JUCE/src/audio/devices/juce_AudioDeviceManager.cpp

/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-9 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#include "../../core/juce_StandardHeader.h"

BEGIN_JUCE_NAMESPACE

#include "juce_AudioDeviceManager.h"
#include "../../gui/components/juce_Desktop.h"
#include "../../text/juce_LocalisedStrings.h"
#include "../dsp/juce_AudioSampleBuffer.h"


//==============================================================================
AudioDeviceManager::AudioDeviceSetup::AudioDeviceSetup()
    : sampleRate (0),
      bufferSize (0),
      useDefaultInputChannels (true),
      useDefaultOutputChannels (true)
{
}

bool AudioDeviceManager::AudioDeviceSetup::operator== (const AudioDeviceManager::AudioDeviceSetup& other) const
{
    return outputDeviceName == other.outputDeviceName
            && inputDeviceName == other.inputDeviceName
            && sampleRate == other.sampleRate
            && bufferSize == other.bufferSize
            && inputChannels == other.inputChannels
            && useDefaultInputChannels == other.useDefaultInputChannels
            && outputChannels == other.outputChannels
            && useDefaultOutputChannels == other.useDefaultOutputChannels;
}

//==============================================================================
AudioDeviceManager::AudioDeviceManager()
    : currentAudioDevice (0),
      numInputChansNeeded (0),
      numOutputChansNeeded (2),
      lastExplicitSettings (0),
      listNeedsScanning (true),
      useInputNames (false),
      inputLevelMeasurementEnabledCount (0),
      inputLevel (0),
      testSound (0),
      tempBuffer (2, 2),
      enabledMidiInputs (4),
      midiCallbacks (4),
      midiCallbackDevices (4),
      defaultMidiOutput (0),
      cpuUsageMs (0),
      timeToCpuScale (0)
{
    callbackHandler.owner = this;
}

AudioDeviceManager::~AudioDeviceManager()
{
    deleteAndZero (currentAudioDevice);
    deleteAndZero (defaultMidiOutput);
    delete lastExplicitSettings;
    delete testSound;
}


//==============================================================================
void AudioDeviceManager::createDeviceTypesIfNeeded()
{
    if (availableDeviceTypes.size() == 0)
    {
        createAudioDeviceTypes (availableDeviceTypes);

        while (lastDeviceTypeConfigs.size() < availableDeviceTypes.size())
            lastDeviceTypeConfigs.add (new AudioDeviceSetup());

        if (availableDeviceTypes.size() > 0)
            currentDeviceType = availableDeviceTypes.getUnchecked(0)->getTypeName();
    }
}

const OwnedArray <AudioIODeviceType>& AudioDeviceManager::getAvailableDeviceTypes()
{
    scanDevicesIfNeeded();
    return availableDeviceTypes;
}

//==============================================================================
extern AudioIODeviceType* juce_createDefaultAudioIODeviceType();

#if JUCE_WIN32 && JUCE_ASIO
  extern AudioIODeviceType* juce_createASIOAudioIODeviceType();
#endif

#if JUCE_WIN32 && JUCE_WDM_AUDIO
  extern AudioIODeviceType* juce_createWDMAudioIODeviceType();
#endif

void AudioDeviceManager::createAudioDeviceTypes (OwnedArray <AudioIODeviceType>& list)
{
    AudioIODeviceType* const defaultDeviceType = juce_createDefaultAudioIODeviceType();

    if (defaultDeviceType != 0)
        list.add (defaultDeviceType);

#if JUCE_WIN32 && JUCE_ASIO
    list.add (juce_createASIOAudioIODeviceType());
#endif

#if JUCE_WIN32 && JUCE_WDM_AUDIO
    list.add (juce_createWDMAudioIODeviceType());
#endif
}

//==============================================================================
const String AudioDeviceManager::initialise (const int numInputChannelsNeeded,
                                             const int numOutputChannelsNeeded,
                                             const XmlElement* const e,
                                             const bool selectDefaultDeviceOnFailure,
                                             const String& preferredDefaultDeviceName,
                                             const AudioDeviceSetup* preferredSetupOptions)
{
    scanDevicesIfNeeded();

    numInputChansNeeded = numInputChannelsNeeded;
    numOutputChansNeeded = numOutputChannelsNeeded;

    if (e != 0 && e->hasTagName (T("DEVICESETUP")))
    {
        delete lastExplicitSettings;
        lastExplicitSettings = new XmlElement (*e);

