text: //
  //  AudioStreamer.h
  //  StreamingAudioPlayer
  //
  //  Created by Matt Gallagher on 27/09/08.
  //  Copyright 2008 Matt Gallagher. All rights reserved.
  //
  //  Permission is given to use this source code file, free of charge, in any
  //  project, commercial or otherwise, entirely at your risk, with the condition
  //  that any redistribution (in part or whole) of source code must retain
  //  this copyright and permission notice. Attribution in compiled projects is
  //  appreciated but not required.
  //
  
  // This file is meant to be a repository for common defintions between AudioStreamerBC (backcompat, 3.1.x)
  // and AudioStreamerCUR (iOS 3.2+), as well as a proxy which shunts messages to the appropriate AudioStreamer.
  // - SPT
  
  // Also note that we've had to change enumeration and class names here - this is because
  // some modules may require the use of AudioStreamer in external libraries and the
  // symbols cannot be changed on that end.  The use of common symbols in BangWD without
  // namespaces is a recurring problem, and we can thank Objective-C for it.
  // - SPT
  
  #ifdef USE_TI_MEDIA
  
  #define LOG_QUEUED_BUFFERS 0
  
  #define kNumAQBufs 16			// Number of audio queue buffers we allocate.
  								// Needs to be big enough to keep audio pipeline
  								// busy (non-zero number of queued buffers) but
  								// not so big that audio takes too long to begin
  								// (kNumAQBufs * kAQBufSize of data must be
  								// loaded before playback will start).
  								// Set LOG_QUEUED_BUFFERS to 1 to log how many
  								// buffers are queued at any time -- if it drops
  								// to zero too often, this value may need to
  								// increase. Min 3, typical 8-24.
  
  #define kAQMaxPacketDescs 512	// Number of packet descriptions in our array
  #define kAQDefaultBufSize 2048	// Number of bytes in each audio queue buffer
                                  // Needs to be big enough to hold a packet of
                                  // audio from the audio file. If number is too
                                  // large, queuing of audio before playback starts
                                  // will take too long.
                                  // Highly compressed files can use smaller
                                  // numbers (512 or less). 2048 should hold all
                                  // but the largest packets. A buffer size error
                                  // will occur if this number is too small.
  
  
  typedef enum
  {
  	AS_INITIALIZED = 0,
  	AS_STARTING_FILE_THREAD,
  	AS_WAITING_FOR_DATA,
  	AS_WAITING_FOR_QUEUE_TO_START,
  	AS_PLAYING,
  	AS_BUFFERING,
  	AS_STOPPING,
  	AS_STOPPED,
  	AS_PAUSED,
  	AS_FLUSHING_EOF
  } AudioStreamerState;
  
  typedef enum
  {
  	AS_NO_STOP = 0,
  	AS_STOPPING_EOF,
  	AS_STOPPING_USER_ACTION,
  	AS_STOPPING_ERROR,
  	AS_STOPPING_TEMPORARILY
  } AudioStreamerStopReason;
  
  typedef enum
  {
  	AS_NO_ERROR = 0,
  	AS_NETWORK_CONNECTION_FAILED,
  	AS_FILE_STREAM_GET_PROPERTY_FAILED,
  	AS_FILE_STREAM_SEEK_FAILED,
  	AS_FILE_STREAM_PARSE_BYTES_FAILED,
  	AS_FILE_STREAM_OPEN_FAILED,
  	AS_FILE_STREAM_CLOSE_FAILED,
  	AS_AUDIO_DATA_NOT_FOUND,
  	AS_AUDIO_QUEUE_CREATION_FAILED,
  	AS_AUDIO_QUEUE_BUFFER_ALLOCATION_FAILED,
  	AS_AUDIO_QUEUE_ENQUEUE_FAILED,
  	AS_AUDIO_QUEUE_ADD_LISTENER_FAILED,
  	AS_AUDIO_QUEUE_REMOVE_LISTENER_FAILED,
  	AS_AUDIO_QUEUE_START_FAILED,
  	AS_AUDIO_QUEUE_PAUSE_FAILED,
  	AS_AUDIO_QUEUE_BUFFER_MISMATCH,
  	AS_AUDIO_QUEUE_DISPOSE_FAILED,
  	AS_AUDIO_QUEUE_STOP_FAILED,
  	AS_AUDIO_QUEUE_FLUSH_FAILED,
  	AS_AUDIO_STREAMER_FAILED,
  	AS_GET_AUDIO_TIME_FAILED,
  	AS_AUDIO_BUFFER_TOO_SMALL
  } AudioStreamerErrorCode;
  
  extern NSString * const ASStatusChangedNotification;
  
  @protocol AudioStreamerDelegate<NSObject>
  -(void)playbackStateChanged:(id)sender;
  @end
  
  
  @protocol AudioStreamerProtocol<NSObject>
  @property AudioStreamerErrorCode errorCode;
  @property (nonatomic, readonly) AudioStreamerState state;
  @property (readonly) double progress;
  @property (readonly) double duration; 
  @property (readwrite) UInt32 bitRate;
  @property (readwrite) double volume;
  @property (readwrite,assign) id<AudioStreamerDelegate> delegate;
  @property (nonatomic,readwrite,assign) UInt32 bufferSize;
  
  - (void)start;
  - (void)stop;
  - (void)pause;
  - (BOOL)isPlaying;
  - (BOOL)isPaused;
  - (BOOL)isWaiting;
  - (BOOL)isIdle;
  @end
  
  @interface AudioStreamer : NSObject<AudioStreamerProtocol,AudioStreamerDelegate>
  {
  	id<AudioStreamerProtocol> streamer;
  	id<AudioStreamerDelegate> delegate;
  }
  
  - (id)initWithURL:(NSURL *)aURL;
  + (NSString*)stringForErrorCode:(AudioStreamerErrorCode)code;
  
  @end
  
  #endif
  