- how to handle AVPlayerItemDidPlayToEndTimeNotification for avplayer
- Error Handling Best Practices for HTTP Live Streaming
- AVPlayer doesn't have good error handling for live streaming issues
- Error Handling
- Error Handling in Swift
how to handle AVPlayerItemDidPlayToEndTimeNotification for avplayerIf you need to access information about the asset before you enqueue it for playback, you can use the methods of the AVAsynchronous Key Value Loading protocol to load the values you need. Alternatively, AVPlayer Item can automatically load the needed asset data for you by passing the desired set of keys to its init asset: automatically Loaded Asset Keys: initializer. When the player item is ready to play, those asset properties will have been loaded and are ready for use. AVPlayer Item is a dynamic object. You can use Key-value observing to observe these state changes as they occur. One of the most important player item properties to observe is its status. The status indicates if the item is ready for playback and generally available for use. When you first create a player item, its status has a value of AVPlayer Item. The following code example illustrates how to register and be notified of status changes:. To be notified of changes to the statusyou need to implement the observe Value for Key Path: of: change: context: method. This method is invoked whenever the status changes giving you the chance to take some action in response see example. The example retrieves the new status from the change dictionary and switches over its value. Initializes a player item with the specified asset and the asset keys to be automatically loaded. Sets the current playback time to the specified time and executes the specified block when the seek operation completes or is interrupted. Sets the current playback time within a specified time bound and invokes the specified block when the seek operation completes or is interrupted. A Boolean value that indicates whether playback has consumed all buffered media and that playback will stall or end. Returns the current time of the item as an NSDate object. The duration the player should buffer media from the network ahead of the playhead to guard against playback disruption. A Boolean value that indicates whether the player item can use network resources to keep the playback state up to date while paused. Selects a media option in a given media selection group and deselects all other options in that group. An array of additional metadata for the player item to supplement or override that is embedded in the underlying media asset. Language: Swift Objective-C. Class AVPlayer Item. An object used to model the timing and presentation state of an asset played by the player. SDKs iOS 4.
Error Handling Best Practices for HTTP Live Streaming
In general, common media formats can be played using the HTML5 video and audio elements. For information on the supported media containers, streaming format and DRM combinations, and network protocols, see the General Specifications. An AVPlay instance has various states, which determine the actions you can take. The following table lists the possible AVPlay instance states. The following figure shows the state changes and life-cycle of an AVPlay instance, and the playback control operations that drive state transitions. Open a media file using the open method. Relative local paths are not supported. Define the event handlers using the setListener method. The following table lists the available event handlers. For video media, set the media display area using the setDisplayRect method. The setDisplayRect method takes 4 parameters: the position from the left side of the screen, the position from the top of the screen, the width, and the height. For the purpose of the setDisplayRect method parameters, the TV screen resolution is always treated as x px, regardless of the application resolution or viewport size. If the application resolution is x px, simply set the same position values as defined in the object element style attribute. Otherwise, you must calculate the values for the setDisplayRect method parameters. If you use the setDisplayRect method to change the media display area size or position during media playback, the object element style attribute must also be changed correspondingly. By default, video is displayed full screen within the media display area. To fit the video to the media display area:. Failure to stop playback after the media has finished playing causes the media player window to show the final frame continuously. To remove the AVPlay instance, call the close method. Using the AVPlay APIyou can implement functionalities such as jumping to a specific time in the media, adjusting the playback rate, and switching audio tracks. To jump based on an absolute time, use the seekTo method:. To jump based on a relative time, use the jumpForward and jumpBackward methods:. You must check that the value of the parameter is within the valid range, based on the current playback time. You can control the playback rate of the media using the setSpeed method to set a multiplier for the playback rate. Positive parameter values play the media forwards, while negative values cause the media to play in reverse. For example, to play the media at double speed:. Retrieve the audio track list. It returns an array of objects for all tracks in the media. Each object has 3 properties:. Select the audio track. Call the setSelectTrack method with the track type and index number as parameters:. You can play drm contents as setting drm properties for each drm case properly using setDrm method in IDLE state. And, as using ondrmevent callback function, you can handle errors caused by incorrect drm settings or environments, and in the PlayReady GenChallenge case or Widevine Modular case, you can get the challenge data from AVPlay and get the license data from the license server through the corresponding the challenge data. Below figures are sequence diagram for each drm case, you can refer to the detailed information at the link. Unless otherwise specified, calling the method does not change the state of the AVPlay instance. Smart TV. VideoSplashScreen feature tutorial.
