/*
* \file pcm/pcm_plug.c
* \ingroup PCM_Plugins
* \brief PCM Route & Volume Plugin Interface
* \author Abramo Bagnara <abramo@alsa-project.org>
* \date 2000-2001
*/
/*
* PCM - Plug
* 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 "pcm_local.h"
#include "pcm_plugin.h"
#ifndef PIC
/* entry for static linking */
const char *_snd_module_pcm_plug = "";
#endif
#ifndef DOC_HIDDEN
enum snd_pcm_plug_route_policy {
PLUG_ROUTE_POLICY_NONE,
PLUG_ROUTE_POLICY_DEFAULT,
PLUG_ROUTE_POLICY_COPY,
PLUG_ROUTE_POLICY_AVERAGE,
PLUG_ROUTE_POLICY_DUP,
};
typedef struct {
snd_pcm_generic_t gen;
snd_pcm_t *req_slave;
snd_pcm_format_t sformat;
int schannels;
int srate;
snd_config_t *rate_converter;
enum snd_pcm_plug_route_policy route_policy;
snd_pcm_route_ttable_entry_t *ttable;
int ttable_ok;
unsigned int tt_ssize, tt_cused, tt_sused;
} snd_pcm_plug_t;
#endif
static int snd_pcm_plug_close(snd_pcm_t *pcm)
{
snd_pcm_plug_t *plug = pcm->private_data;
int err, result = 0;
free(plug->ttable);
if (plug->rate_converter) {
snd_config_delete(plug->rate_converter);
plug->rate_converter = NULL;
}
assert(plug->gen.slave == plug->req_slave);
if (plug->gen.close_slave) {
snd_pcm_unlink_hw_ptr(pcm, plug->req_slave);
snd_pcm_unlink_appl_ptr(pcm, plug->req_slave);
err = snd_pcm_close(plug->req_slave);
if (err < 0)
result = err;
}
free(plug);
return result;
}
static int snd_pcm_plug_info(snd_pcm_t *pcm, snd_pcm_info_t *info)
{
snd_pcm_plug_t *plug = pcm->private_data;
snd_pcm_t *slave = plug->req_slave;
int err;
if ((err = snd_pcm_info(slave, info)) < 0)
return err;
return 0;
}
static const snd_pcm_format_t linear_preferred_formats[] = {
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S16_LE,
SND_PCM_FORMAT_U16_LE,
SND_PCM_FORMAT_S16_BE,
SND_PCM_FORMAT_U16_BE,
#else
SND_PCM_FORMAT_S16_BE,
SND_PCM_FORMAT_U16_BE,
SND_PCM_FORMAT_S16_LE,
SND_PCM_FORMAT_U16_LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S32_LE,
SND_PCM_FORMAT_U32_LE,
SND_PCM_FORMAT_S32_BE,
SND_PCM_FORMAT_U32_BE,
#else
SND_PCM_FORMAT_S32_BE,
SND_PCM_FORMAT_U32_BE,
SND_PCM_FORMAT_S32_LE,
SND_PCM_FORMAT_U32_LE,
#endif
SND_PCM_FORMAT_S8,
SND_PCM_FORMAT_U8,
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_FLOAT_LE,
SND_PCM_FORMAT_FLOAT64_LE,
SND_PCM_FORMAT_FLOAT_BE,
SND_PCM_FORMAT_FLOAT64_BE,
#else
SND_PCM_FORMAT_FLOAT_BE,
SND_PCM_FORMAT_FLOAT64_BE,
SND_PCM_FORMAT_FLOAT_LE,
SND_PCM_FORMAT_FLOAT64_LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S24_LE,
SND_PCM_FORMAT_U24_LE,
SND_PCM_FORMAT_S24_BE,
SND_PCM_FORMAT_U24_BE,
#else
SND_PCM_FORMAT_S24_BE,
SND_PCM_FORMAT_U24_BE,
SND_PCM_FORMAT_S24_LE,
SND_PCM_FORMAT_U24_LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S20_LE,
SND_PCM_FORMAT_U20_LE,
SND_PCM_FORMAT_S20_BE,
SND_PCM_FORMAT_U20_BE,
#else
SND_PCM_FORMAT_S20_BE,
SND_PCM_FORMAT_U20_BE,
SND_PCM_FORMAT_S20_LE,
SND_PCM_FORMAT_U20_LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S24_3LE,
SND_PCM_FORMAT_U24_3LE,
SND_PCM_FORMAT_S24_3BE,
SND_PCM_FORMAT_U24_3BE,
#else
SND_PCM_FORMAT_S24_3BE,
SND_PCM_FORMAT_U24_3BE,
SND_PCM_FORMAT_S24_3LE,
SND_PCM_FORMAT_U24_3LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S20_3LE,
SND_PCM_FORMAT_U20_3LE,
SND_PCM_FORMAT_S20_3BE,
SND_PCM_FORMAT_U20_3BE,
#else
SND_PCM_FORMAT_S20_3BE,
SND_PCM_FORMAT_U20_3BE,
SND_PCM_FORMAT_S20_3LE,
SND_PCM_FORMAT_U20_3LE,
#endif
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_S18_3LE,
SND_PCM_FORMAT_U18_3LE,
SND_PCM_FORMAT_S18_3BE,
SND_PCM_FORMAT_U18_3BE,
#else
SND_PCM_FORMAT_S18_3BE,
SND_PCM_FORMAT_U18_3BE,
SND_PCM_FORMAT_S18_3LE,
SND_PCM_FORMAT_U18_3LE,
#endif
};
#if defined(BUILD_PCM_PLUGIN_MULAW) || \
defined(BUILD_PCM_PLUGIN_ALAW) || \
defined(BUILD_PCM_PLUGIN_ADPCM)
#define BUILD_PCM_NONLINEAR
#endif
#ifdef BUILD_PCM_NONLINEAR
static const snd_pcm_format_t nonlinear_preferred_formats[] = {
#ifdef BUILD_PCM_PLUGIN_MULAW
SND_PCM_FORMAT_MU_LAW,
#endif
#ifdef BUILD_PCM_PLUGIN_ALAW
SND_PCM_FORMAT_A_LAW,
#endif
#ifdef BUILD_PCM_PLUGIN_ADPCM
SND_PCM_FORMAT_IMA_ADPCM,
#endif
};
#endif
#ifdef BUILD_PCM_PLUGIN_LFLOAT
static const snd_pcm_format_t float_preferred_formats[] = {
#ifdef SND_LITTLE_ENDIAN
SND_PCM_FORMAT_FLOAT_LE,
SND_PCM_FORMAT_FLOAT64_LE,
SND_PCM_FORMAT_FLOAT_BE,
SND_PCM_FORMAT_FLOAT64_BE,
#else
SND_PCM_FORMAT_FLOAT_BE,
SND_PCM_FORMAT_FLOAT64_BE,
SND_PCM_FORMAT_FLOAT_LE,
SND_PCM_FORMAT_FLOAT64_LE,
