1 /*
2 * Linux audio grab interface
3 * Copyright (c) 2000, 2001 Fabrice Bellard
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 "config.h"
23
24 #if HAVE_UNISTD_H
25 #include <unistd.h>
26 #endif
27 #include <fcntl.h>
28 #include <sys/ioctl.h>
29 #include <sys/soundcard.h>
30
31 #include "libavutil/internal.h"
32
33 #include "libavcodec/avcodec.h"
34
35 #include "avdevice.h"
36 #include "libavformat/internal.h"
37
38 #include "oss.h"
39
audio_write_header(AVFormatContext * s1)40 static int audio_write_header(AVFormatContext *s1)
41 {
42 OSSAudioData *s = s1->priv_data;
43 AVStream *st;
44 int ret;
45
46 st = s1->streams[0];
47 s->sample_rate = st->codecpar->sample_rate;
48 s->channels = st->codecpar->channels;
49 ret = ff_oss_audio_open(s1, 1, s1->url);
50 if (ret < 0) {
51 return AVERROR(EIO);
52 } else {
53 return 0;
54 }
55 }
56
audio_write_packet(AVFormatContext * s1,AVPacket * pkt)57 static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
58 {
59 OSSAudioData *s = s1->priv_data;
60 int len, ret;
61 int size= pkt->size;
62 uint8_t *buf= pkt->data;
63
64 while (size > 0) {
65 len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size);
66 memcpy(s->buffer + s->buffer_ptr, buf, len);
67 s->buffer_ptr += len;
68 if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) {
69 for(;;) {
70 ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE);
71 if (ret > 0)
72 break;
73 if (ret < 0 && (errno != EAGAIN && errno != EINTR))
74 return AVERROR(EIO);
75 }
76 s->buffer_ptr = 0;
77 }
78 buf += len;
79 size -= len;
80 }
81 return 0;
82 }
83
audio_write_trailer(AVFormatContext * s1)84 static int audio_write_trailer(AVFormatContext *s1)
85 {
86 OSSAudioData *s = s1->priv_data;
87
88 ff_oss_audio_close(s);
89 return 0;
90 }
91
92 static const AVClass oss_muxer_class = {
93 .class_name = "OSS outdev",
94 .item_name = av_default_item_name,
95 .version = LIBAVUTIL_VERSION_INT,
96 .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
97 };
98
99 AVOutputFormat ff_oss_muxer = {
100 .name = "oss",
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
105 other formats */
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,
113 };
114