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.
106 lines
3.1 KiB
106 lines
3.1 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 "internal.h" |
|
#include "rawdec.h" |
|
#include "id3v1.h" |
|
#include "apetag.h" |
|
|
|
static int adts_aac_probe(AVProbeData *p) |
|
{ |
|
int max_frames = 0, first_frames = 0; |
|
int fsize, frames; |
|
const uint8_t *buf0 = p->buf; |
|
const uint8_t *buf2; |
|
const uint8_t *buf; |
|
const uint8_t *end = buf0 + p->buf_size - 7; |
|
|
|
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) & 0x1FFF; |
|
if (fsize < 7) |
|
break; |
|
fsize = FFMIN(fsize, end - buf2); |
|
buf2 += fsize; |
|
} |
|
max_frames = FFMAX(max_frames, frames); |
|
if (buf == buf0) |
|
first_frames = frames; |
|
} |
|
|
|
if (first_frames >= 3) |
|
return AVPROBE_SCORE_EXTENSION + 1; |
|
else if (max_frames > 500) |
|
return AVPROBE_SCORE_EXTENSION; |
|
else if (max_frames >= 3) |
|
return AVPROBE_SCORE_EXTENSION / 2; |
|
else if (max_frames >= 1) |
|
return 1; |
|
else |
|
return 0; |
|
} |
|
|
|
static int adts_aac_read_header(AVFormatContext *s) |
|
{ |
|
AVStream *st; |
|
|
|
st = avformat_new_stream(s, NULL); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
st->codec->codec_id = s->iformat->raw_codec_id; |
|
st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
|
|
|
ff_id3v1_read(s); |
|
if (s->pb->seekable && |
|
!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) { |
|
int64_t cur = avio_tell(s->pb); |
|
ff_ape_parse_tag(s); |
|
avio_seek(s->pb, cur, SEEK_SET); |
|
} |
|
|
|
// LCM of all possible ADTS sample rates |
|
avpriv_set_pts_info(st, 64, 1, 28224000); |
|
|
|
return 0; |
|
} |
|
|
|
AVInputFormat ff_aac_demuxer = { |
|
.name = "aac", |
|
.long_name = NULL_IF_CONFIG_SMALL("raw ADTS AAC (Advanced Audio Coding)"), |
|
.read_probe = adts_aac_probe, |
|
.read_header = adts_aac_read_header, |
|
.read_packet = ff_raw_read_partial_packet, |
|
.flags = AVFMT_GENERIC_INDEX, |
|
.extensions = "aac", |
|
.raw_codec_id = AV_CODEC_ID_AAC, |
|
};
|
|
|