Chris@59: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@59: 
Chris@59: /*
Chris@59:     Sonic Visualiser
Chris@59:     An audio file viewer and annotation editor.
Chris@59:     Centre for Digital Music, Queen Mary, University of London.
Chris@59:     This file copyright 2006 Chris Cannam.
Chris@59:     
Chris@59:     This program is free software; you can redistribute it and/or
Chris@59:     modify it under the terms of the GNU General Public License as
Chris@59:     published by the Free Software Foundation; either version 2 of the
Chris@59:     License, or (at your option) any later version.  See the file
Chris@59:     COPYING included with this distribution for more information.
Chris@59: */
Chris@59: 
Chris@114: #ifdef HAVE_PORTAUDIO_2_0
Chris@59: 
Chris@59: #include "AudioPortAudioTarget.h"
Chris@59: #include "AudioCallbackPlaySource.h"
Chris@59: 
Chris@59: #include <iostream>
Chris@59: #include <cassert>
Chris@59: #include <cmath>
Chris@59: 
Chris@59: //#define DEBUG_AUDIO_PORT_AUDIO_TARGET 1
Chris@59: 
Chris@59: AudioPortAudioTarget::AudioPortAudioTarget(AudioCallbackPlaySource *source) :
Chris@59:     AudioCallbackPlayTarget(source),
Chris@59:     m_stream(0),
Chris@59:     m_bufferSize(0),
Chris@59:     m_sampleRate(0),
Chris@70:     m_latency(0),
Chris@70:     m_done(false)
Chris@59: {
Chris@59:     PaError err;
Chris@59: 
Chris@59: #ifdef DEBUG_AUDIO_PORT_AUDIO_TARGET
Chris@59:     std::cerr << "AudioPortAudioTarget: Initialising for PortAudio v19" << std::endl;
Chris@59: #endif
Chris@59: 
Chris@59:     err = Pa_Initialize();
Chris@59:     if (err != paNoError) {
Chris@59: 	std::cerr << "ERROR: AudioPortAudioTarget: Failed to initialize PortAudio: " << Pa_GetErrorText(err) << std::endl;
Chris@59: 	return;
Chris@59:     }
Chris@59: 
Chris@80:     m_bufferSize = 2048;
Chris@59:     m_sampleRate = 44100;
Chris@59:     if (m_source && (m_source->getSourceSampleRate() != 0)) {
Chris@59: 	m_sampleRate = m_source->getSourceSampleRate();
Chris@59:     }
Chris@59: 
Chris@81:     PaStreamParameters op;
Chris@96:     op.device = Pa_GetDefaultOutputDevice();
Chris@81:     op.channelCount = 2;
Chris@81:     op.sampleFormat = paFloat32;
Chris@81:     op.suggestedLatency = 0.2;
Chris@81:     op.hostApiSpecificStreamInfo = 0;
Chris@91:     err = Pa_OpenStream(&m_stream, 0, &op, m_sampleRate,
Chris@91:                         paFramesPerBufferUnspecified,
Chris@81:                         paNoFlag, processStatic, this);
Chris@59: 
Chris@95:     if (err != paNoError) {
Chris@95: 
Chris@95:         std::cerr << "WARNING: AudioPortAudioTarget: Failed to open PortAudio stream with default frames per buffer, trying again with fixed frames per buffer..." << std::endl;
Chris@95:         
Chris@95:         err = Pa_OpenStream(&m_stream, 0, &op, m_sampleRate,
Chris@95:                             1024,
Chris@95:                             paNoFlag, processStatic, this);
Chris@96: 	m_bufferSize = 1024;
Chris@95:     }
Chris@95: 
Chris@59:     if (err != paNoError) {
Chris@59: 	std::cerr << "ERROR: AudioPortAudioTarget: Failed to open PortAudio stream: " << Pa_GetErrorText(err) << std::endl;
Chris@59: 	m_stream = 0;
Chris@59: 	Pa_Terminate();
Chris@59: 	return;
Chris@59:     }
Chris@59: 
Chris@59:     const PaStreamInfo *info = Pa_GetStreamInfo(m_stream);
Chris@59:     m_latency = int(info->outputLatency * m_sampleRate + 0.001);
Chris@96:     if (m_bufferSize < m_latency) m_bufferSize = m_latency;
Chris@59: 
Chris@59:     std::cerr << "PortAudio latency = " << m_latency << " frames" << std::endl;
