Chris@2: /********************************************************************
Chris@2:  *                                                                  *
Chris@2:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
Chris@2:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
Chris@2:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
Chris@2:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
Chris@2:  *                                                                  *
Chris@2:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001             *
Chris@2:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
Chris@2:  *                                                                  *
Chris@2:  ********************************************************************
Chris@2: 
Chris@2:  function: vorbis encode-engine setup
Chris@2:  last mod: $Id: vorbisenc.h 17021 2010-03-24 09:29:41Z xiphmont $
Chris@2: 
Chris@2:  ********************************************************************/
Chris@2: 
Chris@2: /** \file
Chris@2:  * Libvorbisenc is a convenient API for setting up an encoding
Chris@2:  * environment using libvorbis. Libvorbisenc encapsulates the
Chris@2:  * actions needed to set up the encoder properly.
Chris@2:  */
Chris@2: 
Chris@2: #ifndef _OV_ENC_H_
Chris@2: #define _OV_ENC_H_
Chris@2: 
Chris@2: #ifdef __cplusplus
Chris@2: extern "C"
Chris@2: {
Chris@2: #endif /* __cplusplus */
Chris@2: 
Chris@2: #include "codec.h"
Chris@2: 
Chris@2: /**
Chris@2:  * This is the primary function within libvorbisenc for setting up managed
Chris@2:  * bitrate modes.
Chris@2:  *
Chris@2:  * Before this function is called, the \ref vorbis_info
Chris@2:  * struct should be initialized by using vorbis_info_init() from the libvorbis
Chris@2:  * API.  After encoding, vorbis_info_clear() should be called.
Chris@2:  *
Chris@2:  * The max_bitrate, nominal_bitrate, and min_bitrate settings are used to set
Chris@2:  * constraints for the encoded file.  This function uses these settings to
Chris@2:  * select the appropriate encoding mode and set it up.
Chris@2:  *
Chris@2:  * \param vi               Pointer to an initialized \ref vorbis_info struct.
Chris@2:  * \param channels         The number of channels to be encoded.
Chris@2:  * \param rate             The sampling rate of the source audio.
Chris@2:  * \param max_bitrate      Desired maximum bitrate (limit). -1 indicates unset.
Chris@2:  * \param nominal_bitrate  Desired average, or central, bitrate. -1 indicates unset.
Chris@2:  * \param min_bitrate      Desired minimum bitrate. -1 indicates unset.
Chris@2:  *
Chris@2:  * \return Zero for success, and negative values for failure.
Chris@2:  *
Chris@2:  * \retval 0          Success.
Chris@2:  * \retval OV_EFAULT  Internal logic fault; indicates a bug or heap/stack corruption.
Chris@2:  * \retval OV_EINVAL  Invalid setup request, eg, out of range argument.
Chris@2:  * \retval OV_EIMPL   Unimplemented mode; unable to comply with bitrate request.
Chris@2:  */
Chris@2: extern int vorbis_encode_init(vorbis_info *vi,
Chris@2:                               long channels,
Chris@2:                               long rate,
Chris@2: 
Chris@2:                               long max_bitrate,
Chris@2:                               long nominal_bitrate,
Chris@2:                               long min_bitrate);
Chris@2: 
Chris@2: /**
Chris@2:  * This function performs step-one of a three-step bitrate-managed encode
Chris@2:  * setup.  It functions similarly to the one-step setup performed by \ref
Chris@2:  * vorbis_encode_init but allows an application to make further encode setup
Chris@2:  * tweaks using \ref vorbis_encode_ctl before finally calling \ref
Chris@2:  * vorbis_encode_setup_init to complete the setup process.
Chris@2:  *
Chris@2:  * Before this function is called, the \ref vorbis_info struct should be
Chris@2:  * initialized by using vorbis_info_init() from the libvorbis API.  After
Chris@2:  * encoding, vorbis_info_clear() should be called.
