support rotate 180,use preset superfast for h264 encoding

@@ -157,7 +157,7 @@ int CAVTranscoder::open_output_file(const char *filename)
 				enc_ctx->height = _nOutputHeight;
 				enc_ctx->width = _nOutputWidth;
 				enc_ctx->sample_aspect_ratio.den = 1;
-				enc_ctx->sample_aspect_ratio.num = 1;
+				enc_ctx->sample_aspect_ratio.num = 0;
 				/* take first format from list of supported formats */
 				enc_ctx->pix_fmt = AV_PIX_FMT_YUV420P;
 				/* video time_base can be set to whatever is handy and supported by encoder */
@@ -169,6 +169,11 @@ int CAVTranscoder::open_output_file(const char *filename)
 				enc_ctx->qmin = 10;
 				enc_ctx->qmax = 30;
 				enc_ctx->qcompress = 0.6;
+
+				AVDictionary * d = NULL;
+				char *k = av_strdup("preset");       // if your strings are already allocated,
+				char *v = av_strdup("ultrafast");    // you can avoid copying them like this
+				av_dict_set(&d, k, v, AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
 				/* Third parameter can be used to pass settings to encoder */
 				ret = avcodec_open2(enc_ctx, encoder, NULL);
 				if (ret < 0) {
@@ -292,13 +297,14 @@ int CAVTranscoder::open_output_file(const char *filename)
 		if (!pSrcFrame){
 			return 0;
 		}
+
 		for (int i = 0; i < pSrcFrame->height; i++)	{
-			memcpy(pDstFrame->data[0] + (y + i)*pDstFrame->linesize[0] + x, pSrcFrame->data[0] + i * pSrcFrame->linesize[0], pSrcFrame->linesize[0]);
+			memcpy(pDstFrame->data[0] + (y + i)*pDstFrame->linesize[0] + x, pSrcFrame->data[0] + i * pSrcFrame->linesize[0], pSrcFrame->linesize[0]>0 ? pSrcFrame->linesize[0] : -pSrcFrame->linesize[0]);
 		}
 
 		for (int i = 0; i < pSrcFrame->height / 2; i++){
-			memcpy(pDstFrame->data[1] + (y / 2)*pDstFrame->linesize[1] + x / 2, pSrcFrame->data[1] + i * pSrcFrame->linesize[1], pSrcFrame->linesize[1]);
-			memcpy(pDstFrame->data[2] + (y / 2)*pDstFrame->linesize[2] + x / 2, pSrcFrame->data[2] + i * pSrcFrame->linesize[2], pSrcFrame->linesize[2]);
+			memcpy(pDstFrame->data[1] + (y / 2 + i)*pDstFrame->linesize[1] + x / 2, pSrcFrame->data[1] + i * pSrcFrame->linesize[1], pSrcFrame->linesize[1]>0 ? pSrcFrame->linesize[1] : -pSrcFrame->linesize[1]);
+			memcpy(pDstFrame->data[2] + (y / 2 + i)*pDstFrame->linesize[2] + x / 2, pSrcFrame->data[2] + i * pSrcFrame->linesize[2], pSrcFrame->linesize[2]>0 ? pSrcFrame->linesize[2] : -pSrcFrame->linesize[2]);
 		}
 		return 0;
 	}
@@ -310,6 +316,8 @@ int CAVTranscoder::open_output_file(const char *filename)
 		int nDstSize = avpicture_get_size(AV_PIX_FMT_YUV420P,_nOutputWidth, _nOutputHeight);
 		uint8_t *dstbuf = new uint8_t[nDstSize];
 		avpicture_fill((AVPicture*)pDstFrame, dstbuf, AV_PIX_FMT_YUV420P, _nOutputWidth, _nOutputHeight);
+		memset(dstbuf, 0x80, nDstSize);
+
 		if (decoders_got_frame.size() == 2){
 			fillDestFrame(pDstFrame, decoders_got_frame[0]->_cur_v_frame, 0, decoders_got_frame[0]->_media_role == mr_teacher ? 0 : 240);
 			decoders_got_frame[0]->free_cur_v_frame();

@@ -20,6 +20,7 @@ int CVideoDecoder::add(media_info &info)
 		_uid = info.uid;
 	}
 	_info.push_back(info);
+	_rotate = info.rotate;
 
 	int ret;
 
@@ -300,7 +301,14 @@ int CVideoDecoder::filter_encode_write_frame(AVFrame *frame, unsigned int stream
 		}
 
 		filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
-		//todo: callback filted frame
+		if (_rotate == 180) {
+			filt_frame->data[0] += filt_frame->linesize[0] * (filt_frame->height - 1);
+			filt_frame->linesize[0] = -filt_frame->linesize[0];
+			filt_frame->data[1] += filt_frame->linesize[1] * (filt_frame->height / 2 - 1);
+			filt_frame->linesize[1] = -filt_frame->linesize[1];
+			filt_frame->data[2] += filt_frame->linesize[2] * (filt_frame->height / 2 - 1);
+			filt_frame->linesize[2] = -filt_frame->linesize[2];
+		}
 		_decoded_frames.push_back(filt_frame);
 	}
 

@@ -31,5 +31,6 @@ protected:
 	bool _is_finished;
 	AVRational _codec_timebase;
 	unsigned int _uid;
+	int _rotate;
 };
 

@@ -40,7 +40,7 @@
       <Filter>源文件</Filter>
     </ClCompile>
     <ClCompile Include="merge_pip.cpp">
-      <Filter>资源文件</Filter>
+      <Filter>源文件</Filter>
     </ClCompile>
   </ItemGroup>
   <ItemGroup>