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
18namespace {
19
20// CQ level range: [kCQLevelMin, kCQLevelMax).
21const int kCQLevelMin = 4;
22const int kCQLevelMax = 63;
23const int kCQLevelStep = 8;
24const unsigned int kCQTargetBitrate = 2000;
25
26class 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
103CQTest::BitrateMap CQTest::bitrates_;
104
105TEST_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
129VP8_INSTANTIATE_TEST_CASE(CQTest, ::testing::Range(kCQLevelMin, kCQLevelMax,
130                                                   kCQLevelStep));
131}  // namespace
132