Function init_scan_tables

libavcodec/h264_slice.c:754–786

* initialize scan tables */

 * initialize scan tables
 */
static void init_scan_tables(H264Context *h)
{
    int i;
    for (i = 0; i < 16; i++) {
#define TRANSPOSE(x) ((x) >> 2) | (((x) << 2) & 0xF)
        h->zigzag_scan[i] = TRANSPOSE(ff_zigzag_scan[i]);
        h->field_scan[i]  = TRANSPOSE(field_scan[i]);
#undef TRANSPOSE
    }
    for (i = 0; i < 64; i++) {
#define TRANSPOSE(x) ((x) >> 3) | (((x) & 7) << 3)
        h->zigzag_scan8x8[i]       = TRANSPOSE(ff_zigzag_direct[i]);
        h->zigzag_scan8x8_cavlc[i] = TRANSPOSE(zigzag_scan8x8_cavlc[i]);
        h->field_scan8x8[i]        = TRANSPOSE(field_scan8x8[i]);
        h->field_scan8x8_cavlc[i]  = TRANSPOSE(field_scan8x8_cavlc[i]);
#undef TRANSPOSE
    }
    if (h->ps.sps->transform_bypass) { // FIXME same ugly
        memcpy(h->zigzag_scan_q0          , ff_zigzag_scan          , sizeof(h->zigzag_scan_q0         ));
        memcpy(h->zigzag_scan8x8_q0       , ff_zigzag_direct        , sizeof(h->zigzag_scan8x8_q0      ));
        memcpy(h->zigzag_scan8x8_cavlc_q0 , zigzag_scan8x8_cavlc    , sizeof(h->zigzag_scan8x8_cavlc_q0));
        memcpy(h->field_scan_q0           , field_scan              , sizeof(h->field_scan_q0          ));
        memcpy(h->field_scan8x8_q0        , field_scan8x8           , sizeof(h->field_scan8x8_q0       ));
        memcpy(h->field_scan8x8_cavlc_q0  , field_scan8x8_cavlc     , sizeof(h->field_scan8x8_cavlc_q0 ));
    } else {
        memcpy(h->zigzag_scan_q0          , h->zigzag_scan          , sizeof(h->zigzag_scan_q0         ));
        memcpy(h->zigzag_scan8x8_q0       , h->zigzag_scan8x8       , sizeof(h->zigzag_scan8x8_q0      ));
        memcpy(h->zigzag_scan8x8_cavlc_q0 , h->zigzag_scan8x8_cavlc , sizeof(h->zigzag_scan8x8_cavlc_q0));
        memcpy(h->field_scan_q0           , h->field_scan           , sizeof(h->field_scan_q0          ));
        memcpy(h->field_scan8x8_q0        , h->field_scan8x8        , sizeof(h->field_scan8x8_q0       ));
        memcpy(h->field_scan8x8_cavlc_q0  , h->field_scan8x8_cavlc  , sizeof(h->field_scan8x8_cavlc_q0 ));
    }
}

static enum AVPixelFormat get_pixel_format(H264Context *h, int force_callback)
{