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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | /* * PCM I/O Plug-In Interface * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.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 <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) #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) /* * Basic io plugin */ static snd_pcm_sframes_t io_playback_transfer(struct snd_pcm_plugin *plugin, const struct snd_pcm_plugin_channel *src_channels, struct snd_pcm_plugin_channel *dst_channels, snd_pcm_uframes_t frames) { if (snd_BUG_ON(!plugin)) return -ENXIO; if (snd_BUG_ON(!src_channels)) 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; if (snd_BUG_ON(!bufs)) 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(struct snd_pcm_plugin *plugin, const struct snd_pcm_plugin_channel *src_channels, struct snd_pcm_plugin_channel *dst_channels, snd_pcm_uframes_t frames) { if (snd_BUG_ON(!plugin)) return -ENXIO; if (snd_BUG_ON(!dst_channels)) 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; if (snd_BUG_ON(!bufs)) 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(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames, struct snd_pcm_plugin_channel **channels) { int err; unsigned int channel; struct snd_pcm_plugin_channel *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(struct snd_pcm_substream *plug, struct snd_pcm_hw_params *params, struct snd_pcm_plugin **r_plugin) { int err; struct snd_pcm_plugin_format format; struct snd_pcm_plugin *plugin; if (snd_BUG_ON(!r_plugin)) return -ENXIO; *r_plugin = NULL; if (snd_BUG_ON(!plug || !params)) 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; } |