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CPI_Equaliser_Basic.c
资源名称：Visual C++视频音频开发实用工程案例精选.rar　[点击查看]
上传用户：tuheem
上传日期：2007-05-01
资源大小：21889k
文件大小：7k
源码类别：

多媒体编程

开发平台：

Visual C++

CPI_Equaliser_Basic.c：源码内容
  1. #include "stdafx.h"
  2. #include "globals.h"
  3. #include "CPI_Player.h"
  4. #include "CPI_Equaliser.h"
  7. typedef struct _CPs_EqualiserContext_Basic
  8. {
  9.     BOOL m_bEnabled;
  10.     int m_aryLevels[10];
  11.     BOOL m_bStreamIsCapable;
  12.     unsigned int m_aryHistory[256];
  13.     unsigned int m_aryFuture[256];
  14.     unsigned int m_iCursor;
  16.     int m_arySum_left[9];
  17.     int m_arySum_right[9];
  19. } CPs_EqualiserContext_Basic;
  22. #define CIC_WRAPSAMPLE(expr) (expr&0xFF)
  23. #define CIC_DECODESAMPLE_LEFT(expr) (*(short*)&(expr))
  24. #define CIC_DECODESAMPLE_RIGHT(expr) (*((short*)&(expr) + 1))
  25. #define CIC_FPMULTIPLY(expr1, expr2) ( ( (expr1) * (expr2) )>>8 )
  26. #define CIC_TRUNCATESHORT(expr)    (((expr) > SHRT_MAX) ? SHRT_MAX : (((expr) < SHRT_MIN) ? SHRT_MIN : (expr)))
  28. const int glb_iEQOffsets[] = { 1, 2, 4, 8, 16, 32, 64, 128, 256 };
  29. const int glb_iEQOffsets_his[] = { -1, -2, -4, -8, -16, -32, -64, -128, -256 };
  32. void CPP_EBSC_Initialise(CPs_EqualiserModule* pModule, const int iFrequency, const BOOL b16bit);
  33. void CPP_EBSC_Uninitialise(CPs_EqualiserModule* pModule);
  34. void CPP_EBSC_ApplySettings(CPs_EqualiserModule* pModule, const CPs_EQSettings* pSettings, BOOL* pbEnableStateChanged);
  35. void CPP_EBSC_ApplyEQToBlock_Inplace(CPs_EqualiserModule* pModule, void* pPCMBlock, const DWORD dwBlockSize);
  36. //
  37. void CPI_Player_Equaliser_Initialise_Basic(CPs_EqualiserModule* pModule)
  38. {
  39.     CPs_EqualiserContext_Basic* pContext;
  41.     pModule->Initialise = CPP_EBSC_Initialise;
  42.     pModule->Uninitialise = CPP_EBSC_Uninitialise;
  43.     pModule->ApplySettings = CPP_EBSC_ApplySettings;
  44.     pModule->ApplyEQToBlock_Inplace = CPP_EBSC_ApplyEQToBlock_Inplace;
  46.     pContext = (CPs_EqualiserContext_Basic*)malloc(sizeof(CPs_EqualiserContext_Basic));
  47.     pModule->m_pModuleCookie = pContext;
  49.     memset(pContext->m_aryLevels, 0, sizeof(pContext->m_aryLevels));
  50.     pContext->m_bEnabled = FALSE;
  51. }
  52. //
  53. void CPP_EBSC_Initialise(CPs_EqualiserModule* pModule, const int iFrequency, const BOOL b16bit)
  54. {
  55.     CPs_EqualiserContext_Basic* pContext = (CPs_EqualiserContext_Basic*)pModule->m_pModuleCookie;
  56.     CP_TRACE0("Equaliser (re)initialising");
  58.     memset(pContext->m_aryHistory, 0, sizeof(pContext->m_aryHistory));
  59.     memset(pContext->m_aryFuture, 0, sizeof(pContext->m_aryFuture));
  60.     memset(pContext->m_arySum_left, 0, sizeof(pContext->m_arySum_left));
  61.     memset(pContext->m_arySum_right, 0, sizeof(pContext->m_arySum_right));
  62.     pContext->m_iCursor = 0;
  64.     if(iFrequency == 44100 && b16bit == TRUE)
  65.         pContext->m_bStreamIsCapable = TRUE;
  66.     else
  67.         pContext->m_bStreamIsCapable = FALSE;
  68. }
  69. //
  70. void CPP_EBSC_Uninitialise(CPs_EqualiserModule* pModule)
  71. {
  72.     CPs_EqualiserContext_Basic* pContext = (CPs_EqualiserContext_Basic*)pModule->m_pModuleCookie;
  73.     CP_CHECKOBJECT(pContext);
  74.     CP_TRACE0("Equaliser shutting down");
  76.     free(pContext);
  77.     pModule->m_pModuleCookie = NULL;
  78. }
  79. //
  80. void CPP_EBSC_ApplySettings(CPs_EqualiserModule* pModule, const CPs_EQSettings* pSettings, BOOL* pbEnableStateChanged)
  81. {
  82.     CPs_EqualiserContext_Basic* pContext = (CPs_EqualiserContext_Basic*)pModule->m_pModuleCookie;
  83.     int iBandIDX = 0;
  85.     for(iBandIDX=0; iBandIDX < 8; iBandIDX++)
  86.         pContext->m_aryLevels[9-iBandIDX] = (pSettings->m_aryBands[iBandIDX]<<1) + 256;
