implement peakValueListChanged

libraries/audio-client/src/AudioClient.cpp

@@ -77,7 +77,7 @@ Setting::Handle<int> staticJitterBufferFrames("staticJitterBufferFrames",
 // protect the Qt internal device list
 using Mutex = std::mutex;
 using Lock = std::unique_lock<Mutex>;
-static Mutex _deviceMutex;
+Mutex _deviceMutex;
 
 // thread-safe
 QList<QAudioDeviceInfo> getAvailableDevices(QAudio::Mode mode) {
@@ -235,7 +235,7 @@ AudioClient::AudioClient() :
         QtConcurrent::run(QThreadPool::globalInstance(), [this] { checkPeakValues(); });
     });
     const unsigned long PEAK_VALUES_CHECK_INTERVAL_SECS = 50;
-
+    _checkPeakValuesTimer->start(PEAK_VALUES_CHECK_INTERVAL_SECS);
 
     configureReverb();
 
@@ -308,8 +308,6 @@ QString getWinDeviceName(IMMDevice* pEndpoint) {
     QString deviceName;
     IPropertyStore* pPropertyStore;
     pEndpoint->OpenPropertyStore(STGM_READ, &pPropertyStore);
-    pEndpoint->Release();
-    pEndpoint = nullptr;
     PROPVARIANT pv;
     PropVariantInit(&pv);
     HRESULT hr = pPropertyStore->GetValue(PKEY_Device_FriendlyName, &pv);
@@ -338,6 +336,8 @@ QString AudioClient::getWinDeviceName(wchar_t* guid) {
         deviceName = QString("NONE");
     } else {
         deviceName = ::getWinDeviceName(pEndpoint);
+        pEndpoint->Release();
+        pEndpoint = nullptr;
     }
     pMMDeviceEnumerator->Release();
     pMMDeviceEnumerator = nullptr;
@@ -421,6 +421,8 @@ QAudioDeviceInfo defaultAudioDeviceForMode(QAudio::Mode mode) {
             deviceName = QString("NONE");
         } else {
             deviceName = getWinDeviceName(pEndpoint);
+            pEndpoint->Release();
+            pEndpoint = nullptr;
         }
         pMMDeviceEnumerator->Release();
         pMMDeviceEnumerator = NULL;

libraries/audio-client/src/AudioClient.h

@@ -149,6 +149,7 @@ public:
     QList<QAudioDeviceInfo> getAudioDevices(QAudio::Mode mode) const;
 
     void enablePeakValues(bool enable) { _enablePeakValues = enable; }
+    bool peakValuesAvailable() const;
 
     static const float CALLBACK_ACCELERATOR_RATIO;
 

libraries/audio-client/src/AudioPeakValues.cpp

@@ -11,6 +11,166 @@
 
 #include "AudioClient.h"
 
