linux/sound/core/oss/linear.c

/*
 *  Linear conversion Plug-In
 *  Copyright (c) 1999 by Jaroslav Kysela <[email protected]>,
 *			  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"

/*
 *  Basic linear conversion plugin
 */
 
struct linear_priv { … };

static inline void do_convert(struct linear_priv *data,
			      unsigned char *dst, unsigned char *src)
{ … }

static void convert(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)
{ … }

static snd_pcm_sframes_t linear_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)
{ … }

static void init_data(struct linear_priv *data,
		      snd_pcm_format_t src_format, snd_pcm_format_t dst_format)
{ … }

int snd_pcm_plugin_build_linear(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)
{ … }