34:  *  be accomodated by padding.  In this case you should probably use level
Chris@34:  *  2, which allows you to edit all the metadata for a file in memory and
Chris@34:  *  write it out all at once.
Chris@34:  *
Chris@34:  *  All levels know how to skip over and not disturb an ID3v2 tag at the
Chris@34:  *  front of the file.
Chris@34:  *
Chris@34:  *  All levels access files via their filenames.  In addition, level 2
Chris@34:  *  has additional alternative read and write functions that take an I/O
Chris@34:  *  handle and callbacks, for situations where access by filename is not
Chris@34:  *  possible.
Chris@34:  *
Chris@34:  *  In addition to the three interfaces, this module defines functions for
Chris@34:  *  creating and manipulating various metadata objects in memory.  As we see
Chris@34:  *  from the Format module, FLAC metadata blocks in memory are very primitive
Chris@34:  *  structures for storing information in an efficient way.  Reading
Chris@34:  *  information from the structures is easy but creating or modifying them
Chris@34:  *  directly is more complex.  The metadata object routines here facilitate
Chris@34:  *  this by taking care of the consistency and memory management drudgery.
Chris@34:  *
Chris@34:  *  Unless you will be using the level 1 or 2 interfaces to modify existing
Chris@34:  *  metadata however, you will not probably not need these.
Chris@34:  *
Chris@34:  *  From a dependency standpoint, none of the encoders or decoders require
Chris@34:  *  the metadata module.  This is so that embedded users can strip out the
Chris@34:  *  metadata module from libFLAC to reduce the size and complexity.
Chris@34:  */
Chris@34: 
Chris@34: #ifdef __cplusplus
Chris@34: extern "C" {
Chris@34: #endif
Chris@34: 
Chris@34: 
Chris@34: /** \defgroup flac_metadata_level0 FLAC/metadata.h: metadata level 0 interface
Chris@34:  *  \ingroup flac_metadata
Chris@34:  *
Chris@34:  *  \brief
Chris@34:  *  The level 0 interface consists of individual routines to read the
Chris@34:  *  STREAMINFO, VORBIS_COMMENT, CUESHEET, and PICTURE blocks, requiring
Chris@34:  *  only a filename.
Chris@34:  *
Chris@34:  *  They try to skip any ID3v2 tag at the head of the file.
Chris@34:  *
Chris@34:  * \{
Chris@34:  */
Chris@34: 
Chris@34: /** Read the STREAMINFO metadata block of the given FLAC file.  This function
Chris@34:  *  will try to skip any ID3v2 tag at the head of the file.
Chris@34:  *
Chris@34:  * \param filename    The path to the FLAC file to read.
Chris@34:  * \param streaminfo  A pointer to space for the STREAMINFO block.  Since
Chris@34:  *                    FLAC__StreamMetadata is a simple structure with no
Chris@34:  *                    memory allocation involved, you pass the address of
Chris@34:  *                    an existing structure.  It need not be initialized.
Chris@34:  * \assert
Chris@34:  *    \code filename != NULL \endcode
Chris@34:  *    \code streaminfo != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid STREAMINFO block was read from \a filename.  Returns
Chris@34:  *    \c false if there was a memory allocation error, a file decoder error,
Chris@34:  *    or the file contained no STREAMINFO block.  (A memory allocation error
Chris@34:  *    is possible because this function must set up a file decoder.)
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_get_streaminfo(const char *filename, FLAC__StreamMetadata *streaminfo);
Chris@34: 
Chris@34: /** Read the VORBIS_COMMENT metadata block of the given FLAC file.  This
Chris@34:  *  function will try to skip any ID3v2 tag at the head of the file.
Chris@34:  *
Chris@34:  * \param filename    The path to the FLAC file to read.
Chris@34:  * \param tags        The address where the returned pointer will be
Chris@34:  *                    stored.  The \a tags object must be deleted by
Chris@34:  *                    the caller using FLAC__metadata_object_delete().
Chris@34:  * \assert
Chris@34:  *    \code filename != NULL \endcode
Chris@34:  *    \code tags != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid VORBIS_COMMENT block was read from \a filename,
Chris@34:  *    and \a *tags will be set to the address of the metadata structure.
Chris@34:  *    Returns \c false if there was a memory allocation error, a file
Chris@34:  *    decoder error, or the file contained no VORBIS_COMMENT block, and
Chris@34:  *    \a *tags will be set to \c NULL.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_get_tags(const char *filename, FLAC__StreamMetadata **tags);
Chris@34: 
Chris@34: /** Read the CUESHEET metadata block of the given FLAC file.  This
Chris@34:  *  function will try to skip any ID3v2 tag at the head of the file.
Chris@34:  *
Chris@34:  * \param filename    The path to the FLAC file to read.
Chris@34:  * \param cuesheet    The address where the returned pointer will be
Chris@34:  *                    stored.  The \a cuesheet object must be deleted by
Chris@34:  *                    the caller using FLAC__metadata_object_delete().
Chris@34:  * \assert
Chris@34:  *    \code filename != NULL \endcode
Chris@34:  *    \code cuesheet != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid CUESHEET block was read from \a filename,
Chris@34:  *    and \a *cuesheet will be set to the address of the metadata
Chris@34:  *    structure.  Returns \c false if there was a memory allocation
Chris@34:  *    error, a file decoder error, or the file contained no CUESHEET
Chris@34:  *    block, and \a *cuesheet will be set to \c NULL.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_get_cuesheet(const char *filename, FLAC__StreamMetadata **cuesheet);
Chris@34: 
Chris@34: /** Read a PICTURE metadata block of the given FLAC file.  This
Chris@34:  *  function will try to skip any ID3v2 tag at the head of the file.
Chris@34:  *  Since there can be more than one PICTURE block in a file, this
Chris@34:  *  function takes a number of parameters that act as constraints to
Chris@34:  *  the search.  The PICTURE block with the largest area matching all
Chris@34:  *  the constraints will be returned, or \a *picture will be set to
Chris@34:  *  \c NULL if there was no such block.
Chris@34:  *
Chris@34:  * \param filename    The path to the FLAC file to read.
Chris@34:  * \param picture     The address where the returned pointer will be
Chris@34:  *                    stored.  The \a picture object must be deleted by
Chris@34:  *                    the caller using FLAC__metadata_object_delete().
Chris@34:  * \param type        The desired picture type.  Use \c -1 to mean
Chris@34:  *                    "any type".
Chris@34:  * \param mime_type   The desired MIME type, e.g. "image/jpeg".  The
Chris@34:  *                    string will be matched exactly.  Use \c NULL to
Chris@34:  *                    mean "any MIME type".
Chris@34:  * \param description The desired description.  The string will be
Chris@34:  *                    matched exactly.  Use \c NULL to mean "any
Chris@34:  *                    description".
Chris@34:  * \param max_width   The maximum width in pixels desired.  Use
Chris@34:  *                    \c (unsigned)(-1) to mean "any width".
Chris@34:  * \param max_height  The maximum height in pixels desired.  Use
Chris@34:  *                    \c (unsigned)(-1) to mean "any height".
Chris@34:  * \param max_depth   The maximum color depth in bits-per-pixel desired.
Chris@34:  *                    Use \c (unsigned)(-1) to mean "any depth".
Chris@34:  * \param max_colors  The maximum number of colors desired.  Use
Chris@34:  *                    \c (unsigned)(-1) to mean "any number of colors".
Chris@34:  * \assert
Chris@34:  *    \code filename != NULL \endcode
Chris@34:  *    \code picture != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid PICTURE block was read from \a filename,
Chris@34:  *    and \a *picture will be set to the address of the metadata
Chris@34:  *    structure.  Returns \c false if there was a memory allocation
Chris@34:  *    error, a file decoder error, or the file contained no PICTURE
Chris@34:  *    block, and \a *picture will be set to \c NULL.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_get_picture(const char *filename, FLAC__StreamMetadata **picture, FLAC__StreamMetadata_Picture_Type type, const char *mime_type, const FLAC__byte *description, unsigned max_width, unsigned max_height, unsigned max_depth, unsigned max_colors);
Chris@34: 
Chris@34: /* \} */
Chris@34: 
Chris@34: 
Chris@34: /** \defgroup flac_metadata_level1 FLAC/metadata.h: metadata level 1 interface
Chris@34:  *  \ingroup flac_metadata
Chris@34:  *
Chris@34:  * \brief
Chris@34:  * The level 1 interface provides read-write access to FLAC file metadata and
Chris@34:  * operates directly on the FLAC file.
Chris@34:  *
Chris@34:  * The general usage of this interface is:
Chris@34:  *
Chris@34:  * - Create an iterator using FLAC__metadata_simple_iterator_new()
Chris@34:  * - Attach it to a file using FLAC__metadata_simple_iterator_init() and check
Chris@34:  *   the exit code.  Call FLAC__metadata_simple_iterator_is_writable() to
Chris@34:  *   see if the file is writable, or only read access is allowed.
Chris@34:  * - Use FLAC__metadata_simple_iterator_next() and
Chris@34:  *   FLAC__metadata_simple_iterator_prev() to traverse the blocks.
Chris@34:  *   This is does not read the actual blocks themselves.
Chris@34:  *   FLAC__metadata_simple_iterator_next() is relatively fast.
Chris@34:  *   FLAC__metadata_simple_iterator_prev() is slower since it needs to search
Chris@34:  *   forward from the front of the file.
Chris@34:  * - Use FLAC__metadata_simple_iterator_get_block_type() or
Chris@34:  *   FLAC__metadata_simple_iterator_get_block() to access the actual data at
Chris@34:  *   the current iterator position.  The returned object is yours to modify
Chris@34:  *   and free.
Chris@34:  * - Use FLAC__metadata_simple_iterator_set_block() to write a modified block
Chris@34:  *   back.  You must have write permission to the original file.  Make sure to
Chris@34:  *   read the whole comment to FLAC__metadata_simple_iterator_set_block()
Chris@34:  *   below.
Chris@34:  * - Use FLAC__metadata_simple_iterator_insert_block_after() to add new blocks.
Chris@34:  *   Use the object creation functions from
Chris@34:  *   \link flac_metadata_object here \endlink to generate new objects.
Chris@34:  * - Use FLAC__metadata_simple_iterator_delete_block() to remove the block
Chris@34:  *   currently referred to by the iterator, or replace it with padding.
Chris@34:  * - Destroy the iterator with FLAC__metadata_simple_iterator_delete() when
Chris@34:  *   finished.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * The FLAC file remains open the whole time between
Chris@34:  * FLAC__metadata_simple_iterator_init() and
Chris@34:  * FLAC__metadata_simple_iterator_delete(), so make sure you are not altering
Chris@34:  * the file during this time.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * Do not modify the \a is_last, \a length, or \a type fields of returned
Chris@34:  * FLAC__StreamMetadata objects.  These are managed automatically.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * If any of the modification functions
Chris@34:  * (FLAC__metadata_simple_iterator_set_block(),
Chris@34:  * FLAC__metadata_simple_iterator_delete_block(),
Chris@34:  * FLAC__metadata_simple_iterator_insert_block_after(), etc.) return \c false,
Chris@34:  * you should delete the iterator as it may no longer be valid.
