Home | History | Annotate | Download | only in test 
      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 unsigned 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   size_t file_size() const { return file_size_; }
     70   int n_frames() const { return n_frames_; }
     71 
     72  private:
     73   int cq_level_;
     74   size_t file_size_;
     75   double psnr_;
     76   int n_frames_;
     77 };
     78 
     79 unsigned 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 unsigned int cq_actual_bitrate =
     92       static_cast<unsigned int>(file_size()) * 8 * 30 / (n_frames() * 1000);
     93   EXPECT_LE(cq_actual_bitrate, kCQTargetBitrate);
     94   EXPECT_LE(cq_actual_bitrate, prev_actual_bitrate);
     95   prev_actual_bitrate = cq_actual_bitrate;
     96 
     97   // try targeting the approximate same bitrate with VBR mode
     98   cfg_.rc_end_usage = VPX_VBR;
     99   cfg_.rc_target_bitrate = cq_actual_bitrate;
    100   ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
    101   const double vbr_psnr_lin = GetLinearPSNROverBitrate();
    102   EXPECT_GE(cq_psnr_lin, vbr_psnr_lin);
    103 }
    104 
    105 VP8_INSTANTIATE_TEST_CASE(CQTest,
    106                           ::testing::Range(kCQLevelMin, kCQLevelMax,
    107                                            kCQLevelStep));
    108 }  // namespace
    109