amfenc: Add DXVA2 hardware frame input support
[ffmpeg.git] / libavcodec / mpegvideo.c
index 2f5793b..45ea0f0 100644 (file)
@@ -386,6 +386,9 @@ static int init_duplicate_context(MpegEncContext *s)
     for (i = 0; i < 12; i++) {
         s->pblocks[i] = &s->block[i];
     }
+
+    FF_ALLOCZ_OR_GOTO(s->avctx, s->block32, sizeof(*s->block32), fail)
+
     if (s->avctx->codec_tag == AV_RL32("VCR2")) {
         // exchange uv
         FFSWAP(void *, s->pblocks[4], s->pblocks[5]);
@@ -421,6 +424,7 @@ static void free_duplicate_context(MpegEncContext *s)
     av_freep(&s->me.map);
     av_freep(&s->me.score_map);
     av_freep(&s->blocks);
+    av_freep(&s->block32);
     av_freep(&s->ac_val_base);
     s->block = NULL;
 }
@@ -438,6 +442,7 @@ static void backup_duplicate_context(MpegEncContext *bak, MpegEncContext *src)
     COPY(me.score_map);
     COPY(blocks);
     COPY(block);
+    COPY(block32);
     COPY(start_mb_y);
     COPY(end_mb_y);
     COPY(me.map_generation);
@@ -811,6 +816,7 @@ static void clear_context(MpegEncContext *s)
     s->dct_error_sum = NULL;
     s->block = NULL;
     s->blocks = NULL;
+    s->block32 = NULL;
     memset(s->pblocks, 0, sizeof(s->pblocks));
     s->ac_val_base = NULL;
     s->ac_val[0] =
@@ -876,7 +882,7 @@ static void clear_context(MpegEncContext *s)
  */
 av_cold int ff_mpv_common_init(MpegEncContext *s)
 {
-    int i;
+    int i, ret;
     int nb_slices = (HAVE_THREADS &&
                      s->avctx->active_thread_type & FF_THREAD_SLICE) ?
                     s->avctx->thread_count : 1;
@@ -915,10 +921,11 @@ av_cold int ff_mpv_common_init(MpegEncContext *s)
     dct_init(s);
 
     /* set chroma shifts */
-    avcodec_get_chroma_sub_sample(s->avctx->pix_fmt,
-                                  &s->chroma_x_shift,
-                                  &s->chroma_y_shift);
-
+    ret = av_pix_fmt_get_chroma_sub_sample(s->avctx->pix_fmt,
+                                           &s->chroma_x_shift,
+                                           &s->chroma_y_shift);
+    if (ret)
+        return ret;
 
     FF_ALLOCZ_OR_GOTO(s->avctx, s->picture,
                       MAX_PICTURE_COUNT * sizeof(Picture), fail);
@@ -1418,318 +1425,6 @@ void ff_mpv_frame_end(MpegEncContext *s)
         ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);
 }
 
-static int add_mb(AVMotionVector *mb, uint32_t mb_type,
-                  int dst_x, int dst_y,
-                  int motion_x, int motion_y, int motion_scale,
-                  int direction)
-{
-    mb->w = IS_8X8(mb_type) || IS_8X16(mb_type) ? 8 : 16;
-    mb->h = IS_8X8(mb_type) || IS_16X8(mb_type) ? 8 : 16;
-    mb->motion_x = motion_x;
-    mb->motion_y = motion_y;
-    mb->motion_scale = motion_scale;
-    mb->dst_x = dst_x;
-    mb->dst_y = dst_y;
-    mb->src_x = dst_x + motion_x / motion_scale;
-    mb->src_y = dst_y + motion_y / motion_scale;
-    mb->source = direction ? 1 : -1;
-    mb->flags = 0; // XXX: does mb_type contain extra information that could be exported here?
-    return 1;
-}
-
-/**
- * Print debugging info for the given picture.
