libavcodec/ac3_parser.c File Reference

#include "parser.h"
#include "ac3_parser.h"
#include "aac_ac3_parser.h"
#include "get_bits.h"
#include "libavutil/audioconvert.h"

Go to the source code of this file.

Defines
#define	AC3_HEADER_SIZE   7
Functions
int	avpriv_ac3_parse_header (GetBitContext *gbc, AC3HeaderInfo *hdr)
	Parse AC-3 frame header.
static int	ac3_sync (uint64_t state, AACAC3ParseContext *hdr_info, int *need_next_header, int *new_frame_start)
static av_cold int	ac3_parse_init (AVCodecParserContext *s1)
Variables
static const uint8_t	eac3_blocks [4]
static const uint8_t	center_levels [4] = { 4, 5, 6, 5 }
	Table for center mix levels reference: Section 5.4.2.4 cmixlev.
static const uint8_t	surround_levels [4] = { 4, 6, 7, 6 }
	Table for surround mix levels reference: Section 5.4.2.5 surmixlev.
AVCodecParser	ff_ac3_parser

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Define Documentation

#define AC3_HEADER_SIZE   7

Definition at line 30 of file ac3_parser.c.

Referenced by ac3_parse_init(), ac3_sync(), and avpriv_ac3_parse_header().

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Function Documentation

static av_cold int ac3_parse_init

(

AVCodecParserContext *

s1

)

[static]

Definition at line 179 of file ac3_parser.c.

static int ac3_sync	(	uint64_t	state,
		AACAC3ParseContext *	hdr_info,
		int *	need_next_header,
		int *	new_frame_start
	)			[static]

Definition at line 144 of file ac3_parser.c.

Referenced by ac3_parse_init().

int avpriv_ac3_parse_header	(	GetBitContext *	gbc,
		AC3HeaderInfo *	hdr
	)

Parse AC-3 frame header.

Parse the header up to the lfeon element, which is the first 52 or 54 bits depending on the audio coding mode.

Parameters:

[in]	gbc	BitContext containing the first 54 bits of the frame.
[out]	hdr	Pointer to struct where header info is written.

Returns:

Returns 0 on success, -1 if there is a sync word mismatch, -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate) element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.

Definition at line 50 of file ac3_parser.c.

Referenced by ac3_eac3_probe(), ac3_sync(), and parse_frame_header().

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Variable Documentation

const uint8_t center_levels[4] = { 4, 5, 6, 5 } [static]

Table for center mix levels reference: Section 5.4.2.4 cmixlev.

Definition at line 41 of file ac3_parser.c.

Referenced by avpriv_ac3_parse_header().

const uint8_t eac3_blocks[4] [static]

Initial value:

 {
    1, 2, 3, 6
}

Definition at line 33 of file ac3_parser.c.

Referenced by avpriv_ac3_parse_header().

AVCodecParser ff_ac3_parser

Initial value:

 {
    .codec_ids      = { CODEC_ID_AC3, CODEC_ID_EAC3 },
    .priv_data_size = sizeof(AACAC3ParseContext),
    .parser_init    = ac3_parse_init,
    .parser_parse   = ff_aac_ac3_parse,
    .parser_close   = ff_parse_close,
}

Definition at line 188 of file ac3_parser.c.

const uint8_t surround_levels[4] = { 4, 6, 7, 6 } [static]

Table for surround mix levels reference: Section 5.4.2.5 surmixlev.

Definition at line 47 of file ac3_parser.c.

Referenced by avpriv_ac3_parse_header().