1.keep still image in one2one mode

2.flip image when retote 180
3.save record info as m_*
4.use stream time base when decode,don't use decode codec time base,because it is varied in some mp4 file

@@ -8,8 +8,8 @@ extern "C" {
 #pragma comment(lib,"swscale.lib")
 #endif
 
-#define SCALED_W 80
-#define SCALED_H 60
+#define SCALED_W 100
+#define SCALED_H 75
 #define SRC_W 320
 #define SRC_H 240
 uint8_t blank_r = 0x16;
@@ -25,7 +25,9 @@ _cur_out_a_ts(0),
 _max_audio(1),
 _swsCtx(NULL),
 _scaledFrame(NULL),
-_last_videos_got(-1)
+_last_videos_got(-1),
+_teacherFrame(NULL),
+_studentFrame(NULL)
 {
 	_one2one = bOne2One;
 	if (_one2one) {
@@ -54,6 +56,8 @@ _last_videos_got(-1)
 
 CAVTranscoder::~CAVTranscoder()
 {
+	av_frame_free(&_teacherFrame);
+	av_frame_free(&_studentFrame);
 }
 
 int CAVTranscoder::add(media_info & info)
@@ -369,7 +373,7 @@ int CAVTranscoder::open_output_file(const char *filename)
 				}
 				
 				//copy each frame to the dest frame
-				fillDestFrame(pDstFrame, _scaledFrame, SRC_W - SCALED_H - 10 - (imageIdx % 4) * (SCALED_H + 10), SRC_H - SCALED_H - (SCALED_H + 8)*(imageIdx / 4), (SCALED_W - SCALED_H) / 2, 0, SCALED_H, SCALED_H);
+				fillDestFrame(pDstFrame, _scaledFrame, SRC_W - 3 - (imageIdx % 4) * (SCALED_H + 5), SRC_H - SCALED_H - (SCALED_H + 2)*(imageIdx / 4), (SCALED_W - SCALED_H) / 2, 0, SCALED_H-1, SCALED_H-1);
 				imageIdx++;
 			}
 		}
@@ -396,14 +400,45 @@ 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]>0 ? pSrcFrame->linesize[0] : -pSrcFrame->linesize[0]);
+		if (pSrcFrame->pkt_dts == 180) {
+			unsigned char * startSrcY = pSrcFrame->data[0] + (pSrcFrame->height) * pSrcFrame->linesize[0] - 1;
+			for (int i = 0; i < pSrcFrame->height; i++)	{
+				//memcpy(pDstFrame->data[0] + (y + i)*pDstFrame->linesize[0] + x, startSrcY -  i * pSrcFrame->linesize[0], pSrcFrame->linesize[0]);
+				unsigned char * psrc = startSrcY - i * pSrcFrame->linesize[0];
+				unsigned char * pdst = pDstFrame->data[0] + (y + i)*pDstFrame->linesize[0] + x;
+				unsigned char * pdst_end = pdst + pSrcFrame->linesize[0];
+				for (; pdst < pdst_end; psrc--, pdst++) {
+					*pdst = *psrc;
+				}
+			}
+			unsigned char * startSrcU = pSrcFrame->data[1] + (pSrcFrame->height/2 ) * pSrcFrame->linesize[1] -1;
+			unsigned char * startSrcV = pSrcFrame->data[2] + (pSrcFrame->height/2) * pSrcFrame->linesize[2] -1;
+			for (int i = 0; i < pSrcFrame->height / 2; i++){
+				//memcpy(pDstFrame->data[1] + (y / 2 + i)*pDstFrame->linesize[1] + x / 2, startSrcU - i * pSrcFrame->linesize[1], pSrcFrame->linesize[1]);
+				//memcpy(pDstFrame->data[2] + (y / 2 + i)*pDstFrame->linesize[2] + x / 2, startSrcV - i * pSrcFrame->linesize[2], pSrcFrame->linesize[2]);
+				unsigned char * psrc = startSrcU - i * pSrcFrame->linesize[1];
+				unsigned char * pdst = pDstFrame->data[1] + (y/2 + i)*pDstFrame->linesize[1] + x/2;
+				unsigned char * pdst_end = pdst + pSrcFrame->linesize[1];
+				for (; pdst < pdst_end; psrc--, pdst++) {
+					*pdst = *psrc;
+				}
+				psrc = startSrcV - i * pSrcFrame->linesize[2];
+				pdst = pDstFrame->data[2] + (y / 2 + i)*pDstFrame->linesize[2] + x / 2;
+				pdst_end = pdst + pSrcFrame->linesize[2];
+				for (; pdst < pdst_end; psrc--, pdst++) {
+					*pdst = *psrc;
+				}
+			}
 		}
+		else {
+			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] > 0 ? pSrcFrame->linesize[0] : -pSrcFrame->linesize[0]);
+			}
 
