forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.8 KiB
92 lines
2.8 KiB
/* |
|
* Linear conversion Plug-In |
|
* Copyright (c) 2000 by Abramo Bagnara <[email protected]> |
|
* |
|
* |
|
* 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 "pcm_plugin.h" |
|
|
|
static snd_pcm_sframes_t copy_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) |
|
{ |
|
unsigned int channel; |
|
unsigned int nchannels; |
|
|
|
if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) |
|
return -ENXIO; |
|
if (frames == 0) |
|
return 0; |
|
nchannels = plugin->src_format.channels; |
|
for (channel = 0; channel < nchannels; channel++) { |
|
if (snd_BUG_ON(src_channels->area.first % 8 || |
|
src_channels->area.step % 8)) |
|
return -ENXIO; |
|
if (snd_BUG_ON(dst_channels->area.first % 8 || |
|
dst_channels->area.step % 8)) |
|
return -ENXIO; |
|
if (!src_channels->enabled) { |
|
if (dst_channels->wanted) |
|
snd_pcm_area_silence(&dst_channels->area, 0, frames, plugin->dst_format.format); |
|
dst_channels->enabled = 0; |
|
continue; |
|
} |
|
dst_channels->enabled = 1; |
|
snd_pcm_area_copy(&src_channels->area, 0, &dst_channels->area, 0, frames, plugin->src_format.format); |
|
src_channels++; |
|
dst_channels++; |
|
} |
|
return frames; |
|
} |
|
|
|
int snd_pcm_plugin_build_copy(struct snd_pcm_substream *plug, |
|
struct snd_pcm_plugin_format *src_format, |
|
struct snd_pcm_plugin_format *dst_format, |
|
struct snd_pcm_plugin **r_plugin) |
|
{ |
|
int err; |
|
struct snd_pcm_plugin *plugin; |
|
int width; |
|
|
|
if (snd_BUG_ON(!r_plugin)) |
|
return -ENXIO; |
|
*r_plugin = NULL; |
|
|
|
if (snd_BUG_ON(src_format->format != dst_format->format)) |
|
return -ENXIO; |
|
if (snd_BUG_ON(src_format->rate != dst_format->rate)) |
|
return -ENXIO; |
|
if (snd_BUG_ON(src_format->channels != dst_format->channels)) |
|
return -ENXIO; |
|
|
|
width = snd_pcm_format_physical_width(src_format->format); |
|
if (snd_BUG_ON(width <= 0)) |
|
return -ENXIO; |
|
|
|
err = snd_pcm_plugin_build(plug, "copy", src_format, dst_format, |
|
0, &plugin); |
|
if (err < 0) |
|
return err; |
|
plugin->transfer = copy_transfer; |
|
*r_plugin = plugin; |
|
return 0; |
|
}
|
|
|