fixed some bugs

api/iOS/VCSimpleSession.mm

@@ -818,9 +818,10 @@ - (void) addEncodersAndPacketizers
                                                                         self.fps,
                                                                         self.bitrate);
         }
-        m_audioMixer->setOutput(m_aacEncoder);
-        m_videoSplit->setOutput(m_h264Encoder);
-
+        if (m_aacEncoder != nullptr && m_h264Encoder != nullptr) {
+            m_audioMixer->setOutput(m_aacEncoder);
+            m_videoSplit->setOutput(m_h264Encoder);
+        }
     }
     {
         m_aacSplit = std::make_shared<videocore::Split>();
@@ -853,6 +854,7 @@ - (void) addEncodersAndPacketizers
 
 
 }
+/*
 - (void) addPixelBufferSource: (UIImage*) image
                      withRect:(CGRect)rect {
     CGImageRef ref = [image CGImage];
@@ -890,7 +892,54 @@ - (void) addPixelBufferSource: (UIImage*) image
 
     free(rawData);
 
+}*/
+
+- (void) addPixelBufferSource: (UIImage*) image
+withRect:(CGRect)rect {
+CGImageRef ref = [image CGImage];
+
+std::shared_ptr<videocore::Apple::PixelBufferSource>     temp_pixelBufferSource = m_pixelBufferSource;
+
+
+m_pixelBufferSource = std::make_shared<videocore::Apple::PixelBufferSource>(CGImageGetWidth(ref),
+CGImageGetHeight(ref),
+'BGRA');
+NSUInteger width = CGImageGetWidth(ref);
+NSUInteger height = CGImageGetHeight(ref);
+CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
+unsigned char *rawData = (unsigned char*) calloc(height * width * 4, sizeof(unsigned char));
+NSUInteger bytesPerPixel = 4;
+NSUInteger bytesPerRow = bytesPerPixel * width;
+NSUInteger bitsPerComponent = 8;
+CGContextRef context = CGBitmapContextCreate(rawData, width, height,
+bitsPerComponent, bytesPerRow, colorSpace,
+kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little);
+CGColorSpaceRelease(colorSpace);
+
+CGContextDrawImage(context, CGRectMake(0, 0, width, height), ref);
+CGContextRelease(context);
+
+m_pbAspect = std::make_shared<videocore::AspectTransform>(rect.size.width,rect.size.height,videocore::AspectTransform::kAspectFit);
+
+m_pbPosition = std::make_shared<videocore::PositionTransform>(rect.origin.x, rect.origin.y,
+rect.size.width, rect.size.height,
+self.videoSize.width, self.videoSize.height
+);
+m_pixelBufferSource->setOutput(m_pbAspect);
+m_pbAspect->setOutput(m_pbPosition);
+m_pbPosition->setOutput(m_videoMixer);
+m_videoMixer->registerSource(m_pixelBufferSource);
+m_pixelBufferSource->pushPixelBuffer(rawData, width * height * 4);
+
+free(rawData);
+
+
+if(temp_pixelBufferSource){
+m_videoMixer->unregisterSource(temp_pixelBufferSource);
+}
+
 }
+
 - (NSString *) applicationDocumentsDirectory
 {
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);