/* *  PCM Plug-In shared (kernel/library) code *  Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz> *  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 * */  #if 0#define PLUGIN_DEBUG#endif#include <sound/driver.h>#include <linux/slab.h>#include <linux/time.h>#include <linux/vmalloc.h>#include <sound/core.h>#include <sound/pcm.h>#include <sound/pcm_params.h>#include "pcm_plugin.h"#define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first)#define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last)static int snd_pcm_plugin_src_channels_mask(snd_pcm_plugin_t *plugin,					    bitset_t *dst_vmask,					    bitset_t **src_vmask){	bitset_t *vmask = plugin->src_vmask;	bitset_copy(vmask, dst_vmask, plugin->src_format.channels);	*src_vmask = vmask;	return 0;}static int snd_pcm_plugin_dst_channels_mask(snd_pcm_plugin_t *plugin,					    bitset_t *src_vmask,					    bitset_t **dst_vmask){	bitset_t *vmask = plugin->dst_vmask;	bitset_copy(vmask, src_vmask, plugin->dst_format.channels);	*dst_vmask = vmask;	return 0;}/* *  because some cards might have rates "very close", we ignore *  all "resampling" requests within +-5% */static int rate_match(unsigned int src_rate, unsigned int dst_rate){	unsigned int low = (src_rate * 95) / 100;	unsigned int high = (src_rate * 105) / 100;	return dst_rate >= low && dst_rate <= high;}static int snd_pcm_plugin_alloc(snd_pcm_plugin_t *plugin, snd_pcm_uframes_t frames){	snd_pcm_plugin_format_t *format;	ssize_t width;	size_t size;	unsigned int channel;	snd_pcm_plugin_channel_t *c;	if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {		format = &plugin->src_format;	} else {		format = &plugin->dst_format;	}	if ((width = snd_pcm_format_physical_width(format->format)) < 0)		return width;	size = frames * format->channels * width;	snd_assert((size % 8) == 0, return -ENXIO);	size /= 8;	if (plugin->buf_frames < frames) {		if (plugin->buf)			vfree(plugin->buf);		plugin->buf = vmalloc(size);		plugin->buf_frames = frames;	}	if (!plugin->buf) {		plugin->buf_frames = 0;		return -ENOMEM;	}	c = plugin->buf_channels;	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {		for (channel = 0; channel < format->channels; channel++, c++) {			c->frames = frames;			c->enabled = 1;			c->wanted = 0;			c->area.addr = plugin->buf;			c->area.first = channel * width;			c->area.step = format->channels * width;		}	} else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {		snd_assert((size % format->channels) == 0,);		size /= format->channels;		for (channel = 0; channel < format->channels; channel++, c++) {			c->frames = frames;			c->enabled = 1;			c->wanted = 0;			c->area.addr = plugin->buf + (channel * size);			c->area.first = 0;			c->area.step = width;		}	} else		return -EINVAL;	return 0;}int snd_pcm_plug_alloc(snd_pcm_plug_t *plug, snd_pcm_uframes_t frames){	int err;	snd_assert(snd_pcm_plug_first(plug) != NULL, return -ENXIO);	if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {		snd_pcm_plugin_t *plugin = snd_pcm_plug_first(plug);		while (plugin->next) {			if (plugin->dst_frames)				frames = plugin->dst_frames(plugin, frames);			snd_assert(frames > 0, return -ENXIO);			plugin = plugin->next;			err = snd_pcm_plugin_alloc(plugin, frames);			if (err < 0)				return err;		}	} else {		snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);		while (plugin->prev) {			if (plugin->src_frames)				frames = plugin->src_frames(plugin, frames);			snd_assert(frames > 0, return -ENXIO);			plugin = plugin->prev;			err = snd_pcm_plugin_alloc(plugin, frames);			if (err < 0)				return err;		}	}	return 0;}snd_pcm_sframes_t snd_pcm_plugin_client_channels(snd_pcm_plugin_t *plugin,				       snd_pcm_uframes_t frames,				       snd_pcm_plugin_channel_t **channels){	*channels = plugin->buf_channels;	return frames;}int snd_pcm_plugin_build(snd_pcm_plug_t *plug,			 const char *name,			 snd_pcm_plugin_format_t *src_format,			 snd_pcm_plugin_format_t *dst_format,			 size_t extra,			 snd_pcm_plugin_t **ret){	snd_pcm_plugin_t *plugin;	unsigned int channels;		snd_assert(plug != NULL, return -ENXIO);	snd_assert(src_format != NULL && dst_format != NULL, return -ENXIO);	plugin = (snd_pcm_plugin_t *)snd_kcalloc(sizeof(*plugin) + extra, GFP_KERNEL);	if (plugin == NULL)		return -ENOMEM;	plugin->name = name;	plugin->plug = plug;	plugin->stream = snd_pcm_plug_stream(plug);	plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;	plugin->src_format = *src_format;	plugin->src_width = snd_pcm_format_physical_width(src_format->format);	snd_assert(plugin->src_width > 0, );	plugin->dst_format = *dst_format;	plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);	snd_assert(plugin->dst_width > 0, );	if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)		channels = src_format->channels;	else		channels = dst_format->channels;	plugin->buf_channels = snd_kcalloc(channels * sizeof(*plugin->buf_channels), GFP_KERNEL);	if (plugin->buf_channels == NULL) {		snd_pcm_plugin_free(plugin);		return -ENOMEM;	}	plugin->src_vmask = bitset_alloc(src_format->channels);	if (plugin->src_vmask == NULL) {		snd_pcm_plugin_free(plugin);		return -ENOMEM;	}	plugin->dst_vmask = bitset_alloc(dst_format->channels);	if (plugin->dst_vmask == NULL) {		snd_pcm_plugin_free(plugin);		return -ENOMEM;	}	plugin->client_channels = snd_pcm_plugin_client_channels;	plugin->src_channels_mask = snd_pcm_plugin_src_channels_mask;	plugin->dst_channels_mask = snd_pcm_plugin_dst_channels_mask;	*ret = plugin;	return 0;}int snd_pcm_plugin_free(snd_pcm_plugin_t *plugin){	if (! plugin)		return 0;	if (plugin->private_free)		plugin->private_free(plugin);	if (plugin->buf_channels)		kfree(plugin->buf_channels);	if (plugin->buf)		vfree(plugin->buf);	if (plugin->src_vmask)		kfree(plugin->src_vmask);	if (plugin->dst_vmask)		kfree(plugin->dst_vmask);	kfree(plugin);	return 0;}snd_pcm_sframes_t snd_pcm_plug_client_size(snd_pcm_plug_t *plug, snd_pcm_uframes_t drv_frames){	snd_pcm_plugin_t *plugin, *plugin_prev, *plugin_next;	int stream = snd_pcm_plug_stream(plug);	snd_assert(plug != NULL, return -ENXIO);	if (drv_frames == 0)		return 0;	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {		plugin = snd_pcm_plug_last(plug);		while (plugin && drv_frames > 0) {			plugin_prev = plugin->prev;			if (plugin->src_frames)				drv_frames = plugin->src_frames(plugin, drv_frames);			plugin = plugin_prev;		}	} else if (stream == SNDRV_PCM_STREAM_CAPTURE) {		plugin = snd_pcm_plug_first(plug);		while (plugin && drv_frames > 0) {			plugin_next = plugin->next;			if (plugin->dst_frames)				drv_frames = plugin->dst_frames(plugin, drv_frames);			plugin = plugin_next;		}	} else		snd_BUG();	return drv_frames;}snd_pcm_sframes_t snd_pcm_plug_slave_size(snd_pcm_plug_t *plug, snd_pcm_uframes_t clt_frames){	snd_pcm_plugin_t *plugin, *plugin_prev, *plugin_next;	snd_pcm_sframes_t frames;	int stream = snd_pcm_plug_stream(plug);		snd_assert(plug != NULL, return -ENXIO);	if (clt_frames == 0)		return 0;	frames = clt_frames;	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {		plugin = snd_pcm_plug_first(plug);		while (plugin && frames > 0) {			plugin_next = plugin->next;			if (plugin->dst_frames) {				frames = plugin->dst_frames(plugin, frames);				if (frames < 0)					return frames;			}			plugin = plugin_next;		}	} else if (stream == SNDRV_PCM_STREAM_CAPTURE) {		plugin = snd_pcm_plug_last(plug);		while (plugin) {			plugin_prev = plugin->prev;			if (plugin->src_frames) {				frames = plugin->src_frames(plugin, frames);				if (frames < 0)					return frames;			}			plugin = plugin_prev;		}	} else		snd_BUG();	return frames;}static int snd_pcm_plug_formats(snd_mask_t *mask, int format){	snd_mask_t formats = *mask;	u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |		       SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |		       SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |		       SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |		       SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |		       SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |		       SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);	snd_mask_set(&formats, SNDRV_PCM_FORMAT_MU_LAW);		if (formats.bits[0] & (u32)linfmts)		formats.bits[0] |= (u32)linfmts;	if (formats.bits[1] & (u32)(linfmts >> 32))		formats.bits[1] |= (u32)(linfmts >> 32);	return snd_mask_test(&formats, format);}static int preferred_formats[] = {	SNDRV_PCM_FORMAT_S16_LE,	SNDRV_PCM_FORMAT_S16_BE,	SNDRV_PCM_FORMAT_U16_LE,	SNDRV_PCM_FORMAT_U16_BE,	SNDRV_PCM_FORMAT_S24_LE,	SNDRV_PCM_FORMAT_S24_BE,	SNDRV_PCM_FORMAT_U24_LE,	SNDRV_PCM_FORMAT_U24_BE,	SNDRV_PCM_FORMAT_S32_LE,	SNDRV_PCM_FORMAT_S32_BE,	SNDRV_PCM_FORMAT_U32_LE,	SNDRV_PCM_FORMAT_U32_BE,	SNDRV_PCM_FORMAT_S8,	SNDRV_PCM_FORMAT_U8};int snd_pcm_plug_slave_format(int format, snd_mask_t *format_mask){	if (snd_mask_test(format_mask, format))		return format;	if (! snd_pcm_plug_formats(format_mask, format))		return -EINVAL;	if (snd_pcm_format_linear(format)) {		int width = snd_pcm_format_width(format);		int unsignd = snd_pcm_format_unsigned(format);		int big = snd_pcm_format_big_endian(format);		int format1;		int wid, width1=width;		int dwidth1 = 8;		for (wid = 0; wid < 4; ++wid) {			int end, big1 = big;			for (end = 0; end < 2; ++end) {				int sgn, unsignd1 = unsignd;				for (sgn = 0; sgn < 2; ++sgn) {					format1 = snd_pcm_build_linear_format(width1, unsignd1, big1);					if (format1 >= 0 &&					    snd_mask_test(format_mask, format1))						goto _found;					unsignd1 = !unsignd1;				}				big1 = !big1;			}			if (width1 == 32) {				dwidth1 = -dwidth1;				width1 = width;			}			width1 += dwidth1;		}		return -EINVAL;	_found:		return format1;	} else {		unsigned int i;		switch (format) {		case SNDRV_PCM_FORMAT_MU_LAW:			for (i = 0; i < sizeof(preferred_formats) / sizeof(preferred_formats[0]); ++i) {				int format1 = preferred_formats[i];				if (snd_mask_test(format_mask, format1))					return format1;			}		default:			return -EINVAL;		}	}}int snd_pcm_plug_format_plugins(snd_pcm_plug_t *plug,				snd_pcm_hw_params_t *params,				snd_pcm_hw_params_t *slave_params){	snd_pcm_plugin_format_t tmpformat;	snd_pcm_plugin_format_t dstformat;	snd_pcm_plugin_format_t srcformat;	int src_access, dst_access;	snd_pcm_plugin_t *plugin = NULL;	int err, first;	int stream = snd_pcm_plug_stream(plug);	int slave_interleaved = (params_channels(slave_params) == 1 ||				 params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);	switch (stream) {	case SNDRV_PCM_STREAM_PLAYBACK:		dstformat.format = params_format(slave_params);		dstformat.rate = params_rate(slave_params);		dstformat.channels = params_channels(slave_params);		srcformat.format = params_format(params);		srcformat.rate = params_rate(params);		srcformat.channels = params_channels(params);		src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;		dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :						  SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);		break;	case SNDRV_PCM_STREAM_CAPTURE:		dstformat.format = params_format(params);		dstformat.rate = params_rate(params);		dstformat.channels = params_channels(params);		srcformat.format = params_format(slave_params);		srcformat.rate = params_rate(slave_params);		srcformat.channels = params_channels(slave_params);		src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :						  SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);		dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;		break;	default:		snd_BUG();		return -EINVAL;	}	tmpformat = srcformat;			pdprintf("srcformat: format=%i, rate=%i, channels=%i\n", 		 srcformat.format,		 srcformat.rate,		 srcformat.channels);	pdprintf("dstformat: format=%i, rate=%i, channels=%i\n", 		 dstformat.format,		 dstformat.rate,		 dstformat.channels);	/* Format change (linearization) */	if ((srcformat.format != dstformat.format ||	     !rate_match(srcformat.rate, dstformat.rate) ||	     srcformat.channels != dstformat.channels) &&	    !snd_pcm_format_linear(srcformat.format)) {		if (snd_pcm_format_linear(dstformat.format))			tmpformat.format = dstformat.format;		else			tmpformat.format = SNDRV_PCM_FORMAT_S16;		first = plugin == NULL;		switch (srcformat.format) {		case SNDRV_PCM_FORMAT_MU_LAW:			err = snd_pcm_plugin_build_mulaw(plug,							 &srcformat, &tmpformat,							 &plugin);			break;		default:			return -EINVAL;		}		pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);		if (err < 0)			return err;		err = snd_pcm_plugin_append(plugin);		if (err < 0) {			snd_pcm_plugin_free(plugin);			return err;		}		srcformat = tmpformat;		src_access = dst_access;	}	/* channels reduction */	if (srcformat.channels > dstformat.channels) {		int sv = srcformat.channels;		int dv = dstformat.channels;		route_ttable_entry_t *ttable = snd_kcalloc(dv*sv*sizeof(*ttable), GFP_KERNEL);		if (ttable == NULL)			return -ENOMEM;#if 1		if (sv == 2 && dv == 1) {			ttable[0] = HALF;			ttable[1] = HALF;		} else#endif		{			int v;			for (v = 0; v < dv; ++v)				ttable[v * sv + v] = FULL;		}		tmpformat.channels = dstformat.channels;		if (rate_match(srcformat.rate, dstformat.rate) &&		    snd_pcm_format_linear(dstformat.format))			tmpformat.format = dstformat.format;		err = snd_pcm_plugin_build_route(plug,						 &srcformat, &tmpformat,						 ttable, &plugin);		kfree(ttable);		pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);		if (err < 0) {			snd_pcm_plugin_free(plugin);			return err;		}		err = snd_pcm_plugin_append(plugin);		if (err < 0) {			snd_pcm_plugin_free(plugin);			return err;		}		srcformat = tmpformat;		src_access = dst_access;	}	/* rate resampling */	if (!rate_match(srcformat.rate, dstformat.rate)) {		tmpformat.rate = dstformat.rate;		if (srcformat.channels == dstformat.channels &&		    snd_pcm_format_linear(dstformat.format))			tmpformat.format = dstformat.format;