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2ba45a60 DM |
1 | /* |
2 | * Ensoniq Paris Audio File demuxer | |
3 | * Copyright (c) 2012 Paul B Mahol | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "libavutil/intreadwrite.h" | |
23 | #include "avformat.h" | |
24 | #include "internal.h" | |
25 | #include "pcm.h" | |
26 | ||
27 | static int epaf_probe(AVProbeData *p) | |
28 | { | |
29 | if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') && | |
30 | AV_RL32(p->buf + 8) == 1) || | |
31 | (AV_RL32(p->buf) == MKTAG(' ','p','a','f') && | |
32 | AV_RN32(p->buf + 8) == 0)) && | |
33 | !AV_RN32(p->buf + 4) && AV_RN32(p->buf + 12) && | |
34 | AV_RN32(p->buf + 20)) | |
35 | return AVPROBE_SCORE_MAX / 4 * 3; | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static int epaf_read_header(AVFormatContext *s) | |
40 | { | |
41 | int le, sample_rate, codec, channels; | |
42 | AVStream *st; | |
43 | ||
44 | avio_skip(s->pb, 4); | |
45 | if (avio_rl32(s->pb)) | |
46 | return AVERROR_INVALIDDATA; | |
47 | ||
48 | le = avio_rl32(s->pb); | |
49 | if (le && le != 1) | |
50 | return AVERROR_INVALIDDATA; | |
51 | ||
52 | if (le) { | |
53 | sample_rate = avio_rl32(s->pb); | |
54 | codec = avio_rl32(s->pb); | |
55 | channels = avio_rl32(s->pb); | |
56 | } else { | |
57 | sample_rate = avio_rb32(s->pb); | |
58 | codec = avio_rb32(s->pb); | |
59 | channels = avio_rb32(s->pb); | |
60 | } | |
61 | ||
62 | if (!channels || !sample_rate) | |
63 | return AVERROR_INVALIDDATA; | |
64 | ||
65 | st = avformat_new_stream(s, NULL); | |
66 | if (!st) | |
67 | return AVERROR(ENOMEM); | |
68 | ||
69 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
70 | st->codec->channels = channels; | |
71 | st->codec->sample_rate = sample_rate; | |
72 | switch (codec) { | |
73 | case 0: | |
74 | st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE; | |
75 | break; | |
76 | case 2: | |
77 | st->codec->codec_id = AV_CODEC_ID_PCM_S8; | |
78 | break; | |
79 | case 1: | |
80 | avpriv_request_sample(s, "24-bit Paris PCM format"); | |
81 | default: | |
82 | return AVERROR_INVALIDDATA; | |
83 | } | |
84 | ||
85 | st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id); | |
86 | st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; | |
87 | ||
88 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
89 | ||
90 | if (avio_skip(s->pb, 2024) < 0) | |
91 | return AVERROR_INVALIDDATA; | |
92 | return 0; | |
93 | } | |
94 | ||
95 | AVInputFormat ff_epaf_demuxer = { | |
96 | .name = "epaf", | |
97 | .long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"), | |
98 | .read_probe = epaf_probe, | |
99 | .read_header = epaf_read_header, | |
100 | .read_packet = ff_pcm_read_packet, | |
101 | .read_seek = ff_pcm_read_seek, | |
102 | .extensions = "paf,fap", | |
103 | .flags = AVFMT_GENERIC_INDEX, | |
104 | }; |