        String error;
        AudioDeviceSetup setup;

        if (preferredSetupOptions != 0)
            setup = *preferredSetupOptions;

        if (e->getStringAttribute (T("audioDeviceName")).isNotEmpty())
        {
            setup.inputDeviceName = setup.outputDeviceName
                = e->getStringAttribute (T("audioDeviceName"));
        }
        else
        {
            setup.inputDeviceName = e->getStringAttribute (T("audioInputDeviceName"));
            setup.outputDeviceName = e->getStringAttribute (T("audioOutputDeviceName"));
        }

        currentDeviceType = e->getStringAttribute (T("deviceType"));
        if (currentDeviceType.isEmpty())
        {
            AudioIODeviceType* const type = findType (setup.inputDeviceName, setup.outputDeviceName);

            if (type != 0)
                currentDeviceType = type->getTypeName();
            else if (availableDeviceTypes.size() > 0)
                currentDeviceType = availableDeviceTypes[0]->getTypeName();
        }

        setup.bufferSize = e->getIntAttribute (T("audioDeviceBufferSize"));
        setup.sampleRate = e->getDoubleAttribute (T("audioDeviceRate"));

        setup.inputChannels.parseString (e->getStringAttribute (T("audioDeviceInChans"), T("11")), 2);
        setup.outputChannels.parseString (e->getStringAttribute (T("audioDeviceOutChans"), T("11")), 2);

        setup.useDefaultInputChannels = ! e->hasAttribute (T("audioDeviceInChans"));
        setup.useDefaultOutputChannels = ! e->hasAttribute (T("audioDeviceOutChans"));

        error = setAudioDeviceSetup (setup, true);

        midiInsFromXml.clear();
        forEachXmlChildElementWithTagName (*e, c, T("MIDIINPUT"))
            midiInsFromXml.add (c->getStringAttribute (T("name")));

        const StringArray allMidiIns (MidiInput::getDevices());

        for (int i = allMidiIns.size(); --i >= 0;)
            setMidiInputEnabled (allMidiIns[i], midiInsFromXml.contains (allMidiIns[i]));

        if (error.isNotEmpty() && selectDefaultDeviceOnFailure)
            error = initialise (numInputChannelsNeeded, numOutputChannelsNeeded, 0,
                                false, preferredDefaultDeviceName);

        setDefaultMidiOutput (e->getStringAttribute (T("defaultMidiOutput")));

        return error;
    }
    else
    {
        AudioDeviceSetup setup;

        if (preferredSetupOptions != 0)
        {
            setup = *preferredSetupOptions;
        }
        else if (preferredDefaultDeviceName.isNotEmpty())
        {
            for (int j = availableDeviceTypes.size(); --j >= 0;)
            {
                AudioIODeviceType* const type = availableDeviceTypes.getUnchecked(j);

                StringArray outs (type->getDeviceNames (false));

                int i;
                for (i = 0; i < outs.size(); ++i)
                {
                    if (outs[i].matchesWildcard (preferredDefaultDeviceName, true))
                    {
                        setup.outputDeviceName = outs[i];
                        break;
                    }
                }

                StringArray ins (type->getDeviceNames (true));

                for (i = 0; i < ins.size(); ++i)
                {
                    if (ins[i].matchesWildcard (preferredDefaultDeviceName, true))
                    {
                        setup.inputDeviceName = ins[i];
                        break;
                    }
                }
            }
        }

        insertDefaultDeviceNames (setup);
        return setAudioDeviceSetup (setup, false);
    }
}

void AudioDeviceManager::insertDefaultDeviceNames (AudioDeviceSetup& setup) const
{
    AudioIODeviceType* type = getCurrentDeviceTypeObject();
    if (type != 0)
    {
        if (setup.outputDeviceName.isEmpty())
            setup.outputDeviceName = type->getDeviceNames (false) [type->getDefaultDeviceIndex (false)];

        if (setup.inputDeviceName.isEmpty())
            setup.inputDeviceName = type->getDeviceNames (true) [type->getDefaultDeviceIndex (true)];
    }
}

XmlElement* AudioDeviceManager::createStateXml() const
{
    return lastExplicitSettings != 0 ? new XmlElement (*lastExplicitSettings) : 0;
}

