feat(decode): 用 WebRTC stats 替代原生探针计算解码耗时

webrtc_controller_flutter/android/app/build.gradle.kts

@@ -44,3 +44,10 @@ kotlin {
 flutter {
     source = "../.."
 }
+
+dependencies {
+    // flutter_webrtc 依赖了 io.github.webrtc-sdk（org.webrtc.*），但它声明为
+    // implementation，app 模块默认看不到 org.webrtc.VideoTrack/VideoSink 等类型。
+    // 这里显式引入同版本，使解码耗时探针能直接引用 libwebrtc 的 VideoTrack/VideoSink。
+    implementation("io.github.webrtc-sdk:android:144.7559.09")
+}

webrtc_controller_flutter/android/app/src/main/kotlin/com/ttstd/fluttercontroller/SelfCodecDecoderPlugin.kt

@@ -16,7 +16,6 @@ import io.flutter.view.TextureRegistry
 import java.io.ByteArrayOutputStream
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
-import org.webrtc.VideoFrame
 import org.webrtc.VideoSink
 import org.webrtc.VideoTrack
 import com.cloudwebrtc.webrtc.FlutterWebRTCPlugin
@@ -90,7 +89,7 @@ private class DecodeProbeSink {
                     val nowMs = System.currentTimeMillis()
                     framesSinceFps++
                     if (lastFpsStampMs != 0L && nowMs - lastFpsStampMs >= 1000) {
-                        fpsNow = framesSinceFps * 1000 / (nowMs - lastFpsStampMs)
+                        fpsNow = framesSinceFps * 1000 / (nowMs - lastFpsStampMs).toInt()
                         framesSinceFps = 0
                         lastFpsStampMs = nowMs
                     } else if (lastFpsStampMs == 0L) {
@@ -254,15 +253,22 @@ class SelfCodecDecoderPlugin :
         try {
             val plugin = FlutterWebRTCPlugin.sharedSingleton
             val track = plugin?.getRemoteTrack(trackId)
-            if (track !is VideoTrack) {
+            if (track == null) {
                 result.error("PROBE", "remote video track not found: $trackId", null)
                 return
             }
+            // getRemoteTrack 返回 org.webrtc.MediaStreamTrack（超类），addSink 只在
+            // 子类 org.webrtc.VideoTrack 上，用安全强转拿到 VideoTrack。
+            val videoTrack = track as? VideoTrack
+            if (videoTrack == null) {
+                result.error("PROBE", "track is not a video track: $trackId", null)
+                return
+            }
             detachWebRtcDecodeProbeInternal()
             val stats = DecodeProbeSink()
             val sink = VideoSink { stats.onFrame() }
-            track.addSink(sink)
-            probeHolder = ProbeHolder(track, sink, stats)
+            videoTrack.addSink(sink)
+            probeHolder = ProbeHolder(videoTrack, sink, stats)
             result.success(null)
         } catch (e: Exception) {
             Log.e(TAG, "attachWebRtcDecodeProbe failed", e)