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() {
33    bitrates_.clear();
34  }
35
36  static void TearDownTestCase() {
37    ASSERT_TRUE(!HasFailure())
38        << "skipping bitrate validation due to earlier failure.";
39    uint32_t prev_actual_bitrate = kCQTargetBitrate;
40    for (BitrateMap::const_iterator iter = bitrates_.begin();
41         iter != bitrates_.end(); ++iter) {
42      const uint32_t cq_actual_bitrate = iter->second;
43      EXPECT_LE(cq_actual_bitrate, prev_actual_bitrate)
44          << "cq_level: " << iter->first
45          << ", bitrate should decrease with increase in CQ level.";
46      prev_actual_bitrate = cq_actual_bitrate;
47    }
48  }
49
50 protected:
51  CQTest() : EncoderTest(GET_PARAM(0)), cq_level_(GET_PARAM(1)) {
52    init_flags_ = VPX_CODEC_USE_PSNR;
53  }
54
55  virtual ~CQTest() {}
56
57  virtual void SetUp() {
58    InitializeConfig();
59    SetMode(libvpx_test::kTwoPassGood);
60  }
61
62  virtual void BeginPassHook(unsigned int /*pass*/) {
63    file_size_ = 0;
64    psnr_ = 0.0;
65    n_frames_ = 0;
66  }
67
68  virtual void PreEncodeFrameHook(libvpx_test::VideoSource *video,
69                                  libvpx_test::Encoder *encoder) {
70    if (video->frame() == 1) {
71      if (cfg_.rc_end_usage == VPX_CQ) {
72        encoder->Control(VP8E_SET_CQ_LEVEL, cq_level_);
73      }
74      encoder->Control(VP8E_SET_CPUUSED, 3);
75    }
76  }
77
78  virtual void PSNRPktHook(const vpx_codec_cx_pkt_t *pkt) {
79    psnr_ += pow(10.0, pkt->data.psnr.psnr[0] / 10.0);
80    n_frames_++;
81  }
82
83  virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
84    file_size_ += pkt->data.frame.sz;
85  }
86
87  double GetLinearPSNROverBitrate() const {
88    double avg_psnr = log10(psnr_ / n_frames_) * 10.0;
89    return pow(10.0, avg_psnr / 10.0) / file_size_;
90  }
91
92  int cq_level() const { return cq_level_; }
93  size_t file_size() const { return file_size_; }
94  int n_frames() const { return n_frames_; }
95
96  static BitrateMap bitrates_;
97
98 private:
99  int cq_level_;
100  size_t file_size_;
101  double psnr_;
102  int n_frames_;
103};
104
105CQTest::BitrateMap CQTest::bitrates_;
106
107TEST_P(CQTest, LinearPSNRIsHigherForCQLevel) {
108  const vpx_rational timebase = { 33333333, 1000000000 };
109  cfg_.g_timebase = timebase;
110  cfg_.rc_target_bitrate = kCQTargetBitrate;
111  cfg_.g_lag_in_frames = 25;
112
113  cfg_.rc_end_usage = VPX_CQ;
114  libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
115                                     timebase.den, timebase.num, 0, 30);
116  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
117  const double cq_psnr_lin = GetLinearPSNROverBitrate();
118  const unsigned int cq_actual_bitrate =
119      static_cast<unsigned int>(file_size()) * 8 * 30 / (n_frames() * 1000);
120  EXPECT_LE(cq_actual_bitrate, kCQTargetBitrate);
121  bitrates_[cq_level()] = cq_actual_bitrate;
122
123  // try targeting the approximate same bitrate with VBR mode
124  cfg_.rc_end_usage = VPX_VBR;
125  cfg_.rc_target_bitrate = cq_actual_bitrate;
126  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
127  const double vbr_psnr_lin = GetLinearPSNROverBitrate();
128  EXPECT_GE(cq_psnr_lin, vbr_psnr_lin);
129}
130
131VP8_INSTANTIATE_TEST_CASE(CQTest,
132                          ::testing::Range(kCQLevelMin, kCQLevelMax,
133                                           kCQLevelStep));
134}  // namespace
135