//==============================================================================
void AudioDeviceManager::scanDevicesIfNeeded()
{
    if (listNeedsScanning)
    {
        listNeedsScanning = false;

        createDeviceTypesIfNeeded();

        for (int i = availableDeviceTypes.size(); --i >= 0;)
            availableDeviceTypes.getUnchecked(i)->scanForDevices();
    }
}

AudioIODeviceType* AudioDeviceManager::findType (const String& inputName, const String& outputName)
{
    scanDevicesIfNeeded();

    for (int i = availableDeviceTypes.size(); --i >= 0;)
    {
        AudioIODeviceType* const type = availableDeviceTypes.getUnchecked(i);

        if ((inputName.isNotEmpty() && type->getDeviceNames (true).contains (inputName, true))
            || (outputName.isNotEmpty() && type->getDeviceNames (false).contains (outputName, true)))
        {
            return type;
        }
    }

    return 0;
}

void AudioDeviceManager::getAudioDeviceSetup (AudioDeviceSetup& setup)
{
    setup = currentSetup;
}

void AudioDeviceManager::deleteCurrentDevice()
{
    deleteAndZero (currentAudioDevice);
    currentSetup.inputDeviceName = String::empty;
    currentSetup.outputDeviceName = String::empty;
}

void AudioDeviceManager::setCurrentAudioDeviceType (const String& type,
                                                    const bool treatAsChosenDevice)
{
    for (int i = 0; i < availableDeviceTypes.size(); ++i)
    {
        if (availableDeviceTypes.getUnchecked(i)->getTypeName() == type
             && currentDeviceType != type)
        {
            currentDeviceType = type;

            AudioDeviceSetup s (*lastDeviceTypeConfigs.getUnchecked(i));
            insertDefaultDeviceNames (s);

            setAudioDeviceSetup (s, treatAsChosenDevice);

            sendChangeMessage (this);
            break;
        }
    }
}

AudioIODeviceType* AudioDeviceManager::getCurrentDeviceTypeObject() const
{
    for (int i = 0; i < availableDeviceTypes.size(); ++i)
        if (availableDeviceTypes[i]->getTypeName() == currentDeviceType)
            return availableDeviceTypes[i];

    return availableDeviceTypes[0];
}

const String AudioDeviceManager::setAudioDeviceSetup (const AudioDeviceSetup& newSetup,
                                                      const bool treatAsChosenDevice)
{
    jassert (&newSetup != &currentSetup);    // this will have no effect

    if (newSetup == currentSetup && currentAudioDevice != 0)
        return String::empty;

    if (! (newSetup == currentSetup))
        sendChangeMessage (this);

    stopDevice();
    String error;
    AudioIODeviceType* type = getCurrentDeviceTypeObject();

    if (type == 0 || (newSetup.inputDeviceName.isEmpty()
                       && newSetup.outputDeviceName.isEmpty()))
    {
        deleteCurrentDevice();

        if (treatAsChosenDevice)
            updateXml();

        return String::empty;
    }

    const String newInputDeviceName (numInputChansNeeded == 0 ? String::empty : newSetup.inputDeviceName);
    const String newOutputDeviceName (numOutputChansNeeded == 0 ? String::empty : newSetup.outputDeviceName);

    if (currentSetup.inputDeviceName != newInputDeviceName
         || currentSetup.outputDeviceName != newOutputDeviceName
         || currentAudioDevice == 0)
    {
        deleteCurrentDevice();
        scanDevicesIfNeeded();

        if (newOutputDeviceName.isNotEmpty()
             && ! type->getDeviceNames (false).contains (newOutputDeviceName))
        {
            return "No such device: " + newOutputDeviceName;
        }

        if (newInputDeviceName.isNotEmpty()
             && ! type->getDeviceNames (true).contains (newInputDeviceName))
        {
            return "No such device: " + newInputDeviceName;
        }

        currentAudioDevice = type->createDevice (newOutputDeviceName, newInputDeviceName);

        if (currentAudioDevice == 0)
            error = "Can't open the audio device!\n\nThis may be because another application is currently using the same device - if so, you should close any other applications and try again!";
        else
            error = currentAudioDevice->getLastError();

        if (error.isNotEmpty())
        {
            deleteCurrentDevice();
            return error;
        }

        if (newSetup.useDefaultInputChannels)
        {
            inputChannels.clear();
            inputChannels.setRange (0, numInputChansNeeded, true);
        }

