2 * Linux audio grab interface
3 * Copyright (c) 2000, 2001 Fabrice Bellard
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
28 #include <sys/ioctl.h>
29 #include <sys/soundcard.h>
31 #include "libavutil/internal.h"
33 #include "libavcodec/avcodec.h"
36 #include "libavformat/internal.h"
40 static int audio_write_header(AVFormatContext *s1)
42 OSSAudioData *s = s1->priv_data;
47 s->sample_rate = st->codecpar->sample_rate;
48 s->channels = st->codecpar->channels;
49 ret = ff_oss_audio_open(s1, 1, s1->url);
57 static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
59 OSSAudioData *s = s1->priv_data;
62 uint8_t *buf= pkt->data;
65 len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size);
66 memcpy(s->buffer + s->buffer_ptr, buf, len);
68 if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) {
70 ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE);
73 if (ret < 0 && (errno != EAGAIN && errno != EINTR))
84 static int audio_write_trailer(AVFormatContext *s1)
86 OSSAudioData *s = s1->priv_data;
88 ff_oss_audio_close(s);
92 static const AVClass oss_muxer_class = {
93 .class_name = "OSS muxer",
94 .item_name = av_default_item_name,
95 .version = LIBAVUTIL_VERSION_INT,
96 .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
99 AVOutputFormat ff_oss_muxer = {
101 .long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"),
102 .priv_data_size = sizeof(OSSAudioData),
103 /* XXX: we make the assumption that the soundcard accepts this format */
104 /* XXX: find better solution with "preinit" method, needed also in
106 .audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
107 .video_codec = AV_CODEC_ID_NONE,
108 .write_header = audio_write_header,
109 .write_packet = audio_write_packet,
110 .write_trailer = audio_write_trailer,
111 .flags = AVFMT_NOFILE,
112 .priv_class = &oss_muxer_class,