#endif
};
#endif
static const char linear_format_widths[32] = {
0, 0, 0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 1,
0, 1, 0, 1, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 1,
};
static int check_linear_format(const snd_pcm_format_mask_t *format_mask, int wid, int sgn, int ed)
{
int e, s;
if (! linear_format_widths[wid - 1])
return SND_PCM_FORMAT_UNKNOWN;
for (e = 0; e < 2; e++) {
for (s = 0; s < 2; s++) {
int pw = ((wid + 7) / 8) * 8;
for (; pw <= 32; pw += 8) {
snd_pcm_format_t f;
f = snd_pcm_build_linear_format(wid, pw, sgn, ed);
if (f != SND_PCM_FORMAT_UNKNOWN &&
snd_pcm_format_mask_test(format_mask, f))
return f;
}
sgn = !sgn;
}
ed = !ed;
}
return SND_PCM_FORMAT_UNKNOWN;
}
static snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format, const snd_pcm_format_mask_t *format_mask)
{
int w, w1, u, e;
snd_pcm_format_t f;
snd_pcm_format_mask_t lin = { SND_PCM_FMTBIT_LINEAR };
snd_pcm_format_mask_t fl = {
#ifdef BUILD_PCM_PLUGIN_LFLOAT
SND_PCM_FMTBIT_FLOAT
#else
{ 0 }
#endif
};
if (snd_pcm_format_mask_test(format_mask, format))
return format;
if (!snd_pcm_format_mask_test(&lin, format) &&
!snd_pcm_format_mask_test(&fl, format)) {
unsigned int i;
switch (format) {
#ifdef BUILD_PCM_PLUGIN_MULAW
case SND_PCM_FORMAT_MU_LAW:
#endif
#ifdef BUILD_PCM_PLUGIN_ALAW
case SND_PCM_FORMAT_A_LAW:
#endif
#ifdef BUILD_PCM_PLUGIN_ADPCM
case SND_PCM_FORMAT_IMA_ADPCM:
#endif
for (i = 0; i < sizeof(linear_preferred_formats) / sizeof(linear_preferred_formats[0]); ++i) {
snd_pcm_format_t f = linear_preferred_formats[i];
if (snd_pcm_format_mask_test(format_mask, f))
return f;
}
/* Fall through */
default:
return SND_PCM_FORMAT_UNKNOWN;
}
}
snd_mask_intersect(&lin, format_mask);
snd_mask_intersect(&fl, format_mask);
if (snd_mask_empty(&lin) && snd_mask_empty(&fl)) {
#ifdef BUILD_PCM_NONLINEAR
unsigned int i;
for (i = 0; i < sizeof(nonlinear_preferred_formats) / sizeof(nonlinear_preferred_formats[0]); ++i) {
snd_pcm_format_t f = nonlinear_preferred_formats[i];
if (snd_pcm_format_mask_test(format_mask, f))
return f;
}
#endif
return SND_PCM_FORMAT_UNKNOWN;
}
#ifdef BUILD_PCM_PLUGIN_LFLOAT
if (snd_pcm_format_float(format)) {
if (snd_pcm_format_mask_test(&fl, format)) {
unsigned int i;
for (i = 0; i < sizeof(float_preferred_formats) / sizeof(float_preferred_formats[0]); ++i) {
snd_pcm_format_t f = float_preferred_formats[i];
if (snd_pcm_format_mask_test(format_mask, f))
return f;
}
}
w = 32;
u = 0;
e = snd_pcm_format_big_endian(format);
} else
#endif
if (snd_mask_empty(&lin)) {
#ifdef BUILD_PCM_PLUGIN_LFLOAT
unsigned int i;
for (i = 0; i < sizeof(float_preferred_formats) / sizeof(float_preferred_formats[0]); ++i) {
snd_pcm_format_t f = float_preferred_formats[i];
if (snd_pcm_format_mask_test(format_mask, f))
return f;
}
#endif
return SND_PCM_FORMAT_UNKNOWN;
} else {
w = snd_pcm_format_width(format);
u = snd_pcm_format_unsigned(format);
e = snd_pcm_format_big_endian(format);
}
for (w1 = w; w1 <= 32; w1++) {
f = check_linear_format(format_mask, w1, u, e);
if (f != SND_PCM_FORMAT_UNKNOWN)
return f;
}
for (w1 = w - 1; w1 > 0; w1--) {
f = check_linear_format(format_mask, w1, u, e);
if (f != SND_PCM_FORMAT_UNKNOWN)
return f;
}
return SND_PCM_FORMAT_UNKNOWN;
}
static void snd_pcm_plug_clear(snd_pcm_t *pcm)
{
snd_pcm_plug_t *plug = pcm->private_data;
snd_pcm_t *slave = plug->req_slave;
/* Clear old plugins */
if (plug->gen.slave != slave) {
snd_pcm_unlink_hw_ptr(pcm, plug->gen.slave);
snd_pcm_unlink_appl_ptr(pcm, plug->gen.slave);
snd_pcm_close(plug->gen.slave);
plug->gen.slave = slave;
pcm->fast_ops = slave->fast_ops;
pcm->fast_op_arg = slave->fast_op_arg;
}
}
#ifndef DOC_HIDDEN
typedef struct {
snd_pcm_access_t access;
snd_pcm_format_t format;
unsigned int channels;
unsigned int rate;
} snd_pcm_plug_params_t;
#endif
#ifdef BUILD_PCM_PLUGIN_RATE
static int snd_pcm_plug_change_rate(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm_plug_params_t *clt, snd_pcm_plug_params_t *slv)
{
snd_pcm_plug_t *plug = pcm->private_data;
int err;
if (clt->rate == slv->rate)
return 0;
assert(snd_pcm_format_linear(slv->format));
err = snd_pcm_rate_open(new, NULL, slv->format, slv->rate, plug->rate_converter,
plug->gen.slave, plug->gen.slave != plug->req_slave);
if (err < 0)
return err;
slv->access = clt->access;
slv->rate = clt->rate;