Chris@2:  *
Chris@2:  * The max_bitrate, nominal_bitrate, and min_bitrate settings are used to set
Chris@2:  * constraints for the encoded file.  This function uses these settings to
Chris@2:  * select the appropriate encoding mode and set it up.
Chris@2:  *
Chris@2:  * \param vi                Pointer to an initialized vorbis_info struct.
Chris@2:  * \param channels          The number of channels to be encoded.
Chris@2:  * \param rate              The sampling rate of the source audio.
Chris@2:  * \param max_bitrate       Desired maximum bitrate (limit). -1 indicates unset.
Chris@2:  * \param nominal_bitrate   Desired average, or central, bitrate. -1 indicates unset.
Chris@2:  * \param min_bitrate       Desired minimum bitrate. -1 indicates unset.
Chris@2:  *
Chris@2:  * \return Zero for success, and negative for failure.
Chris@2:  *
Chris@2:  * \retval 0           Success
Chris@2:  * \retval OV_EFAULT   Internal logic fault; indicates a bug or heap/stack corruption.
Chris@2:  * \retval OV_EINVAL   Invalid setup request, eg, out of range argument.
Chris@2:  * \retval OV_EIMPL    Unimplemented mode; unable to comply with bitrate request.
Chris@2:  */
Chris@2: extern int vorbis_encode_setup_managed(vorbis_info *vi,
Chris@2:                                        long channels,
Chris@2:                                        long rate,
Chris@2: 
Chris@2:                                        long max_bitrate,
Chris@2:                                        long nominal_bitrate,
Chris@2:                                        long min_bitrate);
Chris@2: 
Chris@2: /**
Chris@2:  * This function performs step-one of a three-step variable bitrate
Chris@2:  * (quality-based) encode setup.  It functions similarly to the one-step setup
Chris@2:  * performed by \ref vorbis_encode_init_vbr() but allows an application to
Chris@2:  * make further encode setup tweaks using \ref vorbis_encode_ctl() before
Chris@2:  * finally calling \ref vorbis_encode_setup_init to complete the setup
Chris@2:  * process.
Chris@2:  *
Chris@2:  * Before this function is called, the \ref vorbis_info struct should be
Chris@2:  * initialized by using \ref vorbis_info_init() from the libvorbis API.  After
Chris@2:  * encoding, vorbis_info_clear() should be called.
Chris@2:  *
Chris@2:  * \param vi        Pointer to an initialized vorbis_info struct.
Chris@2:  * \param channels  The number of channels to be encoded.
Chris@2:  * \param rate      The sampling rate of the source audio.
Chris@2:  * \param quality   Desired quality level, currently from -0.1 to 1.0 (lo to hi).
Chris@2:  *
Chris@2:  * \return Zero for success, and negative values for failure.
Chris@2:  *
Chris@2:  * \retval  0          Success
Chris@2:  * \retval  OV_EFAULT  Internal logic fault; indicates a bug or heap/stack corruption.
Chris@2:  * \retval  OV_EINVAL  Invalid setup request, eg, out of range argument.
Chris@2:  * \retval  OV_EIMPL   Unimplemented mode; unable to comply with quality level request.
Chris@2:  */
Chris@2: extern int vorbis_encode_setup_vbr(vorbis_info *vi,
Chris@2:                                   long channels,
Chris@2:                                   long rate,
Chris@2: 
Chris@2:                                   float quality
Chris@2:                                   );
Chris@2: 
Chris@2: /**
Chris@2:  * This is the primary function within libvorbisenc for setting up variable
Chris@2:  * bitrate ("quality" based) modes.
Chris@2:  *
Chris@2:  *
Chris@2:  * Before this function is called, the vorbis_info struct should be
Chris@2:  * initialized by using vorbis_info_init() from the libvorbis API. After
Chris@2:  * encoding, vorbis_info_clear() should be called.
Chris@2:  *
Chris@2:  * \param vi           Pointer to an initialized vorbis_info struct.
Chris@2:  * \param channels     The number of channels to be encoded.
