AnimatGuiCtrls.Video.AudioStream.GetStreamData C# (CSharp) Метод

        public IntPtr GetStreamData(ref Avi.AVISTREAMINFO streamInfo, ref Avi.PCMWAVEFORMAT format, ref int streamLength)
        {
            streamInfo = GetStreamInfo();

            format = GetFormat();
            //length in bytes = length in samples * length of a sample
            streamLength = Avi.AVIStreamLength(aviStream.ToInt32()) * streamInfo.dwSampleSize;
            IntPtr waveData = Marshal.AllocHGlobal(streamLength);

            int result = Avi.AVIStreamRead(aviStream, 0, streamLength, waveData, streamLength, 0, 0);
            if(result != 0){
                throw new Exception("Exception in AVIStreamRead: "+result.ToString());
            }

            return waveData;
        }

        /// <summary>Copy a piece of video and wave sound int a new file</summary>
        /// <param name="newFileName">File name</param>
        /// <param name="startAtSecond">Start copying at second x</param>
        /// <param name="stopAtSecond">Stop copying at second y</param>
        /// <returns>AviManager for the new video</returns>
        public AviManager CopyTo(String newFileName, float startAtSecond, float stopAtSecond)
        {
            AviManager newFile = new AviManager(newFileName, false);

            try {
                //copy video stream

                VideoStream videoStream = GetVideoStream();

                int startFrameIndex = (int)(videoStream.FrameRate * startAtSecond);
                int stopFrameIndex  = (int)(videoStream.FrameRate * stopAtSecond);

                videoStream.GetFrameOpen();
                Bitmap      bmp       = videoStream.GetBitmap(startFrameIndex);
                VideoStream newStream = newFile.AddVideoStream(false, videoStream.FrameRate, bmp);
                for (int n = startFrameIndex + 1; n <= stopFrameIndex; n++)
                {
                    bmp = videoStream.GetBitmap(n);
                    newStream.AddFrame(bmp);
                }
                videoStream.GetFrameClose();

                //copy audio stream

                AudioStream waveStream = GetWaveStream();

                Avi.AVISTREAMINFO streamInfo   = new Avi.AVISTREAMINFO();
                Avi.PCMWAVEFORMAT streamFormat = new Avi.PCMWAVEFORMAT();
                int    streamLength            = 0;
                IntPtr ptrRawData = waveStream.GetStreamData(
                    ref streamInfo,
                    ref streamFormat,
                    ref streamLength);

                int startByteIndex = (int)(startAtSecond * (float)(waveStream.CountSamplesPerSecond * streamFormat.nChannels * waveStream.CountBitsPerSample) / 8);
                int stopByteIndex  = (int)(stopAtSecond * (float)(waveStream.CountSamplesPerSecond * streamFormat.nChannels * waveStream.CountBitsPerSample) / 8);

                IntPtr ptrWavePart = new IntPtr(ptrRawData.ToInt32() + startByteIndex);

                byte[] rawData = new byte[stopByteIndex - startByteIndex];
                Marshal.Copy(ptrWavePart, rawData, 0, rawData.Length);
                Marshal.FreeHGlobal(ptrRawData);

                streamInfo.dwLength = rawData.Length;
                streamInfo.dwStart  = 0;

                IntPtr unmanagedRawData = Marshal.AllocHGlobal(rawData.Length);
                Marshal.Copy(rawData, 0, unmanagedRawData, rawData.Length);
                newFile.AddAudioStream(unmanagedRawData, streamInfo, streamFormat, rawData.Length);
                Marshal.FreeHGlobal(unmanagedRawData);
            } catch (Exception ex) {
                newFile.Close();
                throw ex;
            }

            return(newFile);
        }