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      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 <map>
     12 #include "third_party/googletest/src/include/gtest/gtest.h"
     13 #include "test/codec_factory.h"
     14 #include "test/encode_test_driver.h"
     15 #include "test/i420_video_source.h"
     16 #include "test/util.h"
     17 
     18 namespace {
     19 
     20 // CQ level range: [kCQLevelMin, kCQLevelMax).
     21 const int kCQLevelMin = 4;
     22 const int kCQLevelMax = 63;
     23 const int kCQLevelStep = 8;
     24 const unsigned int kCQTargetBitrate = 2000;
     25 
     26 class CQTest : public ::libvpx_test::EncoderTest,
     27                public ::libvpx_test::CodecTestWithParam<int> {
     28  public:
     29   // maps the cqlevel to the bitrate produced.
     30   typedef std::map<int, uint32_t> BitrateMap;
     31 
     32   static void SetUpTestCase() { bitrates_.clear(); }
     33 
     34   static void TearDownTestCase() {
     35     ASSERT_TRUE(!HasFailure())
     36         << "skipping bitrate validation due to earlier failure.";
     37     uint32_t prev_actual_bitrate = kCQTargetBitrate;
     38     for (BitrateMap::const_iterator iter = bitrates_.begin();
     39          iter != bitrates_.end(); ++iter) {
     40       const uint32_t cq_actual_bitrate = iter->second;
     41       EXPECT_LE(cq_actual_bitrate, prev_actual_bitrate)
     42           << "cq_level: " << iter->first
     43           << ", bitrate should decrease with increase in CQ level.";
     44       prev_actual_bitrate = cq_actual_bitrate;
     45     }
     46   }
     47 
     48  protected:
     49   CQTest() : EncoderTest(GET_PARAM(0)), cq_level_(GET_PARAM(1)) {
     50     init_flags_ = VPX_CODEC_USE_PSNR;
     51   }
     52 
     53   virtual ~CQTest() {}
     54 
     55   virtual void SetUp() {
     56     InitializeConfig();
     57     SetMode(libvpx_test::kTwoPassGood);
     58   }
     59 
     60   virtual void BeginPassHook(unsigned int /*pass*/) {
     61     file_size_ = 0;
     62     psnr_ = 0.0;
     63     n_frames_ = 0;
     64   }
     65 
     66   virtual void PreEncodeFrameHook(libvpx_test::VideoSource *video,
     67                                   libvpx_test::Encoder *encoder) {
     68     if (video->frame() == 1) {
     69       if (cfg_.rc_end_usage == VPX_CQ) {
     70         encoder->Control(VP8E_SET_CQ_LEVEL, cq_level_);
     71       }
     72       encoder->Control(VP8E_SET_CPUUSED, 3);
     73     }
     74   }
     75 
     76   virtual void PSNRPktHook(const vpx_codec_cx_pkt_t *pkt) {
     77     psnr_ += pow(10.0, pkt->data.psnr.psnr[0] / 10.0);
     78     n_frames_++;
     79   }
     80 
     81   virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
     82     file_size_ += pkt->data.frame.sz;
     83   }
     84 
     85   double GetLinearPSNROverBitrate() const {
     86     double avg_psnr = log10(psnr_ / n_frames_) * 10.0;
     87     return pow(10.0, avg_psnr / 10.0) / file_size_;
     88   }
     89 
     90   int cq_level() const { return cq_level_; }
     91   size_t file_size() const { return file_size_; }
     92   int n_frames() const { return n_frames_; }
     93 
     94   static BitrateMap bitrates_;
     95 
     96  private:
     97   int cq_level_;
     98   size_t file_size_;
     99   double psnr_;
    100   int n_frames_;
    101 };
    102 
    103 CQTest::BitrateMap CQTest::bitrates_;
    104 
    105 TEST_P(CQTest, LinearPSNRIsHigherForCQLevel) {
    106   const vpx_rational timebase = { 33333333, 1000000000 };
    107   cfg_.g_timebase = timebase;
    108   cfg_.rc_target_bitrate = kCQTargetBitrate;
    109   cfg_.g_lag_in_frames = 25;
    110 
    111   cfg_.rc_end_usage = VPX_CQ;
    112   libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
    113                                      timebase.den, timebase.num, 0, 30);
    114   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
    115   const double cq_psnr_lin = GetLinearPSNROverBitrate();
    116   const unsigned int cq_actual_bitrate =
    117       static_cast<unsigned int>(file_size()) * 8 * 30 / (n_frames() * 1000);
    118   EXPECT_LE(cq_actual_bitrate, kCQTargetBitrate);
    119   bitrates_[cq_level()] = cq_actual_bitrate;
    120 
    121   // try targeting the approximate same bitrate with VBR mode
    122   cfg_.rc_end_usage = VPX_VBR;
    123   cfg_.rc_target_bitrate = cq_actual_bitrate;
    124   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
    125   const double vbr_psnr_lin = GetLinearPSNROverBitrate();
    126   EXPECT_GE(cq_psnr_lin, vbr_psnr_lin);
    127 }
    128 
    129 VP8_INSTANTIATE_TEST_CASE(CQTest, ::testing::Range(kCQLevelMin, kCQLevelMax,
    130                                                    kCQLevelStep));
    131 }  // namespace
    132