-		for (int i = 0; i < pSrcFrame->height / 2; i++){
-			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]);
+			for (int i = 0; i < pSrcFrame->height / 2; i++){
+				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;
 	}
@@ -429,18 +464,46 @@ int CAVTranscoder::open_output_file(const char *filename)
 		uint8_t *dstbuf = new uint8_t[nDstSize];
 		avpicture_fill((AVPicture*)pDstFrame, dstbuf, AV_PIX_FMT_YUV420P, _nOutputWidth, _nOutputHeight);
 
-		memset(pDstFrame->data[0], _blank_y, _nOutputWidth * _nOutputHeight);
-		memset(pDstFrame->data[1], _blank_u, _nOutputWidth *_nOutputHeight / 4);
-		memset(pDstFrame->data[2], _blank_v, _nOutputWidth * _nOutputHeight / 4);
+		for (unsigned int i = 0; i < decoders_got_frame.size(); i++) {
+			if (decoders_got_frame[i]->_media_role == mr_teacher) {
+				AVFrame * pFrame = decoders_got_frame[i]->_cur_v_frame;
+				if (pFrame) {
+					av_frame_free(&_teacherFrame);
+					_teacherFrame = pFrame;
+					decoders_got_frame[i]->_cur_v_frame = NULL;
+				}
+			}
+			else {
+				AVFrame * pFrame = decoders_got_frame[i]->_cur_v_frame;
+				if (pFrame) {
+					av_frame_free(&_studentFrame);
+					_studentFrame = pFrame;
+					decoders_got_frame[i]->_cur_v_frame = NULL;
+				}
+			}
+		}
+
+		if (!_teacherFrame && !_studentFrame) {
+			memset(pDstFrame->data[0], _blank_y, _nOutputWidth * _nOutputHeight);
+			memset(pDstFrame->data[1], _blank_u, _nOutputWidth * _nOutputHeight / 4);
+			memset(pDstFrame->data[2], _blank_v, _nOutputWidth * _nOutputHeight / 4);
+		}
+
+		if (_teacherFrame) {
+			fillDestFrame(pDstFrame, _teacherFrame, 0, 0);
+			if (_studentFrame) {
+				fillDestFrame(pDstFrame, _studentFrame, 0, 240);
+			}
+		}
+		else if (_studentFrame) {
+			fillDestFrame(pDstFrame, _studentFrame, 0, 0);
+		}
 
 		if (decoders_got_frame.size() == 2){
 			if (_last_videos_got != 2) {
 				_last_videos_got = 2;
 				printf("\n--get 2 video:%"PRIu64", %s, %s\n", _cur_out_v_ts, decoders_got_frame[0]->get_cur_vfile().c_str(), decoders_got_frame[1]->get_cur_vfile().c_str());
 			}
-			fillDestFrame(pDstFrame, decoders_got_frame[0]->_cur_v_frame, 0, decoders_got_frame[0]->_media_role == mr_teacher ? 0 : 240);
-
-			fillDestFrame(pDstFrame, decoders_got_frame[1]->_cur_v_frame, 0, decoders_got_frame[1]->_media_role == mr_teacher ? 0 : 240);
 		}
 		else if (decoders_got_frame.size() == 1)
 		{
@@ -448,15 +511,12 @@ int CAVTranscoder::open_output_file(const char *filename)
 				_last_videos_got = 1;
 				printf("\n--get 1 video:%"PRIu64", %s\n", _cur_out_v_ts, decoders_got_frame[0]->get_cur_vfile().c_str());
 			}
-			fillDestFrame(pDstFrame, decoders_got_frame[0]->_cur_v_frame, 0, 0);
-			//todo: fill the bottom half image with pure color
 		}
 		else {
 			if (_last_videos_got != 0) {
 				_last_videos_got = 0;
 				printf("\n--get 0 video:%"PRIu64"\n", _cur_out_v_ts);
 			}
-			//fill with last image?
 		}
 #if 0
 		if (_cur_out_v_ts > (26 * 60 + 57) *(1000 /50)) {

