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+/*
+ Copyright (c) 2010 Steve Oldmeadow
+ 
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ 
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ 
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+ 
+ $Id$
+ */
+
+#import "CocosDenshion.h"
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 30000
+    #import <AVFoundation/AVFoundation.h>
+#else
+    #import "CDXMacOSXSupport.h"
+#endif
+
+/** Different modes of the engine */
+typedef enum {
+        kAMM_FxOnly,                                    //!Other apps will be able to play audio
+        kAMM_FxPlusMusic,                               //!Only this app will play audio
+        kAMM_FxPlusMusicIfNoOtherAudio, //!If another app is playing audio at start up then allow it to continue and don't play music
+        kAMM_MediaPlayback,                             //!This app takes over audio e.g music player app
+        kAMM_PlayAndRecord                              //!App takes over audio and has input and output
+} tAudioManagerMode;
+
+/** Possible states of the engine */
+typedef enum {
+        kAMStateUninitialised, //!Audio manager has not been initialised - do not use
+        kAMStateInitialising,  //!Audio manager is in the process of initialising - do not use
+        kAMStateInitialised        //!Audio manager is initialised - safe to use
+} tAudioManagerState;
+
+typedef enum {
+        kAMRBDoNothing,                     //Audio manager will not do anything on resign or becoming active
+        kAMRBStopPlay,                          //Background music is stopped on resign and resumed on become active
+        kAMRBStop                                       //Background music is stopped on resign but not resumed - maybe because you want to do this from within your game
+} tAudioManagerResignBehavior;
+
+/** Notifications */
+extern NSString * const kCDN_AudioManagerInitialised;
+
+@interface CDAsynchInitialiser : NSOperation {} 
+@end
+
+/** CDAudioManager supports two long audio source channels called left and right*/
+typedef enum {
+        kASC_Left = 0,
+        kASC_Right = 1
+} tAudioSourceChannel;  
+
+typedef enum {
+        kLAS_Init,
+        kLAS_Loaded,
+        kLAS_Playing,
+        kLAS_Paused,
+        kLAS_Stopped,
+} tLongAudioSourceState;
+
+@class CDLongAudioSource;
+@protocol CDLongAudioSourceDelegate <NSObject>
+@optional
+/** The audio source completed playing */
+- (void) cdAudioSourceDidFinishPlaying:(CDLongAudioSource *) audioSource;
+/** The file used to load the audio source has changed */
+- (void) cdAudioSourceFileDidChange:(CDLongAudioSource *) audioSource;
+@end
+
+/**
+ CDLongAudioSource represents an audio source that has a long duration which makes
+ it costly to load into memory for playback as an effect using CDSoundEngine. Examples
+ include background music and narration tracks. The audio file may or may not be compressed.
+ Bear in mind that current iDevices can only use hardware to decode a single compressed
+ audio file at a time and playing multiple compressed files will result in a performance drop
+ as software decompression will take place.
+ @since v0.99
+ */
+@interface CDLongAudioSource : NSObject <AVAudioPlayerDelegate, CDAudioInterruptProtocol>{
+        AVAudioPlayer   *audioSourcePlayer;
+        NSString                *audioSourceFilePath;
+        NSInteger               numberOfLoops;
+        float                   volume;
+        id<CDLongAudioSourceDelegate> delegate; 
+        BOOL                    mute;
+        BOOL                    enabled_;
+        BOOL                    backgroundMusic;
+@public 
+        BOOL                    systemPaused;//Used for auto resign handling
+        NSTimeInterval  systemPauseLocation;//Used for auto resign handling
+@protected
+        tLongAudioSourceState state;
+}       
+@property (readonly) AVAudioPlayer *audioSourcePlayer;
+@property (readonly) NSString *audioSourceFilePath;
+@property (readwrite, nonatomic) NSInteger numberOfLoops;
+@property (readwrite, nonatomic) float volume;
+@property (assign) id<CDLongAudioSourceDelegate> delegate;
+/* This long audio source functions as background music */
+@property (readwrite, nonatomic) BOOL backgroundMusic;
+
+/** Loads the file into the audio source */
+-(void) load:(NSString*) filePath;
+/** Plays the audio source */
+-(void) play;
+/** Stops playing the audio soruce */
+-(void) stop;
+/** Pauses the audio source */
+-(void) pause;
+/** Rewinds the audio source */
+-(void) rewind;
+/** Resumes playing the audio source if it was paused */
+-(void) resume;
+/** Returns whether or not the audio source is playing */
+-(BOOL) isPlaying;
+
+@end
+
+/** 
+ CDAudioManager manages audio requirements for a game.  It provides access to a CDSoundEngine object
+ for playing sound effects.  It provides access to two CDLongAudioSource object (left and right channel)
+ for playing long duration audio such as background music and narration tracks.  Additionally it manages
+ the audio session to take care of things like audio session interruption and interacting with the audio
+ of other apps that are running on the device.
