编程音频

⑴ C语言编写程序将多个wav文件拼接成一个音频wav文件并播放

#include<stdio.h>
#include<string.h>

#defineRIFF_SIGN_ID0x46464952ul
#defineWAVE_SIGN_ID0x45564157ul
#defineFMT__SIGN_ID0x20746D66ul
#defineFACT_SIGN_ID0x74636166ul
#defineDATA_SIGN_ID0x61746164ul

#ifndefDWORD
typedefunsignedlongDWORD;
#endif

#ifndefWORD
typedefunsignedshortWORD;
#endif

#ifndefBYTE
typedefunsignedcharBYTE;
#endif
structRIFF_HEADER
{
	DWORDRiffID;//资源交换文件标志0x46464952'R','I','F','F'
	DWORDRiffSize;//从下个地址开始到文件尾的总字节数
	DWORDRiffFormat;//WAV文件标志0x45564157'W','A','V','E'
};

structWAVE_FORMAT
{
	WORDFormatTag;//格式种类(值为1时，表示数据为线性PCM编码)
	WORDChannels;//通道数，单声道为1，双声道为2
	DWORDSamplesPerSec;//采样频率
	DWORDAvgBytesPerSec;//每秒所需字节数
	WORDBlockAlign;//数据块对齐单位（每个采样需要的字节数）
	WORDBitsPerSample;//每个采样需要的bit数
	WORDotherInfo;//附加信息（可选，通过Size来判断有无）
};

structFMT_BLOCK
{
	DWORDFmtID;//波形格式标志0x20746D66'f','m','t',''
	DWORDFmtSize;//波形格式部分长度（一般为00000010H）
	WAVE_FORMATwavFormat;//波形数据格式
};

structUNKNOW_BLOCK
{
	DWORDID;//未知块
	DWORDSize;//未知块长度
};

structFACT_BLOCK
{
	DWORDFactID;//可选部分标识0x74636166'f','a','c','t'
	DWORDFactSize;//可选部分长度
	BYTEData[1];//可选部分数据
};

structDATA_BLOCK
{
	DWORDDataID;//数据标志符0x61746164,'d','a','t','a'
	DWORDDataSize;//DATA总数据长度字节
	BYTEData[1];//数据
};


BYTE*openWaveFile(constchar*name);
BYTE*getWaveData(BYTE*wav,int*dLen);
voidprintWaveFormat(BYTE*wav);
intsaveWaveFile(constchar*name,BYTE*wav);
BYTE*catWave(BYTE*&wav1,BYTE*&wav2);
size_tgetTotalLen(BYTE*wav);

intmain(intargc,char*argv[])
{
	intdLen;
	BYTE*data1=openWaveFile("1.wav");
	printWaveFormat(data1);
	BYTE*data2=openWaveFile("2.wav");
	printWaveFormat(data2);
	data1=catWave(data1,data2);
	printWaveFormat(data1);
	saveWaveFile("3.wav",data1);
	return0;
}

BYTE*openWaveFile(constchar*name)
{
	size_treadByte;
	FILE*fp=fopen(name,"rb");
	if(fp==NULL)returnNULL;

	RIFF_HEADERfh;
	if(fread(&fh,sizeof(fh),1,fp)!=1)
	{
		fclose(fp);
		printf("RiffHeader文件长度错误
");
		returnNULL;
	}
	if(fh.RiffFormat!=WAVE_SIGN_ID||fh.RiffID!=RIFF_SIGN_ID)
	{
		fclose(fp);
		printf("文件标识符错误ID:%08XFormat:%08X
",fh.RiffID,fh.RiffFormat);
		returnNULL;
	}
	BYTE*r=newBYTE[fh.RiffSize+10],*pr;
	if(r==NULL)
	{
		fclose(fp);
		printf("内存申请错误
");
		returnNULL;
	}
	readByte=fread(r,1,fh.RiffSize-4,fp);
	if(readByte!=fh.RiffSize-4)
	{
		delete[]r;
		printf("wave文件长度错误%d%d
",readByte,fh.RiffSize);
		returnNULL;
	}
	fclose(fp);

	FMT_BLOCK*fb=(FMT_BLOCK*)r;
	if(fb->FmtID!=FMT__SIGN_ID)
	{
		printf("格式标识符错误或格式大小错误ID:%08X
",fb->FmtID);
		delete[]r;
		returnNULL;
	}
	if(fb->wavFormat.FormatTag!=1)
	{
		delete[]r;
		printf("不支持的格式Format:%d
",fb->wavFormat.FormatTag);
		returnNULL;
	}

	pr=r+8+fb->FmtSize;
	while(1)
	{
		UNKNOW_BLOCK*ub=(UNKNOW_BLOCK*)pr;
		if(ub->ID==FACT_SIGN_ID)
		{
			printf("Fact标签length:%d
",ub->Size);
			pr+=8+ub->Size;
		}
		elsebreak;
	}
	DATA_BLOCK*db=(DATA_BLOCK*)pr;
	if(db->DataID!=DATA_SIGN_ID)
	{
		delete[]r;
		printf("数据错误
");
		returnNULL;
	}
	returnr;
}

