Esempio n. 1
0
        /// <summary>
        /// Creates a new ACM stream to convert one format to another. Note that
        /// not all conversions can be done in one step
        /// </summary>
        /// <param name="sourceFormat">The source audio format</param>
        /// <param name="destFormat">The destination audio format</param>
        public AcmStream(WaveFormat sourceFormat, WaveFormat destFormat)
        {
            try
            {
                streamHandle      = IntPtr.Zero;
                this.sourceFormat = sourceFormat;
                int sourceBufferSize = Math.Max(65536, sourceFormat.AverageBytesPerSecond);
                sourceBufferSize -= (sourceBufferSize % sourceFormat.BlockAlign);
                IntPtr sourceFormatPointer = WaveFormat.MarshalToPtr(sourceFormat);
                IntPtr destFormatPointer   = WaveFormat.MarshalToPtr(destFormat);

                try
                {
                    MmException.Try(AcmInterop.acmStreamOpen2(out streamHandle, IntPtr.Zero, sourceFormatPointer, destFormatPointer, null, IntPtr.Zero, IntPtr.Zero, AcmStreamOpenFlags.NonRealTime), "acmStreamOpen");
                }
                finally
                {
                    Marshal.FreeHGlobal(sourceFormatPointer);
                    Marshal.FreeHGlobal(destFormatPointer);
                }

                int destBufferSize = SourceToDest(sourceBufferSize);
                streamHeader = new AcmStreamHeader(streamHandle, sourceBufferSize, destBufferSize);
                driverHandle = IntPtr.Zero;
            }
            catch
            {
                // suppress the finalise and clean up resources
                Dispose();
                throw;
            }
        }
Esempio n. 2
0
        /// <summary>
        /// Frees resources associated with this ACM Stream
        /// </summary>
        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                // Free other state (managed objects).
                if (streamHeader != null)
                {
                    streamHeader.Dispose();
                    streamHeader = null;
                }
            }

            // Free your own state (unmanaged objects).

            if (streamHandle != IntPtr.Zero)
            {
                MmResult result = AcmInterop.acmStreamClose(streamHandle, 0);
                streamHandle = IntPtr.Zero;
                if (result != MmResult.NoError)
                {
                    throw new MmException(result, "acmStreamClose");
                }
            }
            // Set large fields to null.
            if (driverHandle != IntPtr.Zero)
            {
                AcmInterop.acmDriverClose(driverHandle, 0);
                driverHandle = IntPtr.Zero;
            }
        }
Esempio n. 3
0
        /// <summary>
        /// Creates a new ACM stream to convert one format to another, using a
        /// specified driver identifier and wave filter
        /// </summary>
        /// <param name="driverId">the driver identifier</param>
        /// <param name="sourceFormat">the source format</param>
        /// <param name="waveFilter">the wave filter</param>
        public AcmStream(IntPtr driverId, WaveFormat sourceFormat, WaveFilter waveFilter)
        {
            int sourceBufferSize = Math.Max(16384, sourceFormat.AverageBytesPerSecond);

            this.sourceFormat = sourceFormat;
            sourceBufferSize -= (sourceBufferSize % sourceFormat.BlockAlign);
            MmException.Try(AcmInterop.acmDriverOpen(out driverHandle, driverId, 0), "acmDriverOpen");

            IntPtr sourceFormatPointer = WaveFormat.MarshalToPtr(sourceFormat);

            try
            {
                MmException.Try(AcmInterop.acmStreamOpen2(out streamHandle, driverHandle,
                                                          sourceFormatPointer, sourceFormatPointer, waveFilter, IntPtr.Zero, IntPtr.Zero, AcmStreamOpenFlags.NonRealTime), "acmStreamOpen");
            }
            finally
            {
                Marshal.FreeHGlobal(sourceFormatPointer);
            }
            streamHeader = new AcmStreamHeader(streamHandle, sourceBufferSize, SourceToDest(sourceBufferSize));
        }