qt录音--raw(pcm)文件转换wav文件
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wavHEADER 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HEADERfseek(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)来源：http://blog.sina.com.cn/s/blog_671732440100xk46.html