if (snd_pcm_format_linear(clt->format))
slv->format = clt->format;
return 1;
}
#endif
#ifdef BUILD_PCM_PLUGIN_ROUTE
static int snd_pcm_plug_change_channels(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm_plug_params_t *clt, snd_pcm_plug_params_t *slv)
{
snd_pcm_plug_t *plug = pcm->private_data;
unsigned int tt_ssize, tt_cused, tt_sused;
snd_pcm_route_ttable_entry_t *ttable;
int err;
if (clt->channels == slv->channels &&
(!plug->ttable || plug->ttable_ok))
return 0;
if (clt->rate != slv->rate &&
clt->channels > slv->channels)
return 0;
assert(snd_pcm_format_linear(slv->format));
tt_ssize = slv->channels;
tt_cused = clt->channels;
tt_sused = slv->channels;
ttable = alloca(tt_cused * tt_sused * sizeof(*ttable));
if (plug->ttable) { /* expand or shrink table */
unsigned int c = 0, s = 0;
for (c = 0; c < tt_cused; c++) {
for (s = 0; s < tt_sused; s++) {
snd_pcm_route_ttable_entry_t v;
if (c >= plug->tt_cused)
v = 0;
else if (s >= plug->tt_sused)
v = 0;
else
v = plug->ttable[c * plug->tt_ssize + s];
ttable[c * tt_ssize + s] = v;
}
}
plug->ttable_ok = 1;
} else {
unsigned int k;
unsigned int c = 0, s = 0;
enum snd_pcm_plug_route_policy rpolicy = plug->route_policy;
int n;
for (k = 0; k < tt_cused * tt_sused; ++k)
ttable[k] = 0;
if (rpolicy == PLUG_ROUTE_POLICY_DEFAULT) {
rpolicy = PLUG_ROUTE_POLICY_COPY;
/* it's hack for mono conversion */
if (clt->channels == 1 || slv->channels == 1)
rpolicy = PLUG_ROUTE_POLICY_AVERAGE;
}
switch (rpolicy) {
case PLUG_ROUTE_POLICY_AVERAGE:
case PLUG_ROUTE_POLICY_DUP:
if (clt->channels > slv->channels) {
n = clt->channels;
} else {
n = slv->channels;
}
while (n-- > 0) {
snd_pcm_route_ttable_entry_t v = SND_PCM_PLUGIN_ROUTE_FULL;
if (rpolicy == PLUG_ROUTE_POLICY_AVERAGE) {
if (pcm->stream == SND_PCM_STREAM_PLAYBACK &&
clt->channels > slv->channels) {
int srcs = clt->channels / slv->channels;
if (s < clt->channels % slv->channels)
srcs++;
v /= srcs;
} else if (pcm->stream == SND_PCM_STREAM_CAPTURE &&
slv->channels > clt->channels) {
int srcs = slv->channels / clt->channels;
if (s < slv->channels % clt->channels)
srcs++;
v /= srcs;
}
}
ttable[c * tt_ssize + s] = v;
if (++c == clt->channels)
c = 0;
if (++s == slv->channels)
s = 0;
}
break;
case PLUG_ROUTE_POLICY_COPY:
if (clt->channels < slv->channels) {
n = clt->channels;
} else {
n = slv->channels;
}
for (c = 0; (int)c < n; c++)
ttable[c * tt_ssize + c] = SND_PCM_PLUGIN_ROUTE_FULL;
break;
default:
SNDERR("Invalid route policy");
break;
}
}
err = snd_pcm_route_open(new, NULL, slv->format, (int) slv->channels, ttable, tt_ssize, tt_cused, tt_sused, plug->gen.slave, plug->gen.slave != plug->req_slave);
if (err < 0)
return err;
slv->channels = clt->channels;
slv->access = clt->access;
if (snd_pcm_format_linear(clt->format))
slv->format = clt->format;
return 1;
}
#endif
static int snd_pcm_plug_change_format(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm_plug_params_t *clt, snd_pcm_plug_params_t *slv)
{
snd_pcm_plug_t *plug = pcm->private_data;
int err;
snd_pcm_format_t cfmt;
int (*f)(snd_pcm_t **_pcm, const char *name, snd_pcm_format_t sformat, snd_pcm_t *slave, int close_slave);
/* No conversion is needed */
if (clt->format == slv->format &&
clt->rate == slv->rate &&
clt->channels == slv->channels &&
(!plug->ttable || plug->ttable_ok))
return 0;
if (snd_pcm_format_linear(slv->format)) {
/* Conversion is done in another plugin */
if (clt->rate != slv->rate ||
clt->channels != slv->channels ||
(plug->ttable && !plug->ttable_ok))
return 0;
cfmt = clt->format;
switch (clt->format) {
#ifdef BUILD_PCM_PLUGIN_MULAW
case SND_PCM_FORMAT_MU_LAW:
f = snd_pcm_mulaw_open;
break;
#endif
#ifdef BUILD_PCM_PLUGIN_ALAW
case SND_PCM_FORMAT_A_LAW:
f = snd_pcm_alaw_open;
break;
#endif
#ifdef BUILD_PCM_PLUGIN_ADPCM
case SND_PCM_FORMAT_IMA_ADPCM:
f = snd_pcm_adpcm_open;
break;
#endif
default:
#ifdef BUILD_PCM_PLUGIN_LFLOAT
if (snd_pcm_format_float(clt->format))
f = snd_pcm_lfloat_open;
else
#endif
f = snd_pcm_linear_open;
break;
}
#ifdef BUILD_PCM_PLUGIN_LFLOAT
} else if (snd_pcm_format_float(slv->format)) {
if (snd_pcm_format_linear(clt->format)) {
cfmt = clt->format;
f = snd_pcm_lfloat_open;
} else if (clt->rate != slv->rate || clt->channels != slv->channels ||
(plug->ttable && !plug->ttable_ok)) {
cfmt = SND_PCM_FORMAT_S16;
f = snd_pcm_lfloat_open;
} else
