You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

127 satır
3.3KB

  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. #include "spi_interrupt.h"
  28. void AudioPlaySdRaw::begin(void)
  29. {
  30. playing = false;
  31. file_offset = 0;
  32. file_size = 0;
  33. }
  34. bool AudioPlaySdRaw::play(const char *filename)
  35. {
  36. stop();
  37. #if defined(HAS_KINETIS_SDHC)
  38. if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStartUsingSPI();
  39. #else
  40. AudioStartUsingSPI();
  41. #endif
  42. __disable_irq();
  43. rawfile = SD.open(filename);
  44. __enable_irq();
  45. if (!rawfile) {
  46. //Serial.println("unable to open file");
  47. #if defined(HAS_KINETIS_SDHC)
  48. if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStopUsingSPI();
  49. #else
  50. AudioStopUsingSPI();
  51. #endif
  52. return false;
  53. }
  54. file_size = rawfile.size();
  55. file_offset = 0;
  56. //Serial.println("able to open file");
  57. playing = true;
  58. return true;
  59. }
  60. void AudioPlaySdRaw::stop(void)
  61. {
  62. __disable_irq();
  63. if (playing) {
  64. playing = false;
  65. __enable_irq();
  66. rawfile.close();
  67. #if defined(HAS_KINETIS_SDHC)
  68. if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStopUsingSPI();
  69. #else
  70. AudioStopUsingSPI();
  71. #endif
  72. } else {
  73. __enable_irq();
  74. }
  75. }
  76. void AudioPlaySdRaw::update(void)
  77. {
  78. unsigned int i, n;
  79. audio_block_t *block;
  80. // only update if we're playing
  81. if (!playing) return;
  82. // allocate the audio blocks to transmit
  83. block = allocate();
  84. if (block == NULL) return;
  85. if (rawfile.available()) {
  86. // we can read more data from the file...
  87. n = rawfile.read(block->data, AUDIO_BLOCK_SAMPLES*2);
  88. file_offset += n;
  89. for (i=n/2; i < AUDIO_BLOCK_SAMPLES; i++) {
  90. block->data[i] = 0;
  91. }
  92. transmit(block);
  93. } else {
  94. rawfile.close();
  95. #if defined(HAS_KINETIS_SDHC)
  96. if (!(SIM_SCGC3 & SIM_SCGC3_SDHC)) AudioStopUsingSPI();
  97. #else
  98. AudioStopUsingSPI();
  99. #endif
  100. playing = false;
  101. }
  102. release(block);
  103. }
  104. #define B2M (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT / 2.0) // 97352592
  105. uint32_t AudioPlaySdRaw::positionMillis(void)
  106. {
  107. return ((uint64_t)file_offset * B2M) >> 32;
  108. }
  109. uint32_t AudioPlaySdRaw::lengthMillis(void)
  110. {
  111. return ((uint64_t)file_size * B2M) >> 32;
  112. }