From 09c6b1c1f17ad20c87a3bee7c4665bb6ef34a211 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 22 Aug 2012 10:32:08 +0200
Subject: [PATCH 2/4] Setup vp8enc in a way suitable for realtime encoding

Note that upstream has nacked this patch wanting to fix it instead by
using a realtime vp8enc preset, and teaching vp8enc to automatically pick
a number of threads when threads == 0, see:
https://bugzilla.gnome.org/show_bug.cgi?id=678447

Although that would indeed be better, unfortunately code for neither exists
atm, so for now we carry this patch in Fedora, since it makes the difference
between making recordings in cheese working or not working.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 libcheese/cheese-camera.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/libcheese/cheese-camera.c b/libcheese/cheese-camera.c
index af073f3..d41a669 100644
--- a/libcheese/cheese-camera.c
+++ b/libcheese/cheese-camera.c
@@ -32,6 +32,7 @@
 #include <clutter-gst/clutter-gst.h>
 #include <gst/gst.h>
 #include <X11/Xlib.h>
+#include <unistd.h>
 
 #include "cheese-camera.h"
 #include "cheese-camera-device.h"
@@ -444,6 +445,7 @@ cheese_camera_set_video_recording (CheeseCamera *camera, GError **error)
   CheeseCameraPrivate *priv = camera->priv;
   GstElement          *video_enc;
   GstElement          *mux;
+  int                 n_threads;
 
   g_return_if_fail (error == NULL || *error == NULL);
 
@@ -453,11 +455,18 @@ cheese_camera_set_video_recording (CheeseCamera *camera, GError **error)
     return;
   }
   g_object_set (priv->camerabin, "video-encoder", video_enc, NULL);
-  /* Use a preset, or set some reasonable defaults. */
-  if (!gst_preset_load_preset (GST_PRESET (video_enc), "Profile Realtime"))
-  {
-    g_object_set (G_OBJECT (video_enc), "max-latency", 1, "speed", 2, NULL);
-  }
+
+  /* Since we do realtime encoding setup the encoder for speed without
+     sacrificing too much quality */
+  g_object_set (G_OBJECT (video_enc), "max-latency", 1, NULL);
+  g_object_set (G_OBJECT (video_enc), "speed", 6, NULL);
+#ifdef _SC_NPROCESSORS_ONLN
+  n_threads = sysconf (_SC_NPROCESSORS_ONLN); /* includes hyper-threading */
+  n_threads = MIN (n_threads, 64);
+#else
+  n_threads = 3;
+#endif
+  g_object_set (G_OBJECT (video_enc), "threads", n_threads, NULL);
 
   if ((mux = gst_element_factory_make ("webmmux", "webmmux")) == NULL)
   {
@@ -692,6 +701,7 @@ cheese_camera_play (CheeseCamera *camera)
 {
   CheeseCameraPrivate *priv;
   CheeseCameraDevice *device;
+  GObject *video_enc;
   GstCaps *caps;
 
   g_return_if_fail (CHEESE_IS_CAMERA (camera));
@@ -714,6 +724,12 @@ cheese_camera_play (CheeseCamera *camera)
     g_signal_emit_by_name (priv->camerabin, "set-video-resolution-fps",
                            priv->current_format->width,
                            priv->current_format->height, 0, 1, 0);
+    if (priv->current_format->width >= 1280 &&
+        priv->current_format->height >= 720)
+    {
+      g_object_get (priv->camerabin, "video-encoder", &video_enc, NULL);
+      g_object_set (video_enc, "token-parts", 2, NULL);
+    }
   }
   gst_caps_unref (caps);
 
-- 
1.7.11.4