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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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2
spa/plugins/audioconvert/channelmix-ops.c
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@ -429,6 +429,8 @@ done:
continue;
mix->matrix_orig[ic][jc++] = matrix[i][j];
sum += fabs(matrix[i][j]);
if (i == LFE)
lr4_set(&mix->lr4[ic], BQ_LOWPASS, mix->lfe_cutoff / mix->freq);
}
maxsum = SPA_MAX(maxsum, sum);
ic++;