Enter values into a FIFO array

Hello,

I have an array called

frameBuffer = zeros (height, width, numChannels, framesPerSymbol);

and a video. The parameters of the frameBuffer are height, width, number of color channels and framesPerSymbol, which will be the number of frames that my symbol lasts.My goal is to insert frames of the video in the array as if it were a FIFO queue, that is, if framesPerSymbol is 5:

F = frames E = empty

1) E E E E E

2) F E E E E

3) F F E E E

4) F F F E E

5) F F F F E

6) F F F F F

Thanks in advance.

Answer 1

[Mehmed Saad]

I think you are trying to save last five frames in a buffer, but a for loop is not required for that purpose

frameBuffer=zeros (height, width, numChannels, framesPerSymbol);
framesInBuffer = 0;

While loop

while hasFrame(videoObject)
    frame = double(readFrame(videoObject));  

I made a change here

    frameBuffer = shiftBuffer(frameBuffer,frame);  
    framesInBuffer = framesInBuffer + 1;
   

    if framesInBuffer > framesPerSymbol
        framesInBuffer = framesPerSymbol;
        bypassEncoding = false;
    else
        bypassEncoding = true;
    end
    if ~bypassEncoding
        if canWeEncode(frameBuffer,alpha,threshold)    
            encodedBuffer = steganographicEncoding(frameBuffer,width,height,codeRows,codeCols,alpha,sigma);
            writeBufferToFinalVideo(encodedBuffer,100);
        else                                        
            writeFrameToFinalVideo(squeeze(frameBuffer(:,:,:,1)));
        end
    end
end

and a change here

function frameBuffer = shiftBuffer (frameBuffer,frame)
frameBuffer = circshift(frameBuffer,1,4); 
frameBuffer(:,:,:,1) = frame;
end

[Alber]

Yes, my idea is that when the buffer is full, to see if I can encode and after this is done it will take me another 5 frames, so until I complete all the frames of the video and can you explain this part?

function frameBuffer = shiftBuffer (frameBuffer,frame)
frameBuffer = circshift(frameBuffer,1,4); 
frameBuffer(:,:,:,1) = frame;
end

I want to take 5 frames, I encode (the whole loop below) and I will take another 5, like this until I complete all the frames of the video.