Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * PCM I/O Plug-In Interface |
Jaroslav Kysela | c1017a4 | 2007-10-15 09:50:19 +0200 | [diff] [blame] | 3 | * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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,1) |
| 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,1) |
| 32 | |
| 33 | /* |
| 34 | * Basic io plugin |
| 35 | */ |
| 36 | |
Takashi Iwai | 6ac77bc | 2005-11-17 14:01:49 +0100 | [diff] [blame] | 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, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | snd_pcm_uframes_t frames) |
| 41 | { |
| 42 | snd_assert(plugin != NULL, return -ENXIO); |
| 43 | snd_assert(src_channels != NULL, return -ENXIO); |
| 44 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { |
| 45 | return pcm_write(plugin->plug, src_channels->area.addr, frames); |
| 46 | } else { |
| 47 | int channel, channels = plugin->dst_format.channels; |
| 48 | void **bufs = (void**)plugin->extra_data; |
| 49 | snd_assert(bufs != NULL, return -ENXIO); |
| 50 | for (channel = 0; channel < channels; channel++) { |
| 51 | if (src_channels[channel].enabled) |
| 52 | bufs[channel] = src_channels[channel].area.addr; |
| 53 | else |
| 54 | bufs[channel] = NULL; |
| 55 | } |
| 56 | return pcm_writev(plugin->plug, bufs, frames); |
| 57 | } |
| 58 | } |
| 59 | |
Takashi Iwai | 6ac77bc | 2005-11-17 14:01:49 +0100 | [diff] [blame] | 60 | static snd_pcm_sframes_t io_capture_transfer(struct snd_pcm_plugin *plugin, |
| 61 | const struct snd_pcm_plugin_channel *src_channels, |
| 62 | struct snd_pcm_plugin_channel *dst_channels, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | snd_pcm_uframes_t frames) |
| 64 | { |
| 65 | snd_assert(plugin != NULL, return -ENXIO); |
| 66 | snd_assert(dst_channels != NULL, return -ENXIO); |
| 67 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { |
| 68 | return pcm_read(plugin->plug, dst_channels->area.addr, frames); |
| 69 | } else { |
| 70 | int channel, channels = plugin->dst_format.channels; |
| 71 | void **bufs = (void**)plugin->extra_data; |
| 72 | snd_assert(bufs != NULL, return -ENXIO); |
| 73 | for (channel = 0; channel < channels; channel++) { |
| 74 | if (dst_channels[channel].enabled) |
| 75 | bufs[channel] = dst_channels[channel].area.addr; |
| 76 | else |
| 77 | bufs[channel] = NULL; |
| 78 | } |
| 79 | return pcm_readv(plugin->plug, bufs, frames); |
| 80 | } |
| 81 | return 0; |
| 82 | } |
| 83 | |
Takashi Iwai | 6ac77bc | 2005-11-17 14:01:49 +0100 | [diff] [blame] | 84 | static snd_pcm_sframes_t io_src_channels(struct snd_pcm_plugin *plugin, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | snd_pcm_uframes_t frames, |
Takashi Iwai | 6ac77bc | 2005-11-17 14:01:49 +0100 | [diff] [blame] | 86 | struct snd_pcm_plugin_channel **channels) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
| 88 | int err; |
| 89 | unsigned int channel; |
Takashi Iwai | 6ac77bc | 2005-11-17 14:01:49 +0100 | [diff] [blame] | 90 | struct snd_pcm_plugin_channel *v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | err = snd_pcm_plugin_client_channels(plugin, frames, &v); |
| 92 | if (err < 0) |
| 93 | return err; |
| 94 | *channels = v; |
| 95 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) { |
| 96 | for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v) |
| 97 | v->wanted = 1; |
| 98 | } |
| 99 | return frames; |
| 100 | } |
| 101 | |
Takashi Iwai | 6ac77bc | 2005-11-17 14:01:49 +0100 | [diff] [blame] | 102 | int snd_pcm_plugin_build_io(struct snd_pcm_substream *plug, |
| 103 | struct snd_pcm_hw_params *params, |
| 104 | struct snd_pcm_plugin **r_plugin) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
| 106 | int err; |
Takashi Iwai | 6ac77bc | 2005-11-17 14:01:49 +0100 | [diff] [blame] | 107 | struct snd_pcm_plugin_format format; |
| 108 | struct snd_pcm_plugin *plugin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | snd_assert(r_plugin != NULL, return -ENXIO); |
| 111 | *r_plugin = NULL; |
| 112 | snd_assert(plug != NULL && params != NULL, return -ENXIO); |
| 113 | format.format = params_format(params); |
| 114 | format.rate = params_rate(params); |
| 115 | format.channels = params_channels(params); |
| 116 | err = snd_pcm_plugin_build(plug, "I/O io", |
| 117 | &format, &format, |
| 118 | sizeof(void *) * format.channels, |
| 119 | &plugin); |
| 120 | if (err < 0) |
| 121 | return err; |
| 122 | plugin->access = params_access(params); |
| 123 | if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) { |
| 124 | plugin->transfer = io_playback_transfer; |
| 125 | if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
| 126 | plugin->client_channels = io_src_channels; |
| 127 | } else { |
| 128 | plugin->transfer = io_capture_transfer; |
| 129 | } |
| 130 | |
| 131 | *r_plugin = plugin; |
| 132 | return 0; |
| 133 | } |