FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavdevice/oss_dec.c
Date: 2024-04-19 17:50:32
Exec Total Coverage
Lines: 0 41 0.0%
Functions: 0 3 0.0%
Branches: 0 18 0.0%

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