2 * sndio play and grab interface
3 * Copyright (c) 2010 Jacob Meuser
5 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavformat/avformat.h"
26 #include "libavutil/opt.h"
28 #include "sndio_common.h"
30 static av_cold int audio_read_header(AVFormatContext *s1,
31 AVFormatParameters *ap)
33 SndioData *s = s1->priv_data;
37 #if FF_API_FORMAT_PARAMETERS
38 if (ap->sample_rate > 0)
39 s->sample_rate = ap->sample_rate;
41 s->channels = ap->channels;
44 st = av_new_stream(s1, 0);
46 return AVERROR(ENOMEM);
48 ret = ff_sndio_open(s1, 0, s1->filename);
52 /* take real parameters */
53 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
54 st->codec->codec_id = s->codec_id;
55 st->codec->sample_rate = s->sample_rate;
56 st->codec->channels = s->channels;
58 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
63 static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
65 SndioData *s = s1->priv_data;
66 int64_t bdelay, cur_time;
69 if ((ret = av_new_packet(pkt, s->buffer_size)) < 0)
72 ret = sio_read(s->hdl, pkt->data, pkt->size);
73 if (ret == 0 || sio_eof(s->hdl)) {
81 /* compute pts of the start of the packet */
82 cur_time = av_gettime();
84 bdelay = ret + s->hwpos - s->softpos;
87 pkt->pts = cur_time - ((bdelay * 1000000) /
88 (s->bps * s->channels * s->sample_rate));
93 static av_cold int audio_read_close(AVFormatContext *s1)
95 SndioData *s = s1->priv_data;
102 static const AVOption options[] = {
103 { "sample_rate", "", offsetof(SndioData, sample_rate), FF_OPT_TYPE_INT, {.dbl = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
104 { "channels", "", offsetof(SndioData, channels), FF_OPT_TYPE_INT, {.dbl = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
108 static const AVClass sndio_demuxer_class = {
109 .class_name = "sndio indev",
110 .item_name = av_default_item_name,
112 .version = LIBAVUTIL_VERSION_INT,
115 AVInputFormat ff_sndio_demuxer = {
117 .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"),
118 .priv_data_size = sizeof(SndioData),
119 .read_header = audio_read_header,
120 .read_packet = audio_read_packet,
121 .read_close = audio_read_close,
122 .flags = AVFMT_NOFILE,
123 .priv_class = &sndio_demuxer_class,