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使用 React Native 实现流畅的视频流

王林

发布： 2024-08-24 11:35:02

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Smooth Video Streaming with React Native

使用 React Native Video 构建流畅的视频流体验

在当今以移动为中心的世界中，视频流是许多应用程序的核心功能。无论是视频共享平台、教育应用程序还是多媒体丰富的社交网络，提供无缝的视频体验都是至关重要的。 React Native 是一种用于构建跨平台移动应用程序的流行框架，通过 React-native-video 库可以轻松集成视频流。

在本博客中，我们将逐步完成安装、配置和使用 React-native-video 的步骤，以便在 React Native 应用程序中创建流畅的视频流体验。

1. 安装

首先，您需要在 React Native 项目中安装react-native-video 库。

第 1 步：安装软件包

首先，使用npm或yarn安装库：

npm install react-native-video react-native-video-cache

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或

yarn add react-native-video react-native-video-cache

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对于 iOS，您可能需要安装必要的 pod：

cd ios
pod install
cd ..

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第 2 步：针对 iOS/Android 的其他本机设置

一）安卓：

i) android/build.gradle

buildscript {
  ext {
    // Enable IMA (Interactive Media Ads) integration with ExoPlayer
    useExoplayerIMA = true

    // Enable support for RTSP (Real-Time Streaming Protocol) with ExoPlayer
    useExoplayerRtsp = true

    // Enable support for Smooth Streaming with ExoPlayer
    useExoplayerSmoothStreaming = true

    // Enable support for DASH (Dynamic Adaptive Streaming over HTTP) with ExoPlayer
    useExoplayerDash = true

    // Enable support for HLS (HTTP Live Streaming) with ExoPlayer
    useExoplayerHls = true
  }
}

allprojects {
    repositories {
        mavenLocal()
        google()
        jcenter()
         maven {
            url "$rootDir/../node_modules/react-native-video-cache/android/libs"
        }
    }
}

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此配置在 ExoPlayer 中启用各种流媒体协议（IMA、RTSP、Smooth Streaming、DASH、HLS），并设置存储库以包括本地、Google、JCenter 和用于react-native-video-的自定义 Maven 存储库缓存。
启用的每个功能都会增加 APK 的大小，因此仅启用您需要的功能。默认启用的功能有：useExoplayerSmoothStreaming、useExoplayerDash、useExoplayerHls

ii) AndroidManifest.xml

    <application
      ...
      android:largeHeap="true" 
      android:hardwareAccelerated="true">

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这种组合确保应用程序有足够的内存来处理大型数据集（通过largeHeap），并可以高效地渲染图形（通过硬件加速），从而带来更流畅、更稳定的用户体验。但是，两者的使用都应考虑应用程序的性能及其功能的特定需求。

b) iOS：

i) 在 ios/your_app/AppDelegate.mm 里面 didFinishLaunchingWithOptions 添加：

#import <AVFoundation/AVFoundation.h> 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  self.moduleName = @"your_app";

  // --- You can add your custom initial props in the dictionary below.
  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
  // --- They will be passed down to the ViewController used by React Native.

  self.initialProps = @{};
  return [super application:application didFinishLaunchingWithOptions:launchOptions];
}

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即使应用程序处于后台或静音模式，也确保音频继续播放

ii) ios/Podfile:

...
# ENABLE THIS FOR CACHEING THE VIDEOS 
platform :ios, min_ios_version_supported
prepare_react_native_project!
# -- ENABLE THIS FOR CACHEING THE VIDEOS 
$RNVideoUseVideoCaching=true

...

target 'your_app' do

  config = use_native_modules!
  # ENABLE THIS FOR CACHEING THE VIDEOS 
  pod 'SPTPersistentCache', :modular_headers => true;
  pod 'DVAssetLoaderDelegate', :modular_headers => true;

...

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此配置通过添加处理缓存和资源加载的特定 CocoaPod（SPTPercientCache 和 DVAssetLoaderDelegate）来在 iOS 项目中启用视频缓存。标志 $RNVideoUseVideoCaching=true 表示项目应该使用这些缓存功能。此设置通过减少重新获取视频文件的需要来提高视频播放的性能。

2、使用方法：

import Video from 'react-native-video';
import convertToProxyURL from 'react-native-video-cache';

          <Video
  // Display a thumbnail image while the video is loading
  poster={item.thumbUri}

  // Specifies how the thumbnail should be resized to cover the entire video area
  posterResizeMode="cover"

  // Sets the video source URI if the video is visible; otherwise, it avoids loading the video
  source={
    isVisible
      ? { uri: convertToProxyURL(item.videoUri) } // Converts the video URL to a proxy URL if visible
      : undefined // Avoid loading the video if not visible
  }

  // Configures buffer settings to manage video loading and playback
  bufferConfig={{
    minBufferMs: 2500, // Minimum buffer before playback starts
    maxBufferMs: 3000, // Maximum buffer allowed
    bufferForPlaybackMs: 2500, // Buffer required to start playback
    bufferForPlaybackAfterRebufferMs: 2500, // Buffer required after rebuffering
  }}

  // Ignores the silent switch on the device, allowing the video to play with sound even if the device is on silent mode
  ignoreSilentSwitch={'ignore'}

  // Prevents the video from playing when the app is inactive or in the background
  playWhenInactive={false}
  playInBackground={false}

  // Disables the use of TextureView, which can optimize performance but might limit certain effects
  useTextureView={false}

  // Hides the default media controls provided by the video player
  controls={false}

  // Disables focus on the video, which is useful for accessibility and UI focus management
  disableFocus={true}

  // Applies the defined styles to the video container
  style={styles.videoContainer}

  // Pauses the video based on the isPaused state
  paused={isPaused}

  // Repeats the video playback indefinitely
  repeat={true}

  // Hides the shutter view (a black screen that appears when the video is loading or paused)
  hideShutterView

  // Sets the minimum number of retry attempts when the video fails to load
  minLoadRetryCount={5}

  // Ensures the video maintains the correct aspect ratio by covering the entire view area
  resizeMode="cover"

  // Sets the shutter color to transparent, so the shutter view is invisible
  shutterColor="transparent"

  // Callback function that is triggered when the video is ready for display
  onReadyForDisplay={handleVideoLoad}
/>

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