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//
// SDLStreamingMediaLifecycleManager.h
// SmartDeviceLink-iOS
//
// Created by Muller, Alexander (A.) on 2/16/17.
// Copyright © 2017 smartdevicelink. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <VideoToolbox/VideoToolbox.h>
#import "SDLHMILevel.h"
#import "SDLProtocolListener.h"
#import "SDLStreamingMediaManagerConstants.h"
@class SDLAbstractProtocol;
@class SDLStateMachine;
@class SDLTouchManager;
NS_ASSUME_NONNULL_BEGIN
typedef NSString SDLAppState;
extern SDLAppState *const SDLAppStateInactive;
extern SDLAppState *const SDLAppStateActive;
typedef NSString SDLVideoStreamState;
extern SDLVideoStreamState *const SDLVideoStreamStateStopped;
extern SDLVideoStreamState *const SDLVideoStreamStateStarting;
extern SDLVideoStreamState *const SDLVideoStreamStateReady;
extern SDLVideoStreamState *const SDLVideoStreamStateShuttingDown;
typedef NSString SDLAudioStreamState;
extern SDLAudioStreamState *const SDLAudioStreamStateStopped;
extern SDLAudioStreamState *const SDLAudioStreamStateStarting;
extern SDLAudioStreamState *const SDLAudioStreamStateReady;
extern SDLAudioStreamState *const SDLAudioStreamStateShuttingDown;
#pragma mark - Interface
@interface SDLStreamingMediaLifecycleManager : NSObject <SDLProtocolListener>
@property (strong, nonatomic, readonly) SDLStateMachine *appStateMachine;
@property (strong, nonatomic, readonly) SDLStateMachine *videoStreamStateMachine;
@property (strong, nonatomic, readonly) SDLStateMachine *audioStreamStateMachine;
@property (strong, nonatomic, readonly) SDLAppState *currentAppState;
@property (strong, nonatomic, readonly) SDLAudioStreamState *currentAudioStreamState;
@property (strong, nonatomic, readonly) SDLVideoStreamState *currentVideoStreamState;
@property (copy, nonatomic, nullable) SDLHMILevel hmiLevel;
@property (assign, nonatomic, readonly, getter=shouldRestartVideoStream) BOOL restartVideoStream;
/**
* Touch Manager responsible for providing touch event notifications.
*/
@property (nonatomic, strong, readonly) SDLTouchManager *touchManager;
/**
* Whether or not video streaming is supported
*
* @see SDLRegisterAppInterface SDLDisplayCapabilities
*/
@property (assign, nonatomic, readonly, getter=isVideoStreamingSupported) BOOL videoStreamingSupported;
/**
* Whether or not audio streaming is supported. Currently this is the same as videoStreamingSupported.
*/
@property (assign, nonatomic, readonly, getter=isAudioStreamingSupported) BOOL audioStreamingSupported;
/**
* Whether or not the video session is connected.
*/
@property (assign, nonatomic, readonly, getter=isVideoConnected) BOOL videoConnected;
/**
* Whether or not the video session is encrypted. This may be different than the requestedEncryptionType.
*/
@property (assign, nonatomic, readonly, getter=isVideoEncrypted) BOOL videoEncrypted;
/**
* Whether or not the audio session is connected.
*/
@property (assign, nonatomic, readonly, getter=isAudioConnected) BOOL audioConnected;
/**
* Whether or not the audio session is encrypted. This may be different than the requestedEncryptionType.
*/
@property (assign, nonatomic, readonly, getter=isAudioEncrypted) BOOL audioEncrypted;
/**
* Whether or not the video stream is paused due to either the application being backgrounded, the HMI state being either NONE or BACKGROUND, or the video stream not being ready.
*/
@property (assign, nonatomic, readonly, getter=isVideoStreamingPaused) BOOL videoStreamingPaused;
/**
* This is the current screen size of a connected display. This will be the size the video encoder uses to encode the raw image data.
*/
@property (assign, nonatomic, readonly) CGSize screenSize;
/**
* The pixel buffer pool reference returned back from an active VTCompressionSessionRef encoder.
*
* @warning This will only return a valid pixel buffer pool after the encoder has been initialized (when the video session has started).
* @discussion Clients may call this once and retain the resulting pool, this call is cheap enough that it's OK to call it once per frame.
*/
@property (assign, nonatomic, readonly, nullable) CVPixelBufferPoolRef pixelBufferPool;
/**
* The requested encryption type when a session attempts to connect. This setting applies to both video and audio sessions.
*
* DEFAULT: SDLStreamingEncryptionFlagAuthenticateAndEncrypt
*/
@property (assign, nonatomic) SDLStreamingEncryptionFlag requestedEncryptionType;
/**
* Creates a streaming manager with a specified encryption type.
*
* @param encryption The encryption type requested when starting to stream.
* @param videoEncoderSettings The video encoder settings to use with SDLVideoEncoder.
*
* @return An instance of SDLStreamingMediaManager
*/
- (instancetype)initWithEncryption:(SDLStreamingEncryptionFlag)encryption videoEncoderSettings:(nullable NSDictionary<NSString *, id> *)videoEncoderSettings NS_DESIGNATED_INITIALIZER;
/**
* Start the manager with a completion block that will be called when startup completes. This is used internally. To use an SDLStreamingMediaManager, you should use the manager found on `SDLManager`.
*
* @param completionHandler The block to be called when the manager's setup is complete.
*/
- (void)startWithProtocol:(SDLAbstractProtocol*)protocol completionHandler:(void (^)(BOOL success, NSError *__nullable error))completionHandler;
/**
* Stop the manager. This method is used internally.
*/
- (void)stop;
/**
* This method receives raw image data and will run iOS8+'s hardware video encoder to turn the data into a video stream, which will then be passed to the connected head unit.
*
* @param imageBuffer A CVImageBufferRef to be encoded by Video Toolbox
*
* @return Whether or not the data was successfully encoded and sent.
*/
- (BOOL)sendVideoData:(CVImageBufferRef)imageBuffer;
/**
* This method receives raw image data and will run iOS8+'s hardware video encoder to turn the data into a video stream, which will then be passed to the connected head unit.
*
* @param imageBuffer A CVImageBufferRef to be encoded by Video Toolbox
* @param presentationTimestamp A presentation timestamp for the frame, or kCMTimeInvalid if timestamp is unknown. If it's valid, it must be greater than the previous one.
*
* @return Whether or not the data was successfully encoded and sent.
*/
- (BOOL)sendVideoData:(CVImageBufferRef)imageBuffer presentationTimestamp:(CMTime)presentationTimestamp;
/**
* This method receives PCM audio data and will attempt to send that data across to the head unit for immediate playback
*
* @param audioData The data in PCM audio format, to be played
*
* @return Whether or not the data was successfully sent.
*/
- (BOOL)sendAudioData:(NSData *)audioData;
@end
NS_ASSUME_NONNULL_END
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