Update VP8 encode options to speed up encoding for remoting

remoting/base/encoder_vp8.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+B1;2305;0c// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/base/encoder_vp8.h"
 
 #include "base/logging.h"
 #include "media/base/callback.h"
 #include "media/base/yuv_convert.h"
 #include "remoting/base/capture_data.h"
 #include "remoting/base/util.h"
@@ skipping 80 matching lines @@
   CHECK(algo);
   vpx_codec_err_t ret = vpx_codec_enc_config_default(algo, &config, 0);
   if (ret != VPX_CODEC_OK)
     return false;
 
   // Initialize active map.
   active_map_width_ = (size.width() + kMacroBlockSize - 1) / kMacroBlockSize;
   active_map_height_ = (size.height() + kMacroBlockSize - 1) / kMacroBlockSize;
   active_map_.reset(new uint8[active_map_width_ * active_map_height_]);
 
-  // TODO(hclam): Tune the parameters to better suit the application.
   config.rc_target_bitrate = size.width() * size.height() *
       config.rc_target_bitrate / config.g_w / config.g_h;
   config.g_w = size.width();
   config.g_h = size.height();
   config.g_pass = VPX_RC_ONE_PASS;
-  config.g_profile = 1;
-  config.g_threads = 1;
+  config.g_profile = 2;
+  config.g_threads = 2;
   config.rc_min_quantizer = 20;
   config.rc_max_quantizer = 30;
   config.g_timebase.num = 1;
   config.g_timebase.den = 20;
 
   if (vpx_codec_enc_init(codec_.get(), algo, &config, 0))
     return false;
+  if (vpx_codec_control(codec_.get(), VP8E_SET_CPUUSED, 16))

[dmac, 2011/05/28 00:16:33]

Can we put some comments here as to why these values were chosen? (in both
cases).

+    return false;
+  if (vpx_codec_control(codec_.get(), VP8E_SET_NOISE_SENSITIVITY, 0))
+    return false;
   return true;
 }
 
 static int RoundToTwosMultiple(int x) {
   return x & (~1);
 }
 
 // Align the sides of the rectangle to multiples of 2 (expanding outwards).
 static gfx::Rect AlignRect(const gfx::Rect& rect) {
   int x = RoundToTwosMultiple(rect.x());
@@ skipping 154 matching lines @@
     rect->set_y(updated_rects[i].y());
     rect->set_width(updated_rects[i].width());
     rect->set_height(updated_rects[i].height());
   }
 
   data_available_callback->Run(message);
   delete data_available_callback;
 }
 
 }  // namespace remoting