PlatformIO package of the Teensy core framework compatible with GCC 10 & C++20
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  1. /* Audio Library for Teensy 3.X
  2. * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
  3. *
  4. * Development of this audio library was funded by PJRC.COM, LLC by sales of
  5. * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
  6. * open source software by purchasing Teensy or other PJRC products.
  7. *
  8. * Permission is hereby granted, free of charge, to any person obtaining a copy
  9. * of this software and associated documentation files (the "Software"), to deal
  10. * in the Software without restriction, including without limitation the rights
  11. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12. * copies of the Software, and to permit persons to whom the Software is
  13. * furnished to do so, subject to the following conditions:
  14. *
  15. * The above copyright notice, development funding notice, and this permission
  16. * notice shall be included in all copies or substantial portions of the Software.
  17. *
  18. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24. * THE SOFTWARE.
  25. */
  26. #ifndef mixer_h_
  27. #define mixer_h_
  28. #include "Arduino.h"
  29. #include "AudioStream.h"
  30. class AudioMixer4 : public AudioStream
  31. {
  32. #if defined(__ARM_ARCH_7EM__)
  33. public:
  34. AudioMixer4(void) : AudioStream(4, inputQueueArray) {
  35. for (int i=0; i<4; i++) multiplier[i] = 65536;
  36. }
  37. virtual void update(void);
  38. void gain(unsigned int channel, float gain) {
  39. if (channel >= 4) return;
  40. if (gain > 32767.0f) gain = 32767.0f;
  41. else if (gain < -32767.0f) gain = -32767.0f;
  42. multiplier[channel] = gain * 65536.0f; // TODO: proper roundoff?
  43. }
  44. private:
  45. int32_t multiplier[4];
  46. audio_block_t *inputQueueArray[4];
  47. #elif defined(KINETISL)
  48. public:
  49. AudioMixer4(void) : AudioStream(4, inputQueueArray) {
  50. for (int i=0; i<4; i++) multiplier[i] = 256;
  51. }
  52. virtual void update(void);
  53. void gain(unsigned int channel, float gain) {
  54. if (channel >= 4) return;
  55. if (gain > 127.0f) gain = 127.0f;
  56. else if (gain < -127.0f) gain = -127.0f;
  57. multiplier[channel] = gain * 256.0f; // TODO: proper roundoff?
  58. }
  59. private:
  60. int16_t multiplier[4];
  61. audio_block_t *inputQueueArray[4];
  62. #endif
  63. };
  64. class AudioAmplifier : public AudioStream
  65. {
  66. public:
  67. AudioAmplifier(void) : AudioStream(1, inputQueueArray), multiplier(65536) {
  68. }
  69. virtual void update(void);
  70. void gain(float n) {
  71. if (n > 32767.0f) n = 32767.0f;
  72. else if (n < -32767.0f) n = -32767.0f;
  73. multiplier = n * 65536.0f;
  74. }
  75. private:
  76. int32_t multiplier;
  77. audio_block_t *inputQueueArray[1];
  78. };
  79. #endif