- */
-void ff_print_debug_info2(AVCodecContext *avctx, AVFrame *pict, uint8_t *mbskip_table,
-                         uint32_t *mbtype_table, int8_t *qscale_table, int16_t (*motion_val[2])[2],
-                         int *low_delay,
-                         int mb_width, int mb_height, int mb_stride, int quarter_sample)
-{
-    if ((avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS) && mbtype_table && motion_val[0]) {
-        const int shift = 1 + quarter_sample;
-        const int scale = 1 << shift;
-        const int mv_sample_log2 = avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_SVQ3 ? 2 : 1;
-        const int mv_stride      = (mb_width << mv_sample_log2) +
-                                   (avctx->codec->id == AV_CODEC_ID_H264 ? 0 : 1);
-        int mb_x, mb_y, mbcount = 0;
-
-        /* size is width * height * 2 * 4 where 2 is for directions and 4 is
-         * for the maximum number of MB (4 MB in case of IS_8x8) */
-        AVMotionVector *mvs = av_malloc_array(mb_width * mb_height, 2 * 4 * sizeof(AVMotionVector));
-        if (!mvs)
-            return;
-
-        for (mb_y = 0; mb_y < mb_height; mb_y++) {
-            for (mb_x = 0; mb_x < mb_width; mb_x++) {
-                int i, direction, mb_type = mbtype_table[mb_x + mb_y * mb_stride];
-                for (direction = 0; direction < 2; direction++) {
-                    if (!USES_LIST(mb_type, direction))
-                        continue;
-                    if (IS_8X8(mb_type)) {
-                        for (i = 0; i < 4; i++) {
-                            int sx = mb_x * 16 + 4 + 8 * (i & 1);
-                            int sy = mb_y * 16 + 4 + 8 * (i >> 1);
-                            int xy = (mb_x * 2 + (i & 1) +
-                                      (mb_y * 2 + (i >> 1)) * mv_stride) << (mv_sample_log2 - 1);
-                            int mx = motion_val[direction][xy][0];
-                            int my = motion_val[direction][xy][1];
-                            mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
-                        }
-                    } else if (IS_16X8(mb_type)) {
-                        for (i = 0; i < 2; i++) {
-                            int sx = mb_x * 16 + 8;
-                            int sy = mb_y * 16 + 4 + 8 * i;
-                            int xy = (mb_x * 2 + (mb_y * 2 + i) * mv_stride) << (mv_sample_log2 - 1);
-                            int mx = motion_val[direction][xy][0];
-                            int my = motion_val[direction][xy][1];
-
-                            if (IS_INTERLACED(mb_type))
-                                my *= 2;
-
-                            mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
-                        }
-                    } else if (IS_8X16(mb_type)) {
-                        for (i = 0; i < 2; i++) {
-                            int sx = mb_x * 16 + 4 + 8 * i;
-                            int sy = mb_y * 16 + 8;
-                            int xy = (mb_x * 2 + i + mb_y * 2 * mv_stride) << (mv_sample_log2 - 1);
-                            int mx = motion_val[direction][xy][0];
-                            int my = motion_val[direction][xy][1];
-
-                            if (IS_INTERLACED(mb_type))
-                                my *= 2;
-
-                            mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
-                        }
-                    } else {
-                          int sx = mb_x * 16 + 8;
-                          int sy = mb_y * 16 + 8;
-                          int xy = (mb_x + mb_y * mv_stride) << mv_sample_log2;
-                          int mx = motion_val[direction][xy][0];
-                          int my = motion_val[direction][xy][1];
-                          mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
