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 "avdevice.h"
34 #include "libavformat/internal.h"
35
36 #include "oss.h"
37
audio_write_header(AVFormatContext *s1)38 static int audio_write_header(AVFormatContext *s1)
39 {
40 OSSAudioData *s = s1->priv_data;
41 AVStream *st;
42 int ret;
43
44 st = s1->streams[0];
45 s->sample_rate = st->codecpar->sample_rate;
46 s->channels = st->codecpar->ch_layout.nb_channels;
47 ret = ff_oss_audio_open(s1, 1, s1->url);
48 if (ret < 0) {
49 return AVERROR(EIO);
50 } else {
51 return 0;
52 }
53 }
54
audio_write_packet(AVFormatContext *s1, AVPacket *pkt)55 static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
56 {
57 OSSAudioData *s = s1->priv_data;
58 const uint8_t *buf = pkt->data;
59 int len, ret;
60 int size= pkt->size;
61
62 while (size > 0) {
63 len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size);
64 memcpy(s->buffer + s->buffer_ptr, buf, len);
65 s->buffer_ptr += len;
66 if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) {
67 for(;;) {
68 ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE);
69 if (ret > 0)
70 break;
71 if (ret < 0 && (errno != EAGAIN && errno != EINTR))
72 return AVERROR(EIO);
73 }
74 s->buffer_ptr = 0;
75 }
76 buf += len;
77 size -= len;
78 }
79 return 0;
80 }
81
audio_write_trailer(AVFormatContext *s1)82 static int audio_write_trailer(AVFormatContext *s1)
83 {
84 OSSAudioData *s = s1->priv_data;
85
86 ff_oss_audio_close(s);
87 return 0;
88 }
89
90 static const AVClass oss_muxer_class = {
91 .class_name = "OSS outdev",
92 .item_name = av_default_item_name,
93 .version = LIBAVUTIL_VERSION_INT,
94 .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
95 };
96
97 const AVOutputFormat ff_oss_muxer = {
98 .name = "oss",
99 .long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"),
100 .priv_data_size = sizeof(OSSAudioData),
101 /* XXX: we make the assumption that the soundcard accepts this format */
102 /* XXX: find better solution with "preinit" method, needed also in
103 other formats */
104 .audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
105 .video_codec = AV_CODEC_ID_NONE,
106 .write_header = audio_write_header,
107 .write_packet = audio_write_packet,
108 .write_trailer = audio_write_trailer,
109 .flags = AVFMT_NOFILE,
110 .priv_class = &oss_muxer_class,
111 };
112