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audioconvert: add LFE filter

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Use a lowpass filter to generate LFE from the stereo channels.
This commit is contained in:
Wim Taymans 2021-03-09 17:23:43 +01:00
parent e51cc5b537
commit 14e8073d18
8 changed files with 261 additions and 0 deletions
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8
spa/plugins/audioconvert/channelmix-ops-c.c
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@ -252,6 +252,8 @@ channelmix_f32_2_3p1_c(struct channelmix *mix, uint32_t n_dst, void * SPA_RESTRI
d[2][n] = c * v2;
d[3][n] = c * v3;
}
if (v3 > 0.0f)
lr4_process(&mix->lr4[3], d[3], n_samples);
}
else {
for (n = 0; n < n_samples; n++) {
@ -261,6 +263,8 @@ channelmix_f32_2_3p1_c(struct channelmix *mix, uint32_t n_dst, void * SPA_RESTRI
d[2][n] = c * v2;
d[3][n] = c * v3;
}
if (v3 > 0.0f)
lr4_process(&mix->lr4[3], d[3], n_samples);
}
}
@ -291,6 +295,8 @@ channelmix_f32_2_5p1_c(struct channelmix *mix, uint32_t n_dst, void * SPA_RESTRI
d[2][n] = c * v2;
d[3][n] = c * v3;
}
if (v3 > 0.0f)
lr4_process(&mix->lr4[3], d[3], n_samples);
}
else {
for (n = 0; n < n_samples; n++) {
@ -302,6 +308,8 @@ channelmix_f32_2_5p1_c(struct channelmix *mix, uint32_t n_dst, void * SPA_RESTRI
d[4][n] = s[0][n] * v4;
d[5][n] = s[1][n] * v5;
}
if (v3 > 0.0f)
lr4_process(&mix->lr4[3], d[3], n_samples);
}
}