@@ -44,6 +44,8 @@ private:
 	struct SwsContext * _swsCtx;
 	AVFrame * _scaledFrame;
 	int _last_videos_got;
+	AVFrame * _teacherFrame;
+	AVFrame * _studentFrame; // for one2one,keep the last frame
 
 	uint8_t _blank_y, _blank_u, _blank_v;
 public:

@@ -267,6 +267,7 @@ int CVideoDecoder::open_input_file(const char *filename)
 				av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
 				return ret;
 			}
+			codec_ctx->time_base = stream->time_base;
 		}
 	}
 
@@ -312,12 +313,10 @@ int CVideoDecoder::filter_encode_write_frame(AVFrame *frame, unsigned int stream
 
 		filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
 		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];
+			filt_frame->pkt_dts = 180;//use this to indicate rotate 180
+		}
+		else {
+			filt_frame->pkt_dts = 0;
 		}
 		_decoded_frames.push_back(filt_frame);
 	}
@@ -372,9 +371,9 @@ int CVideoDecoder::get_one_frame(AVFrame ** pFrame, int64_t & ts)
 				break;
 			}
 
-			av_packet_rescale_ts(&packet,
+	/*		av_packet_rescale_ts(&packet,
 				ifmt_ctx->streams[stream_index]->time_base,
-				ifmt_ctx->streams[stream_index]->codec->time_base);
+				ifmt_ctx->streams[stream_index]->codec->time_base);*/
 			dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 :
 				avcodec_decode_audio4;
 			ret = dec_func(ifmt_ctx->streams[stream_index]->codec, frame,

@@ -652,20 +652,22 @@ void add_media_infos()
 	printf("\n-------------------------\n");
 
 	it = audio_type_files.begin();
-	media_info last = *it;
-
-	for (it++; it != audio_type_files.end(); it++) {
-		if (it->t_type == tt_end) {
-			if (last.t_type == tt_start) {
-				float mid = (it->type_time + last.type_time) / 2;
-				int files_with_mid = count_audio_files(mid);
-				if (files_with_mid > max_audio) {
-					max_audio = files_with_mid;
+	if (it != audio_type_files.end()) {
+		media_info last = *it;
+
+		for (it++; it != audio_type_files.end(); it++) {
+			if (it->t_type == tt_end) {
+				if (last.t_type == tt_start) {
+					float mid = (it->type_time + last.type_time) / 2;
+					int files_with_mid = count_audio_files(mid);
+					if (files_with_mid > max_audio) {
+						max_audio = files_with_mid;
+					}
 				}
 			}
-		}
-		else {
-			last = *it;
+			else {
+				last = *it;
+			}
 		}
 	}
 }
@@ -890,23 +892,30 @@ void load_codec_param()
 
 void get_outinfo_file_name(char * input)
 {
+#if 0
 	strcpy(out_info_file, input);
 	char * p = strstr(out_info_file, ".");
 	if (p) {
 		*p = 0;
 	}
 	strcat(out_info_file, "_out.txt");
+#else
+	strcpy(out_info_file, "m_");
+	strcat(out_info_file, input);
+#endif
 }
 
 string get_outmedia_file_name(const char * input)
 {
 	char out_media_file[1024];
-	strcpy(out_media_file, input);
+	strcpy(out_media_file, "m_");
+
+	strcat(out_media_file, input);
 	char * p = strstr(out_media_file, ".");
 	if (p) {
 		*p = 0;
 	}
-	strcat(out_media_file, "_out.mp4");
+	strcat(out_media_file, ".mp4");
 	return out_media_file;
 }