oss_audio: Split muxer and demuxer
[libav.git] / libavdevice / oss_audio_enc.c
1 /*
2 * Linux audio grab interface
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "config.h"
23
24 #if HAVE_SOUNDCARD_H
25 #include <soundcard.h>
26 #else
27 #include <sys/soundcard.h>
28 #endif
29
30 #include <unistd.h>
31 #include <fcntl.h>
32 #include <sys/ioctl.h>
33
34 #include "libavutil/internal.h"
35
36 #include "libavcodec/avcodec.h"
37
38 #include "libavformat/avformat.h"
39 #include "libavformat/internal.h"
40
41 #include "oss_audio.h"
42
43 static int audio_write_header(AVFormatContext *s1)
44 {
45 OSSAudioData *s = s1->priv_data;
46 AVStream *st;
47 int ret;
48
49 st = s1->streams[0];
50 s->sample_rate = st->codec->sample_rate;
51 s->channels = st->codec->channels;
52 ret = ff_oss_audio_open(s1, 1, s1->filename);
53 if (ret < 0) {
54 return AVERROR(EIO);
55 } else {
56 return 0;
57 }
58 }
59
60 static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
61 {
62 OSSAudioData *s = s1->priv_data;
63 int len, ret;
64 int size= pkt->size;
65 uint8_t *buf= pkt->data;
66
67 while (size > 0) {
68 len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size);
69 memcpy(s->buffer + s->buffer_ptr, buf, len);
70 s->buffer_ptr += len;
71 if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) {
72 for(;;) {
73 ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE);
74 if (ret > 0)
75 break;
76 if (ret < 0 && (errno != EAGAIN && errno != EINTR))
77 return AVERROR(EIO);
78 }
79 s->buffer_ptr = 0;
80 }
81 buf += len;
82 size -= len;
83 }
84 return 0;
85 }
86
87 static int audio_write_trailer(AVFormatContext *s1)
88 {
89 OSSAudioData *s = s1->priv_data;
90
91 ff_oss_audio_close(s);
92 return 0;
93 }
94
95 AVOutputFormat ff_oss_muxer = {
96 .name = "oss",
97 .long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"),
98 .priv_data_size = sizeof(OSSAudioData),
99 /* XXX: we make the assumption that the soundcard accepts this format */
100 /* XXX: find better solution with "preinit" method, needed also in
101 other formats */
102 .audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
103 .video_codec = AV_CODEC_ID_NONE,
104 .write_header = audio_write_header,
105 .write_packet = audio_write_packet,
106 .write_trailer = audio_write_trailer,
107 .flags = AVFMT_NOFILE,
108 };