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
audio_write_header(AVFormatContext * s1)28 static 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
audio_write_packet(AVFormatContext * s1,AVPacket * pkt)43 static 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
audio_write_trailer(AVFormatContext * s1)68 static 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
79 static 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
86 AVOutputFormat 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