1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2004 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Library General Public 7 License as published by the Free Software Foundation; either 8 version 2 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Library General Public License for more details. 14 15 You should have received a copy of the GNU Library General Public 16 License along with this library; if not, write to the Free 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 19 Sam Lantinga 20 slouken (at) libsdl.org 21 22 This file based on Apple sample code. We haven't changed the file name, 23 so if you want to see the original search for it on apple.com/developer 24 */ 25 #include "SDL_config.h" 26 27 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 28 AudioFilePlayer.h 29 */ 30 #ifndef __AudioFilePlayer_H__ 31 #define __AudioFilePlayer_H__ 32 33 #include <CoreServices/CoreServices.h> 34 35 #include <AudioUnit/AudioUnit.h> 36 37 #include "SDL_error.h" 38 39 const char* AudioFilePlayerErrorStr (OSStatus error); 40 41 /* 42 void ThrowResult (OSStatus result, const char *str); 43 44 #define THROW_RESULT(str) \ 45 if (result) { \ 46 ThrowResult (result, str); \ 47 } 48 */ 49 50 typedef void (*AudioFilePlayNotifier)(void *inRefCon, 51 OSStatus inStatus); 52 53 enum { 54 kAudioFilePlayErr_FilePlayUnderrun = -10000, 55 kAudioFilePlay_FileIsFinished = -10001, 56 kAudioFilePlay_PlayerIsUninitialized = -10002 57 }; 58 59 60 struct S_AudioFileManager; 61 62 #pragma mark __________ AudioFilePlayer 63 typedef struct S_AudioFilePlayer 64 { 65 /*public:*/ 66 int (*SetDestination)(struct S_AudioFilePlayer *afp, AudioUnit *inDestUnit); 67 void (*SetNotifier)(struct S_AudioFilePlayer *afp, AudioFilePlayNotifier inNotifier, void *inRefCon); 68 void (*SetStartFrame)(struct S_AudioFilePlayer *afp, int frame); /* seek in the file */ 69 int (*GetCurrentFrame)(struct S_AudioFilePlayer *afp); /* get the current frame position */ 70 void (*SetStopFrame)(struct S_AudioFilePlayer *afp, int frame); /* set limit in the file */ 71 int (*Connect)(struct S_AudioFilePlayer *afp); 72 void (*Disconnect)(struct S_AudioFilePlayer *afp); 73 void (*DoNotification)(struct S_AudioFilePlayer *afp, OSStatus inError); 74 int (*IsConnected)(struct S_AudioFilePlayer *afp); 75 AudioUnit (*GetDestUnit)(struct S_AudioFilePlayer *afp); 76 void (*Print)(struct S_AudioFilePlayer *afp); 77 78 /*private:*/ 79 AudioUnit mPlayUnit; 80 SInt16 mForkRefNum; 81 82 AudioUnitInputCallback mInputCallback; 83 84 AudioStreamBasicDescription mFileDescription; 85 86 int mConnected; 87 88 struct S_AudioFileManager* mAudioFileManager; 89 90 AudioFilePlayNotifier mNotifier; 91 void* mRefCon; 92 93 int mStartFrame; 94 95 #pragma mark __________ Private_Methods 96 97 int (*OpenFile)(struct S_AudioFilePlayer *afp, const FSRef *inRef, SInt64 *outFileSize); 98 } AudioFilePlayer; 99 100 101 AudioFilePlayer *new_AudioFilePlayer(const FSRef *inFileRef); 102 void delete_AudioFilePlayer(AudioFilePlayer *afp); 103 104 105 106 #pragma mark __________ AudioFileManager 107 typedef struct S_AudioFileManager 108 { 109 /*public:*/ 110 /* this method should NOT be called by an object of this class 111 as it is called by the parent's Disconnect() method */ 112 void (*Disconnect)(struct S_AudioFileManager *afm); 113 int (*DoConnect)(struct S_AudioFileManager *afm); 114 OSStatus (*Read)(struct S_AudioFileManager *afm, char *buffer, UInt32 *len); 115 const char* (*GetFileBuffer)(struct S_AudioFileManager *afm); 116 const AudioFilePlayer *(*GetParent)(struct S_AudioFileManager *afm); 117 void (*SetPosition)(struct S_AudioFileManager *afm, SInt64 pos); /* seek/rewind in the file */ 118 int (*GetByteCounter)(struct S_AudioFileManager *afm); /* return actual bytes streamed to audio hardware */ 119 void (*SetEndOfFile)(struct S_AudioFileManager *afm, SInt64 pos); /* set the "EOF" (will behave just like it reached eof) */ 120 121 /*protected:*/ 122 AudioFilePlayer* mParent; 123 SInt16 mForkRefNum; 124 SInt64 mAudioDataOffset; 125 126 char* mFileBuffer; 127 128 int mByteCounter; 129 130 int mReadFromFirstBuffer; 131 int mLockUnsuccessful; 132 int mIsEngaged; 133 134 int mNumTimesAskedSinceFinished; 135 136 137 void* mTmpBuffer; 138 UInt32 mBufferSize; 139 UInt32 mBufferOffset; 140 /*public:*/ 141 UInt32 mChunkSize; 142 SInt64 mFileLength; 143 SInt64 mReadFilePosition; 144 int mWriteToFirstBuffer; 145 int mFinishedReadingData; 146 147 /*protected:*/ 148 OSStatus (*Render)(struct S_AudioFileManager *afm, AudioBuffer *ioData); 149 OSStatus (*GetFileData)(struct S_AudioFileManager *afm, void** inOutData, UInt32 *inOutDataSize); 150 void (*AfterRender)(struct S_AudioFileManager *afm); 151 152 /*public:*/ 153 /*static*/ 154 OSStatus (*FileInputProc)(void *inRefCon, 155 AudioUnitRenderActionFlags inActionFlags, 156 const AudioTimeStamp *inTimeStamp, 157 UInt32 inBusNumber, 158 AudioBuffer *ioData); 159 } AudioFileManager; 160 161 162 AudioFileManager *new_AudioFileManager (AudioFilePlayer *inParent, 163 SInt16 inForkRefNum, 164 SInt64 inFileLength, 165 UInt32 inChunkSize); 166 167 void delete_AudioFileManager(AudioFileManager *afm); 168 169 #endif 170 171