return -EINVAL;
#endif
#ifdef BUILD_PCM_NONLINEAR
} else {
switch (slv->format) {
#ifdef BUILD_PCM_PLUGIN_MULAW
case SND_PCM_FORMAT_MU_LAW:
f = snd_pcm_mulaw_open;
break;
#endif
#ifdef BUILD_PCM_PLUGIN_ALAW
case SND_PCM_FORMAT_A_LAW:
f = snd_pcm_alaw_open;
break;
#endif
#ifdef BUILD_PCM_PLUGIN_ADPCM
case SND_PCM_FORMAT_IMA_ADPCM:
f = snd_pcm_adpcm_open;
break;
#endif
default:
return -EINVAL;
}
if (snd_pcm_format_linear(clt->format))
cfmt = clt->format;
else
cfmt = SND_PCM_FORMAT_S16;
#endif /* NONLINEAR */
}
err = f(new, NULL, slv->format, plug->gen.slave, plug->gen.slave != plug->req_slave);
if (err < 0)
return err;
slv->format = cfmt;
slv->access = clt->access;
return 1;
}
static int snd_pcm_plug_change_access(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm_plug_params_t *clt, snd_pcm_plug_params_t *slv)
{
snd_pcm_plug_t *plug = pcm->private_data;
int err;
if (clt->access == slv->access)
return 0;
err = snd_pcm_copy_open(new, NULL, plug->gen.slave, plug->gen.slave != plug->req_slave);
if (err < 0)
return err;
slv->access = clt->access;
return 1;
}
#ifdef BUILD_PCM_PLUGIN_MMAP_EMUL
static int snd_pcm_plug_change_mmap(snd_pcm_t *pcm, snd_pcm_t **new,
snd_pcm_plug_params_t *clt,
snd_pcm_plug_params_t *slv)
{
snd_pcm_plug_t *plug = pcm->private_data;
int err;
if (clt->access == slv->access)
return 0;
switch (slv->access) {
case SND_PCM_ACCESS_MMAP_INTERLEAVED:
case SND_PCM_ACCESS_MMAP_NONINTERLEAVED:
case SND_PCM_ACCESS_MMAP_COMPLEX:
return 0;
default:
break;
}
err = __snd_pcm_mmap_emul_open(new, NULL, plug->gen.slave,
plug->gen.slave != plug->req_slave);
if (err < 0)
return err;
switch (slv->access) {
case SND_PCM_ACCESS_RW_INTERLEAVED:
slv->access = SND_PCM_ACCESS_MMAP_INTERLEAVED;
break;
case SND_PCM_ACCESS_RW_NONINTERLEAVED:
slv->access = SND_PCM_ACCESS_MMAP_NONINTERLEAVED;
break;
default:
break;
}
return 1;
}
#endif
static int snd_pcm_plug_insert_plugins(snd_pcm_t *pcm,
snd_pcm_plug_params_t *client,
snd_pcm_plug_params_t *slave)
{
snd_pcm_plug_t *plug = pcm->private_data;
static int (*const funcs[])(snd_pcm_t *_pcm, snd_pcm_t **new, snd_pcm_plug_params_t *s, snd_pcm_plug_params_t *d) = {
#ifdef BUILD_PCM_PLUGIN_MMAP_EMUL
snd_pcm_plug_change_mmap,
#endif
snd_pcm_plug_change_format,
#ifdef BUILD_PCM_PLUGIN_ROUTE
snd_pcm_plug_change_channels,
#endif
#ifdef BUILD_PCM_PLUGIN_RATE
snd_pcm_plug_change_rate,
#endif
#ifdef BUILD_PCM_PLUGIN_ROUTE
snd_pcm_plug_change_channels,
#endif
snd_pcm_plug_change_format,
snd_pcm_plug_change_access
};
snd_pcm_plug_params_t p = *slave;
unsigned int k = 0;
plug->ttable_ok = 0;
while (client->format != p.format ||
client->channels != p.channels ||
client->rate != p.rate ||
client->access != p.access ||
(plug->ttable && !plug->ttable_ok)) {
snd_pcm_t *new;
int err;
if (k >= sizeof(funcs)/sizeof(*funcs)) {
snd_pcm_plug_clear(pcm);
return -EINVAL;
}
err = funcs[k](pcm, &new, client, &p);
if (err < 0) {
snd_pcm_plug_clear(pcm);
return err;
}
if (err) {
plug->gen.slave = new;
}
k++;
}
return 0;
}
static int snd_pcm_plug_hw_refine_cprepare(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params)
{
unsigned int rate_min, channels_max;
int err;
/* HACK: to avoid overflow in PARTBIT_RATE code */
err = snd_pcm_hw_param_get_min(params, SND_PCM_HW_PARAM_RATE, &rate_min, NULL);
if (err < 0)
return err;
if (rate_min < 4000) {
_snd_pcm_hw_param_set_min(params, SND_PCM_HW_PARAM_RATE, 4000, 0);
if (snd_pcm_hw_param_empty(params, SND_PCM_HW_PARAM_RATE))
return -EINVAL;
}
/* HACK: to avoid overflow in PERIOD_SIZE code */
err = snd_pcm_hw_param_get_max(params, SND_PCM_HW_PARAM_CHANNELS, &channels_max, NULL);
if (err < 0)
return err;
if (channels_max > 10000) {
_snd_pcm_hw_param_set_max(params, SND_PCM_HW_PARAM_CHANNELS, 10000, 0);
if (snd_pcm_hw_param_empty(params, SND_PCM_HW_PARAM_CHANNELS))
return -EINVAL;
}
return 0;
}
static int snd_pcm_plug_hw_refine_sprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *sparams)
{
snd_pcm_plug_t *plug = pcm->private_data;
int err;
_snd_pcm_hw_params_any(sparams);
if (plug->sformat >= 0) {
_snd_pcm_hw_params_set_format(sparams, plug->sformat);
_snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
}
if (plug->schannels > 0)
_snd_pcm_hw_param_set(sparams, SND_PCM_HW_PARAM_CHANNELS,
plug->schannels, 0);
if (plug->srate > 0)
