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 "libavutil/internal.h"
26
27
28#include "libavdevice/avdevice.h"
29#include "libavdevice/sndio.h"
30
31static av_cold int audio_write_header(AVFormatContext *s1)
32{
33    SndioData *s = s1->priv_data;
34    AVStream *st;
35    int ret;
36
37    st             = s1->streams[0];
38    s->sample_rate = st->codecpar->sample_rate;
39    s->channels    = st->codecpar->ch_layout.nb_channels;
40
41    ret = ff_sndio_open(s1, 1, s1->url);
42
43    return ret;
44}
45
46static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
47{
48    SndioData *s = s1->priv_data;
49    const uint8_t *buf = pkt->data;
50    int size = pkt->size;
51    int len, ret;
52
53    while (size > 0) {
54        len = FFMIN(s->buffer_size - s->buffer_offset, size);
55        memcpy(s->buffer + s->buffer_offset, buf, len);
56        buf  += len;
57        size -= len;
58        s->buffer_offset += len;
59        if (s->buffer_offset >= s->buffer_size) {
60            ret = sio_write(s->hdl, s->buffer, s->buffer_size);
61            if (ret == 0 || sio_eof(s->hdl))
62                return AVERROR(EIO);
63            s->softpos      += ret;
64            s->buffer_offset = 0;
65        }
66    }
67
68    return 0;
69}
70
71static int audio_write_trailer(AVFormatContext *s1)
72{
73    SndioData *s = s1->priv_data;
74
75    sio_write(s->hdl, s->buffer, s->buffer_offset);
76
77    ff_sndio_close(s);
78
79    return 0;
80}
81
82static const AVClass sndio_muxer_class = {
83    .class_name     = "sndio outdev",
84    .item_name      = av_default_item_name,
85    .version        = LIBAVUTIL_VERSION_INT,
86    .category       = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
87};
88
89const AVOutputFormat ff_sndio_muxer = {
90    .name           = "sndio",
91    .long_name      = NULL_IF_CONFIG_SMALL("sndio audio playback"),
92    .priv_data_size = sizeof(SndioData),
93    /* XXX: we make the assumption that the soundcard accepts this format */
94    /* XXX: find better solution with "preinit" method, needed also in
95       other formats */
96    .audio_codec    = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
97    .video_codec    = AV_CODEC_ID_NONE,
98    .write_header   = audio_write_header,
99    .write_packet   = audio_write_packet,
100    .write_trailer  = audio_write_trailer,
101    .flags          = AVFMT_NOFILE,
102    .priv_class     = &sndio_muxer_class,
103};
104