0,0 → 1,69 |
/* |
* Audio and Video frame extraction |
* Copyright (c) 2003 Fabrice Bellard |
* Copyright (c) 2003 Michael Niedermayer |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include "parser.h" |
#include "aac_ac3_parser.h" |
#include "aacadtsdec.h" |
#include "get_bits.h" |
#include "mpeg4audio.h" |
|
static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info, |
int *need_next_header, int *new_frame_start) |
{ |
GetBitContext bits; |
AACADTSHeaderInfo hdr; |
int size; |
union { |
uint64_t u64; |
uint8_t u8[8]; |
} tmp; |
|
tmp.u64 = av_be2ne64(state); |
init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8); |
|
if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0) |
return 0; |
*need_next_header = 0; |
*new_frame_start = 1; |
hdr_info->sample_rate = hdr.sample_rate; |
hdr_info->channels = ff_mpeg4audio_channels[hdr.chan_config]; |
hdr_info->samples = hdr.samples; |
hdr_info->bit_rate = hdr.bit_rate; |
return size; |
} |
|
static av_cold int aac_parse_init(AVCodecParserContext *s1) |
{ |
AACAC3ParseContext *s = s1->priv_data; |
s->header_size = AAC_ADTS_HEADER_SIZE; |
s->sync = aac_sync; |
return 0; |
} |
|
|
AVCodecParser ff_aac_parser = { |
.codec_ids = { AV_CODEC_ID_AAC }, |
.priv_data_size = sizeof(AACAC3ParseContext), |
.parser_init = aac_parse_init, |
.parser_parse = ff_aac_ac3_parse, |
.parser_close = ff_parse_close, |
}; |