what is the different between writePartial function and write function in V4l2Output ?

[how0723]

what is the different between writePartial function and write function in V4l2Output ?

class V4l2Output : public V4l2Access
{		
	protected:
		V4l2Output(V4l2Device* device);

	public:
		static V4l2Output* create(const V4L2DeviceParameters & param, IoType iotype = V4l2Access::IOTYPE_MMAP);
		virtual ~V4l2Output();
	
		size_t write(char* buffer, size_t bufferSize);
		int    isWritable(timeval* tv);
		bool   startPartialWrite(void);
		size_t writePartial(char* buffer, size_t bufferSize);
		bool   endPartialWrite(void);
};

[mpromonet]

Hi,

This come from a pull request, I hesitated to merge. It implements a buffer management inside library. Using startPartialWrite, multiple call to writePartial will fill up the buffer and then endPartialWrite will write the concatenated buffers.
Same thing could be achieved concatenating buffer and call write.
Best Regards
Michel

[how0723]

thanks very much