test/cq_test.cc

   1 /*
   2  *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10 #include <cmath>
  11 #include "third_party/googletest/src/include/gtest/gtest.h"
  12 #include "test/codec_factory.h"
  13 #include "test/encode_test_driver.h"
  14 #include "test/i420_video_source.h"
  15 #include "test/util.h"
  16
  17 namespace {
  18
  19 // CQ level range: [kCQLevelMin, kCQLevelMax).
  20 const int kCQLevelMin = 4;
  21 const int kCQLevelMax = 63;
  22 const int kCQLevelStep = 8;
  23 const int kCQTargetBitrate = 2000;
  24
  25 class CQTest : public ::libvpx_test::EncoderTest,
  26     public ::libvpx_test::CodecTestWithParam<int> {
  27  protected:
  28   CQTest() : EncoderTest(GET_PARAM(0)), cq_level_(GET_PARAM(1)) {
  29     init_flags_ = VPX_CODEC_USE_PSNR;
  30   }
  31
  32   virtual ~CQTest() {}
  33
  34   virtual void SetUp() {
  35     InitializeConfig();
  36     SetMode(libvpx_test::kTwoPassGood);
  37   }
  38
  39   virtual void BeginPassHook(unsigned int /*pass*/) {
  40     file_size_ = 0;
  41     psnr_ = 0.0;
  42     n_frames_ = 0;
  43   }
  44
  45   virtual void PreEncodeFrameHook(libvpx_test::VideoSource *video,
  46                                   libvpx_test::Encoder *encoder) {
  47     if (video->frame() == 1) {
  48       if (cfg_.rc_end_usage == VPX_CQ) {
  49         encoder->Control(VP8E_SET_CQ_LEVEL, cq_level_);
  50       }
  51       encoder->Control(VP8E_SET_CPUUSED, 3);
  52     }
  53   }
  54
  55   virtual void PSNRPktHook(const vpx_codec_cx_pkt_t *pkt) {
  56     psnr_ += pow(10.0, pkt->data.psnr.psnr[0] / 10.0);
  57     n_frames_++;
  58   }
  59
  60   virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
  61     file_size_ += pkt->data.frame.sz;
  62   }
  63
  64   double GetLinearPSNROverBitrate() const {
  65     double avg_psnr = log10(psnr_ / n_frames_) * 10.0;
  66     return pow(10.0, avg_psnr / 10.0) / file_size_;
  67   }
  68
  69   int file_size() const { return file_size_; }
  70   int n_frames() const { return n_frames_; }
  71
  72  private:
  73   int cq_level_;
  74   int file_size_;
  75   double psnr_;
  76   int n_frames_;
  77 };
  78
  79 int prev_actual_bitrate = kCQTargetBitrate;
  80 TEST_P(CQTest, LinearPSNRIsHigherForCQLevel) {
  81   const vpx_rational timebase = { 33333333, 1000000000 };
  82   cfg_.g_timebase = timebase;
  83   cfg_.rc_target_bitrate = kCQTargetBitrate;
  84   cfg_.g_lag_in_frames = 25;
  85
  86   cfg_.rc_end_usage = VPX_CQ;
  87   libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
  88                                      timebase.den, timebase.num, 0, 30);
  89   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
  90   const double cq_psnr_lin = GetLinearPSNROverBitrate();
  91   const int cq_actual_bitrate = file_size() * 8 * 30 / (n_frames() * 1000);
  92   EXPECT_LE(cq_actual_bitrate, kCQTargetBitrate);
  93   EXPECT_LE(cq_actual_bitrate, prev_actual_bitrate);
  94   prev_actual_bitrate = cq_actual_bitrate;
  95
  96   // try targeting the approximate same bitrate with VBR mode
  97   cfg_.rc_end_usage = VPX_VBR;
  98   cfg_.rc_target_bitrate = cq_actual_bitrate;
  99   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
 100   const double vbr_psnr_lin = GetLinearPSNROverBitrate();
 101   EXPECT_GE(cq_psnr_lin, vbr_psnr_lin);
 102 }
 103
 104 VP8_INSTANTIATE_TEST_CASE(CQTest,
 105                           ::testing::Range(kCQLevelMin, kCQLevelMax,
 106                                            kCQLevelStep));
 107 }  // namespace