Chris@34:  *
Chris@34:  * \{
Chris@34:  */
Chris@34: 
Chris@34: struct FLAC__Metadata_SimpleIterator;
Chris@34: /** The opaque structure definition for the level 1 iterator type.
Chris@34:  *  See the
Chris@34:  *  \link flac_metadata_level1 metadata level 1 module \endlink
Chris@34:  *  for a detailed description.
Chris@34:  */
Chris@34: typedef struct FLAC__Metadata_SimpleIterator FLAC__Metadata_SimpleIterator;
Chris@34: 
Chris@34: /** Status type for FLAC__Metadata_SimpleIterator.
Chris@34:  *
Chris@34:  *  The iterator's current status can be obtained by calling FLAC__metadata_simple_iterator_status().
Chris@34:  */
Chris@34: typedef enum {
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK = 0,
Chris@34: 	/**< The iterator is in the normal OK state */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT,
Chris@34: 	/**< The data passed into a function violated the function's usage criteria */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ERROR_OPENING_FILE,
Chris@34: 	/**< The iterator could not open the target file */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_A_FLAC_FILE,
Chris@34: 	/**< The iterator could not find the FLAC signature at the start of the file */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_NOT_WRITABLE,
Chris@34: 	/**< The iterator tried to write to a file that was not writable */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_BAD_METADATA,
Chris@34: 	/**< The iterator encountered input that does not conform to the FLAC metadata specification */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR,
Chris@34: 	/**< The iterator encountered an error while reading the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR,
Chris@34: 	/**< The iterator encountered an error while seeking in the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_WRITE_ERROR,
Chris@34: 	/**< The iterator encountered an error while writing the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_RENAME_ERROR,
Chris@34: 	/**< The iterator encountered an error renaming the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_UNLINK_ERROR,
Chris@34: 	/**< The iterator encountered an error removing the temporary file */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_MEMORY_ALLOCATION_ERROR,
Chris@34: 	/**< Memory allocation failed */
Chris@34: 
Chris@34: 	FLAC__METADATA_SIMPLE_ITERATOR_STATUS_INTERNAL_ERROR
Chris@34: 	/**< The caller violated an assertion or an unexpected error occurred */
Chris@34: 
Chris@34: } FLAC__Metadata_SimpleIteratorStatus;
Chris@34: 
Chris@34: /** Maps a FLAC__Metadata_SimpleIteratorStatus to a C string.
Chris@34:  *
Chris@34:  *  Using a FLAC__Metadata_SimpleIteratorStatus as the index to this array
Chris@34:  *  will give the string equivalent.  The contents should not be modified.
Chris@34:  */
Chris@34: extern FLAC_API const char * const FLAC__Metadata_SimpleIteratorStatusString[];
Chris@34: 
Chris@34: 
Chris@34: /** Create a new iterator instance.
Chris@34:  *
Chris@34:  * \retval FLAC__Metadata_SimpleIterator*
Chris@34:  *    \c NULL if there was an error allocating memory, else the new instance.
Chris@34:  */
Chris@34: FLAC_API FLAC__Metadata_SimpleIterator *FLAC__metadata_simple_iterator_new(void);
Chris@34: 
Chris@34: /** Free an iterator instance.  Deletes the object pointed to by \a iterator.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_simple_iterator_delete(FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Get the current status of the iterator.  Call this after a function
Chris@34:  *  returns \c false to get the reason for the error.  Also resets the status
Chris@34:  *  to FLAC__METADATA_SIMPLE_ITERATOR_STATUS_OK.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  * \retval FLAC__Metadata_SimpleIteratorStatus
Chris@34:  *    The current status of the iterator.
Chris@34:  */
Chris@34: FLAC_API FLAC__Metadata_SimpleIteratorStatus FLAC__metadata_simple_iterator_status(FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Initialize the iterator to point to the first metadata block in the
Chris@34:  *  given FLAC file.
Chris@34:  *
Chris@34:  * \param iterator             A pointer to an existing iterator.
Chris@34:  * \param filename             The path to the FLAC file.
Chris@34:  * \param read_only            If \c true, the FLAC file will be opened
Chris@34:  *                             in read-only mode; if \c false, the FLAC
Chris@34:  *                             file will be opened for edit even if no
Chris@34:  *                             edits are performed.
Chris@34:  * \param preserve_file_stats  If \c true, the owner and modification
Chris@34:  *                             time will be preserved even if the FLAC
Chris@34:  *                             file is written to.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \code filename != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if a memory allocation error occurs, the file can't be
Chris@34:  *    opened, or another error occurs, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_init(FLAC__Metadata_SimpleIterator *iterator, const char *filename, FLAC__bool read_only, FLAC__bool preserve_file_stats);
Chris@34: 
Chris@34: /** Returns \c true if the FLAC file is writable.  If \c false, calls to
Chris@34:  *  FLAC__metadata_simple_iterator_set_block() and
Chris@34:  *  FLAC__metadata_simple_iterator_insert_block_after() will fail.
Chris@34:  *
Chris@34:  * \param iterator             A pointer to an existing iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    See above.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_writable(const FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Moves the iterator forward one metadata block, returning \c false if
Chris@34:  *  already at the end.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if already at the last metadata block of the chain, else
Chris@34:  *    \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_next(FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Moves the iterator backward one metadata block, returning \c false if
Chris@34:  *  already at the beginning.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if already at the first metadata block of the chain, else
Chris@34:  *    \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_prev(FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Returns a flag telling if the current metadata block is the last.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if the current metadata block is the last in the file,
Chris@34:  *    else \c false.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_is_last(const FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Get the offset of the metadata block at the current position.  This
Chris@34:  *  avoids reading the actual block data which can save time for large
Chris@34:  *  blocks.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval off_t
Chris@34:  *    The offset of the metadata block at the current iterator position.
Chris@34:  *    This is the byte offset relative to the beginning of the file of
Chris@34:  *    the current metadata block's header.
Chris@34:  */
Chris@34: FLAC_API off_t FLAC__metadata_simple_iterator_get_block_offset(const FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Get the type of the metadata block at the current position.  This
Chris@34:  *  avoids reading the actual block data which can save time for large
Chris@34:  *  blocks.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval FLAC__MetadataType
Chris@34:  *    The type of the metadata block at the current iterator position.
Chris@34:  */
Chris@34: FLAC_API FLAC__MetadataType FLAC__metadata_simple_iterator_get_block_type(const FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Get the length of the metadata block at the current position.  This
Chris@34:  *  avoids reading the actual block data which can save time for large
Chris@34:  *  blocks.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval unsigned
Chris@34:  *    The length of the metadata block at the current iterator position.
Chris@34:  *    The is same length as that in the
Chris@34:  *    <a href="http://flac.sourceforge.net/format.html#metadata_block_header">metadata block header</a>,
Chris@34:  *    i.e. the length of the metadata body that follows the header.
Chris@34:  */
Chris@34: FLAC_API unsigned FLAC__metadata_simple_iterator_get_block_length(const FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Get the application ID of the \c APPLICATION block at the current
Chris@34:  *  position.  This avoids reading the actual block data which can save
Chris@34:  *  time for large blocks.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \param id        A pointer to a buffer of at least \c 4 bytes where
Chris@34:  *                  the ID will be stored.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \code id != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if the ID was successfully read, else \c false, in which
Chris@34:  *    case you should check FLAC__metadata_simple_iterator_status() to
Chris@34:  *    find out why.  If the status is
Chris@34:  *    \c FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT, then the
Chris@34:  *    current metadata block is not an \c APPLICATION block.  Otherwise
Chris@34:  *    if the status is
Chris@34:  *    \c FLAC__METADATA_SIMPLE_ITERATOR_STATUS_READ_ERROR or
Chris@34:  *    \c FLAC__METADATA_SIMPLE_ITERATOR_STATUS_SEEK_ERROR, an I/O error
Chris@34:  *    occurred and the iterator can no longer be used.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_get_application_id(FLAC__Metadata_SimpleIterator *iterator, FLAC__byte *id);
Chris@34: 
Chris@34: /** Get the metadata block at the current position.  You can modify the
Chris@34:  *  block but must use FLAC__metadata_simple_iterator_set_block() to
Chris@34:  *  write it back to the FLAC file.
Chris@34:  *
Chris@34:  *  You must call FLAC__metadata_object_delete() on the returned object
Chris@34:  *  when you are finished with it.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval FLAC__StreamMetadata*
Chris@34:  *    The current metadata block, or \c NULL if there was a memory
Chris@34:  *    allocation error.
Chris@34:  */
Chris@34: FLAC_API FLAC__StreamMetadata *FLAC__metadata_simple_iterator_get_block(FLAC__Metadata_SimpleIterator *iterator);
Chris@34: 
Chris@34: /** Write a block back to the FLAC file.  This function tries to be
Chris@34:  *  as efficient as possible; how the block is actually written is
Chris@34:  *  shown by the following:
Chris@34:  *
Chris@34:  *  Existing block is a STREAMINFO block and the new block is a
Chris@34:  *  STREAMINFO block: the new block is written in place.  Make sure
Chris@34:  *  you know what you're doing when changing the values of a
Chris@34:  *  STREAMINFO block.
Chris@34:  *
Chris@34:  *  Existing block is a STREAMINFO block and the new block is a
Chris@34:  *  not a STREAMINFO block: this is an error since the first block
Chris@34:  *  must be a STREAMINFO block.  Returns \c false without altering the
Chris@34:  *  file.
Chris@34:  *
Chris@34:  *  Existing block is not a STREAMINFO block and the new block is a
Chris@34:  *  STREAMINFO block: this is an error since there may be only one
Chris@34:  *  STREAMINFO block.  Returns \c false without altering the file.
Chris@34:  *
Chris@34:  *  Existing block and new block are the same length: the existing
Chris@34:  *  block will be replaced by the new block, written in place.
Chris@34:  *
Chris@34:  *  Existing block is longer than new block: if use_padding is \c true,
Chris@34:  *  the existing block will be overwritten in place with the new
Chris@34:  *  block followed by a PADDING block, if possible, to make the total
Chris@34:  *  size the same as the existing block.  Remember that a padding
Chris@34:  *  block requires at least four bytes so if the difference in size
Chris@34:  *  between the new block and existing block is less than that, the
Chris@34:  *  entire file will have to be rewritten, using the new block's
Chris@34:  *  exact size.  If use_padding is \c false, the entire file will be
Chris@34:  *  rewritten, replacing the existing block by the new block.
Chris@34:  *
Chris@34:  *  Existing block is shorter than new block: if use_padding is \c true,
Chris@34:  *  the function will try and expand the new block into the following
Chris@34:  *  PADDING block, if it exists and doing so won't shrink the PADDING
Chris@34:  *  block to less than 4 bytes.  If there is no following PADDING
Chris@34:  *  block, or it will shrink to less than 4 bytes, or use_padding is
Chris@34:  *  \c false, the entire file is rewritten, replacing the existing block
Chris@34:  *  with the new block.  Note that in this case any following PADDING
Chris@34:  *  block is preserved as is.