-                    }
-                }
-            }
-        }
-
-        if (mbcount) {
-            AVFrameSideData *sd;
-
-            av_log(avctx, AV_LOG_DEBUG, "Adding %d MVs info to frame %d\n", mbcount, avctx->frame_number);
-            sd = av_frame_new_side_data(pict, AV_FRAME_DATA_MOTION_VECTORS, mbcount * sizeof(AVMotionVector));
-            if (!sd) {
-                av_freep(&mvs);
-                return;
-            }
-            memcpy(sd->data, mvs, mbcount * sizeof(AVMotionVector));
-        }
-
-        av_freep(&mvs);
-    }
-
-    /* TODO: export all the following to make them accessible for users (and filters) */
-    if (avctx->hwaccel || !mbtype_table)
-        return;
-
-
-    if (avctx->debug & (FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE)) {
-        int x,y;
-
-        av_log(avctx, AV_LOG_DEBUG, "New frame, type: %c\n",
-               av_get_picture_type_char(pict->pict_type));
-        for (y = 0; y < mb_height; y++) {
-            for (x = 0; x < mb_width; x++) {
-                if (avctx->debug & FF_DEBUG_SKIP) {
-                    int count = mbskip_table ? mbskip_table[x + y * mb_stride] : 0;
-                    if (count > 9)
-                        count = 9;
-                    av_log(avctx, AV_LOG_DEBUG, "%1d", count);
-                }
-                if (avctx->debug & FF_DEBUG_QP) {
-                    av_log(avctx, AV_LOG_DEBUG, "%2d",
-                           qscale_table[x + y * mb_stride]);
-                }
-                if (avctx->debug & FF_DEBUG_MB_TYPE) {
-                    int mb_type = mbtype_table[x + y * mb_stride];
-                    // Type & MV direction
-                    if (IS_PCM(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "P");
-                    else if (IS_INTRA(mb_type) && IS_ACPRED(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "A");
-                    else if (IS_INTRA4x4(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "i");
-                    else if (IS_INTRA16x16(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "I");
-                    else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "d");
-                    else if (IS_DIRECT(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "D");
-                    else if (IS_GMC(mb_type) && IS_SKIP(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "g");
-                    else if (IS_GMC(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "G");
-                    else if (IS_SKIP(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "S");
-                    else if (!USES_LIST(mb_type, 1))
-                        av_log(avctx, AV_LOG_DEBUG, ">");
-                    else if (!USES_LIST(mb_type, 0))
-                        av_log(avctx, AV_LOG_DEBUG, "<");
-                    else {
-                        av_assert2(USES_LIST(mb_type, 0) && USES_LIST(mb_type, 1));
-                        av_log(avctx, AV_LOG_DEBUG, "X");
-                    }
-
-                    // segmentation
-                    if (IS_8X8(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "+");
-                    else if (IS_16X8(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "-");
-                    else if (IS_8X16(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "|");
-                    else if (IS_INTRA(mb_type) || IS_16X16(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, " ");
-                    else
-                        av_log(avctx, AV_LOG_DEBUG, "?");
-
-
-                    if (IS_INTERLACED(mb_type))
-                        av_log(avctx, AV_LOG_DEBUG, "=");
-                    else
-                        av_log(avctx, AV_LOG_DEBUG, " ");
-                }
-            }
-            av_log(avctx, AV_LOG_DEBUG, "\n");
-        }
-    }
-
-#if FF_API_DEBUG_MV
