Chris@19: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@0: 
Chris@0: /*
Chris@21:     Sonic Visualiser
Chris@21:     An audio file viewer and annotation editor.
Chris@21:     Centre for Digital Music, Queen Mary, University of London.
Chris@21:     This file copyright 2006 Chris Cannam.
Chris@0:     
Chris@21:     This program is free software; you can redistribute it and/or
Chris@21:     modify it under the terms of the GNU General Public License as
Chris@21:     published by the Free Software Foundation; either version 2 of the
Chris@21:     License, or (at your option) any later version.  See the file
Chris@21:     COPYING included with this distribution for more information.
Chris@0: */
Chris@0: 
Chris@0: #ifdef HAVE_PORTAUDIO
Chris@0: 
Chris@0: #include "AudioPortAudioTarget.h"
Chris@0: #include "AudioCallbackPlaySource.h"
Chris@0: 
Chris@0: #include <iostream>
Chris@0: #include <cassert>
Chris@0: #include <cmath>
Chris@0: 
Chris@0: //#define DEBUG_AUDIO_PORT_AUDIO_TARGET 1
Chris@0: 
Chris@0: AudioPortAudioTarget::AudioPortAudioTarget(AudioCallbackPlaySource *source) :
Chris@0:     AudioCallbackPlayTarget(source),
Chris@0:     m_stream(0),
Chris@0:     m_bufferSize(0),
Chris@0:     m_sampleRate(0),
Chris@0:     m_latency(0)
Chris@0: {
Chris@0:     PaError err;
Chris@0: 
Chris@0:     err = Pa_Initialize();
Chris@0:     if (err != paNoError) {
Chris@0: 	std::cerr << "ERROR: AudioPortAudioTarget: Failed to initialize PortAudio" << std::endl;
Chris@0: 	return;
Chris@0:     }
Chris@0: 
Chris@0:     m_bufferSize = 1024;
Chris@0:     m_sampleRate = 44100;
Chris@0:     if (m_source && (m_source->getSourceSampleRate() != 0)) {
Chris@0: 	m_sampleRate = m_source->getSourceSampleRate();
Chris@0:     }
Chris@0: 
Chris@0:     m_latency = Pa_GetMinNumBuffers(m_bufferSize, m_sampleRate) * m_bufferSize;
Chris@0: 
Chris@0:     err = Pa_OpenDefaultStream(&m_stream, 0, 2, paFloat32,
Chris@0: 			       m_sampleRate, m_bufferSize, 0,
Chris@0: 			       processStatic, this);
Chris@0: 
Chris@0:     if (err != paNoError) {
Chris@0: 	std::cerr << "ERROR: AudioPortAudioTarget: Failed to open PortAudio stream" << std::endl;
Chris@0: 	m_stream = 0;
Chris@0: 	Pa_Terminate();
Chris@0: 	return;
Chris@0:     }
Chris@0: 
Chris@0:     err = Pa_StartStream(m_stream);
Chris@0: 
Chris@0:     if (err != paNoError) {
Chris@0: 	std::cerr << "ERROR: AudioPortAudioTarget: Failed to start PortAudio stream" << std::endl;
Chris@0: 	Pa_CloseStream(m_stream);
Chris@0: 	m_stream = 0;
Chris@0: 	Pa_Terminate();
Chris@0: 	return;
Chris@0:     }
Chris@0: 
Chris@0:     if (m_source) {
Chris@0: 	std::cerr << "AudioPortAudioTarget: block size " << m_bufferSize << std::endl;
Chris@0: 	m_source->setTargetBlockSize(m_bufferSize);
Chris@0: 	m_source->setTargetSampleRate(m_sampleRate);
Chris@0: 	m_source->setTargetPlayLatency(m_latency);
Chris@0:     }
Chris@0: }
Chris@0: 
Chris@0: AudioPortAudioTarget::~AudioPortAudioTarget()
Chris@0: {
Chris@0:     if (m_stream) {
Chris@0: 	PaError err;
Chris@0: 	err = Pa_CloseStream(m_stream);
Chris@0: 	if (err != paNoError) {
Chris@0: 	    std::cerr << "ERROR: AudioPortAudioTarget: Failed to close PortAudio stream" << std::endl;
Chris@0: 	}
Chris@0: 	Pa_Terminate();
Chris@0:     }
Chris@0: }
Chris@0: 
Chris@0: bool
Chris@0: AudioPortAudioTarget::isOK() const
Chris@0: {