Chris@34:  *
Chris@34:  *  After writing the block, the iterator will remain in the same
Chris@34:  *  place, i.e. pointing to the new block.
Chris@34:  *
Chris@34:  * \param iterator     A pointer to an existing initialized iterator.
Chris@34:  * \param block        The block to set.
Chris@34:  * \param use_padding  See above.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  *    \code block != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if successful, else \c false.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_set_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding);
Chris@34: 
Chris@34: /** This is similar to FLAC__metadata_simple_iterator_set_block()
Chris@34:  *  except that instead of writing over an existing block, it appends
Chris@34:  *  a block after the existing block.  \a use_padding is again used to
Chris@34:  *  tell the function to try an expand into following padding in an
Chris@34:  *  attempt to avoid rewriting the entire file.
Chris@34:  *
Chris@34:  *  This function will fail and return \c false if given a STREAMINFO
Chris@34:  *  block.
Chris@34:  *
Chris@34:  *  After writing the block, the iterator will be pointing to the
Chris@34:  *  new block.
Chris@34:  *
Chris@34:  * \param iterator     A pointer to an existing initialized iterator.
Chris@34:  * \param block        The block to set.
Chris@34:  * \param use_padding  See above.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  *    \code block != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if successful, else \c false.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_insert_block_after(FLAC__Metadata_SimpleIterator *iterator, FLAC__StreamMetadata *block, FLAC__bool use_padding);
Chris@34: 
Chris@34: /** Deletes the block at the current position.  This will cause the
Chris@34:  *  entire FLAC file to be rewritten, unless \a use_padding is \c true,
Chris@34:  *  in which case the block will be replaced by an equal-sized PADDING
Chris@34:  *  block.  The iterator will be left pointing to the block before the
Chris@34:  *  one just deleted.
Chris@34:  *
Chris@34:  *  You may not delete the STREAMINFO block.
Chris@34:  *
Chris@34:  * \param iterator     A pointer to an existing initialized iterator.
Chris@34:  * \param use_padding  See above.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_simple_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if successful, else \c false.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_simple_iterator_delete_block(FLAC__Metadata_SimpleIterator *iterator, FLAC__bool use_padding);
Chris@34: 
Chris@34: /* \} */
Chris@34: 
Chris@34: 
Chris@34: /** \defgroup flac_metadata_level2 FLAC/metadata.h: metadata level 2 interface
Chris@34:  *  \ingroup flac_metadata
Chris@34:  *
Chris@34:  * \brief
Chris@34:  * The level 2 interface provides read-write access to FLAC file metadata;
Chris@34:  * all metadata is read into memory, operated on in memory, and then written
Chris@34:  * to file, which is more efficient than level 1 when editing multiple blocks.
Chris@34:  *
Chris@34:  * Currently Ogg FLAC is supported for read only, via
Chris@34:  * FLAC__metadata_chain_read_ogg() but a subsequent
Chris@34:  * FLAC__metadata_chain_write() will fail.
Chris@34:  *
Chris@34:  * The general usage of this interface is:
Chris@34:  *
Chris@34:  * - Create a new chain using FLAC__metadata_chain_new().  A chain is a
Chris@34:  *   linked list of FLAC metadata blocks.
Chris@34:  * - Read all metadata into the the chain from a FLAC file using
Chris@34:  *   FLAC__metadata_chain_read() or FLAC__metadata_chain_read_ogg() and
Chris@34:  *   check the status.
Chris@34:  * - Optionally, consolidate the padding using
Chris@34:  *   FLAC__metadata_chain_merge_padding() or
Chris@34:  *   FLAC__metadata_chain_sort_padding().
Chris@34:  * - Create a new iterator using FLAC__metadata_iterator_new()
Chris@34:  * - Initialize the iterator to point to the first element in the chain
Chris@34:  *   using FLAC__metadata_iterator_init()
Chris@34:  * - Traverse the chain using FLAC__metadata_iterator_next and
Chris@34:  *   FLAC__metadata_iterator_prev().
Chris@34:  * - Get a block for reading or modification using
Chris@34:  *   FLAC__metadata_iterator_get_block().  The pointer to the object
Chris@34:  *   inside the chain is returned, so the block is yours to modify.
Chris@34:  *   Changes will be reflected in the FLAC file when you write the
Chris@34:  *   chain.  You can also add and delete blocks (see functions below).
Chris@34:  * - When done, write out the chain using FLAC__metadata_chain_write().
Chris@34:  *   Make sure to read the whole comment to the function below.
Chris@34:  * - Delete the chain using FLAC__metadata_chain_delete().
Chris@34:  *
Chris@34:  * \note
Chris@34:  * Even though the FLAC file is not open while the chain is being
Chris@34:  * manipulated, you must not alter the file externally during
Chris@34:  * this time.  The chain assumes the FLAC file will not change
Chris@34:  * between the time of FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg()
Chris@34:  * and FLAC__metadata_chain_write().
Chris@34:  *
Chris@34:  * \note
Chris@34:  * Do not modify the is_last, length, or type fields of returned
Chris@34:  * FLAC__StreamMetadata objects.  These are managed automatically.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * The metadata objects returned by FLAC__metadata_iterator_get_block()
Chris@34:  * are owned by the chain; do not FLAC__metadata_object_delete() them.
Chris@34:  * In the same way, blocks passed to FLAC__metadata_iterator_set_block()
Chris@34:  * become owned by the chain and they will be deleted when the chain is
Chris@34:  * deleted.
Chris@34:  *
Chris@34:  * \{
Chris@34:  */
Chris@34: 
Chris@34: struct FLAC__Metadata_Chain;
Chris@34: /** The opaque structure definition for the level 2 chain type.
Chris@34:  */
Chris@34: typedef struct FLAC__Metadata_Chain FLAC__Metadata_Chain;
Chris@34: 
Chris@34: struct FLAC__Metadata_Iterator;
Chris@34: /** The opaque structure definition for the level 2 iterator type.
Chris@34:  */
Chris@34: typedef struct FLAC__Metadata_Iterator FLAC__Metadata_Iterator;
Chris@34: 
Chris@34: typedef enum {
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_OK = 0,
Chris@34: 	/**< The chain is in the normal OK state */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_ILLEGAL_INPUT,
Chris@34: 	/**< The data passed into a function violated the function's usage criteria */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_ERROR_OPENING_FILE,
Chris@34: 	/**< The chain could not open the target file */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_NOT_A_FLAC_FILE,
Chris@34: 	/**< The chain could not find the FLAC signature at the start of the file */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_NOT_WRITABLE,
Chris@34: 	/**< The chain tried to write to a file that was not writable */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_BAD_METADATA,
Chris@34: 	/**< The chain encountered input that does not conform to the FLAC metadata specification */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_READ_ERROR,
Chris@34: 	/**< The chain encountered an error while reading the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_SEEK_ERROR,
Chris@34: 	/**< The chain encountered an error while seeking in the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_WRITE_ERROR,
Chris@34: 	/**< The chain encountered an error while writing the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_RENAME_ERROR,
Chris@34: 	/**< The chain encountered an error renaming the FLAC file */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_UNLINK_ERROR,
Chris@34: 	/**< The chain encountered an error removing the temporary file */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR,
Chris@34: 	/**< Memory allocation failed */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_INTERNAL_ERROR,
Chris@34: 	/**< The caller violated an assertion or an unexpected error occurred */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_INVALID_CALLBACKS,
Chris@34: 	/**< One or more of the required callbacks was NULL */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH,
Chris@34: 	/**< FLAC__metadata_chain_write() was called on a chain read by
Chris@34: 	 *   FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks(),
Chris@34: 	 *   or 
Chris@34: 	 *   FLAC__metadata_chain_write_with_callbacks()/FLAC__metadata_chain_write_with_callbacks_and_tempfile()
Chris@34: 	 *   was called on a chain read by
Chris@34: 	 *   FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg().
Chris@34: 	 *   Matching read/write methods must always be used. */
Chris@34: 
Chris@34: 	FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL
Chris@34: 	/**< FLAC__metadata_chain_write_with_callbacks() was called when the
Chris@34: 	 *   chain write requires a tempfile; use
Chris@34: 	 *   FLAC__metadata_chain_write_with_callbacks_and_tempfile() instead.
Chris@34: 	 *   Or, FLAC__metadata_chain_write_with_callbacks_and_tempfile() was
Chris@34: 	 *   called when the chain write does not require a tempfile; use
Chris@34: 	 *   FLAC__metadata_chain_write_with_callbacks() instead.
Chris@34: 	 *   Always check FLAC__metadata_chain_check_if_tempfile_needed()
Chris@34: 	 *   before writing via callbacks. */
Chris@34: 
Chris@34: } FLAC__Metadata_ChainStatus;
Chris@34: 
Chris@34: /** Maps a FLAC__Metadata_ChainStatus to a C string.
Chris@34:  *
Chris@34:  *  Using a FLAC__Metadata_ChainStatus as the index to this array
Chris@34:  *  will give the string equivalent.  The contents should not be modified.
Chris@34:  */
Chris@34: extern FLAC_API const char * const FLAC__Metadata_ChainStatusString[];
Chris@34: 
Chris@34: /*********** FLAC__Metadata_Chain ***********/
Chris@34: 
Chris@34: /** Create a new chain instance.
Chris@34:  *
Chris@34:  * \retval FLAC__Metadata_Chain*
Chris@34:  *    \c NULL if there was an error allocating memory, else the new instance.
Chris@34:  */
Chris@34: FLAC_API FLAC__Metadata_Chain *FLAC__metadata_chain_new(void);
Chris@34: 
Chris@34: /** Free a chain instance.  Deletes the object pointed to by \a chain.
Chris@34:  *
Chris@34:  * \param chain  A pointer to an existing chain.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_chain_delete(FLAC__Metadata_Chain *chain);
Chris@34: 
Chris@34: /** Get the current status of the chain.  Call this after a function
Chris@34:  *  returns \c false to get the reason for the error.  Also resets the
Chris@34:  *  status to FLAC__METADATA_CHAIN_STATUS_OK.
Chris@34:  *
Chris@34:  * \param chain    A pointer to an existing chain.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  * \retval FLAC__Metadata_ChainStatus
Chris@34:  *    The current status of the chain.
Chris@34:  */
Chris@34: FLAC_API FLAC__Metadata_ChainStatus FLAC__metadata_chain_status(FLAC__Metadata_Chain *chain);
Chris@34: 
Chris@34: /** Read all metadata from a FLAC file into the chain.
Chris@34:  *
Chris@34:  * \param chain    A pointer to an existing chain.
