]> git.sesse.net Git - ffmpeg/blobdiff - libavcodec/vc1_block.c
lavc: Add coded bitstream read/write support for AV1
[ffmpeg] / libavcodec / vc1_block.c
index de06b6fb2a4d91ca828aa9814ce09ca94afa0023..86320db959a36b08935e33c3459e19f2b8d9999c 100644 (file)
@@ -45,6 +45,9 @@ static const uint8_t offset_table[2][9] = {
     {  0,  1,  3,  7, 15, 31, 63, 127, 255 },
 };
 
+// mapping table for internal block representation
+static const int block_map[6] = {0, 2, 1, 3, 4, 5};
+
 /***********************************************************************/
 /**
  * @name VC-1 Bitplane decoding
@@ -66,7 +69,7 @@ static inline void init_block_index(VC1Context *v)
 
 /** @} */ //Bitplane group
 
-static void vc1_put_signed_blocks_clamped(VC1Context *v)
+static void vc1_put_blocks_clamped(VC1Context *v, int put_signed)
 {
     MpegEncContext *s = &v->s;
     uint8_t *dest;
@@ -85,20 +88,30 @@ static void vc1_put_signed_blocks_clamped(VC1Context *v)
                 if (i > 3 ? v->mb_type[0][s->block_index[i] - s->block_wrap[i] - 1] :
                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i] - 2]) {
                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + ((i & 1) - 2) * 8;
-                    s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][i],
-                                                      i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize - 8 : dest,
-                                                      i > 3 ? s->uvlinesize : s->linesize);
+                    if (put_signed)
+                        s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][block_map[i]],
+                                                          i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize - 8 : dest,
+                                                          i > 3 ? s->uvlinesize : s->linesize);
+                    else
+                        s->idsp.put_pixels_clamped(v->block[v->topleft_blk_idx][block_map[i]],
+                                                   i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize - 8 : dest,
+                                                   i > 3 ? s->uvlinesize : s->linesize);
                 }
             }
         }
-        if (s->mb_x == s->mb_width - 1) {
+        if (s->mb_x == v->end_mb_x - 1) {
             for (i = 0; i < block_count; i++) {
                 if (i > 3 ? v->mb_type[0][s->block_index[i] - s->block_wrap[i]] :
                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i]]) {
                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + (i & 1) * 8;
-                    s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][i],
-                                                      i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize : dest,
-                                                      i > 3 ? s->uvlinesize : s->linesize);
+                    if (put_signed)
+                        s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][block_map[i]],
+                                                          i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize : dest,
+                                                          i > 3 ? s->uvlinesize : s->linesize);
+                    else
+                        s->idsp.put_pixels_clamped(v->block[v->top_blk_idx][block_map[i]],
+                                                   i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize : dest,
+                                                   i > 3 ? s->uvlinesize : s->linesize);
                 }
             }
         }
@@ -114,13 +127,18 @@ static void vc1_put_signed_blocks_clamped(VC1Context *v)
                         dest = s->dest[0] + ((i & 2) >> 1) * s->linesize + ((i & 1) - 2) * 8;
                     else
                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + ((i & 1) - 2) * 8;
-                    s->idsp.put_signed_pixels_clamped(v->block[v->left_blk_idx][i],
-                                                      i > 3 ? s->dest[i - 3] - 8 : dest,
-                                                      i > 3 ? s->uvlinesize : s->linesize << fieldtx);
+                    if (put_signed)
+                        s->idsp.put_signed_pixels_clamped(v->block[v->left_blk_idx][block_map[i]],
+                                                          i > 3 ? s->dest[i - 3] - 8 : dest,
+                                                          i > 3 ? s->uvlinesize : s->linesize << fieldtx);
+                    else
+                        s->idsp.put_pixels_clamped(v->block[v->left_blk_idx][block_map[i]],
+                                                   i > 3 ? s->dest[i - 3] - 8 : dest,
+                                                   i > 3 ? s->uvlinesize : s->linesize << fieldtx);
                 }
             }
         }
-        if (s->mb_x == s->mb_width - 1) {
+        if (s->mb_x == v->end_mb_x - 1) {
             if (v->fcm == ILACE_FRAME)
                 fieldtx = v->fieldtx_plane[s->mb_y * s->mb_stride + s->mb_x];
             for (i = 0; i < block_count; i++) {
@@ -129,9 +147,14 @@ static void vc1_put_signed_blocks_clamped(VC1Context *v)
                         dest = s->dest[0] + ((i & 2) >> 1) * s->linesize + (i & 1) * 8;
                     else
                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + (i & 1) * 8;
-                    s->idsp.put_signed_pixels_clamped(v->block[v->cur_blk_idx][i],
-                                                      i > 3 ? s->dest[i - 3] : dest,
-                                                      i > 3 ? s->uvlinesize : s->linesize << fieldtx);
+                    if (put_signed)
+                        s->idsp.put_signed_pixels_clamped(v->block[v->cur_blk_idx][block_map[i]],
+                                                          i > 3 ? s->dest[i - 3] : dest,
+                                                          i > 3 ? s->uvlinesize : s->linesize << fieldtx);
+                    else
+                        s->idsp.put_pixels_clamped(v->block[v->cur_blk_idx][block_map[i]],
+                                                   i > 3 ? s->dest[i - 3] : dest,
+                                                   i > 3 ? s->uvlinesize : s->linesize << fieldtx);
                 }
             }
         }
@@ -160,13 +183,13 @@ static void vc1_put_signed_blocks_clamped(VC1Context *v)
         int edges = 0;                                         \
         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \
             if (v->dqbilevel) {                                \
-                mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \
+                mquant = (get_bits1(gb)) ? -v->altpq : v->pq;  \
             } else {                                           \
                 mqdiff = get_bits(gb, 3);                      \
                 if (mqdiff != 7)                               \
-                    mquant = v->pq + mqdiff;                   \
+                    mquant = -v->pq - mqdiff;                  \
                 else                                           \
-                    mquant = get_bits(gb, 5);                  \
+                    mquant = -get_bits(gb, 5);                 \
             }                                                  \
         }                                                      \
         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \
@@ -176,14 +199,15 @@ static void vc1_put_signed_blocks_clamped(VC1Context *v)
         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \
             edges = 15;                                        \
         if ((edges&1) && !s->mb_x)                             \
-            mquant = v->altpq;                                 \
-        if ((edges&2) && s->first_slice_line)                  \
-            mquant = v->altpq;                                 \
+            mquant = -v->altpq;                                \
+        if ((edges&2) && !s->mb_y)                             \
+            mquant = -v->altpq;                                \
         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \
-            mquant = v->altpq;                                 \
-        if ((edges&8) && s->mb_y == (s->mb_height - 1))        \
-            mquant = v->altpq;                                 \
-        if (!mquant || mquant > 31) {                          \
+            mquant = -v->altpq;                                \
+        if ((edges&8) &&                                       \
+            s->mb_y == ((s->mb_height >> v->field_mode) - 1))  \
+            mquant = -v->altpq;                                \
+        if (!mquant || mquant > 31 || mquant < -31) {                          \
             av_log(v->s.avctx, AV_LOG_ERROR,                   \
                    "Overriding invalid mquant %d\n", mquant);  \
             mquant = 1;                                        \
@@ -388,7 +412,7 @@ static inline int ff_vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
     int dqscale_index;
 
