Android VideoCapture : Use NV21 instead of YUV12 and clean up.

talk/app/webrtc/java/jni/androidmediadecoder_jni.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 300 matching lines @@
     ALOGE << "Release failure: " << ret_val << " - fallback to SW codec";
     sw_fallback_required_ = true;
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
 
   // Always start with a complete key frame.
   key_frame_required_ = true;
   frames_received_ = 0;
   frames_decoded_ = 0;
 
+  jobject java_surface_texture_helper_ = nullptr;
   if (use_surface_) {
+    java_surface_texture_helper_ = jni->CallStaticObjectMethod(
+        FindClass(jni, "org/webrtc/SurfaceTextureHelper"),
+        GetStaticMethodID(jni,
+                          FindClass(jni, "org/webrtc/SurfaceTextureHelper"),
+                          "create",
+                          "(Lorg/webrtc/EglBase$Context;)"
+                          "Lorg/webrtc/SurfaceTextureHelper;"),
+        render_egl_context_);
+    RTC_CHECK(java_surface_texture_helper_ != nullptr);
     surface_texture_helper_ = new rtc::RefCountedObject<SurfaceTextureHelper>(
-        jni, render_egl_context_);
+        jni, java_surface_texture_helper_);
   }
 
   jobject j_video_codec_enum = JavaEnumFromIndex(
       jni, "MediaCodecVideoDecoder$VideoCodecType", codecType_);
   bool success = jni->CallBooleanMethod(
       *j_media_codec_video_decoder_,
       j_init_decode_method_,
       j_video_codec_enum,
       codec_.width,
       codec_.height,
-      use_surface_ ? surface_texture_helper_->GetJavaSurfaceTextureHelper()
-                   : nullptr);
+      java_surface_texture_helper_);
   if (CheckException(jni) || !success) {
     ALOGE << "Codec initialization error - fallback to SW codec.";
     sw_fallback_required_ = true;
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   inited_ = true;
 
   switch (codecType_) {
     case kVideoCodecVP8:
       max_pending_frames_ = kMaxPendingFramesVp8;
@@ skipping 546 matching lines @@
 }
 
 void MediaCodecVideoDecoderFactory::DestroyVideoDecoder(
     webrtc::VideoDecoder* decoder) {
   ALOGD << "Destroy video decoder.";
   delete decoder;
 }
 
 }  // namespace webrtc_jni