2 * sndio play and grab interface
3 * Copyright (c) 2010 Jacob Meuser
5 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/internal.h"
27 #include "libavformat/mux.h"
29 #include "libavdevice/avdevice.h"
30 #include "libavdevice/sndio.h"
32 static av_cold int audio_write_header(AVFormatContext *s1)
34 SndioData *s = s1->priv_data;
39 s->sample_rate = st->codecpar->sample_rate;
40 s->channels = st->codecpar->ch_layout.nb_channels;
42 ret = ff_sndio_open(s1, 1, s1->url);
47 static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
49 SndioData *s = s1->priv_data;
50 const uint8_t *buf = pkt->data;
55 len = FFMIN(s->buffer_size - s->buffer_offset, size);
56 memcpy(s->buffer + s->buffer_offset, buf, len);
59 s->buffer_offset += len;
60 if (s->buffer_offset >= s->buffer_size) {
61 ret = sio_write(s->hdl, s->buffer, s->buffer_size);
62 if (ret == 0 || sio_eof(s->hdl))
72 static int audio_write_trailer(AVFormatContext *s1)
74 SndioData *s = s1->priv_data;
76 sio_write(s->hdl, s->buffer, s->buffer_offset);
83 static const AVClass sndio_muxer_class = {
84 .class_name = "sndio outdev",
85 .item_name = av_default_item_name,
86 .version = LIBAVUTIL_VERSION_INT,
87 .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
90 const FFOutputFormat ff_sndio_muxer = {
92 .p.long_name = NULL_IF_CONFIG_SMALL("sndio audio playback"),
93 .priv_data_size = sizeof(SndioData),
94 /* XXX: we make the assumption that the soundcard accepts this format */
95 /* XXX: find better solution with "preinit" method, needed also in
97 .p.audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
98 .p.video_codec = AV_CODEC_ID_NONE,
99 .write_header = audio_write_header,
100 .write_packet = audio_write_packet,
101 .write_trailer = audio_write_trailer,
102 .p.flags = AVFMT_NOFILE,
103 .p.priv_class = &sndio_muxer_class,