Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * PCM I/O Plug-In Interface | |
c1017a4c | 3 | * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
4 | * |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | * | |
20 | */ | |
21 | ||
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" | |
28 | ||
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) | |
33 | ||
34 | /* | |
35 | * Basic io plugin | |
36 | */ | |
37 | ||
6ac77bc1 TI |
38 | static snd_pcm_sframes_t io_playback_transfer(struct snd_pcm_plugin *plugin, |
39 | const struct snd_pcm_plugin_channel *src_channels, | |
40 | struct snd_pcm_plugin_channel *dst_channels, | |
1da177e4 LT |
41 | snd_pcm_uframes_t frames) |
42 | { | |
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); | |
47 | } else { | |
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; | |
54 | else | |
55 | bufs[channel] = NULL; | |
56 | } | |
57 | return pcm_writev(plugin->plug, bufs, frames); | |
58 | } | |
59 | } | |
60 | ||
6ac77bc1 TI |
61 | static snd_pcm_sframes_t io_capture_transfer(struct snd_pcm_plugin *plugin, |
62 | const struct snd_pcm_plugin_channel *src_channels, | |
63 | struct snd_pcm_plugin_channel *dst_channels, | |
1da177e4 LT |
64 | snd_pcm_uframes_t frames) |
65 | { | |
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); | |
70 | } else { | |
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; | |
77 | else | |
78 | bufs[channel] = NULL; | |
79 | } | |
80 | return pcm_readv(plugin->plug, bufs, frames); | |
81 | } | |
82 | return 0; | |
83 | } | |
84 | ||
6ac77bc1 | 85 | static snd_pcm_sframes_t io_src_channels(struct snd_pcm_plugin *plugin, |
1da177e4 | 86 | snd_pcm_uframes_t frames, |
6ac77bc1 | 87 | struct snd_pcm_plugin_channel **channels) |
1da177e4 LT |
88 | { |
89 | int err; | |
90 | unsigned int channel; | |
6ac77bc1 | 91 | struct snd_pcm_plugin_channel *v; |
1da177e4 LT |
92 | err = snd_pcm_plugin_client_channels(plugin, frames, &v); |
93 | if (err < 0) | |
94 | return err; | |
95 | *channels = v; | |
96 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { | |
97 | for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v) | |
98 | v->wanted = 1; | |
99 | } | |
100 | return frames; | |
101 | } | |
102 | ||
6ac77bc1 TI |
103 | int snd_pcm_plugin_build_io(struct snd_pcm_substream *plug, |
104 | struct snd_pcm_hw_params *params, | |
105 | struct snd_pcm_plugin **r_plugin) | |
1da177e4 LT |
106 | { |
107 | int err; | |
6ac77bc1 TI |
108 | struct snd_pcm_plugin_format format; |
109 | struct snd_pcm_plugin *plugin; | |
1da177e4 LT |
110 | |
111 | snd_assert(r_plugin != NULL, return -ENXIO); | |
112 | *r_plugin = NULL; | |
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", | |
118 | &format, &format, | |
119 | sizeof(void *) * format.channels, | |
120 | &plugin); | |
121 | if (err < 0) | |
122 | return err; | |
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; | |
128 | } else { | |
129 | plugin->transfer = io_capture_transfer; | |
130 | } | |
131 | ||
132 | *r_plugin = plugin; | |
133 | return 0; | |
134 | } |