AnimatGuiCtrls.Video.AviManager.InsertSilence C# (CSharp) Method

        private IntPtr InsertSilence(int countSilentSamples, IntPtr waveData, int lengthWave, ref Avi.AVISTREAMINFO streamInfo)
        {
            //initialize silence
            int lengthSilence = countSilentSamples * streamInfo.dwSampleSize;
            byte[] silence = new byte[lengthSilence];

            //initialize new sound
            int lengthNewStream = lengthSilence + lengthWave;
            IntPtr newWaveData = Marshal.AllocHGlobal(lengthNewStream);

            //copy silence
            Marshal.Copy(silence, 0, newWaveData, lengthSilence);

            //copy sound
            byte[] sound = new byte[lengthWave];
            Marshal.Copy(waveData, sound, 0, lengthWave);
            IntPtr startOfSound = new IntPtr(newWaveData.ToInt32() + lengthSilence);
            Marshal.Copy(sound, 0, startOfSound, lengthWave);

            Marshal.FreeHGlobal(newWaveData);

            streamInfo.dwLength = lengthNewStream;
            return newWaveData;
        }