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@ -46,6 +46,8 @@ boolean AudioEffectModulatedDelay::begin(short *delayline, int d_length) |
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_delayline = NULL; |
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_delayline = NULL; |
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_delay_length = 0; |
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_delay_length = 0; |
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_delay_offset = 0.0; |
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_modulation_intensity = 0.0; |
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_circ_idx = 0; |
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_circ_idx = 0; |
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if (delayline == NULL) { |
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if (delayline == NULL) { |
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@ -56,7 +58,13 @@ boolean AudioEffectModulatedDelay::begin(short *delayline, int d_length) |
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} |
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} |
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_delayline = delayline; |
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_delayline = delayline; |
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_delay_length = _max_delay_length = d_length; |
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_delay_length = d_length; |
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#ifdef CHORUS_INTERPOLATION_MODE |
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spline = new Spline; |
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spline->setPoints(x, y, int(CHORUS_INTERPOLATION_WINDOW_SIZE)); |
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spline->setDegree(CHORUS_INTERPOLATION_MODE); |
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#endif |
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return (true); |
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return (true); |
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} |
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} |
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@ -81,9 +89,7 @@ void AudioEffectModulatedDelay::update(void) |
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float mod_fraction; |
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float mod_fraction; |
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#ifdef CHORUS_INTERPOLATION_MODE |
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#ifdef CHORUS_INTERPOLATION_MODE |
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int8_t j; |
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int8_t j; |
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float x[CHORUS_INTERPOLATION_WINDOW_SIZE]; |
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uint8_t c; |
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float y[CHORUS_INTERPOLATION_WINDOW_SIZE]; |
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Spline spline(x, y, CHORUS_INTERPOLATION_WINDOW_SIZE, CHORUS_INTERPOLATION_MODE); |
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#endif |
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#endif |
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bp = block->data; |
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bp = block->data; |
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@ -96,16 +102,15 @@ void AudioEffectModulatedDelay::update(void) |
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_circ_idx = 0; |
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_circ_idx = 0; |
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_delayline[_circ_idx] = *bp; |
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_delayline[_circ_idx] = *bp; |
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// Calculate modulation index as a float, for interpolation later.
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// Calculate the modulation index as a float in the interval [-1.0,1.0] for interpolation later.
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// The index is located around the half of the delay length multiplied by the current amount of the modulator
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// The index is located around the half of the delay length multiplied by the current amount of the modulator
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mod_idx = *mp * float(_delay_length >> 1); |
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mod_idx = _delay_offset + ((float(*mp) / SHRT_MAX) * _modulation_intensity); |
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mod_fraction = modff(mod_idx, &mod_number); |
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mod_fraction = modff(mod_idx, &mod_number); |
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#ifdef CHORUS_INTERPOLATION_MODE |
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#ifdef CHORUS_INTERPOLATION_MODE |
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// Spline interpolation
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// Spline interpolation
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// Generate a an array with the size of CHORUS_INTERPOLATION_WINDOW_SIZE of x/y values around mod_idx for interpolation
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// Generate a an array with the size of CHORUS_INTERPOLATION_WINDOW_SIZE of x/y values around mod_idx for interpolation
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uint8_t c = 0; |
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int16_t c_mod_idx = _circ_idx - int(round(mod_idx)); // This is the pointer to the value in the circular buffer at the current modulation index
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int16_t c_mod_idx = _circ_idx - int(round(mod_idx)); // This is the pointer to the value in the circular buffer at the current modulation index
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for (j = (CHORUS_INTERPOLATION_WINDOW_SIZE / -2); j <= (CHORUS_INTERPOLATION_WINDOW_SIZE / 2); j++) |
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for (j = (CHORUS_INTERPOLATION_WINDOW_SIZE / -2), c = 0; j <= (CHORUS_INTERPOLATION_WINDOW_SIZE / 2); j++, c++) |
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{ |
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{ |
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int16_t jc_mod_idx = (c_mod_idx + j) % _delay_length; // The modulation index pointer plus the value of the current window pointer
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int16_t jc_mod_idx = (c_mod_idx + j) % _delay_length; // The modulation index pointer plus the value of the current window pointer
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if (jc_mod_idx < 0) // check for negative offsets and correct them
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if (jc_mod_idx < 0) // check for negative offsets and correct them
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@ -113,9 +118,8 @@ void AudioEffectModulatedDelay::update(void) |
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else |
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else |
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y[c] = float(_delayline[jc_mod_idx]); |
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y[c] = float(_delayline[jc_mod_idx]); |
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x[c] = float(j); |
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x[c] = float(j); |
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c++; |
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} |
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} |
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*bp = int(round(spline.value(mod_fraction))); // use spline interpolated value
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*bp = int(round(spline->value(mod_fraction))); // use spline interpolated value
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#else |
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#else |
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// Simple interpolation
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// Simple interpolation
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int16_t c_mod_idx = (_circ_idx + int(round(mod_idx))) % _delay_length; |
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int16_t c_mod_idx = (_circ_idx + int(round(mod_idx))) % _delay_length; |
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@ -131,7 +135,12 @@ void AudioEffectModulatedDelay::update(void) |
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value1 = _delayline[c_mod_idx - 1]; |
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value1 = _delayline[c_mod_idx - 1]; |
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value2 = _delayline[c_mod_idx]; |
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value2 = _delayline[c_mod_idx]; |
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} |
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} |
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*bp = int(round(mod_fraction * value1 + (1.0 - mod_fraction) * value2)); |
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if (mod_fraction < 0) |
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*bp = int(round((1.0 + mod_fraction) * value1 + fabs(mod_fraction) * value2)); |
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else |
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*bp = int(round(mod_fraction * value1 + (1.0 - mod_fraction) * value2)); |
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#endif |
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#endif |
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bp++; // next audio data
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bp++; // next audio data
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mp++; // next modulation data
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mp++; // next modulation data
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@ -149,7 +158,25 @@ void AudioEffectModulatedDelay::update(void) |
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} |
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} |
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} |
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} |
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void AudioEffectModulatedDelay::setDelay(float milliseconds) |
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float AudioEffectModulatedDelay::offset(float offset_value) |
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{ |
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{ |
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_delay_length = min(AUDIO_SAMPLE_RATE * milliseconds / 500, _max_delay_length); |
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uint16_t offset_frames = (offset_value / 1000) * AUDIO_SAMPLE_RATE; |
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if (offset_frames > _delay_length * MODULATION_MAX_FACTOR) |
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_delay_offset = _delay_length * MODULATION_MAX_FACTOR; |
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else if (offset_frames <= _delay_length * (1 - MODULATION_MAX_FACTOR)) |
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_delay_offset = _delay_length * (1 - MODULATION_MAX_FACTOR); |
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else |
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_delay_offset = offset_frames; |
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return (offset_frames / AUDIO_SAMPLE_RATE * 1000); |
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} |
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void AudioEffectModulatedDelay::intensity(float intensity_value) |
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{ |
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if (intensity_value > 1.0) |
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intensity_value = 1.0; |
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else if (intensity_value < 0.0) |
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intensity_value = 0.0; |
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_modulation_intensity = intensity_value * (1 - MODULATION_MAX_FACTOR) * 2 * _delay_length; |
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} |
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} |
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