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channelmix: add option to filter FC

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Add an option to do a lowpass filter on the FC channel to isolate
the voices better and move the higher frequencies to the stereo
channels.

See #861
This commit is contained in:
Wim Taymans 2022-03-01 11:30:12 +01:00
parent 5b3388e4ac
commit 23db50630d
7 changed files with 26 additions and 4 deletions
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7
spa/plugins/audioconvert/channelmix-ops.c
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@ -456,8 +456,11 @@ done:
}
maxsum = SPA_MAX(maxsum, sum);
if (i == _CH(LFE) && mix->lfe_cutoff > 0.0f) {
spa_log_debug(mix->log, "channel %d is LFE", ic);
spa_log_debug(mix->log, "channel %d is LFE cutoff:%f", ic, mix->lfe_cutoff);
lr4_set(&mix->lr4[ic], BQ_LOWPASS, mix->lfe_cutoff / mix->freq);
} else if (i == _CH(FC) && mix->fc_cutoff > 0.0f) {
spa_log_debug(mix->log, "channel %d is FC cutoff:%f", ic, mix->fc_cutoff);
lr4_set(&mix->lr4[ic], BQ_LOWPASS, mix->fc_cutoff / mix->freq);
} else {
mix->lr4[ic].active = false;
}
@ -556,7 +559,7 @@ int channelmix_init(struct channelmix *mix)
mix->options);
if (mix->hilbert_taps > 0) {
mix->n_taps = SPA_CLAMP(mix->hilbert_taps, 15, 255) | 1;
mix->n_taps = SPA_CLAMP(mix->hilbert_taps, 15u, 255u) | 1;
blackman_window(mix->taps, mix->n_taps);
hilbert_generate(mix->taps, mix->n_taps);
} else {