msvideo1enc: fix interframe encoding

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/msvideo1enc.c

@@ -110,7 +110,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                 bestscore = 0;
                 for(j = 0; j < 4; j++){
                     for(i = 0; i < 4*3; i++){
-                        int t = prevptr[x*3 + i + j*p->linesize[0]] - c->block[i + j*4*3];
+                        int t = prevptr[x*3 + i - j*3*avctx->width] - c->block[i + j*4*3];
                         bestscore += t*t;
                     }
                 }
@@ -204,14 +204,14 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                 for(j = 0; j < 4; j++)
                     for(i = 0; i < 4; i++)
                         for(k = 0; k < 3; k++)
-                            prevptr[i*3 + k - j*3*avctx->width] = c->avg[k];
+                            prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->avg[k];
                 break;
             case MODE_2COL:
                 for(j = 0; j < 4; j++){
                     for(i = 0; i < 4; i++){
                         flags |= (c->output[i + j*4]^1) << (i + j*4);
                         for(k = 0; k < 3; k++)
-                            prevptr[i*3 + k - j*3*avctx->width] = c->codebook[c->output[i + j*4]*3 + k];
+                            prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->codebook[c->output[i + j*4]*3 + k];
                     }
                 }
                 bytestream_put_le16(&dst, flags);
@@ -223,7 +223,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                     for(i = 0; i < 4; i++){
                         flags |= (c->output2[remap[i + j*4]]^1) << (i + j*4);
                         for(k = 0; k < 3; k++)
-                            prevptr[i*3 + k - j*3*avctx->width] = c->codebook2[(c->output2[remap[i+j*4]] + (i&2) + (j&2)*2)*3 + k];
+                            prevptr[x*3 + i*3 + k - j*3*avctx->width] = c->codebook2[(c->output2[remap[i+j*4]] + (i&2) + (j&2)*2)*3 + k];
                     }
                 }
                 bytestream_put_le16(&dst, flags);

tests/ref/fate/vsynth1-msvideo1

-afe516f762a598f3f9c7ae8a9f288d3e *tests/data/fate/vsynth1-msvideo1.avi
-2162264 tests/data/fate/vsynth1-msvideo1.avi
-ef76473f7be587dac7676a69835e43ce *tests/data/fate/vsynth1-msvideo1.out.rawvideo
-stddev:   11.80 PSNR: 26.69 MAXDIFF:  151 bytes:  7603200/  7603200
+75a0f6680e23a50477826caec1a41bb9 *tests/data/fate/vsynth1-msvideo1.avi
+2051904 tests/data/fate/vsynth1-msvideo1.avi
+f4605ac6df556a3ca7053c49aaac04d8 *tests/data/fate/vsynth1-msvideo1.out.rawvideo
+stddev:   11.89 PSNR: 26.62 MAXDIFF:  159 bytes:  7603200/  7603200

tests/ref/fate/vsynth2-msvideo1

-e70658b8b97eb4c7e63b2081c3a602de *tests/data/fate/vsynth2-msvideo1.avi
-1259308 tests/data/fate/vsynth2-msvideo1.avi
-cd83ffcbc73573044e3aead3094229e5 *tests/data/fate/vsynth2-msvideo1.out.rawvideo
-stddev:    7.42 PSNR: 30.72 MAXDIFF:  123 bytes:  7603200/  7603200
+8d7e8eb05771d0341d88c30892908960 *tests/data/fate/vsynth2-msvideo1.avi
+914572 tests/data/fate/vsynth2-msvideo1.avi
+9a6ac7c0171286f009d159b59fdc1154 *tests/data/fate/vsynth2-msvideo1.out.rawvideo
+stddev:    7.97 PSNR: 30.10 MAXDIFF:  123 bytes:  7603200/  7603200