libcm is a C development framework with an emphasis on audio signal processing applications.
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cmApBuf.h 11KB

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  1. //( {file_desc: "Thread safe audio buffer class." kw:[rt audio]}
  2. //
  3. // This file defines an audio buffer class which handles
  4. // buffering incoming (recording) and outgoing (playback)
  5. // samples in a thread-safe manner.
  6. //
  7. // Usage example and testing code:
  8. // See cmApBufTest() and cmAudioSysTest().
  9. // \snippet cmApBuf.c cmApBufExample
  10. //
  11. // Notes on channel flags:
  12. // Disabled channels: kChFl is cleared
  13. // cmApBufGet()
  14. // in - return NULL buffer pointers
  15. // out - return NULL buffer points
  16. //
  17. // cmApBufUpdate()
  18. // in - incoming samples are set to 0.
  19. // out - outgoing samples are set to 0.
  20. //
  21. // Muted channels: kMuteFl is set
  22. // cmApBufUpdate()
  23. // in - incoming samples are set to 0.
  24. // out - outgoing samples are set to 0.
  25. //
  26. // Tone channels: kToneFl is set
  27. // cmApBufUpdate()
  28. // in - incoming samples are filled with a 1k sine tone
  29. // out - outgoing samples are filled with a 1k sine tone
  30. //)
  31. #ifndef cmApBuf_h
  32. #define cmApBuf_h
  33. #ifdef __cplusplus
  34. extern "C" {
  35. #endif
  36. //(
  37. typedef cmRC_t cmAbRC_t; //< Result code type
  38. enum
  39. {
  40. kOkAbRC = 0
  41. };
  42. // Allocate and initialize an audio buffer.
  43. // devCnt - count of devices this buffer will handle.
  44. // meterMs - length of the meter buffers in milliseconds (automatically limit to the range:10 to 1000)
  45. cmAbRC_t cmApBufInitialize( unsigned devCnt, unsigned meterMs );
  46. // Deallocate and release any resource held by an audio buffer allocated via cmApBufInitialize().
  47. cmAbRC_t cmApBufFinalize();
  48. // Configure a buffer for a given device.
  49. cmAbRC_t cmApBufSetup(
  50. unsigned devIdx, //< device to setup
  51. double srate, //< device sample rate (only required for synthesizing the correct test-tone frequency)
  52. unsigned dspFrameCnt, // dspFrameCnt - count of samples in channel buffers returned via cmApBufGet()
  53. unsigned cycleCnt, //< number of audio port cycles to store
  54. unsigned inChCnt, //< input channel count on this device
  55. unsigned inFramesPerCycle, //< maximum number of incoming sample frames on an audio port cycle
  56. unsigned outChCnt, //< output channel count on this device
  57. unsigned outFramesPerCycle //< maximum number of outgoing sample frames in an audio port cycle
  58. );
  59. // Prime the buffer with 'audioCycleCnt' * outFramesPerCycle samples ready to be played
  60. cmAbRC_t cmApBufPrimeOutput( unsigned devIdx, unsigned audioCycleCnt );
  61. // Notify the audio buffer that a device is being enabled or disabled.
  62. void cmApBufOnPortEnable( unsigned devIdx, bool enabelFl );
  63. // This function is called asynchronously by the audio device driver to transfer incoming samples to the
  64. // the buffer and to send outgoing samples to the DAC. This function is
  65. // intended to be called from the audio port callback function (\see cmApCallbackPtr_t).
  66. // This function is thread-safe under the condition where the audio device uses
  67. // different threads for input and output.
  68. //
  69. // Enable Flag:
  70. // Input: If an input channel is disabled then the incoming samples are replaced with zeros.
  71. // Output: If an output channel is disabled then the packet samples are set to zeros.
  72. //
  73. // Tone Flag:
  74. // Input: If the tone flag is set on an input channel then the incoming samples are set to a sine tone.
  75. // Output: If the tone flag is set on an output channel then the packet samples are set to a sine tone.
  76. //
  77. // The enable flag has higher precedence than the tone flag therefore disabled channels
  78. // will be set to zero even if the tone flag is set.
