fix bug of setting dest x position when rotate 90

@@ -560,7 +560,7 @@ int CAVTranscoder::open_output_file(const char *filename)
 			for (int i = 0; i < h; i++)	{
 				unsigned char * psrc = startSrcY + i * pSrcFrame->linesize[0];
 				unsigned char * psrc_end = psrc + w;
-				unsigned char * pdst = pDstFrame->data[0] + y*pDstFrame->linesize[0] + h -1 - i;
+				unsigned char * pdst = pDstFrame->data[0] + y*pDstFrame->linesize[0] + h -1 - i + x;
 				for (; psrc < psrc_end; psrc++, pdst+=pDstFrame->linesize[0]) {
 					*pdst = *psrc;
 				}
@@ -570,7 +570,7 @@ int CAVTranscoder::open_output_file(const char *filename)
 			for (int i = 0; i < h/2; i++)	{
 				unsigned char * psrc = startSrcU + i* pSrcFrame->linesize[1];
 				unsigned char * psrc_end = psrc + w/2;
-				unsigned char * pdst = pDstFrame->data[1] + y/2*pDstFrame->linesize[1] + h/2 -1 - i;
+				unsigned char * pdst = pDstFrame->data[1] + y/2*pDstFrame->linesize[1] + h/2 -1 - i +x/2;
 				for (; psrc < psrc_end; psrc++, pdst += pDstFrame->linesize[1]) {
 					*pdst = *psrc;
 				}
@@ -580,7 +580,7 @@ int CAVTranscoder::open_output_file(const char *filename)
 			for (int i = 0; i < h / 2; i++)	{
 				unsigned char * psrc = startSrcV + i* pSrcFrame->linesize[2];
 				unsigned char * psrc_end = psrc + w / 2;
-				unsigned char * pdst = pDstFrame->data[2] + y / 2 * pDstFrame->linesize[2] + h / 2 -1 - i;
+				unsigned char * pdst = pDstFrame->data[2] + y / 2 * pDstFrame->linesize[2] + h / 2 -1 - i + x/2;
 				for (; psrc < psrc_end; psrc++, pdst += pDstFrame->linesize[2]) {
 					*pdst = *psrc;
 				}
@@ -638,7 +638,7 @@ int CAVTranscoder::open_output_file(const char *filename)
 						fillDestFrame(pDstFrame, _studentFrame, (SRC_W - SRC_H) / 2, 240, (SRC_W - SRC_H) / 2, 0, SRC_H, SRC_H);
 					}
 				}
-				else if (_studentFrame->pkt_dts != 90){
+				else if (_studentFrame->pkt_dts == 90){
 					fillDestFrame(pDstFrame, _studentFrame, 0, 240);
 				}
 				else {