_snd_pcm_hw_param_set_minmax(sparams, SND_PCM_HW_PARAM_RATE,
plug->srate, 0, plug->srate + 1, -1);
/* reduce the available configurations */
err = snd_pcm_hw_refine(plug->req_slave, sparams);
if (err < 0)
return err;
return 0;
}
static int check_access_change(snd_pcm_hw_params_t *cparams,
snd_pcm_hw_params_t *sparams)
{
snd_pcm_access_mask_t *smask;
#ifdef BUILD_PCM_PLUGIN_MMAP_EMUL
const snd_pcm_access_mask_t *cmask;
snd_pcm_access_mask_t mask;
#endif
smask = (snd_pcm_access_mask_t *)
snd_pcm_hw_param_get_mask(sparams,
SND_PCM_HW_PARAM_ACCESS);
if (snd_pcm_access_mask_test(smask, SND_PCM_ACCESS_MMAP_INTERLEAVED) ||
snd_pcm_access_mask_test(smask, SND_PCM_ACCESS_MMAP_NONINTERLEAVED) ||
snd_pcm_access_mask_test(smask, SND_PCM_ACCESS_MMAP_COMPLEX))
return 0; /* OK, we have mmap support */
#ifdef BUILD_PCM_PLUGIN_MMAP_EMUL
/* no mmap support - we need mmap emulation */
if (!snd_pcm_access_mask_test(smask, SND_PCM_ACCESS_RW_INTERLEAVED) &&
!snd_pcm_access_mask_test(smask, SND_PCM_ACCESS_RW_NONINTERLEAVED))
return -EINVAL; /* even no RW access? no way! */
cmask = (const snd_pcm_access_mask_t *)
snd_pcm_hw_param_get_mask(cparams,
SND_PCM_HW_PARAM_ACCESS);
snd_mask_none(&mask);
if (snd_pcm_access_mask_test(cmask, SND_PCM_ACCESS_RW_INTERLEAVED) ||
snd_pcm_access_mask_test(cmask, SND_PCM_ACCESS_MMAP_INTERLEAVED)) {
if (snd_pcm_access_mask_test(smask, SND_PCM_ACCESS_RW_INTERLEAVED))
snd_pcm_access_mask_set(&mask,
SND_PCM_ACCESS_RW_INTERLEAVED);
}
if (snd_pcm_access_mask_test(cmask, SND_PCM_ACCESS_RW_NONINTERLEAVED) ||
snd_pcm_access_mask_test(cmask, SND_PCM_ACCESS_MMAP_NONINTERLEAVED)) {
if (snd_pcm_access_mask_test(smask, SND_PCM_ACCESS_RW_NONINTERLEAVED))
snd_pcm_access_mask_set(&mask,
SND_PCM_ACCESS_RW_NONINTERLEAVED);
}
if (!snd_mask_empty(&mask))
*smask = mask; /* prefer the straight conversion */
return 0;
#else
return -EINVAL;
#endif
}
static int snd_pcm_plug_hw_refine_schange(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
snd_pcm_hw_params_t *sparams)
{
snd_pcm_plug_t *plug = pcm->private_data;
snd_pcm_t *slave = plug->req_slave;
unsigned int links = (SND_PCM_HW_PARBIT_PERIOD_TIME |
SND_PCM_HW_PARBIT_TICK_TIME);
const snd_pcm_format_mask_t *format_mask, *sformat_mask;
snd_pcm_format_mask_t sfmt_mask;
int err;
snd_pcm_format_t format;
snd_interval_t t, buffer_size;
const snd_interval_t *srate, *crate;
if (plug->srate == -2 ||
(pcm->mode & SND_PCM_NO_AUTO_RESAMPLE) ||
(params->flags & SND_PCM_HW_PARAMS_NORESAMPLE))
links |= SND_PCM_HW_PARBIT_RATE;
else {
err = snd_pcm_hw_param_refine_multiple(slave, sparams, SND_PCM_HW_PARAM_RATE, params);
if (err < 0)
return err;
}
if (plug->schannels == -2 || (pcm->mode & SND_PCM_NO_AUTO_CHANNELS))
links |= SND_PCM_HW_PARBIT_CHANNELS;
else {
err = snd_pcm_hw_param_refine_near(slave, sparams, SND_PCM_HW_PARAM_CHANNELS, params);
if (err < 0)
return err;
}
if (plug->sformat == -2 || (pcm->mode & SND_PCM_NO_AUTO_FORMAT))
links |= SND_PCM_HW_PARBIT_FORMAT;
else {
format_mask = snd_pcm_hw_param_get_mask(params, SND_PCM_HW_PARAM_FORMAT);
sformat_mask = snd_pcm_hw_param_get_mask(sparams, SND_PCM_HW_PARAM_FORMAT);
snd_mask_none(&sfmt_mask);
for (format = 0; format <= SND_PCM_FORMAT_LAST; format++) {
snd_pcm_format_t f;
if (!snd_pcm_format_mask_test(format_mask, format))
continue;
if (snd_pcm_format_mask_test(sformat_mask, format))
f = format;
else {
f = snd_pcm_plug_slave_format(format, sformat_mask);
if (f == SND_PCM_FORMAT_UNKNOWN)
continue;
}
snd_pcm_format_mask_set(&sfmt_mask, f);
}
if (snd_pcm_format_mask_empty(&sfmt_mask)) {
SNDERR("Unable to find an usable slave format for '%s'", pcm->name);
for (format = 0; format <= SND_PCM_FORMAT_LAST; format++) {
if (!snd_pcm_format_mask_test(format_mask, format))
continue;
SNDERR("Format: %s", snd_pcm_format_name(format));
}
for (format = 0; format <= SND_PCM_FORMAT_LAST; format++) {
if (!snd_pcm_format_mask_test(sformat_mask, format))
continue;
SNDERR("Slave format: %s", snd_pcm_format_name(format));
}
return -EINVAL;
}
err = snd_pcm_hw_param_set_mask(slave, sparams, SND_CHANGE,
SND_PCM_HW_PARAM_FORMAT, &sfmt_mask);
if (err < 0)
return -EINVAL;
}
if (snd_pcm_hw_param_never_eq(params, SND_PCM_HW_PARAM_ACCESS, sparams)) {
err = check_access_change(params, sparams);
if (err < 0) {
SNDERR("Unable to find an usable access for '%s'",
pcm->name);
return err;
}
}
