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1 | /* |
2 | * Linux audio play 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 | #include <stdint.h> | |
25 | ||
26 | #if HAVE_SOUNDCARD_H | |
27 | #include <soundcard.h> | |
28 | #else | |
29 | #include <sys/soundcard.h> | |
30 | #endif | |
31 | ||
32 | #if HAVE_UNISTD_H | |
33 | #include <unistd.h> | |
34 | #endif | |
35 | #include <fcntl.h> | |
36 | #include <sys/ioctl.h> | |
37 | ||
38 | #include "libavutil/internal.h" | |
39 | #include "libavutil/opt.h" | |
40 | #include "libavutil/time.h" | |
41 | ||
42 | #include "libavcodec/avcodec.h" | |
43 | ||
44 | #include "avdevice.h" | |
45 | #include "libavformat/internal.h" | |
46 | ||
47 | #include "oss_audio.h" | |
48 | ||
49 | static int audio_read_header(AVFormatContext *s1) | |
50 | { | |
51 | OSSAudioData *s = s1->priv_data; | |
52 | AVStream *st; | |
53 | int ret; | |
54 | ||
55 | st = avformat_new_stream(s1, NULL); | |
56 | if (!st) { | |
57 | return AVERROR(ENOMEM); | |
58 | } | |
59 | ||
60 | ret = ff_oss_audio_open(s1, 0, s1->filename); | |
61 | if (ret < 0) { | |
62 | return AVERROR(EIO); | |
63 | } | |
64 | ||
65 | /* take real parameters */ | |
66 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
67 | st->codec->codec_id = s->codec_id; | |
68 | st->codec->sample_rate = s->sample_rate; | |
69 | st->codec->channels = s->channels; | |
70 | ||
71 | avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt) | |
76 | { | |
77 | OSSAudioData *s = s1->priv_data; | |
78 | int ret, bdelay; | |
79 | int64_t cur_time; | |
80 | struct audio_buf_info abufi; | |
81 | ||
82 | if ((ret=av_new_packet(pkt, s->frame_size)) < 0) | |
83 | return ret; | |
84 | ||
85 | ret = read(s->fd, pkt->data, pkt->size); | |
86 | if (ret <= 0){ | |
87 | av_free_packet(pkt); | |
88 | pkt->size = 0; | |
89 | if (ret<0) return AVERROR(errno); | |
90 | else return AVERROR_EOF; | |
91 | } | |
92 | pkt->size = ret; | |
93 | ||
94 | /* compute pts of the start of the packet */ | |
95 | cur_time = av_gettime(); | |
96 | bdelay = ret; | |
97 | if (ioctl(s->fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) { | |
98 | bdelay += abufi.bytes; | |
99 | } | |
100 | /* subtract time represented by the number of bytes in the audio fifo */ | |
101 | cur_time -= (bdelay * 1000000LL) / (s->sample_rate * s->channels); | |
102 | ||
103 | /* convert to wanted units */ | |
104 | pkt->pts = cur_time; | |
105 | ||
106 | if (s->flip_left && s->channels == 2) { | |
107 | int i; | |
108 | short *p = (short *) pkt->data; | |
109 | ||
110 | for (i = 0; i < ret; i += 4) { | |
111 | *p = ~*p; | |
112 | p += 2; | |
113 | } | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static int audio_read_close(AVFormatContext *s1) | |
119 | { | |
120 | OSSAudioData *s = s1->priv_data; | |
121 | ||
122 | ff_oss_audio_close(s); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static const AVOption options[] = { | |
127 | { "sample_rate", "", offsetof(OSSAudioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, | |
128 | { "channels", "", offsetof(OSSAudioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, | |
129 | { NULL }, | |
130 | }; | |
131 | ||
132 | static const AVClass oss_demuxer_class = { | |
133 | .class_name = "OSS demuxer", | |
134 | .item_name = av_default_item_name, | |
135 | .option = options, | |
136 | .version = LIBAVUTIL_VERSION_INT, | |
137 | .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT, | |
138 | }; | |
139 | ||
140 | AVInputFormat ff_oss_demuxer = { | |
141 | .name = "oss", | |
142 | .long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) capture"), | |
143 | .priv_data_size = sizeof(OSSAudioData), | |
144 | .read_header = audio_read_header, | |
145 | .read_packet = audio_read_packet, | |
146 | .read_close = audio_read_close, | |
147 | .flags = AVFMT_NOFILE, | |
148 | .priv_class = &oss_demuxer_class, | |
149 | }; |