Chris@2:  * \param rate         The sampling rate of the source audio.
Chris@2:  * \param base_quality Desired quality level, currently from -0.1 to 1.0 (lo to hi).
Chris@2:  *
Chris@2:  *
Chris@2:  * \return Zero for success, or a negative number for failure.
Chris@2:  *
Chris@2:  * \retval 0           Success
Chris@2:  * \retval OV_EFAULT   Internal logic fault; indicates a bug or heap/stack corruption.
Chris@2:  * \retval OV_EINVAL   Invalid setup request, eg, out of range argument.
Chris@2:  * \retval OV_EIMPL    Unimplemented mode; unable to comply with quality level request.
Chris@2:  */
Chris@2: extern int vorbis_encode_init_vbr(vorbis_info *vi,
Chris@2:                                   long channels,
Chris@2:                                   long rate,
Chris@2: 
Chris@2:                                   float base_quality
Chris@2:                                   );
Chris@2: 
Chris@2: /**
Chris@2:  * This function performs the last stage of three-step encoding setup, as
Chris@2:  * described in the API overview under managed bitrate modes.
Chris@2:  *
Chris@2:  * Before this function is called, the \ref vorbis_info struct should be
Chris@2:  * initialized by using vorbis_info_init() from the libvorbis API, one of
Chris@2:  * \ref vorbis_encode_setup_managed() or \ref vorbis_encode_setup_vbr() called to
Chris@2:  * initialize the high-level encoding setup, and \ref vorbis_encode_ctl()
Chris@2:  * called if necessary to make encoding setup changes.
Chris@2:  * vorbis_encode_setup_init() finalizes the highlevel encoding structure into
Chris@2:  * a complete encoding setup after which the application may make no further
Chris@2:  * setup changes.
Chris@2:  *
Chris@2:  * After encoding, vorbis_info_clear() should be called.
Chris@2:  *
Chris@2:  * \param vi Pointer to an initialized \ref vorbis_info struct.
Chris@2:  *
Chris@2:  * \return Zero for success, and negative values for failure.
Chris@2:  *
Chris@2:  * \retval  0           Success.
Chris@2:  * \retval  OV_EFAULT  Internal logic fault; indicates a bug or heap/stack corruption.
Chris@2:  *
Chris@2:  * \retval OV_EINVAL   Attempt to use vorbis_encode_setup_init() without first
Chris@2:  * calling one of vorbis_encode_setup_managed() or vorbis_encode_setup_vbr() to
Chris@2:  * initialize the high-level encoding setup
Chris@2:  *
Chris@2:  */
Chris@2: extern int vorbis_encode_setup_init(vorbis_info *vi);
Chris@2: 
Chris@2: /**
Chris@2:  * This function implements a generic interface to miscellaneous encoder
Chris@2:  * settings similar to the classic UNIX 'ioctl()' system call.  Applications
Chris@2:  * may use vorbis_encode_ctl() to query or set bitrate management or quality
Chris@2:  * mode details by using one of several \e request arguments detailed below.
Chris@2:  * vorbis_encode_ctl() must be called after one of
Chris@2:  * vorbis_encode_setup_managed() or vorbis_encode_setup_vbr().  When used
Chris@2:  * to modify settings, \ref vorbis_encode_ctl() must be called before \ref
Chris@2:  * vorbis_encode_setup_init().
Chris@2:  *
Chris@2:  * \param vi      Pointer to an initialized vorbis_info struct.
Chris@2:  *
Chris@2:  * \param number Specifies the desired action; See \ref encctlcodes "the list
Chris@2:  * of available requests".
Chris@2:  *
Chris@2:  * \param arg void * pointing to a data structure matching the request
Chris@2:  * argument.
Chris@2:  *
Chris@2:  * \retval 0          Success. Any further return information (such as the result of a
Chris@2:  * query) is placed into the storage pointed to by *arg.
Chris@2:  *
Chris@2:  * \retval OV_EINVAL  Invalid argument, or an attempt to modify a setting after
Chris@2:  * calling vorbis_encode_setup_init().
