src/pcm/pcm_lfloat.c - manifest_repos/alsa-lib - Git at Google

 /**
  * \file pcm/pcm_lfloat.c
  * \ingroup PCM_Plugins
  * \brief PCM Linear<->Float Conversion Plugin Interface
  * \author Jaroslav Kysela <perex@perex.cz>
  * \date 2001
  */
 /*
  *  PCM - Linear Integer <-> Linear Float conversion
  *  Copyright (c) 2001 by Jaroslav Kysela <perex@perex.cz>
  *
  *
  *   This library is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU Lesser General Public License as
  *   published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser 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 <byteswap.h>
 #include "pcm_local.h"
 #include "pcm_plugin.h"

 #include "plugin_ops.h"

 #ifndef DOC_HIDDEN

 typedef float float_t;
 typedef double double_t;

 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ <= 91)
 #define BUGGY_GCC
 #endif

 #ifndef PIC
 /* entry for static linking */
 const char *_snd_module_pcm_lfloat = "";
 #endif

 typedef struct {
 	/* This field need to be the first */
 	snd_pcm_plugin_t plug;
 	unsigned int int32_idx;
 	unsigned int float32_idx;
 	snd_pcm_format_t sformat;
 	void (*func)(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
 		     const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
 		     unsigned int channels, snd_pcm_uframes_t frames,
 		     unsigned int get32idx, unsigned int put32floatidx);
 } snd_pcm_lfloat_t;

 int snd_pcm_lfloat_get_s32_index(snd_pcm_format_t format)
 {
 	int width, endian;

 	switch (format) {
 	case SND_PCM_FORMAT_FLOAT_LE:
 	case SND_PCM_FORMAT_FLOAT_BE:
 		width = 32;
 		break;
 	case SND_PCM_FORMAT_FLOAT64_LE:
 	case SND_PCM_FORMAT_FLOAT64_BE:
 		width = 64;
 		break;
 	default:
 		return -EINVAL;
 	}
 #ifdef SND_LITTLE_ENDIAN
 	endian = snd_pcm_format_big_endian(format);
 #else
 	endian = snd_pcm_format_little_endian(format);
 #endif
 	return ((width / 32)-1) * 2 + endian;
 }

 int snd_pcm_lfloat_put_s32_index(snd_pcm_format_t format)
 {
 	return snd_pcm_lfloat_get_s32_index(format);
 }

 #endif /* DOC_HIDDEN */

 #ifndef BUGGY_GCC

 #ifndef DOC_HIDDEN

 void snd_pcm_lfloat_convert_integer_float(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
 					  const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
 					  unsigned int channels, snd_pcm_uframes_t frames,
 					  unsigned int get32idx, unsigned int put32floatidx)
 {
 #define GET32_LABELS
 #define PUT32F_LABELS
 #include "plugin_ops.h"
 #undef PUT32F_LABELS
 #undef GET32_LABELS
 	void *get32 = get32_labels[get32idx];
 	void *put32float = put32float_labels[put32floatidx];
 	unsigned int channel;
 	for (channel = 0; channel < channels; ++channel) {
 		const char *src;
 		char *dst;
 		int src_step, dst_step;
 		snd_pcm_uframes_t frames1;
 		int32_t sample = 0;
 		snd_tmp_float_t tmp_float;
 		snd_tmp_double_t tmp_double;
 		const snd_pcm_channel_area_t *src_area = &src_areas[channel];
 		const snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
 		src = snd_pcm_channel_area_addr(src_area, src_offset);
 		dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
 		src_step = snd_pcm_channel_area_step(src_area);
 		dst_step = snd_pcm_channel_area_step(dst_area);
 		frames1 = frames;
 		while (frames1-- > 0) {
 			goto *get32;
 #define GET32_END sample_loaded
 #include "plugin_ops.h"
 #undef GET32_END
 		sample_loaded:
 			goto *put32float;
 #define PUT32F_END sample_put
 #include "plugin_ops.h"
 #undef PUT32F_END
 		sample_put:
 			src += src_step;
 			dst += dst_step;
 		}
 	}
 }

 void snd_pcm_lfloat_convert_float_integer(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
 					  const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
 					  unsigned int channels, snd_pcm_uframes_t frames,
 					  unsigned int put32idx, unsigned int get32floatidx)
 {
 #define PUT32_LABELS
 #define GET32F_LABELS
 #include "plugin_ops.h"
 #undef GET32F_LABELS
 #undef PUT32_LABELS
 	void *put32 = put32_labels[put32idx];
 	void *get32float = get32float_labels[get32floatidx];
 	unsigned int channel;
 	for (channel = 0; channel < channels; ++channel) {
 		const char *src;
 		char *dst;
 		int src_step, dst_step;
 		snd_pcm_uframes_t frames1;
 		int32_t sample = 0;
 		snd_tmp_float_t tmp_float;
 		snd_tmp_double_t tmp_double;
 		const snd_pcm_channel_area_t *src_area = &src_areas[channel];
 		const snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
 		src = snd_pcm_channel_area_addr(src_area, src_offset);
 		dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
 		src_step = snd_pcm_channel_area_step(src_area);
 		dst_step = snd_pcm_channel_area_step(dst_area);
 		frames1 = frames;
 		while (frames1-- > 0) {
 			goto *get32float;
 #define GET32F_END sample_loaded
 #include "plugin_ops.h"
 #undef GET32F_END
 		sample_loaded:
 			goto *put32;
 #define PUT32_END sample_put
 #include "plugin_ops.h"
 #undef PUT32_END
 		sample_put:
 			src += src_step;
 			dst += dst_step;
 		}
 	}
 }

