wavdecoder.h

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

    The Mezzanine Engine is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    The Mezzanine Engine is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with The Mezzanine Engine.  If not, see <http://www.gnu.org/licenses/>.
*/
/* The original authors have included a copy of the license specified above in the
   'Docs' folder. See 'gpl.txt'
*/
/* We welcome the use of the Mezzanine engine to anyone, including companies who wish to
   Build professional software and charge for their product.

   However there are some practical restrictions, so if your project involves
   any of the following you should contact us and we will try to work something
   out:
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    - If You want to change our code and not add a few hundred MB of stuff to
        your distribution

   These and other limitations could cause serious legal problems if you ignore
   them, so it is best to simply contact us or the Free Software Foundation, if
   you have any questions.

   Joseph Toppi - toppij@gmail.com
   John Blackwood - makoenergy02@gmail.com
*/
// Copyright (c) 2008-2010 Raynaldo (Wildicv) Rivera, Joshua (Dark_Kilauea) Jones
// This file is part of the "cAudio Engine"
// For conditions of distribution and use, see copyright notice in cAudio-ZLIBLicense.txt
#ifndef _audiowavdecoder_h
#define _audiowavdecoder_h

#ifdef ENABLE_WAV_ENCODE

#include "Audio/decoder.h"

namespace Mezzanine
{
    namespace Audio
    {
        ///////////////////////////////////////////////////////////////////////////////
        /// @brief This is a @ref iDecoder implementation for the wav encoding.
        /// @details
        ///////////////////////////////////////
        class MEZZ_LIB WavDecoder : public iDecoder
        {
        protected:
            /// @internal
            /// @brief This is a shared pointer to the stream being decoded.
            Resource::DataStreamPtr WavStream;
            /// @internal
            /// @brief This is used to cache the total size of the stream used by this decoder.
            Integer WavStreamSize;
            /// @internal
            /// @brief This is used to cache the current stream position for this decoder.
            Integer WavStreamPos;
            /// @internal
            /// @brief The frequency of the wav file.
            Int32 SampleRate;
            /// @internal
            /// @brief Redundant wav data expressing the rate of platback for the wav file.
            Int32 ByteRate;
            /// @internal
            /// @brief The end point of the audio in the wav file.
            Int32 DataSize;
            /// @internal
            /// @brief The start point of the audio in the wav file.
            Int32 DataOffset;
            /// @internal
            /// @brief The number of channels in this wav file.
            UInt16 Channels;
            /// @internal
            /// @brief The byte alignment of the waveform data in this wav file.
            UInt16 BlockAlign;
            /// @internal
            /// @brief The size of each sample in this wav file.
            UInt16 BitsPerSample;
            /// @internal
            /// @brief Tracks and stores the validity of the Wav stream.
            Boole Valid;

            /// @copydoc iDecoder::ClearStreamErrors()
            void ClearStreamErrors();
            /// @internal
            /// @brief Reads the metadata at the start of a Wav stream and saves it.
            /// @param Stream The Wav stream to read metadata from.
            void ReadWavMetaData(Resource::DataStreamPtr Stream);
        public:
            /// @brief Class constructor.
            /// @param Stream The stream to decode.
            WavDecoder(Resource::DataStreamPtr Stream);
            /// @brief Class destructor.
            virtual ~WavDecoder();

            ///////////////////////////////////////////////////////////////////////////////
            // Utility

            /// @copydoc iDecoder::IsValid()
            Boole IsValid();
            /// @copydoc iDecoder::GetEncoding() const
            Audio::Encoding GetEncoding() const;
            /// @copydoc iDecoder::IsSeekingSupported()
            Boole IsSeekingSupported();
            /// @copydoc iDecoder::GetBitConfiguration() const
            Audio::BitConfig GetBitConfiguration() const;
            /// @copydoc iDecoder::GetFrequency() const
            UInt32 GetFrequency() const;
            /// @copydoc iDecoder::GetStream() const
            Resource::DataStreamPtr GetStream() const;
            /// @copydoc iDecoder::IsEndOfStream() const
            Boole IsEndOfStream() const;

            /// @copydoc iDecoder::SetPosition(Int32, const Boole)
            Boole SetPosition(Int32 Position, const Boole Relative);
            /// @copydoc iDecoder::Seek(const Real, const Boole)
            Boole Seek(const Real Seconds, const Boole Relative);

            /// @copydoc iDecoder::ReadAudioData(void*, UInt32)
            UInt32 ReadAudioData(void* Output, UInt32 Amount);

            ///////////////////////////////////////////////////////////////////////////////
            // Stream Stats

            /// @copydoc iDecoder::GetTotalTime() const
            Real GetTotalTime() const;
            /// @copydoc iDecoder::GetCurrentTime() const
            Real GetCurrentTime() const;
            /// @copydoc iDecoder::GetTotalSize() const
            UInt32 GetTotalSize() const;
            /// @copydoc iDecoder::GetCompressedSize() const
            UInt32 GetCompressedSize() const;
            /// @copydoc iDecoder::GetCurrentPosition() const
            UInt32 GetCurrentPosition() const;
            /// @copydoc iDecoder::GetCurrentCompressedPosition() const
            UInt32 GetCurrentCompressedPosition() const;
        };//WavDecoder
    }//Audio
}//Mezzanine

#endif //ENABLE_WAV_ENCODE

#endif