FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavdevice/oss.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 0 53 0.0%
Functions: 0 2 0.0%
Branches: 0 27 0.0%

Line Branch Exec Source
1 /*
2 * Linux audio play and 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 #include <string.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/file_open.h"
34 #include "libavutil/log.h"
35
36 #include "avdevice.h"
37
38 #include "oss.h"
39
40 int ff_oss_audio_open(AVFormatContext *s1, int is_output,
41 const char *audio_device)
42 {
43 OSSAudioData *s = s1->priv_data;
44 int audio_fd;
45 int tmp, err;
46 char *flip = getenv("AUDIO_FLIP_LEFT");
47
48 if (is_output)
49 audio_fd = avpriv_open(audio_device, O_WRONLY);
50 else
51 audio_fd = avpriv_open(audio_device, O_RDONLY);
52 if (audio_fd < 0) {
53 av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, av_err2str(AVERROR(errno)));
54 return AVERROR(EIO);
55 }
56
57 if (flip && *flip == '1') {
58 s->flip_left = 1;
59 }
60
61 /* non blocking mode */
62 if (!is_output) {
63 if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) {
64 av_log(s1, AV_LOG_WARNING, "%s: Could not enable non block mode (%s)\n", audio_device, av_err2str(AVERROR(errno)));
65 }
66 }
67
68 s->frame_size = OSS_AUDIO_BLOCK_SIZE;
69
70 #define CHECK_IOCTL_ERROR(event) \
71 if (err < 0) { \
72 av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\
73 goto fail; \
74 }
75
76 /* select format : favour native format
77 * We don't CHECK_IOCTL_ERROR here because even if failed OSS still may be
78 * usable. If OSS is not usable the SNDCTL_DSP_SETFMTS later is going to
79 * fail anyway. */
80 err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
81 if (err < 0) {
82 av_log(s1, AV_LOG_WARNING, "SNDCTL_DSP_GETFMTS: %s\n", av_err2str(AVERROR(errno)));
83 }
84
85 #if HAVE_BIGENDIAN
86 if (tmp & AFMT_S16_BE) {
87 tmp = AFMT_S16_BE;
88 } else if (tmp & AFMT_S16_LE) {
89 tmp = AFMT_S16_LE;
90 } else {
91 tmp = 0;
92 }
93 #else
94 if (tmp & AFMT_S16_LE) {
95 tmp = AFMT_S16_LE;
96 } else if (tmp & AFMT_S16_BE) {
97 tmp = AFMT_S16_BE;
98 } else {
99 tmp = 0;
100 }
101 #endif
102
103 switch(tmp) {
104 case AFMT_S16_LE:
105 s->codec_id = AV_CODEC_ID_PCM_S16LE;
106 s->sample_size = 2;
107 break;
108 case AFMT_S16_BE:
109 s->codec_id = AV_CODEC_ID_PCM_S16BE;
110 s->sample_size = 2;
111 break;
112 default:
113 av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
114 close(audio_fd);
115 return AVERROR(EIO);
116 }
117 err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
118 CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMT)
119
120 tmp = (s->channels == 2);
121 err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
122 CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO)
123
124 tmp = s->sample_rate;
125 err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
126 CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED)
127 s->sample_rate = tmp; /* store real sample rate */
128 s->fd = audio_fd;
129
130 return 0;
131 fail:
132 close(audio_fd);
133 return AVERROR(EIO);
134 #undef CHECK_IOCTL_ERROR
135 }
136
137 int ff_oss_audio_close(OSSAudioData *s)
138 {
139 close(s->fd);
140 return 0;
141 }
142