#include <limits.h>
#include "libavutil/crc.h"
#include "avcodec.h"
#include "bitstream.h"
#include "golomb.h"
#include "flac.h"
#include <assert.h>
Go to the source code of this file.
Data Structures | |
struct | FLACContext |
Defines | |
#define | ALT_BITSTREAM_READER |
#define | MAX_CHANNELS 8 |
#define | MAX_BLOCKSIZE 65535 |
#define | DECORRELATE(left, right) |
Enumerations | |
enum | decorrelation_type { INDEPENDENT, LEFT_SIDE, RIGHT_SIDE, MID_SIDE } |
Functions | |
static int64_t | get_utf8 (GetBitContext *gb) |
static void | allocate_buffers (FLACContext *s) |
int | ff_flac_is_extradata_valid (AVCodecContext *avctx, enum FLACExtradataFormat *format, uint8_t **streaminfo_start) |
Validate the FLAC extradata. | |
static av_cold int | flac_decode_init (AVCodecContext *avctx) |
static void | dump_headers (AVCodecContext *avctx, FLACStreaminfo *s) |
void | ff_flac_parse_streaminfo (AVCodecContext *avctx, struct FLACStreaminfo *s, const uint8_t *buffer) |
Parse the Streaminfo metadata block. | |
static int | metadata_parse (FLACContext *s) |
Parse a list of metadata blocks. | |
static int | decode_residuals (FLACContext *s, int channel, int pred_order) |
static int | decode_subframe_fixed (FLACContext *s, int channel, int pred_order) |
static int | decode_subframe_lpc (FLACContext *s, int channel, int pred_order) |
static int | decode_subframe (FLACContext *s, int channel) |
static int | decode_frame (FLACContext *s, int alloc_data_size) |
static int | flac_decode_frame (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) |
static av_cold int | flac_decode_close (AVCodecContext *avctx) |
static void | flac_flush (AVCodecContext *avctx) |
Variables | |
static const int | sample_rate_table [] |
static const int | sample_size_table [] |
static const int | blocksize_table [] |
AVCodec | flac_decoder |
For more information on the FLAC format, visit: 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.
#define DECORRELATE | ( | left, | |||
right | ) |
Value:
assert(s->channels == 2);\ for (i = 0; i < s->blocksize; i++) {\ int a= s->decoded[0][i];\ int b= s->decoded[1][i];\ if (s->is32) {\ *samples_32++ = (left) << s->sample_shift;\ *samples_32++ = (right) << s->sample_shift;\ } else {\ *samples_16++ = (left) << s->sample_shift;\ *samples_16++ = (right) << s->sample_shift;\ }\ }\ break;
Referenced by flac_decode_frame().
#define MAX_BLOCKSIZE 65535 |
Definition at line 49 of file flacdec.c.
Referenced by filter_channel(), read_decoding_params(), and read_major_sync().
enum decorrelation_type |
static void allocate_buffers | ( | FLACContext * | s | ) | [static] |
static int decode_frame | ( | FLACContext * | s, | |
int | alloc_data_size | |||
) | [static] |
static int decode_residuals | ( | FLACContext * | s, | |
int | channel, | |||
int | pred_order | |||
) | [static] |
Definition at line 263 of file flacdec.c.
Referenced by decode_subframe_fixed(), and decode_subframe_lpc().
static int decode_subframe | ( | FLACContext * | s, | |
int | channel | |||
) | [inline, static] |
static int decode_subframe_fixed | ( | FLACContext * | s, | |
int | channel, | |||
int | pred_order | |||
) | [static] |
static int decode_subframe_lpc | ( | FLACContext * | s, | |
int | channel, | |||
int | pred_order | |||
) | [static] |
Definition at line 353 of file flacdec.c.
Referenced by decode_subframe(), and shorten_decode_frame().
static void dump_headers | ( | AVCodecContext * | avctx, | |
FLACStreaminfo * | s | |||
) | [static] |
int ff_flac_is_extradata_valid | ( | AVCodecContext * | avctx, | |
enum FLACExtradataFormat * | format, | |||
uint8_t ** | streaminfo_start | |||
) |
Validate the FLAC extradata.
[in] | avctx | codec context containing the extradata. |
[out] | format | extradata format. |
[out] | streaminfo_start | pointer to start of 34-byte STREAMINFO data. |
Definition at line 100 of file flacdec.c.
Referenced by ff_flac_write_header(), flac_decode_init(), flac_write_trailer(), and ogg_build_flac_headers().
void ff_flac_parse_streaminfo | ( | AVCodecContext * | avctx, | |
struct FLACStreaminfo * | s, | |||
const uint8_t * | buffer | |||
) |
Parse the Streaminfo metadata block.
[out] | avctx | codec context to set basic stream parameters |
[out] | s | where parsed information is stored |
[in] | buffer | pointer to start of 34-byte streaminfo data |
Definition at line 183 of file flacdec.c.
Referenced by flac_decode_init(), flac_header(), and metadata_parse().
static av_cold int flac_decode_close | ( | AVCodecContext * | avctx | ) | [static] |
static int flac_decode_frame | ( | AVCodecContext * | avctx, | |
void * | data, | |||
int * | data_size, | |||
const uint8_t * | buf, | |||
int | buf_size | |||
) | [static] |
static av_cold int flac_decode_init | ( | AVCodecContext * | avctx | ) | [static] |
static void flac_flush | ( | AVCodecContext * | avctx | ) | [static] |
static int64_t get_utf8 | ( | GetBitContext * | gb | ) | [static] |
static int metadata_parse | ( | FLACContext * | s | ) | [static] |
Parse a list of metadata blocks.
This list of blocks must begin with the fLaC marker.
s | the flac decoding context containing the gb bit reader used to parse metadata |
Definition at line 224 of file flacdec.c.
Referenced by flac_decode_frame().
const int blocksize_table[] [static] |
Initial value:
{ 0, 192, 576<<0, 576<<1, 576<<2, 576<<3, 0, 0, 256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7 }
Definition at line 86 of file flacdec.c.
Referenced by decode_frame().
Initial value:
{ "flac", CODEC_TYPE_AUDIO, CODEC_ID_FLAC, sizeof(FLACContext), flac_decode_init, NULL, flac_decode_close, flac_decode_frame, CODEC_CAP_DELAY, .flush= flac_flush, .long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"), }
const int sample_rate_table[] [static] |
Initial value:
{ 0, 88200, 176400, 192000, 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000, 0, 0, 0, 0 }
Definition at line 77 of file flacdec.c.
Referenced by decode_frame().
const int sample_size_table[] [static] |
Initial value:
{ 0, 8, 12, 0, 16, 20, 24, 0 }
Definition at line 83 of file flacdec.c.
Referenced by decode_frame().