get those permutations straight
authorMike Melanson <mike@multimedia.cx>
Sun, 11 May 2003 02:51:07 +0000 (02:51 +0000)
committerMike Melanson <mike@multimedia.cx>
Sun, 11 May 2003 02:51:07 +0000 (02:51 +0000)
Originally committed as revision 1850 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vp3.c
libavcodec/vp3data.h

index 461be09..894e767 100644 (file)
@@ -862,7 +862,7 @@ static void init_dequantizer(Vp3DecodeContext *s)
      * the dequantization phase */
     for (i = 1; i < 64; i++) {
 
-        j = quant_index[i];
+        j = zigzag_index[i];
 
         s->intra_y_dequant[j] = vp31_intra_y_dequant[i] * quality_scale / 100;
         if (s->intra_y_dequant[j] < MIN_DEQUANT_VAL)
@@ -2065,6 +2065,7 @@ static void render_fragments(Vp3DecodeContext *s,
     int j;
     int16_t *dequantizer;
     DCTELEM dequant_block[64];
+    DCTELEM dequant_block_permuted[64];
     unsigned char *output_plane;
     unsigned char *last_plane;
     unsigned char *golden_plane;
@@ -2155,9 +2156,12 @@ static void render_fragments(Vp3DecodeContext *s,
                     i, s->all_fragments[i].coding_method, 
                     s->all_fragments[i].coeffs[0], dequantizer[0]);
                 for (j = 0; j < 64; j++)
-                    dequant_block[dequant_index[j]] =
+                    dequant_block[dezigzag_index[j]] =
                         s->all_fragments[i].coeffs[j] *
                         dequantizer[j];
+                for (j = 0; j < 64; j++)
+                    dequant_block_permuted[s->dsp.idct_permutation[j]] =
+                        dequant_block[j];
 
                 debug_idct("dequantized block:\n");
                 for (m = 0; m < 8; m++) {
@@ -2171,14 +2175,14 @@ static void render_fragments(Vp3DecodeContext *s,
                 /* invert DCT and place (or add) in final output */
 
                 if (s->all_fragments[i].coding_method == MODE_INTRA) {
-                    dequant_block[0] += 1024;
+                    dequant_block_permuted[0] += 1024;
                     s->dsp.idct_put(
                         output_plane + s->all_fragments[i].first_pixel,
-                        stride, dequant_block);
+                        stride, dequant_block_permuted);
                 } else {
                     s->dsp.idct_add(
                         output_plane + s->all_fragments[i].first_pixel,
-                        stride, dequant_block);
+                        stride, dequant_block_permuted);
                 }
 
                 debug_idct("block after idct_%s():\n",
@@ -2363,7 +2367,7 @@ static int vp3_decode_init(AVCodecContext *avctx)
 
     /* build quantization table */
     for (i = 0; i < 64; i++)
-        quant_index[dequant_index[i]] = i;
+        zigzag_index[dezigzag_index[i]] = i;
 
     /* work out the block mapping tables */
     s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int));
index 016b4e2..0021049 100644 (file)
@@ -60,7 +60,7 @@ static uint32_t vp31_quality_threshold[64] =
 };
 
 /* table used to convert natural order <-> zigzag order */
-static const int dequant_index[64] =
+static const int dezigzag_index[64] =
 {   0,  1,  8,  16,  9,  2,  3, 10,
     17, 24, 32, 25, 18, 11,  4,  5,
     12, 19, 26, 33, 40, 48, 41, 34,
@@ -71,8 +71,8 @@ static const int dequant_index[64] =
     53, 60, 61, 54, 47, 55, 62, 63
 };
 
-/* inverse of dequant index */
-static int quant_index[64];
+/* inverse of dezigzag index */
+static int zigzag_index[64];
 
 static const uint16_t dc_bias[16][32][2] = {
   {  /* DC bias table 0 */