### Install NextLevelSessionExporter

Source: https://nextlevel.github.io/NextLevelSessionExporter/index.html

Instructions for installing the NextLevelSessionExporter library using various package managers.

```bash
# CocoaPods

pod "NextLevelSessionExporter", "~> 0.4.0"
```

```bash
# Carthage

github "nextlevel/NextLevelSessionExporter" ~> 0.4.0
```

```swift
# Swift PM

let package = Package(
    dependencies: [
        .Package(url: "https://github.com/nextlevel/NextLevelSessionExporter", majorVersion: 0)
    ]
)
```

--------------------------------

### Initiate NextLevel Session Export

Source: https://nextlevel.github.io/NextLevelSessionExporter/Extensions/AVAsset.html

Use this method to start exporting an AVAsset. Configure video and audio output settings, and provide handlers for progress and completion.

```swift
public func nextlevel_export(outputFileType: AVFileType? = AVFileType.mp4,
                               outputURL: URL,
                               metadata: [AVMetadataItem]? = nil,
                               videoInputConfiguration: [String : Any]? = nil,
                               videoOutputConfiguration: [String : Any],
                               audioOutputConfiguration: [String : Any],
                               progressHandler: NextLevelSessionExporter.ProgressHandler? = nil,
                               completionHandler: NextLevelSessionExporter.CompletionHandler? = nil)
```

--------------------------------

### Export Media with AVAsset Extension

Source: https://nextlevel.github.io/NextLevelSessionExporter/index.html

Example demonstrating how to export media using the AVAsset extension provided by NextLevelSessionExporter. This method simplifies the export process by directly operating on an AVAsset.

```swift
let tmpURL = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
    .appendingPathComponent(ProcessInfo().globallyUniqueString)
    .appendingPathExtension("mp4")
exporter.outputURL = tmpURL

let compressionDict: [String: Any] = [
    AVVideoAverageBitRateKey: NSNumber(integerLiteral: 6000000),
    AVVideoProfileLevelKey: AVVideoProfileLevelH264HighAutoLevel as String,
]
let videoOutputConfig = [
    AVVideoCodecKey: AVVideoCodec.h264,
    AVVideoWidthKey: NSNumber(integerLiteral: 1920),
    AVVideoHeightKey: NSNumber(integerLiteral: 1080),
    AVVideoScalingModeKey: AVVideoScalingModeResizeAspectFill,
    AVVideoCompressionPropertiesKey: compressionDict
]
let audioOutputConfig = [
    AVFormatIDKey: kAudioFormatMPEG4AAC,
    AVEncoderBitRateKey: NSNumber(integerLiteral: 128000),
    AVNumberOfChannelsKey: NSNumber(integerLiteral: 2),
    AVSampleRateKey: NSNumber(value: Float(44100))
]

let asset = AVAsset(url: Bundle.main.url(forResource: "TestVideo", withExtension: "mov")!)
asset.nextlevel_export(outputURL: tmpURL, videoOutputConfiguration: videoOutputConfig, audioOutputConfiguration: audioOutputConfig)
```

--------------------------------

### Export Media with NextLevelSessionExporter Instance

Source: https://nextlevel.github.io/NextLevelSessionExporter/index.html

Example showing how to use an instance of NextLevelSessionExporter for media export. This provides more control over the export process, including progress and completion handlers.

```swift
let exporter = NextLevelSessionExporter(withAsset: asset)
exporter.outputFileType = AVFileType.mp4
let tmpURL = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
    .appendingPathComponent(ProcessInfo().globallyUniqueString)
    .appendingPathExtension("mp4")
exporter.outputURL = tmpURL

let compressionDict: [String: Any] = [
    AVVideoAverageBitRateKey: NSNumber(integerLiteral: 6000000),
    AVVideoProfileLevelKey: AVVideoProfileLevelH264HighAutoLevel as String,
]
exporter.videoOutputConfiguration = [
    AVVideoCodecKey: AVVideoCodec.h264,
    AVVideoWidthKey: NSNumber(integerLiteral: 1920),
    AVVideoHeightKey: NSNumber(integerLiteral: 1080),
    AVVideoScalingModeKey: AVVideoScalingModeResizeAspectFill,
    AVVideoCompressionPropertiesKey: compressionDict
]
exporter.audioOutputConfiguration = [
    AVFormatIDKey: kAudioFormatMPEG4AAC,
    AVEncoderBitRateKey: NSNumber(integerLiteral: 128000),
    AVNumberOfChannelsKey: NSNumber(integerLiteral: 2),
    AVSampleRateKey: NSNumber(value: Float(44100))
]

exporter.export(progressHandler: { (progress) in
    print(progress)
}, completionHandler: { result in
    switch result {
    case .success(let status):
        switch status {
        case .completed:
            print("NextLevelSessionExporter, export completed, \(exporter.outputURL?.description ?? "")")
            break
        default:
            print("NextLevelSessionExporter, did not complete")
            break
        }
        break
    case .failure(let error):
        print("NextLevelSessionExporter, failed to export \(error)")
        break
    }
})
```

