public bool Init(int targetWidth, int targetHeight)
{
bool success = true;
m_targetWidth = targetWidth;
m_targetHeight = targetHeight;
if (m_mp4Reader != IntPtr.Zero)
{
Mp4.DestroyMp4Reader(m_mp4Reader);
m_mp4Reader = IntPtr.Zero;
}
m_mp4Reader = Mp4.CreateMp4Reader(m_mp4Filename);
if (m_mp4Reader != IntPtr.Zero)
{
// Get the video metadata from the file
if (!Mp4.GetVideoProperties(m_mp4Reader, out m_durationMilliseconds,
out m_frameRate, out m_width, out m_height, out m_sampleCount))
{
OnVideoCacheEvent(new VideoCache_EventArgs(VideoCache_Status_Type.ERROR, "Failed to get properties of this video file: " +
m_mp4Filename, null));
success = false;
}
}
else
{
success = false;
}
return(success);
}
async Task <long> PlayMp4FileAsync(string path, int targetWidth, int targetHeight, double startTimestamp, double endTimestamp,
DNNTools.DNNengine dnnEngine, float confidence, bool useTracker,
IProgress <ProgressStruct> progress,
CancellationToken token, WPFTools.PauseToken pauseToken,
bool paceOutput, Dictionary <double, int> frameIndexLookup)
{
// path - filename/path to Mp4 file
// startingAt - point in time to start decoding/playback, given in milliseconds
// targetWidth, targetHeight - desired pixel dimension of decoded frames
// paceOutput - flag indicating whether to pace the output, using frame
// timestamps and framerate, so that playback is at video rate
long count = -1;
if (File.Exists(path))
{
count = await Task.Run <long>(async() =>
{
double timestamp = 0.0f;
Stopwatch sw = new Stopwatch();
IntPtr mp4Reader = IntPtr.Zero;
try
{
mp4Reader = Mp4.CreateMp4Reader(path);
}
catch (Exception ex)
{
string message = ex.Message;
}
DNNTools.NonMaximumSuppression nms = new DNNTools.NonMaximumSuppression();
nms.Init();
DNNTools.MultiTracker multiTracker = new DNNTools.MultiTracker();
if (mp4Reader != IntPtr.Zero)
{
try
{
long durationMilliseconds;
double frameRate;
long timestampDelta;
long timestampWindow;
int height;
int width;
int sampleCount;
// Get the video metadata from the file
if (Mp4.GetVideoProperties(mp4Reader, out durationMilliseconds, out frameRate, out width, out height, out sampleCount))
{
timestampDelta = (long)(1000.0f / frameRate);
timestampWindow = timestampDelta / 2;
// Ask the decoder to resample to targetWidth x targetHeight, and assume 24-bit RGB colorspace
byte[] frame = new byte[targetWidth *targetHeight * 3];
bool key;
ProgressStruct prog;
m_frameCount = 0;
// move to starting position
double actualStart = Mp4.SetTimePositionAbsolute(mp4Reader, startTimestamp);
int frameIndex = 0;
// get the starting frame index
int tempIndex = 0;
if (frameIndexLookup != null)
{
if (frameIndexLookup.TryGetValue(actualStart, out tempIndex))
{
frameIndex = tempIndex;
}
}
// create flag used to quit early
bool running = true;
if (actualStart == -1) // failed to move to start position
{
running = false;
}
sw.Start();
while (running)
{
timestamp = (double)Mp4.GetNextVideoFrame(mp4Reader, frame, out key, targetWidth, targetHeight) / 1000.0;
if (timestamp == -0.001) // EOF
{
running = false;
break;
}
if (token.IsCancellationRequested)
{
// pause or stop requested
running = false;
break;
}
byte[] frameCopy = new byte[targetWidth *targetHeight * 3];
Buffer.BlockCopy(frame, 0, frameCopy, 0, targetWidth *targetHeight * 3);
prog = new ProgressStruct(timestamp, durationMilliseconds, frameCopy, frameIndex, key, !running, targetWidth, targetHeight);
if (dnnEngine != null)
{
prog.boxList = dnnEngine.EvalImage(frameCopy, targetWidth, targetHeight, 3, targetWidth, targetHeight, confidence);
prog.boxList = nms.Execute(prog.boxList, 0.50f);
if (useTracker)
{
List <DNNTools.BoundingBox> trackedBoxes = multiTracker.Update(frameCopy, targetWidth, targetHeight, prog.boxList);
prog.boxList.AddRange(trackedBoxes);
prog.boxList = nms.Execute(prog.boxList, 0.50f);
}
else
{
multiTracker.ClearTrackers();
}
}
if (progress != null && prog.data != null)
{
// if we're in playback mode, pace the frames appropriately
if (paceOutput)
{
while (sw.ElapsedMilliseconds < timestampDelta)
{
Thread.Sleep(1);
}
sw.Restart();
}
m_frameCount++;
// send frame to UI thread
progress.Report(prog);
}
await pauseToken.WaitWhilePausedAsync();
if (timestamp >= endTimestamp)
{
break;
}
frameIndex++;
}
}
}
catch (Exception ex)
{
m_errorMsg = ex.Message;
timestamp = -2; // indicating an exception occurred
}
finally
{
try
{
Mp4.DestroyMp4Reader(mp4Reader);
}
catch (Exception ex)
{
string message = ex.Message;
}
progress.Report(new ProgressStruct(-0.001, 0, null, m_frameCount, false, true, 0, 0)); // signal that the player stopped (timestamp = -0.001)
}
}
else
{
timestamp = -3;
m_errorMsg = "Could not open file.";
}
return((long)timestamp);
}, token);
} // END File.Exists
return(count);
}
