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
17namespace {
18
19// CQ level range: [kCQLevelMin, kCQLevelMax).
20const int kCQLevelMin = 4;
21const int kCQLevelMax = 63;
22const int kCQLevelStep = 8;
23const unsigned int kCQTargetBitrate = 2000;
24
25class 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
79unsigned int prev_actual_bitrate = kCQTargetBitrate;
80TEST_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
105VP8_INSTANTIATE_TEST_CASE(CQTest,
106                          ::testing::Range(kCQLevelMin, kCQLevelMax,
107                                           kCQLevelStep));
108}  // namespace
109