1 /*
2 * RAW PCM demuxers
3 * Copyright (c) 2002 Fabrice Bellard
4 * Copyright (c) 2022 Jack Bruienne
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 #include "libavutil/avstring.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "pcm.h"
27 #include "libavutil/log.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.h"
30
31 typedef struct DFPWMAudioDemuxerContext {
32 AVClass *class;
33 int sample_rate;
34 #if FF_API_OLD_CHANNEL_LAYOUT
35 int channels;
36 #endif
37 AVChannelLayout ch_layout;
38 } DFPWMAudioDemuxerContext;
39
dfpwm_read_header(AVFormatContext *s)40 static int dfpwm_read_header(AVFormatContext *s)
41 {
42 DFPWMAudioDemuxerContext *s1 = s->priv_data;
43 AVCodecParameters *par;
44 AVStream *st;
45 int ret;
46
47 st = avformat_new_stream(s, NULL);
48 if (!st)
49 return AVERROR(ENOMEM);
50 par = st->codecpar;
51
52 par->codec_type = AVMEDIA_TYPE_AUDIO;
53 par->codec_id = s->iformat->raw_codec_id;
54 par->sample_rate = s1->sample_rate;
55 #if FF_API_OLD_CHANNEL_LAYOUT
56 if (s1->ch_layout.nb_channels) {
57 #endif
58 ret = av_channel_layout_copy(&par->ch_layout, &s1->ch_layout);
59 if (ret < 0)
60 return ret;
61 #if FF_API_OLD_CHANNEL_LAYOUT
62 } else
63 par->ch_layout.nb_channels = s1->channels;
64 #endif
65 par->bits_per_coded_sample = 1;
66 par->block_align = 1;
67
68 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
69 return 0;
70 }
71
72 static const AVOption dfpwm_options[] = {
73 { "sample_rate", "", offsetof(DFPWMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
74 #if FF_API_OLD_CHANNEL_LAYOUT
75 { "channels", "", offsetof(DFPWMAudioDemuxerContext, channels), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_DEPRECATED },
76 { "ch_layout", "", offsetof(DFPWMAudioDemuxerContext, ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
77 #else
78 { "ch_layout", "", offsetof(DFPWMAudioDemuxerContext, ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = "mono"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
79 #endif
80 { NULL },
81 };
82 static const AVClass dfpwm_demuxer_class = {
83 .class_name = "dfpwm demuxer",
84 .item_name = av_default_item_name,
85 .option = dfpwm_options,
86 .version = LIBAVUTIL_VERSION_INT,
87 };
88
89 const AVInputFormat ff_dfpwm_demuxer = {
90 .name = "dfpwm",
91 .long_name = NULL_IF_CONFIG_SMALL("raw DFPWM1a"),
92 .priv_data_size = sizeof(DFPWMAudioDemuxerContext),
93 .read_header = dfpwm_read_header,
94 .read_packet = ff_pcm_read_packet,
95 .read_seek = ff_pcm_read_seek,
96 .flags = AVFMT_GENERIC_INDEX,
97 .extensions = "dfpwm",
98 .raw_codec_id = AV_CODEC_ID_DFPWM,
99 .priv_class = &dfpwm_demuxer_class,
100 };
101