--------------------------------

### NextLevelSessionExporterError Setup Failure Case

Source: https://nextlevel.github.io/NextLevelSessionExporter/Enums/NextLevelSessionExporterError.html

Represents an error that occurs during the initial setup phase of the session exporter.

```swift
case setupFailure
```

--------------------------------

### Initializer with Asset

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Initializes a new export session with a specified AVAsset.

```swift
public convenience init(withAsset asset: AVAsset)
```

--------------------------------

### Export Method

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Initiates the media export process. It can optionally accept handlers for rendering frames, reporting progress, and completion.

```swift
public func export(renderHandler: RenderHandler? = nil, progressHandler: ProgressHandler? = nil, completionHandler: CompletionHandler? = nil)
```

--------------------------------

### VideoInputConfiguration Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

A dictionary for configuring video input, using keys defined in CoreVideo.

```swift
public var videoInputConfiguration: [String : Any]?
```

--------------------------------

### AudioOutputConfiguration Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

A dictionary for configuring audio output settings, using keys defined in AVFoundation.

```swift
public var audioOutputConfiguration: [String : Any]?
```

--------------------------------

### VideoOutputConfiguration Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

A dictionary for configuring video output settings, using keys defined in AVFoundation.

```swift
public var videoOutputConfiguration: [String : Any]?
```

--------------------------------

### Asset Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

The input AVAsset for the export session. This should be provided during initialization.

```swift
public var asset: AVAsset?
```

--------------------------------

### OutputURL Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Specifies the file location for the exported media.

```swift
public var outputURL: URL?
```

--------------------------------

### NextLevelSessionExporter Initializers

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Details the initializers for creating a NextLevelSessionExporter instance, including initializing with an asset or a default initializer.

```APIDOC
## NextLevelSessionExporter Initializers

### init(withAsset:)
Initializes a session with an asset to export.

#### Parameters
- **asset** (`AVAsset`) - The asset to export.

### init()
Undocumented initializer.

- **Declaration**: `public override init()`
```

--------------------------------

### VideoComposition Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Allows for video composition and setting parameters for the export session.

```swift
public var videoComposition: AVVideoComposition?
```

--------------------------------

### nextlevel_export

Source: https://nextlevel.github.io/NextLevelSessionExporter/Extensions/AVAsset.html

Initiates a NextLevelSessionExport on the asset. This method allows for custom configuration of video and audio output, metadata, and progress/completion handling.

```APIDOC
## nextlevel_export

### Description
Initiates a NextLevelSessionExport on the asset. This method allows for custom configuration of video and audio output, metadata, and progress/completion handling.

### Method
public func

### Endpoint
AVAsset

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **outputFileType** (AVFileType? = AVFileType.mp4) - type of resulting file to create
- **outputURL** (URL) - location of resulting file
- **metadata** ([AVMetadataItem]? = nil) - data to embed in the result
- **videoInputConfiguration** ([String : Any]? = nil) - video input configuration
- **videoOutputConfiguration** ([String : Any]) - video output configuration
- **audioOutputConfiguration** ([String : Any]) - audio output configuration
- **progressHandler** (NextLevelSessionExporter.ProgressHandler? = nil) - progress fraction handler
- **completionHandler** (NextLevelSessionExporter.CompletionHandler? = nil) - completion handler

### Request Example
```swift
// Example usage (assuming necessary setup for AVAsset and configurations)
let asset: AVAsset = ... // Your AVAsset instance
let outputURL: URL = ... // Your output URL
let videoConfig: [String: Any] = ... // Your video output configuration
let audioConfig: [String: Any] = ... // Your audio output configuration

