1 /*
2 * MLP and TrueHD demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2005 Alex Beregszaszi
5 * Copyright (c) 2015 Carl Eugen Hoyos
6 *
7 * This file is part of FFmpeg.
8 *
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.
13 *
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.
18 *
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
22 */
23
24 #include "avformat.h"
25 #include "rawdec.h"
26 #include "libavutil/intreadwrite.h"
27
mlp_thd_probe(const AVProbeData * p,uint32_t sync)28 static int av_always_inline mlp_thd_probe(const AVProbeData *p, uint32_t sync)
29 {
30 const uint8_t *buf, *last_buf = p->buf, *end = p->buf + p->buf_size;
31 int frames = 0, valid = 0, size = 0;
32 int nsubframes = 0;
33
34 for (buf = p->buf; buf + 8 <= end; buf++) {
35 if (AV_RB32(buf + 4) == sync) {
36 frames++;
37 if (last_buf + size == buf) {
38 valid += 1 + nsubframes / 8;
39 }
40 nsubframes = 0;
41 last_buf = buf;
42 size = (AV_RB16(buf) & 0xfff) * 2;
43 } else if (buf - last_buf == size) {
44 nsubframes++;
45 size += (AV_RB16(buf) & 0xfff) * 2;
46 }
47 }
48 if (valid >= 100)
49 return AVPROBE_SCORE_MAX;
50 return 0;
51 }
52
53 #if CONFIG_MLP_DEMUXER
mlp_probe(const AVProbeData * p)54 static int mlp_probe(const AVProbeData *p)
55 {
56 return mlp_thd_probe(p, 0xf8726fbb);
57 }
58
59 FF_RAW_DEMUXER_CLASS(mlp)
60 AVInputFormat ff_mlp_demuxer = {
61 .name = "mlp",
62 .long_name = NULL_IF_CONFIG_SMALL("raw MLP"),
63 .read_probe = mlp_probe,
64 .read_header = ff_raw_audio_read_header,
65 .read_packet = ff_raw_read_partial_packet,
66 .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
67 .extensions = "mlp",
68 .raw_codec_id = AV_CODEC_ID_MLP,
69 .priv_data_size = sizeof(FFRawDemuxerContext),
70 .priv_class = &mlp_demuxer_class,
71 };
72 #endif
73
74 #if CONFIG_TRUEHD_DEMUXER
thd_probe(const AVProbeData * p)75 static int thd_probe(const AVProbeData *p)
76 {
77 return mlp_thd_probe(p, 0xf8726fba);
78 }
79
80 FF_RAW_DEMUXER_CLASS(truehd)
81 AVInputFormat ff_truehd_demuxer = {
82 .name = "truehd",
83 .long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"),
84 .read_probe = thd_probe,
85 .read_header = ff_raw_audio_read_header,
86 .read_packet = ff_raw_read_partial_packet,
87 .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
88 .extensions = "thd",
89 .raw_codec_id = AV_CODEC_ID_TRUEHD,
90 .priv_data_size = sizeof(FFRawDemuxerContext),
91 .priv_class = &truehd_demuxer_class,
92 };
93 #endif
94
95