mirror of
https://github.com/samsonjs/SJSAssetExportSession.git
synced 2026-03-25 08:45:50 +00:00
Tweak the API, document export params, validate inputs better
This commit is contained in:
parent
a44627b971
commit
2fca0fb7fd
5 changed files with 214 additions and 151 deletions
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@ -16,6 +16,7 @@
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7BC5FC772C3B8C5A0090B757 /* SendableWrapper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BC5FC762C3B8C5A0090B757 /* SendableWrapper.swift */; };
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7BC5FC792C3B90F70090B757 /* AutoDestructingURL.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BC5FC782C3B90F70090B757 /* AutoDestructingURL.swift */; };
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7BC5FC7B2C3B93270090B757 /* AVFoundation+sending.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BC5FC7A2C3B93270090B757 /* AVFoundation+sending.swift */; };
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7BC5FC8A2C3BAA150090B757 /* ExportSession+Error.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7BC5FC892C3BAA150090B757 /* ExportSession+Error.swift */; };
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/* End PBXBuildFile section */
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/* Begin PBXContainerItemProxy section */
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@ -39,6 +40,7 @@
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7BC5FC762C3B8C5A0090B757 /* SendableWrapper.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SendableWrapper.swift; sourceTree = "<group>"; };
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7BC5FC782C3B90F70090B757 /* AutoDestructingURL.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AutoDestructingURL.swift; sourceTree = "<group>"; };
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7BC5FC7A2C3B93270090B757 /* AVFoundation+sending.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "AVFoundation+sending.swift"; sourceTree = "<group>"; };
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7BC5FC892C3BAA150090B757 /* ExportSession+Error.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ExportSession+Error.swift"; sourceTree = "<group>"; };
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/* End PBXFileReference section */
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/* Begin PBXFileSystemSynchronizedRootGroup section */
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@ -85,10 +87,11 @@
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7B9BC00B2C305D2C00C160C2 /* SJSAssetExportSession */ = {
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isa = PBXGroup;
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children = (
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7B9BC0272C30612C00C160C2 /* ExportSession.swift */,
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7BC5FC892C3BAA150090B757 /* ExportSession+Error.swift */,
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7B7AE3082C36615700DB7391 /* SampleWriter.swift */,
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7B9BC00C2C305D2C00C160C2 /* SJSAssetExportSession.h */,
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7B9BC00D2C305D2C00C160C2 /* SJSAssetExportSession.docc */,
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7B9BC0272C30612C00C160C2 /* ExportSession.swift */,
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7B7AE3082C36615700DB7391 /* SampleWriter.swift */,
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);
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path = SJSAssetExportSession;
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sourceTree = "<group>";
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@ -220,6 +223,7 @@
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7B7AE3092C36615700DB7391 /* SampleWriter.swift in Sources */,
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7B9BC0282C30612C00C160C2 /* ExportSession.swift in Sources */,
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7B9BC00E2C305D2C00C160C2 /* SJSAssetExportSession.docc in Sources */,
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7BC5FC8A2C3BAA150090B757 /* ExportSession+Error.swift in Sources */,
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);
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runOnlyForDeploymentPostprocessing = 0;
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};
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75
SJSAssetExportSession/ExportSession+Error.swift
Normal file
75
SJSAssetExportSession/ExportSession+Error.swift
Normal file
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@ -0,0 +1,75 @@
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//
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// ExportSession+Error.swift
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// SJSAssetExportSession
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//
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// Created by Sami Samhuri on 2024-07-07.
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//
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import Foundation
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extension ExportSession {
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public enum SetupFailureReason: String, Sendable, CustomStringConvertible {
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case audioSettingsEmpty
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case audioSettingsInvalid
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case cannotAddAudioInput
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case cannotAddAudioOutput
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case cannotAddVideoInput
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case cannotAddVideoOutput
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case videoSettingsEmpty
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case videoSettingsInvalid
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case videoTracksEmpty
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public var description: String {
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switch self {
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case .audioSettingsEmpty:
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"Must provide audio output settings"
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case .audioSettingsInvalid:
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"Invalid audio output settings"
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case .cannotAddAudioInput:
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"Can't add audio input to writer"
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case .cannotAddAudioOutput:
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"Can't add audio output to reader"
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case .cannotAddVideoInput:
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"Can't add video input to writer"
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case .cannotAddVideoOutput:
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"Can't add video output to reader"
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case .videoSettingsEmpty:
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"Must provide video output settings"
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case .videoSettingsInvalid:
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"Invalid video output settings"
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case .videoTracksEmpty:
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"No video track"
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}
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}
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}
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public enum Error: LocalizedError, Equatable {
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case setupFailure(SetupFailureReason)
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case readFailure((any Swift.Error)?)