Chris@0:     return (m_stream != 0);
Chris@0: }
Chris@0: 
Chris@0: int
Chris@0: AudioPortAudioTarget::processStatic(void *input, void *output,
Chris@0: 				    unsigned long nframes,
Chris@0: 				    PaTimestamp outTime, void *data)
Chris@0: {
Chris@0:     return ((AudioPortAudioTarget *)data)->process(input, output,
Chris@0: 						   nframes, outTime);
Chris@0: }
Chris@0: 
Chris@0: void
Chris@0: AudioPortAudioTarget::sourceModelReplaced()
Chris@0: {
Chris@0:     m_source->setTargetSampleRate(m_sampleRate);
Chris@0: }
Chris@0: 
Chris@0: int
Chris@0: AudioPortAudioTarget::process(void *inputBuffer, void *outputBuffer,
Chris@0: 			      unsigned long nframes,
Chris@0: 			      PaTimestamp)
Chris@0: {
Chris@0: #ifdef DEBUG_AUDIO_PORT_AUDIO_TARGET    
Chris@0:     std::cout << "AudioPortAudioTarget::process(" << nframes << ")" << std::endl;
Chris@0: #endif
Chris@0: 
Chris@0:     if (!m_source) return 0;
Chris@0: 
Chris@0:     float *output = (float *)outputBuffer;
Chris@0: 
Chris@0:     assert(nframes <= m_bufferSize);
Chris@0: 
Chris@0:     static float **tmpbuf = 0;
Chris@0:     static size_t tmpbufch = 0;
Chris@0:     static size_t tmpbufsz = 0;
Chris@0: 
Chris@0:     size_t sourceChannels = m_source->getSourceChannelCount();
Chris@0: 
Chris@16:     // Because we offer pan, we always want at least 2 channels
Chris@16:     if (sourceChannels < 2) sourceChannels = 2;
Chris@16: 
Chris@0:     if (!tmpbuf || tmpbufch != sourceChannels || tmpbufsz < m_bufferSize) {
Chris@0: 
Chris@0: 	if (tmpbuf) {
Chris@0: 	    for (size_t i = 0; i < tmpbufch; ++i) {
Chris@0: 		delete[] tmpbuf[i];
Chris@0: 	    }
Chris@0: 	    delete[] tmpbuf;
Chris@0: 	}
Chris@0: 
Chris@0: 	tmpbufch = sourceChannels;
Chris@0: 	tmpbufsz = m_bufferSize;
Chris@0: 	tmpbuf = new float *[tmpbufch];
Chris@0: 
Chris@0: 	for (size_t i = 0; i < tmpbufch; ++i) {
Chris@0: 	    tmpbuf[i] = new float[tmpbufsz];
Chris@0: 	}
Chris@0:     }
Chris@0: 	
Chris@0:     m_source->getSourceSamples(nframes, tmpbuf);
Chris@0: 
Chris@0:     float peakLeft = 0.0, peakRight = 0.0;
Chris@0: 
Chris@0:     for (size_t ch = 0; ch < 2; ++ch) {
Chris@0: 	
Chris@0: 	float peak = 0.0;
Chris@0: 
Chris@0: 	if (ch < sourceChannels) {
Chris@0: 
Chris@0: 	    // PortAudio samples are interleaved
Chris@0: 	    for (size_t i = 0; i < nframes; ++i) {
Chris@0: 		output[i * 2 + ch] = tmpbuf[ch][i] * m_outputGain;
Chris@0: 		float sample = fabsf(output[i * 2 + ch]);
Chris@0: 		if (sample > peak) peak = sample;
Chris@0: 	    }
Chris@0: 
Chris@0: 	} else if (ch == 1 && sourceChannels == 1) {
Chris@0: 
Chris@0: 	    for (size_t i = 0; i < nframes; ++i) {
Chris@0: 		output[i * 2 + ch] = tmpbuf[0][i] * m_outputGain;
Chris@0: 		float sample = fabsf(output[i * 2 + ch]);
Chris@0: 		if (sample > peak) peak = sample;
Chris@0: 	    }
Chris@0: 
Chris@0: 	} else {
Chris@0: 	    for (size_t i = 0; i < nframes; ++i) {
Chris@0: 		output[i * 2 + ch] = 0;
Chris@0: 	    }
Chris@0: 	}
Chris@0: 
Chris@0: 	if (ch == 0) peakLeft = peak;
Chris@0: 	if (ch > 0 || sourceChannels == 1) peakRight = peak;
Chris@0:     }
Chris@0: 
Chris@0:     m_source->setOutputLevels(peakLeft, peakRight);
Chris@0: 
Chris@0:     return 0;
Chris@0: }
Chris@0: 
Chris@0: #ifdef INCLUDE_MOCFILES
Chris@0: #include "AudioPortAudioTarget.moc.cpp"
Chris@0: #endif
Chris@0: 
Chris@0: #endif /* HAVE_PORTAUDIO */
Chris@0: