/**
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* 叶海辉
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* QQ群121376426
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* http://blog.yundiantech.com/
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*/
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#include "PcmVolumeControl.h"
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typedef signed char int8_t;
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typedef signed short int16_t;
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typedef signed int int32_t;
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef unsigned int uint32_t;
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typedef unsigned long DWORD;
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typedef int BOOL;
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typedef unsigned char BYTE;
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typedef unsigned short WORD;
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typedef float FLOAT;
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typedef FLOAT *PFLOAT;
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typedef int INT;
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typedef unsigned int UINT;
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typedef unsigned int *PUINT;
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typedef unsigned long ULONG_PTR, *PULONG_PTR;
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typedef ULONG_PTR DWORD_PTR, *PDWORD_PTR;
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#define MAKEWORD(a, b) ((WORD)(((BYTE)(((DWORD_PTR)(a)) & 0xff)) | ((WORD)((BYTE)(((DWORD_PTR)(b)) & 0xff))) << 8))
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#define MAKELONG(a, b) ((LONG)(((WORD)(((DWORD_PTR)(a)) & 0xffff)) | ((DWORD)((WORD)(((DWORD_PTR)(b)) & 0xffff))) << 16))
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#define LOWORD(l) ((WORD)(((DWORD_PTR)(l)) & 0xffff))
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#define HIWORD(l) ((WORD)((((DWORD_PTR)(l)) >> 16) & 0xffff))
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#define LOBYTE(w) ((BYTE)(((DWORD_PTR)(w)) & 0xff))
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#define HIBYTE(w) ((BYTE)((((DWORD_PTR)(w)) >> 8) & 0xff))
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PcmVolumeControl::PcmVolumeControl()
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{
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}
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///buf为需要调节音量的音频数据块首地址指针，size为长度，uRepeat为重复次数，通常设为1，vol为增益倍数,可以小于1
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void PcmVolumeControl::RaiseVolume(char* buf, int size, int uRepeat, double vol)
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{
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if (!size)
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{
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return;
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}
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for (int i = 0; i < size; i += 2)
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{
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short wData;
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wData = MAKEWORD(buf[i], buf[i + 1]);
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long dwData = wData;
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for (int j = 0; j < uRepeat; j++)
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{
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dwData = dwData * vol;
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if (dwData < -0x8000)
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{
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dwData = -0x8000;
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}
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else if (dwData > 0x7FFF)
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{
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dwData = 0x7FFF;
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}
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}
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wData = LOWORD(dwData);
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buf[i] = LOBYTE(wData);
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buf[i + 1] = HIBYTE(wData);
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}
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}
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