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case writeFailure((any Swift.Error)?)
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public var errorDescription: String? {
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switch self {
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case let .setupFailure(reason):
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reason.description
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case let .readFailure(underlyingError):
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underlyingError?.localizedDescription ?? "Unknown read failure"
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case let .writeFailure(underlyingError):
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underlyingError?.localizedDescription ?? "Unknown write failure"
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}
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}
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public static func == (lhs: ExportSession.Error, rhs: ExportSession.Error) -> Bool {
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switch (lhs, rhs) {
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case let (.setupFailure(lhsReason), .setupFailure(rhsReason)):
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lhsReason == rhsReason
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case let (.readFailure(lhsError), .readFailure(rhsError)):
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String(describing: lhsError) == String(describing: rhsError)
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case let (.writeFailure(lhsError), .writeFailure(rhsError)):
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String(describing: lhsError) == String(describing: rhsError)
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default:
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false
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}
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}
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}
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}
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@ -8,72 +8,8 @@
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public import AVFoundation
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// @unchecked Sendable because progress properties are mutable, it's safe though.
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public final class ExportSession: @unchecked Sendable {
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public enum SetupFailureReason: String, Sendable, CustomStringConvertible {
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case audioSettingsEmpty
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case audioSettingsInvalid
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case cannotAddAudioInput
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case cannotAddAudioOutput
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case cannotAddVideoInput
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case cannotAddVideoOutput
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case videoSettingsEmpty
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case videoSettingsInvalid
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case videoTracksEmpty
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public var description: String {
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switch self {
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case .audioSettingsEmpty:
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"Must provide audio output settings"
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case .audioSettingsInvalid:
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"Invalid audio output settings"
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case .cannotAddAudioInput:
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"Can't add audio input to writer"
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case .cannotAddAudioOutput:
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"Can't add audio output to reader"
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case .cannotAddVideoInput:
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"Can't add video input to writer"
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case .cannotAddVideoOutput:
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"Can't add video output to reader"
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case .videoSettingsEmpty:
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"Must provide video output settings"
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case .videoSettingsInvalid:
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"Invalid video output settings"
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case .videoTracksEmpty:
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"No video track"
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}
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}
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}
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public enum Error: LocalizedError, Equatable {
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case setupFailure(SetupFailureReason)
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case readFailure((any Swift.Error)?)
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case writeFailure((any Swift.Error)?)
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public var errorDescription: String? {
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switch self {
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case let .setupFailure(reason):
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reason.description
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case let .readFailure(underlyingError):
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underlyingError?.localizedDescription ?? "Unknown read failure"
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case let .writeFailure(underlyingError):
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underlyingError?.localizedDescription ?? "Unknown write failure"
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}
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}
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public static func == (lhs: ExportSession.Error, rhs: ExportSession.Error) -> Bool {
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switch (lhs, rhs) {
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case let (.setupFailure(lhsReason), .setupFailure(rhsReason)):
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lhsReason == rhsReason
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case let (.readFailure(lhsError), .readFailure(rhsError)):
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String(describing: lhsError) == String(describing: rhsError)
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case let (.writeFailure(lhsError), .writeFailure(rhsError)):
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String(describing: lhsError) == String(describing: rhsError)
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default:
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false
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}
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}
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}
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// @unchecked Sendable because progress properties are mutable, it's safe though.
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public typealias ProgressStream = AsyncStream<Float>
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@ -87,6 +23,33 @@ public final class ExportSession: @unchecked Sendable {
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}
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}
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/**
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Exports the given asset using all of the other parameters to transform it in some way.
