1/*
2 * sndio play and grab interface
3 * Copyright (c) 2010 Jacob Meuser
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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
29#include "sndio_common.h"
30
31static av_cold int audio_read_header(AVFormatContext *s1,
32                                     AVFormatParameters *ap)
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
57static 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
87static 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
96static const AVOption options[] = {
97    { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.dbl = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
98    { "channels",    "", offsetof(SndioData, channels),    AV_OPT_TYPE_INT, {.dbl = 2},     1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
99    { NULL },
100};
101
102static 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};
108
109AVInputFormat ff_sndio_demuxer = {
110    .name           = "sndio",
111    .long_name      = NULL_IF_CONFIG_SMALL("sndio audio capture"),
112    .priv_data_size = sizeof(SndioData),
113    .read_header    = audio_read_header,
114    .read_packet    = audio_read_packet,
115    .read_close     = audio_read_close,
116    .flags          = AVFMT_NOFILE,
117    .priv_class     = &sndio_demuxer_class,
118};
119