Function main

tools/scale_slice_test.c:112–190

}

int main(int argc, char **argv)
{
    PrivData      pd;
    DecodeContext dc;

    int width, height;
    enum AVPixelFormat pix_fmt;
    const char *filename;
    int ret = 0;

    if (argc <= 4) {
        fprintf(stderr,
                "Usage: %s <input file> <dst width> <dst height> <dst pixfmt> [<random seed>] \n",
                argv[0]);
        return 0;
    }

    memset(&pd, 0, sizeof(pd));

    filename     = argv[1];
    width        = strtol(argv[2], NULL, 0);
    height       = strtol(argv[3], NULL, 0);
    pix_fmt      = av_get_pix_fmt(argv[4]);

    /* init RNG for generating slice sizes */
    if (argc >= 6)
        pd.random_seed = strtoul(argv[5], NULL, 0);
    else
        pd.random_seed = av_get_random_seed();

    av_lfg_init(&pd.lfg, pd.random_seed);

    av_pix_fmt_get_chroma_sub_sample(pix_fmt, &pd.h_shift_dst, &pd.v_shift_dst);

    /* allocate the frames for scaler output */
    for (int i = 0; i < 2; i++) {
        AVFrame *frame = av_frame_alloc();
        if (!frame) {
            fprintf(stderr, "Error allocating frames\n");
            return AVERROR(ENOMEM);
        }

        frame->width  = width;
        frame->height = height;
        frame->format = pix_fmt;

        ret = av_frame_get_buffer(frame, 0);
        if (ret < 0) {
            fprintf(stderr, "Error allocating frame data\n");
            return ret;
        }

        /* make sure the padding is zeroed */
        for (int j = 0; j < 4 && frame->data[j]; j++) {
            int shift = (j == 1 || j == 2) ? pd.v_shift_dst : 0;
            memset(frame->data[j], 0,
                   frame->linesize[j] * (height >> shift));
        }