 #endif /* DOC_HIDDEN */

 static int snd_pcm_lfloat_hw_refine_cprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 {
 	snd_pcm_lfloat_t *lfloat = pcm->private_data;
 	int err;
 	snd_pcm_access_mask_t access_mask = { SND_PCM_ACCBIT_SHM };
 	snd_pcm_format_mask_t lformat_mask = { SND_PCM_FMTBIT_LINEAR };
 	snd_pcm_format_mask_t fformat_mask = { SND_PCM_FMTBIT_FLOAT };
 	err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_ACCESS,
 					 &access_mask);
 	if (err < 0)
 		return err;
 	err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_FORMAT,
 					 snd_pcm_format_linear(lfloat->sformat) ?
 					 &fformat_mask : &lformat_mask);
 	if (err < 0)
 		return err;
 	err = _snd_pcm_hw_params_set_subformat(params, SND_PCM_SUBFORMAT_STD);
 	if (err < 0)
 		return err;
 	params->info &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID);
 	return 0;
 }

 static int snd_pcm_lfloat_hw_refine_sprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *sparams)
 {
 	snd_pcm_lfloat_t *lfloat = pcm->private_data;
 	snd_pcm_access_mask_t saccess_mask = { SND_PCM_ACCBIT_MMAP };
 	_snd_pcm_hw_params_any(sparams);
 	_snd_pcm_hw_param_set_mask(sparams, SND_PCM_HW_PARAM_ACCESS,
 				   &saccess_mask);
 	_snd_pcm_hw_params_set_format(sparams, lfloat->sformat);
 	_snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
 	return 0;
 }

 static int snd_pcm_lfloat_hw_refine_schange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
 					    snd_pcm_hw_params_t *sparams)
 {
 	int err;
 	unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS |
 			      SND_PCM_HW_PARBIT_RATE |
 			      SND_PCM_HW_PARBIT_PERIOD_SIZE |
 			      SND_PCM_HW_PARBIT_BUFFER_SIZE |
 			      SND_PCM_HW_PARBIT_PERIODS |
 			      SND_PCM_HW_PARBIT_PERIOD_TIME |
 			      SND_PCM_HW_PARBIT_BUFFER_TIME |
 			      SND_PCM_HW_PARBIT_TICK_TIME);
 	err = _snd_pcm_hw_params_refine(sparams, links, params);
 	if (err < 0)
 		return err;
 	return 0;
 }

 static int snd_pcm_lfloat_hw_refine_cchange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
 					    snd_pcm_hw_params_t *sparams)
 {
 	int err;
 	unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS |
 			      SND_PCM_HW_PARBIT_RATE |
 			      SND_PCM_HW_PARBIT_PERIOD_SIZE |
 			      SND_PCM_HW_PARBIT_BUFFER_SIZE |
 			      SND_PCM_HW_PARBIT_PERIODS |
 			      SND_PCM_HW_PARBIT_PERIOD_TIME |
 			      SND_PCM_HW_PARBIT_BUFFER_TIME |
 			      SND_PCM_HW_PARBIT_TICK_TIME);
 	err = _snd_pcm_hw_params_refine(params, links, sparams);
 	if (err < 0)
 		return err;
 	return 0;
 }

 static int snd_pcm_lfloat_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 {
 	return snd_pcm_hw_refine_slave(pcm, params,
 				       snd_pcm_lfloat_hw_refine_cprepare,
 				       snd_pcm_lfloat_hw_refine_cchange,
 				       snd_pcm_lfloat_hw_refine_sprepare,
 				       snd_pcm_lfloat_hw_refine_schange,
 				       snd_pcm_generic_hw_refine);
 }

 static int snd_pcm_lfloat_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 {
 	snd_pcm_lfloat_t *lfloat = pcm->private_data;
 	snd_pcm_t *slave = lfloat->plug.gen.slave;
 	snd_pcm_format_t src_format, dst_format;
 	int err = snd_pcm_hw_params_slave(pcm, params,
 					  snd_pcm_lfloat_hw_refine_cchange,
 					  snd_pcm_lfloat_hw_refine_sprepare,
 					  snd_pcm_lfloat_hw_refine_schange,
 					  snd_pcm_generic_hw_params);
 	if (err < 0)
 		return err;
 	if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
 		err = INTERNAL(snd_pcm_hw_params_get_format)(params, &src_format);
 		dst_format = slave->format;
 	} else {
 		src_format = slave->format;
 		err = INTERNAL(snd_pcm_hw_params_get_format)(params, &dst_format);
 	}
 	if (snd_pcm_format_linear(src_format)) {
 		lfloat->int32_idx = snd_pcm_linear_get_index(src_format, SND_PCM_FORMAT_S32);
 		lfloat->float32_idx = snd_pcm_lfloat_put_s32_index(dst_format);
 		lfloat->func = snd_pcm_lfloat_convert_integer_float;
 	} else {
 		lfloat->int32_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S32, dst_format);
 		lfloat->float32_idx = snd_pcm_lfloat_get_s32_index(src_format);
 		lfloat->func = snd_pcm_lfloat_convert_float_integer;
 	}
 	return 0;
 }

