libavcodec/flacdec.c File Reference

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

#include <limits.h>
#include "libavutil/audioconvert.h"
#include "libavutil/avassert.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 void	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
static const int64_t	flac_channel_layouts [6]
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 void allocate_buffers

(

FLACContext *

s

)

[static]

Definition at line 138 of file flacdec.c.

static int decode_frame

(

FLACContext *

s

)

[static]

Definition at line 404 of file flacdec.c.

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	(	FLACContext *	s,
		int	channel
	)			[inline, static]

Definition at line 335 of file 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 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(), and shorten_decode_frame().

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

Definition at line 129 of file flacdec.c.

Referenced by decode_frame().

static av_cold int flac_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 550 of file flacdec.c.

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

Definition at line 485 of file flacdec.c.

static av_cold int flac_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 98 of file flacdec.c.

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().

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 184 of file 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:

	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 156 of file flacdec.c.

Referenced by flac_decode_frame().

---

Variable Documentation

AVCodec ff_flac_decoder

Initial value:

 {
    .name           = "flac",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_FLAC,
    .priv_data_size = sizeof(FLACContext),
    .init           = flac_decode_init,
    .close          = flac_decode_close,
    .decode         = flac_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
                                                      AV_SAMPLE_FMT_S16P,
                                                      AV_SAMPLE_FMT_S32,
                                                      AV_SAMPLE_FMT_S32P,
                                                      -1 },
}

Definition at line 562 of file flacdec.c.

const int64_t flac_channel_layouts[6] [static]

Initial value:

 {
    AV_CH_LAYOUT_MONO,
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_SURROUND,
    AV_CH_LAYOUT_QUAD,
    AV_CH_LAYOUT_5POINT0,
    AV_CH_LAYOUT_5POINT1
}

Definition at line 65 of file flacdec.c.

Referenced by flac_decode_init().