if ((links & SND_PCM_HW_PARBIT_RATE) ||
snd_pcm_hw_param_always_eq(params, SND_PCM_HW_PARAM_RATE, sparams))
links |= (SND_PCM_HW_PARBIT_PERIOD_SIZE |
SND_PCM_HW_PARBIT_BUFFER_SIZE);
else {
snd_interval_copy(&buffer_size, snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_BUFFER_SIZE));
snd_interval_unfloor(&buffer_size);
crate = snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_RATE);
srate = snd_pcm_hw_param_get_interval(sparams, SND_PCM_HW_PARAM_RATE);
snd_interval_muldiv(&buffer_size, srate, crate, &t);
err = _snd_pcm_hw_param_set_interval(sparams, SND_PCM_HW_PARAM_BUFFER_SIZE, &t);
if (err < 0)
return err;
}
err = _snd_pcm_hw_params_refine(sparams, links, params);
if (err < 0)
return err;
return 0;
}
static int snd_pcm_plug_hw_refine_cchange(snd_pcm_t *pcm ATTRIBUTE_UNUSED,
snd_pcm_hw_params_t *params,
snd_pcm_hw_params_t *sparams)
{
snd_pcm_plug_t *plug = pcm->private_data;
unsigned int links = (SND_PCM_HW_PARBIT_PERIOD_TIME |
SND_PCM_HW_PARBIT_TICK_TIME);
const snd_pcm_format_mask_t *format_mask, *sformat_mask;
snd_pcm_format_mask_t fmt_mask;
int err;
snd_pcm_format_t format;
snd_interval_t t;
const snd_interval_t *sbuffer_size;
const snd_interval_t *srate, *crate;
if (plug->schannels == -2 || (pcm->mode & SND_PCM_NO_AUTO_CHANNELS))
links |= SND_PCM_HW_PARBIT_CHANNELS;
if (plug->sformat == -2 || (pcm->mode & SND_PCM_NO_AUTO_FORMAT))
links |= SND_PCM_HW_PARBIT_FORMAT;
else {
format_mask = snd_pcm_hw_param_get_mask(params,
SND_PCM_HW_PARAM_FORMAT);
sformat_mask = snd_pcm_hw_param_get_mask(sparams,
SND_PCM_HW_PARAM_FORMAT);
snd_mask_none(&fmt_mask);
for (format = 0; format <= SND_PCM_FORMAT_LAST; format++) {
snd_pcm_format_t f;
if (!snd_pcm_format_mask_test(format_mask, format))
continue;
if (snd_pcm_format_mask_test(sformat_mask, format))
f = format;
else {
f = snd_pcm_plug_slave_format(format, sformat_mask);
if (f == SND_PCM_FORMAT_UNKNOWN)
continue;
}
snd_pcm_format_mask_set(&fmt_mask, format);
}
if (snd_pcm_format_mask_empty(&fmt_mask)) {
SNDERR("Unable to find an usable client format");
for (format = 0; format <= SND_PCM_FORMAT_LAST; format++) {
if (!snd_pcm_format_mask_test(format_mask, format))
continue;
SNDERR("Format: %s", snd_pcm_format_name(format));
}
for (format = 0; format <= SND_PCM_FORMAT_LAST; format++) {
if (!snd_pcm_format_mask_test(sformat_mask, format))
continue;
SNDERR("Slave format: %s", snd_pcm_format_name(format));
}
return -EINVAL;
}
err = _snd_pcm_hw_param_set_mask(params,
SND_PCM_HW_PARAM_FORMAT, &fmt_mask);
if (err < 0)
return err;
}
if (plug->srate == -2 ||
(pcm->mode & SND_PCM_NO_AUTO_RESAMPLE) ||
(params->flags & SND_PCM_HW_PARAMS_NORESAMPLE))
links |= SND_PCM_HW_PARBIT_RATE;
else {
unsigned int rate_min, srate_min;
int rate_mindir, srate_mindir;
/* This is a temporary hack, waiting for a better solution */
err = snd_pcm_hw_param_get_min(params, SND_PCM_HW_PARAM_RATE, &rate_min, &rate_mindir);
if (err < 0)
return err;
err = snd_pcm_hw_param_get_min(sparams, SND_PCM_HW_PARAM_RATE, &srate_min, &srate_mindir);
if (err < 0)
return err;
if (rate_min == srate_min && srate_mindir > rate_mindir) {
err = _snd_pcm_hw_param_set_min(params, SND_PCM_HW_PARAM_RATE, srate_min, srate_mindir);
if (err < 0)
return err;
}
}
if ((links & SND_PCM_HW_PARBIT_RATE) ||
snd_pcm_hw_param_always_eq(params, SND_PCM_HW_PARAM_RATE, sparams))
links |= (SND_PCM_HW_PARBIT_PERIOD_SIZE |
SND_PCM_HW_PARBIT_BUFFER_SIZE);
else {
sbuffer_size = snd_pcm_hw_param_get_interval(sparams, SND_PCM_HW_PARAM_BUFFER_SIZE);
crate = snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_RATE);
srate = snd_pcm_hw_param_get_interval(sparams, SND_PCM_HW_PARAM_RATE);
snd_interval_muldiv(sbuffer_size, crate, srate, &t);
snd_interval_floor(&t);
if (snd_interval_empty(&t))
return -EINVAL;
err = _snd_pcm_hw_param_set_interval(params, SND_PCM_HW_PARAM_BUFFER_SIZE, &t);
if (err < 0)
return err;
}
err = _snd_pcm_hw_params_refine(params, links, sparams);
if (err < 0)
return err;
/* FIXME */
params->info &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID);
return 0;
}
static int snd_pcm_plug_hw_refine_slave(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
snd_pcm_plug_t *plug = pcm->private_data;
return snd_pcm_hw_refine(plug->req_slave, params);
}
static int snd_pcm_plug_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