     /* scale predictors if needed */
-    q1 = s->current_picture.qscale_table[mb_pos];
+    q1 = FFABS(s->current_picture.qscale_table[mb_pos]);
     dqscale_index = s->y_dc_scale_table[q1] - 1;
     if (dqscale_index < 0)
         return 0;
@@ -404,12 +428,12 @@ static inline int ff_vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
     a = dc_val[ - wrap];
 
     if (c_avail && (n != 1 && n != 3)) {
-        q2 = s->current_picture.qscale_table[mb_pos - 1];
+        q2 = FFABS(s->current_picture.qscale_table[mb_pos - 1]);
         if (q2 && q2 != q1)
             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
     }
     if (a_avail && (n != 2 && n != 3)) {
-        q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
+        q2 = FFABS(s->current_picture.qscale_table[mb_pos - s->mb_stride]);
         if (q2 && q2 != q1)
             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
     }
@@ -419,7 +443,7 @@ static inline int ff_vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
             off--;
         if (n != 2)
             off -= s->mb_stride;
-        q2 = s->current_picture.qscale_table[off];
+        q2 = FFABS(s->current_picture.qscale_table[off]);
         if (q2 && q2 != q1)
             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
     }
@@ -700,6 +724,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
     int scale;
     int q1, q2 = 0;
     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
+    int quant = FFABS(mquant);
 
