3 * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2009 Robert Swain ( rob opendot cl )
6 * This file is part of FFmpeg.
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.
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.
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
23 #include "libavutil/intreadwrite.h"
30 static int adts_aac_probe(AVProbeData *p)
32 int max_frames = 0, first_frames = 0;
34 uint8_t *buf0 = p->buf;
37 uint8_t *end = buf0 + p->buf_size - 7;
39 if (ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC)) {
40 buf0 += ff_id3v2_tag_len(buf0);
44 for(; buf < end; buf= buf2+1) {
47 for(frames = 0; buf2 < end; frames++) {
48 uint32_t header = AV_RB16(buf2);
49 if((header&0xFFF6) != 0xFFF0)
51 fsize = (AV_RB32(buf2+3)>>13) & 0x8FFF;
56 max_frames = FFMAX(max_frames, frames);
60 if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
61 else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
62 else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
63 else if(max_frames>=1) return 1;
67 static int adts_aac_read_header(AVFormatContext *s,
68 AVFormatParameters *ap)
72 st = av_new_stream(s, 0);
74 return AVERROR(ENOMEM);
76 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
77 st->codec->codec_id = s->iformat->value;
78 st->need_parsing = AVSTREAM_PARSE_FULL;
81 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC);
86 AVInputFormat aac_demuxer = {
88 NULL_IF_CONFIG_SMALL("raw ADTS AAC"),
92 ff_raw_read_partial_packet,
93 .flags= AVFMT_GENERIC_INDEX,
95 .value = CODEC_ID_AAC,