flacdec.c File Reference

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

#include <limits.h>
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "golomb.h"
#include "flac.h"
#include "flacdsp.h"
#include "flac_parse.h"
#include "thread.h"
#include "unary.h"

Go to the source code of this file.

Data Structures
struct	FLACContext

Macros
#define	DECODER_SUBFRAME_FIXED_WIDE(residual)

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_fixed_wide (FLACContext *s, int32_t *decoded, int pred_order, int bps)
static int	decode_subframe_fixed_33bps (FLACContext *s, int64_t *decoded, int32_t *residual, int pred_order)
static void	lpc_analyze_remodulate (SUINT32 *decoded, const int coeffs[32], int order, int qlevel, int len, int bps)
static int	decode_subframe_lpc (FLACContext *s, int32_t *decoded, int pred_order, int bps)
static int	decode_subframe_lpc_33bps (FLACContext *s, int64_t *decoded, int32_t *residual, int pred_order)
static int	decode_subframe (FLACContext *s, int channel)
static int	decode_frame (FLACContext *s)
static void	decorrelate_33bps (int ch_mode, int32_t **decoded, int64_t *decoded_33bps, int len)
static int	flac_decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
static av_cold int	flac_decode_close (AVCodecContext *avctx)

Variables
static const AVOption	options []
static const AVClass	flac_decoder_class
const FFCodec	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.

Macro Definition Documentation

DECODER_SUBFRAME_FIXED_WIDE

#define DECODER_SUBFRAME_FIXED_WIDE

(

residual

)

Definition at line 354 of file flacdec.c.

Referenced by decode_subframe_fixed_wide().

Function Documentation

allocate_buffers()

static int allocate_buffers ( FLACContext * s )

static

Definition at line 137 of file flacdec.c.

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

flac_set_bps()

static void flac_set_bps ( FLACContext * s )

static

Definition at line 76 of file flacdec.c.

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

flac_decode_init()

static av_cold int flac_decode_init ( AVCodecContext * avctx )

static

Definition at line 98 of file flacdec.c.

dump_headers()

static void dump_headers ( AVCodecContext * avctx, FLACStreaminfo * s )

static

Definition at line 128 of file flacdec.c.

Referenced by decode_frame().

parse_streaminfo()

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

static

Parse the STREAMINFO from an inline header.

Parameters

s	the flac decoding context
buf	input buffer, starting with the "fLaC" marker
buf_size	buffer size

Returns

non-zero if metadata is invalid

Definition at line 187 of file flacdec.c.

Referenced by flac_decode_frame().

get_metadata_size()

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

static

Determine the size of an inline header.

Parameters

buf	input buffer, starting with the "fLaC" marker
buf_size	buffer size

Returns

number of bytes in the header, or 0 if more data is needed

Definition at line 220 of file flacdec.c.

Referenced by flac_decode_frame().

decode_residuals()

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

static

Definition at line 241 of file flacdec.c.

Referenced by decode_subframe_fixed(), decode_subframe_lpc(), and decode_subframe_lpc_33bps().

decode_subframe_fixed()

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

static

Definition at line 302 of file flacdec.c.

Referenced by decode_subframe().

decode_subframe_fixed_wide()

static int decode_subframe_fixed_wide ( FLACContext * s, int32_t * decoded, int pred_order, int bps )

static

Definition at line 389 of file flacdec.c.

Referenced by decode_subframe().

decode_subframe_fixed_33bps()

static int decode_subframe_fixed_33bps ( FLACContext * s, int64_t * decoded, int32_t * residual, int pred_order )

static

Definition at line 400 of file flacdec.c.

Referenced by decode_subframe().

lpc_analyze_remodulate()

static void lpc_analyze_remodulate ( SUINT32 * decoded, const int coeffs[32], int order, int qlevel, int len, int bps )

static

Definition at line 410 of file flacdec.c.

Referenced by decode_subframe_lpc().

decode_subframe_lpc()

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

static

Definition at line 437 of file flacdec.c.

Referenced by decode_subframe().

decode_subframe_lpc_33bps()

static int decode_subframe_lpc_33bps ( FLACContext * s, int64_t * decoded, int32_t * residual, int pred_order )

static

Definition at line 481 of file flacdec.c.

Referenced by decode_subframe().

decode_subframe()

static int decode_subframe ( FLACContext * s, int channel )

inlinestatic

Definition at line 517 of file flacdec.c.

Referenced by decode_frame().

decode_frame()

static int decode_frame ( FLACContext * s )

static

Definition at line 609 of file flacdec.c.

Referenced by flac_decode_frame().

decorrelate_33bps()

static void decorrelate_33bps ( int ch_mode, int32_t ** decoded, int64_t * decoded_33bps, int len )

static

Definition at line 694 of file flacdec.c.

Referenced by flac_decode_frame().

flac_decode_frame()

static int flac_decode_frame ( AVCodecContext * avctx, AVFrame * frame, int * got_frame_ptr, AVPacket * avpkt )

static

Definition at line 714 of file flacdec.c.

flac_decode_close()

static av_cold int flac_decode_close ( AVCodecContext * avctx )

static

Definition at line 796 of file flacdec.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
{ "use_buggy_lpc", "emulate old buggy lavc behavior",  0x42 , AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM },
{ NULL },
}

Definition at line 806 of file flacdec.c.

flac_decoder_class

const AVClass flac_decoder_class

static

Initial value:

= {
    .class_name = "FLAC decoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 811 of file flacdec.c.

ff_flac_decoder

const FFCodec ff_flac_decoder

Initial value:

= {
    .p.name         = "flac",
    CODEC_LONG_NAME("FLAC (Free Lossless Audio Codec)"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_FLAC,
    .priv_data_size = sizeof(FLACContext),
    .init           = flac_decode_init,
    .close          = flac_decode_close,
    FF_CODEC_DECODE_CB(flac_decode_frame),
    .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
                      AV_CODEC_CAP_DR1 |
                      AV_CODEC_CAP_FRAME_THREADS,
    CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,
                     AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P),
    .p.priv_class   = &flac_decoder_class,
}

Definition at line 818 of file flacdec.c.