根据要求填充，ACM波形.wav格式的文件头

//根据要求填充，ACM波形.wav格式的文件头

 

#pragma pack(push,1)

 

typedef struct tagPcmWaveHeader

{

unsigned char riff[4];

unsigned long file_length;

unsigned char wave[4];

unsigned char fmt[4];

unsigned long format_length;

short wFormatTag; 

short nChannels; 

unsigned long nSamplesPerSec; 

unsigned long nAvgBytesPerSec; 

short nBlockAlign; 

short wBitsPerSample; 

unsigned char data[4];

unsigned long data_length;

}PCM_WAVE_HEADER,*PPCM_WAVE_HEADER;

 

#pragma pack(pop)

 

void FillAcmWavHeader(PPCM_WAVE_HEADER header,unsigned long length,

 unsigned short _nChannelsRes,unsigned long _nSamplesPerSecRes,short _wBitsPerSampleRes)

{

strncpy((char*)header->riff, "RIFF", 4);

header->file_length = sizeof(PCM_WAVE_HEADER) + length - 8;

strncpy((char*)header->wave, "WAVE", 4);

strncpy((char*)header->fmt,  "fmt ", 4);

 

header->format_length   = 16;

header->wFormatTag      = 1;

header->nChannels       = _nChannelsRes;

header->nSamplesPerSec  = _nSamplesPerSecRes;

header->wBitsPerSample  = _wBitsPerSampleRes;

header->nBlockAlign     = header->nChannels * header->wBitsPerSample / 8;

header->nAvgBytesPerSec = header->nSamplesPerSec * header->nBlockAlign;

 

strncpy((char*)header->data, "data", 4);

header->data_length = length;

}