 static snd_pcm_uframes_t
 snd_pcm_lfloat_write_areas(snd_pcm_t *pcm,
 			   const snd_pcm_channel_area_t *areas,
 			   snd_pcm_uframes_t offset,
 			   snd_pcm_uframes_t size,
 			   const snd_pcm_channel_area_t *slave_areas,
 			   snd_pcm_uframes_t slave_offset,
 			   snd_pcm_uframes_t *slave_sizep)
 {
 	snd_pcm_lfloat_t *lfloat = pcm->private_data;
 	if (size > *slave_sizep)
 		size = *slave_sizep;
 	lfloat->func(slave_areas, slave_offset,
 		     areas, offset,
 		     pcm->channels, size,
 		     lfloat->int32_idx, lfloat->float32_idx);
 	*slave_sizep = size;
 	return size;
 }

 static snd_pcm_uframes_t
 snd_pcm_lfloat_read_areas(snd_pcm_t *pcm,
 			  const snd_pcm_channel_area_t *areas,
 			  snd_pcm_uframes_t offset,
 			  snd_pcm_uframes_t size,
 			  const snd_pcm_channel_area_t *slave_areas,
 			  snd_pcm_uframes_t slave_offset,
 			  snd_pcm_uframes_t *slave_sizep)
 {
 	snd_pcm_lfloat_t *lfloat = pcm->private_data;
 	if (size > *slave_sizep)
 		size = *slave_sizep;
 	lfloat->func(areas, offset,
 		     slave_areas, slave_offset,
 		     pcm->channels, size,
 		     lfloat->int32_idx, lfloat->float32_idx);
 	*slave_sizep = size;
 	return size;
 }

 static void snd_pcm_lfloat_dump(snd_pcm_t *pcm, snd_output_t *out)
 {
 	snd_pcm_lfloat_t *lfloat = pcm->private_data;
 	snd_output_printf(out, "Linear Integer <-> Linear Float conversion PCM (%s)\n",
 		snd_pcm_format_name(lfloat->sformat));
 	if (pcm->setup) {
 		snd_output_printf(out, "Its setup is:\n");
 		snd_pcm_dump_setup(pcm, out);
 	}
 	snd_output_printf(out, "Slave: ");
 	snd_pcm_dump(lfloat->plug.gen.slave, out);
 }

 static const snd_pcm_ops_t snd_pcm_lfloat_ops = {
 	.close = snd_pcm_generic_close,
 	.info = snd_pcm_generic_info,
 	.hw_refine = snd_pcm_lfloat_hw_refine,
 	.hw_params = snd_pcm_lfloat_hw_params,
 	.hw_free = snd_pcm_generic_hw_free,
 	.sw_params = snd_pcm_generic_sw_params,
 	.channel_info = snd_pcm_generic_channel_info,
 	.dump = snd_pcm_lfloat_dump,
 	.nonblock = snd_pcm_generic_nonblock,
 	.async = snd_pcm_generic_async,
 	.mmap = snd_pcm_generic_mmap,
 	.munmap = snd_pcm_generic_munmap,
 	.query_chmaps = snd_pcm_generic_query_chmaps,
 	.get_chmap = snd_pcm_generic_get_chmap,
 	.set_chmap = snd_pcm_generic_set_chmap,
 };

 /**
  * \brief Creates a new linear conversion PCM
  * \param pcmp Returns created PCM handle
  * \param name Name of PCM
  * \param sformat Slave (destination) format
  * \param slave Slave PCM handle
  * \param close_slave When set, the slave PCM handle is closed with copy PCM
  * \retval zero on success otherwise a negative error code
  * \warning Using of this function might be dangerous in the sense
  *          of compatibility reasons. The prototype might be freely
  *          changed in future.
  */
 int snd_pcm_lfloat_open(snd_pcm_t **pcmp, const char *name, snd_pcm_format_t sformat, snd_pcm_t *slave, int close_slave)
 {
 	snd_pcm_t *pcm;
 	snd_pcm_lfloat_t *lfloat;
 	int err;
 	assert(pcmp && slave);
 	if (snd_pcm_format_linear(sformat) != 1 &&
 	    snd_pcm_format_float(sformat) != 1)
 		return -EINVAL;
 	lfloat = calloc(1, sizeof(snd_pcm_lfloat_t));
 	if (!lfloat) {
 		return -ENOMEM;
 	}
 	snd_pcm_plugin_init(&lfloat->plug);
 	lfloat->sformat = sformat;
 	lfloat->plug.read = snd_pcm_lfloat_read_areas;
 	lfloat->plug.write = snd_pcm_lfloat_write_areas;
 	lfloat->plug.undo_read = snd_pcm_plugin_undo_read_generic;
 	lfloat->plug.undo_write = snd_pcm_plugin_undo_write_generic;
 	lfloat->plug.gen.slave = slave;
 	lfloat->plug.gen.close_slave = close_slave;