     /* Get DC differential */
     if (n < 4) {
@@ -712,7 +737,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
         return -1;
     }
     if (dcdiff) {
-        const int m = (mquant == 1 || mquant == 2) ? 3 - mquant : 0;
+        const int m = (quant == 1 || quant == 2) ? 3 - quant : 0;
         if (dcdiff == 119 /* ESC index value */) {
             dcdiff = get_bits(gb, 8 + m);
         } else {
@@ -724,7 +749,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
     }
 
     /* Prediction */
-    dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);
+    dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, quant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);
     *dc_val = dcdiff;
 
     /* Store the quantized DC coeff, used for prediction */
@@ -738,7 +763,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
     if (!a_avail && !c_avail)
         use_pred = 0;
 
-    scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);
+    scale = quant * 2 + ((mquant < 0) ? 0 : v->halfpq);
 
     ac_val  = s->ac_val[0][s->block_index[n]];
     ac_val2 = ac_val;
@@ -804,11 +829,12 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
                 ac_val += 8;
             }
             /* scale predictors if needed*/
+            q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;
+            if (q1 < 1)
+                return AVERROR_INVALIDDATA;
+            if (q2)
+                q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;
             if (q2 && q1 != q2) {
-                q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
-                if (q1 < 1)
-                    return AVERROR_INVALIDDATA;
-                q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
                 for (k = 1; k < 8; k++)
                     block[k << sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
             } else {
@@ -827,7 +853,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
             if (block[k]) {
                 block[k] *= scale;
                 if (!v->pquantizer)
-                    block[k] += (block[k] < 0) ? -mquant : mquant;
+                    block[k] += (block[k] < 0) ? -quant : quant;
             }
 
     } else { // no AC coeffs
@@ -846,18 +872,19 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
                 ac_val2 += 8;
             }
             memcpy(ac_val2, ac_val, 8 * 2);
+            q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;
+            if (q1 < 1)
+                return AVERROR_INVALIDDATA;
+            if (q2)
+                q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;
             if (q2 && q1 != q2) {
-                q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
-                q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
-                if (q1 < 1)
-                    return AVERROR_INVALIDDATA;
                 for (k = 1; k < 8; k++)
                     ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
             }
             for (k = 1; k < 8; k++) {
                 block[k << sh] = ac_val2[k] * scale;
                 if (!v->pquantizer && block[k << sh])
-                    block[k << sh] += (block[k << sh] < 0) ? -mquant : mquant;
+                    block[k << sh] += (block[k << sh] < 0) ? -quant : quant;
             }
         }
     }
@@ -890,15 +917,16 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
     int use_pred = s->ac_pred;
     int scale;
     int q1, q2 = 0;
+    int quant = FFABS(mquant);
 
     s->bdsp.clear_block(block);
 
     /* XXX: Guard against dumb values of mquant */
-    mquant = av_clip_uintp2(mquant, 5);
+    quant = av_clip_uintp2(quant, 5);
 
     /* Set DC scale - y and c use the same */
-    s->y_dc_scale = s->y_dc_scale_table[mquant];
-    s->c_dc_scale = s->c_dc_scale_table[mquant];
+    s->y_dc_scale = s->y_dc_scale_table[quant];
+    s->c_dc_scale = s->c_dc_scale_table[quant];
 
     /* Get DC differential */
     if (n < 4) {
@@ -911,7 +939,7 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
         return -1;
     }
     if (dcdiff) {
-        const int m = (mquant == 1 || mquant == 2) ? 3 - mquant : 0;
+        const int m = (quant == 1 || quant == 2) ? 3 - quant : 0;
         if (dcdiff == 119 /* ESC index value */) {
             dcdiff = get_bits(gb, 8 + m);
         } else {
@@ -923,7 +951,7 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
     }
 
