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channelmix: add option for stereo widen

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When generating FC, add an option to subtract some of the generated
FC from the FL and FR channel to move the sound more to the center.

See #861
This commit is contained in:
Wim Taymans 2022-03-01 10:28:11 +01:00
parent 60b338d4cf
commit 5dd0a12875
7 changed files with 39 additions and 12 deletions
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32
spa/plugins/audioconvert/channelmix-ops-c.c
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@ -249,8 +249,9 @@ channelmix_f32_2_3p1_c(struct channelmix *mix, void * SPA_RESTRICT dst[],
else if (v0 == 1.0f && v1 == 1.0f) {
for (n = 0; n < n_samples; n++) {
float c = s[0][n] + s[1][n];
d[0][n] = s[0][n];
d[1][n] = s[1][n];
float w = c * mix->widen;
d[0][n] = s[0][n] - w;
d[1][n] = s[1][n] - w;
d[2][n] = c;
}
lr4_process(&mix->lr4[3], d[3], d[2], v3, n_samples);
@ -259,8 +260,9 @@ channelmix_f32_2_3p1_c(struct channelmix *mix, void * SPA_RESTRICT dst[],
else {
for (n = 0; n < n_samples; n++) {
float c = s[0][n] + s[1][n];
d[0][n] = s[0][n] * v0;
d[1][n] = s[1][n] * v1;
float w = c * mix->widen;
d[0][n] = (s[0][n] - w) * v0;
d[1][n] = (s[1][n] - w) * v1;
d[2][n] = c;
}
lr4_process(&mix->lr4[3], d[3], d[2], v3, n_samples);
@ -290,9 +292,10 @@ channelmix_f32_2_5p1_c(struct channelmix *mix, void * SPA_RESTRICT dst[],
else if (v0 == 1.0f && v1 == 1.0f) {
for (n = 0; n < n_samples; n++) {
float c = s[0][n] + s[1][n];
float w = c * mix->widen;
float m = s[0][n] - s[1][n];
d[0][n] = s[0][n];
d[1][n] = s[1][n];
d[0][n] = s[0][n] - w;
d[1][n] = s[1][n] - w;
d[3][n] = c;
d[5][n] = m;
}
@ -307,9 +310,10 @@ channelmix_f32_2_5p1_c(struct channelmix *mix, void * SPA_RESTRICT dst[],
else {
for (n = 0; n < n_samples; n++) {
float c = s[0][n] + s[1][n];
float w = c * mix->widen;
float m = s[0][n] - s[1][n];
d[0][n] = s[0][n] * v0;
d[1][n] = s[1][n] * v1;
d[0][n] = (s[0][n] - w) * v0;
d[1][n] = (s[1][n] - w) * v1;
d[3][n] = c;
d[5][n] = m;
}
@ -346,10 +350,13 @@ channelmix_f32_2_7p1_c(struct channelmix *mix, void * SPA_RESTRICT dst[],
else if (v0 == 1.0f && v1 == 1.0f && v4 == 1.0f && v5 == 1.0f) {
for (n = 0; n < n_samples; n++) {
float c = s[0][n] + s[1][n];
float w = c * mix->widen;
float m = s[0][n] - s[1][n];
d[0][n] = d[4][n] = s[0][n];
d[1][n] = d[5][n] = s[1][n];
d[0][n] = s[0][n] - w;
d[1][n] = s[1][n] - w;
d[3][n] = c;
d[4][n] = s[0][n];
d[5][n] = s[1][n];
d[7][n] = m;
}
lr4_process(&mix->lr4[2], d[2], d[3], v2, n_samples);
@ -363,9 +370,10 @@ channelmix_f32_2_7p1_c(struct channelmix *mix, void * SPA_RESTRICT dst[],
else {
for (n = 0; n < n_samples; n++) {
float c = s[0][n] + s[1][n];
float w = c * mix->widen;
float m = s[0][n] - s[1][n];
d[0][n] = s[0][n] * v0;
d[1][n] = s[1][n] * v1;
d[0][n] = (s[0][n] - w) * v0;
d[1][n] = (s[1][n] - w) * v1;
d[3][n] = c;
d[4][n] = s[0][n] * v4;
d[5][n] = s[1][n] * v5;