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
124
125
126
127
128
129
130
131
132
133
134
|
/*
* PCM I/O Plug-In Interface
* Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sound/driver.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "pcm_plugin.h"
#define pcm_write(plug,buf,count) snd_pcm_oss_write3(plug,buf,count,1)
#define pcm_writev(plug,vec,count) snd_pcm_oss_writev3(plug,vec,count,1)
#define pcm_read(plug,buf,count) snd_pcm_oss_read3(plug,buf,count,1)
#define pcm_readv(plug,vec,count) snd_pcm_oss_readv3(plug,vec,count,1)
/*
* Basic io plugin
*/
static snd_pcm_sframes_t io_playback_transfer(snd_pcm_plugin_t *plugin,
const snd_pcm_plugin_channel_t *src_channels,
snd_pcm_plugin_channel_t *dst_channels,
snd_pcm_uframes_t frames)
{
snd_assert(plugin != NULL, return -ENXIO);
snd_assert(src_channels != NULL, return -ENXIO);
if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
return pcm_write(plugin->plug, src_channels->area.addr, frames);
} else {
int channel, channels = plugin->dst_format.channels;
void **bufs = (void**)plugin->extra_data;
snd_assert(bufs != NULL, return -ENXIO);
for (channel = 0; channel < channels; channel++) {
if (src_channels[channel].enabled)
bufs[channel] = src_channels[channel].area.addr;
else
bufs[channel] = NULL;
}
return pcm_writev(plugin->plug, bufs, frames);
}
}
static snd_pcm_sframes_t io_capture_transfer(snd_pcm_plugin_t *plugin,
const snd_pcm_plugin_channel_t *src_channels,
snd_pcm_plugin_channel_t *dst_channels,
snd_pcm_uframes_t frames)
{
snd_assert(plugin != NULL, return -ENXIO);
snd_assert(dst_channels != NULL, return -ENXIO);
if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
return pcm_read(plugin->plug, dst_channels->area.addr, frames);
} else {
int channel, channels = plugin->dst_format.channels;
void **bufs = (void**)plugin->extra_data;
snd_assert(bufs != NULL, return -ENXIO);
for (channel = 0; channel < channels; channel++) {
if (dst_channels[channel].enabled)
bufs[channel] = dst_channels[channel].area.addr;
else
bufs[channel] = NULL;
}
return pcm_readv(plugin->plug, bufs, frames);
}
return 0;
}
static snd_pcm_sframes_t io_src_channels(snd_pcm_plugin_t *plugin,
snd_pcm_uframes_t frames,
snd_pcm_plugin_channel_t **channels)
{
int err;
unsigned int channel;
snd_pcm_plugin_channel_t *v;
err = snd_pcm_plugin_client_channels(plugin, frames, &v);
if (err < 0)
return err;
*channels = v;
if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v)
v->wanted = 1;
}
return frames;
}
int snd_pcm_plugin_build_io(snd_pcm_plug_t *plug,
snd_pcm_hw_params_t *params,
snd_pcm_plugin_t **r_plugin)
{
int err;
snd_pcm_plugin_format_t format;
snd_pcm_plugin_t *plugin;
snd_assert(r_plugin != NULL, return -ENXIO);
*r_plugin = NULL;
snd_assert(plug != NULL && params != NULL, return -ENXIO);
format.format = params_format(params);
format.rate = params_rate(params);
format.channels = params_channels(params);
err = snd_pcm_plugin_build(plug, "I/O io",
&format, &format,
sizeof(void *) * format.channels,
&plugin);
if (err < 0)
return err;
plugin->access = params_access(params);
if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
plugin->transfer = io_playback_transfer;
if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
plugin->client_channels = io_src_channels;
} else {
plugin->transfer = io_capture_transfer;
}
*r_plugin = plugin;
return 0;
}
|