asset.nextlevel_export(outputURL: outputURL, videoOutputConfiguration: videoConfig, audioOutputConfiguration: audioConfig) { progress in
    // Handle progress updates
    print("Export progress: \(progress * 100)%")
} completionHandler: { result, error in
    if let error = error {
        print("Export failed: \(error.localizedDescription)")
    } else {
        print("Export completed successfully.")
    }
}
```

### Response
#### Success Response
This method does not return a value directly upon completion. Success or failure is communicated via the `completionHandler`.
```

--------------------------------

### Metadata Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

An array of AVMetadataItem objects to be included in the exported media.

```swift
public var metadata: [AVMetadataItem]?
```

--------------------------------

### AudioMix Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Enables audio mixing and setting parameters for the export session.

```swift
public var audioMix: AVAudioMix?
```

--------------------------------

### Progress Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Indicates the progress of the export session as a float value between 0 and 1.

```swift
public var progress: Float { get }
```

--------------------------------

### Default Initializer

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

The default initializer for the NextLevelSessionExporter class.

```swift
public override init()
```

--------------------------------

### ExpectsMediaDataInRealTime Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Indicates whether the export session should expect media data in real time. Useful for live streaming scenarios.

```swift
public var expectsMediaDataInRealTime: Bool
```

--------------------------------

### OutputFileType Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Defines the type of the output file using a UTI string.

```swift
public var outputFileType: AVFileType?
```

--------------------------------

### NextLevelSessionExporter Export Methods

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Covers the methods for initiating, managing, and canceling export operations, including completion and progress handlers.

```APIDOC
## NextLevelSessionExporter Export Methods

### export(renderHandler:progressHandler:completionHandler:)
Initiates an export session.

Throws: Failure indication thrown when an error has occurred during export.

#### Parameters
- **renderHandler** (`RenderHandler?`): Handler for frame processing.
- **progressHandler** (`ProgressHandler?`): Handler called with the export progress.
- **completionHandler** (`CompletionHandler?`): Handler called when an export session completes.

### cancelExport()
Cancels any export in progress.
```

--------------------------------

### NextLevelSessionExporter Properties

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Provides details on the configurable properties of the NextLevelSessionExporter, including input asset, video composition, output settings, and more.

```APIDOC
## NextLevelSessionExporter Properties

### asset
Input asset for export, provided when initialized.

- **Type**: `AVAsset?`

### videoComposition
Enables video composition and parameters for the session.

- **Type**: `AVVideoComposition?`

### audioMix
Enables audio mixing and parameters for the session.

- **Type**: `AVAudioMix?`

### outputURL
Output file location for the session.

- **Type**: `URL?`

### outputFileType
Output file type. UTI string defined in `AVMediaFormat.h`.

- **Type**: `AVFileType?`

### timeRange
Time range or limit of an export from `kCMTimeZero` to `kCMTimePositiveInfinity`.

- **Type**: `CMTimeRange`

### expectsMediaDataInRealTime
Indicates if an export session should expect media data in real time.

- **Type**: `Bool`

### optimizeForNetworkUse
Indicates if an export should be optimized for network use.

- **Type**: `Bool`

### metadata
Metadata to be added to an export.

- **Type**: `[AVMetadataItem]?`

### videoInputConfiguration
Video input configuration dictionary, using keys defined in `<CoreVideo/CVPixelBuffer.h>`.

- **Type**: `[String : Any]?`

### videoOutputConfiguration
Video output configuration dictionary, using keys defined in `<AVFoundation/AVVideoSettings.h>`.

- **Type**: `[String : Any]?`

### audioOutputConfiguration
Audio output configuration dictionary, using keys defined in `<AVFoundation/AVAudioSettings.h>`.

- **Type**: `[String : Any]?`

### status
Export session status state.

- **Type**: `AVAssetExportSession.Status { get }`

### progress
Session exporting progress from 0 to 1.

- **Type**: `Float { get }`
```

