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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 {
33  GetBitContext bits;
35  int size;
36  union {
37  uint64_t u64;
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 {
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 };
const char * s
Definition: avisynth_c.h:768
int codec_ids[5]
Definition: avcodec.h:5007
uint8_t
#define av_cold
Definition: attributes.h:82
int(* sync)(uint64_t state, struct AACAC3ParseContext *hdr_info, int *need_next_header, int *new_frame_start)
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_be2ne64(x)
Definition: bswap.h:94
#define AV_AAC_ADTS_HEADER_SIZE
Definition: adts_parser.h:25
uint8_t chan_config
Definition: adts_header.h:35
void ff_parse_close(AVCodecParserContext *s)
Definition: parser.c:329
static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info, int *need_next_header, int *new_frame_start)
Definition: aac_parser.c:30
static av_cold int aac_parse_init(AVCodecParserContext *s1)
Definition: aac_parser.c:56
uint32_t samples
Definition: adts_header.h:30
static struct @271 state
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
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:425
#define s1
Definition: regdef.h:38
uint32_t bit_rate
Definition: adts_header.h:31
int ff_aac_ac3_parse(AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:769
AVCodecParser ff_aac_parser
Definition: aac_parser.c:65
const uint8_t ff_mpeg4audio_channels[8]
Definition: mpeg4audio.c:67
uint32_t sample_rate
Definition: adts_header.h:29
static uint8_t tmp[11]
Definition: aes_ctr.c:26