Chris@34:  * \param filename The path to the FLAC file to read.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  *    \code filename != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid list of metadata blocks was read from
Chris@34:  *    \a filename, else \c false.  On failure, check the status with
Chris@34:  *    FLAC__metadata_chain_status().
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *filename);
Chris@34: 
Chris@34: /** Read all metadata from an Ogg FLAC file into the chain.
Chris@34:  *
Chris@34:  * \note Ogg FLAC metadata data writing is not supported yet and
Chris@34:  * FLAC__metadata_chain_write() will fail.
Chris@34:  *
Chris@34:  * \param chain    A pointer to an existing chain.
Chris@34:  * \param filename The path to the Ogg FLAC file to read.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  *    \code filename != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid list of metadata blocks was read from
Chris@34:  *    \a filename, else \c false.  On failure, check the status with
Chris@34:  *    FLAC__metadata_chain_status().
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg(FLAC__Metadata_Chain *chain, const char *filename);
Chris@34: 
Chris@34: /** Read all metadata from a FLAC stream into the chain via I/O callbacks.
Chris@34:  *
Chris@34:  *  The \a handle need only be open for reading, but must be seekable.
Chris@34:  *  The equivalent minimum stdio fopen() file mode is \c "r" (or \c "rb"
Chris@34:  *  for Windows).
Chris@34:  *
Chris@34:  * \param chain    A pointer to an existing chain.
Chris@34:  * \param handle   The I/O handle of the FLAC stream to read.  The
Chris@34:  *                 handle will NOT be closed after the metadata is read;
Chris@34:  *                 that is the duty of the caller.
Chris@34:  * \param callbacks
Chris@34:  *                 A set of callbacks to use for I/O.  The mandatory
Chris@34:  *                 callbacks are \a read, \a seek, and \a tell.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid list of metadata blocks was read from
Chris@34:  *    \a handle, else \c false.  On failure, check the status with
Chris@34:  *    FLAC__metadata_chain_status().
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_read_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks);
Chris@34: 
Chris@34: /** Read all metadata from an Ogg FLAC stream into the chain via I/O callbacks.
Chris@34:  *
Chris@34:  *  The \a handle need only be open for reading, but must be seekable.
Chris@34:  *  The equivalent minimum stdio fopen() file mode is \c "r" (or \c "rb"
Chris@34:  *  for Windows).
Chris@34:  *
Chris@34:  * \note Ogg FLAC metadata data writing is not supported yet and
Chris@34:  * FLAC__metadata_chain_write() will fail.
Chris@34:  *
Chris@34:  * \param chain    A pointer to an existing chain.
Chris@34:  * \param handle   The I/O handle of the Ogg FLAC stream to read.  The
Chris@34:  *                 handle will NOT be closed after the metadata is read;
Chris@34:  *                 that is the duty of the caller.
Chris@34:  * \param callbacks
Chris@34:  *                 A set of callbacks to use for I/O.  The mandatory
Chris@34:  *                 callbacks are \a read, \a seek, and \a tell.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if a valid list of metadata blocks was read from
Chris@34:  *    \a handle, else \c false.  On failure, check the status with
Chris@34:  *    FLAC__metadata_chain_status().
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_read_ogg_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks);
Chris@34: 
Chris@34: /** Checks if writing the given chain would require the use of a
Chris@34:  *  temporary file, or if it could be written in place.
Chris@34:  *
Chris@34:  *  Under certain conditions, padding can be utilized so that writing
Chris@34:  *  edited metadata back to the FLAC file does not require rewriting the
Chris@34:  *  entire file.  If rewriting is required, then a temporary workfile is
Chris@34:  *  required.  When writing metadata using callbacks, you must check
Chris@34:  *  this function to know whether to call
Chris@34:  *  FLAC__metadata_chain_write_with_callbacks() or
Chris@34:  *  FLAC__metadata_chain_write_with_callbacks_and_tempfile().  When
Chris@34:  *  writing with FLAC__metadata_chain_write(), the temporary file is
Chris@34:  *  handled internally.
Chris@34:  *
Chris@34:  * \param chain    A pointer to an existing chain.
Chris@34:  * \param use_padding
Chris@34:  *                 Whether or not padding will be allowed to be used
Chris@34:  *                 during the write.  The value of \a use_padding given
Chris@34:  *                 here must match the value later passed to
Chris@34:  *                 FLAC__metadata_chain_write_with_callbacks() or
Chris@34:  *                 FLAC__metadata_chain_write_with_callbacks_with_tempfile().
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if writing the current chain would require a tempfile, or
Chris@34:  *    \c false if metadata can be written in place.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_check_if_tempfile_needed(FLAC__Metadata_Chain *chain, FLAC__bool use_padding);
Chris@34: 
Chris@34: /** Write all metadata out to the FLAC file.  This function tries to be as
Chris@34:  *  efficient as possible; how the metadata is actually written is shown by
Chris@34:  *  the following:
Chris@34:  *
Chris@34:  *  If the current chain is the same size as the existing metadata, the new
Chris@34:  *  data is written in place.
Chris@34:  *
Chris@34:  *  If the current chain is longer than the existing metadata, and
Chris@34:  *  \a use_padding is \c true, and the last block is a PADDING block of
Chris@34:  *  sufficient length, the function will truncate the final padding block
Chris@34:  *  so that the overall size of the metadata is the same as the existing
Chris@34:  *  metadata, and then just rewrite the metadata.  Otherwise, if not all of
Chris@34:  *  the above conditions are met, the entire FLAC file must be rewritten.
Chris@34:  *  If you want to use padding this way it is a good idea to call
Chris@34:  *  FLAC__metadata_chain_sort_padding() first so that you have the maximum
Chris@34:  *  amount of padding to work with, unless you need to preserve ordering
Chris@34:  *  of the PADDING blocks for some reason.
Chris@34:  *
Chris@34:  *  If the current chain is shorter than the existing metadata, and
Chris@34:  *  \a use_padding is \c true, and the final block is a PADDING block, the padding
Chris@34:  *  is extended to make the overall size the same as the existing data.  If
Chris@34:  *  \a use_padding is \c true and the last block is not a PADDING block, a new
Chris@34:  *  PADDING block is added to the end of the new data to make it the same
Chris@34:  *  size as the existing data (if possible, see the note to
Chris@34:  *  FLAC__metadata_simple_iterator_set_block() about the four byte limit)
Chris@34:  *  and the new data is written in place.  If none of the above apply or
Chris@34:  *  \a use_padding is \c false, the entire FLAC file is rewritten.
Chris@34:  *
Chris@34:  *  If \a preserve_file_stats is \c true, the owner and modification time will
Chris@34:  *  be preserved even if the FLAC file is written.
Chris@34:  *
Chris@34:  *  For this write function to be used, the chain must have been read with
Chris@34:  *  FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg(), not
Chris@34:  *  FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks().
Chris@34:  *
Chris@34:  * \param chain               A pointer to an existing chain.
Chris@34:  * \param use_padding         See above.
Chris@34:  * \param preserve_file_stats See above.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if the write succeeded, else \c false.  On failure,
Chris@34:  *    check the status with FLAC__metadata_chain_status().
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__bool preserve_file_stats);
Chris@34: 
Chris@34: /** Write all metadata out to a FLAC stream via callbacks.
Chris@34:  *
Chris@34:  *  (See FLAC__metadata_chain_write() for the details on how padding is
Chris@34:  *  used to write metadata in place if possible.)
Chris@34:  *
Chris@34:  *  The \a handle must be open for updating and be seekable.  The
Chris@34:  *  equivalent minimum stdio fopen() file mode is \c "r+" (or \c "r+b"
Chris@34:  *  for Windows).
Chris@34:  *
Chris@34:  *  For this write function to be used, the chain must have been read with
Chris@34:  *  FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks(),
Chris@34:  *  not FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg().
Chris@34:  *  Also, FLAC__metadata_chain_check_if_tempfile_needed() must have returned
Chris@34:  *  \c false.
Chris@34:  *
Chris@34:  * \param chain        A pointer to an existing chain.
Chris@34:  * \param use_padding  See FLAC__metadata_chain_write()
Chris@34:  * \param handle       The I/O handle of the FLAC stream to write.  The
Chris@34:  *                     handle will NOT be closed after the metadata is
Chris@34:  *                     written; that is the duty of the caller.
Chris@34:  * \param callbacks    A set of callbacks to use for I/O.  The mandatory
Chris@34:  *                     callbacks are \a write and \a seek.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if the write succeeded, else \c false.  On failure,
Chris@34:  *    check the status with FLAC__metadata_chain_status().
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks);
Chris@34: 
Chris@34: /** Write all metadata out to a FLAC stream via callbacks.
Chris@34:  *
Chris@34:  *  (See FLAC__metadata_chain_write() for the details on how padding is
Chris@34:  *  used to write metadata in place if possible.)
Chris@34:  *
Chris@34:  *  This version of the write-with-callbacks function must be used when
Chris@34:  *  FLAC__metadata_chain_check_if_tempfile_needed() returns true.  In
Chris@34:  *  this function, you must supply an I/O handle corresponding to the
Chris@34:  *  FLAC file to edit, and a temporary handle to which the new FLAC
Chris@34:  *  file will be written.  It is the caller's job to move this temporary
Chris@34:  *  FLAC file on top of the original FLAC file to complete the metadata
Chris@34:  *  edit.
Chris@34:  *
Chris@34:  *  The \a handle must be open for reading and be seekable.  The
Chris@34:  *  equivalent minimum stdio fopen() file mode is \c "r" (or \c "rb"
Chris@34:  *  for Windows).
Chris@34:  *
Chris@34:  *  The \a temp_handle must be open for writing.  The
Chris@34:  *  equivalent minimum stdio fopen() file mode is \c "w" (or \c "wb"
Chris@34:  *  for Windows).  It should be an empty stream, or at least positioned
Chris@34:  *  at the start-of-file (in which case it is the caller's duty to
Chris@34:  *  truncate it on return).
Chris@34:  *
Chris@34:  *  For this write function to be used, the chain must have been read with
Chris@34:  *  FLAC__metadata_chain_read_with_callbacks()/FLAC__metadata_chain_read_ogg_with_callbacks(),
Chris@34:  *  not FLAC__metadata_chain_read()/FLAC__metadata_chain_read_ogg().
Chris@34:  *  Also, FLAC__metadata_chain_check_if_tempfile_needed() must have returned
Chris@34:  *  \c true.
Chris@34:  *
Chris@34:  * \param chain        A pointer to an existing chain.
Chris@34:  * \param use_padding  See FLAC__metadata_chain_write()
Chris@34:  * \param handle       The I/O handle of the original FLAC stream to read.
Chris@34:  *                     The handle will NOT be closed after the metadata is
Chris@34:  *                     written; that is the duty of the caller.
Chris@34:  * \param callbacks    A set of callbacks to use for I/O on \a handle.
Chris@34:  *                     The mandatory callbacks are \a read, \a seek, and
Chris@34:  *                     \a eof.
