mirrors/pipewire
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pipewire/pipewire.git synced 2025-12-15 08:56:38 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

stream: more work on converter

Browse source
This commit is contained in:
Wim Taymans 2018-04-06 18:39:07 +02:00
parent 19067dde17
commit 142ef38df9
10 changed files with 2746 additions and 212 deletions
Download patch file Download diff file Expand all files Collapse all files

115
spa/plugins/audioconvert/channelmix-ops.c Normal file
View file

@ -0,0 +1,115 @@
/* Spa
* Copyright (C) 2018 Wim Taymans <wim.taymans@gmail.com>
*
* 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 library 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <string.h>
#include <stdio.h>
#include <spa/utils/defs.h>
static void
channelmix_copy(void *data, int n_dst, void *dst[n_dst],
int n_src, const void *src[n_src], void *matrix, int n_bytes)
{
int i;
for (i = 0; i < n_src; i++)
memcpy(dst[i], src[i], n_bytes);
}
static void
channelmix_f32_n_m(void *data, int n_dst, void *dst[n_dst],
int n_src, const void *src[n_src], void *matrix, int n_bytes)
{
int i, j, n, n_samples;
float **d = (float **) dst;
float **s = (float **) src;
float *m = matrix;
n_samples = n_bytes / sizeof(float);
for (n = 0; n < n_samples; n++) {
for (i = 0; i < n_dst; i++) {
float sum = 0.0f;
for (j = 0; j < n_src; j++)
sum += s[j][n] * m[i * n_src + j];
d[i][n] = sum;
}
}
}
static void
channelmix_f32_1_2(void *data, int n_dst, void *dst[n_dst],
int n_src, const void *src[n_src], void *matrix, int n_bytes)
{
int n, n_samples;
float **d = (float **) dst;
float **s = (float **) src;
n_samples = n_bytes / sizeof(float);
for (n = 0; n < n_samples; n++) {
d[0][n] = s[0][n];
d[1][n] = s[0][n];
}
}
static void
channelmix_f32_2_1(void *data, int n_dst, void *dst[n_dst],
int n_src, const void *src[n_src], void *matrix, int n_bytes)
{
int n, n_samples;
float **d = (float **) dst;
float **s = (float **) src;
n_samples = n_bytes / sizeof(float);
for (n = 0; n < n_samples; n++)
d[0][n] = (s[0][n] + s[1][n]) * 0.5f;
}
typedef void (*channelmix_func_t) (void *data, int n_dst, void *dst[n_dst],
int n_src, const void *src[n_src],
void *matrix, int n_bytes);
static const struct channelmix_info {
uint32_t src_chan;
uint32_t dst_chan;
channelmix_func_t func;
#define CHANNELMIX_INFO_FLAG_NO_MATRIX (1 << 0)
uint32_t flags;
} channelmix_table[] =
{
{ 1, 2, channelmix_f32_1_2, CHANNELMIX_INFO_FLAG_NO_MATRIX },
{ 2, 1, channelmix_f32_2_1, CHANNELMIX_INFO_FLAG_NO_MATRIX },
{ -1, -1, channelmix_f32_n_m, 0 },
};
#define MATCH_CHAN(a,b) ((a) == -1 || (a) == (b))
static const struct channelmix_info *find_channelmix_info(uint32_t src_chan, uint32_t dst_chan)
{
int i;
for (i = 0; i < SPA_N_ELEMENTS(channelmix_table); i++) {
if (MATCH_CHAN(channelmix_table[i].src_chan, src_chan) &&
MATCH_CHAN(channelmix_table[i].dst_chan, dst_chan))
return &channelmix_table[i];
}
return NULL;
}