mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 17:21:49 +00:00
fea952e5cc
Change the core code where sparse complains. In most cases, this means just adding annotations to confirm that we indeed want to do the dirty things we're doing. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
|
|
* Route Plug-In
|
|
* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
|
|
*
|
|
*
|
|
* 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 void zero_areas(struct snd_pcm_plugin_channel *dvp, int ndsts,
|
|
snd_pcm_uframes_t frames, snd_pcm_format_t format)
|
|
{
|
|
int dst = 0;
|
|
for (; dst < ndsts; ++dst) {
|
|
if (dvp->wanted)
|
|
snd_pcm_area_silence(&dvp->area, 0, frames, format);
|
|
dvp->enabled = 0;
|
|
dvp++;
|
|
}
|
|
}
|
|
|
|
static inline void copy_area(const struct snd_pcm_plugin_channel *src_channel,
|
|
struct snd_pcm_plugin_channel *dst_channel,
|
|
snd_pcm_uframes_t frames, snd_pcm_format_t format)
|
|
{
|
|
dst_channel->enabled = 1;
|
|
snd_pcm_area_copy(&src_channel->area, 0, &dst_channel->area, 0, frames, format);
|
|
}
|
|
|
|
static snd_pcm_sframes_t route_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)
|
|
{
|
|
int nsrcs, ndsts, dst;
|
|
struct snd_pcm_plugin_channel *dvp;
|
|
snd_pcm_format_t format;
|
|
|
|
if (snd_BUG_ON(!plugin || !src_channels || !dst_channels))
|
|
return -ENXIO;
|
|
if (frames == 0)
|
|
return 0;
|
|
|
|
nsrcs = plugin->src_format.channels;
|
|
ndsts = plugin->dst_format.channels;
|
|
|
|
format = plugin->dst_format.format;
|
|
dvp = dst_channels;
|
|
if (nsrcs <= 1) {
|
|
/* expand to all channels */
|
|
for (dst = 0; dst < ndsts; ++dst) {
|
|
copy_area(src_channels, dvp, frames, format);
|
|
dvp++;
|
|
}
|
|
return frames;
|
|
}
|
|
|
|
for (dst = 0; dst < ndsts && dst < nsrcs; ++dst) {
|
|
copy_area(src_channels, dvp, frames, format);
|
|
dvp++;
|
|
src_channels++;
|
|
}
|
|
if (dst < ndsts)
|
|
zero_areas(dvp, ndsts - dst, frames, format);
|
|
return frames;
|
|
}
|
|
|
|
int snd_pcm_plugin_build_route(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)
|
|
{
|
|
struct snd_pcm_plugin *plugin;
|
|
int err;
|
|
|
|
if (snd_BUG_ON(!r_plugin))
|
|
return -ENXIO;
|
|
*r_plugin = NULL;
|
|
if (snd_BUG_ON(src_format->rate != dst_format->rate))
|
|
return -ENXIO;
|
|
if (snd_BUG_ON(src_format->format != dst_format->format))
|
|
return -ENXIO;
|
|
|
|
err = snd_pcm_plugin_build(plug, "route conversion",
|
|
src_format, dst_format, 0, &plugin);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
plugin->transfer = route_transfer;
|
|
*r_plugin = plugin;
|
|
return 0;
|
|
}
|