 	err = snd_pcm_new(&pcm, SND_PCM_TYPE_LINEAR_FLOAT, name, slave->stream, slave->mode);
 	if (err < 0) {
 		free(lfloat);
 		return err;
 	}
 	pcm->ops = &snd_pcm_lfloat_ops;
 	pcm->fast_ops = &snd_pcm_plugin_fast_ops;
 	pcm->private_data = lfloat;
 	pcm->poll_fd = slave->poll_fd;
 	pcm->poll_events = slave->poll_events;
 	pcm->tstamp_type = slave->tstamp_type;
 	snd_pcm_set_hw_ptr(pcm, &lfloat->plug.hw_ptr, -1, 0);
 	snd_pcm_set_appl_ptr(pcm, &lfloat->plug.appl_ptr, -1, 0);
 	*pcmp = pcm;

 	return 0;
 }

 /*! \page pcm_plugins

 \section pcm_plugins_lfloat Plugin: linear<->float

 This plugin converts linear to float samples and float to linear samples from master
 linear<->float conversion PCM to given slave PCM. The channel count, format and rate must
 match for both of them.

 \code
 pcm.name {
         type lfloat             # Linear<->Float conversion PCM
         slave STR               # Slave name
         # or
         slave {                 # Slave definition
                 pcm STR         # Slave PCM name
                 # or
                 pcm { }         # Slave PCM definition
                 format STR      # Slave format
         }
 }
 \endcode

 \subsection pcm_plugins_lfloat_funcref Function reference

 <UL>
   <LI>snd_pcm_lfloat_open()
   <LI>_snd_pcm_lfloat_open()
 </UL>

 */

 /**
  * \brief Creates a new linear<->float conversion PCM
  * \param pcmp Returns created PCM handle
  * \param name Name of PCM
  * \param root Root configuration node
  * \param conf Configuration node with copy PCM description
  * \param stream Stream type
  * \param mode Stream mode
  * \retval zero on success otherwise a negative error code
  * \warning Using of this function might be dangerous in the sense
  *          of compatibility reasons. The prototype might be freely
  *          changed in future.
  */
 int _snd_pcm_lfloat_open(snd_pcm_t **pcmp, const char *name,
 			 snd_config_t *root, snd_config_t *conf,
 			 snd_pcm_stream_t stream, int mode)
 {
 	snd_config_iterator_t i, next;
 	int err;
 	snd_pcm_t *spcm;
 	snd_config_t *slave = NULL, *sconf;
 	snd_pcm_format_t sformat;
 	snd_config_for_each(i, next, conf) {
 		snd_config_t *n = snd_config_iterator_entry(i);
 		const char *id;
 		if (snd_config_get_id(n, &id) < 0)
 			continue;
 		if (snd_pcm_conf_generic_id(id))
 			continue;
 		if (strcmp(id, "slave") == 0) {
 			slave = n;
 			continue;
 		}
 		SNDERR("Unknown field %s", id);
 		return -EINVAL;
 	}
 	if (!slave) {
 		SNDERR("slave is not defined");
 		return -EINVAL;
 	}
 	err = snd_pcm_slave_conf(root, slave, &sconf, 1,
 				 SND_PCM_HW_PARAM_FORMAT, SCONF_MANDATORY, &sformat);
 	if (err < 0)
 		return err;
 	if (snd_pcm_format_linear(sformat) != 1 &&
 	    snd_pcm_format_float(sformat) != 1) {
 		snd_config_delete(sconf);
 		SNDERR("slave format is not linear integer or linear float");
 		return -EINVAL;
 	}
 	err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode, conf);
 	snd_config_delete(sconf);
 	if (err < 0)
 		return err;
 	err = snd_pcm_lfloat_open(pcmp, name, sformat, spcm, 1);
 	if (err < 0)
 		snd_pcm_close(spcm);
 	return err;
 }
 #ifndef DOC_HIDDEN
 SND_DLSYM_BUILD_VERSION(_snd_pcm_lfloat_open, SND_PCM_DLSYM_VERSION);
 #endif

 #else /* BUGGY_GCC */

 int snd_pcm_lfloat_open(snd_pcm_t **pcmp ATTRIBUTE_UNUSED,
 			const char *name ATTRIBUTE_UNUSED,
 			snd_pcm_format_t sformat ATTRIBUTE_UNUSED,
 			snd_pcm_t *slave ATTRIBUTE_UNUSED,
 			int close_slave ATTRIBUTE_UNUSED)
 {
 	SNDERR("please, upgrade your GCC to use lfloat plugin");
 	return -EINVAL;
 }

 int _snd_pcm_lfloat_open(snd_pcm_t **pcmp ATTRIBUTE_UNUSED,
 			 const char *name ATTRIBUTE_UNUSED,
 			 snd_config_t *root ATTRIBUTE_UNUSED,
 			 snd_config_t *conf ATTRIBUTE_UNUSED,
 			 snd_pcm_stream_t stream ATTRIBUTE_UNUSED,
 			 int mode ATTRIBUTE_UNUSED)
 {
 	SNDERR("please, upgrade your GCC to use lfloat plugin");
 	return -EINVAL;
 }

