libcm is a C development framework with an emphasis on audio signal processing applications.
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cmMsgProtocol.c 3.8KB

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  1. #include "cmPrefix.h"
  2. #include "cmGlobal.h"
  3. #include "cmFloatTypes.h"
  4. #include "cmRpt.h"
  5. #include "cmErr.h"
  6. #include "cmCtx.h"
  7. #include "cmJson.h"
  8. #include "dsp/cmDspValue.h"
  9. #include "cmMsgProtocol.h"
  10. // buffer layout is:
  11. // [ cmDspUiHdr_t <data> ]
  12. // The format of the <data> is determiend by hdr.value.
  13. // Since hdr.value is the last field in the cmDspUiHdr_t record
  14. // the data follows this value.
  15. cmMsgRC_t cmMsgSend(
  16. cmErr_t* err,
  17. unsigned asSubIdx,
  18. unsigned msgTypeId,
  19. unsigned selId,
  20. unsigned flags,
  21. unsigned instId,
  22. unsigned instVarId,
  23. const cmDspValue_t* valPtr,
  24. cmMsgSendFuncPtr_t sendFunc,
  25. void* cbDataPtr )
  26. {
  27. unsigned bufByteCnt = sizeof(cmDspUiHdr_t);
  28. unsigned dataByteCnt = 0;
  29. if( valPtr != NULL )
  30. dataByteCnt = cmDsvSerialDataByteCount(valPtr);
  31. bufByteCnt += dataByteCnt;
  32. char buf[ bufByteCnt ];
  33. cmDspUiHdr_t* hdr = (cmDspUiHdr_t*)buf;
  34. hdr->asSubIdx = asSubIdx;
  35. hdr->uiId = msgTypeId; // see kXXXSelAsId identifiers in cmAudioSys.h
  36. hdr->selId = selId; // if msgTypeId==kUiSelAsId then see kXXXDuId in cmDspUi.h
  37. hdr->flags = flags;
  38. hdr->instId = instId;
  39. hdr->instVarId = instVarId;
  40. if( valPtr == NULL )
  41. cmDsvSetNull(&hdr->value);
  42. else
  43. {
  44. // this function relies on the 'hdr.value' field being the last field in the 'hdr'.
  45. if( cmDsvSerialize( valPtr, &hdr->value, sizeof(cmDspValue_t) + dataByteCnt) != kOkDsvRC )
  46. return cmErrMsg(err,kSerializeFailMsgRC,"An attempt to serialize a UI msg failed.");
  47. }
  48. const void* vp = buf;
  49. if( sendFunc(cbDataPtr,bufByteCnt,vp) != cmOkRC )
  50. return cmErrMsg(err,kSendFailMsgRC,"An attempt to transmit a msg to the host failed.");
  51. return kOkMsgRC;
  52. }
  53. // Return the unsigned value at the specified byte offset into the msg buffer.
  54. cmMsgRC_t _cmMsgPeekAtUInt( const void* msgArray[], unsigned msgByteCntArray[], unsigned segCnt, unsigned offset, unsigned* retValPtr )
  55. {
  56. unsigned i,j,k;
  57. for(k=0,i=0; i<segCnt; ++i)
  58. for(j=0; j<msgByteCntArray[i]; ++j,++k)
  59. if( k == offset )
  60. break;
  61. if( i == segCnt )
  62. return kDecodeFailMsgRC;
  63. *retValPtr = *((unsigned*)((char*)(msgArray[i]) + j));
  64. return kOkMsgRC;
  65. }
  66. cmMsgRC_t cmMsgPeekAsSubIndex( const void* msgArray[], unsigned msgByteCntArray[], unsigned segCnt, unsigned* retValPtr )
  67. {
  68. cmDspUiHdr_t h;
  69. unsigned offset = ((char*)(&h.asSubIdx)) - ((char*)&h);
  70. return _cmMsgPeekAtUInt(msgArray,msgByteCntArray,segCnt,offset,retValPtr);
  71. }
  72. cmMsgRC_t cmMsgPeekMsgTypeId( const void* msgArray[], unsigned msgByteCntArray[], unsigned segCnt, unsigned* retValPtr )
  73. {
  74. cmDspUiHdr_t h;
  75. unsigned offset = ((char*)(&h.uiId)) - ((char*)&h);
  76. return _cmMsgPeekAtUInt(msgArray,msgByteCntArray,segCnt,offset,retValPtr);
  77. }
  78. cmMsgRC_t cmMsgPeekSelId( const void* msgArray[], unsigned msgByteCntArray[], unsigned segCnt, unsigned* retValPtr )
  79. {
  80. cmDspUiHdr_t h;
  81. unsigned offset = ((char*)(&h.selId)) - ((char*)&h);
  82. return _cmMsgPeekAtUInt(msgArray,msgByteCntArray,segCnt,offset,retValPtr);
  83. }
  84. cmMsgRC_t cmMsgPeekFlags( const void* msgArray[], unsigned msgByteCntArray[], unsigned segCnt, unsigned* retValPtr )
  85. {
  86. cmDspUiHdr_t h;
  87. unsigned offset = ((char*)(&h.flags)) - ((char*)&h);
  88. return _cmMsgPeekAtUInt(msgArray,msgByteCntArray,segCnt,offset,retValPtr);
  89. }
  90. cmMsgRC_t cmMsgPeekInstId( const void* msgArray[], unsigned msgByteCntArray[], unsigned segCnt, unsigned* retValPtr )
  91. {
  92. cmDspUiHdr_t h;
  93. unsigned offset = ((char*)(&h.instId)) - ((char*)&h);
  94. return _cmMsgPeekAtUInt(msgArray,msgByteCntArray,segCnt,offset,retValPtr);
  95. }
  96. cmMsgRC_t cmMsgPeekInstVarId( const void* msgArray[], unsigned msgByteCntArray[], unsigned segCnt, unsigned* retValPtr )
  97. {
  98. cmDspUiHdr_t h;
  99. unsigned offset = ((char*)(&h.instVarId)) - ((char*)&h);
  100. return _cmMsgPeekAtUInt(msgArray,msgByteCntArray,segCnt,offset,retValPtr);
  101. }