Chris@59: 
Chris@59:     err = Pa_StartStream(m_stream);
Chris@59: 
Chris@59:     if (err != paNoError) {
Chris@59: 	std::cerr << "ERROR: AudioPortAudioTarget: Failed to start PortAudio stream: " << Pa_GetErrorText(err) << std::endl;
Chris@59: 	Pa_CloseStream(m_stream);
Chris@59: 	m_stream = 0;
Chris@59: 	Pa_Terminate();
Chris@59: 	return;
Chris@59:     }
Chris@59: 
Chris@59:     if (m_source) {
Chris@59: 	std::cerr << "AudioPortAudioTarget: block size " << m_bufferSize << std::endl;
Chris@91: 	m_source->setTarget(this, m_bufferSize);
Chris@59: 	m_source->setTargetSampleRate(m_sampleRate);
Chris@59: 	m_source->setTargetPlayLatency(m_latency);
Chris@59:     }
Chris@59: 
Chris@59: #ifdef DEBUG_PORT_AUDIO_TARGET
Chris@59:     std::cerr << "AudioPortAudioTarget: initialised OK" << std::endl;
Chris@59: #endif
Chris@59: }
Chris@59: 
Chris@59: AudioPortAudioTarget::~AudioPortAudioTarget()
Chris@59: {
Chris@70:     std::cerr << "AudioPortAudioTarget::~AudioPortAudioTarget()" << std::endl;
Chris@70: 
Chris@91:     if (m_source) {
Chris@91:         m_source->setTarget(0, m_bufferSize);
Chris@91:     }
Chris@91: 
Chris@70:     shutdown();
Chris@70: 
Chris@59:     if (m_stream) {
Chris@70: 
Chris@70:         std::cerr << "closing stream" << std::endl;
Chris@70: 
Chris@59: 	PaError err;
Chris@59: 	err = Pa_CloseStream(m_stream);
Chris@59: 	if (err != paNoError) {
Chris@59: 	    std::cerr << "ERROR: AudioPortAudioTarget: Failed to close PortAudio stream: " << Pa_GetErrorText(err) << std::endl;
Chris@59: 	}
Chris@70: 
Chris@70:         std::cerr << "terminating" << std::endl;
Chris@70: 
Chris@59: 	err = Pa_Terminate();
Chris@59:         if (err != paNoError) {
Chris@59:             std::cerr << "ERROR: AudioPortAudioTarget: Failed to terminate PortAudio: " << Pa_GetErrorText(err) << std::endl;
Chris@59: 	}   
Chris@59:     }
Chris@70: 
Chris@70:     m_stream = 0;
Chris@70: 
Chris@70:     std::cerr << "AudioPortAudioTarget::~AudioPortAudioTarget() done" << std::endl;
Chris@70: }
Chris@70: 
Chris@70: void 
Chris@70: AudioPortAudioTarget::shutdown()
Chris@70: {
Chris@177: #ifdef DEBUG_PORT_AUDIO_TARGET
Chris@177:     std::cerr << "AudioPortAudioTarget::shutdown" << std::endl;
Chris@177: #endif
Chris@70:     m_done = true;
Chris@59: }
Chris@59: 
Chris@59: bool
Chris@59: AudioPortAudioTarget::isOK() const
Chris@59: {
Chris@59:     return (m_stream != 0);
Chris@59: }
Chris@59: 
Chris@91: double
Chris@91: AudioPortAudioTarget::getCurrentTime() const
Chris@91: {
Chris@91:     if (!m_stream) return 0.0;
Chris@91:     else return Pa_GetStreamTime(m_stream);
Chris@91: }
Chris@91: 
Chris@59: int
Chris@59: AudioPortAudioTarget::processStatic(const void *input, void *output,
Chris@59:                                     unsigned long nframes,
Chris@59:                                     const PaStreamCallbackTimeInfo *timeInfo,
Chris@59:                                     PaStreamCallbackFlags flags, void *data)
Chris@59: {
Chris@59:     return ((AudioPortAudioTarget *)data)->process(input, output,
Chris@59:                                                    nframes, timeInfo,
Chris@59:                                                    flags);
Chris@59: }
Chris@59: 
Chris@59: void
Chris@59: AudioPortAudioTarget::sourceModelReplaced()
Chris@59: {
Chris@59:     m_source->setTargetSampleRate(m_sampleRate);
Chris@59: }
Chris@59: 
Chris@59: int
Chris@59: AudioPortAudioTarget::process(const void *, void *outputBuffer,
Chris@59:                               unsigned long nframes,
Chris@59:                               const PaStreamCallbackTimeInfo *,
