/**
* \file pcm/pcm_linear.c
* \ingroup PCM_Plugins
* \brief PCM Linear Conversion Plugin Interface
* \author Abramo Bagnara <abramo@alsa-project.org>
* \date 2000-2001
*/
/*
* PCM - Linear conversion
* 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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "bswap.h"
#include "pcm_local.h"
#include "pcm_plugin.h"
#include "plugin_ops.h"
#ifndef PIC
/* entry for static linking */
const char *_snd_module_pcm_linear = "";
#endif
#ifndef DOC_HIDDEN
typedef struct {
/* This field need to be the first */
snd_pcm_plugin_t plug;
unsigned int use_getput;
unsigned int conv_idx;
unsigned int get_idx, put_idx;
snd_pcm_format_t sformat;
} snd_pcm_linear_t;
#endif
#ifndef DOC_HIDDEN
int snd_pcm_linear_convert_index(snd_pcm_format_t src_format,
snd_pcm_format_t dst_format)
{
int src_endian, dst_endian, sign, src_width, dst_width;
sign = (snd_pcm_format_signed(src_format) !=
snd_pcm_format_signed(dst_format));
#ifdef SND_LITTLE_ENDIAN
src_endian = snd_pcm_format_big_endian(src_format);
dst_endian = snd_pcm_format_big_endian(dst_format);
#else
src_endian = snd_pcm_format_little_endian(src_format);
dst_endian = snd_pcm_format_little_endian(dst_format);
#endif
if (src_endian < 0)
src_endian = 0;
if (dst_endian < 0)
dst_endian = 0;
src_width = snd_pcm_format_width(src_format) / 8 - 1;
dst_width = snd_pcm_format_width(dst_format) / 8 - 1;
return src_width * 32 + src_endian * 16 + sign * 8 + dst_width * 2 + dst_endian;
}
int snd_pcm_linear_get_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format)
{
int sign, width, pwidth, endian;
sign = (snd_pcm_format_signed(src_format) !=
snd_pcm_format_signed(dst_format));
#ifdef SND_LITTLE_ENDIAN
endian = snd_pcm_format_big_endian(src_format);
#else
endian = snd_pcm_format_little_endian(src_format);
#endif
if (endian < 0)
endian = 0;
pwidth = snd_pcm_format_physical_width(src_format);
width = snd_pcm_format_width(src_format);
if (pwidth == 24) {
switch (width) {
case 24:
width = 0; break;
case 20:
width = 1; break;
case 18:
default:
width = 2; break;
}
return width * 4 + endian * 2 + sign + 20;
} else {
if (width == 20)
width = 40;
width = width / 8 - 1;
return width * 4 + endian * 2 + sign;
}
}
int snd_pcm_linear_put_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format)
{
int sign, width, pwidth, endian;
sign = (snd_pcm_format_signed(src_format) !=
snd_pcm_format_signed(dst_format));
#ifdef SND_LITTLE_ENDIAN
endian = snd_pcm_format_big_endian(dst_format);
#else
endian = snd_pcm_format_little_endian(dst_format);
#endif
if (endian < 0)
endian = 0;
pwidth = snd_pcm_format_physical_width(dst_format);
width = snd_pcm_format_width(dst_format);
if (pwidth == 24) {
switch (width) {
case 24:
width = 0; break;
case 20:
width = 1; break;
case 18:
default:
width = 2; break;
}
return width * 4 + endian * 2 + sign + 20;
} else {
if (width == 20)
width = 40;
width = width / 8 - 1;
return width * 4 + endian * 2 + sign;
}
}
void snd_pcm_linear_convert(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 convidx)
{
#define CONV_LABELS
#include "plugin_ops.h"
#undef CONV_LABELS
void *conv = conv_labels[convidx];
unsigned int channel;
for (channel = 0; channel < channels; ++channel) {
const char *src;
char *dst;
int src_step, dst_step;
snd_pcm_uframes_t frames1;
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 *conv;
#define CONV_END after
#include "plugin_ops.h"
#undef CONV_END
after:
src += src_step;
dst += dst_step;
}
}
}
void snd_pcm_linear_getput(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 get_idx, unsigned int put_idx)
{
#define CONV24_LABELS
#include "plugin_ops.h"
#undef CONV24_LABELS
void *get = get32_labels[get_idx];
void *put = put32_labels[put_idx];
unsigned int channel;
uint32_t sample = 0;
for (channel = 0; channel < channels; ++channel) {
const char *src;
char *dst;
int src_step, dst_step;
snd_pcm_uframes_t frames1;
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 *get;
#define CONV24_END after
#include "plugin_ops.h"
#undef CONV24_END
after:
src += src_step;
dst += dst_step;
}
}
}
#endif /* DOC_HIDDEN */
static int snd_pcm_linear_hw_refine_cprepare(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params)
{
int err;
snd_pcm_access_mask_t access_mask = { SND_PCM_ACCBIT_SHM };
snd_pcm_format_mask_t format_mask = { SND_PCM_FMTBIT_LINEAR };
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,
&format_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_linear_hw_refine_sprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *sparams)
{
snd_pcm_linear_t *linear = 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, linear->sformat);
_snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
return 0;
}
static int snd_pcm_linear_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_linear_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_linear_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
return snd_pcm_hw_refine_slave(pcm, params,
snd_pcm_linear_hw_refine_cprepare,
snd_pcm_linear_hw_refine_cchange,
snd_pcm_linear_hw_refine_sprepare,
snd_pcm_linear_hw_refine_schange,
snd_pcm_generic_hw_refine);
}
static int snd_pcm_linear_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
snd_pcm_linear_t *linear = pcm->private_data;
snd_pcm_format_t format;
int err = snd_pcm_hw_params_slave(pcm, params,
snd_pcm_linear_hw_refine_cchange,
snd_pcm_linear_hw_refine_sprepare,
snd_pcm_linear_hw_refine_schange,
snd_pcm_generic_hw_params);
if (err < 0)
return err;
err = INTERNAL(snd_pcm_hw_params_get_format)(params, &format);
if (err < 0)
return err;
linear->use_getput = (snd_pcm_format_physical_width(format) == 24 ||
snd_pcm_format_physical_width(linear->sformat) == 24 ||
snd_pcm_format_width(format) == 20 ||
snd_pcm_format_width(linear->sformat) == 20);
if (linear->use_getput) {
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
linear->get_idx = snd_pcm_linear_get_index(format, SND_PCM_FORMAT_S32);
linear->put_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S32, linear->sformat);
} else {
linear->get_idx = snd_pcm_linear_get_index(linear->sformat, SND_PCM_FORMAT_S32);
linear->put_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S32, format);
}
} else {
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
linear->conv_idx = snd_pcm_linear_convert_index(format,
linear->sformat);
else
linear->conv_idx = snd_pcm_linear_convert_index(linear->sformat,
format);
}
return 0;
}
static snd_pcm_uframes_t
snd_pcm_linear_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_linear_t *linear = pcm->private_data;
if (size > *slave_sizep)
size = *slave_sizep;
if (linear->use_getput)
snd_pcm_linear_getput(slave_areas, slave_offset,
areas, offset,
pcm->channels, size,
linear->get_idx, linear->put_idx);
else
snd_pcm_linear_convert(slave_areas, slave_offset,
areas, offset,
pcm->channels, size, linear->conv_idx);
*slave_sizep = size;
return size;
}
static snd_pcm_uframes_t
snd_pcm_linear_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_linear_t *linear = pcm->private_data;
if (size > *slave_sizep)
size = *slave_sizep;
if (linear->use_getput)
snd_pcm_linear_getput(areas, offset,
slave_areas, slave_offset,
pcm->channels, size,
linear->get_idx, linear->put_idx);
else
snd_pcm_linear_convert(areas, offset,
slave_areas, slave_offset,
pcm->channels, size, linear->conv_idx);
*slave_sizep = size;
return size;
}
static void snd_pcm_linear_dump(snd_pcm_t *pcm, snd_output_t *out)
{
snd_pcm_linear_t *linear = pcm->private_data;
snd_output_printf(out, "Linear conversion PCM (%s)\n",
snd_pcm_format_name(linear->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(linear->plug.gen.slave, out);
}
static const snd_pcm_ops_t snd_pcm_linear_ops = {
.close = snd_pcm_generic_close,
.info = snd_pcm_generic_info,
.hw_refine = snd_pcm_linear_hw_refine,
.hw_params = snd_pcm_linear_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_linear_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_linear_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_linear_t *linear;
int err;
assert(pcmp && slave);
if (snd_pcm_format_linear(sformat) != 1)
return -EINVAL;
linear = calloc(1, sizeof(snd_pcm_linear_t));
if (!linear) {
return -ENOMEM;
}
snd_pcm_plugin_init(&linear->plug);
linear->sformat = sformat;
linear->plug.read = snd_pcm_linear_read_areas;
linear->plug.write = snd_pcm_linear_write_areas;
linear->plug.undo_read = snd_pcm_plugin_undo_read_generic;
linear->plug.undo_write = snd_pcm_plugin_undo_write_generic;
linear->plug.gen.slave = slave;
linear->plug.gen.close_slave = close_slave;
err = snd_pcm_new(&pcm, SND_PCM_TYPE_LINEAR, name, slave->stream, slave->mode);
if (err < 0) {
free(linear);
return err;
}
pcm->ops = &snd_pcm_linear_ops;
pcm->fast_ops = &snd_pcm_plugin_fast_ops;
pcm->private_data = linear;
pcm->poll_fd = slave->poll_fd;
pcm->poll_events = slave->poll_events;
pcm->tstamp_type = slave->tstamp_type;
snd_pcm_set_hw_ptr(pcm, &linear->plug.hw_ptr, -1, 0);
snd_pcm_set_appl_ptr(pcm, &linear->plug.appl_ptr, -1, 0);
*pcmp = pcm;
return 0;
}
/*! \page pcm_plugins
\section pcm_plugins_linear Plugin: linear
This plugin converts linear samples from master linear conversion PCM to given
slave PCM. The channel count, format and rate must match for both of them.
\code
pcm.name {
type linear # Linear 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_linear_funcref Function reference
<UL>
<LI>snd_pcm_linear_open()
<LI>_snd_pcm_linear_open()
</UL>
*/
/**
* \brief Creates a new linear 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_linear_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_config_delete(sconf);
SNDERR("slave format is not linear");
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_linear_open(pcmp, name, sformat, spcm, 1);
if (err < 0)
snd_pcm_close(spcm);
return err;
}
#ifndef DOC_HIDDEN
SND_DLSYM_BUILD_VERSION(_snd_pcm_linear_open, SND_PCM_DLSYM_VERSION);
#endif