convert ofSoundBuffer to ofBuffer

makeWavBuffer().cpp

    //--------------------------------------------------------------
    // referrered to ofxSoundObjects
    //--------------------------------------------------------------
    
    ofBuffer makeWavBuffer(const ofSoundBuffer &buff){
        // write a wav header
        short myFormat = 1; // for pcm
        int mySubChunk1Size = 16;
        int bitsPerSample = 16; // assume 16 bit pcm
        int myByteRate = buff.getSampleRate() * buff.getNumChannels() * bitsPerSample/8;
        short myBlockAlign = buff.getNumChannels() * bitsPerSample/8;
        int myChunkSize = 36 + buff.size()*bitsPerSample/8;
        int myDataSize = buff.size()*bitsPerSample/8;
        int channels = buff.getNumChannels();
        int samplerate = buff.getSampleRate();

        ofBuffer wav;
        wav.append("RIFF", 4);
        wav.append((char*) &myChunkSize, 4);
        wav.append("WAVE", 4);
        wav.append("fmt ", 4);
        wav.append((char*) &mySubChunk1Size, 4);
        wav.append((char*) &myFormat, 2); // should be 1 for PCM
        wav.append((char*) &channels, 2); // # channels (1 or 2)
        wav.append((char*) &samplerate, 4); // 44100
        wav.append((char*) &myByteRate, 4); //
        wav.append((char*) &myBlockAlign, 2);
        wav.append((char*) &bitsPerSample, 2); //16
        wav.append("data", 4);
        wav.append((char*) &myDataSize, 4);

        // write the wav file per the wav file format, 4096 bytes of data at a time.
        const int WRITE_BUFF_SIZE = 4096;
        short writeBuff[WRITE_BUFF_SIZE];
        int pos = 0;
        while(pos<buff.size()) {
            int len = MIN(WRITE_BUFF_SIZE, buff.size()-pos);
            for(int i = 0; i < len; i++) {
                writeBuff[i] = (int)(buff[pos]*32767.f);
                pos++;
            }
            wav.append((char*)writeBuff, len*bitsPerSample/8);
        }
        return wav;
    }