Chris@34:  * \param temp_handle  The I/O handle of the FLAC stream to write.  The
Chris@34:  *                     handle will NOT be closed after the metadata is
Chris@34:  *                     written; that is the duty of the caller.
Chris@34:  * \param temp_callbacks
Chris@34:  *                     A set of callbacks to use for I/O on temp_handle.
Chris@34:  *                     The only mandatory callback is \a write.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if the write succeeded, else \c false.  On failure,
Chris@34:  *    check the status with FLAC__metadata_chain_status().
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_chain_write_with_callbacks_and_tempfile(FLAC__Metadata_Chain *chain, FLAC__bool use_padding, FLAC__IOHandle handle, FLAC__IOCallbacks callbacks, FLAC__IOHandle temp_handle, FLAC__IOCallbacks temp_callbacks);
Chris@34: 
Chris@34: /** Merge adjacent PADDING blocks into a single block.
Chris@34:  *
Chris@34:  * \note This function does not write to the FLAC file, it only
Chris@34:  * modifies the chain.
Chris@34:  *
Chris@34:  * \warning Any iterator on the current chain will become invalid after this
Chris@34:  * call.  You should delete the iterator and get a new one.
Chris@34:  *
Chris@34:  * \param chain               A pointer to an existing chain.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_chain_merge_padding(FLAC__Metadata_Chain *chain);
Chris@34: 
Chris@34: /** This function will move all PADDING blocks to the end on the metadata,
Chris@34:  *  then merge them into a single block.
Chris@34:  *
Chris@34:  * \note This function does not write to the FLAC file, it only
Chris@34:  * modifies the chain.
Chris@34:  *
Chris@34:  * \warning Any iterator on the current chain will become invalid after this
Chris@34:  * call.  You should delete the iterator and get a new one.
Chris@34:  *
Chris@34:  * \param chain  A pointer to an existing chain.
Chris@34:  * \assert
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_chain_sort_padding(FLAC__Metadata_Chain *chain);
Chris@34: 
Chris@34: 
Chris@34: /*********** FLAC__Metadata_Iterator ***********/
Chris@34: 
Chris@34: /** Create a new iterator instance.
Chris@34:  *
Chris@34:  * \retval FLAC__Metadata_Iterator*
Chris@34:  *    \c NULL if there was an error allocating memory, else the new instance.
Chris@34:  */
Chris@34: FLAC_API FLAC__Metadata_Iterator *FLAC__metadata_iterator_new(void);
Chris@34: 
Chris@34: /** Free an iterator instance.  Deletes the object pointed to by \a iterator.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_iterator_delete(FLAC__Metadata_Iterator *iterator);
Chris@34: 
Chris@34: /** Initialize the iterator to point to the first metadata block in the
Chris@34:  *  given chain.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing iterator.
Chris@34:  * \param chain     A pointer to an existing and initialized (read) chain.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \code chain != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_iterator_init(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Chain *chain);
Chris@34: 
Chris@34: /** Moves the iterator forward one metadata block, returning \c false if
Chris@34:  *  already at the end.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if already at the last metadata block of the chain, else
Chris@34:  *    \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_iterator_next(FLAC__Metadata_Iterator *iterator);
Chris@34: 
Chris@34: /** Moves the iterator backward one metadata block, returning \c false if
Chris@34:  *  already at the beginning.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if already at the first metadata block of the chain, else
Chris@34:  *    \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_iterator_prev(FLAC__Metadata_Iterator *iterator);
Chris@34: 
Chris@34: /** Get the type of the metadata block at the current position.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  * \retval FLAC__MetadataType
Chris@34:  *    The type of the metadata block at the current iterator position.
Chris@34:  */
Chris@34: FLAC_API FLAC__MetadataType FLAC__metadata_iterator_get_block_type(const FLAC__Metadata_Iterator *iterator);
Chris@34: 
Chris@34: /** Get the metadata block at the current position.  You can modify
Chris@34:  *  the block in place but must write the chain before the changes
Chris@34:  *  are reflected to the FLAC file.  You do not need to call
Chris@34:  *  FLAC__metadata_iterator_set_block() to reflect the changes;
Chris@34:  *  the pointer returned by FLAC__metadata_iterator_get_block()
Chris@34:  *  points directly into the chain.
Chris@34:  *
Chris@34:  * \warning
Chris@34:  * Do not call FLAC__metadata_object_delete() on the returned object;
Chris@34:  * to delete a block use FLAC__metadata_iterator_delete_block().
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  * \retval FLAC__StreamMetadata*
Chris@34:  *    The current metadata block.
Chris@34:  */
Chris@34: FLAC_API FLAC__StreamMetadata *FLAC__metadata_iterator_get_block(FLAC__Metadata_Iterator *iterator);
Chris@34: 
Chris@34: /** Set the metadata block at the current position, replacing the existing
Chris@34:  *  block.  The new block passed in becomes owned by the chain and it will be
Chris@34:  *  deleted when the chain is deleted.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \param block     A pointer to a metadata block.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  *    \code block != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if the conditions in the above description are not met, or
Chris@34:  *    a memory allocation error occurs, otherwise \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_iterator_set_block(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block);
Chris@34: 
Chris@34: /** Removes the current block from the chain.  If \a replace_with_padding is
Chris@34:  *  \c true, the block will instead be replaced with a padding block of equal
Chris@34:  *  size.  You can not delete the STREAMINFO block.  The iterator will be
Chris@34:  *  left pointing to the block before the one just "deleted", even if
Chris@34:  *  \a replace_with_padding is \c true.
Chris@34:  *
Chris@34:  * \param iterator              A pointer to an existing initialized iterator.
Chris@34:  * \param replace_with_padding  See above.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if the conditions in the above description are not met,
Chris@34:  *    otherwise \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_iterator_delete_block(FLAC__Metadata_Iterator *iterator, FLAC__bool replace_with_padding);
Chris@34: 
Chris@34: /** Insert a new block before the current block.  You cannot insert a block
Chris@34:  *  before the first STREAMINFO block.  You cannot insert a STREAMINFO block
Chris@34:  *  as there can be only one, the one that already exists at the head when you
Chris@34:  *  read in a chain.  The chain takes ownership of the new block and it will be
Chris@34:  *  deleted when the chain is deleted.  The iterator will be left pointing to
Chris@34:  *  the new block.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \param block     A pointer to a metadata block to insert.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if the conditions in the above description are not met, or
Chris@34:  *    a memory allocation error occurs, otherwise \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_before(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block);
Chris@34: 
Chris@34: /** Insert a new block after the current block.  You cannot insert a STREAMINFO
Chris@34:  *  block as there can be only one, the one that already exists at the head when
Chris@34:  *  you read in a chain.  The chain takes ownership of the new block and it will
Chris@34:  *  be deleted when the chain is deleted.  The iterator will be left pointing to
Chris@34:  *  the new block.
Chris@34:  *
Chris@34:  * \param iterator  A pointer to an existing initialized iterator.
Chris@34:  * \param block     A pointer to a metadata block to insert.
Chris@34:  * \assert
Chris@34:  *    \code iterator != NULL \endcode
Chris@34:  *    \a iterator has been successfully initialized with
Chris@34:  *    FLAC__metadata_iterator_init()
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if the conditions in the above description are not met, or
Chris@34:  *    a memory allocation error occurs, otherwise \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_Iterator *iterator, FLAC__StreamMetadata *block);
Chris@34: 
Chris@34: /* \} */
Chris@34: 
Chris@34: 
Chris@34: /** \defgroup flac_metadata_object FLAC/metadata.h: metadata object methods
Chris@34:  *  \ingroup flac_metadata
Chris@34:  *
Chris@34:  * \brief
Chris@34:  * This module contains methods for manipulating FLAC metadata objects.
Chris@34:  *
Chris@34:  * Since many are variable length we have to be careful about the memory
Chris@34:  * management.  We decree that all pointers to data in the object are
Chris@34:  * owned by the object and memory-managed by the object.
Chris@34:  *
Chris@34:  * Use the FLAC__metadata_object_new() and FLAC__metadata_object_delete()
Chris@34:  * functions to create all instances.  When using the
Chris@34:  * FLAC__metadata_object_set_*() functions to set pointers to data, set
Chris@34:  * \a copy to \c true to have the function make it's own copy of the data, or
Chris@34:  * to \c false to give the object ownership of your data.  In the latter case
Chris@34:  * your pointer must be freeable by free() and will be free()d when the object
Chris@34:  * is FLAC__metadata_object_delete()d.  It is legal to pass a null pointer as
Chris@34:  * the data pointer to a FLAC__metadata_object_set_*() function as long as
Chris@34:  * the length argument is 0 and the \a copy argument is \c false.
Chris@34:  *
Chris@34:  * The FLAC__metadata_object_new() and FLAC__metadata_object_clone() function
Chris@34:  * will return \c NULL in the case of a memory allocation error, otherwise a new
Chris@34:  * object.  The FLAC__metadata_object_set_*() functions return \c false in the
Chris@34:  * case of a memory allocation error.
Chris@34:  *
Chris@34:  * We don't have the convenience of C++ here, so note that the library relies
Chris@34:  * on you to keep the types straight.  In other words, if you pass, for
Chris@34:  * example, a FLAC__StreamMetadata* that represents a STREAMINFO block to
Chris@34:  * FLAC__metadata_object_application_set_data(), you will get an assertion
Chris@34:  * failure.
Chris@34:  *
Chris@34:  * For convenience the FLAC__metadata_object_vorbiscomment_*() functions
Chris@34:  * maintain a trailing NUL on each Vorbis comment entry.  This is not counted
Chris@34:  * toward the length or stored in the stream, but it can make working with plain
Chris@34:  * comments (those that don't contain embedded-NULs in the value) easier.
Chris@34:  * Entries passed into these functions have trailing NULs added if missing, and
Chris@34:  * returned entries are guaranteed to have a trailing NUL.
Chris@34:  *
Chris@34:  * The FLAC__metadata_object_vorbiscomment_*() functions that take a Vorbis
Chris@34:  * comment entry/name/value will first validate that it complies with the Vorbis
Chris@34:  * comment specification and return false if it does not.
Chris@34:  *
Chris@34:  * There is no need to recalculate the length field on metadata blocks you
Chris@34:  * have modified.  They will be calculated automatically before they  are
Chris@34:  * written back to a file.
Chris@34:  *
Chris@34:  * \{
Chris@34:  */
Chris@34: 
Chris@34: 
Chris@34: /** Create a new metadata object instance of the given type.
Chris@34:  *
Chris@34:  *  The object will be "empty"; i.e. values and data pointers will be \c 0,
Chris@34:  *  with the exception of FLAC__METADATA_TYPE_VORBIS_COMMENT, which will have
Chris@34:  *  the vendor string set (but zero comments).
Chris@34:  *
Chris@34:  *  Do not pass in a value greater than or equal to
Chris@34:  *  \a FLAC__METADATA_TYPE_UNDEFINED unless you really know what you're
Chris@34:  *  doing.
