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teensy-audio/effect_granular.h

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  1. /*

  2.  * Copyright (c) 2018 John-Michael Reed

  3.  * bleeplabs.com

  4.  *

  5.  * Permission is hereby granted, free of charge, to any person obtaining a copy

  6.  * of this software and associated documentation files (the "Software"), to deal

  7.  * in the Software without restriction, including without limitation the rights

  8.  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  9.  * copies of the Software, and to permit persons to whom the Software is

  10.  * furnished to do so, subject to the following conditions:

  11.  *

  12.  * The above copyright notice and this permission notice shall be included in all

  13.  * copies or substantial portions of the Software.

  14.  *

  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  18.  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  20.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

  21.  * SOFTWARE.

  22.  */

  23. 

  24. #include "AudioStream.h"

  25. 

  26. class AudioEffectGranular : public AudioStream

  27. {

  28. public:

  29. 	AudioEffectGranular(void): AudioStream(1,inputQueueArray) { }

  30. 	void begin(int16_t *sample_bank_def, int16_t max_len_def);

  31. 	void setSpeed(float ratio) {

  32. 		if (ratio < 0.125) ratio = 0.125;

  33. 		else if (ratio > 8.0) ratio = 8.0;

  34. 		playpack_rate = ratio * 65536.0 + 0.499;

  35. 	}

  36. 	void beginFreeze(float grain_length) {

  37. 		if (grain_length <= 0.0) return;

  38. 		beginFreeze_int(grain_length * (AUDIO_SAMPLE_RATE_EXACT * 0.001) + 0.5);

  39. 	}

  40. 	void beginPitchShift(float grain_length) {

  41. 		if (grain_length <= 0.0) return;

  42. 		beginPitchShift_int(grain_length * (AUDIO_SAMPLE_RATE_EXACT * 0.001) + 0.5);

  43. 	}

  44. 	void stop();

  45. 	virtual void update(void);

  46. private:

  47. 	void beginFreeze_int(int grain_samples);

  48. 	void beginPitchShift_int(int grain_samples);

  49. 	audio_block_t *inputQueueArray[1];

  50. 	int16_t *sample_bank;

  51. 	uint32_t playpack_rate;

  52. 	uint32_t accumulator;

  53. 	int16_t max_sample_len;

  54. 	int16_t write_head;

  55. 	int16_t read_head;

  56. 	int16_t grain_mode;

  57. 	int16_t freeze_len;

  58. 	int16_t prev_input;

  59. 	int16_t glitch_len;

  60. 	bool allow_len_change;

  61. 	bool sample_loaded;

  62. 	bool write_en;

  63. 	bool sample_req;

  64. };