  88.     pContext->m_aryLevels[0] = pContext->m_aryLevels[2];
  89.     pContext->m_aryLevels[1] = pContext->m_aryLevels[2];
  91.     if(pContext->m_bEnabled == pSettings->m_bEnabled)
  92.         *pbEnableStateChanged = FALSE;
  93.     else
  94.         *pbEnableStateChanged = TRUE;
  95.     pContext->m_bEnabled = pSettings->m_bEnabled;
  96. }
  97. //
  98. void CPP_EBSC_ApplyEQToBlock_Inplace(CPs_EqualiserModule* pModule, void* _pPCMBlock, const DWORD dwBlockSize)
  99. {
  100.     CPs_EqualiserContext_Basic* pContext = (CPs_EqualiserContext_Basic*)pModule->m_pModuleCookie;
  101.     const int iNumSamples = dwBlockSize >> 2;
  102.     int* pSampleBase = (int*)_pPCMBlock;
  103.     int iSampleIDX, iPointIDX;
  104.     unsigned int iThisSample, iThisSample_EQ;
  105.     int iThisSample_left, iThisSample_right;
  106.     int aryCoefficient_left[9], aryCoefficient_right[9];
  107.     int iClips = 0;
  109.     if(pContext->m_bStreamIsCapable == FALSE || pContext->m_bEnabled == FALSE)
  110.         return;
  112.     for(iSampleIDX =0; iSampleIDX < iNumSamples; iSampleIDX++)
  113.     {
  114.         iThisSample = pContext->m_aryFuture[pContext->m_iCursor];
  115.         pContext->m_aryFuture[pContext->m_iCursor] = pSampleBase[iSampleIDX];
  117.         iThisSample_left = CIC_DECODESAMPLE_LEFT(iThisSample);
  118.         iThisSample_right = CIC_DECODESAMPLE_RIGHT(iThisSample);
  121.         for(iPointIDX =0; iPointIDX < 9; iPointIDX++)
  122.         {
  123.             pContext->m_arySum_left[iPointIDX] += CIC_DECODESAMPLE_LEFT(pContext->m_aryFuture[CIC_WRAPSAMPLE(pContext->m_iCursor+glb_iEQOffsets[iPointIDX])]);
  124.             pContext->m_arySum_right[iPointIDX] += CIC_DECODESAMPLE_RIGHT(pContext->m_aryFuture[CIC_WRAPSAMPLE(pContext->m_iCursor+glb_iEQOffsets[iPointIDX])]);
  125.         }
  127.         for(iPointIDX =0; iPointIDX < 9; iPointIDX++)
  128.         {
  129.             aryCoefficient_left[iPointIDX] = pContext->m_arySum_left[iPointIDX] >> (iPointIDX+1);
  130.             aryCoefficient_right[iPointIDX] = pContext->m_arySum_right[iPointIDX] >> (iPointIDX+1);
  131.         }
  133.         iThisSample_left = CIC_FPMULTIPLY(iThisSample_left - aryCoefficient_left[0], pContext->m_aryLevels[0]);
  134.         iThisSample_right = CIC_FPMULTIPLY(iThisSample_right - aryCoefficient_right[0], pContext->m_aryLevels[0]);
  135.         for(iPointIDX =0; iPointIDX < 8; iPointIDX++)
  136.         {
  137.             iThisSample_left += CIC_FPMULTIPLY(aryCoefficient_left[iPointIDX] - aryCoefficient_left[iPointIDX+1], pContext->m_aryLevels[iPointIDX+1]);
  138.             iThisSample_right += CIC_FPMULTIPLY(aryCoefficient_right[iPointIDX] - aryCoefficient_right[iPointIDX+1], pContext->m_aryLevels[iPointIDX+1]);
  139.         }
  140.         iThisSample_left += CIC_FPMULTIPLY(aryCoefficient_left[8], pContext->m_aryLevels[9]);
  141.         iThisSample_right += CIC_FPMULTIPLY(aryCoefficient_right[8], pContext->m_aryLevels[9]);
  143.         for(iPointIDX =0; iPointIDX < 9; iPointIDX++)
  144.         {
  145.             pContext->m_arySum_left[iPointIDX] -= CIC_DECODESAMPLE_LEFT(pContext->m_aryHistory[CIC_WRAPSAMPLE(pContext->m_iCursor+glb_iEQOffsets_his[iPointIDX])]);
  146.             pContext->m_arySum_right[iPointIDX] -= CIC_DECODESAMPLE_RIGHT(pContext->m_aryHistory[CIC_WRAPSAMPLE(pContext->m_iCursor+glb_iEQOffsets_his[iPointIDX])]);
  147.         }
  149.         *(short*)&iThisSample_EQ = CIC_TRUNCATESHORT(iThisSample_left);
  150.         *((short*)&iThisSample_EQ + 1) = CIC_TRUNCATESHORT(iThisSample_right);
  152.         pSampleBase[iSampleIDX] = iThisSample_EQ;
  153.         pContext->m_aryHistory[pContext->m_iCursor] = iThisSample;
  155.         pContext->m_iCursor = CIC_WRAPSAMPLE(pContext->m_iCursor+1);
  156.     }
  157. }
  158. //