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- Parameters:
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- asset: The source asset to export. This can be any kind of `AVAsset` including subclasses such as `AVComposition`.
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- audioMix: An optional mix that can be used to manipulate the audio in some way.
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- audioOutputSettings: Audio settings using [audio settings keys from AVFoundation](https://developer.apple.com/documentation/avfoundation/audio_settings) and values must be suitable for consumption by Objective-C. Required keys are:
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- `AVFormatIDKey` with the typical value `kAudioFormatMPEG4AAC`
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- `AVNumberOfChannelsKey` with the typical value `NSNumber(value: 2)` or `AVChannelLayoutKey` with an instance of `AVAudioChannelLayout`
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- videoComposition: Used to manipulate the video in some way. This can be used to scale the video, apply filters, amongst other edits.
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- videoOutputSettings: Video settings using [video settings keys from AVFoundation](https://developer.apple.com/documentation/avfoundation/video_settings) and values must be suitable for consumption by Objective-C. Required keys are:
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- `AVVideoCodecKey` with the typical value `AVVideoCodecType.h264.rawValue` or `AVVideoCodecType.hevc.rawValue`
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- `AVVideoWidthKey` with an integer as an `NSNumber`
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- `AVVideoHeightKey` with an integer as an `NSNumber`
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- timeRange: Providing a time range exports a subset of the asset instead of the entire duration, which is the default behaviour.
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- optimizeForNetworkUse: Setting this value to `true` writes the output file in a form that enables a player to begin playing the media after downloading only a small portion of it. Defaults to `false`.
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- outputURL: The file URL where the exported video will be written.
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- fileType: The type of of video file to export. This will typically be one of `AVFileType.mp4`, `AVFileType.m4v`, or `AVFileType.mov`.
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*/
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public func export(
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asset: sending AVAsset,
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audioMix: sending AVAudioMix?,
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@ -100,11 +63,11 @@ public final class ExportSession: @unchecked Sendable {
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) async throws {
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let sampleWriter = try await SampleWriter(
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asset: asset,
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timeRange: timeRange ?? CMTimeRange(start: .zero, duration: .positiveInfinity),
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audioMix: audioMix,
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audioOutputSettings: audioOutputSettings,
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videoComposition: videoComposition,
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videoOutputSettings: videoOutputSettings,
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timeRange: timeRange,
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optimizeForNetworkUse: optimizeForNetworkUse,
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outputURL: outputURL,
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fileType: fileType
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@ -19,92 +19,66 @@ private extension AVAsset {
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actor SampleWriter {
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typealias Error = ExportSession.Error
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// MARK: - Actor executor
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private let queue = DispatchSerialQueue(
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label: "SJSAssetExportSession.SampleWriter",
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autoreleaseFrequency: .workItem,
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target: .global()
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)
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// Execute this actor on the same queue we use to request media data so we can use
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// `assumeIsolated` to ensure that we
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public nonisolated var unownedExecutor: UnownedSerialExecutor {
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queue.asUnownedSerialExecutor()
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}
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private let audioMix: AVAudioMix?
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private let audioOutputSettings: [String: (any Sendable)]
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private let videoComposition: AVVideoComposition?
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private let videoOutputSettings: [String: (any Sendable)]
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private let reader: AVAssetReader
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private let writer: AVAssetWriter
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private let duration: CMTime
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private let timeRange: CMTimeRange
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private var audioOutput: AVAssetReaderAudioMixOutput?
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private var audioInput: AVAssetWriterInput?
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private var videoOutput: AVAssetReaderVideoCompositionOutput?
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private var videoInput: AVAssetWriterInput?
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lazy var progressStream: AsyncStream<Float> = AsyncStream { continuation in
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progressContinuation = continuation
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}
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private var progressContinuation: AsyncStream<Float>.Continuation?
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private let audioMix: AVAudioMix?
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private let audioOutputSettings: [String: (any Sendable)]
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private let videoComposition: AVVideoComposition?