     /* Prediction */
-    dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);
+    dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, quant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);
     *dc_val = dcdiff;
 
     /* Store the quantized DC coeff, used for prediction */
@@ -944,7 +972,7 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
     ac_val = s->ac_val[0][s->block_index[n]];
     ac_val2 = ac_val;
 
-    scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);
+    scale = quant * 2 + ((mquant < 0) ? 0 : v->halfpq);
 
     if (dc_pred_dir) //left
         ac_val -= 16;
@@ -988,12 +1016,12 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
         /* apply AC prediction if needed */
         if (use_pred) {
             /* scale predictors if needed*/
+            q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;
+            if (q1 < 1)
+                return AVERROR_INVALIDDATA;
+            if (q2)
+                q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;
             if (q2 && q1 != q2) {
-                q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
-                q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
-
-                if (q1 < 1)
-                    return AVERROR_INVALIDDATA;
                 if (dc_pred_dir) { // left
                     for (k = 1; k < 8; k++)
                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
@@ -1022,7 +1050,7 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
             if (block[k]) {
                 block[k] *= scale;
                 if (!v->pquantizer)
-                    block[k] += (block[k] < 0) ? -mquant : mquant;
+                    block[k] += (block[k] < 0) ? -quant : quant;
             }
 
         if (use_pred) i = 63;
@@ -1033,11 +1061,12 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
         if (dc_pred_dir) { // left
             if (use_pred) {
                 memcpy(ac_val2, ac_val, 8 * 2);
+                q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;
+                if (q1 < 1)
+                    return AVERROR_INVALIDDATA;
+                if (q2)
+                    q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;
                 if (q2 && q1 != q2) {
-                    q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
-                    q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
-                    if (q1 < 1)
-                        return AVERROR_INVALIDDATA;
                     for (k = 1; k < 8; k++)
                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
                 }
@@ -1045,11 +1074,12 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
         } else { // top
             if (use_pred) {
                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);
+                q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;
+                if (q1 < 1)
+                    return AVERROR_INVALIDDATA;
+                if (q2)
+                    q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;
                 if (q2 && q1 != q2) {
-                    q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
-                    q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
-                    if (q1 < 1)
-                        return AVERROR_INVALIDDATA;
                     for (k = 1; k < 8; k++)
                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
                 }
@@ -1062,13 +1092,13 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
                 for (k = 1; k < 8; k++) {
                     block[k << v->left_blk_sh] = ac_val2[k] * scale;
                     if (!v->pquantizer && block[k << v->left_blk_sh])
-                        block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;
+                        block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -quant : quant;
                 }
             } else { // top
                 for (k = 1; k < 8; k++) {
                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;
                     if (!v->pquantizer && block[k << v->top_blk_sh])
-                        block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;
+                        block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -quant : quant;
                 }
             }
             i = 63;
@@ -1093,6 +1123,7 @@ static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
     int scale, off, idx, last, skip, value;
     int ttblk = ttmb & 7;
     int pat = 0;
+    int quant = FFABS(mquant);
 
     s->bdsp.clear_block(block);
 
@@ -1113,7 +1144,7 @@ static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)
             ttblk = TT_4X8;
     }
-    scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);
+    scale = quant * 2 + ((mquant < 0) ? 0 : v->halfpq);
 