        if (newSetup.useDefaultOutputChannels)
        {
            outputChannels.clear();
            outputChannels.setRange (0, numOutputChansNeeded, true);
        }

        if (newInputDeviceName.isEmpty())
            inputChannels.clear();

        if (newOutputDeviceName.isEmpty())
            outputChannels.clear();
    }

    if (! newSetup.useDefaultInputChannels)
        inputChannels = newSetup.inputChannels;

    if (! newSetup.useDefaultOutputChannels)
        outputChannels = newSetup.outputChannels;

    currentSetup = newSetup;

    currentSetup.sampleRate = chooseBestSampleRate (newSetup.sampleRate);

    error = currentAudioDevice->open (inputChannels,
                                      outputChannels,
                                      currentSetup.sampleRate,
                                      currentSetup.bufferSize);

    if (error.isEmpty())
    {
        currentDeviceType = currentAudioDevice->getTypeName();

        currentAudioDevice->start (&callbackHandler);

        currentSetup.sampleRate = currentAudioDevice->getCurrentSampleRate();
        currentSetup.bufferSize = currentAudioDevice->getCurrentBufferSizeSamples();
        currentSetup.inputChannels = currentAudioDevice->getActiveInputChannels();
        currentSetup.outputChannels = currentAudioDevice->getActiveOutputChannels();

        for (int i = 0; i < availableDeviceTypes.size(); ++i)
            if (availableDeviceTypes.getUnchecked (i)->getTypeName() == currentDeviceType)
                *(lastDeviceTypeConfigs.getUnchecked (i)) = currentSetup;

        if (treatAsChosenDevice)
            updateXml();
    }
    else
    {
        deleteCurrentDevice();
    }

    return error;
}

double AudioDeviceManager::chooseBestSampleRate (double rate) const
{
    jassert (currentAudioDevice != 0);

    if (rate > 0)
    {
        bool ok = false;

        for (int i = currentAudioDevice->getNumSampleRates(); --i >= 0;)
        {
            const double sr = currentAudioDevice->getSampleRate (i);

            if (sr == rate)
                ok = true;
        }

        if (! ok)
            rate = 0;
    }

    if (rate == 0)
    {
        double lowestAbove44 = 0.0;

        for (int i = currentAudioDevice->getNumSampleRates(); --i >= 0;)
        {
            const double sr = currentAudioDevice->getSampleRate (i);

            if (sr >= 44100.0 && (lowestAbove44 == 0 || sr < lowestAbove44))
                lowestAbove44 = sr;
        }

        if (lowestAbove44 == 0.0)
            rate = currentAudioDevice->getSampleRate (0);
        else
            rate = lowestAbove44;
    }

    return rate;
}

void AudioDeviceManager::stopDevice()
{
    if (currentAudioDevice != 0)
        currentAudioDevice->stop();
}

void AudioDeviceManager::closeAudioDevice()
{
    stopDevice();
    deleteAndZero (currentAudioDevice);
}

void AudioDeviceManager::restartLastAudioDevice()
{
    if (currentAudioDevice == 0)
    {
        if (currentSetup.inputDeviceName.isEmpty()
              && currentSetup.outputDeviceName.isEmpty())
        {
            // This method will only reload the last device that was running
            // before closeAudioDevice() was called - you need to actually open
            // one first, with setAudioDevice().
            jassertfalse
            return;
        }

        AudioDeviceSetup s (currentSetup);
        setAudioDeviceSetup (s, false);
    }
}

void AudioDeviceManager::updateXml()
{
    delete lastExplicitSettings;
    lastExplicitSettings = new XmlElement (T("DEVICESETUP"));

    lastExplicitSettings->setAttribute (T("deviceType"), currentDeviceType);
    lastExplicitSettings->setAttribute (T("audioOutputDeviceName"), currentSetup.outputDeviceName);
    lastExplicitSettings->setAttribute (T("audioInputDeviceName"), currentSetup.inputDeviceName);

    if (currentAudioDevice != 0)
    {
        lastExplicitSettings->setAttribute (T("audioDeviceRate"), currentAudioDevice->getCurrentSampleRate());

        if (currentAudioDevice->getDefaultBufferSize() != currentAudioDevice->getCurrentBufferSizeSamples())
            lastExplicitSettings->setAttribute (T("audioDeviceBufferSize"), currentAudioDevice->getCurrentBufferSizeSamples());

        if (! currentSetup.useDefaultInputChannels)
            lastExplicitSettings->setAttribute (T("audioDeviceInChans"), currentSetup.inputChannels.toString (2));

        if (! currentSetup.useDefaultOutputChannels)
            lastExplicitSettings->setAttribute (T("audioDeviceOutChans"), currentSetup.outputChannels.toString (2));
    }

    for (int i = 0; i < enabledMidiInputs.size(); ++i)
    {
        XmlElement* const m = new XmlElement (T("MIDIINPUT"));
        m->setAttribute (T("name"), enabledMidiInputs[i]->getName());

        lastExplicitSettings->addChildElement (m);
    }

    if (midiInsFromXml.size() > 0)
    {
        // Add any midi devices that have been enabled before, but which aren't currently
        // open because the device has been disconnected.
        const StringArray availableMidiDevices (MidiInput::getDevices());

        for (int i = 0; i < midiInsFromXml.size(); ++i)
        {
            if (! availableMidiDevices.contains (midiInsFromXml[i], true))
            {
                XmlElement* const m = new XmlElement (T("MIDIINPUT"));
                m->setAttribute (T("name"), midiInsFromXml[i]);

                lastExplicitSettings->addChildElement (m);
            }
        }
    }

    if (defaultMidiOutputName.isNotEmpty())
        lastExplicitSettings->setAttribute (T("defaultMidiOutput"), defaultMidiOutputName);
}

//==============================================================================
void AudioDeviceManager::addAudioCallback (AudioIODeviceCallback* newCallback)
{
    {
        const ScopedLock sl (audioCallbackLock);
        if (callbacks.contains (newCallback))
            return;
    }

    if (currentAudioDevice != 0 && newCallback != 0)
        newCallback->audioDeviceAboutToStart (currentAudioDevice);

    const ScopedLock sl (audioCallbackLock);
    callbacks.add (newCallback);
}

void AudioDeviceManager::removeAudioCallback (AudioIODeviceCallback* callback)
{
    if (callback != 0)
    {
        bool needsDeinitialising = currentAudioDevice != 0;

        {
            const ScopedLock sl (audioCallbackLock);

            needsDeinitialising = needsDeinitialising && callbacks.contains (callback);
            callbacks.removeValue (callback);
        }

        if (needsDeinitialising)
            callback->audioDeviceStopped();
    }
}

void AudioDeviceManager::audioDeviceIOCallbackInt (const float** inputChannelData,
                                                   int numInputChannels,
                                                   float** outputChannelData,
                                                   int numOutputChannels,
                                                   int numSamples)
{
    const ScopedLock sl (audioCallbackLock);

    if (inputLevelMeasurementEnabledCount > 0)
    {
        for (int j = 0; j < numSamples; ++j)
        {
            float s = 0;

            for (int i = 0; i < numInputChannels; ++i)
                s += fabsf (inputChannelData[i][j]);

            s /= numInputChannels;

            const double decayFactor = 0.99992;

            if (s > inputLevel)
                inputLevel = s;
            else if (inputLevel > 0.001f)
                inputLevel *= decayFactor;
            else
                inputLevel = 0;
        }
    }

    if (callbacks.size() > 0)
    {
        const double callbackStartTime = Time::getMillisecondCounterHiRes();

        tempBuffer.setSize (jmax (1, numOutputChannels), jmax (1, numSamples), false, false, true);

        callbacks.getUnchecked(0)->audioDeviceIOCallback (inputChannelData, numInputChannels,
                                                          outputChannelData, numOutputChannels, numSamples);

        float** const tempChans = tempBuffer.getArrayOfChannels();

        for (int i = callbacks.size(); --i > 0;)
        {
            callbacks.getUnchecked(i)->audioDeviceIOCallback (inputChannelData, numInputChannels,
                                                              tempChans, numOutputChannels, numSamples);

            for (int chan = 0; chan < numOutputChannels; ++chan)
            {
                const float* const src = tempChans [chan];
                float* const dst = outputChannelData [chan];

                if (src != 0 && dst != 0)
                    for (int j = 0; j < numSamples; ++j)
                        dst[j] += src[j];
            }
        }

        const double msTaken = Time::getMillisecondCounterHiRes() - callbackStartTime;
        const double filterAmount = 0.2;
        cpuUsageMs += filterAmount * (msTaken - cpuUsageMs);
    }
    else
    {
        for (int i = 0; i < numOutputChannels; ++i)
            zeromem (outputChannelData[i], sizeof (float) * numSamples);
    }

    if (testSound != 0)
    {
        const int numSamps = jmin (numSamples, testSound->getNumSamples() - testSoundPosition);
        const float* const src = testSound->getSampleData (0, testSoundPosition);

        for (int i = 0; i < numOutputChannels; ++i)
            for (int j = 0; j < numSamps; ++j)
                outputChannelData [i][j] += src[j];

        testSoundPosition += numSamps;
        if (testSoundPosition >= testSound->getNumSamples())
        {
            delete testSound;
            testSound = 0;
        }
    }
}

void AudioDeviceManager::audioDeviceAboutToStartInt (AudioIODevice* const device)
{
    cpuUsageMs = 0;

    const double sampleRate = device->getCurrentSampleRate();
    const int blockSize = device->getCurrentBufferSizeSamples();

    if (sampleRate > 0.0 && blockSize > 0)
    {
        const double msPerBlock = 1000.0 * blockSize / sampleRate;
        timeToCpuScale = (msPerBlock > 0.0) ? (1.0 / msPerBlock) : 0.0;
    }

    {
        const ScopedLock sl (audioCallbackLock);
        for (int i = callbacks.size(); --i >= 0;)
            callbacks.getUnchecked(i)->audioDeviceAboutToStart (device);
    }

    sendChangeMessage (this);
}

void AudioDeviceManager::audioDeviceStoppedInt()
{
    cpuUsageMs = 0;
    timeToCpuScale = 0;
    sendChangeMessage (this);

    const ScopedLock sl (audioCallbackLock);
    for (int i = callbacks.size(); --i >= 0;)
        callbacks.getUnchecked(i)->audioDeviceStopped();
}

double AudioDeviceManager::getCpuUsage() const
{
    return jlimit (0.0, 1.0, timeToCpuScale * cpuUsageMs);
}

//==============================================================================
void AudioDeviceManager::setMidiInputEnabled (const String& name,
                                              const bool enabled)
{
    if (enabled != isMidiInputEnabled (name))
    {
        if (enabled)
        {
            const int index = MidiInput::getDevices().indexOf (name);

            if (index >= 0)
            {
                MidiInput* const min = MidiInput::openDevice (index, &callbackHandler);

                if (min != 0)
                {
                    enabledMidiInputs.add (min);
                    min->start();
                }
            }
        }
        else
        {
            for (int i = enabledMidiInputs.size(); --i >= 0;)
                if (enabledMidiInputs[i]->getName() == name)
                    enabledMidiInputs.remove (i);
        }

        updateXml();
        sendChangeMessage (this);
    }
}

bool AudioDeviceManager::isMidiInputEnabled (const String& name) const
{
    for (int i = enabledMidiInputs.size(); --i >= 0;)
        if (enabledMidiInputs[i]->getName() == name)
            return true;

    return false;
}

void AudioDeviceManager::addMidiInputCallback (const String& name,
                                               MidiInputCallback* callback)
{
    removeMidiInputCallback (name, callback);

    if (name.isEmpty())
    {
        midiCallbacks.add (callback);
        midiCallbackDevices.add (0);
    }
    else
    {
        for (int i = enabledMidiInputs.size(); --i >= 0;)
        {
            if (enabledMidiInputs[i]->getName() == name)
            {
                const ScopedLock sl (midiCallbackLock);
                midiCallbacks.add (callback);
                midiCallbackDevices.add (enabledMidiInputs[i]);
                break;
            }
        }
    }
}

void AudioDeviceManager::removeMidiInputCallback (const String& name,
                                                  MidiInputCallback* /*callback*/)
{
    const ScopedLock sl (midiCallbackLock);

    for (int i = midiCallbacks.size(); --i >= 0;)
    {
        String devName;

        if (midiCallbackDevices.getUnchecked(i) != 0)
            devName = midiCallbackDevices.getUnchecked(i)->getName();

        if (devName == name)
        {
            midiCallbacks.remove (i);
            midiCallbackDevices.remove (i);
        }
    }
}

void AudioDeviceManager::handleIncomingMidiMessageInt (MidiInput* source,
                                                       const MidiMessage& message)
{
    if (! message.isActiveSense())
    {
        const bool isDefaultSource = (source == 0 || source == enabledMidiInputs.getFirst());

        const ScopedLock sl (midiCallbackLock);

        for (int i = midiCallbackDevices.size(); --i >= 0;)
        {
            MidiInput* const md = midiCallbackDevices.getUnchecked(i);

            if (md == source || (md == 0 && isDefaultSource))
                midiCallbacks.getUnchecked(i)->handleIncomingMidiMessage (source, message);
        }
    }
}

//==============================================================================
void AudioDeviceManager::setDefaultMidiOutput (const String& deviceName)
{
    if (defaultMidiOutputName != deviceName)
    {
        SortedSet <AudioIODeviceCallback*> oldCallbacks;

        {
            const ScopedLock sl (audioCallbackLock);
            oldCallbacks = callbacks;
            callbacks.clear();
        }

        if (currentAudioDevice != 0)
            for (int i = oldCallbacks.size(); --i >= 0;)
                oldCallbacks.getUnchecked(i)->audioDeviceStopped();

        deleteAndZero (defaultMidiOutput);
        defaultMidiOutputName = deviceName;

        if (deviceName.isNotEmpty())
            defaultMidiOutput = MidiOutput::openDevice (MidiOutput::getDevices().indexOf (deviceName));

        if (currentAudioDevice != 0)
            for (int i = oldCallbacks.size(); --i >= 0;)
                oldCallbacks.getUnchecked(i)->audioDeviceAboutToStart (currentAudioDevice);

        {
            const ScopedLock sl (audioCallbackLock);
            callbacks = oldCallbacks;
        }

        updateXml();
        sendChangeMessage (this);
    }
}

//==============================================================================
void AudioDeviceManager::CallbackHandler::audioDeviceIOCallback (const float** inputChannelData,
                                                                 int numInputChannels,
                                                                 float** outputChannelData,
                                                                 int numOutputChannels,
                                                                 int numSamples)
{
    owner->audioDeviceIOCallbackInt (inputChannelData, numInputChannels, outputChannelData, numOutputChannels, numSamples);
}

void AudioDeviceManager::CallbackHandler::audioDeviceAboutToStart (AudioIODevice* device)
{
    owner->audioDeviceAboutToStartInt (device);
}

void AudioDeviceManager::CallbackHandler::audioDeviceStopped()
{
    owner->audioDeviceStoppedInt();
}

void AudioDeviceManager::CallbackHandler::handleIncomingMidiMessage (MidiInput* source, const MidiMessage& message)
{
    owner->handleIncomingMidiMessageInt (source, message);
}

//==============================================================================
void AudioDeviceManager::playTestSound()
{
    audioCallbackLock.enter();
    AudioSampleBuffer* oldSound = testSound;
    testSound = 0;
    audioCallbackLock.exit();
    delete oldSound;

    testSoundPosition = 0;

    if (currentAudioDevice != 0)
    {
        const double sampleRate = currentAudioDevice->getCurrentSampleRate();
        const int soundLength = (int) sampleRate;

        AudioSampleBuffer* const newSound = new AudioSampleBuffer (1, soundLength);
        float* samples = newSound->getSampleData (0);

        const double frequency = MidiMessage::getMidiNoteInHertz (80);
        const float amplitude = 0.5f;

        const double phasePerSample = double_Pi * 2.0 / (sampleRate / frequency);

        for (int i = 0; i < soundLength; ++i)
            samples[i] = amplitude * (float) sin (i * phasePerSample);

        newSound->applyGainRamp (0, 0, soundLength / 10, 0.0f, 1.0f);
        newSound->applyGainRamp (0, soundLength - soundLength / 4, soundLength / 4, 1.0f, 0.0f);

        const ScopedLock sl (audioCallbackLock);
        testSound = newSound;
    }
}

void AudioDeviceManager::enableInputLevelMeasurement (const bool enableMeasurement)
{
    const ScopedLock sl (audioCallbackLock);

    if (enableMeasurement)
        ++inputLevelMeasurementEnabledCount;
    else
        --inputLevelMeasurementEnabledCount;

    inputLevel = 0;
}

double AudioDeviceManager::getCurrentInputLevel() const
{
    jassert (inputLevelMeasurementEnabledCount > 0); // you need to call enableInputLevelMeasurement() before using this!
    return inputLevel;
}


END_JUCE_NAMESPACE