  79. cmAbRC_t cmApBufUpdate(
  80. cmApAudioPacket_t* inPktArray, //< full audio packets from incoming audio (from ADC)
  81. unsigned inPktCnt, //< count of incoming audio packets
  82. cmApAudioPacket_t* outPktArray, //< empty audio packet for outgoing audio (to DAC)
  83. unsigned outPktCnt //< count of outgoing audio packets
  84. );
  85. // Channel flags
  86. enum
  87. {
  88. kInApFl = 0x01, //< Identify an input channel
  89. kOutApFl = 0x02, //< Identify an output channel
  90. kEnableApFl = 0x04, //< Set to enable a channel, Clear to disable.
  91. kChApFl = 0x08, //< Used to enable/disable a channel
  92. kMuteApFl = 0x10, //< Mute this channel
  93. kToneApFl = 0x20, //< Generate a tone on this channel
  94. kMeterApFl = 0x40, //< Turn meter's on/off
  95. kPassApFl = 0x80 //< Pass input channels throught to the output. Must use cmApBufGetIO() to implement this functionality.
  96. };
  97. // Return the meter window period as set by cmApBufInitialize()
  98. unsigned cmApBufMeterMs();
  99. // Set the meter update period. THis function limits the value to between 10 and 1000.
  100. void cmApBufSetMeterMs( unsigned meterMs );
  101. // Returns the channel count set via cmApBufSetup().
  102. unsigned cmApBufChannelCount( unsigned devIdx, unsigned flags );
  103. // Set chIdx to -1 to enable all channels on this device.
  104. // Set flags to {kInApFl | kOutApFl} | {kChApFl | kToneApFl | kMeterFl} | { kEnableApFl=on | 0=off }
  105. void cmApBufSetFlag( unsigned devIdx, unsigned chIdx, unsigned flags );
  106. // Return true if the the flags is set.
  107. bool cmApBufIsFlag( unsigned devIdx, unsigned chIdx, unsigned flags );
  108. // Set chIdx to -1 to enable all channels on this device.
  109. void cmApBufEnableChannel( unsigned devIdx, unsigned chIdx, unsigned flags );
  110. // Returns true if an input/output channel is enabled on the specified device.
  111. bool cmApBufIsChannelEnabled(unsigned devIdx, unsigned chIdx, unsigned flags );
  112. // Set the state of the tone generator on the specified channel.
  113. // Set chIdx to -1 to apply the change to all channels on this device.
  114. // Set flags to {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
  115. void cmApBufEnableTone( unsigned devIdx, unsigned chIdx, unsigned flags );
  116. // Returns true if an input/output tone is enabled on the specified device.
  117. bool cmApBufIsToneEnabled(unsigned devIdx, unsigned chIdx, unsigned flags );
  118. // Mute a specified channel.
  119. // Set chIdx to -1 to apply the change to all channels on this device.
  120. // Set flags to {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
  121. void cmApBufEnableMute( unsigned devIdx, unsigned chIdx, unsigned flags );
  122. // Returns true if an input/output channel is muted on the specified device.
  123. bool cmApBufIsMuteEnabled(unsigned devIdx, unsigned chIdx, unsigned flags );
  124. // Set the specified channel to pass through.
  125. // Set chIdx to -1 to apply the change to all channels on this device.
  126. // Set flags to {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
  127. void cmApBufEnablePass( unsigned devIdx, unsigned chIdx, unsigned flags );
  128. // Returns true if pass through is enabled on the specified channel.
  129. bool cmApBufIsPassEnabled(unsigned devIdx, unsigned chIdx, unsigned flags );
  130. // Turn meter data collection on and off.
  131. // Set chIdx to -1 to apply the change to all channels on this device.
  132. // Set flags to {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
  133. void cmApBufEnableMeter( unsigned devIdx, unsigned chIdx, unsigned flags );
  134. // Returns true if an input/output tone is enabled on the specified device.
  135. bool cmApBufIsMeterEnabled(unsigned devIdx, unsigned chIdx, unsigned flags );
  136. // Return the meter value for the requested channel.