-void AudioClient::checkPeakValues() {
-    // TODO
+#ifdef Q_OS_WIN
+
+#include <windows.h>
+#include <mmdeviceapi.h>
+#include <endpointvolume.h>
+#include <audioclient.h>
+
+#include <QString>
+
+#define RETURN_ON_FAIL(result) if (FAILED(result)) { return; }
+#define CONTINUE_ON_FAIL(result) if (FAILED(result)) { continue; }
+
+extern QString getWinDeviceName(IMMDevice* pEndpoint);
+extern std::mutex _deviceMutex;
+
+std::map<std::wstring, std::shared_ptr<IAudioClient>> activeClients;
+
+template <class T>
+void release(T* t) {
+    t->Release();
 }
+
+template <>
+void release(IAudioClient* audioClient) {
+    audioClient->Stop();
+    audioClient->Release();
+}
+
+void AudioClient::checkPeakValues() {
+    // prepare the windows environment
+    CoInitialize(NULL);
+
+    // if disabled, clean up active clients
+    if (!_enablePeakValues) {
+        activeClients.clear();
+        return;
+    }
+
+    // lock the devices so the _inputDevices list is static
+    std::unique_lock<std::mutex> lock(_deviceMutex);
+    HRESULT result;
+
+    // initialize the payload
+    QList<float> peakValueList;
+    for (int i = 0; i < _inputDevices.size(); ++i) {
+        peakValueList.push_back(0.0f);
+    }
+
+    std::shared_ptr<IMMDeviceEnumerator> enumerator;
+    {
+        IMMDeviceEnumerator* pEnumerator;
+        result = CoCreateInstance(
+            __uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER,
+            __uuidof(IMMDeviceEnumerator), (void**)&pEnumerator);
+        RETURN_ON_FAIL(result);
+        enumerator = std::shared_ptr<IMMDeviceEnumerator>(pEnumerator, &release<IMMDeviceEnumerator>);
+    }
+
+    std::shared_ptr<IMMDeviceCollection> endpoints;
+    {
+        IMMDeviceCollection* pEndpoints;
+        result = enumerator->EnumAudioEndpoints(eCapture, DEVICE_STATE_ACTIVE, &pEndpoints);
+        RETURN_ON_FAIL(result);
+        endpoints = std::shared_ptr<IMMDeviceCollection>(pEndpoints, &release<IMMDeviceCollection>);
+    }
+
+    UINT count;
+    {
+        result = endpoints->GetCount(&count);
+        RETURN_ON_FAIL(result);
+    }
+
+    IMMDevice* pDevice;
+    std::shared_ptr<IMMDevice> device;
+    IAudioMeterInformation* pMeterInfo;
+    std::shared_ptr<IAudioMeterInformation> meterInfo;
+    IAudioClient* pAudioClient;
+    std::shared_ptr<IAudioClient> audioClient;
+    DWORD hardwareSupport;
+    LPWSTR pDeviceId = NULL;
+    LPWAVEFORMATEX format;
+    float peakValue;
+    QString deviceName;
+    int deviceIndex;
+    for (UINT i = 0; i < count; ++i) {
+        result = endpoints->Item(i, &pDevice);
+        CONTINUE_ON_FAIL(result);
+        device = std::shared_ptr<IMMDevice>(pDevice, &release<IMMDevice>);
+
+        // if the device isn't listed through Qt, skip it
+        deviceName = ::getWinDeviceName(pDevice);
+        deviceIndex = 0;
+        for (;  deviceIndex < _inputDevices.size(); ++deviceIndex) {
+            if (deviceName == _inputDevices[deviceIndex].deviceName()) {
+                break;
+            }
+        }
+        if (deviceIndex >= _inputDevices.size()) {
+            continue;
+        }
+
+        //continue;
+
+        result = device->Activate(__uuidof(IAudioMeterInformation), CLSCTX_ALL, NULL, (void**)&pMeterInfo);
+        CONTINUE_ON_FAIL(result);
+        meterInfo = std::shared_ptr<IAudioMeterInformation>(pMeterInfo, &release<IAudioMeterInformation>);
+
+        //continue;
+
+        hardwareSupport;
+        result = meterInfo->QueryHardwareSupport(&hardwareSupport);
+        CONTINUE_ON_FAIL(result);
+
+        //continue;
+
+        // if the device has no hardware support (USB)...
+        if (!(hardwareSupport & ENDPOINT_HARDWARE_SUPPORT_METER)) {
+            result = device->GetId(&pDeviceId);
+            CONTINUE_ON_FAIL(result);
+            std::wstring deviceId(pDeviceId);
+            CoTaskMemFree(pDeviceId);
+
+            //continue;
+
+            // ...and no active client...
+            if (activeClients.find(deviceId) == activeClients.end()) {
+                result = device->Activate(__uuidof(IAudioClient), CLSCTX_ALL, NULL, (void**)&pAudioClient);
+                CONTINUE_ON_FAIL(result);
+                audioClient = std::shared_ptr<IAudioClient>(pAudioClient, &release<IAudioClient>);
+
+                //continue;
+
+                // ...activate a client
+                audioClient->GetMixFormat(&format);
+                audioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, 0, 0, 0, format, NULL);
+                audioClient->Start();
+
+                //continue;
+
+                activeClients[deviceId] = audioClient;
+            }
+        }
+
+        // get the peak value and put it in the payload
+        meterInfo->GetPeakValue(&peakValue);
+        peakValueList[deviceIndex] = peakValue;
+    }
+
+    emit peakValueListChanged(peakValueList);
+}
+
+bool AudioClient::peakValuesAvailable() const {
+    return true;
+}
+
+#else
+void AudioClient::checkPeakValues() {
+}
+
+bool AudioClient::peakValuesAvailable() const {
+    return false;
+}
+#endif