Chris@59:                               PaStreamCallbackFlags)
Chris@59: {
Chris@59: #ifdef DEBUG_AUDIO_PORT_AUDIO_TARGET    
Chris@177:     std::cerr << "AudioPortAudioTarget::process(" << nframes << ")" << std::endl;
Chris@59: #endif
Chris@59: 
Chris@177:     if (!m_source || m_done) {
Chris@177: #ifdef DEBUG_AUDIO_PORT_AUDIO_TARGET
Chris@177:         std::cerr << "AudioPortAudioTarget::process: Doing nothing, no source or application done" << std::endl;
Chris@177: #endif
Chris@177:         return 0;
Chris@177:     }
Chris@59: 
Chris@59:     float *output = (float *)outputBuffer;
Chris@59: 
Chris@59:     assert(nframes <= m_bufferSize);
Chris@59: 
Chris@59:     static float **tmpbuf = 0;
Chris@59:     static size_t tmpbufch = 0;
Chris@59:     static size_t tmpbufsz = 0;
Chris@59: 
Chris@59:     size_t sourceChannels = m_source->getSourceChannelCount();
Chris@59: 
Chris@59:     // Because we offer pan, we always want at least 2 channels
Chris@59:     if (sourceChannels < 2) sourceChannels = 2;
Chris@59: 
Chris@59:     if (!tmpbuf || tmpbufch != sourceChannels || int(tmpbufsz) < m_bufferSize) {
Chris@59: 
Chris@59: 	if (tmpbuf) {
Chris@59: 	    for (size_t i = 0; i < tmpbufch; ++i) {
Chris@59: 		delete[] tmpbuf[i];
Chris@59: 	    }
Chris@59: 	    delete[] tmpbuf;
Chris@59: 	}
Chris@59: 
Chris@59: 	tmpbufch = sourceChannels;
Chris@59: 	tmpbufsz = m_bufferSize;
Chris@59: 	tmpbuf = new float *[tmpbufch];
Chris@59: 
Chris@59: 	for (size_t i = 0; i < tmpbufch; ++i) {
Chris@59: 	    tmpbuf[i] = new float[tmpbufsz];
Chris@59: 	}
Chris@59:     }
Chris@59: 	
Chris@59:     size_t received = m_source->getSourceSamples(nframes, tmpbuf);
Chris@59: 
Chris@59:     float peakLeft = 0.0, peakRight = 0.0;
Chris@59: 
Chris@59:     for (size_t ch = 0; ch < 2; ++ch) {
Chris@59: 	
Chris@59: 	float peak = 0.0;
Chris@59: 
Chris@59: 	if (ch < sourceChannels) {
Chris@59: 
Chris@59: 	    // PortAudio samples are interleaved
Chris@59: 	    for (size_t i = 0; i < nframes; ++i) {
Chris@59:                 if (i < received) {
Chris@59:                     output[i * 2 + ch] = tmpbuf[ch][i] * m_outputGain;
Chris@59:                     float sample = fabsf(output[i * 2 + ch]);
Chris@59:                     if (sample > peak) peak = sample;
Chris@59:                 } else {
Chris@59:                     output[i * 2 + ch] = 0;
Chris@59:                 }
Chris@59: 	    }
Chris@59: 
Chris@59: 	} else if (ch == 1 && sourceChannels == 1) {
Chris@59: 
Chris@59: 	    for (size_t i = 0; i < nframes; ++i) {
Chris@59:                 if (i < received) {
Chris@59:                     output[i * 2 + ch] = tmpbuf[0][i] * m_outputGain;
Chris@59:                     float sample = fabsf(output[i * 2 + ch]);
Chris@59:                     if (sample > peak) peak = sample;
Chris@59:                 } else {
Chris@59:                     output[i * 2 + ch] = 0;
Chris@59:                 }
Chris@59: 	    }
Chris@59: 
Chris@59: 	} else {
Chris@59: 	    for (size_t i = 0; i < nframes; ++i) {
Chris@59: 		output[i * 2 + ch] = 0;
Chris@59: 	    }
Chris@59: 	}
Chris@59: 
Chris@59: 	if (ch == 0) peakLeft = peak;
Chris@59: 	if (ch > 0 || sourceChannels == 1) peakRight = peak;
Chris@59:     }
Chris@59: 
Chris@59:     m_source->setOutputLevels(peakLeft, peakRight);
Chris@59: 
Chris@130:     if (Pa_GetStreamCpuLoad(m_stream) > 0.7) {
Chris@130:         if (m_source) m_source->audioProcessingOverload();
Chris@130:     }
Chris@130: 
Chris@59:     return 0;
Chris@59: }
Chris@59: 
Chris@59: #endif /* HAVE_PORTAUDIO */
Chris@59: