libcm is a C development framework with an emphasis on audio signal processing applications.
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  1. #include "cmGlobal.h"
  2. #include "cmFloatTypes.h"
  3. #include "cmRpt.h"
  4. #include "cmErr.h"
  5. #include "cmCtx.h"
  6. #include "cmMem.h"
  7. #include "cmMallocDebug.h"
  8. #include "cmGr.h"
  9. #include "cmGrDevCtx.h"
  10. #include "cmGrPlot.h"
  11. #include "cmAudioFile.h"
  12. #include "cmAudioFileMgr.h"
  13. #include "cmGrPlotAudio.h"
  14. typedef struct
  15. {
  16. cmGrPlObjH_t oH;
  17. cmAfmFileH_t afH;
  18. unsigned chIdx;
  19. cmGrRenderObjCb_t renderCbFunc;
  20. void* renderCbArg;
  21. cmGrDestroyObjCb_t destroyCbFunc;
  22. void* destroyCbArg;
  23. cmGrIsInsideObjCb_t isInsideCbFunc;
  24. void* isInsideCbArg;
  25. void* mem; //
  26. cmGrPExt_t pext; // extents of the visible portion of this audio object
  27. unsigned pixN; // count of pixel columns used by this audio object
  28. cmSample_t* fMinV; // fMinV[pixN] = min sample value for each visible column
  29. cmSample_t* fMaxV; // fMaxV[pixN] = max sample value for each visible column
  30. int* iMinV; // iMinV[pixN] = top pixel for each column line
  31. int* iMaxV; // iMaxV[pixN] = bottom pixel for each column line
  32. } cmGrPlObjAf_t;
  33. cmGrPlRC_t _cmGrPlObjAfCalcImage( cmGrPlObjAf_t* op, cmGrH_t grH )
  34. {
  35. cmGrPlRC_t rc = kOkGrPlRC;
  36. cmGrObjH_t grObjH = cmGrPlotObjHandle(op->oH);
  37. cmGrVExt_t vwExt,objExt,drExt;
  38. // get the intersection of the view and this audio object
  39. cmGrViewExtents( grH, &vwExt );
  40. cmGrPlotObjVExt( op->oH, &objExt );
  41. cmGrVExtIntersect(&drExt,&vwExt,&objExt);
  42. // if the audio object is visible
  43. if( cmGrVExtIsNullOrEmpty(&drExt) )
  44. {
  45. cmGrPExtSetNull(&op->pext);
  46. op->pixN = 0;
  47. }
  48. else
  49. {
  50. // get the extents of the visible portion of the audio object
  51. cmGrVExt_VtoP( grH, cmGrPlotObjHandle(op->oH), &drExt, &op->pext);
  52. // store the count of horizontal pixels
  53. op->pixN = op->pext.sz.w;
  54. // allocate a cache to hold the image data
  55. unsigned byteCnt = op->pixN * 2 * sizeof(int) + op->pixN * 2 * sizeof(cmSample_t);
  56. op->mem = cmMemResize(char,op->mem,byteCnt);
  57. op->fMinV = (cmSample_t*)op->mem;
  58. op->fMaxV = op->fMinV + op->pixN;
  59. op->iMinV = (int*)(op->fMaxV + op->pixN);
  60. op->iMaxV = op->iMinV + op->pixN;
  61. assert( op->iMaxV + op->pixN == op->mem + byteCnt );
  62. // locate the offset into the file of the first sample to be displayed
  63. unsigned si = 0;
  64. if( drExt.loc.x > objExt.loc.x )
  65. si = drExt.loc.x - objExt.loc.x;
  66. // get the floating point audio summary signal
  67. if( cmAfmFileGetSummary( op->afH, op->chIdx, si, drExt.sz.w, op->fMinV, op->fMaxV, op->pixN ) != kOkAfmRC )
  68. {
  69. const cmChar_t* afn = cmAudioFileName( cmAfmFileHandle(op->afH));
  70. rc = cmErrMsg( cmGrPlotErr( cmGrPlotObjMgrHandle(op->oH) ), kRsrcFailGrPlRC, "Audio file summary read failure on '%s'.",afn);
  71. goto errLabel;
  72. }
  73. unsigned i;
  74. // convert the summary to pixels values
  75. for(i=0; i<op->pixN; ++i)
  76. {
  77. // Note the reversal of min and max during the conversion.
