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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk.com>
PulseAudio 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.
PulseAudio 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
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <pulse/sample.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include "remap.h"
static void remap_mono_to_stereo_c (pa_remap_t *m, void *dst, const void *src, unsigned n) {
unsigned i;
switch (*m->format) {
case PA_SAMPLE_FLOAT32NE:
{
float *d, *s;
d = (float *) dst;
s = (float *) src;
for (i = n >> 2; i; i--) {
d[0] = d[1] = s[0];
d[2] = d[3] = s[1];
d[4] = d[5] = s[2];
d[6] = d[7] = s[3];
s += 4;
d += 8;
}
for (i = n & 3; i; i--) {
d[0] = d[1] = s[0];
s++;
d += 2;
}
break;
}
case PA_SAMPLE_S16NE:
{
int16_t *d, *s;
d = (int16_t *) dst;
s = (int16_t *) src;
for (i = n >> 2; i; i--) {
d[0] = d[1] = s[0];
d[2] = d[3] = s[1];
d[4] = d[5] = s[2];
d[6] = d[7] = s[3];
s += 4;
d += 8;
}
for (i = n & 3; i; i--) {
d[0] = d[1] = s[0];
s++;
d += 2;
}
break;
}
default:
pa_assert_not_reached();
}
}
static void remap_channels_matrix_c (pa_remap_t *m, void *dst, const void *src, unsigned n) {
unsigned oc, ic, i;
unsigned n_ic, n_oc;
n_ic = m->i_ss->channels;
n_oc = m->o_ss->channels;
switch (*m->format) {
case PA_SAMPLE_FLOAT32NE:
{
float *d, *s;
memset(dst, 0, n * sizeof (float) * n_oc);
for (oc = 0; oc < n_oc; oc++) {
for (ic = 0; ic < n_ic; ic++) {
float vol;
vol = m->map_table_f[oc][ic];
if (vol <= 0.0)
continue;
d = (float *)dst + oc;
s = (float *)src + ic;
if (vol >= 1.0) {
for (i = n; i > 0; i--, s += n_ic, d += n_oc)
*d += *s;
} else {
for (i = n; i > 0; i--, s += n_ic, d += n_oc)
*d += *s * vol;
}
}
}
break;
}
case PA_SAMPLE_S16NE:
{
int16_t *d, *s;
memset(dst, 0, n * sizeof (int16_t) * n_oc);
for (oc = 0; oc < n_oc; oc++) {
for (ic = 0; ic < n_ic; ic++) {
int32_t vol;
vol = m->map_table_i[oc][ic];
if (vol <= 0)
continue;
d = (int16_t *)dst + oc;
s = (int16_t *)src + ic;
if (vol >= 0x10000) {
for (i = n; i > 0; i--, s += n_ic, d += n_oc)
*d += *s;
} else {
for (i = n; i > 0; i--, s += n_ic, d += n_oc)
*d += (int16_t) (((int32_t)*s * vol) >> 16);
}
}
}
break;
}
default:
pa_assert_not_reached();
}
}
/* set the function that will execute the remapping based on the matrices */
static void init_remap_c (pa_remap_t *m) {
unsigned n_oc, n_ic;
n_oc = m->o_ss->channels;
n_ic = m->i_ss->channels;
/* find some common channel remappings, fall back to full matrix operation. */
if (n_ic == 1 && n_oc == 2 &&
m->map_table_f[0][0] >= 1.0 && m->map_table_f[1][0] >= 1.0) {
m->do_remap = (pa_do_remap_func_t) remap_mono_to_stereo_c;
pa_log_info("Using mono to stereo remapping");
} else {
m->do_remap = (pa_do_remap_func_t) remap_channels_matrix_c;
pa_log_info("Using generic matrix remapping");
}
}
/* default C implementation */
static pa_init_remap_func_t remap_func = init_remap_c;
void pa_init_remap (pa_remap_t *m) {
pa_assert (remap_func);
m->do_remap = NULL;
/* call the installed remap init function */
remap_func (m);
if (m->do_remap == NULL) {
/* nothing was installed, fallback to C version */
init_remap_c (m);
}
}
pa_init_remap_func_t pa_get_init_remap_func(void) {
return remap_func;
}
void pa_set_init_remap_func(pa_init_remap_func_t func) {
remap_func = func;
}
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