Le mar, 16/03/2004 à 12:13 +0800, yumi maiko a écrit :
> Hi all,
> Could anyone tell me that why the video_buffer
> size is height * width * 3 , 3 times the frame size?
RGB, you need 1 byte per color.
> Also, why the amount write to and read from
> video_buffer is this size too, as specified from
> "video_channel->read (video_buffer, height*width*3)"
> and "video_channel->write (video_buffer,
> height*width*3)" in videograbber.cpp?
> I made two new buffers temp_buffer1 and
> temp_buffer2 to store the data come from two cameras.
> And then,I use the function from openmcu
> VideoBuffer::Write(BYTE *data,PINDEX amount,PINDEX
> posn) and
> VideoBuffer::Read(BYTE *data,PINDEX amount) to
> integrate the two camera images into the original
> video_buffer for gnomemeeting to display.
> Below is the code I wrote:
>
> videoBuffer.CombineImage ((BYTE *) video_buffer,(BYTE
> *)temp_buffer1,
> (BYTE *) temp_buffer2,
> height * width );
>
> void VideoBuffer::CombineImage(BYTE * result_buffer,
> BYTE * input_buffer1, BYTE * input_buffer2, PINDEX
> amount){
> Write(input_buffer1, amount, 0);
> Write(input_buffer2, amount, 1);
> Read(result_buffer,amount);
> }
>
> After I compile it and then run gnomemeeting, the
> screen is divided into 4,with green image,and then
> hang up.I tried for different PINDEX amount for the
> buffer to read from and write to,some hangs up and
> some shows nothing. Could anyone help me?
> Thanks alot!
>
> Regards,
> wah
>
>
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