1 files changed, 131 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/test/cq_test.cc b/media/libvpx/libvpx/test/cq_test.cc
new file mode 100644
index 0000000000..292adb0d04
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+++ b/media/libvpx/libvpx/test/cq_test.cc
@@ -0,0 +1,131 @@
+/*
+ *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include <cmath>
+#include <map>
+#include "third_party/googletest/src/include/gtest/gtest.h"
+#include "test/codec_factory.h"
+#include "test/encode_test_driver.h"
+#include "test/i420_video_source.h"
+#include "test/util.h"
+
+namespace {
+
+// CQ level range: [kCQLevelMin, kCQLevelMax).
+const int kCQLevelMin = 4;
+const int kCQLevelMax = 63;
+const int kCQLevelStep = 8;
+const unsigned int kCQTargetBitrate = 2000;
+
+class CQTest : public ::libvpx_test::EncoderTest,
+               public ::libvpx_test::CodecTestWithParam<int> {
+ public:
+  // maps the cqlevel to the bitrate produced.
+  typedef std::map<int, uint32_t> BitrateMap;
+
+  static void SetUpTestSuite() { bitrates_.clear(); }
+
+  static void TearDownTestSuite() {
+    ASSERT_TRUE(!HasFailure())
+        << "skipping bitrate validation due to earlier failure.";
+    uint32_t prev_actual_bitrate = kCQTargetBitrate;
+    for (BitrateMap::const_iterator iter = bitrates_.begin();
+         iter != bitrates_.end(); ++iter) {
+      const uint32_t cq_actual_bitrate = iter->second;
+      EXPECT_LE(cq_actual_bitrate, prev_actual_bitrate)
+          << "cq_level: " << iter->first
+          << ", bitrate should decrease with increase in CQ level.";
+      prev_actual_bitrate = cq_actual_bitrate;
+    }
+  }
+
+ protected:
+  CQTest() : EncoderTest(GET_PARAM(0)), cq_level_(GET_PARAM(1)) {
+    init_flags_ = VPX_CODEC_USE_PSNR;
+  }
+
+  virtual ~CQTest() {}
+
+  virtual void SetUp() {
+    InitializeConfig();
+    SetMode(libvpx_test::kTwoPassGood);
+  }
+
+  virtual void BeginPassHook(unsigned int /*pass*/) {
+    file_size_ = 0;
+    psnr_ = 0.0;
+    n_frames_ = 0;
+  }
+
+  virtual void PreEncodeFrameHook(libvpx_test::VideoSource *video,
+                                  libvpx_test::Encoder *encoder) {
+    if (video->frame() == 0) {
+      if (cfg_.rc_end_usage == VPX_CQ) {
+        encoder->Control(VP8E_SET_CQ_LEVEL, cq_level_);
+      }
+      encoder->Control(VP8E_SET_CPUUSED, 3);
+    }
+  }
+
+  virtual void PSNRPktHook(const vpx_codec_cx_pkt_t *pkt) {
+    psnr_ += pow(10.0, pkt->data.psnr.psnr[0] / 10.0);
+    n_frames_++;
+  }
+
+  virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
+    file_size_ += pkt->data.frame.sz;
+  }
+
+  double GetLinearPSNROverBitrate() const {
+    double avg_psnr = log10(psnr_ / n_frames_) * 10.0;
+    return pow(10.0, avg_psnr / 10.0) / file_size_;
+  }
+
+  int cq_level() const { return cq_level_; }
+  size_t file_size() const { return file_size_; }
+  int n_frames() const { return n_frames_; }
+
+  static BitrateMap bitrates_;
+
+ private:
+  int cq_level_;
+  size_t file_size_;
+  double psnr_;
+  int n_frames_;
+};
+
+CQTest::BitrateMap CQTest::bitrates_;
+
+TEST_P(CQTest, LinearPSNRIsHigherForCQLevel) {
+  const vpx_rational timebase = { 33333333, 1000000000 };
+  cfg_.g_timebase = timebase;
+  cfg_.rc_target_bitrate = kCQTargetBitrate;
+  cfg_.g_lag_in_frames = 25;
+
+  cfg_.rc_end_usage = VPX_CQ;
+  libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
+                                     timebase.den, timebase.num, 0, 30);
+  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
+  const double cq_psnr_lin = GetLinearPSNROverBitrate();
+  const unsigned int cq_actual_bitrate =
+      static_cast<unsigned int>(file_size()) * 8 * 30 / (n_frames() * 1000);
+  EXPECT_LE(cq_actual_bitrate, kCQTargetBitrate);
+  bitrates_[cq_level()] = cq_actual_bitrate;
+
+  // try targeting the approximate same bitrate with VBR mode
+  cfg_.rc_end_usage = VPX_VBR;
+  cfg_.rc_target_bitrate = cq_actual_bitrate;
+  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
+  const double vbr_psnr_lin = GetLinearPSNROverBitrate();
+  EXPECT_GE(cq_psnr_lin, vbr_psnr_lin);
+}
+
+VP8_INSTANTIATE_TEST_SUITE(CQTest, ::testing::Range(kCQLevelMin, kCQLevelMax,
+                                                    kCQLevelStep));
+}  // namespace