avcodec/vc1: fix mquant calculation
authorJerome Borsboom <jerome.borsboom@carpalis.nl>
Sat, 28 Apr 2018 15:15:32 +0000 (17:15 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Sun, 29 Apr 2018 01:57:33 +0000 (03:57 +0200)
In vc1_decode_i_blocks_adv mquant needs to be reset to its default value for
each macroblock, instead of once at the beginning of the slice.

DQPROFILE specifies which macroblocks can have an alternative quantizer step
size. When DQPROFILE specifies edges, the selection is applicable to the edges
of the picture. Slice edges are not selected by DQPROFILE.

Signed-off-by: Jerome Borsboom <jerome.borsboom@carpalis.nl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/vc1_block.c

index 7cabe49..ace1b3e 100644 (file)
@@ -177,7 +177,7 @@ static void vc1_put_signed_blocks_clamped(VC1Context *v)
             edges = 15;                                        \
         if ((edges&1) && !s->mb_x)                             \
             mquant = -v->altpq;                                \
-        if ((edges&2) && s->first_slice_line)                  \
+        if ((edges&2) && !s->mb_y)                             \
             mquant = -v->altpq;                                \
         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \
             mquant = -v->altpq;                                \
@@ -2626,7 +2626,7 @@ 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;
 
@@ -2671,6 +2671,7 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
         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]);
             mb_pos = s->mb_x + s->mb_y * s->mb_stride;