     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT
     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {
@@ -1140,7 +1171,7 @@ static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
                 idx = v->zzi_8x8[i++];
             block[idx] = value * scale;
             if (!v->pquantizer)
-                block[idx] += (block[idx] < 0) ? -mquant : mquant;
+                block[idx] += (block[idx] < 0) ? -quant : quant;
         }
         if (!skip_block) {
             if (i == 1)
@@ -1168,7 +1199,7 @@ static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];
                 block[idx + off] = value * scale;
                 if (!v->pquantizer)
-                    block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
+                    block[idx + off] += (block[idx + off] < 0) ? -quant : quant;
             }
             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {
                 if (i == 1)
@@ -1195,7 +1226,7 @@ static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;
                 block[idx] = value * scale;
                 if (!v->pquantizer)
-                    block[idx] += (block[idx] < 0) ? -mquant : mquant;
+                    block[idx] += (block[idx] < 0) ? -quant : quant;
             }
             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
                 if (i == 1)
@@ -1222,7 +1253,7 @@ static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;
                 block[idx] = value * scale;
                 if (!v->pquantizer)
-                    block[idx] += (block[idx] < 0) ? -mquant : mquant;
+                    block[idx] += (block[idx] < 0) ? -quant : quant;
             }
             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
                 if (i == 1)
@@ -1320,18 +1351,18 @@ static int vc1_decode_p_mb(VC1Context *v)
                     if (i == 1 || i == 3 || s->mb_x)
                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
+                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, val, mquant,
                                            (i & 4) ? v->codingset2 : v->codingset);
                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                         continue;
-                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
                     if (v->rangeredfrm)
                         for (j = 0; j < 64; j++)
-                            v->block[v->cur_blk_idx][i][j] <<= 1;
+                            v->block[v->cur_blk_idx][block_map[i]][j] <<= 1;
                     block_cbp   |= 0xF << (i << 2);
                     block_intra |= 1 << i;
                 } else if (val) {
-                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb, first_block,
+                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb, first_block,
                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,
                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
                     block_cbp |= pat << (i << 2);
@@ -1421,18 +1452,18 @@ static int vc1_decode_p_mb(VC1Context *v)
                     if (i == 1 || i == 3 || s->mb_x)
                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, is_coded[i], mquant,
+                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, is_coded[i], mquant,
                                            (i & 4) ? v->codingset2 : v->codingset);
                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                         continue;
-                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
                     if (v->rangeredfrm)
                         for (j = 0; j < 64; j++)
-                            v->block[v->cur_blk_idx][i][j] <<= 1;
+                            v->block[v->cur_blk_idx][block_map[i]][j] <<= 1;
                     block_cbp   |= 0xF << (i << 2);
                     block_intra |= 1 << i;
                 } else if (is_coded[i]) {
-                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
+                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb,
                                              first_block, s->dest[dst_idx] + off,
                                              (i & 4) ? s->uvlinesize : s->linesize,
                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),
@@ -1461,7 +1492,7 @@ static int vc1_decode_p_mb(VC1Context *v)
 end:
     if (v->overlap && v->pq >= 9)
         ff_vc1_p_overlap_filter(v);
-    vc1_put_signed_blocks_clamped(v);
+    vc1_put_blocks_clamped(v, 1);
 
     v->cbp[s->mb_x]      = block_cbp;
     v->ttblk[s->mb_x]    = block_tt;
@@ -1549,8 +1580,8 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
             GET_MQUANT();
             s->current_picture.qscale_table[mb_pos] = mquant;
             /* Set DC scale - y and c use the same (not sure if necessary here) */
-            s->y_dc_scale = s->y_dc_scale_table[mquant];
-            s->c_dc_scale = s->c_dc_scale_table[mquant];
+            s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];
+            s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];
             dst_idx = 0;
             for (i = 0; i < 6; i++) {
                 v->a_avail = v->c_avail          = 0;
@@ -1563,11 +1594,11 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
                 if (i == 1 || i == 3 || s->mb_x)
                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-                vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
+                vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, val, mquant,
                                        (i & 4) ? v->codingset2 : v->codingset);
                 if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                     continue;
-                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
                 if (i < 4)
                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
                 else
@@ -1643,7 +1674,7 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
                 else
                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
                 if (val) {
-                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
+                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb,
                                              first_block, s->dest[dst_idx] + off,
                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
@@ -1672,7 +1703,7 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
     }
     if (v->overlap && v->pq >= 9)
         ff_vc1_p_overlap_filter(v);
-    vc1_put_signed_blocks_clamped(v);
+    vc1_put_blocks_clamped(v, 1);
 
