Methods and apparatus for bridging different video formats

A method for bridging an input video stream to an output video stream for a display;

• comprising:
• generating an output clock signal for the display, and using the clock signal producing a pixel clock determining pixel timing for the output video stream, a horizontal synchronization clock determining a line length in the output video stream, and a vertical synchronization clock determining a frame length in the output video stream;
• causing an output frame supplied to the display using said clock signal to have a period substantially the same as a frame in the input video stream;
• determining a number of pixel clock cycles in a residue line within the output frame;
• and
• if the number of pixels clock cycles in the residue line is less than a minimum line length, then distributing the pixel clock cycles of the residue line to other lines in the frame, by providing a number of lines having a first number of pixel clock cycles, and a number of lines having a second number of pixel clock cycles different than the first number.

A method for bridging an input video stream to an output video stream for a display;

• comprising:
• generating an output clock signal for the display, and using the clock signal producing a pixel clock determining pixel timing for the output video stream, a horizontal synchronization clock determining a line length in the output video stream, and a vertical synchronization clock determining a frame length in the output video stream;
• causing an output frame supplied to the display using said clock signal to have a period substantially the same as a frame in the input video stream;
• and
• determining a number of frames in a set of frames in the output video stream in which a number of pixel clock cycles in a residue lines of the frames in the set reaches a minimum number, and then inserting an extra line in one frame of said set of frames.

A method for bridging an input video stream to an output video stream for a display;

• comprising:
• generating an output clock signal for the display, and using the clock signal producing a pixel clock determining pixel timing for the output video stream, a horizontal synchronization clock determining a line length in the output video stream, and a vertical synchronization clock determining a frame length in the output video stream;
• setting an lower bound input delay and an upper bound input delay, wherein the lower and upper bound input delays are respective numbers of lines plus numbers of pixels in the input video stream;
• outputting a first active line in a frame of the output video stream after a back porch number of lines in the output video stream after an output vertical synchronization clock cycle;
• inserting a front porch number of lines in the output video stream after a last active line in said frame of the output video stream;
• and
• adjusting the number of front porch lines if the first active line in said frame in the output video stream is outputted before the lower bound input delay or after the upper bound input delay.

A method for bridging an input video stream to an output video stream for a display;

• comprising:
• generating an output clock signal for the display, and using the clock signal producing a pixel clock determining pixel timing for the output video stream, a horizontal synchronization clock determining a line length in the output video stream, and a vertical synchronization clock determining a frame length in the output video stream;
• counting input active lines and pixels to determine a position in the input frame and output active lines and pixels to determine a position in the output frame;
• during outputting of active output lines, determining a normalized distance between the position in the input frame and the position in the output frame;
• and
• adjusting the number of pixels per line according to the normalized distance.