public void readANDwriteFrameTest()
{
//init handler to read sample file
YuvVideoInfo info_r = new YuvVideoInfo();
info_r.height = 144;
info_r.width = 176;
info_r.yuvFormat = YuvFormat.YUV420_IYUV;
YuvVideoHandler reader = new YuvVideoHandler();
reader.setVideo(TESTVIDEO_PATH, info_r);
//init handler to write a copy of sample file
YuvVideoInfo info_w = new YuvVideoInfo();
info_w.height = 144;
info_w.width = 176;
info_w.yuvFormat = YuvFormat.YUV420_IYUV;
YuvVideoHandler writer = new YuvVideoHandler();
writer.setVideo(TESTVIDEO_PATH + "copy", info_w);
//copy sample file frame by frame
//REMARK: This part can be commented out to save time once the copy is written to disk
// if this test is run several times to tweak parameters and error calculations
for (int j = 0; j < ((YuvVideoInfo)reader.vidInfo).frameCount; j++)
{
Bitmap bmp = reader.getFrame(j);
writer.writeFrame(j, bmp);
}
//
//compare original file with the copy read and written by the handler
//
//TODO: Debug writeFrame() & getFrame() as there are significant differences when a copy of a file is created through YuvVideoHandlers
//set buffersize to one frame
int bsize =(int)( info_r.width * info_r.height * (1 + YuvVideoHandler.getLum2Chrom(info_r.yuvFormat)) );
int error = 0;
int errorcount = 0;
FileStream fs1;
fs1 = new FileStream(TESTVIDEO_PATH, FileMode.Open);
byte[] data1 = new byte[bsize];
FileStream fs2;
fs2 = new FileStream(TESTVIDEO_PATH+"copy", FileMode.Open);
byte[] data2 = new byte[bsize];
//log files are written to the log folder with error information about frames and the whole file
//because an unfulfilled assertion cancels the whole testrun
StreamWriter log = new StreamWriter("C:/Dokumente und Einstellungen/Sebastian/Eigene Dateien/PSE/Implementierung/YuvVideoHandler/log/log.txt");
//compare original and copy bytewise
for (int i = 0; i < fs1.Length; i += bsize)
{
int r = fs1.Read(data1, 0, bsize);
int r2 = fs2.Read(data2, 0, bsize);
Assert.AreEqual(r, r2, "file read out of sync");
//init log writer for this frame
//the logfile of each frame contains the difference in value of original and copy for each byte
//the diffs are written in the textfile as a matrix according to pixel position
StreamWriter logdetail = new StreamWriter("C:/Dokumente und Einstellungen/Sebastian/Eigene Dateien/PSE/Implementierung/YuvVideoHandler/log/log"+(i/bsize)+".txt");
for (int j = 0; j < r; j++)
{
int diff = Math.Abs(data1[j] - data2[j]);
int y = j / info_r.width;
int x = j % info_r.width;
if (j % info_r.width == 0) logdetail.Write(logdetail.NewLine);
//Assert.IsTrue(diff < 5, "big difference at "+x+","+y+": "+diff);
logdetail.Write(diff+" ");
error += diff;
if (diff > 5) errorcount++;
}
logdetail.Close();
//the global logfile is written with the accumulated information about this frame
float errorratio = (((float)errorcount) / bsize);
log.WriteLine("Frame: "+(i/bsize)+" / errorratio: "+errorratio);
//Assert.IsTrue(error < 10, i+": error ratio: " + errorratio + " / error count: " + errorcount + " / accumulated error: " + error);
error = 0;
errorcount = 0;
}
log.Close();
fs1.Close();
fs2.Close();
Assert.Inconclusive("Compare logfiles to determine errorrates");
}
