/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2004 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 <AudioUnit/AudioUnit.h>

#include "SDL_error.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            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; }

    AudioUnit       GetDestUnit () const { return mPlayUnit; }

#if DEBUG    

    void            Print() const 

    {

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

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

    }

#endif

private:

    AudioUnit                       mPlayUnit;

    SInt16                          mForkRefNum;

    AudioUnitInputCallback          mInputCallback;

    AudioStreamBasicDescription     mFileDescription;

    bool                            mConnected;

    AudioFileManager*               mAudioFileManager;

    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, 

                      SInt16          inForkRefNum, 

                      SInt64          inFileLength,

                      UInt32          inChunkSize);

    ~AudioFileManager();

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

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

    void                Disconnect ();

    OSStatus            Read(char *buffer, UInt32 *len);

    const char*         GetFileBuffer () { return mFileBuffer; }

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

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

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

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

protected:

    AudioFilePlayer&    mParent;

    SInt16              mForkRefNum;

    SInt64              mAudioDataOffset;

    char*               mFileBuffer;

    int                 mByteCounter;

    bool                mReadFromFirstBuffer;

    bool                mLockUnsuccessful;

    bool                mIsEngaged;

    int                 mNumTimesAskedSinceFinished;

public:

    const UInt32        mChunkSize;

    SInt64              mFileLength;

    SInt64              mReadFilePosition;

    bool                mWriteToFirstBuffer;

    bool                mFinishedReadingData;

protected:

    OSStatus            Render (AudioBuffer &ioData);

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

    void                AfterRender ();

public:

    static OSStatus     FileInputProc (void                             *inRefCon, 

                                        AudioUnitRenderActionFlags      inActionFlags,

                                        const AudioTimeStamp            *inTimeStamp, 

                                        UInt32                          inBusNumber, 

                                        AudioBuffer                     *ioData);

};

#endif