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1 | /* | |
2 | * PCM I/O Plug-In Interface | |
3 | * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> | |
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 <linux/time.h> | |
23 | #include <sound/core.h> | |
24 | #include <sound/pcm.h> | |
25 | #include <sound/pcm_params.h> | |
26 | #include "pcm_plugin.h" | |
27 | ||
28 | #define pcm_write(plug,buf,count) snd_pcm_oss_write3(plug,buf,count,1) | |
29 | #define pcm_writev(plug,vec,count) snd_pcm_oss_writev3(plug,vec,count) | |
30 | #define pcm_read(plug,buf,count) snd_pcm_oss_read3(plug,buf,count,1) | |
31 | #define pcm_readv(plug,vec,count) snd_pcm_oss_readv3(plug,vec,count) | |
32 | ||
33 | /* | |
34 | * Basic io plugin | |
35 | */ | |
36 | ||
37 | static snd_pcm_sframes_t io_playback_transfer(struct snd_pcm_plugin *plugin, | |
38 | const struct snd_pcm_plugin_channel *src_channels, | |
39 | struct snd_pcm_plugin_channel *dst_channels, | |
40 | snd_pcm_uframes_t frames) | |
41 | { | |
42 | if (snd_BUG_ON(!plugin)) | |
43 | return -ENXIO; | |
44 | if (snd_BUG_ON(!src_channels)) | |
45 | return -ENXIO; | |
46 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { | |
47 | return pcm_write(plugin->plug, src_channels->area.addr, frames); | |
48 | } else { | |
49 | int channel, channels = plugin->dst_format.channels; | |
50 | void **bufs = (void**)plugin->extra_data; | |
51 | if (snd_BUG_ON(!bufs)) | |
52 | return -ENXIO; | |
53 | for (channel = 0; channel < channels; channel++) { | |
54 | if (src_channels[channel].enabled) | |
55 | bufs[channel] = src_channels[channel].area.addr; | |
56 | else | |
57 | bufs[channel] = NULL; | |
58 | } | |
59 | return pcm_writev(plugin->plug, bufs, frames); | |
60 | } | |
61 | } | |
62 | ||
63 | static snd_pcm_sframes_t io_capture_transfer(struct snd_pcm_plugin *plugin, | |
64 | const struct snd_pcm_plugin_channel *src_channels, | |
65 | struct snd_pcm_plugin_channel *dst_channels, | |
66 | snd_pcm_uframes_t frames) | |
67 | { | |
68 | if (snd_BUG_ON(!plugin)) | |
69 | return -ENXIO; | |
70 | if (snd_BUG_ON(!dst_channels)) | |
71 | return -ENXIO; | |
72 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { | |
73 | return pcm_read(plugin->plug, dst_channels->area.addr, frames); | |
74 | } else { | |
75 | int channel, channels = plugin->dst_format.channels; | |
76 | void **bufs = (void**)plugin->extra_data; | |
77 | if (snd_BUG_ON(!bufs)) | |
78 | return -ENXIO; | |
79 | for (channel = 0; channel < channels; channel++) { | |
80 | if (dst_channels[channel].enabled) | |
81 | bufs[channel] = dst_channels[channel].area.addr; | |
82 | else | |
83 | bufs[channel] = NULL; | |
84 | } | |
85 | return pcm_readv(plugin->plug, bufs, frames); | |
86 | } | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static snd_pcm_sframes_t io_src_channels(struct snd_pcm_plugin *plugin, | |
91 | snd_pcm_uframes_t frames, | |
92 | struct snd_pcm_plugin_channel **channels) | |
93 | { | |
94 | int err; | |
95 | unsigned int channel; | |
96 | struct snd_pcm_plugin_channel *v; | |
97 | err = snd_pcm_plugin_client_channels(plugin, frames, &v); | |
98 | if (err < 0) | |
99 | return err; | |
100 | *channels = v; | |
101 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { | |
102 | for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v) | |
103 | v->wanted = 1; | |
104 | } | |
105 | return frames; | |
106 | } | |
107 | ||
108 | int snd_pcm_plugin_build_io(struct snd_pcm_substream *plug, | |
109 | struct snd_pcm_hw_params *params, | |
110 | struct snd_pcm_plugin **r_plugin) | |
111 | { | |
112 | int err; | |
113 | struct snd_pcm_plugin_format format; | |
114 | struct snd_pcm_plugin *plugin; | |
115 | ||
116 | if (snd_BUG_ON(!r_plugin)) | |
117 | return -ENXIO; | |
118 | *r_plugin = NULL; | |
119 | if (snd_BUG_ON(!plug || !params)) | |
120 | return -ENXIO; | |
121 | format.format = params_format(params); | |
122 | format.rate = params_rate(params); | |
123 | format.channels = params_channels(params); | |
124 | err = snd_pcm_plugin_build(plug, "I/O io", | |
125 | &format, &format, | |
126 | sizeof(void *) * format.channels, | |
127 | &plugin); | |
128 | if (err < 0) | |
129 | return err; | |
130 | plugin->access = params_access(params); | |
131 | if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) { | |
132 | plugin->transfer = io_playback_transfer; | |
133 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) | |
134 | plugin->client_channels = io_src_channels; | |
135 | } else { | |
136 | plugin->transfer = io_capture_transfer; | |
137 | } | |
138 | ||
139 | *r_plugin = plugin; | |
140 | return 0; | |
141 | } |