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private let videoOutputSettings: [String: (any Sendable)]
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private let reader: AVAssetReader
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private let writer: AVAssetWriter
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private let duration: CMTime
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private let timeRange: CMTimeRange
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private var audioOutput: AVAssetReaderAudioMixOutput?
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private var audioInput: AVAssetWriterInput?
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private var videoOutput: AVAssetReaderVideoCompositionOutput?
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private var videoInput: AVAssetWriterInput?
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init(
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asset: sending AVAsset,
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timeRange: CMTimeRange,
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audioMix: AVAudioMix?,
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audioOutputSettings: sending [String: (any Sendable)],
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videoComposition: AVVideoComposition,
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videoOutputSettings: sending [String: (any Sendable)],
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optimizeForNetworkUse: Bool,
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timeRange: CMTimeRange? = nil,
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optimizeForNetworkUse: Bool = false,
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outputURL: URL,
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fileType: AVFileType
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) async throws {
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guard !videoOutputSettings.isEmpty else {
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throw Error.setupFailure(.videoSettingsEmpty)
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}
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let duration =
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if timeRange.duration.isValid && !timeRange.duration.isPositiveInfinity {
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timeRange.duration
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} else {
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try await asset.load(.duration)
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}
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if let timeRange { timeRange.duration } else { try await asset.load(.duration) }
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let reader = try AVAssetReader(asset: asset)
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reader.timeRange = timeRange
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if let timeRange {
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reader.timeRange = timeRange
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}
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let writer = try AVAssetWriter(outputURL: outputURL, fileType: fileType)
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writer.shouldOptimizeForNetworkUse = optimizeForNetworkUse
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let audioTracks = try await asset.sendTracks(withMediaType: .audio)
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if !audioTracks.isEmpty {
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guard !audioOutputSettings.isEmpty else {
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throw Error.setupFailure(.audioSettingsEmpty)
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}
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guard writer.canApply(outputSettings: audioOutputSettings, forMediaType: .audio) else {
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throw Error.setupFailure(.audioSettingsInvalid)
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}
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}
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try Self.validateAudio(tracks: audioTracks, outputSettings: audioOutputSettings, writer: writer)
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let videoTracks = try await asset.sendTracks(withMediaType: .video)
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guard !videoTracks.isEmpty else {
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throw Error.setupFailure(.videoTracksEmpty)
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}
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guard writer.canApply(outputSettings: videoOutputSettings, forMediaType: .video) else {
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throw Error.setupFailure(.videoSettingsInvalid)
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}
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try Self.validateVideo(tracks: videoTracks, outputSettings: videoOutputSettings, writer: writer)
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Self.warnAboutMismatchedVideoDimensions(
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renderSize: videoComposition.renderSize,
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settings: videoOutputSettings
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)
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self.audioMix = audioMix
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self.audioOutputSettings = audioOutputSettings
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@ -113,7 +87,7 @@ actor SampleWriter {
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self.reader = reader
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self.writer = writer
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self.duration = duration
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self.timeRange = timeRange
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self.timeRange = timeRange ?? CMTimeRange(start: .zero, duration: duration)
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try setUpAudio(audioTracks: audioTracks)
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try setUpVideo(videoTracks: videoTracks)
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@ -156,6 +130,8 @@ actor SampleWriter {
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await Task.yield()
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}
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// MARK: - Setup
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private func setUpAudio(audioTracks: [AVAssetTrack]) throws {
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guard !audioTracks.isEmpty else { return }
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@ -201,34 +177,10 @@ actor SampleWriter {
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self.videoInput = videoInput
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}
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private func writeReadySamples(output: AVAssetReaderOutput, input: AVAssetWriterInput) -> Bool {
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while input.isReadyForMoreMediaData {
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guard reader.status == .reading && writer.status == .writing,
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let sampleBuffer = output.copyNextSampleBuffer() else {
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input.markAsFinished()
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log.debug("Finished encoding ready audio samples from \(output)")
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return false
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}
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let samplePresentationTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer) - timeRange.start
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let progress = Float(samplePresentationTime.seconds / duration.seconds)
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progressContinuation?.yield(progress)
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guard input.append(sampleBuffer) else {
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log.error("""
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Failed to append audio sample buffer \(String(describing: sampleBuffer)) to
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input \(input.debugDescription)
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""")
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return false
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}
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}
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// Everything was appended successfully, return true indicating there's more to do.
