iOS端QML应用集成AVPlayer显示视频及DRM播放技术咨询

Hey there! Let's break down your problem step by step since you're working on DRM video playback for an iOS QML app and stuck on getting AVPlayer's video frame to render in QML, plus wondering if Qt MediaPlayer can replace your custom ViewRightKeyLoaderDelegate logic.

1. Can I display AVPlayer's video in QML? #

Absolutely—you just need to bridge the iOS native AVPlayerLayer with Qt's QML rendering system. Since you're new to Objective-C/Qt integration, here's a straightforward approach:

Step 1: Create a custom QQuickItem wrapper for AVPlayer #

We'll build an Objective-C class that inherits from QQuickItem, acting as a bridge between AVPlayer and QML. This class manages an AVPlayerLayer and attaches it to Qt's underlying iOS view.

// AVPlayerQuickItem.h
#import <QtQuick/QQuickItem>
#import <AVFoundation/AVFoundation.h>

@interface AVPlayerQuickItem : QQuickItem
@property (nonatomic, strong) AVPlayer *player;
@end

// AVPlayerQuickItem.m
#import "AVPlayerQuickItem.h"
#import <QtGui/QWindow>
#import <UIKit/UIKit.h>

@implementation AVPlayerQuickItem {
    AVPlayerLayer *_playerLayer;
}

- (void)setPlayer:(AVPlayer *)player {
    _player = player;
    if (!_playerLayer) {
        // Initialize player layer with your existing AVPlayer
        _playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
        _playerLayer.frame = self.bounds;
        _playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
        
        // Get Qt's underlying iOS UIView and add the player layer to it
        UIView *qtContentView = [(UIView *)self.window->winId() contentView];
        [qtContentView.layer addSublayer:_playerLayer];
    } else {
        // Update the player if it changes later
        _playerLayer.player = player;
    }
}

- (void)geometryChanged:(const QRectF &)newGeometry
              oldGeometry:(const QRectF &)oldGeometry {
    [super geometryChanged:newGeometry oldGeometry:oldGeometry];
    // Keep the player layer sized to match the QML item's dimensions
    if (_playerLayer) {
        _playerLayer.frame = CGRectMake(newGeometry.x(), newGeometry.y(), newGeometry.width(), newGeometry.height());
    }
}

@end

Step 2: Register the custom item with QML #

In your Qt main.cpp, register the Objective-C class so it's usable in QML:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtQml>
#import "AVPlayerQuickItem.h"

int main(int argc, char *argv[]) {
    QGuiApplication app(argc, argv);

    // Register the custom item under a QML module
    qmlRegisterType<AVPlayerQuickItem>("iOSAVPlayer", 1, 0, "AVPlayerItem");

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

Step 3: Use the item in QML #

Add the custom AVPlayerItem to your QML file and attach your existing AVPlayer instance to it:

import QtQuick 2.15
import iOSAVPlayer 1.0

Window {
    width: 640
    height: 480
    visible: true

    AVPlayerItem {
        id: avPlayerView
        width: parent.width
        height: parent.height
        // Pass your AVPlayer instance here from C++/Objective-C
        // or set it via an exposed property/method
    }
}

Key Notes:

• Handle memory management carefully (avoid retain cycles between Qt and iOS objects—use __weak references if needed).
• If you need to pass the AVPlayer from QML to the native layer, expose a Q_INVOKABLE method or use a property with a custom setter.

2. Can Qt MediaPlayer replace ViewRightKeyLoaderDelegate functionality? #

Qt MediaPlayer on iOS uses AVPlayer under the hood, so replicating your DRM logic is possible—but it depends on how custom your ViewRightKeyLoaderDelegate is:

For standard FairPlay DRM: #

Qt 5.15+ has built-in support for FairPlay. Configure DRM when setting media using QMediaResource and its drmConfiguration property:

QMediaResource resource(QUrl("your-stream-url"));
QVariantMap drmConfig;
drmConfig["licenseUrl"] = "your-fairplay-license-url";
resource.setDrmConfiguration(drmConfig);

QMediaPlayer *player = new QMediaPlayer;
player->setMedia(QMediaContent(resource));

For custom DRM workflows (like your ViewRightKeyLoaderDelegate): #

If your delegate handles custom license fetching, authentication, or key processing, you'll need to extend Qt's media backend. Options include:

• Write a custom QMediaServiceProvider: Override how Qt handles DRM license requests, integrating your existing ViewRightKeyLoaderDelegate logic.
• Hybrid approach: Use Qt MediaPlayer for playback, but handle DRM license acquisition natively (via your existing delegate) and pass the license data to Qt's media player when ready.

The hybrid approach is often simpler if you already have working DRM code with AVPlayer—keep using your ViewRightKeyLoaderDelegate to fetch licenses, then pass the resulting key data to Qt MediaPlayer's DRM configuration.

Final Thoughts #

• If you want to reuse your existing AVPlayer/DRM code, bridging AVPlayer to QML via a custom QQuickItem is the most direct path.
• If you prefer a pure Qt/QML workflow, Qt MediaPlayer can handle standard DRM, but may require extra work for custom license loading logic.

内容的提问来源于stack exchange，提问作者light01