Chris@2:  *
Chris@2:  * \retval OV_EIMPL   Unimplemented or unknown request
Chris@2:  */
Chris@2: extern int vorbis_encode_ctl(vorbis_info *vi,int number,void *arg);
Chris@2: 
Chris@2: /**
Chris@2:  * \deprecated This is a deprecated interface. Please use vorbis_encode_ctl()
Chris@2:  * with the \ref ovectl_ratemanage2_arg struct and \ref
Chris@2:  * OV_ECTL_RATEMANAGE2_GET and \ref OV_ECTL_RATEMANAGE2_SET calls in new code.
Chris@2:  *
Chris@2:  * The \ref ovectl_ratemanage_arg structure is used with vorbis_encode_ctl()
Chris@2:  * and the \ref OV_ECTL_RATEMANAGE_GET, \ref OV_ECTL_RATEMANAGE_SET, \ref
Chris@2:  * OV_ECTL_RATEMANAGE_AVG, \ref OV_ECTL_RATEMANAGE_HARD calls in order to
Chris@2:  * query and modify specifics of the encoder's bitrate management
Chris@2:  * configuration.
Chris@2: */
Chris@2: struct ovectl_ratemanage_arg {
Chris@2:   int    management_active; /**< nonzero if bitrate management is active*/
Chris@2: /** hard lower limit (in kilobits per second) below which the stream bitrate
Chris@2:     will never be allowed for any given bitrate_hard_window seconds of time.*/
Chris@2:   long   bitrate_hard_min;
Chris@2: /** hard upper limit (in kilobits per second) above which the stream bitrate
Chris@2:     will never be allowed for any given bitrate_hard_window seconds of time.*/
Chris@2:   long   bitrate_hard_max;
Chris@2: /** the window period (in seconds) used to regulate the hard bitrate minimum
Chris@2:     and maximum*/
Chris@2:   double bitrate_hard_window;
Chris@2: /** soft lower limit (in kilobits per second) below which the average bitrate
Chris@2:     tracker will start nudging the bitrate higher.*/
Chris@2:   long   bitrate_av_lo;
Chris@2: /** soft upper limit (in kilobits per second) above which the average bitrate
Chris@2:     tracker will start nudging the bitrate lower.*/
Chris@2:   long   bitrate_av_hi;
Chris@2: /** the window period (in seconds) used to regulate the average bitrate
Chris@2:     minimum and maximum.*/
Chris@2:   double bitrate_av_window;
Chris@2: /** Regulates the relative centering of the average and hard windows; in
Chris@2:     libvorbis 1.0 and 1.0.1, the hard window regulation overlapped but
Chris@2:     followed the average window regulation. In libvorbis 1.1 a bit-reservoir
Chris@2:     interface replaces the old windowing interface; the older windowing
Chris@2:     interface is simulated and this field has no effect.*/
Chris@2:   double bitrate_av_window_center;
Chris@2: };
Chris@2: 
Chris@2: /**
Chris@2:  * \name struct ovectl_ratemanage2_arg
Chris@2:  *
Chris@2:  * The ovectl_ratemanage2_arg structure is used with vorbis_encode_ctl() and
Chris@2:  * the OV_ECTL_RATEMANAGE2_GET and OV_ECTL_RATEMANAGE2_SET calls in order to
Chris@2:  * query and modify specifics of the encoder's bitrate management
Chris@2:  * configuration.
Chris@2:  *
Chris@2: */
Chris@2: struct ovectl_ratemanage2_arg {
Chris@2:   int    management_active; /**< nonzero if bitrate management is active */
Chris@2: /** Lower allowed bitrate limit in kilobits per second */
Chris@2:   long   bitrate_limit_min_kbps;
Chris@2: /** Upper allowed bitrate limit in kilobits per second */
Chris@2:   long   bitrate_limit_max_kbps;
Chris@2:   long   bitrate_limit_reservoir_bits; /**<Size of the bitrate reservoir in bits */
Chris@2: /** Regulates the bitrate reservoir's preferred fill level in a range from 0.0
Chris@2:  * to 1.0; 0.0 tries to bank bits to buffer against future bitrate spikes, 1.0
Chris@2:  * buffers against future sudden drops in instantaneous bitrate. Default is
Chris@2:  * 0.1
Chris@2:  */
Chris@2:   double bitrate_limit_reservoir_bias;
Chris@2: /** Average bitrate setting in kilobits per second */
Chris@2:   long   bitrate_average_kbps;
Chris@2: /** Slew rate limit setting for average bitrate adjustment; sets the minimum
Chris@2:  *  time in seconds the bitrate tracker may swing from one extreme to the
Chris@2:  *  other when boosting or damping average bitrate.
Chris@2:  */
Chris@2:   double bitrate_average_damping;
Chris@2: };
Chris@2: 
Chris@2: 
Chris@2: /**
Chris@2:  * \name vorbis_encode_ctl() codes
Chris@2:  *
Chris@2:  * \anchor encctlcodes
Chris@2:  *
Chris@2:  * These values are passed as the \c number parameter of vorbis_encode_ctl().
Chris@2:  * The type of the referent of that function's \c arg pointer depends on these
Chris@2:  * codes.
Chris@2:  */
Chris@2: /*@{*/
Chris@2: 
Chris@2: /**
Chris@2:  * Query the current encoder bitrate management setting.
Chris@2:  *
Chris@2:  *Argument: <tt>struct ovectl_ratemanage2_arg *</tt>
Chris@2:  *
Chris@2:  * Used to query the current encoder bitrate management setting. Also used to
Chris@2:  * initialize fields of an ovectl_ratemanage2_arg structure for use with
Chris@2:  * \ref OV_ECTL_RATEMANAGE2_SET.
Chris@2:  */
Chris@2: #define OV_ECTL_RATEMANAGE2_GET      0x14
Chris@2: 
Chris@2: /**
Chris@2:  * Set the current encoder bitrate management settings.
Chris@2:  *
Chris@2:  * Argument: <tt>struct ovectl_ratemanage2_arg *</tt>
Chris@2:  *
Chris@2:  * Used to set the current encoder bitrate management settings to the values
Chris@2:  * listed in the ovectl_ratemanage2_arg. Passing a NULL pointer will disable
Chris@2:  * bitrate management.
Chris@2: */
Chris@2: #define OV_ECTL_RATEMANAGE2_SET      0x15
Chris@2: 
Chris@2: /**
Chris@2:  * Returns the current encoder hard-lowpass setting (kHz) in the double
Chris@2:  * pointed to by arg.
Chris@2:  *
Chris@2:  * Argument: <tt>double *</tt>
Chris@2: */
Chris@2: #define OV_ECTL_LOWPASS_GET          0x20
Chris@2: 
Chris@2: /**
Chris@2:  *  Sets the encoder hard-lowpass to the value (kHz) pointed to by arg. Valid
Chris@2:  *  lowpass settings range from 2 to 99.
Chris@2:  *
Chris@2:  * Argument: <tt>double *</tt>
Chris@2: */
Chris@2: #define OV_ECTL_LOWPASS_SET          0x21
Chris@2: 
Chris@2: /**
Chris@2:  *  Returns the current encoder impulse block setting in the double pointed
Chris@2:  *  to by arg.
Chris@2:  *
Chris@2:  * Argument: <tt>double *</tt>
Chris@2: */
Chris@2: #define OV_ECTL_IBLOCK_GET           0x30
Chris@2: 
Chris@2: /**
Chris@2:  *  Sets the impulse block bias to the the value pointed to by arg.
Chris@2:  *
Chris@2:  * Argument: <tt>double *</tt>
Chris@2:  *
Chris@2:  *  Valid range is -15.0 to 0.0 [default]. A negative impulse block bias will
Chris@2:  *  direct to encoder to use more bits when incoding short blocks that contain
Chris@2:  *  strong impulses, thus improving the accuracy of impulse encoding.