  137. // Set flags to kInApFl | kOutApFl.
  138. cmApSample_t cmApBufMeter(unsigned devIdx, unsigned chIdx, unsigned flags );
  139. // Set chIdx to -1 to apply the gain to all channels on the specified device.
  140. void cmApBufSetGain( unsigned devIdx, unsigned chIdx, unsigned flags, double gain );
  141. // Return the current gain seting for the specified channel.
  142. double cmApBufGain( unsigned devIdx, unsigned chIdx, unsigned flags );
  143. // Get the meter and fault status of the channel input or output channel array of a device.
  144. // Set 'flags' to { kInApFl | kOutApFl }.
  145. // The returns value is the count of channels actually written to meterArray.
  146. // If 'faultCntPtr' is non-NULL then it is set to the faultCnt of the associated devices input or output buffer.
  147. unsigned cmApBufGetStatus( unsigned devIdx, unsigned flags, double* meterArray, unsigned meterCnt, unsigned* faultCntPtr );
  148. // Do all enabled input/output channels on this device have samples available?
  149. // 'flags' can be set to either or both kInApFl and kOutApFl
  150. bool cmApBufIsDeviceReady( unsigned devIdx, unsigned flags );
  151. // This function is called by the application to get full incoming sample buffers and
  152. // to fill empty outgoing sample buffers.
  153. // Upon return each element in bufArray[bufChCnt] holds a pointer to a buffer assoicated
  154. // with an audio channel or to NULL if the channel is disabled.
  155. // 'flags' can be set to kInApFl or kOutApFl but not both.
  156. // The buffers pointed to by bufArray[] each contain 'dspFrameCnt' samples. Where
  157. // 'dspFrameCnt' was set in the earlier call to cmApBufSetup() for this device.
  158. // (see cmApBufInitialize()).
  159. // Note that this function just returns audio information it does not
  160. // change any cmApBuf() internal states.
  161. void cmApBufGet( unsigned devIdx, unsigned flags, cmApSample_t* bufArray[], unsigned bufChCnt );
  162. // This function replaces calls to cmApBufGet() and implements pass-through and output
  163. // buffer zeroing:
  164. //
  165. // 1) cmApBufGet(in);
  166. // 2) cmApBufGet(out);
  167. // 3) Copy through channels marked for 'pass' and set the associated oBufArray[i] channel to NULL.
  168. // 4) Zero all other enabled output channels.
  169. //
  170. // Notes:
  171. // 1) The oBufArray[] channels that are disabled or marked for pass-through will
  172. // be set to NULL.
  173. // 2) The client is required to use this function to implement pass-through internally.
  174. // 3) This function just returns audio information it does not
  175. // change any cmApBuf() internal states.
  176. // 4) The timestamp pointers are optional.
  177. void cmApBufGetIO( unsigned iDevIdx, cmApSample_t* iBufArray[], unsigned iBufChCnt, cmTimeSpec_t* iTimeStampPtr,
  178. unsigned oDevIdx, cmApSample_t* oBufArray[], unsigned oBufChCnt, cmTimeSpec_t* oTimeStampPtr );
  179. // The application calls this function each time it completes processing of a bufArray[]
  180. // returned from cmApBufGet(). 'flags' can be set to either or both kInApFl and kOutApFl.
  181. // This function should only be called from the client thread.
  182. void cmApBufAdvance( unsigned devIdx, unsigned flags );
  183. // Copy all available samples incoming samples from an input device to an output device.
  184. // The source code for this example is a good example of how an application should use cmApBufGet()
  185. // and cmApBufAdvance().
  186. void cmApBufInputToOutput( unsigned inDevIdx, unsigned outDevIdx );
  187. // Print the current buffer state.
  188. void cmApBufReport( cmRpt_t* rpt );
  189. // Run a buffer usage simulation to test the class. cmAudioPortTest.c calls this function.
  190. void cmApBufTest( cmRpt_t* rpt );
  191. //)
  192. #ifdef __cplusplus
  193. }
  194. #endif
  195. #endif