     v->cbp[s->mb_x]      = block_cbp;
     v->ttblk[s->mb_x]    = block_tt;
@@ -1711,8 +1742,8 @@ static int vc1_decode_p_mb_intfi(VC1Context *v)
         GET_MQUANT();
         s->current_picture.qscale_table[mb_pos] = mquant;
         /* Set DC scale - y and c use the same (not sure if necessary here) */
-        s->y_dc_scale = s->y_dc_scale_table[mquant];
-        s->c_dc_scale = s->c_dc_scale_table[mquant];
+        s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];
+        s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];
         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
         mb_has_coeffs = idx_mbmode & 1;
         if (mb_has_coeffs)
@@ -1729,11 +1760,11 @@ static int vc1_decode_p_mb_intfi(VC1Context *v)
             if (i == 1 || i == 3 || s->mb_x)
                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-            vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
+            vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, val, mquant,
                                    (i & 4) ? v->codingset2 : v->codingset);
             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                 continue;
-            v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+            v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
             block_cbp |= 0xf << (i << 2);
         }
@@ -1778,7 +1809,7 @@ static int vc1_decode_p_mb_intfi(VC1Context *v)
             val = ((cbp >> (5 - i)) & 1);
             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;
             if (val) {
-                pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
+                pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb,
                                          first_block, s->dest[dst_idx] + off,
                                          (i & 4) ? s->uvlinesize : s->linesize,
                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),
@@ -1792,7 +1823,7 @@ static int vc1_decode_p_mb_intfi(VC1Context *v)
     }
     if (v->overlap && v->pq >= 9)
         ff_vc1_p_overlap_filter(v);
-    vc1_put_signed_blocks_clamped(v);
+    vc1_put_blocks_clamped(v, 1);
 
     v->cbp[s->mb_x]      = block_cbp;
     v->ttblk[s->mb_x]    = block_tt;
@@ -1989,8 +2020,8 @@ static void vc1_decode_b_mb_intfi(VC1Context *v)
         GET_MQUANT();
         s->current_picture.qscale_table[mb_pos] = mquant;
         /* Set DC scale - y and c use the same (not sure if necessary here) */
-        s->y_dc_scale = s->y_dc_scale_table[mquant];
-        s->c_dc_scale = s->c_dc_scale_table[mquant];
+        s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];
+        s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];
         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
         mb_has_coeffs = idx_mbmode & 1;
         if (mb_has_coeffs)
@@ -2165,41 +2196,6 @@ static int vc1_decode_b_mb_intfr(VC1Context *v)
         }
     }
 
