[deliverable/linux.git] / sound / core / oss / io.c

/*
 *  PCM I/O Plug-In Interface
 *  Copyright (c) 1999 by Jaroslav Kysela <perex@suse.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 <sound/driver.h>

#ifdef CONFIG_SND_PCM_OSS_PLUGINS

#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,1)
#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,1)

/*
 *  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)
{
	snd_assert(plugin != NULL, return -ENXIO);
	snd_assert(src_channels != NULL, 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;
		snd_assert(bufs != NULL, 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)
{
	snd_assert(plugin != NULL, return -ENXIO);
	snd_assert(dst_channels != NULL, 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;
		snd_assert(bufs != NULL, 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;

	snd_assert(r_plugin != NULL, return -ENXIO);
	*r_plugin = NULL;
	snd_assert(plug != NULL && params != NULL, 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;
}

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* PCM I/O Plug-In Interface
	3	* Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
	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 CONFIG_SND_PCM_OSS_PLUGINS
	25
1da177e4 LT	26	#include <linux/time.h>
	27	#include <sound/core.h>
	28	#include <sound/pcm.h>
	29	#include <sound/pcm_params.h>
	30	#include "pcm_plugin.h"
	31
	32	#define pcm_write(plug,buf,count) snd_pcm_oss_write3(plug,buf,count,1)
	33	#define pcm_writev(plug,vec,count) snd_pcm_oss_writev3(plug,vec,count,1)
	34	#define pcm_read(plug,buf,count) snd_pcm_oss_read3(plug,buf,count,1)
	35	#define pcm_readv(plug,vec,count) snd_pcm_oss_readv3(plug,vec,count,1)
	36
	37	/*
	38	* Basic io plugin
	39	*/
	40
6ac77bc1 TI	41	static snd_pcm_sframes_t io_playback_transfer(struct snd_pcm_plugin *plugin,
	42	const struct snd_pcm_plugin_channel *src_channels,
	43	struct snd_pcm_plugin_channel *dst_channels,
1da177e4 LT	44	snd_pcm_uframes_t frames)
	45	{
	46	snd_assert(plugin != NULL, return -ENXIO);
	47	snd_assert(src_channels != NULL, return -ENXIO);
	48	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
	49	return pcm_write(plugin->plug, src_channels->area.addr, frames);
	50	} else {
	51	int channel, channels = plugin->dst_format.channels;
	52	void bufs = (void)plugin->extra_data;
	53	snd_assert(bufs != NULL, return -ENXIO);
	54	for (channel = 0; channel < channels; channel++) {
	55	if (src_channels[channel].enabled)
	56	bufs[channel] = src_channels[channel].area.addr;
	57	else
	58	bufs[channel] = NULL;
	59	}
	60	return pcm_writev(plugin->plug, bufs, frames);
	61	}
	62	}
	63
6ac77bc1 TI	64	static snd_pcm_sframes_t io_capture_transfer(struct snd_pcm_plugin *plugin,
	65	const struct snd_pcm_plugin_channel *src_channels,
	66	struct snd_pcm_plugin_channel *dst_channels,
1da177e4 LT	67	snd_pcm_uframes_t frames)
	68	{
	69	snd_assert(plugin != NULL, return -ENXIO);
	70	snd_assert(dst_channels != NULL, return -ENXIO);
	71	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
	72	return pcm_read(plugin->plug, dst_channels->area.addr, frames);
	73	} else {
	74	int channel, channels = plugin->dst_format.channels;
	75	void bufs = (void)plugin->extra_data;
	76	snd_assert(bufs != NULL, return -ENXIO);
	77	for (channel = 0; channel < channels; channel++) {
	78	if (dst_channels[channel].enabled)
	79	bufs[channel] = dst_channels[channel].area.addr;
	80	else
	81	bufs[channel] = NULL;
	82	}
	83	return pcm_readv(plugin->plug, bufs, frames);
	84	}
	85	return 0;
	86	}
	87
6ac77bc1	88	static snd_pcm_sframes_t io_src_channels(struct snd_pcm_plugin *plugin,
1da177e4	89	snd_pcm_uframes_t frames,
6ac77bc1	90	struct snd_pcm_plugin_channel **channels)
1da177e4 LT	91	{
	92	int err;
	93	unsigned int channel;
6ac77bc1	94	struct snd_pcm_plugin_channel *v;
1da177e4 LT	95	err = snd_pcm_plugin_client_channels(plugin, frames, &v);
	96	if (err < 0)
	97	return err;
	98	*channels = v;
	99	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
	100	for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v)
	101	v->wanted = 1;
	102	}
	103	return frames;
	104	}
	105
6ac77bc1 TI	106	int snd_pcm_plugin_build_io(struct snd_pcm_substream *plug,
	107	struct snd_pcm_hw_params *params,
	108	struct snd_pcm_plugin **r_plugin)
1da177e4 LT	109	{
1da177e4 LT	110	int err;
6ac77bc1 TI	111	struct snd_pcm_plugin_format format;
6ac77bc1 TI	112	struct snd_pcm_plugin *plugin;
1da177e4 LT	113
	114	snd_assert(r_plugin != NULL, return -ENXIO);
	115	*r_plugin = NULL;
	116	snd_assert(plug != NULL && params != NULL, return -ENXIO);
	117	format.format = params_format(params);
	118	format.rate = params_rate(params);
	119	format.channels = params_channels(params);
	120	err = snd_pcm_plugin_build(plug, "I/O io",
	121	&format, &format,
	122	sizeof(void ) format.channels,
	123	&plugin);
	124	if (err < 0)
	125	return err;
	126	plugin->access = params_access(params);
	127	if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
	128	plugin->transfer = io_playback_transfer;
	129	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
	130	plugin->client_channels = io_src_channels;
	131	} else {
	132	plugin->transfer = io_capture_transfer;
	133	}
	134
	135	*r_plugin = plugin;
	136	return 0;
	137	}
21a3479a JK	138
21a3479a JK	139	#endif