BYTE*getWaveData(BYTE*wav,int*dLen)
{
	UNKNOW_BLOCK*ub=(UNKNOW_BLOCK*)wav;
	while(ub->ID!=DATA_SIGN_ID)
	{
		switch(ub->ID)
		{
		caseDATA_SIGN_ID:
			break;
		caseFMT__SIGN_ID:
		caseFACT_SIGN_ID:
			ub=(UNKNOW_BLOCK*)(((BYTE*)ub)+ub->Size+8);
			break;
		default:
			printf("错误标签%08X
",ub->ID);
			returnNULL;
		}
	}
	DATA_BLOCK*db=(DATA_BLOCK*)ub;
	*dLen=db->DataSize;
	returndb->Data;
}

size_tgetTotalLen(BYTE*wav)
{
	size_tr=0;
	UNKNOW_BLOCK*ub=(UNKNOW_BLOCK*)wav;
	while(1)
	{
		switch(ub->ID)
		{
		caseDATA_SIGN_ID:
			r+=ub->Size+8;
			returnr;
		caseFMT__SIGN_ID:
		caseFACT_SIGN_ID:
			r+=ub->Size+8;
			ub=(UNKNOW_BLOCK*)(((BYTE*)ub)+ub->Size+8);
			break;
		default:
			printf("错误标签%08X
",ub->ID);
			returnNULL;
		}
	}
	return-1;
}
		voidprintWaveFormat(BYTE*wav)
{
	intlen;
	getWaveData(wav,&len);
	FMT_BLOCK*fb=(FMT_BLOCK*)wav;
	printf("Wave格式：PCM
");
	printf("通道数量：%d
",fb->wavFormat.Channels);
	printf("采样频率：%dHz
",fb->wavFormat.SamplesPerSec);
	printf("每秒所需字节数：%d字节
",fb->wavFormat.AvgBytesPerSec);
	printf("数据块对齐单位：%d字节
",fb->wavFormat.BlockAlign);
	printf("每个采样需要的bit数：%dbit
",fb->wavFormat.BitsPerSample);
	printf("长度：%.2f秒
",(double)len/fb->wavFormat.AvgBytesPerSec);
}

BYTE*catWave(BYTE*&wav1,BYTE*&wav2)
{
	FMT_BLOCK*fb1=(FMT_BLOCK*)wav2;
	constFMT_BLOCK*fb2=(constFMT_BLOCK*)wav2;
	if(
		fb1->wavFormat.AvgBytesPerSec==fb2->wavFormat.AvgBytesPerSec&&
		fb1->wavFormat.BitsPerSample==fb2->wavFormat.BitsPerSample&&
		fb1->wavFormat.BlockAlign==fb2->wavFormat.BlockAlign&&
		fb1->wavFormat.Channels==fb2->wavFormat.Channels&&
		fb1->wavFormat.FormatTag==fb2->wavFormat.FormatTag&&
		fb1->wavFormat.SamplesPerSec==fb2->wavFormat.SamplesPerSec)
	{
		intlen1=getTotalLen(wav1),len2;
		BYTE*Data2=getWaveData(wav2,&len2);
		BYTE*nD=newBYTE[len1+len2+10];
		if(nD==NULL)returnNULL;
		memcpy(nD,wav1,len1);
		delete[]wav1;
		wav1=nD;
		BYTE*Data1=getWaveData(wav1,&len1);
		DATA_BLOCK*db1=(DATA_BLOCK*)(Data1-8);
		db1->DataSize+=len2;
		memcpy(Data1+len1,Data2,len2);
		returnwav1;
	}
	returnNULL;
}

intsaveWaveFile(constchar*name,BYTE*wav)
{
	FILE*fp=fopen(name,"wb");
	if(fp==0)return0;
	intlen=getTotalLen(wav);
	RIFF_HEADERrh;
	rh.RiffFormat=WAVE_SIGN_ID;
	rh.RiffID=RIFF_SIGN_ID;
	rh.RiffSize=len+4;
	fwrite(&rh,sizeof(rh),1,fp);
	fwrite(wav,1,len,fp);
	fclose(fp);
	return1;
}