-    if (v->dmb_is_raw)
-        direct = get_bits1(gb);
-    else
-        direct = v->direct_mb_plane[mb_pos];
-
-    if (direct) {
-        if (s->next_picture_ptr->field_picture)
-            av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");
-        s->mv[0][0][0] = s->current_picture.motion_val[0][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 0, s->quarter_sample);
-        s->mv[0][0][1] = s->current_picture.motion_val[0][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 0, s->quarter_sample);
-        s->mv[1][0][0] = s->current_picture.motion_val[1][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 1, s->quarter_sample);
-        s->mv[1][0][1] = s->current_picture.motion_val[1][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 1, s->quarter_sample);
-
-        if (twomv) {
-            s->mv[0][2][0] = s->current_picture.motion_val[0][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 0, s->quarter_sample);
-            s->mv[0][2][1] = s->current_picture.motion_val[0][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 0, s->quarter_sample);
-            s->mv[1][2][0] = s->current_picture.motion_val[1][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 1, s->quarter_sample);
-            s->mv[1][2][1] = s->current_picture.motion_val[1][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 1, s->quarter_sample);
-
-            for (i = 1; i < 4; i += 2) {
-                s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];
-                s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];
-                s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];
-                s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];
-            }
-        } else {
-            for (i = 1; i < 4; i++) {
-                s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];
-                s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];
-                s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];
-                s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];
-            }
-        }
-    }
-
     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
         for (i = 0; i < 4; i++) {
             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;
@@ -2218,8 +2214,8 @@ static int vc1_decode_b_mb_intfr(VC1Context *v)
         GET_MQUANT();
         s->current_picture.qscale_table[mb_pos] = mquant;
         /* Set DC scale - y and c use the same (not sure if necessary here) */
-        s->y_dc_scale = s->y_dc_scale_table[mquant];
-        s->c_dc_scale = s->c_dc_scale_table[mquant];
+        s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];
+        s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];
         dst_idx = 0;
         for (i = 0; i < 6; i++) {
             v->a_avail = v->c_avail          = 0;
@@ -2250,6 +2246,42 @@ static int vc1_decode_b_mb_intfr(VC1Context *v)
         }
     } else {
         s->mb_intra = v->is_intra[s->mb_x] = 0;
+
+        if (v->dmb_is_raw)
+            direct = get_bits1(gb);
+        else
+            direct = v->direct_mb_plane[mb_pos];
+
+        if (direct) {
+            if (s->next_picture_ptr->field_picture)
+                av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");
+            s->mv[0][0][0] = s->current_picture.motion_val[0][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 0, s->quarter_sample);
+            s->mv[0][0][1] = s->current_picture.motion_val[0][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 0, s->quarter_sample);
+            s->mv[1][0][0] = s->current_picture.motion_val[1][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 1, s->quarter_sample);
+            s->mv[1][0][1] = s->current_picture.motion_val[1][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 1, s->quarter_sample);
+
+            if (twomv) {
+                s->mv[0][2][0] = s->current_picture.motion_val[0][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 0, s->quarter_sample);
+                s->mv[0][2][1] = s->current_picture.motion_val[0][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 0, s->quarter_sample);
+                s->mv[1][2][0] = s->current_picture.motion_val[1][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 1, s->quarter_sample);
+                s->mv[1][2][1] = s->current_picture.motion_val[1][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 1, s->quarter_sample);
+
+                for (i = 1; i < 4; i += 2) {
+                    s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];
+                    s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];
+                    s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];
+                    s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];
+                }
+            } else {
+                for (i = 1; i < 4; i++) {
+                    s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];
+                    s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];
+                    s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];
+                    s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];
+                }
+            }
+        }
+
         if (!direct) {
             if (skipped || !s->mb_intra) {
                 bmvtype = decode012(gb);
@@ -2508,30 +2540,27 @@ static void vc1_decode_i_blocks(VC1Context *v)
     s->mb_x = s->mb_y = 0;
     s->mb_intra         = 1;
     s->first_slice_line = 1;
-    for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {
+    for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
         s->mb_x = 0;
         init_block_index(v);
         for (; s->mb_x < v->end_mb_x; s->mb_x++) {
-            uint8_t *dst[6];
             ff_update_block_index(s);
-            dst[0] = s->dest[0];
-            dst[1] = dst[0] + 8;
-            dst[2] = s->dest[0] + s->linesize * 8;
-            dst[3] = dst[2] + 8;
-            dst[4] = s->dest[1];
-            dst[5] = s->dest[2];
-            s->bdsp.clear_blocks(s->block[0]);
+            s->bdsp.clear_blocks(v->block[v->cur_blk_idx][0]);
             mb_pos = s->mb_x + s->mb_y * s->mb_width;
             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;
             s->current_picture.qscale_table[mb_pos]                = v->pq;
-            s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
-            s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
+            for (int i = 0; i < 4; i++) {
+                s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
+                s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
+            }
 
             // do actual MB decoding and displaying
             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
             v->s.ac_pred = get_bits1(&v->s.gb);
 
             for (k = 0; k < 6; k++) {
+                v->mb_type[0][s->block_index[k]] = 1;
+
                 val = ((cbp >> (5 - k)) & 1);
 
                 if (k < 4) {
@@ -2541,52 +2570,30 @@ static void vc1_decode_i_blocks(VC1Context *v)
                 }
                 cbp |= val << (5 - k);
 
-                vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);
+                vc1_decode_i_block(v, v->block[v->cur_blk_idx][block_map[k]], k, val, (k < 4) ? v->codingset : v->codingset2);
 
                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                     continue;
-                v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);
-                if (v->pq >= 9 && v->overlap) {
-                    if (v->rangeredfrm)
+                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[k]]);
+            }
+
+            if (v->overlap && v->pq >= 9) {
+                ff_vc1_i_overlap_filter(v);
+                if (v->rangeredfrm)
+                    for (k = 0; k < 6; k++)
                         for (j = 0; j < 64; j++)
-                            s->block[k][j] <<= 1;
-                    s->idsp.put_signed_pixels_clamped(s->block[k], dst[k],
-                                                      k & 4 ? s->uvlinesize
-                                                            : s->linesize);
-                } else {
-                    if (v->rangeredfrm)
+                            v->block[v->cur_blk_idx][block_map[k]][j] <<= 1;
+                vc1_put_blocks_clamped(v, 1);
+            } else {
+                if (v->rangeredfrm)
+                    for (k = 0; k < 6; k++)
                         for (j = 0; j < 64; j++)
-                            s->block[k][j] = (s->block[k][j] - 64) << 1;
-                    s->idsp.put_pixels_clamped(s->block[k], dst[k],
-                                               k & 4 ? s->uvlinesize
-                                                     : s->linesize);
-                }
+                            v->block[v->cur_blk_idx][block_map[k]][j] = (v->block[v->cur_blk_idx][block_map[k]][j] - 64) << 1;
+                vc1_put_blocks_clamped(v, 0);
             }
 
