[Avifile]yuv 422 files to avi

[G Blair]

I have sets of individual 8 bit yuv files from High Sierra DDR's.

Each file is 720 x 486 x 2 bytes in size (699,840).

The chroma space is 422.

The FOURCC of the data is UYVY. (CbYCrY)

I wish to build an avi file.

This is my first attempt at usinmg the library functions in avifile.


I am using Friday's CVS avifile.

I hacked a copy of avimake (jpeg files -> avi stream)

I set up a bitmapinfo structure:
    width = 720; height = 486;
    memset(bi, 0, sizeof(*bi));
    bi->biSize        = sizeof(*bi);
    bi->biWidth       = width;
    bi->biHeight      = height;
    bi->biSizeImage   = bi->biWidth * bi->biHeight * 2;
    bi->biPlanes      = 1;
    bi->biCompression = FOURCC_UYVY;
    bi->biBitCount    = 16;

The 
    avm::IWriteFile* outFile = avm::CreateWriteFile(outFn);

    fps = 30;
    codec = fccUYVY;
    outFile->AddVideoStream(codec, &bi, 1000000/fps);

    avm::IVideoWriteStream* vidStr =
        outFile->AddVideoStream(codec, &bi, 1000000/fr);

    vidStr->Start();
 
sequence succeeds.

I read a file:
    unsigned int line_size = 2 * width;
    uint8_t* data = new uint8_t[line_size*height];
    uint8_t* line = new uint8_t[line_size];

    FILE * infile = fopen(fname, "rb");
    if (infile  == NULL) {
        cerr << "can't open " <<  fname 
             << ": " << strerror(errno) << endl;
        exit(1);
    }
    fread(data, 2, width * height, infile);
    fclose(infile);

Fix the line order to be from bottom to top:

    for(int y = 0; y < height; y++) {
         
        // The damn BMP files are backwards! 
        // (first row at bottom of image, and BGR instead of RGB):
        
        uint8_t* ptr1 = & data[line_size * y];
        uint8_t* ptr2 = & data[line_size * (height-y - 2)];
        memcpy(line, ptr1, line_size);
        memcpy(ptr1, ptr2, line_size);
        memcpy(ptr2, line, line_size);
    }

    delete [] line;

    avm::CImage frame(data, width, height);

The addFrame(&frame); call failed producing the message:
<CImage> : Cannot convert from 24 bit image to unimplemented UYVY  0x59565955

I suspect 
    avm::CImage frame(data, width, height);
is not the correct call to set up 422 data.

I also tried a fourcc of YUY2 (byte swapped UYVY) but it did not make any difference.

I could flip from 422 to 444, but I want to avoid converting to RGB

Any suggestions?

Any documentation on avifile library functions?

... Greg



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