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#ifndef __VOLUME_H_ #define __VOLUME_H_ #define UINT32 unsigned int typedef unsigned long DWORD; typedef unsigned long* DWORD_PTR; typedef unsigned char BYTE; typedef unsigned short WORD; typedef int BOOL; /* MAKEWORD将两个无符号8位整合成16位 LOWORD()得到一个32bit数的低16bit HIWORD()得到一个32bit数的高16bit LOBYTE()得到一个16bit数最低（最右边）那个字节 HIBYTE()得到一个16bit数最高（最左边）那个字节 */ #define MAKEWORD(a,b) ((WORD) (((BYTE) (a)) | ((WORD) ((BYTE) (b))) << 8)) #define LOWORD(l) ((WORD)(((UINT32)(l)) & 0xffff)) #define HIWORD(l) ((WORD)((((UINT32)(l)) >> 16) & 0xffff)) #define LOBYTE(w) ((BYTE)(((WORD)(w)) & 0xff)) #define HIBYTE(w) ((BYTE)((((WORD)(w)) >> 8) & 0xff)) //#define MAKEWORD(a, b) ((WORD)(((BYTE)(((DWORD_PTR)(a)) & 0xff)) | ((WORD)((BYTE)(((DWORD_PTR)(b)) & 0xff))) << 8)) //#define LOWORD(l) ((WORD)(((DWORD_PTR)(l)) & 0xffff)) //#define HIWORD(l) ((WORD)((((DWORD_PTR)(l)) >> 16) & 0xffff)) //#define LOBYTE(w) ((BYTE)(((DWORD_PTR)(w)) & 0xff)) //#define HIBYTE(w) ((BYTE)((((DWORD_PTR)(w)) >> 8) & 0xff)) void RaiseVolume(char* buf, UINT32 size,UINT32 uRepeat,double vol); #endif ========================================================================= ========================================================================== #include <stdio.h> #include <malloc.h> #include "volume.h" //通过编程实现调整PCM的音量，具体做法是乘上一个固定的数，但是要考虑数据的溢出问题。 /*int frame_size_get(int inSampleRate, int ChannleNumber) { int size= -1; switch(inSampleRate) { case 8000: { size= 320; } break; case 16000: { size= 640; } break; case 24000: { size= 960; } break; case 32000: { size= 1280; } break; case 48000: { size= 1920; } break; case 44100: { size= 441*4;//为了保证8K输出有320,441->80,*4->320 } break; case 22050: { size= 441*2; } break; case 11025: { size= 441; } break; default: break; } return ChannleNumber*size; } */ #if 1 void RaiseVolume(char* buf, UINT32 size,UINT32 uRepeat,double vol) { if (!size ) { return; } for (int i = 0; i < size;) { signed long minData = -0x8000; //如果是8bit编码这里变成-0x80 signed long maxData = 0x7FFF;//如果是8bit编码这里变成0xFF signed short wData = buf[i+1]; wData = MAKEWORD(buf[i],buf[i+1]); signed long dwData = wData; for (int j = 0; j < uRepeat; j++) { dwData = dwData * vol;//1.25; if (dwData < -0x8000) { dwData = -0x8000; } else if (dwData > 0x7FFF) { dwData = 0x7FFF; } } wData = LOWORD(dwData); buf[i] = LOBYTE(wData); buf[i+1] = HIBYTE(wData); i += 2; } } #endif //vol取0—10即可，为0时为静音，小于1声音减小，大于1声音增大，测试取大于10的数字效果不明显 /*int pcm_volume_control(char* foldname, char* fnewname, double vol) { HXD_WAVFLIEHEAD head; int frame_size= 0; char* frame_buffer; FILE* fp_old= fopen(foldname,"rb+"); FILE* fp_new= fopen(fnewname,"wb+"); if((NULL== fp_old) || (NULL== fp_new)) { return -1; } fread(&head,1,sizeof(head),fp_old); fwrite(&head,1,sizeof(head),fp_new); frame_size= frame_size_get( head.nSampleRate,head.nChannleNumber); frame_buffer= (char*)malloc(frame_size); while(frame_size== fread(frame_buffer,1,frame_size,fp_old)) { RaiseVolume(frame_buffer,frame_size,1,vol); fwrite(frame_buffer,1,frame_size,fp_new); } fclose(fp_old); fclose(fp_new); free(frame_buffer); return 0; }*/ /* void CAudioControlDlg::OnButtonAdd() { // TODO: Add your control notification handler code here pcm_volume_control("old.wav","new.wav",5); }*/ |
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