2 * MLP and TrueHD demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2005 Alex Beregszaszi
5 * Copyright (c) 2015 Carl Eugen Hoyos
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/intreadwrite.h"
28 static int av_always_inline mlp_thd_probe(AVProbeData *p, uint32_t sync)
30 const uint8_t *buf, *last_buf = p->buf, *end = p->buf + p->buf_size;
31 int frames = 0, valid = 0, size = 0;
33 for (buf = p->buf; buf + 8 <= end; buf++) {
34 if (AV_RB32(buf + 4) == sync) {
36 if (last_buf + size == buf) {
40 size = (AV_RB16(buf) & 0xfff) * 2;
41 } else if (buf - last_buf == size) {
42 size += (AV_RB16(buf) & 0xfff) * 2;
46 return AVPROBE_SCORE_MAX;
50 #if CONFIG_MLP_DEMUXER
51 static int mlp_probe(AVProbeData *p)
53 return mlp_thd_probe(p, 0xf8726fbb);
56 AVInputFormat ff_mlp_demuxer = {
58 .long_name = NULL_IF_CONFIG_SMALL("raw MLP"),
59 .read_probe = mlp_probe,
60 .read_header = ff_raw_audio_read_header,
61 .read_packet = ff_raw_read_partial_packet,
62 .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
64 .raw_codec_id = AV_CODEC_ID_MLP,
68 #if CONFIG_TRUEHD_DEMUXER
69 static int thd_probe(AVProbeData *p)
71 return mlp_thd_probe(p, 0xf8726fba);
74 AVInputFormat ff_truehd_demuxer = {
76 .long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"),
77 .read_probe = thd_probe,
78 .read_header = ff_raw_audio_read_header,
79 .read_packet = ff_raw_read_partial_packet,
80 .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
82 .raw_codec_id = AV_CODEC_ID_TRUEHD,