add isKeyframe method

inc/H264_V4l2DeviceSource.h

@@ -29,4 +29,5 @@ class H264_V4L2DeviceSource : public H26X_V4L2DeviceSource
 		// overide V4L2DeviceSource
 		virtual std::list< std::pair<unsigned char*,size_t> > splitFrames(unsigned char* frame, unsigned frameSize);
 		virtual std::list< std::string > getInitFrames();
+		virtual bool isKeyFrame(const char*, int);
 };

inc/H265_V4l2DeviceSource.h

@@ -29,6 +29,7 @@ class H265_V4L2DeviceSource : public H26X_V4L2DeviceSource
 		// overide V4L2DeviceSource
 		virtual std::list< std::pair<unsigned char*,size_t> > splitFrames(unsigned char* frame, unsigned frameSize);			
 		virtual std::list< std::string > getInitFrames();
+		virtual bool isKeyFrame(const char*, int);
 				
 	protected:
 		std::string m_vps;

inc/V4L2DeviceSource.h

@@ -80,6 +80,7 @@ class V4L2DeviceSource: public FramedSource
 		DeviceInterface* getDevice()               { return m_device;     }	
 		void postFrame(char * frame, int frameSize, const timeval &ref);
 		virtual std::list< std::string > getInitFrames() { return std::list< std::string >(); }
+		virtual bool isKeyFrame(const char*, int) { return false; }
 	
 
 	protected:

src/H264_V4l2DeviceSource.cpp

@@ -78,3 +78,13 @@ std::list< std::string > H264_V4L2DeviceSource::getInitFrames() {
 	frameList.push_back(this->getFrameWithMarker(m_pps));
 	return frameList;
 }
+
+bool H264_V4L2DeviceSource::isKeyFrame(const char* buffer, int size) {
+	bool res = false;
+	if (size > 4)
+	{
+		int frameType = buffer[4]&0x1F;
+		res = (frameType == 5);
+	}
+	return res;
+}

src/H265_V4l2DeviceSource.cpp

@@ -76,3 +76,13 @@ std::list< std::string > H265_V4L2DeviceSource::getInitFrames() {
 	frameList.push_back(this->getFrameWithMarker(m_pps));
 	return frameList;
 }
+
+bool H265_V4L2DeviceSource::isKeyFrame(const char* buffer, int size) {
+	bool res = false;
+	if (size > 4)
+	{
+		int frameType = (buffer[4]&0x7E)>>1;
+		res = (frameType == 19 || frameType == 20);
+	}
+	return res;	
+}