尝试接入图像处理

+/*
+ * Copyright 2024 LiveKit, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.livekit.android.room.track.video
+import livekit.org.webrtc.VideoFrame
+import java.nio.ByteBuffer
+// Native OpenCV implementation via JNI
+
+class OpenCVVideoProcessor : ChainVideoProcessor() {
+
+    companion object {
+        init {
+            System.loadLibrary("rvmncnn")
+        }
+    }
+
+    private external fun processI420(y: ByteArray, u: ByteArray, v: ByteArray, width: Int, height: Int, rotation: Int, timestamp: Long): Array<ByteArray>
+
+    override fun onFrameCaptured(frame: VideoFrame) {
+        val buffer = frame.buffer
+        if (buffer !is VideoFrame.I420Buffer) {
+            continueChain(frame)
+            return
+        }
+
+        val yArray = ByteArray(buffer.strideY * buffer.height)
+        buffer.dataY.get(yArray)
+        val uArray = ByteArray(buffer.strideU * (buffer.height + 1) / 2)
+        buffer.dataU.get(uArray)
+        val vArray = ByteArray(buffer.strideV * (buffer.height + 1) / 2)
+        buffer.dataV.get(vArray)
+
+        val result = processI420(yArray, uArray, vArray, buffer.width, buffer.height, frame.rotation, frame.timestampNs)
+
+        val newY = ByteBuffer.wrap(result[0])
+        val newU = ByteBuffer.wrap(result[1])
+        val newV = ByteBuffer.wrap(result[2])
+
+        val newBuffer = livekit.org.webrtc.JavaI420Buffer.wrap(buffer.width, buffer.height, newY, buffer.width, newU, buffer.width / 2, newV, buffer.width / 2, null)
+
+        val newFrame = VideoFrame(newBuffer, frame.rotation, frame.timestampNs)
+        continueChain(newFrame)
+    }
+}
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