C# (CSharp) Accord.Video.VFW AVIReader.GetNextFrame примеры использования

GetNextFrame() публичный Метод

Get next frame of opened video stream.

The method reads and returns the next video frame in the opened video stream at the position, which is set in Position property.

Thrown if no video file was open. A error occurred while reading next video frame. See exception message.

public GetNextFrame ( ) : Bitmap
Результат	System.Drawing.Bitmap

Пример #1

Файл: AVIFileVideoSource.cs Проект: accord-net/framework

        /// <summary>
        /// Worker thread.
        /// </summary>
        /// 
        private void WorkerThread( )
		{
            ReasonToFinishPlaying reasonToStop = ReasonToFinishPlaying.StoppedByUser;
            // AVI reader
			AVIReader aviReader = new AVIReader( );

			try
			{
				// open file
				aviReader.Open( source );

                // stop positions
                int stopPosition = aviReader.Start + aviReader.Length;

                // frame interval
                int interval = ( frameIntervalFromSource ) ? (int) ( 1000 / aviReader.FrameRate ) : frameInterval;

                while ( !stopEvent.WaitOne( 0, false ) )
				{
					// start time
					DateTime start = DateTime.Now;

					// get next frame
					Bitmap bitmap = aviReader.GetNextFrame( );

					framesReceived++;
                    bytesReceived += bitmap.Width * bitmap.Height *
                        ( Bitmap.GetPixelFormatSize( bitmap.PixelFormat ) >> 3 );

					if ( NewFrame != null )
						NewFrame( this, new NewFrameEventArgs( bitmap ) );

					// free image
					bitmap.Dispose( );

                    // check current position
                    if ( aviReader.Position >= stopPosition )
                    {
                        reasonToStop = ReasonToFinishPlaying.EndOfStreamReached;
                        break;
                    }

                    // wait for a while ?
                    if ( interval > 0 )
                    {
                        // get frame extract duration
                        TimeSpan span = DateTime.Now.Subtract( start );

                        // miliseconds to sleep
                        int msec = interval - (int) span.TotalMilliseconds;

                        if ( ( msec > 0 ) && ( stopEvent.WaitOne( msec, false ) ) )
                            break;
                    }
				}
			}
			catch ( Exception exception )
			{
                // provide information to clients
                if ( VideoSourceError != null )
                {
                    VideoSourceError( this, new VideoSourceErrorEventArgs( exception.Message ) );
                }
			}

			aviReader.Dispose( );
			aviReader = null;

            if ( PlayingFinished != null )
            {
                PlayingFinished( this, reasonToStop );
            } 
		}

Пример #2

Файл: AVIFileVideoSource.cs Проект: sishui198/Accord.NET

        /// <summary>
        /// Worker thread.
        /// </summary>
        ///
        private void WorkerThread( )
        {
            ReasonToFinishPlaying reasonToStop = ReasonToFinishPlaying.StoppedByUser;
            // AVI reader
            AVIReader aviReader = new AVIReader( );

            try
            {
                // open file
                aviReader.Open(source);

                // stop positions
                int stopPosition = aviReader.Start + aviReader.Length;

                // frame interval
                int interval = (frameIntervalFromSource) ? (int)(1000 / aviReader.FrameRate) : frameInterval;

                while (!stopEvent.WaitOne(0, false))
                {
                    // start time
                    DateTime start = DateTime.Now;

                    // get next frame
                    Bitmap bitmap = aviReader.GetNextFrame( );

                    framesReceived++;
                    bytesReceived += bitmap.Width * bitmap.Height *
                                     (Bitmap.GetPixelFormatSize(bitmap.PixelFormat) >> 3);

                    if (NewFrame != null)
                    {
                        NewFrame(this, new NewFrameEventArgs(bitmap));
                    }

                    // free image
                    bitmap.Dispose( );

                    // check current position
                    if (aviReader.Position >= stopPosition)
                    {
                        reasonToStop = ReasonToFinishPlaying.EndOfStreamReached;
                        break;
                    }

                    // wait for a while ?
                    if (interval > 0)
                    {
                        // get frame extract duration
                        TimeSpan span = DateTime.Now.Subtract(start);

                        // miliseconds to sleep
                        int msec = interval - (int)span.TotalMilliseconds;

                        if ((msec > 0) && (stopEvent.WaitOne(msec, false)))
                        {
                            break;
                        }
                    }
                }
            }
            catch (Exception exception)
            {
                // provide information to clients
                if (VideoSourceError != null)
                {
                    VideoSourceError(this, new VideoSourceErrorEventArgs(exception.Message));
                }
            }

            aviReader.Dispose( );
            aviReader = null;

            if (PlayingFinished != null)
            {
                PlayingFinished(this, reasonToStop);
            }
        }