-            if (v->pq >= 9 && v->overlap) {
-                if (s->mb_x) {
-                    v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);
-                    v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
-                    if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
-                        v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);
-                        v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);
-                    }
-                }
-                v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);
-                v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
-                if (!s->first_slice_line) {
-                    v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);
-                    v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);
-                    if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
-                        v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);
-                        v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);
-                    }
-                }
-                v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
-                v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
-            }
             if (v->s.loop_filter)
-                ff_vc1_loop_filter_iblk(v, v->pq);
+                ff_vc1_i_loop_filter(v);
 
             if (get_bits_count(&s->gb) > v->bits) {
                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);
@@ -2594,6 +2601,11 @@ static void vc1_decode_i_blocks(VC1Context *v)
                        get_bits_count(&s->gb), v->bits);
                 return;
             }
+
+            v->topleft_blk_idx = (v->topleft_blk_idx + 1) % (v->end_mb_x + 2);
+            v->top_blk_idx = (v->top_blk_idx + 1) % (v->end_mb_x + 2);
+            v->left_blk_idx = (v->left_blk_idx + 1) % (v->end_mb_x + 2);
+            v->cur_blk_idx = (v->cur_blk_idx + 1) % (v->end_mb_x + 2);
         }
         if (!v->s.loop_filter)
             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
@@ -2619,7 +2631,7 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
     int cbp, val;
     uint8_t *coded_val;
     int mb_pos;
-    int mquant = v->pq;
+    int mquant;
     int mqdiff;
     GetBitContext *gb = &s->gb;
 
@@ -2663,13 +2675,15 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
         s->mb_x = 0;
         init_block_index(v);
         for (;s->mb_x < s->mb_width; s->mb_x++) {
-            int16_t (*block)[64] = v->block[v->cur_blk_idx];
+            mquant = v->pq;
             ff_update_block_index(s);
-            s->bdsp.clear_blocks(block[0]);
+            s->bdsp.clear_blocks(v->block[v->cur_blk_idx][0]);
             mb_pos = s->mb_x + s->mb_y * s->mb_stride;
             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;
-            s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
-            s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
+            for (int i = 0; i < 4; i++) {
+                s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][0] = 0;
+                s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][1] = 0;
+            }
 
             // do actual MB decoding and displaying
             if (v->fieldtx_is_raw)
@@ -2687,8 +2701,8 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
 
             s->current_picture.qscale_table[mb_pos] = mquant;
             /* Set DC scale - y and c use the same */
-            s->y_dc_scale = s->y_dc_scale_table[mquant];
-            s->c_dc_scale = s->c_dc_scale_table[mquant];
+            s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];
+            s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];
 
             for (k = 0; k < 6; k++) {
                 v->mb_type[0][s->block_index[k]] = 1;
@@ -2705,17 +2719,17 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);
                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);
 
-                vc1_decode_i_block_adv(v, block[k], k, val,
+                vc1_decode_i_block_adv(v, v->block[v->cur_blk_idx][block_map[k]], k, val,
                                        (k < 4) ? v->codingset : v->codingset2, mquant);
 
                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                     continue;
-                v->vc1dsp.vc1_inv_trans_8x8(block[k]);
+                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[k]]);
             }
 
-            if (v->overlap && v->condover != CONDOVER_NONE)
+            if (v->overlap && (v->pq >= 9 || v->condover != CONDOVER_NONE))
                 ff_vc1_i_overlap_filter(v);
-            vc1_put_signed_blocks_clamped(v);
+            vc1_put_blocks_clamped(v, 1);
             if (v->s.loop_filter)
                 ff_vc1_i_loop_filter(v);