Add low quality mode for juce CameraDevice

modules/juce_video/capture/juce_CameraDevice.cpp

@@ -22,8 +22,9 @@
   ==============================================================================
 */
 
-CameraDevice::CameraDevice (const String& nm, int index, int minWidth, int minHeight, int maxWidth, int maxHeight)
-   : name (nm), pimpl (new Pimpl (name, index, minWidth, minHeight, maxWidth, maxHeight))
+CameraDevice::CameraDevice (const String& nm, int index, int minWidth, int minHeight, int maxWidth, int maxHeight,
+                            bool highQuality)
+   : name (nm), pimpl (new Pimpl (name, index, minWidth, minHeight, maxWidth, maxHeight, highQuality))
 {
 }
 
@@ -77,10 +78,12 @@ StringArray CameraDevice::getAvailableDevices()
 
 CameraDevice* CameraDevice::openDevice (int index,
                                         int minWidth, int minHeight,
-                                        int maxWidth, int maxHeight)
+                                        int maxWidth, int maxHeight,
+                                        bool highQuality)
 {
     ScopedPointer<CameraDevice> d (new CameraDevice (getAvailableDevices() [index], index,
-                                                     minWidth, minHeight, maxWidth, maxHeight));
+                                                     minWidth, minHeight, maxWidth, maxHeight,
+                                                     highQuality));
 
     if (d->pimpl->openedOk())
         return d.release();

modules/juce_video/capture/juce_CameraDevice.h

@@ -58,10 +58,15 @@ public:
         The size constraints allow the method to choose between different resolutions if
         the camera supports this. If the resolution cam't be specified (e.g. on the Mac)
         then these will be ignored.
+
+        On Mac, if highQuality is false, then the camera will be opened in preview mode
+        which will allow the OS to drop frames if the computer cannot keep up in processing
+        the frames.
     */
     static CameraDevice* openDevice (int deviceIndex,
                                      int minWidth = 128, int minHeight = 64,
-                                     int maxWidth = 1024, int maxHeight = 768);
+                                     int maxWidth = 1024, int maxHeight = 768,
+                                     bool highQuality = true);
 
     //==============================================================================
     /** Returns the name of this device */
@@ -147,7 +152,7 @@ private:
     friend struct ViewerComponent;
 
     CameraDevice (const String& name, int index,
-                  int minWidth, int minHeight, int maxWidth, int maxHeight);
+                  int minWidth, int minHeight, int maxWidth, int maxHeight, bool highQuality);
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (CameraDevice)
 };

modules/juce_video/native/juce_mac_CameraDevice.mm

@@ -30,7 +30,8 @@ extern Image juce_createImageFromCIImage (CIImage*, int w, int h);
 
 struct CameraDevice::Pimpl
 {
-    Pimpl (const String&, const int index, int /*minWidth*/, int /*minHeight*/, int /*maxWidth*/, int /*maxHeight*/)
+    Pimpl (const String&, const int index, int /*minWidth*/, int /*minHeight*/, int /*maxWidth*/, int /*maxHeight*/,
+           bool useHighQuality)
         : input (nil),
           audioDevice (nil),
           audioInput (nil),
@@ -66,8 +67,9 @@ struct CameraDevice::Pimpl
                 if (err == nil)
                 {
                     resetFile();
+                    imageOutput = useHighQuality ? [[QTCaptureDecompressedVideoOutput alloc] init] :
+                                                   [[QTCaptureVideoPreviewOutput alloc] init];
 
-                    imageOutput = [[QTCaptureDecompressedVideoOutput alloc] init];
                     [imageOutput setDelegate: callbackDelegate];
 
                     if (err == nil)
@@ -263,7 +265,7 @@ struct CameraDevice::Pimpl
     QTCaptureDeviceInput* audioInput;
     QTCaptureSession* session;
     QTCaptureMovieFileOutput* fileOutput;
-    QTCaptureDecompressedVideoOutput* imageOutput;
+    QTCaptureOutput* imageOutput;
     NSObject* callbackDelegate;
     String openingError;
     int64 firstPresentationTime, averageTimeOffset;

modules/juce_video/native/juce_win32_CameraDevice.cpp

@@ -49,7 +49,7 @@ struct CameraDevice::Pimpl  : public ChangeBroadcaster
 {
     Pimpl (const String&, int index,
            int minWidth, int minHeight,
-           int maxWidth, int maxHeight)
+           int maxWidth, int maxHeight, bool /*highQuality*/)
        : isRecording (false),
          openedSuccessfully (false),
          imageNeedsFlipping (false),

modules/juce_video/native/juce_win32_DirectShowComponent.cpp

@@ -597,10 +597,10 @@ private:
             if (wc->isRegistered())
             {
                 DWORD exstyle = 0;
-                DWORD type = WS_CHILD;
+                DWORD windowType = WS_CHILD;
 
                 hwnd = CreateWindowEx (exstyle, wc->getWindowClassName(),
-                                       L"", type, 0, 0, 0, 0, parentToAddTo, 0,
+                                       L"", windowType, 0, 0, 0, 0, parentToAddTo, 0,
                                        (HINSTANCE) Process::getCurrentModuleInstanceHandle(), 0);
 
                 if (hwnd != 0)