missmatch control for mpeg2 intra dequantization if bitexact=1

Originally committed as revision 5328 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/i386/mpegvideo_mmx.c

@@ -699,7 +699,8 @@ void MPV_common_init_mmx(MpegEncContext *s)
         s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_mmx;
         s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_mmx;
         s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_mmx;
-        s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_mmx;
+        if(!(s->flags & CODEC_FLAG_BITEXACT))
+            s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_mmx;
         s->dct_unquantize_mpeg2_inter = dct_unquantize_mpeg2_inter_mmx;
 
         draw_edges = draw_edges_mmx;

libavcodec/mpegvideo.c

@@ -47,6 +47,8 @@ static void dct_unquantize_mpeg1_inter_c(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale);
 static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale);
+static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
+                                   DCTELEM *block, int n, int qscale);
 static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale);
 static void dct_unquantize_h263_intra_c(MpegEncContext *s,
@@ -266,6 +268,8 @@ int DCT_common_init(MpegEncContext *s)
     s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c;
     s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_c;
     s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_c;
+    if(s->flags & CODEC_FLAG_BITEXACT)
+        s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_bitexact;
     s->dct_unquantize_mpeg2_inter = dct_unquantize_mpeg2_inter_c;
 
 #ifdef CONFIG_ENCODERS
@@ -6527,6 +6531,39 @@ static void dct_unquantize_mpeg2_intra_c(MpegEncContext *s,
     }
 }
 
+static void dct_unquantize_mpeg2_intra_bitexact(MpegEncContext *s,
+                                   DCTELEM *block, int n, int qscale)
+{
+    int i, level, nCoeffs;
+    const uint16_t *quant_matrix;
+    int sum=-1;
+
+    if(s->alternate_scan) nCoeffs= 63;
+    else nCoeffs= s->block_last_index[n];
+
+    if (n < 4)
+        block[0] = block[0] * s->y_dc_scale;
+    else
+        block[0] = block[0] * s->c_dc_scale;
+    quant_matrix = s->intra_matrix;
+    for(i=1;i<=nCoeffs;i++) {
+        int j= s->intra_scantable.permutated[i];
+        level = block[j];
+        if (level) {
+            if (level < 0) {
+                level = -level;
+                level = (int)(level * qscale * quant_matrix[j]) >> 3;
+                level = -level;
+            } else {
+                level = (int)(level * qscale * quant_matrix[j]) >> 3;
+            }
+            block[j] = level;
+            sum+=level;
+        }
+    }
+    block[63]^=sum&1;
+}
+
 static void dct_unquantize_mpeg2_inter_c(MpegEncContext *s,
                                    DCTELEM *block, int n, int qscale)
 {

tests/ffmpeg.regression.ref

@@ -3,25 +3,25 @@ ffmpeg regression test
 734274 ./data/a-mpeg1.mpg
 eff964f940a35427fa9e8d35fb4f5699 *./data/out.yuv
 stddev:  7.66 PSNR:30.43 bytes:7602176
-5e1e8136cf2565f7cfbcfc7eda8d8f2b *./data/a-mpeg2.mpg
+a60d3fb60982786b9761a07c24664e9c *./data/a-mpeg2.mpg
-750226 ./data/a-mpeg2.mpg
+747312 ./data/a-mpeg2.mpg
-27ddfd3e44537661eb14b96129a055ef *./data/out.yuv
+f5b8b9c2a5e162b6c01d6b299d03b117 *./data/out.yuv
-stddev:  7.69 PSNR:30.40 bytes:7602176
+stddev:  7.69 PSNR:30.39 bytes:7602176
-004245d17ae9322ea3c6dc4b0f0554d6 *./data/a-mpeg2.mpg
+a34af358ee5b5dab19d37ee29f1927b2 *./data/a-mpeg2.mpg
-746381 ./data/a-mpeg2.mpg
+748099 ./data/a-mpeg2.mpg
-c7b9a71245912671889849ed560b67d3 *./data/out.yuv
+555f76a5df78088411b83f5faf334762 *./data/out.yuv
-stddev:  7.69 PSNR:30.40 bytes:7602176
+stddev:  7.69 PSNR:30.39 bytes:7602176
-59d4471ff2a9749824b4d813900afdfc *./data/a-mpeg2i.mpg
+5173c8b2e244a4ac12cca31ae1c19a0d *./data/a-mpeg2i.mpg
-754366 ./data/a-mpeg2i.mpg
+756437 ./data/a-mpeg2i.mpg
-ddf889858529d09c8fe31c701deacd16 *./data/out.yuv
+e29b8da1aeb96bb9c1a43a400958a11d *./data/out.yuv
-stddev:  7.71 PSNR:30.37 bytes:7602176
+stddev:  7.69 PSNR:30.39 bytes:7602176
-d0830d912bc594eeec4d3ec60d727d15 *./data/a-mpeg2thread.mpg
+367414ac9225222fc8ec9352485a7637 *./data/a-mpeg2thread.mpg
-816727 ./data/a-mpeg2thread.mpg
+820348 ./data/a-mpeg2thread.mpg
-664c5ac9185522238813c476b7b0570a *./data/out.yuv
+6b820ffc74de50cc863b41d51f72c22b *./data/out.yuv
 stddev:  7.64 PSNR:30.45 bytes:7602176
-d948e29c0be5a78b75c0c7f3ecd8d29d *./data/a-mpeg2reuse.mpg
+edb3e58ea66de2e9b32713daf9b5c3f1 *./data/a-mpeg2reuse.mpg
-2114000 ./data/a-mpeg2reuse.mpg
+2119706 ./data/a-mpeg2reuse.mpg
-55e78a12330b374db6910447db78ad46 *./data/out.yuv
+1dab2eaca5320fe01afbe9596b2bd6cc *./data/out.yuv
 stddev:  7.68 PSNR:30.41 bytes:7602176
 09086e7b020e9425a8f7e05372dbcfcd *./data/a-msmpeg4v2.avi
 642666 ./data/a-msmpeg4v2.avi

