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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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3
spa/plugins/audioconvert/channelmix-ops.h
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@ -28,6 +28,8 @@
#include <spa/utils/defs.h>
#include <spa/param/audio/raw.h>
#include "crossover.h"
#define VOLUME_MIN 0.0f
#define VOLUME_NORM 1.0f
@ -63,6 +65,7 @@ struct channelmix {
float freq; /* sample frequency */
float lfe_cutoff; /* in Hz, 0 is disabled */
struct lr4 lr4[SPA_AUDIO_MAX_CHANNELS];
void (*process) (struct channelmix *mix, uint32_t n_dst, void * SPA_RESTRICT dst[n_dst],
uint32_t n_src, const void * SPA_RESTRICT src[n_src], uint32_t n_samples);