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audioconvert: use the same biquad as filter-chain

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This commit is contained in:
Wim Taymans 2024-11-27 16:47:53 +01:00
parent 98365470c7
commit 0a0b1d594b
4 changed files with 338 additions and 68 deletions
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28
spa/plugins/audioconvert/biquad.h
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@ -10,6 +10,20 @@
extern "C" {
#endif
/* The type of the biquad filters */
enum biquad_type {
BQ_NONE,
BQ_LOWPASS,
BQ_HIGHPASS,
BQ_BANDPASS,
BQ_LOWSHELF,
BQ_HIGHSHELF,
BQ_PEAKING,
BQ_NOTCH,
BQ_ALLPASS,
BQ_RAW,
};
/* The biquad filter parameters. The transfer function H(z) is (b0 + b1 * z^(-1)
* + b2 * z^(-2)) / (1 + a1 * z^(-1) + a2 * z^(-2)). The previous two inputs
* are stored in x1 and x2, and the previous two outputs are stored in y1 and
@ -19,15 +33,10 @@ extern "C" {
* float is used during the actual filtering for faster computation.
*/
struct biquad {
enum biquad_type type;
float b0, b1, b2;
float a1, a2;
};
/* The type of the biquad filters */
enum biquad_type {
BQ_NONE,
BQ_LOWPASS,
BQ_HIGHPASS,
float x1, x2;
};
/* Initialize a biquad filter parameters from its type and parameters.
@ -36,8 +45,11 @@ enum biquad_type {
* type - The type of the biquad filter.
* frequency - The value should be in the range [0, 1]. It is relative to
* half of the sampling rate.
* Q - Quality factor. See Web Audio API for details.
* gain - The value is in dB. See Web Audio API for details.
*/
void biquad_set(struct biquad *bq, enum biquad_type type, double freq);
void biquad_set(struct biquad *bq, enum biquad_type type, double freq, double Q,
double gain);
#ifdef __cplusplus
} /* extern "C" */