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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. #include "play_sd_raw.h"
  27. void AudioPlaySdRaw::begin(void)
  28. {
  29. playing = false;
  30. if (block) {
  31. release(block);
  32. block = NULL;
  33. }
  34. file_offset = 0;
  35. file_size = 0;
  36. }
  37. bool AudioPlaySdRaw::play(const char *filename)
  38. {
  39. stop();
  40. rawfile = SD.open(filename);
  41. if (!rawfile) {
  42. //Serial.println("unable to open file");
  43. return false;
  44. }
  45. file_size = rawfile.size();
  46. file_offset = 0;
  47. //Serial.println("able to open file");
  48. playing = true;
  49. return true;
  50. }
  51. void AudioPlaySdRaw::stop(void)
  52. {
  53. __disable_irq();
  54. if (playing) {
  55. playing = false;
  56. __enable_irq();
  57. rawfile.close();
  58. } else {
  59. __enable_irq();
  60. }
  61. }
  62. void AudioPlaySdRaw::update(void)
  63. {
  64. unsigned int i, n;
  65. // only update if we're playing
  66. if (!playing) return;
  67. // allocate the audio blocks to transmit
  68. block = allocate();
  69. if (block == NULL) return;
  70. if (rawfile.available()) {
  71. // we can read more data from the file...
  72. n = rawfile.read(block->data, AUDIO_BLOCK_SAMPLES*2);
  73. file_offset += n;
  74. for (i=n/2; i < AUDIO_BLOCK_SAMPLES; i++) {
  75. block->data[i] = 0;
  76. }
  77. transmit(block);
  78. release(block);
  79. } else {
  80. rawfile.close();
  81. playing = false;
  82. }
  83. }
  84. #define B2M (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT / 2.0) // 97352592
  85. uint32_t AudioPlaySdRaw::positionMillis(void)
  86. {
  87. return ((uint64_t)file_offset * B2M) >> 32;
  88. }
  89. uint32_t AudioPlaySdRaw::lengthMillis(void)
  90. {
  91. return ((uint64_t)file_size * B2M) >> 32;
  92. }