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audioconvert: add optional hilbert transform to rear channels

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Add an option to do a hilbert transform on the generated rear channels
to do a 90 degree pahse shift on them. This can improve spacialization
of the rear channels.

See #861
This commit is contained in:
Wim Taymans 2021-03-09 21:07:37 +01:00
parent 5dd0a12875
commit 5b3388e4ac
9 changed files with 121 additions and 17 deletions
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13
spa/plugins/audioconvert/channelmix-ops.c
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@ -35,6 +35,7 @@
#define VOLUME_NORM 1.0f
#include "channelmix-ops.h"
#include "hilbert.h"
#undef SPA_LOG_TOPIC_DEFAULT
#define SPA_LOG_TOPIC_DEFAULT log_topic
@ -469,6 +470,7 @@ done:
for (j = 0; j < jc; j++)
mix->matrix_orig[i][j] /= maxsum;
}
return 0;
}
@ -550,7 +552,16 @@ int channelmix_init(struct channelmix *mix)
mix->cpu_flags = info->cpu_flags;
mix->delay = mix->rear_delay * mix->freq / 1000.0f;
spa_log_debug(mix->log, "selected %s delay:%d", info->name, mix->delay);
spa_log_debug(mix->log, "selected %s delay:%d options:%08x", info->name, mix->delay,
mix->options);
if (mix->hilbert_taps > 0) {
mix->n_taps = SPA_CLAMP(mix->hilbert_taps, 15, 255) | 1;
blackman_window(mix->taps, mix->n_taps);
hilbert_generate(mix->taps, mix->n_taps);
} else {
mix->n_taps = 1;
mix->taps[0] = 1.0f;
}
return make_matrix(mix);
}