mpeg4audio.c File Reference

#include "get_bits.h"
#include "mpeg4audio.h"

Go to the source code of this file.

Functions
static int	parse_config_ALS (GetBitContext *gb, MPEG4AudioConfig *c, void *logctx)
	Parse MPEG-4 audio configuration for ALS object type. More...
static int	get_object_type (GetBitContext *gb)
static int	get_sample_rate (GetBitContext *gb, int *index)
int	ff_mpeg4audio_get_config_gb (MPEG4AudioConfig *c, GetBitContext *gb, int sync_extension, void *logctx)
	Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration. More...
int	avpriv_mpeg4audio_get_config2 (MPEG4AudioConfig *c, const uint8_t *buf, int size, int sync_extension, void *logctx)
	Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. More...

Variables
const uint8_t	ff_mpeg4audio_channels [15]

Function Documentation

parse_config_ALS()

static int parse_config_ALS ( GetBitContext *  gb, MPEG4AudioConfig *  c, void *  logctx  )

static

Parse MPEG-4 audio configuration for ALS object type.

Parameters

[in]	gb	bit reader context
[in]	c	MPEG4AudioConfig structure to fill

Returns

on success 0 is returned, otherwise a value < 0

Definition at line 32 of file mpeg4audio.c.

Referenced by ff_mpeg4audio_get_config_gb().

get_object_type()

static int get_object_type ( GetBitContext *  gb )

inlinestatic

Definition at line 77 of file mpeg4audio.c.

Referenced by ff_mpeg4audio_get_config_gb().

get_sample_rate()

static int get_sample_rate ( GetBitContext *  gb, int *  index  )

inlinestatic

Definition at line 85 of file mpeg4audio.c.

Referenced by ff_mpeg4audio_get_config_gb().

ff_mpeg4audio_get_config_gb()

int ff_mpeg4audio_get_config_gb	(	MPEG4AudioConfig *	c,
		GetBitContext *	gb,
		int	sync_extension,
		void *	logctx
	)

Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration.

Parameters

[in]	c	MPEG4AudioConfig structure to fill.
[in]	gb	Extradata from container.
[in]	sync_extension	look for a sync extension after config if true.
[in]	logctx	opaque struct starting with an AVClass element, used for logging.

Returns

negative AVERROR code on error, on success AudioSpecificConfig bit index in extradata.

Definition at line 92 of file mpeg4audio.c.

Referenced by avpriv_mpeg4audio_get_config2(), and decode_audio_specific_config_gb().

avpriv_mpeg4audio_get_config2()

int avpriv_mpeg4audio_get_config2	(	MPEG4AudioConfig *	c,
		const uint8_t *	buf,
		int	size,
		int	sync_extension,
		void *	logctx
	)

Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.

Parameters

[in]	c	MPEG4AudioConfig structure to fill.
[in]	buf	Extradata from container.
[in]	size	Extradata size in bytes.
[in]	sync_extension	look for a sync extension after config if true.
[in]	logctx	opaque struct starting with an AVClass element, used for logging.

Returns

negative AVERROR code on error, AudioSpecificConfig bit index in extradata on success.

Definition at line 165 of file mpeg4audio.c.

Referenced by aac_adtstoasc_init(), aac_decoder_config(), adts_decode_extradata(), ff_mp4_read_dec_config_descr(), latm_decode_extradata(), and read_specific_config().

Variable Documentation

ff_mpeg4audio_channels

const uint8_t ff_mpeg4audio_channels[15]

Initial value:

= {
    0,
    1, 
    2, 
    3, 
    4, 
    5, 
    6, 
    8, 
    0,
    0,
    0,
    7, 
    8, 
    24, 
    8, 
}

Definition at line 59 of file mpeg4audio.c.

Referenced by aac_decode_init(), ff_mpeg4audio_get_config_gb(), and ftr_parse().