 #endif /* BUGGY_GCC */
	/**
	* \file pcm/pcm_lfloat.c
	* \ingroup PCM_Plugins
	* \brief PCM Linear<->Float Conversion Plugin Interface
	* \author Jaroslav Kysela <perex@perex.cz>
	* \date 2001
	*/
	/*
	* PCM - Linear Integer <-> Linear Float conversion
	* Copyright (c) 2001 by Jaroslav Kysela <perex@perex.cz>
	*
	*
	* This library is free software; you can redistribute it and/or modify
	* it under the terms of the GNU Lesser General Public License as
	* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser 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 <byteswap.h>
	#include "pcm_local.h"
	#include "pcm_plugin.h"

	#include "plugin_ops.h"

	#ifndef DOC_HIDDEN

	typedef float float_t;
	typedef double double_t;

	#if __GNUC__ < 2 \|\| (__GNUC__ == 2 && __GNUC_MINOR__ <= 91)
	#define BUGGY_GCC
	#endif

	#ifndef PIC
	/* entry for static linking */
	const char *_snd_module_pcm_lfloat = "";
	#endif

	typedef struct {
	/* This field need to be the first */
	snd_pcm_plugin_t plug;
	unsigned int int32_idx;
	unsigned int float32_idx;
	snd_pcm_format_t sformat;
	void (func)(const snd_pcm_channel_area_t dst_areas, snd_pcm_uframes_t dst_offset,
	const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
	unsigned int channels, snd_pcm_uframes_t frames,
	unsigned int get32idx, unsigned int put32floatidx);
	} snd_pcm_lfloat_t;

	int snd_pcm_lfloat_get_s32_index(snd_pcm_format_t format)
	{
	int width, endian;

	switch (format) {
	case SND_PCM_FORMAT_FLOAT_LE:
	case SND_PCM_FORMAT_FLOAT_BE:
	width = 32;
	break;
	case SND_PCM_FORMAT_FLOAT64_LE:
	case SND_PCM_FORMAT_FLOAT64_BE:
	width = 64;
	break;
	default:
	return -EINVAL;
	}
	#ifdef SND_LITTLE_ENDIAN
	endian = snd_pcm_format_big_endian(format);
	#else
	endian = snd_pcm_format_little_endian(format);
	#endif
	return ((width / 32)-1) * 2 + endian;
	}

	int snd_pcm_lfloat_put_s32_index(snd_pcm_format_t format)
	{
	return snd_pcm_lfloat_get_s32_index(format);
	}

	#endif /* DOC_HIDDEN */

	#ifndef BUGGY_GCC

	#ifndef DOC_HIDDEN

	void snd_pcm_lfloat_convert_integer_float(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
	const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
	unsigned int channels, snd_pcm_uframes_t frames,
	unsigned int get32idx, unsigned int put32floatidx)
	{
	#define GET32_LABELS
	#define PUT32F_LABELS
	#include "plugin_ops.h"
	#undef PUT32F_LABELS
	#undef GET32_LABELS
	void *get32 = get32_labels[get32idx];
	void *put32float = put32float_labels[put32floatidx];
	unsigned int channel;
	for (channel = 0; channel < channels; ++channel) {
	const char *src;
	char *dst;
	int src_step, dst_step;
	snd_pcm_uframes_t frames1;
	int32_t sample = 0;
	snd_tmp_float_t tmp_float;
	snd_tmp_double_t tmp_double;
	const snd_pcm_channel_area_t *src_area = &src_areas[channel];
	const snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
	src = snd_pcm_channel_area_addr(src_area, src_offset);
	dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
	src_step = snd_pcm_channel_area_step(src_area);
	dst_step = snd_pcm_channel_area_step(dst_area);
	frames1 = frames;
	while (frames1-- > 0) {
	goto *get32;
	#define GET32_END sample_loaded
	#include "plugin_ops.h"
	#undef GET32_END
	sample_loaded:
	goto *put32float;
	#define PUT32F_END sample_put
	#include "plugin_ops.h"
	#undef PUT32F_END
	sample_put:
	src += src_step;
	dst += dst_step;
	}
	}
	}

	void snd_pcm_lfloat_convert_float_integer(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
	const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
	unsigned int channels, snd_pcm_uframes_t frames,
	unsigned int put32idx, unsigned int get32floatidx)
	{
	#define PUT32_LABELS
	#define GET32F_LABELS
	#include "plugin_ops.h"
	#undef GET32F_LABELS
	#undef PUT32_LABELS
	void *put32 = put32_labels[put32idx];
	void *get32float = get32float_labels[get32floatidx];
	unsigned int channel;
	for (channel = 0; channel < channels; ++channel) {
	const char *src;
	char *dst;
	int src_step, dst_step;
	snd_pcm_uframes_t frames1;
	int32_t sample = 0;
	snd_tmp_float_t tmp_float;
	snd_tmp_double_t tmp_double;
	const snd_pcm_channel_area_t *src_area = &src_areas[channel];
	const snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
	src = snd_pcm_channel_area_addr(src_area, src_offset);
	dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
	src_step = snd_pcm_channel_area_step(src_area);
	dst_step = snd_pcm_channel_area_step(dst_area);
	frames1 = frames;
	while (frames1-- > 0) {
	goto *get32float;
	#define GET32F_END sample_loaded
	#include "plugin_ops.h"
	#undef GET32F_END
	sample_loaded:
	goto *put32;
	#define PUT32_END sample_put
	#include "plugin_ops.h"
	#undef PUT32_END
	sample_put:
	src += src_step;
	dst += dst_step;
	}
	}
	}