+ 
+ Requirements:
+ - Firmware: OS 2.2 or greater 
+ - Files: CDAudioManager.*, CocosDenshion.*
+ - Frameworks: OpenAL, AudioToolbox, AVFoundation
+ @since v0.8
+ */
+@interface CDAudioManager : NSObject <CDLongAudioSourceDelegate, CDAudioInterruptProtocol, AVAudioSessionDelegate> {
+        CDSoundEngine           *soundEngine;
+        CDLongAudioSource       *backgroundMusic;
+        NSMutableArray          *audioSourceChannels;
+        NSString*                       _audioSessionCategory;
+        BOOL                            _audioWasPlayingAtStartup;
+        tAudioManagerMode       _mode;
+        SEL backgroundMusicCompletionSelector;
+        id backgroundMusicCompletionListener;
+        BOOL willPlayBackgroundMusic;
+        BOOL _mute;
+        BOOL _resigned;
+        BOOL _interrupted;
+        BOOL _audioSessionActive;
+        BOOL enabled_;
+        
+        //For handling resign/become active
+        BOOL _isObservingAppEvents;
+        tAudioManagerResignBehavior _resignBehavior;
+}
+
+@property (readonly) CDSoundEngine *soundEngine;
+@property (readonly) CDLongAudioSource *backgroundMusic;
+@property (readonly) BOOL willPlayBackgroundMusic;
+
+/** Returns the shared singleton */
++ (CDAudioManager *) sharedManager;
++ (tAudioManagerState) sharedManagerState;
+/** Configures the shared singleton with a mode*/
++ (void) configure: (tAudioManagerMode) mode;
+/** Initializes the engine asynchronously with a mode */
++ (void) initAsynchronously: (tAudioManagerMode) mode;
+/** Initializes the engine synchronously with a mode, channel definition and a total number of channels */
+- (id) init: (tAudioManagerMode) mode;
+-(void) audioSessionInterrupted;
+-(void) audioSessionResumed;
+-(void) setResignBehavior:(tAudioManagerResignBehavior) resignBehavior autoHandle:(BOOL) autoHandle;
+/** Returns true is audio is muted at a hardware level e.g user has ringer switch set to off */
+-(BOOL) isDeviceMuted;
+/** Returns true if another app is playing audio such as the iPod music player */
+-(BOOL) isOtherAudioPlaying;
+/** Sets the way the audio manager interacts with the operating system such as whether it shares output with other apps or obeys the mute switch */
+-(void) setMode:(tAudioManagerMode) mode;
+/** Shuts down the shared audio manager instance so that it can be reinitialised */
++(void) end;
+
+/** Call if you want to use built in resign behavior but need to do some additional audio processing on resign active. */
+- (void) applicationWillResignActive;
+/** Call if you want to use built in resign behavior but need to do some additional audio processing on become active. */
+- (void) applicationDidBecomeActive;
+
+//New AVAudioPlayer API
+/** Loads the data from the specified file path to the channel's audio source */
+-(CDLongAudioSource*) audioSourceLoad:(NSString*) filePath channel:(tAudioSourceChannel) channel;
+/** Retrieves the audio source for the specified channel */
+-(CDLongAudioSource*) audioSourceForChannel:(tAudioSourceChannel) channel;
+
+//Legacy AVAudioPlayer API
+/** Plays music in background. The music can be looped or not
+ It is recommended to use .aac files as background music since they are decoded by the device (hardware).
+ */
+-(void) playBackgroundMusic:(NSString*) filePath loop:(BOOL) loop;
+/** Preloads a background music */
+-(void) preloadBackgroundMusic:(NSString*) filePath;
+/** Stops playing the background music */
+-(void) stopBackgroundMusic;
+/** Pauses the background music */
+-(void) pauseBackgroundMusic;
+/** Rewinds the background music */
+-(void) rewindBackgroundMusic;
+/** Resumes playing the background music */
+-(void) resumeBackgroundMusic;
+/** Returns whether or not the background music is playing */
+-(BOOL) isBackgroundMusicPlaying;
+
+-(void) setBackgroundMusicCompletionListener:(id) listener selector:(SEL) selector;
+
+@end
+
+/** Fader for long audio source objects */
+@interface CDLongAudioSourceFader : CDPropertyModifier{}
+@end
+
+static const int kCDNoBuffer = -1;
+
+/** Allows buffers to be associated with file names */
+@interface CDBufferManager:NSObject{
+        NSMutableDictionary* loadedBuffers;
+        NSMutableArray  *freedBuffers;
+        CDSoundEngine *soundEngine;
+        int nextBufferId;
+}
+
+-(id) initWithEngine:(CDSoundEngine *) theSoundEngine;
+-(int) bufferForFile:(NSString*) filePath create:(BOOL) create;
+-(void) releaseBufferForFile:(NSString *) filePath;
+
+@end
+