--------------------------------

### TimeRange Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Sets the time range for the export, limiting the duration of the exported media.

```swift
public var timeRange: CMTimeRange
```

--------------------------------

### NextLevelSessionExporterError Description Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Enums/NextLevelSessionExporterError.html

Provides a human-readable string representation of the error.

```swift
public var description: String { get }
```

--------------------------------

### AVAsset Declaration

Source: https://nextlevel.github.io/NextLevelSessionExporter/Extensions.html

Shows the declaration of the AVAsset class in Swift. This is a fundamental class for working with media assets.

```swift
class AVAsset : NSObject, NSCopying, AVAsynchronousKeyValueLoading
```

--------------------------------

### OptimizeForNetworkUse Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Determines if the export should be optimized for network streaming, potentially affecting file structure and metadata.

```swift
public var optimizeForNetworkUse: Bool
```

--------------------------------

### Status Property

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Provides the current status of the export session, such as 'exporting', 'completed', or 'failed'.

```swift
public var status: AVAssetExportSession.Status { get }
```

--------------------------------

### RenderHandler Type

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Defines the type for a render handler, used for frame-by-frame processing during export.

```swift
public typealias RenderHandler = (_ renderFrame: CVPixelBuffer, _ presentationTime: CMTime, _ resultingBuffer: CVPixelBuffer) -> Void
```

--------------------------------

### Declare NextLevelSessionExporterErrorDomain

Source: https://nextlevel.github.io/NextLevelSessionExporter/Global%20Variables.html

Declares the global constant `NextLevelSessionExporterErrorDomain` which represents the error domain for session export operations.

```swift
public let NextLevelSessionExporterErrorDomain: String
```

--------------------------------

### NextLevelSessionExporter Class

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes.html

The NextLevelSessionExporter class is responsible for exporting and transcoding media. It is declared as an open class inheriting from NSObject.

```APIDOC
## NextLevelSessionExporter

### Description
Provides functionality for exporting and transcoding media assets. This class is designed to be used directly by developers to manage media output.

### Declaration
Swift
```swift
open class NextLevelSessionExporter : NSObject
```
```

--------------------------------

### CompletionHandler Type

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Defines the type for the completion handler, which is called when an export finishes. It returns a Result with either the final status or an Error.

```swift
public typealias CompletionHandler = (Swift.Result<AVAssetExportSession.Status, Error>) -> Void
```

--------------------------------

### ProgressHandler Type

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Defines the type for a progress handler, which is called periodically to report the export progress.

```swift
public typealias ProgressHandler = (_ progress: Float) -> Void
```

--------------------------------

### NextLevelSessionExporterError Writing Failure Case

Source: https://nextlevel.github.io/NextLevelSessionExporter/Enums/NextLevelSessionExporterError.html

Represents an error that occurs while writing data during the session export process.

```swift
case writingFailure
```

--------------------------------

### NextLevelSessionExporterError Reading Failure Case

Source: https://nextlevel.github.io/NextLevelSessionExporter/Enums/NextLevelSessionExporterError.html

Represents an error that occurs while reading data during the session export process.

```swift
case readingFailure
```

--------------------------------

### NextLevelSessionExporterError Cancelled Case

Source: https://nextlevel.github.io/NextLevelSessionExporter/Enums/NextLevelSessionExporterError.html

Represents an error indicating that the session export process was cancelled.

```swift
case cancelled
```

--------------------------------

### CancelExport Method

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes/NextLevelSessionExporter.html

Stops any ongoing export operation immediately.

```swift
public func cancelExport()
```

--------------------------------

### NextLevelSessionExporter Class Declaration

Source: https://nextlevel.github.io/NextLevelSessionExporter/Classes.html

Declaration of the NextLevelSessionExporter class. This class is available globally and inherits from NSObject.

```swift
open class NextLevelSessionExporter : NSObject
```

--------------------------------

### NextLevelSessionExporterError Enum Declaration

Source: https://nextlevel.github.io/NextLevelSessionExporter/Enums.html

Declaration of the NextLevelSessionExporterError enumeration, which conforms to Error and CustomStringConvertible protocols.

```swift
public enum NextLevelSessionExporterError : Error, CustomStringConvertible
```

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