refactor: convert NextRenderersFactory to kotlin (#17)

ffcodecs/src/main/java/io/github/anilbeesetti/nextlib/ffcodecs/NextRenderersFactory.kt

@@ -0,0 +1,93 @@
+package io.github.anilbeesetti.nextlib.ffcodecs
+
+import android.content.Context
+import android.os.Handler
+import androidx.media3.common.util.Log
+import androidx.media3.exoplayer.DefaultRenderersFactory
+import androidx.media3.exoplayer.Renderer
+import androidx.media3.exoplayer.audio.AudioRendererEventListener
+import androidx.media3.exoplayer.audio.AudioSink
+import androidx.media3.exoplayer.mediacodec.MediaCodecSelector
+import androidx.media3.exoplayer.video.VideoRendererEventListener
+
+class NextRenderersFactory(context: Context) : DefaultRenderersFactory(context) {
+    override fun buildAudioRenderers(
+        context: Context,
+        extensionRendererMode: Int,
+        mediaCodecSelector: MediaCodecSelector,
+        enableDecoderFallback: Boolean,
+        audioSink: AudioSink,
+        eventHandler: Handler,
+        eventListener: AudioRendererEventListener,
+        out: ArrayList<Renderer>
+    ) {
+        super.buildAudioRenderers(
+            context,
+            extensionRendererMode,
+            mediaCodecSelector,
+            enableDecoderFallback,
+            audioSink,
+            eventHandler,
+            eventListener,
+            out
+        )
+
+        if (extensionRendererMode == EXTENSION_RENDERER_MODE_OFF) return
+
+        var extensionRendererIndex = out.size
+        if (extensionRendererMode == EXTENSION_RENDERER_MODE_PREFER) {
+            extensionRendererIndex--
+        }
+
+        try {
+            val renderer = FfmpegAudioRenderer(eventHandler, eventListener, audioSink)
+            out.add(extensionRendererIndex++, renderer)
+            Log.i(TAG, "Loaded FfmpegAudioRenderer.")
+        } catch (e: Exception) {
+            // The extension is present, but instantiation failed.
+            throw RuntimeException("Error instantiating Ffmpeg extension", e)
+        }
+    }
+
+    override fun buildVideoRenderers(
+        context: Context,
+        extensionRendererMode: Int,
+        mediaCodecSelector: MediaCodecSelector,
+        enableDecoderFallback: Boolean,
+        eventHandler: Handler,
+        eventListener: VideoRendererEventListener,
+        allowedVideoJoiningTimeMs: Long,
+        out: ArrayList<Renderer>
+    ) {
+        super.buildVideoRenderers(
+            context,
+            extensionRendererMode,
+            mediaCodecSelector,
+            enableDecoderFallback,
+            eventHandler,
+            eventListener,
+            allowedVideoJoiningTimeMs,
+            out
+        )
+
+        if (extensionRendererMode == EXTENSION_RENDERER_MODE_OFF) return
+
+        var extensionRendererIndex = out.size
+        if (extensionRendererMode == EXTENSION_RENDERER_MODE_PREFER) {
+            extensionRendererIndex--
+        }
+
+        try {
+            val renderer = FfmpegVideoRenderer(allowedVideoJoiningTimeMs, eventHandler, eventListener, MAX_DROPPED_VIDEO_FRAME_COUNT_TO_NOTIFY)
+            out.add(extensionRendererIndex++, renderer)
+            Log.i(TAG, "Loaded FfmpegVideoRenderer.")
+        } catch (e: java.lang.Exception) {
+            // The extension is present, but instantiation failed.
+            throw java.lang.RuntimeException("Error instantiating Ffmpeg extension", e)
+        }
+    }
+
+    companion object {
+        const val TAG = "NextRenderersFactory"
+    }
+}