	#endif /* DOC_HIDDEN */

	static int snd_pcm_lfloat_hw_refine_cprepare(snd_pcm_t pcm, snd_pcm_hw_params_t params)
	{
	snd_pcm_lfloat_t *lfloat = pcm->private_data;
	int err;
	snd_pcm_access_mask_t access_mask = { SND_PCM_ACCBIT_SHM };
	snd_pcm_format_mask_t lformat_mask = { SND_PCM_FMTBIT_LINEAR };
	snd_pcm_format_mask_t fformat_mask = { SND_PCM_FMTBIT_FLOAT };
	err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_ACCESS,
	&access_mask);
	if (err < 0)
	return err;
	err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_FORMAT,
	snd_pcm_format_linear(lfloat->sformat) ?
	&fformat_mask : &lformat_mask);
	if (err < 0)
	return err;
	err = _snd_pcm_hw_params_set_subformat(params, SND_PCM_SUBFORMAT_STD);
	if (err < 0)
	return err;
	params->info &= ~(SND_PCM_INFO_MMAP \| SND_PCM_INFO_MMAP_VALID);
	return 0;
	}

	static int snd_pcm_lfloat_hw_refine_sprepare(snd_pcm_t pcm, snd_pcm_hw_params_t sparams)
	{
	snd_pcm_lfloat_t *lfloat = pcm->private_data;
	snd_pcm_access_mask_t saccess_mask = { SND_PCM_ACCBIT_MMAP };
	_snd_pcm_hw_params_any(sparams);
	_snd_pcm_hw_param_set_mask(sparams, SND_PCM_HW_PARAM_ACCESS,
	&saccess_mask);
	_snd_pcm_hw_params_set_format(sparams, lfloat->sformat);
	_snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
	return 0;
	}

	static int snd_pcm_lfloat_hw_refine_schange(snd_pcm_t pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t params,
	snd_pcm_hw_params_t *sparams)
	{
	int err;
	unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS \|
	SND_PCM_HW_PARBIT_RATE \|
	SND_PCM_HW_PARBIT_PERIOD_SIZE \|
	SND_PCM_HW_PARBIT_BUFFER_SIZE \|
	SND_PCM_HW_PARBIT_PERIODS \|
	SND_PCM_HW_PARBIT_PERIOD_TIME \|
	SND_PCM_HW_PARBIT_BUFFER_TIME \|
	SND_PCM_HW_PARBIT_TICK_TIME);
	err = _snd_pcm_hw_params_refine(sparams, links, params);
	if (err < 0)
	return err;
	return 0;
	}

	static int snd_pcm_lfloat_hw_refine_cchange(snd_pcm_t pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t params,
	snd_pcm_hw_params_t *sparams)
	{
	int err;
	unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS \|
	SND_PCM_HW_PARBIT_RATE \|
	SND_PCM_HW_PARBIT_PERIOD_SIZE \|
	SND_PCM_HW_PARBIT_BUFFER_SIZE \|
	SND_PCM_HW_PARBIT_PERIODS \|
	SND_PCM_HW_PARBIT_PERIOD_TIME \|
	SND_PCM_HW_PARBIT_BUFFER_TIME \|
	SND_PCM_HW_PARBIT_TICK_TIME);
	err = _snd_pcm_hw_params_refine(params, links, sparams);
	if (err < 0)
	return err;
	return 0;
	}

	static int snd_pcm_lfloat_hw_refine(snd_pcm_t pcm, snd_pcm_hw_params_t params)
	{
	return snd_pcm_hw_refine_slave(pcm, params,
	snd_pcm_lfloat_hw_refine_cprepare,
	snd_pcm_lfloat_hw_refine_cchange,
	snd_pcm_lfloat_hw_refine_sprepare,
	snd_pcm_lfloat_hw_refine_schange,
	snd_pcm_generic_hw_refine);
	}

	static int snd_pcm_lfloat_hw_params(snd_pcm_t pcm, snd_pcm_hw_params_t params)
	{
	snd_pcm_lfloat_t *lfloat = pcm->private_data;
	snd_pcm_t *slave = lfloat->plug.gen.slave;
	snd_pcm_format_t src_format, dst_format;
	int err = snd_pcm_hw_params_slave(pcm, params,
	snd_pcm_lfloat_hw_refine_cchange,
	snd_pcm_lfloat_hw_refine_sprepare,
	snd_pcm_lfloat_hw_refine_schange,
	snd_pcm_generic_hw_params);
	if (err < 0)
	return err;
	if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
	err = INTERNAL(snd_pcm_hw_params_get_format)(params, &src_format);
	dst_format = slave->format;
	} else {
	src_format = slave->format;
	err = INTERNAL(snd_pcm_hw_params_get_format)(params, &dst_format);
	}
	if (snd_pcm_format_linear(src_format)) {
	lfloat->int32_idx = snd_pcm_linear_get_index(src_format, SND_PCM_FORMAT_S32);
	lfloat->float32_idx = snd_pcm_lfloat_put_s32_index(dst_format);
	lfloat->func = snd_pcm_lfloat_convert_integer_float;
	} else {
	lfloat->int32_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S32, dst_format);
	lfloat->float32_idx = snd_pcm_lfloat_get_s32_index(src_format);
	lfloat->func = snd_pcm_lfloat_convert_float_integer;
	}
	return 0;
	}

