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-
-
- #ifndef effect_reverb_
- #define effect_reverb_
-
- #include "AudioStream.h"
-
- #define APF1_BUF_LEN 600
- #define APF2_BUF_LEN 1300
- #define APF3_BUF_LEN 500
-
- #define LPF1_BUF_LEN 1400
- #define LPF2_BUF_LEN 1700
- #define LPF3_BUF_LEN 1800
- #define LPF4_BUF_LEN 2000
-
- #define APF1_DLY_LEN 586
- #define APF2_DLY_LEN 1239
- #define APF3_DLY_LEN 485
-
- #define LPF1_DLY_LEN 1398
- #define LPF2_DLY_LEN 1637
- #define LPF3_DLY_LEN 1774
- #define LPF4_DLY_LEN 1947
-
- #define LPF1_DLY_SEC 0.03171
- #define LPF2_DLY_SEC 0.03711
- #define LPF3_DLY_SEC 0.04023
- #define LPF4_DLY_SEC 0.04414
-
-
- class AudioEffectReverb : public AudioStream
- {
- public:
- AudioEffectReverb(void) : AudioStream(1, inputQueueArray) {
- init_comb_filters();
- clear_buffers();
- reverbTime(5.0);
- }
- virtual void update(void);
- void reverbTime(float);
-
- private:
- struct comb_apf {
- int32_t g;
- int32_t *buffer;
- uint32_t buf_len;
- uint32_t delay, rd_idx, wr_idx;
- };
-
- struct comb_lpf {
- int32_t g1, g2, z1;
- int32_t *buffer;
- uint32_t buf_len;
- uint32_t delay, rd_idx, wr_idx;
- };
- void init_comb_filters(void);
- void clear_buffers(void);
- static void _do_comb_apf(struct comb_apf *apf, int32_t *in_buf, int32_t *out_buf);
- static void _do_comb_lpf(struct comb_lpf *lpf, int32_t *in_buf, int32_t *out_buf);
-
- audio_block_t *inputQueueArray[1];
-
- struct comb_apf apf[3];
- struct comb_lpf lpf[4];
-
- float reverb_time_sec;
-
- float g_flt_apf[3];
- int32_t g_q31_apf[3];
-
- float g1_flt_lpf[4];
- int32_t g1_q31_lpf[4];
-
- float g2_flt_lpf;
- int32_t g2_q31_lpf;
-
- int32_t apf1_buf[APF1_BUF_LEN];
- int32_t apf2_buf[APF2_BUF_LEN];
- int32_t apf3_buf[APF3_BUF_LEN];
-
- int32_t lpf1_buf[LPF1_BUF_LEN];
- int32_t lpf2_buf[LPF2_BUF_LEN];
- int32_t lpf3_buf[LPF3_BUF_LEN];
- int32_t lpf4_buf[LPF4_BUF_LEN];
-
- int32_t q31_buf[AUDIO_BLOCK_SAMPLES];
- int32_t sum_buf[AUDIO_BLOCK_SAMPLES];
- int32_t aux_buf[AUDIO_BLOCK_SAMPLES];
- };
-
- #endif
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