tests/libav.regression.ref

@@ -10,9 +10,9 @@ ffmpeg regression test
 90784a1b9589095f20fc6bcc0cc23cc4 *./data/b-libav.mpg
  387072 ./data/b-libav.mpg
 ./data/b-libav.mpg CRC=0x8b644837
-c9050b51f6d6636cdda3160d43463bc3 *./data/b-libav.ts
+2933a367c996b49f4b7e66a481fb334e *./data/b-libav.ts
- 479400 ./data/b-libav.ts
+476768 ./data/b-libav.ts
-./data/b-libav.ts CRC=0x7968c81f
+./data/b-libav.ts CRC=0x0dd7fc5f
 57a8dfc7926802bb337a9d8918de94a8 *./data/b-libav.swf
   41816 ./data/b-libav.swf
 ./data/b-libav.swf CRC=0x2b273fea

tests/rotozoom.regression.ref

@@ -3,26 +3,26 @@ ffmpeg regression test
 193481 ./data/a-mpeg1.mpg
 ce245faede79604bb268f93689a490d6 *./data/out.yuv
 stddev:  4.96 PSNR:34.21 bytes:7602176
-a59a2a0d04768b9dcd51ab13f751f0ef *./data/a-mpeg2.mpg
+f0310ea9b9a4f37c1a4dd0d4985a3f81 *./data/a-mpeg2.mpg
-199231 ./data/a-mpeg2.mpg
+199396 ./data/a-mpeg2.mpg
-bccb76fc30fca87cc401e41f4c0ef154 *./data/out.yuv
+94581e9516461557b194aeefaaba3835 *./data/out.yuv
 stddev:  4.97 PSNR:34.18 bytes:7602176
-eba2bff497863dbe8dad4a771fe14910 *./data/a-mpeg2.mpg
+374bd257b96328935926b350b0c5cada *./data/a-mpeg2.mpg
-198404 ./data/a-mpeg2.mpg
+198338 ./data/a-mpeg2.mpg
-107af0aac7f32378988469bd6eae9c31 *./data/out.yuv
+f464b420ae24c1e453df8d3e5ef9140d *./data/out.yuv
-stddev:  4.98 PSNR:34.17 bytes:7602176
+stddev:  4.98 PSNR:34.18 bytes:7602176
-8d0a7f9b0b4cb5a7e4980051994e1390 *./data/a-mpeg2i.mpg
+611f1707acde262e615511eab55d9f74 *./data/a-mpeg2i.mpg
-205006 ./data/a-mpeg2i.mpg
+205165 ./data/a-mpeg2i.mpg
-d215d0f3cbbfb687a929ccf2dd1a034a *./data/out.yuv
+8577a8f6bc2ad86fe93e0d1ded6df70a *./data/out.yuv
-stddev:  4.99 PSNR:34.16 bytes:7602176
+stddev:  4.98 PSNR:34.16 bytes:7602176
-20f7d29ae2d7eed5742b22c9d2ed5281 *./data/a-mpeg2thread.mpg
+6a23281e0e268db8df62e9e9957ee583 *./data/a-mpeg2thread.mpg
-184113 ./data/a-mpeg2thread.mpg
+183955 ./data/a-mpeg2thread.mpg
-b6cc35f5619c6f44c1c2bfbf01e55aec *./data/out.yuv
+38441603e2201ddb01632ba3411a6bb8 *./data/out.yuv
 stddev:  4.76 PSNR:34.56 bytes:7602176
-57bc4a05ff7053dc988530714e91f6c2 *./data/a-mpeg2reuse.mpg
+c9f6617461caee57ccb6d438761527c8 *./data/a-mpeg2reuse.mpg
-397335 ./data/a-mpeg2reuse.mpg
+396729 ./data/a-mpeg2reuse.mpg
-4f6b4006112516a6f939d61876f78eca *./data/out.yuv
+b10aec71132301cad001070e8ad46b7d *./data/out.yuv
-stddev:  4.77 PSNR:34.54 bytes:7602176
+stddev:  4.77 PSNR:34.55 bytes:7602176
 dc68a5115d1bf1bb2eb2ce9bb237bd79 *./data/a-msmpeg4v2.avi
 129504 ./data/a-msmpeg4v2.avi
 25b5ba0b024fcd4028e707ffbeb80f55 *./data/out.yuv