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2ba45a60 DM |
1 | /* |
2 | * PVF 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 "avformat.h" | |
23 | #include "internal.h" | |
24 | #include "pcm.h" | |
25 | ||
26 | static int pvf_probe(AVProbeData *p) | |
27 | { | |
28 | if (!memcmp(p->buf, "PVF1\n", 5)) | |
29 | return AVPROBE_SCORE_MAX; | |
30 | return 0; | |
31 | } | |
32 | ||
33 | static int pvf_read_header(AVFormatContext *s) | |
34 | { | |
35 | char buffer[32]; | |
36 | AVStream *st; | |
37 | int bps, channels, sample_rate; | |
38 | ||
39 | avio_skip(s->pb, 5); | |
40 | ff_get_line(s->pb, buffer, sizeof(buffer)); | |
41 | if (sscanf(buffer, "%d %d %d", | |
42 | &channels, | |
43 | &sample_rate, | |
44 | &bps) != 3) | |
45 | return AVERROR_INVALIDDATA; | |
46 | ||
47 | if (channels <= 0 || bps <= 0 || sample_rate <= 0) | |
48 | return AVERROR_INVALIDDATA; | |
49 | ||
50 | st = avformat_new_stream(s, NULL); | |
51 | if (!st) | |
52 | return AVERROR(ENOMEM); | |
53 | ||
54 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
55 | st->codec->channels = channels; | |
56 | st->codec->sample_rate = sample_rate; | |
57 | st->codec->codec_id = ff_get_pcm_codec_id(bps, 0, 1, 0xFFFF); | |
58 | st->codec->bits_per_coded_sample = bps; | |
59 | st->codec->block_align = bps * st->codec->channels / 8; | |
60 | ||
61 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | AVInputFormat ff_pvf_demuxer = { | |
67 | .name = "pvf", | |
68 | .long_name = NULL_IF_CONFIG_SMALL("PVF (Portable Voice Format)"), | |
69 | .read_probe = pvf_probe, | |
70 | .read_header = pvf_read_header, | |
71 | .read_packet = ff_pcm_read_packet, | |
72 | .read_seek = ff_pcm_read_seek, | |
73 | .extensions = "pvf", | |
74 | .flags = AVFMT_GENERIC_INDEX, | |
75 | }; |