return snd_pcm_hw_refine_slave(pcm, params,
snd_pcm_plug_hw_refine_cprepare,
snd_pcm_plug_hw_refine_cchange,
snd_pcm_plug_hw_refine_sprepare,
snd_pcm_plug_hw_refine_schange,
snd_pcm_plug_hw_refine_slave);
}
static int snd_pcm_plug_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
snd_pcm_plug_t *plug = pcm->private_data;
snd_pcm_t *slave = plug->req_slave;
snd_pcm_plug_params_t clt_params, slv_params;
snd_pcm_hw_params_t sparams;
int err;
err = snd_pcm_plug_hw_refine_sprepare(pcm, &sparams);
if (err < 0)
return err;
err = snd_pcm_plug_hw_refine_schange(pcm, params, &sparams);
if (err < 0)
return err;
err = snd_pcm_hw_refine_soft(slave, &sparams);
if (err < 0)
return err;
INTERNAL(snd_pcm_hw_params_get_access)(params, &clt_params.access);
INTERNAL(snd_pcm_hw_params_get_format)(params, &clt_params.format);
INTERNAL(snd_pcm_hw_params_get_channels)(params, &clt_params.channels);
INTERNAL(snd_pcm_hw_params_get_rate)(params, &clt_params.rate, 0);
INTERNAL(snd_pcm_hw_params_get_format)(&sparams, &slv_params.format);
INTERNAL(snd_pcm_hw_params_get_channels)(&sparams, &slv_params.channels);
INTERNAL(snd_pcm_hw_params_get_rate)(&sparams, &slv_params.rate, 0);
snd_pcm_plug_clear(pcm);
if (!(clt_params.format == slv_params.format &&
clt_params.channels == slv_params.channels &&
clt_params.rate == slv_params.rate &&
!plug->ttable &&
snd_pcm_hw_params_test_access(slave, &sparams,
clt_params.access) >= 0)) {
INTERNAL(snd_pcm_hw_params_set_access_first)(slave, &sparams, &slv_params.access);
err = snd_pcm_plug_insert_plugins(pcm, &clt_params, &slv_params);
if (err < 0)
return err;
}
slave = plug->gen.slave;
err = _snd_pcm_hw_params_internal(slave, params);
if (err < 0) {
snd_pcm_plug_clear(pcm);
return err;
}
snd_pcm_unlink_hw_ptr(pcm, plug->req_slave);
snd_pcm_unlink_appl_ptr(pcm, plug->req_slave);
pcm->fast_ops = slave->fast_ops;
pcm->fast_op_arg = slave->fast_op_arg;
snd_pcm_link_hw_ptr(pcm, slave);
snd_pcm_link_appl_ptr(pcm, slave);
return 0;
}
static int snd_pcm_plug_hw_free(snd_pcm_t *pcm)
{
snd_pcm_plug_t *plug = pcm->private_data;
snd_pcm_t *slave = plug->gen.slave;
int err = snd_pcm_hw_free(slave);
snd_pcm_plug_clear(pcm);
return err;
}
static void snd_pcm_plug_dump(snd_pcm_t *pcm, snd_output_t *out)
{
snd_pcm_plug_t *plug = pcm->private_data;
snd_output_printf(out, "Plug PCM: ");
snd_pcm_dump(plug->gen.slave, out);
}
static const snd_pcm_ops_t snd_pcm_plug_ops = {
.close = snd_pcm_plug_close,
.info = snd_pcm_plug_info,
.hw_refine = snd_pcm_plug_hw_refine,
.hw_params = snd_pcm_plug_hw_params,
.hw_free = snd_pcm_plug_hw_free,
.sw_params = snd_pcm_generic_sw_params,
.channel_info = snd_pcm_generic_channel_info,
.dump = snd_pcm_plug_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 Plug 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_plug_open(snd_pcm_t **pcmp,
const char *name,
snd_pcm_format_t sformat, int schannels, int srate,
const snd_config_t *rate_converter,
enum snd_pcm_plug_route_policy route_policy,
snd_pcm_route_ttable_entry_t *ttable,
unsigned int tt_ssize,
unsigned int tt_cused, unsigned int tt_sused,
snd_pcm_t *slave, int close_slave)
{
snd_pcm_t *pcm;
snd_pcm_plug_t *plug;
int err;
assert(pcmp && slave);
plug = calloc(1, sizeof(snd_pcm_plug_t));
if (!plug)
return -ENOMEM;
plug->sformat = sformat;
plug->schannels = schannels;
plug->srate = srate;
plug->gen.slave = plug->req_slave = slave;
plug->gen.close_slave = close_slave;
plug->route_policy = route_policy;
plug->ttable = ttable;
plug->tt_ssize = tt_ssize;
plug->tt_cused = tt_cused;
plug->tt_sused = tt_sused;
err = snd_pcm_new(&pcm, SND_PCM_TYPE_PLUG, name, slave->stream, slave->mode);
if (err < 0) {
free(plug);
return err;
}
pcm->ops = &snd_pcm_plug_ops;
pcm->fast_ops = slave->fast_ops;
pcm->fast_op_arg = slave->fast_op_arg;
if (rate_converter) {
err = snd_config_copy(&plug->rate_converter,
(snd_config_t *)rate_converter);
if (err < 0) {
snd_pcm_free(pcm);
free(plug);
return err;
}
}
pcm->private_data = plug;
pcm->poll_fd = slave->poll_fd;
pcm->poll_events = slave->poll_events;
pcm->mmap_shadow = 1;
pcm->tstamp_type = slave->tstamp_type;
snd_pcm_link_hw_ptr(pcm, slave);
snd_pcm_link_appl_ptr(pcm, slave);
*pcmp = pcm;
return 0;
}
/*! \page pcm_plugins
\section pcm_plugins_plug Automatic conversion plugin
This plugin converts channels, rate and format on request.