-    if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) ||
-        (avctx->debug_mv)) {
-        int mb_y;
-        int i;
-        int h_chroma_shift, v_chroma_shift, block_height;
-        const int mv_sample_log2 = avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_SVQ3 ? 2 : 1;
-        const int mv_stride      = (mb_width << mv_sample_log2) +
-                                   (avctx->codec->id == AV_CODEC_ID_H264 ? 0 : 1);
-
-        if (low_delay)
-            *low_delay = 0; // needed to see the vectors without trashing the buffers
-
-        avcodec_get_chroma_sub_sample(avctx->pix_fmt, &h_chroma_shift, &v_chroma_shift);
-
-        av_frame_make_writable(pict);
-
-        pict->opaque = NULL;
-        block_height = 16 >> v_chroma_shift;
-
-        for (mb_y = 0; mb_y < mb_height; mb_y++) {
-            int mb_x;
-            for (mb_x = 0; mb_x < mb_width; mb_x++) {
-                const int mb_index = mb_x + mb_y * mb_stride;
-                if ((avctx->debug & FF_DEBUG_VIS_QP)) {
-                    uint64_t c = (qscale_table[mb_index] * 128 / 31) *
-                                 0x0101010101010101ULL;
-                    int y;
-                    for (y = 0; y < block_height; y++) {
-                        *(uint64_t *)(pict->data[1] + 8 * mb_x +
-                                      (block_height * mb_y + y) *
-                                      pict->linesize[1]) = c;
-                        *(uint64_t *)(pict->data[2] + 8 * mb_x +
-                                      (block_height * mb_y + y) *
-                                      pict->linesize[2]) = c;
-                    }
-                }
-                if ((avctx->debug & FF_DEBUG_VIS_MB_TYPE) &&
-                    motion_val[0]) {
-                    int mb_type = mbtype_table[mb_index];
-                    uint64_t u,v;
-                    int y;
-#define COLOR(theta, r) \
-    u = (int)(128 + r * cos(theta * M_PI / 180)); \
-    v = (int)(128 + r * sin(theta * M_PI / 180));
-
-
-                    u = v = 128;
-                    if (IS_PCM(mb_type)) {
-                        COLOR(120, 48)
-                    } else if ((IS_INTRA(mb_type) && IS_ACPRED(mb_type)) ||
-                               IS_INTRA16x16(mb_type)) {
-                        COLOR(30, 48)
-                    } else if (IS_INTRA4x4(mb_type)) {
-                        COLOR(90, 48)
-                    } else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type)) {
-                        // COLOR(120, 48)
-                    } else if (IS_DIRECT(mb_type)) {
-                        COLOR(150, 48)
-                    } else if (IS_GMC(mb_type) && IS_SKIP(mb_type)) {
-                        COLOR(170, 48)
-                    } else if (IS_GMC(mb_type)) {
-                        COLOR(190, 48)
-                    } else if (IS_SKIP(mb_type)) {
-                        // COLOR(180, 48)
-                    } else if (!USES_LIST(mb_type, 1)) {
-                        COLOR(240, 48)
-                    } else if (!USES_LIST(mb_type, 0)) {
-                        COLOR(0, 48)
-                    } else {
-                        av_assert2(USES_LIST(mb_type, 0) && USES_LIST(mb_type, 1));
-                        COLOR(300,48)
-                    }
-
-                    u *= 0x0101010101010101ULL;
-                    v *= 0x0101010101010101ULL;
-                    for (y = 0; y < block_height; y++) {
-                        *(uint64_t *)(pict->data[1] + 8 * mb_x +
-                                      (block_height * mb_y + y) * pict->linesize[1]) = u;
-                        *(uint64_t *)(pict->data[2] + 8 * mb_x +
-                                      (block_height * mb_y + y) * pict->linesize[2]) = v;
-                    }
-
-                    // segmentation
-                    if (IS_8X8(mb_type) || IS_16X8(mb_type)) {