	static snd_pcm_uframes_t
	snd_pcm_lfloat_write_areas(snd_pcm_t *pcm,
	const snd_pcm_channel_area_t *areas,
	snd_pcm_uframes_t offset,
	snd_pcm_uframes_t size,
	const snd_pcm_channel_area_t *slave_areas,
	snd_pcm_uframes_t slave_offset,
	snd_pcm_uframes_t *slave_sizep)
	{
	snd_pcm_lfloat_t *lfloat = pcm->private_data;
	if (size > *slave_sizep)
	size = *slave_sizep;
	lfloat->func(slave_areas, slave_offset,
	areas, offset,
	pcm->channels, size,
	lfloat->int32_idx, lfloat->float32_idx);
	*slave_sizep = size;
	return size;
	}

	static snd_pcm_uframes_t
	snd_pcm_lfloat_read_areas(snd_pcm_t *pcm,
	const snd_pcm_channel_area_t *areas,
	snd_pcm_uframes_t offset,
	snd_pcm_uframes_t size,
	const snd_pcm_channel_area_t *slave_areas,
	snd_pcm_uframes_t slave_offset,
	snd_pcm_uframes_t *slave_sizep)
	{
	snd_pcm_lfloat_t *lfloat = pcm->private_data;
	if (size > *slave_sizep)
	size = *slave_sizep;
	lfloat->func(areas, offset,
	slave_areas, slave_offset,
	pcm->channels, size,
	lfloat->int32_idx, lfloat->float32_idx);
	*slave_sizep = size;
	return size;
	}

	static void snd_pcm_lfloat_dump(snd_pcm_t pcm, snd_output_t out)
	{
	snd_pcm_lfloat_t *lfloat = pcm->private_data;
	snd_output_printf(out, "Linear Integer <-> Linear Float conversion PCM (%s)\n",
	snd_pcm_format_name(lfloat->sformat));
	if (pcm->setup) {
	snd_output_printf(out, "Its setup is:\n");
	snd_pcm_dump_setup(pcm, out);
	}
	snd_output_printf(out, "Slave: ");
	snd_pcm_dump(lfloat->plug.gen.slave, out);
	}

	static const snd_pcm_ops_t snd_pcm_lfloat_ops = {
	.close = snd_pcm_generic_close,
	.info = snd_pcm_generic_info,
	.hw_refine = snd_pcm_lfloat_hw_refine,
	.hw_params = snd_pcm_lfloat_hw_params,
	.hw_free = snd_pcm_generic_hw_free,
	.sw_params = snd_pcm_generic_sw_params,
	.channel_info = snd_pcm_generic_channel_info,
	.dump = snd_pcm_lfloat_dump,
	.nonblock = snd_pcm_generic_nonblock,
	.async = snd_pcm_generic_async,
	.mmap = snd_pcm_generic_mmap,
	.munmap = snd_pcm_generic_munmap,
	.query_chmaps = snd_pcm_generic_query_chmaps,
	.get_chmap = snd_pcm_generic_get_chmap,
	.set_chmap = snd_pcm_generic_set_chmap,
	};

	/**
	* \brief Creates a new linear conversion PCM
	* \param pcmp Returns created PCM handle
	* \param name Name of PCM
	* \param sformat Slave (destination) format
	* \param slave Slave PCM handle
	* \param close_slave When set, the slave PCM handle is closed with copy PCM
	* \retval zero on success otherwise a negative error code
	* \warning Using of this function might be dangerous in the sense
	* of compatibility reasons. The prototype might be freely
	* changed in future.
	*/
	int snd_pcm_lfloat_open(snd_pcm_t *pcmp, const char name, snd_pcm_format_t sformat, snd_pcm_t *slave, int close_slave)
	{
	snd_pcm_t *pcm;
	snd_pcm_lfloat_t *lfloat;
	int err;
	assert(pcmp && slave);
	if (snd_pcm_format_linear(sformat) != 1 &&
	snd_pcm_format_float(sformat) != 1)
	return -EINVAL;
	lfloat = calloc(1, sizeof(snd_pcm_lfloat_t));
	if (!lfloat) {
	return -ENOMEM;
	}
	snd_pcm_plugin_init(&lfloat->plug);
	lfloat->sformat = sformat;
	lfloat->plug.read = snd_pcm_lfloat_read_areas;
	lfloat->plug.write = snd_pcm_lfloat_write_areas;
	lfloat->plug.undo_read = snd_pcm_plugin_undo_read_generic;
	lfloat->plug.undo_write = snd_pcm_plugin_undo_write_generic;
	lfloat->plug.gen.slave = slave;
	lfloat->plug.gen.close_slave = close_slave;