Chris@34:  *
Chris@34:  * \param type  Type of object to create
Chris@34:  * \retval FLAC__StreamMetadata*
Chris@34:  *    \c NULL if there was an error allocating memory or the type code is
Chris@34:  *    greater than FLAC__MAX_METADATA_TYPE_CODE, else the new instance.
Chris@34:  */
Chris@34: FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type);
Chris@34: 
Chris@34: /** Create a copy of an existing metadata object.
Chris@34:  *
Chris@34:  *  The copy is a "deep" copy, i.e. dynamically allocated data within the
Chris@34:  *  object is also copied.  The caller takes ownership of the new block and
Chris@34:  *  is responsible for freeing it with FLAC__metadata_object_delete().
Chris@34:  *
Chris@34:  * \param object  Pointer to object to copy.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  * \retval FLAC__StreamMetadata*
Chris@34:  *    \c NULL if there was an error allocating memory, else the new instance.
Chris@34:  */
Chris@34: FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object);
Chris@34: 
Chris@34: /** Free a metadata object.  Deletes the object pointed to by \a object.
Chris@34:  *
Chris@34:  *  The delete is a "deep" delete, i.e. dynamically allocated data within the
Chris@34:  *  object is also deleted.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing object.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object);
Chris@34: 
Chris@34: /** Compares two metadata objects.
Chris@34:  *
Chris@34:  *  The compare is "deep", i.e. dynamically allocated data within the
Chris@34:  *  object is also compared.
Chris@34:  *
Chris@34:  * \param block1  A pointer to an existing object.
Chris@34:  * \param block2  A pointer to an existing object.
Chris@34:  * \assert
Chris@34:  *    \code block1 != NULL \endcode
Chris@34:  *    \code block2 != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if objects are identical, else \c false.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2);
Chris@34: 
Chris@34: /** Sets the application data of an APPLICATION block.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the data is stored; otherwise, the object
Chris@34:  *  takes ownership of the pointer.  The existing data will be freed if this
Chris@34:  *  function is successful, otherwise the original data will remain if \a copy
Chris@34:  *  is \c true and malloc() fails.
Chris@34:  *
Chris@34:  * \note It is safe to pass a const pointer to \a data if \a copy is \c true.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing APPLICATION object.
Chris@34:  * \param data    A pointer to the data to set.
Chris@34:  * \param length  The length of \a data in bytes.
Chris@34:  * \param copy    See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_APPLICATION \endcode
Chris@34:  *    \code (data != NULL && length > 0) ||
Chris@34:  * (data == NULL && length == 0 && copy == false) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if \a copy is \c true and malloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, unsigned length, FLAC__bool copy);
Chris@34: 
Chris@34: /** Resize the seekpoint array.
Chris@34:  *
Chris@34:  *  If the size shrinks, elements will truncated; if it grows, new placeholder
Chris@34:  *  points will be added to the end.
Chris@34:  *
Chris@34:  * \param object          A pointer to an existing SEEKTABLE object.
Chris@34:  * \param new_num_points  The desired length of the array; may be \c 0.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  *    \code (object->data.seek_table.points == NULL && object->data.seek_table.num_points == 0) ||
Chris@34:  * (object->data.seek_table.points != NULL && object->data.seek_table.num_points > 0) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation error, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, unsigned new_num_points);
Chris@34: 
Chris@34: /** Set a seekpoint in a seektable.
Chris@34:  *
Chris@34:  * \param object     A pointer to an existing SEEKTABLE object.
Chris@34:  * \param point_num  Index into seekpoint array to set.
Chris@34:  * \param point      The point to set.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  *    \code object->data.seek_table.num_points > point_num \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point);
Chris@34: 
Chris@34: /** Insert a seekpoint into a seektable.
Chris@34:  *
Chris@34:  * \param object     A pointer to an existing SEEKTABLE object.
Chris@34:  * \param point_num  Index into seekpoint array to set.
Chris@34:  * \param point      The point to set.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  *    \code object->data.seek_table.num_points >= point_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation error, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point);
Chris@34: 
Chris@34: /** Delete a seekpoint from a seektable.
Chris@34:  *
Chris@34:  * \param object     A pointer to an existing SEEKTABLE object.
Chris@34:  * \param point_num  Index into seekpoint array to set.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  *    \code object->data.seek_table.num_points > point_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation error, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, unsigned point_num);
Chris@34: 
Chris@34: /** Check a seektable to see if it conforms to the FLAC specification.
Chris@34:  *  See the format specification for limits on the contents of the
Chris@34:  *  seektable.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing SEEKTABLE object.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if seek table is illegal, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object);
Chris@34: 
Chris@34: /** Append a number of placeholder points to the end of a seek table.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * As with the other ..._seektable_template_... functions, you should
Chris@34:  * call FLAC__metadata_object_seektable_template_sort() when finished
Chris@34:  * to make the seek table legal.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing SEEKTABLE object.
Chris@34:  * \param num     The number of placeholder points to append.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, unsigned num);
Chris@34: 
Chris@34: /** Append a specific seek point template to the end of a seek table.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * As with the other ..._seektable_template_... functions, you should
Chris@34:  * call FLAC__metadata_object_seektable_template_sort() when finished
Chris@34:  * to make the seek table legal.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing SEEKTABLE object.
Chris@34:  * \param sample_number  The sample number of the seek point template.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number);
Chris@34: 
Chris@34: /** Append specific seek point templates to the end of a seek table.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * As with the other ..._seektable_template_... functions, you should
Chris@34:  * call FLAC__metadata_object_seektable_template_sort() when finished
Chris@34:  * to make the seek table legal.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing SEEKTABLE object.
Chris@34:  * \param sample_numbers  An array of sample numbers for the seek points.
Chris@34:  * \param num     The number of seek point templates to append.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], unsigned num);
Chris@34: 
Chris@34: /** Append a set of evenly-spaced seek point templates to the end of a
Chris@34:  *  seek table.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * As with the other ..._seektable_template_... functions, you should
Chris@34:  * call FLAC__metadata_object_seektable_template_sort() when finished
Chris@34:  * to make the seek table legal.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing SEEKTABLE object.
Chris@34:  * \param num     The number of placeholder points to append.
Chris@34:  * \param total_samples  The total number of samples to be encoded;
Chris@34:  *                       the seekpoints will be spaced approximately
Chris@34:  *                       \a total_samples / \a num samples apart.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  *    \code total_samples > 0 \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, unsigned num, FLAC__uint64 total_samples);
Chris@34: 
Chris@34: /** Append a set of evenly-spaced seek point templates to the end of a
Chris@34:  *  seek table.
Chris@34:  *
Chris@34:  * \note
Chris@34:  * As with the other ..._seektable_template_... functions, you should
Chris@34:  * call FLAC__metadata_object_seektable_template_sort() when finished
Chris@34:  * to make the seek table legal.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing SEEKTABLE object.
Chris@34:  * \param samples The number of samples apart to space the placeholder
Chris@34:  *                points.  The first point will be at sample \c 0, the
Chris@34:  *                second at sample \a samples, then 2*\a samples, and
Chris@34:  *                so on.  As long as \a samples and \a total_samples
Chris@34:  *                are greater than \c 0, there will always be at least
Chris@34:  *                one seekpoint at sample \c 0.
Chris@34:  * \param total_samples  The total number of samples to be encoded;
Chris@34:  *                       the seekpoints will be spaced
Chris@34:  *                       \a samples samples apart.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  *    \code samples > 0 \endcode
Chris@34:  *    \code total_samples > 0 \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(FLAC__StreamMetadata *object, unsigned samples, FLAC__uint64 total_samples);
Chris@34: 
Chris@34: /** Sort a seek table's seek points according to the format specification,
Chris@34:  *  removing duplicates.
Chris@34:  *
Chris@34:  * \param object   A pointer to a seek table to be sorted.
Chris@34:  * \param compact  If \c false, behaves like FLAC__format_seektable_sort().
Chris@34:  *                 If \c true, duplicates are deleted and the seek table is
Chris@34:  *                 shrunk appropriately; the number of placeholder points
Chris@34:  *                 present in the seek table will be the same after the call
Chris@34:  *                 as before.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_SEEKTABLE \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if realloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact);
Chris@34: 
Chris@34: /** Sets the vendor string in a VORBIS_COMMENT block.
Chris@34:  *
Chris@34:  *  For convenience, a trailing NUL is added to the entry if it doesn't have
Chris@34:  *  one already.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the entry is stored; otherwise, the object
Chris@34:  *  takes ownership of the \c entry.entry pointer.
Chris@34:  *
Chris@34:  *  \note If this function returns \c false, the caller still owns the
Chris@34:  *  pointer.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param entry   The entry to set the vendor string to.
Chris@34:  * \param copy    See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code (entry.entry != NULL && entry.length > 0) ||
Chris@34:  * (entry.entry == NULL && entry.length == 0) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails or \a entry does not comply with the
Chris@34:  *    Vorbis comment specification, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
Chris@34: 
Chris@34: /** Resize the comment array.
Chris@34:  *
Chris@34:  *  If the size shrinks, elements will truncated; if it grows, new empty
Chris@34:  *  fields will be added to the end.
Chris@34:  *
Chris@34:  * \param object            A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param new_num_comments  The desired length of the array; may be \c 0.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code (object->data.vorbis_comment.comments == NULL && object->data.vorbis_comment.num_comments == 0) ||
Chris@34:  * (object->data.vorbis_comment.comments != NULL && object->data.vorbis_comment.num_comments > 0) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, unsigned new_num_comments);
Chris@34: 
Chris@34: /** Sets a comment in a VORBIS_COMMENT block.
Chris@34:  *
Chris@34:  *  For convenience, a trailing NUL is added to the entry if it doesn't have
Chris@34:  *  one already.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the entry is stored; otherwise, the object
Chris@34:  *  takes ownership of the \c entry.entry pointer.
Chris@34:  *
Chris@34:  *  \note If this function returns \c false, the caller still owns the
Chris@34:  *  pointer.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param comment_num  Index into comment array to set.
Chris@34:  * \param entry        The entry to set the comment to.
Chris@34:  * \param copy         See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code comment_num < object->data.vorbis_comment.num_comments \endcode
Chris@34:  *    \code (entry.entry != NULL && entry.length > 0) ||
Chris@34:  * (entry.entry == NULL && entry.length == 0) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails or \a entry does not comply with the
Chris@34:  *    Vorbis comment specification, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
Chris@34: 
Chris@34: /** Insert a comment in a VORBIS_COMMENT block at the given index.
Chris@34:  *
Chris@34:  *  For convenience, a trailing NUL is added to the entry if it doesn't have
Chris@34:  *  one already.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the entry is stored; otherwise, the object
Chris@34:  *  takes ownership of the \c entry.entry pointer.
Chris@34:  *
Chris@34:  *  \note If this function returns \c false, the caller still owns the
Chris@34:  *  pointer.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param comment_num  The index at which to insert the comment.  The comments
Chris@34:  *                     at and after \a comment_num move right one position.
