libcm is a C development framework with an emphasis on audio signal processing applications.
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cmProcTemplateHdr.h 2.6KB

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  1. /*
  2. enum
  3. {
  4. kNoConvertFftFl = 0x00, // do not fill magV or phsV (leave output in complexV)
  5. kToPolarFftFl = 0x01, // fill magV and phsV with the polar form of complexV
  6. kToRectFftFl = 0x02 // fill magV (real) and phsV (imag) with the rect. form of commplexV,
  7. };
  8. */
  9. //-----------------------------------------------------------------------------------------------------------
  10. // FFT
  11. //
  12. #ifndef CONST_GUARD
  13. #define CONST_GUARD
  14. enum
  15. {
  16. kNoConvertFftFl = 0x00, // do not fill magV or phsV (leave output in complexV)
  17. kToPolarFftFl = 0x01, // fill magV and phsV with the polar form of complexV
  18. kToRectFftFl = 0x02 // fill magV (real) and phsV (imag) with the rect. form of commplexV,
  19. };
  20. #endif
  21. typedef struct STRUCT(Fft)
  22. {
  23. cmObj obj;
  24. FFT_PLAN_T0 plan; // fftw plan
  25. T0* inPtr; //
  26. COMPLEX_T0* complexV; // fft output in complex form
  27. unsigned wndSmpCnt; // length of the fft input buffer
  28. T1* magV; // magnitude or real output (amplitude NOT power)
  29. T1* phsV; // phase or imag output
  30. unsigned binCnt; // length of magV and phsV
  31. unsigned flags;
  32. bool copyFl;
  33. cmMtxFile* mfp;
  34. } CLASS(Fft);
  35. CLASS(Fft)* MEMBER(FftAlloc)( cmCtx* c, CLASS(Fft)* p, T0* inPtr, unsigned wndSmpCnt, unsigned flags );
  36. cmRC_t MEMBER(FftFree)( CLASS(Fft)** pp );
  37. cmRC_t MEMBER(FftInit)( CLASS(Fft)* p, T0* inPtr, unsigned wndSmpCnt, unsigned flags );
  38. cmRC_t MEMBER(FftFinal)( CLASS(Fft)* p );
  39. /// Set sp to NULL if a fixed input buffer was given in the call to cmFftAlloc() or cmFftInit()
  40. cmRC_t MEMBER(FftExec)( CLASS(Fft)* p, const T0* sp, unsigned sn );
  41. //-----------------------------------------------------------------------------------------------------------
  42. // IFFT
  43. //
  44. typedef struct STRUCT(IFft)
  45. {
  46. cmObj obj;
  47. unsigned binCnt;
  48. unsigned outN;
  49. COMPLEX_T1* complexV; // the type of complexV should match the type of outV
  50. T1* outV;
  51. FFT_PLAN_T1 plan;
  52. } CLASS(IFft);
  53. CLASS(IFft)* MEMBER(IFftAlloc)( cmCtx* c, CLASS(IFft)* p, unsigned binCnt );
  54. cmRC_t MEMBER(IFftFree)( CLASS(IFft)** pp );
  55. cmRC_t MEMBER(IFftInit)( CLASS(IFft)* p, unsigned binCnt );
  56. cmRC_t MEMBER(IFftFinal)( CLASS(IFft)* p );
  57. // x must contain 'binCnt' elements.
  58. cmRC_t MEMBER(IFftExec)( CLASS(IFft)* p, COMPLEX_T0* x );
  59. cmRC_t MEMBER(IFftExecPolar)( CLASS(IFft)* p, const T0* magV, const T0* phsV );
  60. cmRC_t MEMBER(IFftExecRect)( CLASS(IFft)* p, const T0* rV, const T0* iV );