2 * PCM I/O Plug-In Interface
3 * Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Library General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <sound/driver.h>
23 #include <linux/time.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include "pcm_plugin.h"
29 #define pcm_write(plug,buf,count) snd_pcm_oss_write3(plug,buf,count,1)
30 #define pcm_writev(plug,vec,count) snd_pcm_oss_writev3(plug,vec,count,1)
31 #define pcm_read(plug,buf,count) snd_pcm_oss_read3(plug,buf,count,1)
32 #define pcm_readv(plug,vec,count) snd_pcm_oss_readv3(plug,vec,count,1)
38 static snd_pcm_sframes_t
io_playback_transfer(snd_pcm_plugin_t
*plugin
,
39 const snd_pcm_plugin_channel_t
*src_channels
,
40 snd_pcm_plugin_channel_t
*dst_channels ATTRIBUTE_UNUSED
,
41 snd_pcm_uframes_t frames
)
43 snd_assert(plugin
!= NULL
, return -ENXIO
);
44 snd_assert(src_channels
!= NULL
, return -ENXIO
);
45 if (plugin
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
) {
46 return pcm_write(plugin
->plug
, src_channels
->area
.addr
, frames
);
48 int channel
, channels
= plugin
->dst_format
.channels
;
49 void **bufs
= (void**)plugin
->extra_data
;
50 snd_assert(bufs
!= NULL
, return -ENXIO
);
51 for (channel
= 0; channel
< channels
; channel
++) {
52 if (src_channels
[channel
].enabled
)
53 bufs
[channel
] = src_channels
[channel
].area
.addr
;
57 return pcm_writev(plugin
->plug
, bufs
, frames
);
61 static snd_pcm_sframes_t
io_capture_transfer(snd_pcm_plugin_t
*plugin
,
62 const snd_pcm_plugin_channel_t
*src_channels ATTRIBUTE_UNUSED
,
63 snd_pcm_plugin_channel_t
*dst_channels
,
64 snd_pcm_uframes_t frames
)
66 snd_assert(plugin
!= NULL
, return -ENXIO
);
67 snd_assert(dst_channels
!= NULL
, return -ENXIO
);
68 if (plugin
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
) {
69 return pcm_read(plugin
->plug
, dst_channels
->area
.addr
, frames
);
71 int channel
, channels
= plugin
->dst_format
.channels
;
72 void **bufs
= (void**)plugin
->extra_data
;
73 snd_assert(bufs
!= NULL
, return -ENXIO
);
74 for (channel
= 0; channel
< channels
; channel
++) {
75 if (dst_channels
[channel
].enabled
)
76 bufs
[channel
] = dst_channels
[channel
].area
.addr
;
80 return pcm_readv(plugin
->plug
, bufs
, frames
);
85 static snd_pcm_sframes_t
io_src_channels(snd_pcm_plugin_t
*plugin
,
86 snd_pcm_uframes_t frames
,
87 snd_pcm_plugin_channel_t
**channels
)
91 snd_pcm_plugin_channel_t
*v
;
92 err
= snd_pcm_plugin_client_channels(plugin
, frames
, &v
);
96 if (plugin
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
) {
97 for (channel
= 0; channel
< plugin
->src_format
.channels
; ++channel
, ++v
)
103 int snd_pcm_plugin_build_io(snd_pcm_plug_t
*plug
,
104 snd_pcm_hw_params_t
*params
,
105 snd_pcm_plugin_t
**r_plugin
)
108 snd_pcm_plugin_format_t format
;
109 snd_pcm_plugin_t
*plugin
;
111 snd_assert(r_plugin
!= NULL
, return -ENXIO
);
113 snd_assert(plug
!= NULL
&& params
!= NULL
, return -ENXIO
);
114 format
.format
= params_format(params
);
115 format
.rate
= params_rate(params
);
116 format
.channels
= params_channels(params
);
117 err
= snd_pcm_plugin_build(plug
, "I/O io",
119 sizeof(void *) * format
.channels
,
123 plugin
->access
= params_access(params
);
124 if (snd_pcm_plug_stream(plug
) == SNDRV_PCM_STREAM_PLAYBACK
) {
125 plugin
->transfer
= io_playback_transfer
;
126 if (plugin
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
127 plugin
->client_channels
= io_src_channels
;
129 plugin
->transfer
= io_capture_transfer
;