Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavdevice / sndio_dec.c
1 /*
2 * sndio play and grab interface
3 * Copyright (c) 2010 Jacob Meuser
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 <stdint.h>
23 #include <sndio.h>
24
25 #include "libavformat/avformat.h"
26 #include "libavformat/internal.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/time.h"
29
30 #include "sndio_common.h"
31
32 static av_cold int audio_read_header(AVFormatContext *s1)
33 {
34 SndioData *s = s1->priv_data;
35 AVStream *st;
36 int ret;
37
38 st = avformat_new_stream(s1, NULL);
39 if (!st)
40 return AVERROR(ENOMEM);
41
42 ret = ff_sndio_open(s1, 0, s1->filename);
43 if (ret < 0)
44 return ret;
45
46 /* take real parameters */
47 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
48 st->codec->codec_id = s->codec_id;
49 st->codec->sample_rate = s->sample_rate;
50 st->codec->channels = s->channels;
51
52 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
53
54 return 0;
55 }
56
57 static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
58 {
59 SndioData *s = s1->priv_data;
60 int64_t bdelay, cur_time;
61 int ret;
62
63 if ((ret = av_new_packet(pkt, s->buffer_size)) < 0)
64 return ret;
65
66 ret = sio_read(s->hdl, pkt->data, pkt->size);
67 if (ret == 0 || sio_eof(s->hdl)) {
68 av_free_packet(pkt);
69 return AVERROR_EOF;
70 }
71
72 pkt->size = ret;
73 s->softpos += ret;
74
75 /* compute pts of the start of the packet */
76 cur_time = av_gettime();
77
78 bdelay = ret + s->hwpos - s->softpos;
79
80 /* convert to pts */
81 pkt->pts = cur_time - ((bdelay * 1000000) /
82 (s->bps * s->channels * s->sample_rate));
83
84 return 0;
85 }
86
87 static av_cold int audio_read_close(AVFormatContext *s1)
88 {
89 SndioData *s = s1->priv_data;
90
91 ff_sndio_close(s);
92
93 return 0;
94 }
95
96 static const AVOption options[] = {
97 { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
98 { "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
99 { NULL },
100 };
101
102 static const AVClass sndio_demuxer_class = {
103 .class_name = "sndio indev",
104 .item_name = av_default_item_name,
105 .option = options,
106 .version = LIBAVUTIL_VERSION_INT,
107 .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
108 };
109
110 AVInputFormat ff_sndio_demuxer = {
111 .name = "sndio",
112 .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"),
113 .priv_data_size = sizeof(SndioData),
114 .read_header = audio_read_header,
115 .read_packet = audio_read_packet,
116 .read_close = audio_read_close,
117 .flags = AVFMT_NOFILE,
118 .priv_class = &sndio_demuxer_class,
119 };