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
audio_write_header(AVFormatContext * s1)31 static 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->channels;
40
41 ret = ff_sndio_open(s1, 1, s1->url);
42
43 return ret;
44 }
45
audio_write_packet(AVFormatContext * s1,AVPacket * pkt)46 static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
47 {
48 SndioData *s = s1->priv_data;
49 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
audio_write_trailer(AVFormatContext * s1)71 static 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
82 static 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
89 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