mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.7 KiB
96 lines
2.7 KiB
/* |
|
* raw ADTS AAC demuxer |
|
* Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> |
|
* Copyright (c) 2009 Robert Swain ( rob opendot cl ) |
|
* |
|
* 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 "libavutil/intreadwrite.h" |
|
#include "avformat.h" |
|
#include "rawdec.h" |
|
#include "id3v2.h" |
|
#include "id3v1.h" |
|
|
|
|
|
static int adts_aac_probe(AVProbeData *p) |
|
{ |
|
int max_frames = 0, first_frames = 0; |
|
int fsize, frames; |
|
uint8_t *buf0 = p->buf; |
|
uint8_t *buf2; |
|
uint8_t *buf; |
|
uint8_t *end = buf0 + p->buf_size - 7; |
|
|
|
if (ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC)) { |
|
buf0 += ff_id3v2_tag_len(buf0); |
|
} |
|
buf = buf0; |
|
|
|
for(; buf < end; buf= buf2+1) { |
|
buf2 = buf; |
|
|
|
for(frames = 0; buf2 < end; frames++) { |
|
uint32_t header = AV_RB16(buf2); |
|
if((header&0xFFF6) != 0xFFF0) |
|
break; |
|
fsize = (AV_RB32(buf2+3)>>13) & 0x8FFF; |
|
if(fsize < 7) |
|
break; |
|
buf2 += fsize; |
|
} |
|
max_frames = FFMAX(max_frames, frames); |
|
if(buf == buf0) |
|
first_frames= frames; |
|
} |
|
if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1; |
|
else if(max_frames>500)return AVPROBE_SCORE_MAX/2; |
|
else if(max_frames>=3) return AVPROBE_SCORE_MAX/4; |
|
else if(max_frames>=1) return 1; |
|
else return 0; |
|
} |
|
|
|
static int adts_aac_read_header(AVFormatContext *s, |
|
AVFormatParameters *ap) |
|
{ |
|
AVStream *st; |
|
|
|
st = av_new_stream(s, 0); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codec->codec_id = s->iformat->value; |
|
st->need_parsing = AVSTREAM_PARSE_FULL; |
|
|
|
ff_id3v1_read(s); |
|
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC); |
|
|
|
return 0; |
|
} |
|
|
|
AVInputFormat aac_demuxer = { |
|
"aac", |
|
NULL_IF_CONFIG_SMALL("raw ADTS AAC"), |
|
0, |
|
adts_aac_probe, |
|
adts_aac_read_header, |
|
ff_raw_read_partial_packet, |
|
.flags= AVFMT_GENERIC_INDEX, |
|
.extensions = "aac", |
|
.value = CODEC_ID_AAC, |
|
};
|
|
|