-                        *(uint64_t *)(pict->data[0] + 16 * mb_x + 0 +
-                                      (16 * mb_y + 8) * pict->linesize[0]) ^= 0x8080808080808080ULL;
-                        *(uint64_t *)(pict->data[0] + 16 * mb_x + 8 +
-                                      (16 * mb_y + 8) * pict->linesize[0]) ^= 0x8080808080808080ULL;
-                    }
-                    if (IS_8X8(mb_type) || IS_8X16(mb_type)) {
-                        for (y = 0; y < 16; y++)
-                            pict->data[0][16 * mb_x + 8 + (16 * mb_y + y) *
-                                          pict->linesize[0]] ^= 0x80;
-                    }
-                    if (IS_8X8(mb_type) && mv_sample_log2 >= 2) {
-                        int dm = 1 << (mv_sample_log2 - 2);
-                        for (i = 0; i < 4; i++) {
-                            int sx = mb_x * 16 + 8 * (i & 1);
-                            int sy = mb_y * 16 + 8 * (i >> 1);
-                            int xy = (mb_x * 2 + (i & 1) +
-                                     (mb_y * 2 + (i >> 1)) * mv_stride) << (mv_sample_log2 - 1);
-                            // FIXME bidir
-                            int32_t *mv = (int32_t *) &motion_val[0][xy];
-                            if (mv[0] != mv[dm] ||
-                                mv[dm * mv_stride] != mv[dm * (mv_stride + 1)])
-                                for (y = 0; y < 8; y++)
-                                    pict->data[0][sx + 4 + (sy + y) * pict->linesize[0]] ^= 0x80;
-                            if (mv[0] != mv[dm * mv_stride] || mv[dm] != mv[dm * (mv_stride + 1)])
-                                *(uint64_t *)(pict->data[0] + sx + (sy + 4) *
-                                              pict->linesize[0]) ^= 0x8080808080808080ULL;
-                        }
-                    }
-
-                    if (IS_INTERLACED(mb_type) &&
-                        avctx->codec->id == AV_CODEC_ID_H264) {
-                        // hmm
-                    }
-                }
-                if (mbskip_table)
-                    mbskip_table[mb_index] = 0;
-            }
-        }
-    }
-#endif
-}
-
 void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
 {
     ff_print_debug_info2(s->avctx, pict, s->mbskip_table, p->mb_type,
@@ -2431,8 +2126,31 @@ void mpv_reconstruct_mb_internal(MpegEncContext *s, int16_t block[12][64],
                 ff_wmv2_add_mb(s, block, dest_y, dest_cb, dest_cr);
             }
         } else {
+            /* Only MPEG-4 Simple Studio Profile is supported in > 8-bit mode.
+               TODO: Integrate 10-bit properly into mpegvideo.c so that ER works properly */
+            if (s->avctx->bits_per_raw_sample > 8){
+                const int act_block_size = block_size * 2;
+                s->idsp.idct_put(dest_y,                           dct_linesize, (int16_t*)(*s->block32)[0]);
+                s->idsp.idct_put(dest_y              + act_block_size, dct_linesize, (int16_t*)(*s->block32)[1]);
+                s->idsp.idct_put(dest_y + dct_offset,              dct_linesize, (int16_t*)(*s->block32)[2]);
+                s->idsp.idct_put(dest_y + dct_offset + act_block_size, dct_linesize, (int16_t*)(*s->block32)[3]);
+
+                dct_linesize = uvlinesize << s->interlaced_dct;
+                dct_offset   = s->interlaced_dct ? uvlinesize : uvlinesize*block_size;
+
+                s->idsp.idct_put(dest_cb,              dct_linesize, (int16_t*)(*s->block32)[4]);
+                s->idsp.idct_put(dest_cr,              dct_linesize, (int16_t*)(*s->block32)[5]);
+                s->idsp.idct_put(dest_cb + dct_offset, dct_linesize, (int16_t*)(*s->block32)[6]);
+                s->idsp.idct_put(dest_cr + dct_offset, dct_linesize, (int16_t*)(*s->block32)[7]);
+                if(!s->chroma_x_shift){//Chroma444
