/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library 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

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public

    License along with this library; if not, write to the Free

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga

    slouken@libsdl.org

    This file based on Apple sample code. We haven't changed the file name, 

    so if you want to see the original search for it on apple.com/developer

*/

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

//  AudioFilePlayer.h

//

#ifndef __AudioFilePlayer_H__

#define __AudioFilePlayer_H__

#include <CoreServices/CoreServices.h>

#include <AudioToolbox/AudioToolbox.h>

#include <AudioUnit/AudioUnit.h>

const char* AudioFilePlayerErrorStr (OSStatus error);

void ThrowResult (OSStatus result, const char *str);

#define THROW_RESULT(str)                                       \

    if (result) {                                               \

        ThrowResult (result, str);                              \

    }

typedef void (*AudioFilePlayNotifier)(void          *inRefCon,

                                    OSStatus        inStatus);

enum {

    kAudioFilePlayErr_FilePlayUnderrun = -10000,

    kAudioFilePlay_FileIsFinished = -10001,

    kAudioFilePlay_PlayerIsUninitialized = -10002

};

class AudioFileManager;

#pragma mark __________ AudioFilePlayer

class AudioFilePlayer

{

public:

    AudioFilePlayer (const FSRef    *inFileRef);

    ~AudioFilePlayer();

    void            SetDestination (AudioUnit                   &inDestUnit, 

                                int                             inBusNumber);

    void            SetNotifier (AudioFilePlayNotifier inNotifier, void *inRefCon)

    {

        mNotifier = inNotifier;

        mRefCon = inRefCon;

    }

    void            SetStartFrame (int frame); // seek in the file

    int             GetCurrentFrame (); // get the current frame position

    void            SetStopFrame (int frame);   // set limit in the file

    void            Connect();

    void            Disconnect();

    void            DoNotification (OSStatus inError) const;

    bool            IsConnected () const { return mConnected; }

    UInt32          GetBusNumber () const { return mBusNumber; }

    AudioUnit       GetDestUnit () const { return mPlayUnit; }

    AudioConverterRef   GetAudioConverter() const { return mConverter; }

#if DEBUG    

    void            Print() const 

    {

        CAShow (mAudioFileID);

        printf ("Destination Bus:%ld\n", GetBusNumber());

        printf ("Is 'aunt' unit:%s\n", (mIsAUNTUnit ? "true" : "false"));

        printf ("Is Connected:%s\n", (IsConnected() ? "true" : "false"));

        if (mConverter) CAShow (mConverter);

          printf ("- - - - - - - - - - - - - - \n");

    }

#endif

    const AudioStreamBasicDescription&      GetFileFormat() const { return mFileDescription; }

private:

    AudioUnit                       mPlayUnit;

    UInt32                          mBusNumber;

    AudioFileID                     mAudioFileID;

    AudioUnitInputCallback          mInputCallback;

    AudioStreamBasicDescription     mFileDescription;

    bool                            mConnected;

    bool                            mIsAUNTUnit;

    AudioFileManager*               mAudioFileManager;

    AudioConverterRef               mConverter;

    AudioFilePlayNotifier           mNotifier;

    void*                           mRefCon;

    int                             mStartFrame;

#pragma mark __________ Private_Methods

    void        OpenFile (const FSRef *inRef, SInt64& outFileSize);

};

#pragma mark __________ AudioFileManager

class AudioFileManager

{

public:

    AudioFileManager (AudioFilePlayer& inParent, AudioFileID inFile)

        : mParent (inParent),

          mAudioFileID (inFile),

          mFileBuffer (0),

          mByteCounter (0)

        {}

    virtual ~AudioFileManager();

    void                Connect (AudioConverterRef inConverter) 

    {

        mParentConverter = inConverter;

        DoConnect();

    }

        // this method should NOT be called by an object of this class

        // as it is called by the parent's Disconnect() method

    virtual void        Disconnect () {}

    const AudioFileID&  GetFileID() const { return mAudioFileID; }

    const char*         GetFileBuffer () { return mFileBuffer; }

    const AudioFilePlayer&  GetParent () const { return mParent; }

    virtual void        SetPosition (SInt64 pos) = 0;  // seek/rewind in the file

    virtual int         GetByteCounter () { return mByteCounter; } // return actual bytes streamed to audio hardware

    virtual void        SetEndOfFile (SInt64 pos) = 0;  // set the "EOF" (will behave just like it reached eof)

protected:

    AudioFilePlayer&            mParent;

    AudioConverterRef           mParentConverter;

    const AudioFileID           mAudioFileID;

    char*                       mFileBuffer;

    OSStatus            Render (AudioBuffer &ioData);

    int                         mByteCounter;

    virtual OSStatus    GetFileData (void** inOutData, UInt32 *inOutDataSize) = 0;

    virtual void        DoConnect () = 0;

    virtual void        AfterRender () = 0;

public:

    static OSStatus     FileInputProc (void                             *inRefCon, 

                                        AudioUnitRenderActionFlags      inActionFlags,

                                        const AudioTimeStamp            *inTimeStamp, 

                                        UInt32                          inBusNumber, 

                                        AudioBuffer                     *ioData);

    static OSStatus     ACInputProc (AudioConverterRef          inAudioConverter,

                                            UInt32*                     outDataSize,

                                            void**                      outData,

                                            void*                       inUserData);

};

#pragma mark __________ AudioFileReaderThread

class AudioFileReaderThread 

    : public AudioFileManager

{

public:

    const UInt32    mChunkSize;

    SInt64          mFileLength;

    SInt64          mReadFilePosition;

    bool            mWriteToFirstBuffer;

    bool            mFinishedReadingData;

    AudioFileReaderThread (AudioFilePlayer  &inParent, 

                            AudioFileID     &inFile, 

                            SInt64          inFileLength,

                            UInt32          inChunkSize);

    virtual void        Disconnect ();

    virtual void        SetPosition (SInt64 pos);  // seek/rewind in the file

    virtual void        SetEndOfFile (SInt64 pos);  // set the "EOF" (will behave just like it reached eof)

protected:

    virtual void        DoConnect ();

    virtual OSStatus    GetFileData (void** inOutData, UInt32 *inOutDataSize);

    virtual void        AfterRender ();

private:

    bool                        mReadFromFirstBuffer;

    bool                        mLockUnsuccessful;

    bool                        mIsEngaged;

    int                         mNumTimesAskedSinceFinished;

};

#endif