  78. op->iMaxV[i] = cmGrY_VtoP( grH, grObjH, op->fMinV[i] );
  79. op->iMinV[i] = cmGrY_VtoP( grH, grObjH, op->fMaxV[i] );
  80. }
  81. }
  82. errLabel:
  83. return rc;
  84. }
  85. bool _cmGrPlObjAfRender( cmGrObjFuncArgs_t* args, cmGrDcH_t dcH )
  86. {
  87. cmGrPlObjAf_t* op = (cmGrPlObjAf_t*)args->cbArg;
  88. if( _cmGrPlObjAfCalcImage(op, args->grH ) == kOkGrPlRC )
  89. {
  90. int i;
  91. cmGrPExt_t pext;
  92. cmGrPhysExtents( args->grH, &pext);
  93. cmGrDcSetColor(dcH, cmGrPlotObjCurLineColor(op->oH));
  94. // draw a horz line at y=0
  95. int y0 = cmGrY_VtoP( args->grH, cmGrPlotObjHandle(op->oH), 0.0 );
  96. cmGrDcDrawLine(dcH, cmGrPExtL(&op->pext), y0, cmGrPExtR(&op->pext) , y0 );
  97. // draw a vertical line for each
  98. for(i=0; i<op->pixN; ++i)
  99. cmGrDcDrawLine(dcH, op->pext.loc.x+i, op->iMinV[i], op->pext.loc.x+i, op->iMaxV[i] );
  100. // draw a rectangle around the entire audio clip
  101. cmGrDcDrawRect(dcH, op->pext.loc.x, cmGrPExtT(&pext), op->pext.sz.w, cmGrPExtB(&pext) );
  102. // draw the file label
  103. cmGrDcDrawTextJustify( dcH, cmGrPlotObjFontFamily(op->oH), cmGrPlotObjFontSize(op->oH), cmGrPlotObjFontStyle(op->oH), cmGrPlotObjLabel(op->oH), &op->pext, kHorzCtrJsGrFl | kTopJsGrFl );
  104. }
  105. return true;
  106. }
  107. bool _cmGrPlObjAfIsInside( cmGrObjFuncArgs_t* args, unsigned evtFlags, int px, int py, cmGrV_t vx, cmGrV_t vy )
  108. {
  109. cmGrPlObjAf_t* op = (cmGrPlObjAf_t*)args->cbArg;
  110. if( cmGrPExtIsXyInside( &op->pext, px, py ) )
  111. {
  112. px -= op->pext.loc.x;
  113. if( 0 <= px && px < op->pixN )
  114. return op->iMinV[px] <= py && py <= op->iMaxV[px];
  115. }
  116. return false;
  117. }
  118. void _cmGrPlObjAfDestroy( cmGrObjFuncArgs_t* args )
  119. {
  120. cmGrPlObjAf_t* op = (cmGrPlObjAf_t*)args->cbArg;
  121. args->cbArg = op->destroyCbArg;
  122. op->destroyCbFunc(args);
  123. cmMemFree(op->mem);
  124. cmMemFree(op);
  125. }
  126. cmGrPlRC_t cmGrPlotAudioFileObjCreate(
  127. cmGrPlObjH_t oH,
  128. cmAfmFileH_t afH,
  129. unsigned audioChIdx )
  130. {
  131. cmGrPlObjAf_t* op = cmMemAllocZ(cmGrPlObjAf_t,1);
  132. op->oH = oH;
  133. op->afH = afH;
  134. op->chIdx = audioChIdx;
  135. cmGrObjH_t grObjH = cmGrPlotObjHandle(op->oH);
  136. op->renderCbFunc = cmGrObjRenderCbFunc(grObjH);
  137. op->renderCbArg = cmGrObjRenderCbArg(grObjH);
  138. cmGrObjSetRenderCb( grObjH, _cmGrPlObjAfRender, op );
  139. op->destroyCbFunc = cmGrObjDestroyCbFunc(grObjH);
  140. op->destroyCbArg = cmGrObjDestroyCbArg(grObjH);
  141. cmGrObjSetDestroyCb( grObjH, _cmGrPlObjAfDestroy, op );
  142. op->isInsideCbFunc = cmGrObjIsInsideCbFunc(grObjH);
  143. op->isInsideCbArg = cmGrObjIsInsideCbArg(grObjH);
  144. cmGrObjSetIsInsideCb( grObjH, _cmGrPlObjAfIsInside, op );
  145. cmGrPlotObjSetUserPtr(oH,op);
  146. return kOkGrPlRC;
  147. }