+                    s->idsp.idct_put(dest_cb + act_block_size,              dct_linesize, (int16_t*)(*s->block32)[8]);
+                    s->idsp.idct_put(dest_cr + act_block_size,              dct_linesize, (int16_t*)(*s->block32)[9]);
+                    s->idsp.idct_put(dest_cb + act_block_size + dct_offset, dct_linesize, (int16_t*)(*s->block32)[10]);
+                    s->idsp.idct_put(dest_cr + act_block_size + dct_offset, dct_linesize, (int16_t*)(*s->block32)[11]);
+                }
+            }
             /* dct only in intra block */
-            if(s->encoding || !(s->codec_id==AV_CODEC_ID_MPEG1VIDEO || s->codec_id==AV_CODEC_ID_MPEG2VIDEO)){
+            else if(s->encoding || !(s->codec_id==AV_CODEC_ID_MPEG1VIDEO || s->codec_id==AV_CODEC_ID_MPEG2VIDEO)){
                 put_dct(s, block[0], 0, dest_y                          , dct_linesize, s->qscale);
                 put_dct(s, block[1], 1, dest_y              + block_size, dct_linesize, s->qscale);
                 put_dct(s, block[2], 2, dest_y + dct_offset             , dct_linesize, s->qscale);
@@ -2513,7 +2231,8 @@ void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h)
 void ff_init_block_index(MpegEncContext *s){ //FIXME maybe rename
     const int linesize   = s->current_picture.f->linesize[0]; //not s->linesize as this would be wrong for field pics
     const int uvlinesize = s->current_picture.f->linesize[1];
-    const int mb_size= 4 - s->avctx->lowres;
+    const int width_of_mb = (4 + (s->avctx->bits_per_raw_sample > 8)) - s->avctx->lowres;
+    const int height_of_mb = 4 - s->avctx->lowres;
 
     s->block_index[0]= s->b8_stride*(s->mb_y*2    ) - 2 + s->mb_x*2;
     s->block_index[1]= s->b8_stride*(s->mb_y*2    ) - 1 + s->mb_x*2;
@@ -2523,20 +2242,20 @@ void ff_init_block_index(MpegEncContext *s){ //FIXME maybe rename
     s->block_index[5]= s->mb_stride*(s->mb_y + s->mb_height + 2) + s->b8_stride*s->mb_height*2 + s->mb_x - 1;
     //block_index is not used by mpeg2, so it is not affected by chroma_format
 
-    s->dest[0] = s->current_picture.f->data[0] + (int)((s->mb_x - 1U) <<  mb_size);
-    s->dest[1] = s->current_picture.f->data[1] + (int)((s->mb_x - 1U) << (mb_size - s->chroma_x_shift));
-    s->dest[2] = s->current_picture.f->data[2] + (int)((s->mb_x - 1U) << (mb_size - s->chroma_x_shift));
+    s->dest[0] = s->current_picture.f->data[0] + (int)((s->mb_x - 1U) <<  width_of_mb);
+    s->dest[1] = s->current_picture.f->data[1] + (int)((s->mb_x - 1U) << (width_of_mb - s->chroma_x_shift));
+    s->dest[2] = s->current_picture.f->data[2] + (int)((s->mb_x - 1U) << (width_of_mb - s->chroma_x_shift));
 
     if(!(s->pict_type==AV_PICTURE_TYPE_B && s->avctx->draw_horiz_band && s->picture_structure==PICT_FRAME))
     {
         if(s->picture_structure==PICT_FRAME){
-        s->dest[0] += s->mb_y *   linesize << mb_size;
-        s->dest[1] += s->mb_y * uvlinesize << (mb_size - s->chroma_y_shift);
-        s->dest[2] += s->mb_y * uvlinesize << (mb_size - s->chroma_y_shift);
+        s->dest[0] += s->mb_y *   linesize << height_of_mb;
+        s->dest[1] += s->mb_y * uvlinesize << (height_of_mb - s->chroma_y_shift);
+        s->dest[2] += s->mb_y * uvlinesize << (height_of_mb - s->chroma_y_shift);
         }else{
-            s->dest[0] += (s->mb_y>>1) *   linesize << mb_size;
-            s->dest[1] += (s->mb_y>>1) * uvlinesize << (mb_size - s->chroma_y_shift);
-            s->dest[2] += (s->mb_y>>1) * uvlinesize << (mb_size - s->chroma_y_shift);
+            s->dest[0] += (s->mb_y>>1) *   linesize << height_of_mb;
+            s->dest[1] += (s->mb_y>>1) * uvlinesize << (height_of_mb - s->chroma_y_shift);
+            s->dest[2] += (s->mb_y>>1) * uvlinesize << (height_of_mb - s->chroma_y_shift);
             av_assert1((s->mb_y&1) == (s->picture_structure == PICT_BOTTOM_FIELD));
         }
     }