FFmpeg
aac_parser.c
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1 /*
2  * Audio and Video frame extraction
3  * Copyright (c) 2003 Fabrice Bellard
4  * Copyright (c) 2003 Michael Niedermayer
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "parser.h"
24 #include "aac_ac3_parser.h"
25 #include "adts_header.h"
26 #include "adts_parser.h"
27 #include "get_bits.h"
28 #include "mpeg4audio.h"
29 
30 static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
31  int *need_next_header, int *new_frame_start)
32 {
35  int size;
36  union {
37  uint64_t u64;
38  uint8_t u8[8 + AV_INPUT_BUFFER_PADDING_SIZE];
39  } tmp;
40 
41  tmp.u64 = av_be2ne64(state);
44 
45  if ((size = ff_adts_header_parse(&bits, &hdr)) < 0)
46  return 0;
47  *need_next_header = 0;
48  *new_frame_start = 1;
49  hdr_info->sample_rate = hdr.sample_rate;
51  hdr_info->samples = hdr.samples;
52  hdr_info->bit_rate = hdr.bit_rate;
53  return size;
54 }
55 
57 {
58  AACAC3ParseContext *s = s1->priv_data;
59  s->header_size = AV_AAC_ADTS_HEADER_SIZE;
60  s->sync = aac_sync;
61  return 0;
62 }
63 
64 
67  .priv_data_size = sizeof(AACAC3ParseContext),
68  .parser_init = aac_parse_init,
69  .parser_parse = ff_aac_ac3_parse,
70  .parser_close = ff_parse_close,
71 };
ff_aac_parser
const AVCodecParser ff_aac_parser
Definition: aac_parser.c:65
AV_AAC_ADTS_HEADER_SIZE
#define AV_AAC_ADTS_HEADER_SIZE
Definition: adts_parser.h:25
aac_ac3_parser.h
av_be2ne64
#define av_be2ne64(x)
Definition: bswap.h:94
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:26
ff_parse_close
void ff_parse_close(AVCodecParserContext *s)
Definition: parser.c:286
AACADTSHeaderInfo::samples
uint32_t samples
Definition: adts_header.h:30
AACADTSHeaderInfo::bit_rate
uint32_t bit_rate
Definition: adts_header.h:31
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:660
mpeg4audio.h
ff_adts_header_parse
int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
Parse the ADTS frame header to the end of the variable header, which is the first 54 bits.
Definition: adts_header.c:30
GetBitContext
Definition: get_bits.h:62
AACADTSHeaderInfo::chan_config
uint8_t chan_config
Definition: adts_header.h:35
av_cold
#define av_cold
Definition: attributes.h:90
s
#define s(width, name)
Definition: cbs_vp9.c:257
s1
#define s1
Definition: regdef.h:38
bits
uint8_t bits
Definition: vp3data.h:141
get_bits.h
ff_aac_ac3_parse
int ff_aac_ac3_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: aac_ac3_parser.c:28
AACAC3ParseContext::sample_rate
int sample_rate
Definition: aac_ac3_parser.h:48
ff_mpeg4audio_channels
const uint8_t ff_mpeg4audio_channels[14]
Definition: mpeg4audio.c:67
state
static struct @317 state
AACAC3ParseContext
Definition: aac_ac3_parser.h:40
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:424
AVCodecParser::codec_ids
int codec_ids[7]
Definition: avcodec.h:2930
size
int size
Definition: twinvq_data.h:10344
aac_sync
static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info, int *need_next_header, int *new_frame_start)
Definition: aac_parser.c:30
AACAC3ParseContext::channels
int channels
Definition: aac_ac3_parser.h:47
parser.h
AACADTSHeaderInfo::sample_rate
uint32_t sample_rate
Definition: adts_header.h:29
AVCodecParserContext
Definition: avcodec.h:2770
adts_parser.h
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
aac_parse_init
static av_cold int aac_parse_init(AVCodecParserContext *s1)
Definition: aac_parser.c:56
adts_header.h
AVCodecParser
Definition: avcodec.h:2929
AACAC3ParseContext::samples
int samples
Definition: aac_ac3_parser.h:50
AACAC3ParseContext::bit_rate
int bit_rate
Definition: aac_ac3_parser.h:49
AACADTSHeaderInfo
Definition: adts_header.h:28