1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
#include "config.h"
#include <linux/soundcard.h>
#include <fcntl.h>
#include <errno.h>
#include "audio_in.h"
#include "mp_msg.h"
int ai_oss_set_samplerate(audio_in_t *ai)
{
int tmp = ai->req_samplerate;
if (ioctl(ai->oss.audio_fd, SNDCTL_DSP_SPEED, &tmp) == -1) return -1;
ai->samplerate = ai->req_samplerate;
return 0;
}
int ai_oss_set_channels(audio_in_t *ai)
{
int err;
int ioctl_param;
if (ai->req_channels > 2)
{
ioctl_param = ai->req_channels;
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp channels: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_CHANNELS, &ioctl_param));
if (err < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "Unable to set channel count: %d\n",
ai->req_channels);
return -1;
}
}
else
{
ioctl_param = (ai->req_channels == 2);
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp stereo: %d (req: %d)\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_STEREO, &ioctl_param),
ioctl_param);
if (err < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "Unable to set stereo: %d\n",
ai->req_channels == 2);
return -1;
}
}
ai->channels = ai->req_channels;
return 0;
}
int ai_oss_init(audio_in_t *ai)
{
int err;
int ioctl_param;
ai->oss.audio_fd = open(ai->oss.device, O_RDONLY);
if (ai->oss.audio_fd < 0)
{
mp_msg(MSGT_TV, MSGL_ERR, "unable to open '%s': %s\n",
ai->oss.device, strerror(errno));
return -1;
}
ioctl_param = 0 ;
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp getfmt: %d\n",
ioctl(ai->oss.audio_fd, SNDCTL_DSP_GETFMTS, &ioctl_param));
mp_msg(MSGT_TV, MSGL_V, "Supported formats: %x\n", ioctl_param);
if (!(ioctl_param & AFMT_S16_LE))
mp_msg(MSGT_TV, MSGL_ERR, "notsupported format\n");
ioctl_param = AFMT_S16_LE;
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp setfmt: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_SETFMT, &ioctl_param));
if (err < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "Unable to set audio format.");
return -1;
}
if (ai_oss_set_channels(ai) < 0) return -1;
ioctl_param = ai->req_samplerate;
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp speed: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_SPEED, &ioctl_param));
if (err < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "Unable to set samplerate: %d\n",
ai->req_samplerate);
return -1;
}
ai->samplerate = ai->req_samplerate;
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp trigger: %d\n",
ioctl(ai->oss.audio_fd, SNDCTL_DSP_GETTRIGGER, &ioctl_param));
mp_msg(MSGT_TV, MSGL_V, "trigger: %x\n", ioctl_param);
ioctl_param = PCM_ENABLE_INPUT;
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp trigger: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_SETTRIGGER, &ioctl_param));
if (err < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "Unable to set trigger: %d\n",
PCM_ENABLE_INPUT);
return -1;
}
ai->blocksize = 0;
mp_msg(MSGT_TV, MSGL_V, "ioctl dsp getblocksize: %d\n",
err = ioctl(ai->oss.audio_fd, SNDCTL_DSP_GETBLKSIZE, &ai->blocksize));
if (err < 0) {
mp_msg(MSGT_TV, MSGL_ERR, "Unable to get block size!\n");
}
mp_msg(MSGT_TV, MSGL_V, "blocksize: %d\n", ai->blocksize);
// correct the blocksize to a reasonable value
if (ai->blocksize <= 0) {
ai->blocksize = 4096*ai->channels*2;
mp_msg(MSGT_TV, MSGL_ERR, "audio block size is zero, setting to %d!\n", ai->blocksize);
} else if (ai->blocksize < 4096*ai->channels*2) {
ai->blocksize *= 4096*ai->channels*2/ai->blocksize;
mp_msg(MSGT_TV, MSGL_ERR, "audio block size too low, setting to %d!\n", ai->blocksize);
}
ai->samplesize = 16;
ai->bytes_per_sample = 2;
return 0;
}
|
