src/cdrom/macosx/AudioFilePlayer.h
author Sam Lantinga <slouken@libsdl.org>
Tue, 15 Apr 2003 16:33:56 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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    This file based on Apple sample code. We haven't changed the file name, 
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    so if you want to see the original search for it on apple.com/developer
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*/
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//  AudioFilePlayer.h
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//
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#ifndef __AudioFilePlayer_H__
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#define __AudioFilePlayer_H__
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#include <CoreServices/CoreServices.h>
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#include <AudioToolbox/AudioToolbox.h>
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#include <AudioUnit/AudioUnit.h>
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#include "SDL_Error.h"
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const char* AudioFilePlayerErrorStr (OSStatus error);
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void ThrowResult (OSStatus result, const char *str);
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#define THROW_RESULT(str)                                       \
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    if (result) {                                               \
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        ThrowResult (result, str);                              \
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    }
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typedef void (*AudioFilePlayNotifier)(void          *inRefCon,
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                                    OSStatus        inStatus);
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enum {
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    kAudioFilePlayErr_FilePlayUnderrun = -10000,
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    kAudioFilePlay_FileIsFinished = -10001,
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    kAudioFilePlay_PlayerIsUninitialized = -10002
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};
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class AudioFileManager;
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#pragma mark __________ AudioFilePlayer
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class AudioFilePlayer
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{
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public:
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    AudioFilePlayer (const FSRef    *inFileRef);
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    ~AudioFilePlayer();
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    void            SetDestination (AudioUnit                   &inDestUnit, 
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                                int                             inBusNumber);
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    void            SetNotifier (AudioFilePlayNotifier inNotifier, void *inRefCon)
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    {
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        mNotifier = inNotifier;
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        mRefCon = inRefCon;
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    }
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    void            SetStartFrame (int frame); // seek in the file
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    int             GetCurrentFrame (); // get the current frame position
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    void            SetStopFrame (int frame);   // set limit in the file
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    void            Connect();
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    void            Disconnect();
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    void            DoNotification (OSStatus inError) const;
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    bool            IsConnected () const { return mConnected; }
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    UInt32          GetBusNumber () const { return mBusNumber; }
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    AudioUnit       GetDestUnit () const { return mPlayUnit; }
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    AudioConverterRef   GetAudioConverter() const { return mConverter; }
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#if DEBUG    
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    void            Print() const 
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    {
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        CAShow (mAudioFileID);
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        printf ("Destination Bus:%ld\n", GetBusNumber());
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        printf ("Is 'aunt' unit:%s\n", (mIsAUNTUnit ? "true" : "false"));
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        printf ("Is Connected:%s\n", (IsConnected() ? "true" : "false"));
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        if (mConverter) CAShow (mConverter);
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          printf ("- - - - - - - - - - - - - - \n");
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    }
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#endif
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    const AudioStreamBasicDescription&      GetFileFormat() const { return mFileDescription; }
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private:
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    AudioUnit                       mPlayUnit;
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    UInt32                          mBusNumber;
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    AudioFileID                     mAudioFileID;
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    AudioUnitInputCallback          mInputCallback;
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    AudioStreamBasicDescription     mFileDescription;
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    bool                            mConnected;
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    bool                            mIsAUNTUnit;
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    AudioFileManager*               mAudioFileManager;
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    AudioConverterRef               mConverter;
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    AudioFilePlayNotifier           mNotifier;
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    void*                           mRefCon;
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    int                             mStartFrame;
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#pragma mark __________ Private_Methods
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    void        OpenFile (const FSRef *inRef, SInt64& outFileSize);
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};
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#pragma mark __________ AudioFileManager
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class AudioFileManager
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{
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public:
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    AudioFileManager (AudioFilePlayer& inParent, AudioFileID inFile)
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        : mParent (inParent),
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          mAudioFileID (inFile),
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          mFileBuffer (0),
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          mByteCounter (0)
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        {}
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    virtual ~AudioFileManager();
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    void                Connect (AudioConverterRef inConverter) 
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    {
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        mParentConverter = inConverter;
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        DoConnect();
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    }
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        // this method should NOT be called by an object of this class
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        // as it is called by the parent's Disconnect() method
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    virtual void        Disconnect () {}
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    const AudioFileID&  GetFileID() const { return mAudioFileID; }
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    const char*         GetFileBuffer () { return mFileBuffer; }
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    const AudioFilePlayer&  GetParent () const { return mParent; }
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    virtual void        SetPosition (SInt64 pos) = 0;  // seek/rewind in the file
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    virtual int         GetByteCounter () { return mByteCounter; } // return actual bytes streamed to audio hardware
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    virtual void        SetEndOfFile (SInt64 pos) = 0;  // set the "EOF" (will behave just like it reached eof)
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protected:
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    AudioFilePlayer&            mParent;
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    AudioConverterRef           mParentConverter;
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    const AudioFileID           mAudioFileID;
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    char*                       mFileBuffer;
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    OSStatus            Render (AudioBuffer &ioData);
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    int                         mByteCounter;
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    virtual OSStatus    GetFileData (void** inOutData, UInt32 *inOutDataSize) = 0;
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    virtual void        DoConnect () = 0;
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    virtual void        AfterRender () = 0;
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public:
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    static OSStatus     FileInputProc (void                             *inRefCon, 
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                                        AudioUnitRenderActionFlags      inActionFlags,
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                                        const AudioTimeStamp            *inTimeStamp, 
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                                        UInt32                          inBusNumber, 
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                                        AudioBuffer                     *ioData);
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    static OSStatus     ACInputProc (AudioConverterRef          inAudioConverter,
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                                            UInt32*                     outDataSize,
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                                            void**                      outData,
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                                            void*                       inUserData);
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};
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#pragma mark __________ AudioFileReaderThread
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class AudioFileReaderThread 
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    : public AudioFileManager
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{
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public:
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    const UInt32    mChunkSize;
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    SInt64          mFileLength;
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    SInt64          mReadFilePosition;
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    bool            mWriteToFirstBuffer;
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    bool            mFinishedReadingData;
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    AudioFileReaderThread (AudioFilePlayer  &inParent, 
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                            AudioFileID     &inFile, 
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                            SInt64          inFileLength,
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                            UInt32          inChunkSize);
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    virtual void        Disconnect ();
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    virtual void        SetPosition (SInt64 pos);  // seek/rewind in the file
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    virtual void        SetEndOfFile (SInt64 pos);  // set the "EOF" (will behave just like it reached eof)
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protected:
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    virtual void        DoConnect ();
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    virtual OSStatus    GetFileData (void** inOutData, UInt32 *inOutDataSize);
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    virtual void        AfterRender ();
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private:
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    bool                        mReadFromFirstBuffer;
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    bool                        mLockUnsuccessful;
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    bool                        mIsEngaged;
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    int                         mNumTimesAskedSinceFinished;
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};
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#endif