Chris@34:  *                     To append a comment to the end, set \a comment_num to
Chris@34:  *                     \c object->data.vorbis_comment.num_comments .
Chris@34:  * \param entry        The comment to insert.
Chris@34:  * \param copy         See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code object->data.vorbis_comment.num_comments >= comment_num \endcode
Chris@34:  *    \code (entry.entry != NULL && entry.length > 0) ||
Chris@34:  * (entry.entry == NULL && entry.length == 0 && copy == false) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails or \a entry does not comply with the
Chris@34:  *    Vorbis comment specification, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
Chris@34: 
Chris@34: /** Appends a comment to a VORBIS_COMMENT block.
Chris@34:  *
Chris@34:  *  For convenience, a trailing NUL is added to the entry if it doesn't have
Chris@34:  *  one already.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the entry is stored; otherwise, the object
Chris@34:  *  takes ownership of the \c entry.entry pointer.
Chris@34:  *
Chris@34:  *  \note If this function returns \c false, the caller still owns the
Chris@34:  *  pointer.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param entry        The comment to insert.
Chris@34:  * \param copy         See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code (entry.entry != NULL && entry.length > 0) ||
Chris@34:  * (entry.entry == NULL && entry.length == 0 && copy == false) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails or \a entry does not comply with the
Chris@34:  *    Vorbis comment specification, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_append_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy);
Chris@34: 
Chris@34: /** Replaces comments in a VORBIS_COMMENT block with a new one.
Chris@34:  *
Chris@34:  *  For convenience, a trailing NUL is added to the entry if it doesn't have
Chris@34:  *  one already.
Chris@34:  *
Chris@34:  *  Depending on the the value of \a all, either all or just the first comment
Chris@34:  *  whose field name(s) match the given entry's name will be replaced by the
Chris@34:  *  given entry.  If no comments match, \a entry will simply be appended.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the entry is stored; otherwise, the object
Chris@34:  *  takes ownership of the \c entry.entry pointer.
Chris@34:  *
Chris@34:  *  \note If this function returns \c false, the caller still owns the
Chris@34:  *  pointer.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param entry        The comment to insert.
Chris@34:  * \param all          If \c true, all comments whose field name matches
Chris@34:  *                     \a entry's field name will be removed, and \a entry will
Chris@34:  *                     be inserted at the position of the first matching
Chris@34:  *                     comment.  If \c false, only the first comment whose
Chris@34:  *                     field name matches \a entry's field name will be
Chris@34:  *                     replaced with \a entry.
Chris@34:  * \param copy         See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code (entry.entry != NULL && entry.length > 0) ||
Chris@34:  * (entry.entry == NULL && entry.length == 0 && copy == false) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails or \a entry does not comply with the
Chris@34:  *    Vorbis comment specification, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_replace_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool all, FLAC__bool copy);
Chris@34: 
Chris@34: /** Delete a comment in a VORBIS_COMMENT block at the given index.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param comment_num  The index of the comment to delete.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code object->data.vorbis_comment.num_comments > comment_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if realloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num);
Chris@34: 
Chris@34: /** Creates a Vorbis comment entry from NUL-terminated name and value strings.
Chris@34:  *
Chris@34:  *  On return, the filled-in \a entry->entry pointer will point to malloc()ed
Chris@34:  *  memory and shall be owned by the caller.  For convenience the entry will
Chris@34:  *  have a terminating NUL.
Chris@34:  *
Chris@34:  * \param entry              A pointer to a Vorbis comment entry.  The entry's
Chris@34:  *                           \c entry pointer should not point to allocated
Chris@34:  *                           memory as it will be overwritten.
Chris@34:  * \param field_name         The field name in ASCII, \c NUL terminated.
Chris@34:  * \param field_value        The field value in UTF-8, \c NUL terminated.
Chris@34:  * \assert
Chris@34:  *    \code entry != NULL \endcode
Chris@34:  *    \code field_name != NULL \endcode
Chris@34:  *    \code field_value != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if malloc() fails, or if \a field_name or \a field_value does
Chris@34:  *    not comply with the Vorbis comment specification, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, const char *field_value);
Chris@34: 
Chris@34: /** Splits a Vorbis comment entry into NUL-terminated name and value strings.
Chris@34:  *
Chris@34:  *  The returned pointers to name and value will be allocated by malloc()
Chris@34:  *  and shall be owned by the caller.
Chris@34:  *
Chris@34:  * \param entry              An existing Vorbis comment entry.
Chris@34:  * \param field_name         The address of where the returned pointer to the
Chris@34:  *                           field name will be stored.
Chris@34:  * \param field_value        The address of where the returned pointer to the
Chris@34:  *                           field value will be stored.
Chris@34:  * \assert
Chris@34:  *    \code (entry.entry != NULL && entry.length > 0) \endcode
Chris@34:  *    \code memchr(entry.entry, '=', entry.length) != NULL \endcode
Chris@34:  *    \code field_name != NULL \endcode
Chris@34:  *    \code field_value != NULL \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation fails or \a entry does not comply with the
Chris@34:  *    Vorbis comment specification, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_to_name_value_pair(const FLAC__StreamMetadata_VorbisComment_Entry entry, char **field_name, char **field_value);
Chris@34: 
Chris@34: /** Check if the given Vorbis comment entry's field name matches the given
Chris@34:  *  field name.
Chris@34:  *
Chris@34:  * \param entry              An existing Vorbis comment entry.
Chris@34:  * \param field_name         The field name to check.
Chris@34:  * \param field_name_length  The length of \a field_name, not including the
Chris@34:  *                           terminating \c NUL.
Chris@34:  * \assert
Chris@34:  *    \code (entry.entry != NULL && entry.length > 0) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c true if the field names match, else \c false
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry entry, const char *field_name, unsigned field_name_length);
Chris@34: 
Chris@34: /** Find a Vorbis comment with the given field name.
Chris@34:  *
Chris@34:  *  The search begins at entry number \a offset; use an offset of 0 to
Chris@34:  *  search from the beginning of the comment array.
Chris@34:  *
Chris@34:  * \param object      A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param offset      The offset into the comment array from where to start
Chris@34:  *                    the search.
Chris@34:  * \param field_name  The field name of the comment to find.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  *    \code field_name != NULL \endcode
Chris@34:  * \retval int
Chris@34:  *    The offset in the comment array of the first comment whose field
Chris@34:  *    name matches \a field_name, or \c -1 if no match was found.
Chris@34:  */
Chris@34: FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name);
Chris@34: 
Chris@34: /** Remove first Vorbis comment matching the given field name.
Chris@34:  *
Chris@34:  * \param object      A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param field_name  The field name of comment to delete.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  * \retval int
Chris@34:  *    \c -1 for memory allocation error, \c 0 for no matching entries,
Chris@34:  *    \c 1 for one matching entry deleted.
Chris@34:  */
Chris@34: FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name);
Chris@34: 
Chris@34: /** Remove all Vorbis comments matching the given field name.
Chris@34:  *
Chris@34:  * \param object      A pointer to an existing VORBIS_COMMENT object.
Chris@34:  * \param field_name  The field name of comments to delete.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
Chris@34:  * \retval int
Chris@34:  *    \c -1 for memory allocation error, \c 0 for no matching entries,
Chris@34:  *    else the number of matching entries deleted.
Chris@34:  */
Chris@34: FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name);
Chris@34: 
Chris@34: /** Create a new CUESHEET track instance.
Chris@34:  *
Chris@34:  *  The object will be "empty"; i.e. values and data pointers will be \c 0.
Chris@34:  *
Chris@34:  * \retval FLAC__StreamMetadata_CueSheet_Track*
Chris@34:  *    \c NULL if there was an error allocating memory, else the new instance.
Chris@34:  */
Chris@34: FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_new(void);
Chris@34: 
Chris@34: /** Create a copy of an existing CUESHEET track object.
Chris@34:  *
Chris@34:  *  The copy is a "deep" copy, i.e. dynamically allocated data within the
Chris@34:  *  object is also copied.  The caller takes ownership of the new object and
Chris@34:  *  is responsible for freeing it with
Chris@34:  *  FLAC__metadata_object_cuesheet_track_delete().
Chris@34:  *
Chris@34:  * \param object  Pointer to object to copy.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  * \retval FLAC__StreamMetadata_CueSheet_Track*
Chris@34:  *    \c NULL if there was an error allocating memory, else the new instance.
Chris@34:  */
Chris@34: FLAC_API FLAC__StreamMetadata_CueSheet_Track *FLAC__metadata_object_cuesheet_track_clone(const FLAC__StreamMetadata_CueSheet_Track *object);
Chris@34: 
Chris@34: /** Delete a CUESHEET track object
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET track object.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  */
Chris@34: FLAC_API void FLAC__metadata_object_cuesheet_track_delete(FLAC__StreamMetadata_CueSheet_Track *object);
Chris@34: 
Chris@34: /** Resize a track's index point array.
Chris@34:  *
Chris@34:  *  If the size shrinks, elements will truncated; if it grows, new blank
Chris@34:  *  indices will be added to the end.
Chris@34:  *
Chris@34:  * \param object           A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num        The index of the track to modify.  NOTE: this is not
Chris@34:  *                         necessarily the same as the track's \a number field.
Chris@34:  * \param new_num_indices  The desired length of the array; may be \c 0.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code object->data.cue_sheet.num_tracks > track_num \endcode
Chris@34:  *    \code (object->data.cue_sheet.tracks[track_num].indices == NULL && object->data.cue_sheet.tracks[track_num].num_indices == 0) ||
Chris@34:  * (object->data.cue_sheet.tracks[track_num].indices != NULL && object->data.cue_sheet.tracks[track_num].num_indices > 0) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation error, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_resize_indices(FLAC__StreamMetadata *object, unsigned track_num, unsigned new_num_indices);
Chris@34: 
Chris@34: /** Insert an index point in a CUESHEET track at the given index.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num    The index of the track to modify.  NOTE: this is not
Chris@34:  *                     necessarily the same as the track's \a number field.
Chris@34:  * \param index_num    The index into the track's index array at which to
Chris@34:  *                     insert the index point.  NOTE: this is not necessarily
Chris@34:  *                     the same as the index point's \a number field.  The
Chris@34:  *                     indices at and after \a index_num move right one
Chris@34:  *                     position.  To append an index point to the end, set
Chris@34:  *                     \a index_num to
Chris@34:  *                     \c object->data.cue_sheet.tracks[track_num].num_indices .
Chris@34:  * \param index        The index point to insert.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code object->data.cue_sheet.num_tracks > track_num \endcode
Chris@34:  *    \code object->data.cue_sheet.tracks[track_num].num_indices >= index_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if realloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num, FLAC__StreamMetadata_CueSheet_Index index);
Chris@34: 
Chris@34: /** Insert a blank index point in a CUESHEET track at the given index.
Chris@34:  *
Chris@34:  *  A blank index point is one in which all field values are zero.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num    The index of the track to modify.  NOTE: this is not
Chris@34:  *                     necessarily the same as the track's \a number field.
