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 "avdevice.h"
26#include "sndio_common.h"
27
28static av_cold int audio_write_header(AVFormatContext *s1)
29{
30    SndioData *s = s1->priv_data;
31    AVStream *st;
32    int ret;
33
34    st             = s1->streams[0];
35    s->sample_rate = st->codec->sample_rate;
36    s->channels    = st->codec->channels;
37
38    ret = ff_sndio_open(s1, 1, s1->filename);
39
40    return ret;
41}
42
43static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
44{
45    SndioData *s = s1->priv_data;
46    uint8_t *buf= pkt->data;
47    int size = pkt->size;
48    int len, ret;
49
50    while (size > 0) {
51        len = FFMIN(s->buffer_size - s->buffer_offset, size);
52        memcpy(s->buffer + s->buffer_offset, buf, len);
53        buf  += len;
54        size -= len;
55        s->buffer_offset += len;
56        if (s->buffer_offset >= s->buffer_size) {
57            ret = sio_write(s->hdl, s->buffer, s->buffer_size);
58            if (ret == 0 || sio_eof(s->hdl))
59                return AVERROR(EIO);
60            s->softpos      += ret;
61            s->buffer_offset = 0;
62        }
63    }
64
65    return 0;
66}
67
68static int audio_write_trailer(AVFormatContext *s1)
69{
70    SndioData *s = s1->priv_data;
71
72    sio_write(s->hdl, s->buffer, s->buffer_offset);
73
74    ff_sndio_close(s);
75
76    return 0;
77}
78
79static const AVClass sndio_muxer_class = {
80    .class_name     = "sndio outdev",
81    .item_name      = av_default_item_name,
82    .version        = LIBAVUTIL_VERSION_INT,
83    .category       = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
84};
85
86AVOutputFormat ff_sndio_muxer = {
87    .name           = "sndio",
88    .long_name      = NULL_IF_CONFIG_SMALL("sndio audio playback"),
89    .priv_data_size = sizeof(SndioData),
90    /* XXX: we make the assumption that the soundcard accepts this format */
91    /* XXX: find better solution with "preinit" method, needed also in
92       other formats */
93    .audio_codec    = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
94    .video_codec    = AV_CODEC_ID_NONE,
95    .write_header   = audio_write_header,
96    .write_packet   = audio_write_packet,
97    .write_trailer  = audio_write_trailer,
98    .flags          = AVFMT_NOFILE,
99    .priv_class     = &sndio_muxer_class,
100};
101