コード例 #1
0
//--------------------------------------------------------------
bool ofxSoundFile::save(string path, const ofSoundBuffer &buff){
	// check that we're writing a wav and complain if the file extension is wrong.
	ofFile f(path);
	if(ofToLower(f.getExtension())!="wav") {
		path += ".wav";
		ofLogWarning() << "Can only write wav files - will save file as " << path;
	}
	
	fstream file(ofToDataPath(path).c_str(), ios::out | ios::binary);
	if(!file.is_open()) {
		ofLogError() << "Error opening sound file '" << path << "' for writing";
		return false;
	}
	
	// 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();
	
	file.seekp (0, ios::beg);
	file.write ("RIFF", 4);
	file.write ((char*) &myChunkSize, 4);
	file.write ("WAVE", 4);
	file.write ("fmt ", 4);
	file.write ((char*) &mySubChunk1Size, 4);
	file.write ((char*) &myFormat, 2); // should be 1 for PCM
	file.write ((char*) &channels, 2); // # channels (1 or 2)
	file.write ((char*) &samplerate, 4); // 44100
	file.write ((char*) &myByteRate, 4); //
	file.write ((char*) &myBlockAlign, 2);
	file.write ((char*) &bitsPerSample, 2); //16
	file.write ("data", 4);
	file.write ((char*) &myDataSize, 4);
	
	// write the wav file per the wav file format, 4096 bytes of data at a time.
	#define 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++;
		}
		file.write((char*)writeBuff, len*bitsPerSample/8);
	}
	
	file.close();
	return true;
}
コード例 #2
0
void ofxBasicSoundPlayer::audioOut(ofSoundBuffer& outputBuffer){
	if(bIsPlaying){
	int nFrames = outputBuffer.getNumFrames();
	int nChannels = outputBuffer.getNumChannels();
        if (playerNumChannels != nChannels || playerNumFrames != nFrames || playerSampleRate != outputBuffer.getSampleRate()) {
            audioOutBuffersChanged(nFrames, nChannels, outputBuffer.getSampleRate());
        }
		if(streaming){
			int samplesRead = soundFile.readTo(buffer,nFrames);
			if ( samplesRead==0 ){
				bIsPlaying=false;
				soundFile.seekTo(0);
			}
			else{
				buffer.stereoPan(volumesLeft.back(),volumesRight.back());
				newBufferE.notify(this,buffer);
				buffer.copyTo(outputBuffer);
			}
		}else{
  	        if (positions.size() == 1 && abs(speed - 1)<FLT_EPSILON) {
                buffer.copyTo(outputBuffer,nFrames,nChannels,positions[0],loop);
            }else{
                for(int i=0;i<(int)positions.size();i++){
                    //assert( resampledBuffer.getNumFrames() == bufferSize*relativeSpeed[i] );
                    if(abs(relativeSpeed[i] - 1)<FLT_EPSILON){
                        buffer.copyTo(resampledBuffer,nFrames,nChannels,positions[i],loop);
                    }else{
                    	buffer.resampleTo(resampledBuffer,positions[i],nFrames,relativeSpeed[i],loop, ofSoundBuffer::Linear);
                    }
                    resampledBuffer.stereoPan(volumesLeft[i],volumesRight[i]);
                    newBufferE.notify(this,resampledBuffer);
                    resampledBuffer.addTo(outputBuffer,0,loop);
                }
            }
			updatePositions(nFrames);
		}
	}
}