diff audioio/AudioJACKTarget.cpp @ 0:cd5d7ff8ef38

* Reorganising code base.  This revision will not compile.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/audioio/AudioJACKTarget.cpp	Mon Jul 31 12:03:45 2006 +0000
@@ -0,0 +1,218 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifdef HAVE_JACK
+
+#include "AudioJACKTarget.h"
+#include "AudioCallbackPlaySource.h"
+
+#include <iostream>
+#include <cmath>
+
+//#define DEBUG_AUDIO_JACK_TARGET 1
+
+AudioJACKTarget::AudioJACKTarget(AudioCallbackPlaySource *source) :
+    AudioCallbackPlayTarget(source),
+    m_client(0),
+    m_bufferSize(0),
+    m_sampleRate(0)
+{
+    char name[20];
+    strcpy(name, "Sonic Visualiser");
+    m_client = jack_client_new(name);
+
+    if (!m_client) {
+	sprintf(name, "Sonic Visualiser (%d)", (int)getpid());
+	m_client = jack_client_new(name);
+	if (!m_client) {
+	    std::cerr
+		<< "ERROR: AudioJACKTarget: Failed to connect to JACK server"
+		<< std::endl;
+	}
+    }
+
+    if (!m_client) return;
+
+    m_bufferSize = jack_get_buffer_size(m_client);
+    m_sampleRate = jack_get_sample_rate(m_client);
+
+    jack_set_process_callback(m_client, processStatic, this);
+
+    if (jack_activate(m_client)) {
+	std::cerr << "ERROR: AudioJACKTarget: Failed to activate JACK client"
+		  << std::endl;
+    }
+
+    if (m_source) {
+	sourceModelReplaced();
+    }
+}
+
+AudioJACKTarget::~AudioJACKTarget()
+{
+    if (m_client) {
+	jack_deactivate(m_client);
+	jack_client_close(m_client);
+    }
+}
+
+bool
+AudioJACKTarget::isOK() const
+{
+    return (m_client != 0);
+}
+
+int
+AudioJACKTarget::processStatic(jack_nframes_t nframes, void *arg)
+{
+    return ((AudioJACKTarget *)arg)->process(nframes);
+}
+
+void
+AudioJACKTarget::sourceModelReplaced()
+{
+    m_mutex.lock();
+
+    m_source->setTargetBlockSize(m_bufferSize);
+    m_source->setTargetSampleRate(m_sampleRate);
+
+    size_t channels = m_source->getSourceChannelCount();
+
+    // Because we offer pan, we always want at least 2 channels
+    if (channels < 2) channels = 2;
+
+    if (channels == m_outputs.size() || !m_client) {
+	m_mutex.unlock();
+	return;
+    }
+
+    const char **ports =
+	jack_get_ports(m_client, NULL, NULL,
+		       JackPortIsPhysical | JackPortIsInput);
+    size_t physicalPortCount = 0;
+    while (ports[physicalPortCount]) ++physicalPortCount;
+
+#ifdef DEBUG_AUDIO_JACK_TARGET    
+    std::cerr << "AudioJACKTarget::sourceModelReplaced: have " << channels << " channels and " << physicalPortCount << " physical ports" << std::endl;
+#endif
+
+    while (m_outputs.size() < channels) {
+	
+	char name[20];
+	jack_port_t *port;
+
+	sprintf(name, "out %d", m_outputs.size() + 1);
+
+	port = jack_port_register(m_client,
+				  name,
+				  JACK_DEFAULT_AUDIO_TYPE,
+				  JackPortIsOutput,
+				  0);
+
+	if (!port) {
+	    std::cerr
+		<< "ERROR: AudioJACKTarget: Failed to create JACK output port "
+		<< m_outputs.size() << std::endl;
+	} else {
+	    m_source->setTargetPlayLatency(jack_port_get_latency(port));
+	}
+
+	if (m_outputs.size() < physicalPortCount) {
+	    jack_connect(m_client, jack_port_name(port), ports[m_outputs.size()]);
+	}
+
+	m_outputs.push_back(port);
+    }
+
+    while (m_outputs.size() > channels) {
+	std::vector<jack_port_t *>::iterator itr = m_outputs.end();
+	--itr;
+	jack_port_t *port = *itr;
+	if (port) jack_port_unregister(m_client, port);
+	m_outputs.erase(itr);
+    }
+
+    m_mutex.unlock();
+}
+
+int
+AudioJACKTarget::process(jack_nframes_t nframes)
+{
+    if (!m_mutex.tryLock()) {
+	return 0;
+    }
+
+    if (m_outputs.empty()) {
+	m_mutex.unlock();
+	return 0;
+    }
+
+#ifdef DEBUG_AUDIO_JACK_TARGET    
+    std::cout << "AudioJACKTarget::process(" << nframes << "): have a source" << std::endl;
+#endif
+
+#ifdef DEBUG_AUDIO_JACK_TARGET    
+    if (m_bufferSize != nframes) {
+	std::cerr << "WARNING: m_bufferSize != nframes (" << m_bufferSize << " != " << nframes << ")" << std::endl;
+    }
+#endif
+
+    float **buffers = (float **)alloca(m_outputs.size() * sizeof(float *));
+
+    for (size_t ch = 0; ch < m_outputs.size(); ++ch) {
+	buffers[ch] = (float *)jack_port_get_buffer(m_outputs[ch], nframes);
+    }
+
+    if (m_source) {
+	m_source->getSourceSamples(nframes, buffers);
+    } else {
+	for (size_t ch = 0; ch < m_outputs.size(); ++ch) {
+	    for (size_t i = 0; i < nframes; ++i) {
+		buffers[ch][i] = 0.0;
+	    }
+	}
+    }
+
+    float peakLeft = 0.0, peakRight = 0.0;
+
+    for (size_t ch = 0; ch < m_outputs.size(); ++ch) {
+
+	float peak = 0.0;
+
+	for (size_t i = 0; i < nframes; ++i) {
+	    buffers[ch][i] *= m_outputGain;
+	    float sample = fabsf(buffers[ch][i]);
+	    if (sample > peak) peak = sample;
+	}
+
+	if (ch == 0) peakLeft = peak;
+	if (ch > 0 || m_outputs.size() == 1) peakRight = peak;
+    }
+	    
+    if (m_source) {
+	m_source->setOutputLevels(peakLeft, peakRight);
+    }
+
+    m_mutex.unlock();
+    return 0;
+}
+
+
+#ifdef INCLUDE_MOCFILES
+#include "AudioJACKTarget.moc.cpp"
+#endif
+
+#endif /* HAVE_JACK */
+