libavcodec/flacdec.c File Reference

FLAC (Free Lossless Audio Codec) decoder. More...

#include <limits.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "bytestream.h"
#include "golomb.h"
#include "flac.h"
#include "flacdata.h"
#include "flacdsp.h"
Include dependency graph for libavcodec/flacdec.c:

Go to the source code of this file.

Data Structures

struct  FLACContext
 

Typedefs

typedef struct FLACContext FLACContext
 

Functions

static int allocate_buffers (FLACContext *s)
 
static void flac_set_bps (FLACContext *s)
 
static av_cold int flac_decode_init (AVCodecContext *avctx)
 
static void dump_headers (AVCodecContext *avctx, FLACStreaminfo *s)
 
static int parse_streaminfo (FLACContext *s, const uint8_t *buf, int buf_size)
 Parse the STREAMINFO from an inline header. More...
 
static int get_metadata_size (const uint8_t *buf, int buf_size)
 Determine the size of an inline header. More...
 
static int decode_residuals (FLACContext *s, int32_t *decoded, int pred_order)
 
static int decode_subframe_fixed (FLACContext *s, int32_t *decoded, int pred_order, int bps)
 
static int decode_subframe_lpc (FLACContext *s, int32_t *decoded, int pred_order, int bps)
 
static int decode_subframe (FLACContext *s, int channel)
 
static int decode_frame (FLACContext *s)
 
static int flac_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
 
static av_cold int flac_decode_close (AVCodecContext *avctx)
 

Variables

AVCodec ff_flac_decoder
 

Detailed Description

FLAC (Free Lossless Audio Codec) decoder.

Author
Alex Beregszaszi
See also
http://flac.sourceforge.net/

This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed through, starting from the initial 'fLaC' signature; or by passing the 34-byte streaminfo structure through avctx->extradata[_size] followed by data starting with the 0xFFF8 marker.

Definition in file libavcodec/flacdec.c.

Typedef Documentation

typedef struct FLACContext FLACContext

Function Documentation

static int allocate_buffers ( FLACContext s)
static

Definition at line 127 of file libavcodec/flacdec.c.

Referenced by decode_frame(), flac_decode_init(), and parse_streaminfo().

static int decode_frame ( FLACContext s)
static

Definition at line 405 of file libavcodec/flacdec.c.

Referenced by flac_decode_frame().

static int decode_residuals ( FLACContext s,
int32_t decoded,
int  pred_order 
)
static

Definition at line 205 of file libavcodec/flacdec.c.

Referenced by decode_subframe_fixed(), and decode_subframe_lpc().

static int decode_subframe ( FLACContext s,
int  channel 
)
inlinestatic

Definition at line 336 of file libavcodec/flacdec.c.

Referenced by decode_frame().

static int decode_subframe_fixed ( FLACContext s,
int32_t decoded,
int  pred_order,
int  bps 
)
static

Definition at line 249 of file libavcodec/flacdec.c.

Referenced by decode_subframe().

static int decode_subframe_lpc ( FLACContext s,
int32_t decoded,
int  pred_order,
int  bps 
)
static

Definition at line 300 of file libavcodec/flacdec.c.

Referenced by decode_subframe().

static void dump_headers ( AVCodecContext avctx,
FLACStreaminfo s 
)
static

Definition at line 118 of file libavcodec/flacdec.c.

Referenced by decode_frame().

static av_cold int flac_decode_close ( AVCodecContext avctx)
static

Definition at line 569 of file libavcodec/flacdec.c.

static int flac_decode_frame ( AVCodecContext avctx,
void data,
int *  got_frame_ptr,
AVPacket avpkt 
)
static

Definition at line 488 of file libavcodec/flacdec.c.

static av_cold int flac_decode_init ( AVCodecContext avctx)
static

Definition at line 90 of file libavcodec/flacdec.c.

static void flac_set_bps ( FLACContext s)
static

Definition at line 68 of file libavcodec/flacdec.c.

Referenced by decode_frame(), flac_decode_init(), and parse_streaminfo().

static int get_metadata_size ( const uint8_t buf,
int  buf_size 
)
static

Determine the size of an inline header.

Parameters
bufinput buffer, starting with the "fLaC" marker
buf_sizebuffer size
Returns
number of bytes in the header, or 0 if more data is needed

Definition at line 184 of file libavcodec/flacdec.c.

Referenced by flac_decode_frame().

static int parse_streaminfo ( FLACContext s,
const uint8_t buf,
int  buf_size 
)
static

Parse the STREAMINFO from an inline header.

Parameters
sthe flac decoding context
bufinput buffer, starting with the "fLaC" marker
buf_sizebuffer size
Returns
non-zero if metadata is invalid

Definition at line 154 of file libavcodec/flacdec.c.

Referenced by flac_decode_frame().

Variable Documentation

AVCodec ff_flac_decoder
Initial value:
= {
.name = "flac",
.priv_data_size = sizeof(FLACContext),
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
}
struct FLACContext FLACContext
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
signed 16 bits
Definition: samplefmt.h:52
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
signed 32 bits, planar
Definition: samplefmt.h:59
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
signed 32 bits
Definition: samplefmt.h:53
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:375
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:49
signed 16 bits, planar
Definition: samplefmt.h:58
static av_cold int flac_decode_init(AVCodecContext *avctx)
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: crystalhd.c:868
static av_cold int flac_decode_close(AVCodecContext *avctx)
static int flac_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)

Definition at line 578 of file libavcodec/flacdec.c.