From: Johann <johannkoenig@google.com>
Date: Mon, 23 Jul 2012 21:55:32 +0000 (-0700)
Subject: Make random streams consistant
X-Git-Tag: v1.2.0~136^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e3e63fbcbae81c1244b638e74bde4f895fb92c58;p=libvpx

Make random streams consistant

Reset the seed so the second pass stream matches the first

Change-Id: Id0c0f73abb835b5ca92d76b14e0b02f6239a6ee3
---

diff --git a/test/video_source.h b/test/video_source.h
index 3507ef0cd..7347c8dd0 100644
--- a/test/video_source.h
+++ b/test/video_source.h
@@ -9,6 +9,8 @@
  */
 #ifndef TEST_VIDEO_SOURCE_H_
 #define TEST_VIDEO_SOURCE_H_
+
+#include "test/acm_random.h"
 #include "vpx/vpx_encoder.h"
 
 namespace libvpx_test {
@@ -99,16 +101,28 @@ class DummyVideoSource : public VideoSource {
 
 
 class RandomVideoSource : public DummyVideoSource {
+ public:
+  RandomVideoSource() : rnd_(ACMRandom::DeterministicSeed()) {}
+
  protected:
+  // Reset the RNG to get a matching stream for the second pass
+  virtual void Begin() {
+    frame_ = 0;
+    rnd_.Reset(ACMRandom::DeterministicSeed());
+    FillFrame();
+  }
+
   // 15 frames of noise, followed by 15 static frames. Reset to 0 rather
   // than holding previous frames to encourage keyframes to be thrown.
   virtual void FillFrame() {
     if (frame_ % 30 < 15)
       for (size_t i = 0; i < raw_sz_; ++i)
-        img_->img_data[i] = rand();
+        img_->img_data[i] = rnd_.Rand8();
     else
       memset(img_->img_data, 0, raw_sz_);
   }
+
+  ACMRandom rnd_;
 };
 
 }  // namespace libvpx_test