09-29-2012 02:59 AM
I am working on a project and need to process image frames acquainted before it goes to display. From the VIP Camera example, I found this:display = alt_video_display_only_frame_init(// ALT_VIDEO_DISPLAY_SGDMA_NAME, // char* sgdma_name FRAME_BUF_W, // int width FRAME_BUF_H, // int height ALT_VIDEO_DISPLAY_COLOR_DEPTH, // int color_depth SDRAM_BASE + 0x00800000, // int buffer_location 1 ); // int num_buffers I wish to process the image obtained in 3D arrays(R,G,B ) but I have difficulty extracting the values from "display" and also how to put back the processed image into "display". Can someone help to guide me? I am quite new in NIOS II, is there any documentation or guide on this alt_video_display library? Thank You
09-29-2012 11:04 AM
09-29-2012 03:28 PM
--- Quote Start --- Check: http://www.altera.com/literature/an/an527.pdf (http://www.altera.com/literature/an/an527.pdf) All of the functions (as far as I can tell) are listed there as well as descriptions for each function. --- Quote End --- Thank You for the link. It was certainly helpful but I still quite confuse with this function: ======== int alt_video_display_buffer_is_available(alt_video_display* display); This function returns the next free frame buffer available for display. The function returns a condition code of 0 if an empty buffer is found; any other return value indicates failure. The function accepts the following parameter: ■ display: This variable is a pointer to a data structure that keeps track of all of the frame buffer information, including the start addresses for all of the frame buffers. ======== It says that it return 0 or other number indicates failure. Then, my question is, where is the frame I want goes? I need the frame to do analysis before display. Thank you.