\code
pcm.name {
type plug # Automatic conversion PCM
slave STR # Slave name
# or
slave { # Slave definition
pcm STR # Slave PCM name
# or
pcm { } # Slave PCM definition
[format STR] # Slave format (default nearest) or "unchanged"
[channels INT] # Slave channels (default nearest) or "unchanged"
[rate INT] # Slave rate (default nearest) or "unchanged"
}
route_policy STR # route policy for automatic ttable generation
# STR can be 'default', 'average', 'copy', 'duplicate'
# average: result is average of input channels
# copy: only first channels are copied to destination
# duplicate: duplicate first set of channels
# default: copy policy, except for mono capture - sum
ttable { # Transfer table (bi-dimensional compound of cchannels * schannels numbers)
CCHANNEL {
SCHANNEL REAL # route value (0.0 - 1.0)
}
}
rate_converter STR # type of rate converter
# or
rate_converter [ STR1 STR2 ... ]
# type of rate converter
# default value is taken from defaults.pcm.rate_converter
}
\endcode
\subsection pcm_plugins_plug_funcref Function reference
<UL>
<LI>snd_pcm_plug_open()
<LI>_snd_pcm_plug_open()
</UL>
*/
/**
* \brief Creates a new Plug PCM
* \param pcmp Returns created PCM handle
* \param name Name of PCM
* \param root Root configuration node
* \param conf Configuration node with Plug 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_plug_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_config_t *tt = NULL;
enum snd_pcm_plug_route_policy route_policy = PLUG_ROUTE_POLICY_DEFAULT;
snd_pcm_route_ttable_entry_t *ttable = NULL;
unsigned int csize, ssize;
unsigned int cused, sused;
snd_pcm_format_t sformat = SND_PCM_FORMAT_UNKNOWN;
int schannels = -1, srate = -1;
const snd_config_t *rate_converter = NULL;
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;
}
#ifdef BUILD_PCM_PLUGIN_ROUTE
if (strcmp(id, "ttable") == 0) {
route_policy = PLUG_ROUTE_POLICY_NONE;
if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND) {
SNDERR("Invalid type for %s", id);
return -EINVAL;
}
tt = n;
continue;
}
if (strcmp(id, "route_policy") == 0) {
const char *str;
if ((err = snd_config_get_string(n, &str)) < 0) {
SNDERR("Invalid type for %s", id);
return -EINVAL;
}
if (tt != NULL)
SNDERR("Table is defined, route policy is ignored");
if (!strcmp(str, "default"))
route_policy = PLUG_ROUTE_POLICY_DEFAULT;
else if (!strcmp(str, "average"))
route_policy = PLUG_ROUTE_POLICY_AVERAGE;
else if (!strcmp(str, "copy"))
route_policy = PLUG_ROUTE_POLICY_COPY;
else if (!strcmp(str, "duplicate"))
route_policy = PLUG_ROUTE_POLICY_DUP;
continue;
}
#endif
#ifdef BUILD_PCM_PLUGIN_RATE
if (strcmp(id, "rate_converter") == 0) {
rate_converter = n;
continue;
}
#endif
SNDERR("Unknown field %s", id);
return -EINVAL;
}
if (!slave) {
SNDERR("slave is not defined");
return -EINVAL;
}
err = snd_pcm_slave_conf(root, slave, &sconf, 3,
SND_PCM_HW_PARAM_FORMAT, SCONF_UNCHANGED, &sformat,
SND_PCM_HW_PARAM_CHANNELS, SCONF_UNCHANGED, &schannels,
SND_PCM_HW_PARAM_RATE, SCONF_UNCHANGED, &srate);
if (err < 0)
return err;
#ifdef BUILD_PCM_PLUGIN_ROUTE
if (tt) {
err = snd_pcm_route_determine_ttable(tt, &csize, &ssize);
if (err < 0) {
snd_config_delete(sconf);
return err;
}
ttable = malloc(csize * ssize * sizeof(*ttable));
if (ttable == NULL) {
snd_config_delete(sconf);
return err;
}
err = snd_pcm_route_load_ttable(tt, ttable, csize, ssize, &cused, &sused, -1);
if (err < 0) {
snd_config_delete(sconf);
return err;
}
}
#endif
#ifdef BUILD_PCM_PLUGIN_RATE
if (! rate_converter)
rate_converter = snd_pcm_rate_get_default_converter(root);
#endif
err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode, conf);
snd_config_delete(sconf);
if (err < 0)
return err;
err = snd_pcm_plug_open(pcmp, name, sformat, schannels, srate, rate_converter,
route_policy, ttable, ssize, cused, sused, spcm, 1);
if (err < 0)
snd_pcm_close(spcm);
return err;
}
#ifndef DOC_HIDDEN
SND_DLSYM_BUILD_VERSION(_snd_pcm_plug_open, SND_PCM_DLSYM_VERSION);
#endif