qt录音--raw(pcm)文件转换wav文件

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转载：http://blog.sina.com.cn/s/blog_671732440100xk46.html

Qt录音需要用到#include <QtMultimedia/QAudioInput>

void ***::***()

{

QFile inputFile;

QAudioInput *audioInput;

inputFile.setFileName("a.raw");

inputFile.open(QIODevice::WriteOnly | QIODevice::Truncate);

QAudioFormat format;

format.setSampleRate(8000);

format.setChannels(2);

format.setSampleSize(16);

format.setCodec("audio/pcm");

format.setByteOrder(QAudioFormat::LittleEndian);

format.setSampleType(QAudioFormat::SignedInt);

QAudioDeviceInfo info(QAudioDeviceInfo::defaultInputDevice());

if (!info.isFormatSupported(format))

{

qWarning() << "default format not supported try to use nearest";

format = info.nearestFormat(format);

}

audioInput = new QAudioInput(format, this);

QTimer::singleShot(10000, this, SLOT(stopRecording()));

audioInput->start(&inputFile);

qDebug() << "record begin!";

}

void ***::stopRecording()

{

audioInput->stop();

inputFile.close();

delete audioInput;

qDebug() << "record end!";

}

然后播放的时候，可以把raw文件加个文件头，变成wav文件

typedef struct

{

char fccID[4]; //"RIFF"

unsigned long dwSize;//length-8

char fccType[4]; //"WAVE"

}HEADER;

typedef struct

{

char fccID[4]; //"fmt "

unsigned long dwSize; //16

unsigned short wFormatTag; //1

unsigned short wChannels; //1 or 2

unsigned long dwSamplesPerSec; //44100

unsigned long dwAvgBytesPerSec; //

unsigned short wBlockAlign; //声道数*量化数/8

unsigned short uiBitsPerSample; //量化数 8 or 16

}FMT;

typedef struct

{

char fccID[4]; //"data"

unsigned long dwSize; //length-44

}DATA;

//转换文件为wav

HEADER pcmHEADER;

FMT pcmFMT;

DATA pcmDATA;

unsigned long m_pcmData;

FILE *fp, *fpCopy;

fp = fopen("a.raw", "rb");

fpCopy = fopen("a.wav", "wb+");

if(!fp)

{

qDebug() << "open pcm file error";

return;

}

if(!fpCopy)

{

qDebug() << "create wave file error";

return;

}

qstrcpy(pcmHEADER.fccID, "RIFF");

qstrcpy(pcmHEADER.fccType, "WAVE");

fseek(fpCopy, sizeof(HEADER), 1);

pcmFMT.dwSamplesPerSec = 8000;

pcmFMT.dwAvgBytesPerSec = pcmFMT.dwSamplesPerSec*sizeof(m_pcmData);

pcmFMT.uiBitsPerSample = 16;

qstrcpy(pcmFMT.fccID, "fmt ");

pcmFMT.dwSize = 16;

pcmFMT.wBlockAlign = 4;

pcmFMT.wChannels = 2;

pcmFMT.wFormatTag = 1;

fwrite(&pcmFMT, sizeof(FMT), 1, fpCopy);

qstrcpy(pcmDATA.fccID, "data");

pcmDATA.dwSize = 0;

fseek(fpCopy, sizeof(DATA), 1);

fread(&m_pcmData, sizeof(unsigned long), 1, fp);

while(!feof(fp))

{

pcmDATA.dwSize += 4; //计算数据的长度；每读入一个数据，长度就加一；

fwrite(&m_pcmData, sizeof(unsigned long), 1, fpCopy); //将数据写入.wav文件;

fread(&m_pcmData, sizeof(unsigned long), 1, fp); //从.pcm中读入数据

}

fclose(fp);

pcmHEADER.dwSize = 44+pcmDATA.dwSize-8; //根据pcmDATA.dwsize得出pcmHEADER.dwsize的值

rewind(fpCopy); //将fpCpy变为.wav的头，以便于写入HEADER和DATA;

fwrite(&pcmHEADER, sizeof(HEADER), 1, fpCopy); //写入HEADER

fseek(fpCopy, sizeof(FMT), 1); //跳过FMT,因为FMT已经写入

fwrite(&pcmDATA, sizeof(DATA), 1, fpCopy); //写入DATA;

fclose(fpCopy)

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