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log.debug("Completed encoding ready audio samples, more to come...")
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return true
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}
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// MARK: - Encoding
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private func encodeAudioTracks() async {
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// Don't do anything when we have no audio to encode.
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guard audioInput != nil, audioOutput != nil else { return }
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return await withCheckedContinuation { continuation in
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@ -255,4 +207,73 @@ actor SampleWriter {
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}
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}
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}
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private func writeReadySamples(output: AVAssetReaderOutput, input: AVAssetWriterInput) -> Bool {
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while input.isReadyForMoreMediaData {
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guard reader.status == .reading && writer.status == .writing,
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let sampleBuffer = output.copyNextSampleBuffer() else {
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input.markAsFinished()
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return false
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}
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// Only yield progress values for video. Audio is insignificant in comparison.
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if output == videoOutput {
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let samplePresentationTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer) - timeRange.start
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let progress = Float(samplePresentationTime.seconds / duration.seconds)
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progressContinuation?.yield(progress)
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}
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guard input.append(sampleBuffer) else {
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log.error("""
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Failed to append audio sample buffer \(String(describing: sampleBuffer)) to
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input \(input.debugDescription)
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""")
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return false
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}
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}
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// Everything was appended successfully, return true indicating there's more to do.
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return true
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}
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// MARK: Input validation
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private static func validateAudio(
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tracks: [AVAssetTrack],
|
||||
outputSettings: [String: any Sendable],
|
||||
writer: AVAssetWriter
|
||||
) throws {
|
||||
guard !tracks.isEmpty else { return } // Audio is optional so this isn't a failure.
|
||||
guard !outputSettings.isEmpty else { throw Error.setupFailure(.audioSettingsEmpty) }
|
||||
guard writer.canApply(outputSettings: outputSettings, forMediaType: .audio) else {
|
||||
throw Error.setupFailure(.audioSettingsInvalid)
|
||||
}
|
||||
}
|
||||
|
||||
private static func validateVideo(
|
||||
tracks: [AVAssetTrack],
|
||||
outputSettings: [String: any Sendable],
|
||||
writer: AVAssetWriter
|
||||
) throws {
|
||||
guard !tracks.isEmpty else { throw Error.setupFailure(.videoTracksEmpty) }
|
||||
guard !outputSettings.isEmpty else { throw Error.setupFailure(.videoSettingsEmpty) }
|
||||
guard writer.canApply(outputSettings: outputSettings, forMediaType: .video) else {
|
||||
throw Error.setupFailure(.videoSettingsInvalid)
|
||||
}
|
||||
}
|
||||
|
||||
private static func warnAboutMismatchedVideoDimensions(
|
||||
renderSize: CGSize,
|
||||
settings: [String: any Sendable]
|
||||
) {
|
||||
guard let settingsWidth = (settings[AVVideoWidthKey] as? NSNumber)?.intValue,
|
||||
let settingsHeight = (settings[AVVideoHeightKey] as? NSNumber)?.intValue
|
||||
else { return }
|
||||
|
||||
let renderWidth = Int(renderSize.width)
|
||||
let renderHeight = Int(renderSize.height)
|
||||
if renderWidth != settingsWidth || renderHeight != settingsHeight {
|
||||
log.warning("Video composition's render size (\(renderWidth)ｘ\(renderHeight)) will be overriden by video output settings (\(settingsWidth)ｘ\(settingsHeight))")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
import Foundation
|
||||
import OSLog
|
||||
|
||||
private let log = Logger(OSLog(subsystem: "SJSAssetExportSessionTests", category: "AutoDestructingURL"))
|
||||
private let log = Logger(subsystem: "SJSAssetExportSessionTests", category: "AutoDestructingURL")
|
||||
|
||||
/// Wraps a URL and deletes it when this instance is deallocated. Failures to delete the file are logged.
|
||||
final class AutoDestructingURL: Hashable, Sendable {
|
||||
|
|
|
|||
Loading…
Reference in a new issue