	err = snd_pcm_new(&pcm, SND_PCM_TYPE_LINEAR_FLOAT, name, slave->stream, slave->mode);
	if (err < 0) {
	free(lfloat);
	return err;
	}
	pcm->ops = &snd_pcm_lfloat_ops;
	pcm->fast_ops = &snd_pcm_plugin_fast_ops;
	pcm->private_data = lfloat;
	pcm->poll_fd = slave->poll_fd;
	pcm->poll_events = slave->poll_events;
	pcm->tstamp_type = slave->tstamp_type;
	snd_pcm_set_hw_ptr(pcm, &lfloat->plug.hw_ptr, -1, 0);
	snd_pcm_set_appl_ptr(pcm, &lfloat->plug.appl_ptr, -1, 0);
	*pcmp = pcm;

	return 0;
	}

	/*! \page pcm_plugins

	\section pcm_plugins_lfloat Plugin: linear<->float

	This plugin converts linear to float samples and float to linear samples from master
	linear<->float conversion PCM to given slave PCM. The channel count, format and rate must
	match for both of them.

	\code
	pcm.name {
	type lfloat # Linear<->Float conversion PCM
	slave STR # Slave name
	# or
	slave { # Slave definition
	pcm STR # Slave PCM name
	# or
	pcm { } # Slave PCM definition
	format STR # Slave format
	}
	}
	\endcode

	\subsection pcm_plugins_lfloat_funcref Function reference

	<UL>
	<LI>snd_pcm_lfloat_open()
	<LI>_snd_pcm_lfloat_open()
	</UL>

	*/

	/**
	* \brief Creates a new linear<->float conversion PCM
	* \param pcmp Returns created PCM handle
	* \param name Name of PCM
	* \param root Root configuration node
	* \param conf Configuration node with copy PCM description
	* \param stream Stream type
	* \param mode Stream mode
	* \retval zero on success otherwise a negative error code
	* \warning Using of this function might be dangerous in the sense
	* of compatibility reasons. The prototype might be freely
	* changed in future.
	*/
	int _snd_pcm_lfloat_open(snd_pcm_t *pcmp, const char name,
	snd_config_t root, snd_config_t conf,
	snd_pcm_stream_t stream, int mode)
	{
	snd_config_iterator_t i, next;
	int err;
	snd_pcm_t *spcm;
	snd_config_t slave = NULL, sconf;
	snd_pcm_format_t sformat;
	snd_config_for_each(i, next, conf) {
	snd_config_t *n = snd_config_iterator_entry(i);
	const char *id;
	if (snd_config_get_id(n, &id) < 0)
	continue;
	if (snd_pcm_conf_generic_id(id))
	continue;
	if (strcmp(id, "slave") == 0) {
	slave = n;
	continue;
	}
	SNDERR("Unknown field %s", id);
	return -EINVAL;
	}
	if (!slave) {
	SNDERR("slave is not defined");
	return -EINVAL;
	}
	err = snd_pcm_slave_conf(root, slave, &sconf, 1,
	SND_PCM_HW_PARAM_FORMAT, SCONF_MANDATORY, &sformat);
	if (err < 0)
	return err;
	if (snd_pcm_format_linear(sformat) != 1 &&
	snd_pcm_format_float(sformat) != 1) {
	snd_config_delete(sconf);
	SNDERR("slave format is not linear integer or linear float");
	return -EINVAL;
	}
	err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode, conf);
	snd_config_delete(sconf);
	if (err < 0)
	return err;
	err = snd_pcm_lfloat_open(pcmp, name, sformat, spcm, 1);
	if (err < 0)
	snd_pcm_close(spcm);
	return err;
	}
	#ifndef DOC_HIDDEN
	SND_DLSYM_BUILD_VERSION(_snd_pcm_lfloat_open, SND_PCM_DLSYM_VERSION);
	#endif

	#else /* BUGGY_GCC */

	int snd_pcm_lfloat_open(snd_pcm_t **pcmp ATTRIBUTE_UNUSED,
	const char *name ATTRIBUTE_UNUSED,
	snd_pcm_format_t sformat ATTRIBUTE_UNUSED,
	snd_pcm_t *slave ATTRIBUTE_UNUSED,
	int close_slave ATTRIBUTE_UNUSED)
	{
	SNDERR("please, upgrade your GCC to use lfloat plugin");
	return -EINVAL;
	}

	int _snd_pcm_lfloat_open(snd_pcm_t **pcmp ATTRIBUTE_UNUSED,
	const char *name ATTRIBUTE_UNUSED,
	snd_config_t *root ATTRIBUTE_UNUSED,
	snd_config_t *conf ATTRIBUTE_UNUSED,
	snd_pcm_stream_t stream ATTRIBUTE_UNUSED,
	int mode ATTRIBUTE_UNUSED)
	{
	SNDERR("please, upgrade your GCC to use lfloat plugin");
	return -EINVAL;
	}

	#endif /* BUGGY_GCC */