Chris@2:  */
Chris@2: #define OV_ECTL_IBLOCK_SET           0x31
Chris@2: 
Chris@2: /**
Chris@2:  *  Returns the current encoder coupling setting in the int pointed
Chris@2:  *  to by arg.
Chris@2:  *
Chris@2:  * Argument: <tt>int *</tt>
Chris@2: */
Chris@2: #define OV_ECTL_COUPLING_GET         0x40
Chris@2: 
Chris@2: /**
Chris@2:  *  Enables/disables channel coupling in multichannel encoding according to arg.
Chris@2:  *
Chris@2:  * Argument: <tt>int *</tt>
Chris@2:  *
Chris@2:  *  Zero disables channel coupling for multichannel inputs, nonzer enables
Chris@2:  *  channel coupling.  Setting has no effect on monophonic encoding or
Chris@2:  *  multichannel counts that do not offer coupling.  At present, coupling is
Chris@2:  *  available for stereo and 5.1 encoding.
Chris@2:  */
Chris@2: #define OV_ECTL_COUPLING_SET         0x41
Chris@2: 
Chris@2:   /* deprecated rate management supported only for compatibility */
Chris@2: 
Chris@2: /**
Chris@2:  * Old interface to querying bitrate management settings.
Chris@2:  *
Chris@2:  * Deprecated after move to bit-reservoir style management in 1.1 rendered
Chris@2:  * this interface partially obsolete.
Chris@2: 
Chris@2:  * \deprecated Please use \ref OV_ECTL_RATEMANAGE2_GET instead.
Chris@2:  *
Chris@2:  * Argument: <tt>struct ovectl_ratemanage_arg *</tt>
Chris@2:  */
Chris@2: #define OV_ECTL_RATEMANAGE_GET       0x10
Chris@2: /**
Chris@2:  * Old interface to modifying bitrate management settings.
Chris@2:  *
Chris@2:  *  deprecated after move to bit-reservoir style management in 1.1 rendered
Chris@2:  *  this interface partially obsolete.
Chris@2:  *
Chris@2:  * \deprecated Please use \ref OV_ECTL_RATEMANAGE2_SET instead.
Chris@2:  *
Chris@2:  * Argument: <tt>struct ovectl_ratemanage_arg *</tt>
Chris@2:  */
Chris@2: #define OV_ECTL_RATEMANAGE_SET       0x11
Chris@2: /**
Chris@2:  * Old interface to setting average-bitrate encoding mode.
Chris@2:  *
Chris@2:  * Deprecated after move to bit-reservoir style management in 1.1 rendered
Chris@2:  * this interface partially obsolete.
Chris@2:  *
Chris@2:  *  \deprecated Please use \ref OV_ECTL_RATEMANAGE2_SET instead.
Chris@2:  *
Chris@2:  * Argument: <tt>struct ovectl_ratemanage_arg *</tt>
Chris@2:  */
Chris@2: #define OV_ECTL_RATEMANAGE_AVG       0x12
Chris@2: /**
Chris@2:  * Old interface to setting bounded-bitrate encoding modes.
Chris@2:  *
Chris@2:  * deprecated after move to bit-reservoir style management in 1.1 rendered
Chris@2:  * this interface partially obsolete.
Chris@2:  *
Chris@2:  *  \deprecated Please use \ref OV_ECTL_RATEMANAGE2_SET instead.
Chris@2:  *
Chris@2:  * Argument: <tt>struct ovectl_ratemanage_arg *</tt>
Chris@2:  */
Chris@2: #define OV_ECTL_RATEMANAGE_HARD      0x13
Chris@2: 
Chris@2: /*@}*/
Chris@2: 
Chris@2: 
Chris@2: 
Chris@2: #ifdef __cplusplus
Chris@2: }
Chris@2: #endif /* __cplusplus */
Chris@2: 
Chris@2: #endif