AudioFileOut.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Speech / Src / Internal / Synthesis / AudioFileOut.cs / 1 / AudioFileOut.cs
                        
                        
                            //------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
//  This class defines the header used to identify a waveform-audio
//  buffer. 
// 
// History:
//		2/1/2005	[....]		Created from the Sapi Managed code 
//-----------------------------------------------------------------

using System;
using System.IO; 
using System.Speech.AudioFormat;
using System.Threading; 
using System.Diagnostics; 

namespace System.Speech.Internal.Synthesis 
{
    /// 
    /// Encapsulates Waveform Audio Interface playback functions and provides a simple
    /// interface for playing audio. 
    /// 
    internal class AudioFileOut : AudioBase, IDisposable 
    { 
        //*******************************************************************
        // 
        // Constructors
        //
        //*******************************************************************
 
        #region Constructors
 
        ///  
        /// Create an instance of AudioFileOut.
        ///  
        internal AudioFileOut (Stream stream, SpeechAudioFormatInfo formatInfo, bool headerInfo, IAsyncDispatch asyncDispatch)
        {
            _asyncDispatch = asyncDispatch;
            _stream = stream; 
            _startStreamPosition = _stream.Position;
            _hasHeader = headerInfo; 
 
            _wfxOut = new WAVEFORMATEX ();
            // if we have a formatInfo object, format conversion may be necessary 
            if (formatInfo != null)
            {
                // Build the Wave format from the formatInfo
                _wfxOut.wFormatTag = (short) formatInfo.EncodingFormat; 
                _wfxOut.wBitsPerSample = (short) formatInfo.BitsPerSample;
                _wfxOut.nSamplesPerSec = formatInfo.SamplesPerSecond; 
                _wfxOut.nChannels = (short) formatInfo.ChannelCount; 
            }
            else 
            {
                // Set the default values
                _wfxOut = WAVEFORMATEX.Default;
            } 
            _wfxOut.nBlockAlign = (short) (_wfxOut.nChannels * _wfxOut.wBitsPerSample / 8);
            _wfxOut.nAvgBytesPerSec = _wfxOut.wBitsPerSample * _wfxOut.nSamplesPerSec * _wfxOut.nChannels / 8; 
        } 

        public void Dispose () 
        {
            _evt.Close ();
        }
 
        #endregion
 
        //******************************************************************** 
        //
        // Internal Methods 
        //
        //*******************************************************************

        #region Internal Methods 

        ///  
        /// Begin to play 
        /// 
        ///  
        override internal void Begin (byte [] wfx)
        {
            if (_deviceOpen)
            { 
                System.Diagnostics.Debug.Assert (false);
                throw new InvalidOperationException (); 
            } 

            // Get the audio format if conversion is needed 
            _wfxIn = WAVEFORMATEX.ToWaveHeader (wfx);
            _doConversion = _pcmConverter.PrepareConverter (ref _wfxIn, ref _wfxOut);

            if (_totalByteWrittens == 0 && _hasHeader) 
            {
                WriteWaveHeader (_stream, _wfxOut, _startStreamPosition, 0); 
            } 

            _bytesWritten = 0; 

            // set the flags
            _aborted = false;
            _deviceOpen = true; 
        }
 
        ///  
        /// Begin to play
        ///  
        override internal void End ()
        {
            if (!_deviceOpen)
            { 
                System.Diagnostics.Debug.Assert (false);
                throw new InvalidOperationException (); 
            } 
            _deviceOpen = false;
 
            if (!_aborted)
            {
                if (_hasHeader)
                { 
                    long position = _stream.Position;
                    WriteWaveHeader (_stream, _wfxOut, _startStreamPosition, _totalByteWrittens); 
                    _stream.Seek (position, SeekOrigin.Begin); 
                }
            } 
        }

        #region AudioDevice implementation
 
        /// 
        /// Play a wave file. 
        ///  
        /// 
        override internal void Play (byte [] buffer) 
        {
            if (!_deviceOpen)
            {
                System.Diagnostics.Debug.Assert (false); 
            }
            else 
            { 
                byte [] abOut = _doConversion ? _pcmConverter.ConvertSamples (buffer) : buffer;
 
                if (_paused)
                {
                    _evt.WaitOne ();
                    _evt.Reset (); 
                }
                if (!_aborted) 
                { 
                    _stream.Write (abOut, 0, abOut.Length);
                    _totalByteWrittens += abOut.Length; 
                    _bytesWritten += abOut.Length;
                }
            }
        } 

        ///  
        /// Pause the playback of a sound. 
        /// 
        /// MMSYSERR.NOERROR if successful 
        override internal void Pause ()
        {
            if (!_aborted && !_paused)
            { 
                lock (_noWriteOutLock)
                { 
                    _paused = true; 
                }
            } 
        }

        /// 
        /// Resume the playback of a paused sound. 
        /// 
        /// MMSYSERR.NOERROR if successful 
        override internal void Resume () 
        {
            if (!_aborted && _paused) 
            {
                lock (_noWriteOutLock)
                {
                    _paused = false; 
                    _evt.Set ();
                } 
            } 
        }
 
        /// 
        /// Wait for all the queued buffers to be played
        /// 
        override internal void Abort () 
        {
            lock (_noWriteOutLock) 
            { 
                _aborted = true;
                _paused = false; 
                _evt.Set ();
            }
        }
 

        override internal void InjectEvent (TTSEvent ttsEvent) 
        { 
            if (!_aborted && _asyncDispatch != null)
            { 
                _asyncDispatch.Post (ttsEvent);
            }
        }
 
        /// 
        /// File operation are basically synchonous 
        ///  
        override internal void WaitUntilDone ()
        { 
            lock (_noWriteOutLock)
            {
            }
        } 

        #endregion 
 
        #endregion
 
        //********************************************************************
        //
        // Internal Fields
        // 
        //********************************************************************
 
        #region Internal Fields 

        override internal TimeSpan Duration 
        {
            get
            {
                if (_wfxIn.nAvgBytesPerSec == 0) 
                {
                    return new TimeSpan (0); 
                } 
                return new TimeSpan ((_bytesWritten * TimeSpan.TicksPerSecond) / _wfxIn.nAvgBytesPerSec);
            } 
        }

        override internal long Position
        { 
            get
            { 
                return _stream.Position; 
            }
        } 

        internal override byte [] WaveFormat
        {
            get 
            {
                return _wfxOut.ToBytes (); 
            } 
        }
 
        #endregion

        //*******************************************************************
        // 
        // Protected Fields
        // 
        //******************************************************************** 

        #region Private Fields 

        protected ManualResetEvent _evt = new ManualResetEvent (false);
        protected bool _deviceOpen;
 
        protected Stream _stream;
 
        protected PcmConverter _pcmConverter = new PcmConverter (); 
        protected bool _doConversion;
 
        protected bool _paused;
        protected int _totalByteWrittens;
        protected int _bytesWritten;
 
        #endregion
 
        //******************************************************************* 
        //
        // Private Fields 
        //
        //*******************************************************************

        #region Private Fields 

        private IAsyncDispatch _asyncDispatch; 
        private object _noWriteOutLock = new object (); 

        private WAVEFORMATEX _wfxIn; 
        private WAVEFORMATEX _wfxOut;
        private bool _hasHeader;

        private long _startStreamPosition; 

        #endregion 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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AudioFileOut.cs source code in C# .NET

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