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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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6
spa/plugins/audioconvert/channelmix-ops.h
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@ -48,6 +48,9 @@ extern struct spa_log_topic *log_topic;
#define BUFFER_SIZE 4096
#define BUFFER_SIZE 4096
#define MAX_TAPS 255
struct channelmix {
uint32_t src_chan;
uint32_t dst_chan;
@ -73,11 +76,14 @@ struct channelmix {
float lfe_cutoff; /* in Hz, 0 is disabled */
float rear_delay; /* in ms, 0 is disabled */
float widen; /* stereo widen. 0 is disabled */
uint32_t hilbert_taps; /* to phase shift, 0 disabled */
struct lr4 lr4[SPA_AUDIO_MAX_CHANNELS];
float buffer[2][BUFFER_SIZE];
uint32_t pos[2];
uint32_t delay;
float taps[MAX_TAPS];
uint32_t n_taps;
void (*process) (struct channelmix *mix, void * SPA_RESTRICT dst[],
const void * SPA_RESTRICT src[], uint32_t n_samples);