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/*
* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <cmath>
#include <map>
#include "third_party/googletest/src/include/gtest/gtest.h"
#include "test/codec_factory.h"
#include "test/encode_test_driver.h"
#include "test/i420_video_source.h"
#include "test/util.h"
namespace {
// CQ level range: [kCQLevelMin, kCQLevelMax).
const int kCQLevelMin = 4;
const int kCQLevelMax = 63;
const int kCQLevelStep = 8;
const unsigned int kCQTargetBitrate = 2000;
class CQTest : public ::libvpx_test::EncoderTest,
public ::libvpx_test::CodecTestWithParam<int> {
public:
// maps the cqlevel to the bitrate produced.
typedef std::map<int, uint32_t> BitrateMap;
static void SetUpTestSuite() { bitrates_.clear(); }
static void TearDownTestSuite() {
ASSERT_TRUE(!HasFailure())
<< "skipping bitrate validation due to earlier failure.";
uint32_t prev_actual_bitrate = kCQTargetBitrate;
for (BitrateMap::const_iterator iter = bitrates_.begin();
iter != bitrates_.end(); ++iter) {
const uint32_t cq_actual_bitrate = iter->second;
EXPECT_LE(cq_actual_bitrate, prev_actual_bitrate)
<< "cq_level: " << iter->first
<< ", bitrate should decrease with increase in CQ level.";
prev_actual_bitrate = cq_actual_bitrate;
}
}
protected:
CQTest() : EncoderTest(GET_PARAM(0)), cq_level_(GET_PARAM(1)) {
init_flags_ = VPX_CODEC_USE_PSNR;
}
virtual ~CQTest() {}
virtual void SetUp() {
InitializeConfig();
SetMode(libvpx_test::kTwoPassGood);
}
virtual void BeginPassHook(unsigned int /*pass*/) {
file_size_ = 0;
psnr_ = 0.0;
n_frames_ = 0;
}
virtual void PreEncodeFrameHook(libvpx_test::VideoSource *video,
libvpx_test::Encoder *encoder) {
if (video->frame() == 0) {
if (cfg_.rc_end_usage == VPX_CQ) {
encoder->Control(VP8E_SET_CQ_LEVEL, cq_level_);
}
encoder->Control(VP8E_SET_CPUUSED, 3);
}
}
virtual void PSNRPktHook(const vpx_codec_cx_pkt_t *pkt) {
psnr_ += pow(10.0, pkt->data.psnr.psnr[0] / 10.0);
n_frames_++;
}
virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
file_size_ += pkt->data.frame.sz;
}
double GetLinearPSNROverBitrate() const {
double avg_psnr = log10(psnr_ / n_frames_) * 10.0;
return pow(10.0, avg_psnr / 10.0) / file_size_;
}
int cq_level() const { return cq_level_; }
size_t file_size() const { return file_size_; }
int n_frames() const { return n_frames_; }
static BitrateMap bitrates_;
private:
int cq_level_;
size_t file_size_;
double psnr_;
int n_frames_;
};
CQTest::BitrateMap CQTest::bitrates_;
TEST_P(CQTest, LinearPSNRIsHigherForCQLevel) {
const vpx_rational timebase = { 33333333, 1000000000 };
cfg_.g_timebase = timebase;
cfg_.rc_target_bitrate = kCQTargetBitrate;
cfg_.g_lag_in_frames = 25;
cfg_.rc_end_usage = VPX_CQ;
libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
timebase.den, timebase.num, 0, 30);
ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
const double cq_psnr_lin = GetLinearPSNROverBitrate();
const unsigned int cq_actual_bitrate =
static_cast<unsigned int>(file_size()) * 8 * 30 / (n_frames() * 1000);
EXPECT_LE(cq_actual_bitrate, kCQTargetBitrate);
bitrates_[cq_level()] = cq_actual_bitrate;
// try targeting the approximate same bitrate with VBR mode
cfg_.rc_end_usage = VPX_VBR;
cfg_.rc_target_bitrate = cq_actual_bitrate;
ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
const double vbr_psnr_lin = GetLinearPSNROverBitrate();
EXPECT_GE(cq_psnr_lin, vbr_psnr_lin);
}
VP8_INSTANTIATE_TEST_SUITE(CQTest, ::testing::Range(kCQLevelMin, kCQLevelMax,
kCQLevelStep));
} // namespace
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