AVPlayer doesn't have good error handling for live streaming issues
In swift, error handling is the process which is used to respond and recover from error conditions in application. Swift provides us the support to capture and manipulate errors in application at runtime. Generally in swift, the major things which cause to fail our code is user input, connections and links which associated with our code. Suppose if we make a calculator app in which we can perform a calculation of two numbers and it works fine when we entered a valid numbers as an input, but when user enter invalid input like entered string instead of number then our code will fail and gives an error. By using error handling process in swift we can capture the errors thrown by an application and perform some custom operations to show a custom messages to the user based on our requirements. Generally, in swift errors are represented by value of types that follow the standards of Error protocol. The Error protocol tells the compiler that any data structure which compiles to the protocols can be used for error handling purpose. In swift, enumeration is the best suit for grouping an error conditions. We can throw an error when normal flow of application cannot continue or something unexpected is happing like as shown below. This is how we can represent and throw an errors in swift programming language based on our requirements. In swift, when application throws an error we need to write our custom piece of code to handle the exception errors like showing custom error message about failure or an alternative way to proceed further in application. In swift, we can identify the places of throwing an error in our code by using try or try? Keywords just before the code that calls the function, method or an initializer that can throw an error. Now we will see how to handle errors in application using different ways in swift programming language. In swift we can indicate a function, method or initializer can throw an error by adding throws keywords in the function declaration and after its parameters. A function which is marked with throws keyword is called a throwing function. Following is the example of defining a function with throws keyword to throw an exception when invalid parameters sent in function. This is how we can handle errors in application using throw keyword based on our requirements in swift programming language. In swift, we can handle errors using do…catch block of code. If any error occured in do code block it will check for matched catch block to determine which catch block of code can handle the error. Following is the syntax of defining a do…catch block to handle an errors in swift programming language. First, in do block the required function or method will be called by using try keyword. If any error occurred while executing required function or method it will go to catch blocks and executes matched catch block to execute based on the defined conditions. Following is the example of using do. This is how we can use do…catch blocks in swift programming language to handle errors based on our requirements. In swift, we can convert errors into optional value by using try keyword with question mark? If any error occurred while evaluating try? Following is the example of converting errors into optional values by using try? In swift programming language. UserDetails names: stud. If you observe above example we added a custom errors to enumeration and converting function exceptions to optional values using try with question? This is how we can convert exceptions into optional values in swift programming language based on our requirements. In some situation we feel better to thrown a runtime error instead of throwing method or function. In that cases we can use try!
Error handling is the process of responding to and recovering from error conditions in your program. Swift provides first-class support for throwing, catching, propagating, and manipulating recoverable errors at runtime. As an example, consider the task of reading and processing data from a file on disk. There are a number of ways this task can fail, including the file not existing at the specified path, the file not having read permissions, or the file not being encoded in a compatible format. For more information about this class, see Handling Cocoa Errors in Swift. In Swift, errors are represented by values of types that conform to the Error protocol. This empty protocol indicates that a type can be used for error handling. Swift enumerations are particularly well suited to modeling a group of related error conditions, with associated values allowing for additional information about the nature of an error to be communicated. You use a throw statement to throw an error. For example, the following code throws an error to indicate that five additional coins are needed by the vending machine:. When an error is thrown, some surrounding piece of code must be responsible for handling the error—for example, by correcting the problem, trying an alternative approach, or informing the user of the failure. There are four ways to handle errors in Swift. You can propagate the error from a function to the code that calls that function, handle the error using a do - catch statement, handle the error as an optional value, or assert that the error will not occur. Each approach is described in a section below. To identify these places in your code, write the try keyword—or the try? These keywords are described in the sections below. Error handling in Swift resembles exception handling in other languages, with the use of the trycatch and throw keywords. Unlike exception handling in many languages—including Objective-C—error handling in Swift does not involve unwinding the call stack, a process that can be computationally expensive. As such, the performance characteristics of a throw statement are comparable to those of a return statement. A function marked with throws is called a throwing function. Only throwing functions can propagate errors. Any errors thrown inside a nonthrowing function must be handled inside the function. In the example below, the VendingMachine class has a vend itemNamed: method that throws an appropriate VendingMachineError if the requested item is not available, is out of stock, or has a cost that exceeds the current deposited amount:. Because a throw statement immediately transfers program control, an item will be vended only if all of these requirements are met. Because the vend itemNamed: method propagates any errors it throws, any code that calls this method must either handle the errors—using a do - catch statement, try? For example, the buyFavoriteSnack person:vendingMachine: in the example below is also a throwing function, and any errors that the vend itemNamed: method throws will propagate up to the point where the buyFavoriteSnack person:vendingMachine: function is called. Throwing initializers can propagate errors in the same way as throwing functions. For example, the initializer for the PurchasedSnack structure in the listing below calls a throwing function as part of the initialization process, and it handles any errors that it encounters by propagating them to its caller. You use a do - catch statement to handle errors by running a block of code.