Chris@34:  * \param index_num    The index into the track's index array at which to
Chris@34:  *                     insert the index point.  NOTE: this is not necessarily
Chris@34:  *                     the same as the index point's \a number field.  The
Chris@34:  *                     indices at and after \a index_num move right one
Chris@34:  *                     position.  To append an index point to the end, set
Chris@34:  *                     \a index_num to
Chris@34:  *                     \c object->data.cue_sheet.tracks[track_num].num_indices .
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code object->data.cue_sheet.num_tracks > track_num \endcode
Chris@34:  *    \code object->data.cue_sheet.tracks[track_num].num_indices >= index_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if realloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_insert_blank_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num);
Chris@34: 
Chris@34: /** Delete an index point in a CUESHEET track at the given index.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num    The index into the track array of the track to
Chris@34:  *                     modify.  NOTE: this is not necessarily the same
Chris@34:  *                     as the track's \a number field.
Chris@34:  * \param index_num    The index into the track's index array of the index
Chris@34:  *                     to delete.  NOTE: this is not necessarily the same
Chris@34:  *                     as the index's \a number field.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code object->data.cue_sheet.num_tracks > track_num \endcode
Chris@34:  *    \code object->data.cue_sheet.tracks[track_num].num_indices > index_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if realloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_track_delete_index(FLAC__StreamMetadata *object, unsigned track_num, unsigned index_num);
Chris@34: 
Chris@34: /** Resize the track array.
Chris@34:  *
Chris@34:  *  If the size shrinks, elements will truncated; if it grows, new blank
Chris@34:  *  tracks will be added to the end.
Chris@34:  *
Chris@34:  * \param object            A pointer to an existing CUESHEET object.
Chris@34:  * \param new_num_tracks    The desired length of the array; may be \c 0.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code (object->data.cue_sheet.tracks == NULL && object->data.cue_sheet.num_tracks == 0) ||
Chris@34:  * (object->data.cue_sheet.tracks != NULL && object->data.cue_sheet.num_tracks > 0) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if memory allocation error, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_resize_tracks(FLAC__StreamMetadata *object, unsigned new_num_tracks);
Chris@34: 
Chris@34: /** Sets a track in a CUESHEET block.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the track is stored; otherwise, the object
Chris@34:  *  takes ownership of the \a track pointer.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num    Index into track array to set.  NOTE: this is not
Chris@34:  *                     necessarily the same as the track's \a number field.
Chris@34:  * \param track        The track to set the track to.  You may safely pass in
Chris@34:  *                     a const pointer if \a copy is \c true.
Chris@34:  * \param copy         See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code track_num < object->data.cue_sheet.num_tracks \endcode
Chris@34:  *    \code (track->indices != NULL && track->num_indices > 0) ||
Chris@34:  * (track->indices == NULL && track->num_indices == 0)
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if \a copy is \c true and malloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_set_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy);
Chris@34: 
Chris@34: /** Insert a track in a CUESHEET block at the given index.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the track is stored; otherwise, the object
Chris@34:  *  takes ownership of the \a track pointer.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num    The index at which to insert the track.  NOTE: this
Chris@34:  *                     is not necessarily the same as the track's \a number
Chris@34:  *                     field.  The tracks at and after \a track_num move right
Chris@34:  *                     one position.  To append a track to the end, set
Chris@34:  *                     \a track_num to \c object->data.cue_sheet.num_tracks .
Chris@34:  * \param track        The track to insert.  You may safely pass in a const
Chris@34:  *                     pointer if \a copy is \c true.
Chris@34:  * \param copy         See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code object->data.cue_sheet.num_tracks >= track_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if \a copy is \c true and malloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_track(FLAC__StreamMetadata *object, unsigned track_num, FLAC__StreamMetadata_CueSheet_Track *track, FLAC__bool copy);
Chris@34: 
Chris@34: /** Insert a blank track in a CUESHEET block at the given index.
Chris@34:  *
Chris@34:  *  A blank track is one in which all field values are zero.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num    The index at which to insert the track.  NOTE: this
Chris@34:  *                     is not necessarily the same as the track's \a number
Chris@34:  *                     field.  The tracks at and after \a track_num move right
Chris@34:  *                     one position.  To append a track to the end, set
Chris@34:  *                     \a track_num to \c object->data.cue_sheet.num_tracks .
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code object->data.cue_sheet.num_tracks >= track_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if \a copy is \c true and malloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_insert_blank_track(FLAC__StreamMetadata *object, unsigned track_num);
Chris@34: 
Chris@34: /** Delete a track in a CUESHEET block at the given index.
Chris@34:  *
Chris@34:  * \param object       A pointer to an existing CUESHEET object.
Chris@34:  * \param track_num    The index into the track array of the track to
Chris@34:  *                     delete.  NOTE: this is not necessarily the same
Chris@34:  *                     as the track's \a number field.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  *    \code object->data.cue_sheet.num_tracks > track_num \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if realloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_delete_track(FLAC__StreamMetadata *object, unsigned track_num);
Chris@34: 
Chris@34: /** Check a cue sheet to see if it conforms to the FLAC specification.
Chris@34:  *  See the format specification for limits on the contents of the
Chris@34:  *  cue sheet.
Chris@34:  *
Chris@34:  * \param object     A pointer to an existing CUESHEET object.
Chris@34:  * \param check_cd_da_subset  If \c true, check CUESHEET against more
Chris@34:  *                   stringent requirements for a CD-DA (audio) disc.
Chris@34:  * \param violation  Address of a pointer to a string.  If there is a
Chris@34:  *                   violation, a pointer to a string explanation of the
Chris@34:  *                   violation will be returned here. \a violation may be
Chris@34:  *                   \c NULL if you don't need the returned string.  Do not
Chris@34:  *                   free the returned string; it will always point to static
Chris@34:  *                   data.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if cue sheet is illegal, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMetadata *object, FLAC__bool check_cd_da_subset, const char **violation);
Chris@34: 
Chris@34: /** Calculate and return the CDDB/freedb ID for a cue sheet.  The function
Chris@34:  *  assumes the cue sheet corresponds to a CD; the result is undefined
Chris@34:  *  if the cuesheet's is_cd bit is not set.
Chris@34:  *
Chris@34:  * \param object     A pointer to an existing CUESHEET object.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_CUESHEET \endcode
Chris@34:  * \retval FLAC__uint32
Chris@34:  *    The unsigned integer representation of the CDDB/freedb ID
Chris@34:  */
Chris@34: FLAC_API FLAC__uint32 FLAC__metadata_object_cuesheet_calculate_cddb_id(const FLAC__StreamMetadata *object);
Chris@34: 
Chris@34: /** Sets the MIME type of a PICTURE block.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the string is stored; otherwise, the object
Chris@34:  *  takes ownership of the pointer.  The existing string will be freed if this
Chris@34:  *  function is successful, otherwise the original string will remain if \a copy
Chris@34:  *  is \c true and malloc() fails.
Chris@34:  *
Chris@34:  * \note It is safe to pass a const pointer to \a mime_type if \a copy is \c true.
Chris@34:  *
Chris@34:  * \param object      A pointer to an existing PICTURE object.
Chris@34:  * \param mime_type   A pointer to the MIME type string.  The string must be
Chris@34:  *                    ASCII characters 0x20-0x7e, NUL-terminated.  No validation
Chris@34:  *                    is done.
Chris@34:  * \param copy        See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
Chris@34:  *    \code (mime_type != NULL) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if \a copy is \c true and malloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_picture_set_mime_type(FLAC__StreamMetadata *object, char *mime_type, FLAC__bool copy);
Chris@34: 
Chris@34: /** Sets the description of a PICTURE block.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the string is stored; otherwise, the object
Chris@34:  *  takes ownership of the pointer.  The existing string will be freed if this
Chris@34:  *  function is successful, otherwise the original string will remain if \a copy
Chris@34:  *  is \c true and malloc() fails.
Chris@34:  *
Chris@34:  * \note It is safe to pass a const pointer to \a description if \a copy is \c true.
Chris@34:  *
Chris@34:  * \param object      A pointer to an existing PICTURE object.
Chris@34:  * \param description A pointer to the description string.  The string must be
Chris@34:  *                    valid UTF-8, NUL-terminated.  No validation is done.
Chris@34:  * \param copy        See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
Chris@34:  *    \code (description != NULL) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if \a copy is \c true and malloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_picture_set_description(FLAC__StreamMetadata *object, FLAC__byte *description, FLAC__bool copy);
Chris@34: 
Chris@34: /** Sets the picture data of a PICTURE block.
Chris@34:  *
Chris@34:  *  If \a copy is \c true, a copy of the data is stored; otherwise, the object
Chris@34:  *  takes ownership of the pointer.  Also sets the \a data_length field of the
Chris@34:  *  metadata object to what is passed in as the \a length parameter.  The
Chris@34:  *  existing data will be freed if this function is successful, otherwise the
Chris@34:  *  original data and data_length will remain if \a copy is \c true and
Chris@34:  *  malloc() fails.
Chris@34:  *
Chris@34:  * \note It is safe to pass a const pointer to \a data if \a copy is \c true.
Chris@34:  *
Chris@34:  * \param object  A pointer to an existing PICTURE object.
Chris@34:  * \param data    A pointer to the data to set.
Chris@34:  * \param length  The length of \a data in bytes.
Chris@34:  * \param copy    See above.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
Chris@34:  *    \code (data != NULL && length > 0) ||
Chris@34:  * (data == NULL && length == 0 && copy == false) \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if \a copy is \c true and malloc() fails, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_picture_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, FLAC__uint32 length, FLAC__bool copy);
Chris@34: 
Chris@34: /** Check a PICTURE block to see if it conforms to the FLAC specification.
Chris@34:  *  See the format specification for limits on the contents of the
Chris@34:  *  PICTURE block.
Chris@34:  *
Chris@34:  * \param object     A pointer to existing PICTURE block to be checked.
Chris@34:  * \param violation  Address of a pointer to a string.  If there is a
Chris@34:  *                   violation, a pointer to a string explanation of the
Chris@34:  *                   violation will be returned here. \a violation may be
Chris@34:  *                   \c NULL if you don't need the returned string.  Do not
Chris@34:  *                   free the returned string; it will always point to static
Chris@34:  *                   data.
Chris@34:  * \assert
Chris@34:  *    \code object != NULL \endcode
Chris@34:  *    \code object->type == FLAC__METADATA_TYPE_PICTURE \endcode
Chris@34:  * \retval FLAC__bool
Chris@34:  *    \c false if PICTURE block is illegal, else \c true.
Chris@34:  */
Chris@34: FLAC_API FLAC__bool FLAC__metadata_object_picture_is_legal(const FLAC__StreamMetadata *object, const char **violation);
Chris@34: 
Chris@34: /* \} */
Chris@34: 
Chris@34: #ifdef __cplusplus
Chris@34: }
Chris@34: #endif
Chris@34: 
Chris@34: #endif