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
SetUpTestSuite()32 static void SetUpTestSuite() { bitrates_.clear(); }
33
TearDownTestSuite()34 static void TearDownTestSuite() {
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:
CQTest()49 CQTest() : EncoderTest(GET_PARAM(0)), cq_level_(GET_PARAM(1)) {
50 init_flags_ = VPX_CODEC_USE_PSNR;
51 }
52
53 ~CQTest() override = default;
54
SetUp()55 void SetUp() override {
56 InitializeConfig();
57 SetMode(libvpx_test::kTwoPassGood);
58 }
59
BeginPassHook(unsigned int)60 void BeginPassHook(unsigned int /*pass*/) override {
61 file_size_ = 0;
62 psnr_ = 0.0;
63 n_frames_ = 0;
64 }
65
PreEncodeFrameHook(libvpx_test::VideoSource * video,libvpx_test::Encoder * encoder)66 void PreEncodeFrameHook(libvpx_test::VideoSource *video,
67 libvpx_test::Encoder *encoder) override {
68 if (video->frame() == 0) {
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
PSNRPktHook(const vpx_codec_cx_pkt_t * pkt)76 void PSNRPktHook(const vpx_codec_cx_pkt_t *pkt) override {
77 psnr_ += pow(10.0, pkt->data.psnr.psnr[0] / 10.0);
78 n_frames_++;
79 }
80
FramePktHook(const vpx_codec_cx_pkt_t * pkt)81 void FramePktHook(const vpx_codec_cx_pkt_t *pkt) override {
82 file_size_ += pkt->data.frame.sz;
83 }
84
GetLinearPSNROverBitrate() const85 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
cq_level() const90 int cq_level() const { return cq_level_; }
file_size() const91 size_t file_size() const { return file_size_; }
n_frames() const92 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
TEST_P(CQTest,LinearPSNRIsHigherForCQLevel)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_SUITE(CQTest, ::testing::Range(kCQLevelMin, kCQLevelMax,
130 kCQLevelStep));
131 } // namespace
132