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AudioFilePlayer.h
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AudioFilePlayer.h
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/*
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
*/
#include "SDL_config.h"
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
};
struct S_AudioFileManager;
#pragma mark __________ AudioFilePlayer
typedef struct S_AudioFilePlayer
{
/*public:*/
int (*SetDestination)(struct S_AudioFilePlayer *afp, AudioUnit *inDestUnit);
void (*SetNotifier)(struct S_AudioFilePlayer *afp, AudioFilePlayNotifier inNotifier, void *inRefCon);
void (*SetStartFrame)(struct S_AudioFilePlayer *afp, int frame); /* seek in the file */
int (*GetCurrentFrame)(struct S_AudioFilePlayer *afp); /* get the current frame position */
void (*SetStopFrame)(struct S_AudioFilePlayer *afp, int frame); /* set limit in the file */
int (*Connect)(struct S_AudioFilePlayer *afp);
void (*Disconnect)(struct S_AudioFilePlayer *afp);
void (*DoNotification)(struct S_AudioFilePlayer *afp, OSStatus inError);
int (*IsConnected)(struct S_AudioFilePlayer *afp);
AudioUnit (*GetDestUnit)(struct S_AudioFilePlayer *afp);
void (*Print)(struct S_AudioFilePlayer *afp);
/*private:*/
AudioUnit mPlayUnit;
SInt16 mForkRefNum;
AudioUnitInputCallback mInputCallback;
AudioStreamBasicDescription mFileDescription;
int mConnected;
struct S_AudioFileManager* mAudioFileManager;
AudioFilePlayNotifier mNotifier;
void* mRefCon;
int mStartFrame;
#pragma mark __________ Private_Methods
int (*OpenFile)(struct S_AudioFilePlayer *afp, const FSRef *inRef, SInt64 *outFileSize);
} AudioFilePlayer;
AudioFilePlayer *new_AudioFilePlayer(const FSRef *inFileRef);
void delete_AudioFilePlayer(AudioFilePlayer *afp);
#pragma mark __________ AudioFileManager
typedef struct S_AudioFileManager
{
/*public:*/
/* this method should NOT be called by an object of this class
as it is called by the parent's Disconnect() method */
void (*Disconnect)(struct S_AudioFileManager *afm);
int (*DoConnect)(struct S_AudioFileManager *afm);
OSStatus (*Read)(struct S_AudioFileManager *afm, char *buffer, UInt32 *len);
const char* (*GetFileBuffer)(struct S_AudioFileManager *afm);
const AudioFilePlayer *(*GetParent)(struct S_AudioFileManager *afm);
void (*SetPosition)(struct S_AudioFileManager *afm, SInt64 pos); /* seek/rewind in the file */
int (*GetByteCounter)(struct S_AudioFileManager *afm); /* return actual bytes streamed to audio hardware */
void (*SetEndOfFile)(struct S_AudioFileManager *afm, SInt64 pos); /* set the "EOF" (will behave just like it reached eof) */
/*protected:*/
AudioFilePlayer* mParent;
SInt16 mForkRefNum;
SInt64 mAudioDataOffset;
char* mFileBuffer;
int mByteCounter;
int mReadFromFirstBuffer;
int mLockUnsuccessful;
int mIsEngaged;
int mNumTimesAskedSinceFinished;
void* mTmpBuffer;
UInt32 mBufferSize;
UInt32 mBufferOffset;
/*public:*/
UInt32 mChunkSize;
SInt64 mFileLength;
SInt64 mReadFilePosition;
int mWriteToFirstBuffer;
int mFinishedReadingData;
/*protected:*/
OSStatus (*Render)(struct S_AudioFileManager *afm, AudioBuffer *ioData);
OSStatus (*GetFileData)(struct S_AudioFileManager *afm, void** inOutData, UInt32 *inOutDataSize);
void (*AfterRender)(struct S_AudioFileManager *afm);
/*public:*/
/*static*/
OSStatus (*FileInputProc)(void *inRefCon,
AudioUnitRenderActionFlags inActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
AudioBuffer *ioData);
} AudioFileManager;
AudioFileManager *new_AudioFileManager (AudioFilePlayer *inParent,
SInt16 inForkRefNum,
SInt64 inFileLength,
UInt32 inChunkSize);
void delete_AudioFileManager(AudioFileManager *afm);
#endif