blob: 2268b4cfe425460a8e9effb6289ff113b1543932
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_SOUNDCARD_H |
25 | #include <soundcard.h> |
26 | #else |
27 | #include <sys/soundcard.h> |
28 | #endif |
29 | |
30 | #if HAVE_UNISTD_H |
31 | #include <unistd.h> |
32 | #endif |
33 | #include <fcntl.h> |
34 | #include <sys/ioctl.h> |
35 | |
36 | #include "libavutil/internal.h" |
37 | |
38 | #include "libavcodec/avcodec.h" |
39 | |
40 | #include "avdevice.h" |
41 | #include "libavformat/internal.h" |
42 | |
43 | #include "oss.h" |
44 | |
45 | static int audio_write_header(AVFormatContext *s1) |
46 | { |
47 | OSSAudioData *s = s1->priv_data; |
48 | AVStream *st; |
49 | int ret; |
50 | |
51 | st = s1->streams[0]; |
52 | s->sample_rate = st->codecpar->sample_rate; |
53 | s->channels = st->codecpar->channels; |
54 | ret = ff_oss_audio_open(s1, 1, s1->filename); |
55 | if (ret < 0) { |
56 | return AVERROR(EIO); |
57 | } else { |
58 | return 0; |
59 | } |
60 | } |
61 | |
62 | static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt) |
63 | { |
64 | OSSAudioData *s = s1->priv_data; |
65 | int len, ret; |
66 | int size= pkt->size; |
67 | uint8_t *buf= pkt->data; |
68 | |
69 | while (size > 0) { |
70 | len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size); |
71 | memcpy(s->buffer + s->buffer_ptr, buf, len); |
72 | s->buffer_ptr += len; |
73 | if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) { |
74 | for(;;) { |
75 | ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE); |
76 | if (ret > 0) |
77 | break; |
78 | if (ret < 0 && (errno != EAGAIN && errno != EINTR)) |
79 | return AVERROR(EIO); |
80 | } |
81 | s->buffer_ptr = 0; |
82 | } |
83 | buf += len; |
84 | size -= len; |
85 | } |
86 | return 0; |
87 | } |
88 | |
89 | static int audio_write_trailer(AVFormatContext *s1) |
90 | { |
91 | OSSAudioData *s = s1->priv_data; |
92 | |
93 | ff_oss_audio_close(s); |
94 | return 0; |
95 | } |
96 | |
97 | static const AVClass oss_muxer_class = { |
98 | .class_name = "OSS muxer", |
99 | .item_name = av_default_item_name, |
100 | .version = LIBAVUTIL_VERSION_INT, |
101 | .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT, |
102 | }; |
103 | |
104 | AVOutputFormat ff_oss_muxer = { |
105 | .name = "oss", |
106 | .long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"), |
107 | .priv_data_size = sizeof(OSSAudioData), |
108 | /* XXX: we make the assumption that the soundcard accepts this format */ |
109 | /* XXX: find better solution with "preinit" method, needed also in |
110 | other formats */ |
111 | .audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE), |
112 | .video_codec = AV_CODEC_ID_NONE, |
113 | .write_header = audio_write_header, |
114 | .write_packet = audio_write_packet, |
115 | .write_trailer = audio_write_trailer, |
116 | .flags = AVFMT_NOFILE, |
117 | .priv_class = &oss_muxer_class, |
118 | }; |
119 |