video_decode_plugin/lib/video_decode_plugin.dart

import 'dart:async';
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

import 'video_decode_plugin_platform_interface.dart';

/// 视频解码器配置
class VideoDecoderConfig {
  /// 视频宽度
  final int width;

  /// 视频高度
  final int height;

  /// 编码类型，默认h264
  final String codecType;

  /// 构造函数
  VideoDecoderConfig({
    required this.width,
    required this.height,
    this.codecType = 'h264',
  });

  /// 转换为Map
  Map<String, dynamic> toMap() {
    return {
      'width': width,
      'height': height,
      'codecType': codecType,
    };
  }
}

/// 视频解码插件主类
class VideoDecodePlugin {
  static const MethodChannel _channel = MethodChannel('video_decode_plugin');

  static int? _textureId;

  /// 初始化解码器
  static Future<int?> initDecoder(VideoDecoderConfig config) async {
    final textureId = await _channel.invokeMethod<int>('initDecoder', config.toMap());
    _textureId = textureId;
    return textureId;
  }

  /// 解码视频帧（参数扩展）
  static Future<bool> decodeFrame({
    required Uint8List frameData,
    required int frameType, // 0=I帧, 1=P帧
    required int timestamp, // 毫秒或微秒
    required int frameSeq,  // 帧序号
    int? refIFrameSeq,      // P帧时可选
  }) async {
    if (_textureId == null) return false;
    final params = {
      'textureId': _textureId,
      'frameData': frameData,
      'frameType': frameType,
      'timestamp': timestamp,
      'frameSeq': frameSeq,
      if (refIFrameSeq != null) 'refIFrameSeq': refIFrameSeq,
    };
    final result = await _channel.invokeMethod<bool>('decodeFrame', params);
    return result ?? false;
  }

  /// 释放解码器资源
  static Future<bool> releaseDecoder() async {
    if (_textureId == null) return true;
    final result = await _channel.invokeMethod<bool>('releaseDecoder', {
      'textureId': _textureId,
    });
    _textureId = null;
    return result ?? false;
  }

  /// 获取平台版本
  static Future<String?> getPlatformVersion() {
    return VideoDecodePluginPlatform.instance.getPlatformVersion();
  }

  /// 检查当前平台是否支持
  static bool get isPlatformSupported {
    return Platform.isAndroid || Platform.isIOS;
  }

  /// 获取默认纹理ID
  static int? get textureId => _textureId;

  /// 注册插件（不需要手动调用）
  static void registerWith() {
    // 仅用于插件注册
  }
}

/// 在Dart中实现简单的同步锁
void synchronized(Object lock, Function() action) {
  // 在单线程的Dart中，我们不需要真正的锁
  // 但我们保留这个结构以便将来可能的改进
  action();
}

/// 在同步锁中执行并返回结果的版本
T synchronizedWithResult<T>(Object lock, T Function() action) {
  return action();
}