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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"

Go to the source code of this file.

Data Structures

struct  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.
 
static int get_metadata_size (const uint8_t *buf, int buf_size)
 Determine the size of an inline header.
 
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 flacdec.c.

Function Documentation

static int allocate_buffers ( FLACContext s)
static

Definition at line 127 of file flacdec.c.

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

static void flac_set_bps ( FLACContext s)
static

Definition at line 68 of file flacdec.c.

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

static av_cold int flac_decode_init ( AVCodecContext avctx)
static

Definition at line 90 of file flacdec.c.

static void dump_headers ( AVCodecContext avctx,
FLACStreaminfo s 
)
static

Definition at line 118 of file flacdec.c.

Referenced by 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 flacdec.c.

Referenced by flac_decode_frame().

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 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 flacdec.c.

Referenced by decode_subframe_fixed(), and decode_subframe_lpc().

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

Definition at line 249 of file 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 299 of file flacdec.c.

Referenced by decode_subframe().

static int decode_subframe ( FLACContext s,
int  channel 
)
inlinestatic

Definition at line 335 of file flacdec.c.

Referenced by decode_frame().

static int decode_frame ( FLACContext s)
static

Definition at line 404 of file flacdec.c.

Referenced by flac_decode_frame().

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

Definition at line 487 of file flacdec.c.

static av_cold int flac_decode_close ( AVCodecContext avctx)
static

Definition at line 570 of file flacdec.c.

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,
}

Definition at line 579 of file flacdec.c.