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audioconvert: add volume control

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This commit is contained in:
Wim Taymans 2018-07-03 21:34:22 +02:00
parent e5c2896fca
commit 8f97e0dd31
4 changed files with 138 additions and 27 deletions
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65
spa/plugins/audioconvert/channelmix-ops.c
View file

@ -22,13 +22,34 @@
#include <spa/utils/defs.h>
#define VOLUME_MIN 0.0f
#define VOLUME_NORM 1.0f
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);
int i, j;
float *m = matrix;
float v = m[0];
if (v <= VOLUME_MIN) {
for (i = 0; i < n_src; i++)
memset(dst[i], 0, n_bytes);
}
else if (v == VOLUME_NORM) {
for (i = 0; i < n_src; i++)
memcpy(dst[i], src[i], n_bytes);
}
else {
float **d = (float **) dst;
float **s = (float **) src;
int n_samples = n_bytes / sizeof(float);
for (i = 0; i < n_src; i++)
for (j = 0; j < n_samples; j++)
d[i][j] = s[i][j] * v;
}
}
static void
@ -60,11 +81,20 @@ channelmix_f32_1_2(void *data, int n_dst, void *dst[n_dst],
int n, n_samples;
float **d = (float **) dst;
const float *s = src[0];
float *m = matrix;
float v = m[0];
n_samples = n_bytes / sizeof(float);
for (n = 0; n < n_samples; n++) {
d[0][n] = s[n];
d[1][n] = s[n];
if (v <= VOLUME_MIN) {
memset(d[0], 0, n_bytes);
}
else if (v == VOLUME_NORM) {
for (n = 0; n < n_samples; n++)
d[0][n] = d[1][n] = s[n];
}
else {
for (n = 0; n < n_samples; n++)
d[0][n] = d[1][n] = s[n] * v;
}
}
@ -75,10 +105,22 @@ channelmix_f32_2_1(void *data, int n_dst, void *dst[n_dst],
int n, n_samples;
float *d = dst[0];
float **s = (float **) src;
float *m = matrix;
float v = m[0];
n_samples = n_bytes / sizeof(float);
for (n = 0; n < n_samples; n++)
d[n] = (s[0][n] + s[1][n]) * 0.5f;
if (v <= VOLUME_MIN) {
memset(d, 0, n_bytes);
}
else if (v == VOLUME_NORM) {
for (n = 0; n < n_samples; n++)
d[n] = (s[0][n] + s[1][n]) * 0.5f;
}
else {
v *= 0.5f;
for (n = 0; n < n_samples; n++)
d[n] = (s[0][n] + s[1][n]) * v;
}
}
typedef void (*channelmix_func_t) (void *data, int n_dst, void *dst[n_dst],
@ -91,13 +133,12 @@ static const struct channelmix_info {
uint32_t dst_chan;
channelmix_func_t func;
#define CHANNELMIX_INFO_FLAG_NO_MATRIX (1 << 0)
uint32_t flags;
} channelmix_table[] =
{
{ -2, -2, channelmix_copy, CHANNELMIX_INFO_FLAG_NO_MATRIX },
{ 1, 2, channelmix_f32_1_2, CHANNELMIX_INFO_FLAG_NO_MATRIX },
{ 2, 1, channelmix_f32_2_1, CHANNELMIX_INFO_FLAG_NO_MATRIX },
{ -2, -2, channelmix_copy, 0 },
{ 1, 2, channelmix_f32_1_2, 0 },
{ 2, 1, channelmix_f32_2_1, 0 },
{ -1, -1, channelmix_f32_n_m, 0 },
};