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"
29 static int adts_aac_probe(AVProbeData *p)
31 int max_frames = 0, first_frames = 0;
33 uint8_t *buf0 = p->buf;
36 uint8_t *end = buf0 + p->buf_size - 7;
40 for(; buf < end; buf= buf2+1) {
43 for(frames = 0; buf2 < end; frames++) {
44 uint32_t header = AV_RB16(buf2);
45 if((header&0xFFF6) != 0xFFF0)
47 fsize = (AV_RB32(buf2+3)>>13) & 0x8FFF;
52 max_frames = FFMAX(max_frames, frames);
56 if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
57 else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
58 else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
59 else if(max_frames>=1) return 1;
63 static int adts_aac_read_header(AVFormatContext *s,
64 AVFormatParameters *ap)
68 st = av_new_stream(s, 0);
70 return AVERROR(ENOMEM);
72 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
73 st->codec->codec_id = s->iformat->value;
74 st->need_parsing = AVSTREAM_PARSE_FULL;
78 //LCM of all possible ADTS sample rates
79 av_set_pts_info(st, 64, 1, 28224000);
84 AVInputFormat ff_aac_demuxer = {
86 NULL_IF_CONFIG_SMALL("raw ADTS AAC"),
90 ff_raw_read_partial_packet,
91 .flags= AVFMT_GENERIC_INDEX,
93 .value = CODEC_ID_AAC,