projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Linear conversion Plug-In | |
| 3 | * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org> | |
| 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> | |
| 21a3479a JK |
23 | |
| 24 | #ifdef SND_PCM_OSS_PLUGINS | |
| 25 | ||
| 1da177e4 LT |
26 | #include <linux/time.h> |
| 27 | #include <sound/core.h> | |
| 28 | #include <sound/pcm.h> | |
| 29 | #include "pcm_plugin.h" | |
| 30 | ||
| 6ac77bc1 TI |
31 | static snd_pcm_sframes_t copy_transfer(struct snd_pcm_plugin *plugin, |
| 32 | const struct snd_pcm_plugin_channel *src_channels, | |
| 33 | struct snd_pcm_plugin_channel *dst_channels, | |
| 1da177e4 LT |
34 | snd_pcm_uframes_t frames) |
| 35 | { | |
| 36 | unsigned int channel; | |
| 37 | unsigned int nchannels; | |
| 38 | ||
| 39 | snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO); | |
| 40 | if (frames == 0) | |
| 41 | return 0; | |
| 42 | nchannels = plugin->src_format.channels; | |
| 43 | for (channel = 0; channel < nchannels; channel++) { | |
| 44 | snd_assert(src_channels->area.first % 8 == 0 && | |
| 45 | src_channels->area.step % 8 == 0, | |
| 46 | return -ENXIO); | |
| 47 | snd_assert(dst_channels->area.first % 8 == 0 && | |
| 48 | dst_channels->area.step % 8 == 0, | |
| 49 | return -ENXIO); | |
| 50 | if (!src_channels->enabled) { | |
| 51 | if (dst_channels->wanted) | |
| 52 | snd_pcm_area_silence(&dst_channels->area, 0, frames, plugin->dst_format.format); | |
| 53 | dst_channels->enabled = 0; | |
| 54 | continue; | |
| 55 | } | |
| 56 | dst_channels->enabled = 1; | |
| 57 | snd_pcm_area_copy(&src_channels->area, 0, &dst_channels->area, 0, frames, plugin->src_format.format); | |
| 58 | src_channels++; | |
| 59 | dst_channels++; | |
| 60 | } | |
| 61 | return frames; | |
| 62 | } | |
| 63 | ||
| 6ac77bc1 TI |
64 | int snd_pcm_plugin_build_copy(struct snd_pcm_substream *plug, |
| 65 | struct snd_pcm_plugin_format *src_format, | |
| 66 | struct snd_pcm_plugin_format *dst_format, | |
| 67 | struct snd_pcm_plugin **r_plugin) | |
| 1da177e4 LT |
68 | { |
| 69 | int err; | |
| 6ac77bc1 | 70 | struct snd_pcm_plugin *plugin; |
| 1da177e4 LT |
71 | int width; |
| 72 | ||
| 73 | snd_assert(r_plugin != NULL, return -ENXIO); | |
| 74 | *r_plugin = NULL; | |
| 75 | ||
| 76 | snd_assert(src_format->format == dst_format->format, return -ENXIO); | |
| 77 | snd_assert(src_format->rate == dst_format->rate, return -ENXIO); | |
| 78 | snd_assert(src_format->channels == dst_format->channels, return -ENXIO); | |
| 79 | ||
| 80 | width = snd_pcm_format_physical_width(src_format->format); | |
| 81 | snd_assert(width > 0, return -ENXIO); | |
| 82 | ||
| 83 | err = snd_pcm_plugin_build(plug, "copy", src_format, dst_format, | |
| 84 | 0, &plugin); | |
| 85 | if (err < 0) | |
| 86 | return err; | |
| 87 | plugin->transfer = copy_transfer; | |
| 88 | *r_plugin = plugin; | |
| 89 | return 0; | |
| 90 | } | |
| 21a3479a JK |
91 | |
| 92 | #endif |