ref: ef951d1919521e61401cb16633789b3c15c4800e
dir: /test/datarate_test.cc/
/*
* 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 "./vpx_config.h"
#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"
#include "test/y4m_video_source.h"
namespace {
class DatarateTest : public ::libvpx_test::EncoderTest,
public ::libvpx_test::CodecTestWithParam<libvpx_test::TestMode> {
public:
DatarateTest() : EncoderTest(GET_PARAM(0)) {}
protected:
virtual void SetUp() {
InitializeConfig();
SetMode(GET_PARAM(1));
ResetModel();
}
virtual void ResetModel() {
last_pts_ = 0;
bits_in_buffer_model_ = cfg_.rc_target_bitrate * cfg_.rc_buf_initial_sz;
frame_number_ = 0;
first_drop_ = 0;
bits_total_ = 0;
duration_ = 0.0;
}
virtual void PreEncodeFrameHook(::libvpx_test::VideoSource *video,
::libvpx_test::Encoder *encoder) {
const vpx_rational_t tb = video->timebase();
timebase_ = static_cast<double>(tb.num) / tb.den;
duration_ = 0;
}
virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
// Time since last timestamp = duration.
vpx_codec_pts_t duration = pkt->data.frame.pts - last_pts_;
// TODO(jimbankoski): Remove these lines when the issue:
// http://code.google.com/p/webm/issues/detail?id=496 is fixed.
// For now the codec assumes buffer starts at starting buffer rate
// plus one frame's time.
if (last_pts_ == 0)
duration = 1;
// Add to the buffer the bits we'd expect from a constant bitrate server.
bits_in_buffer_model_ += static_cast<int64_t>(
duration * timebase_ * cfg_.rc_target_bitrate * 1000);
/* Test the buffer model here before subtracting the frame. Do so because
* the way the leaky bucket model works in libvpx is to allow the buffer to
* empty - and then stop showing frames until we've got enough bits to
* show one. As noted in comment below (issue 495), this does not currently
* apply to key frames. For now exclude key frames in condition below. */
const bool key_frame = (pkt->data.frame.flags & VPX_FRAME_IS_KEY)
? true: false;
if (!key_frame) {
ASSERT_GE(bits_in_buffer_model_, 0) << "Buffer Underrun at frame "
<< pkt->data.frame.pts;
}
const size_t frame_size_in_bits = pkt->data.frame.sz * 8;
// Subtract from the buffer the bits associated with a played back frame.
bits_in_buffer_model_ -= frame_size_in_bits;
// Update the running total of bits for end of test datarate checks.
bits_total_ += frame_size_in_bits;
// If first drop not set and we have a drop set it to this time.
if (!first_drop_ && duration > 1)
first_drop_ = last_pts_ + 1;
// Update the most recent pts.
last_pts_ = pkt->data.frame.pts;
// We update this so that we can calculate the datarate minus the last
// frame encoded in the file.
bits_in_last_frame_ = frame_size_in_bits;
++frame_number_;
}
virtual void EndPassHook(void) {
if (bits_total_) {
const double file_size_in_kb = bits_total_ / 1000.; // bits per kilobit
duration_ = (last_pts_ + 1) * timebase_;
// Effective file datarate includes the time spent prebuffering.
effective_datarate_ = (bits_total_ - bits_in_last_frame_) / 1000.0
/ (cfg_.rc_buf_initial_sz / 1000.0 + duration_);
file_datarate_ = file_size_in_kb / duration_;
}
}
vpx_codec_pts_t last_pts_;
int64_t bits_in_buffer_model_;
double timebase_;
int frame_number_;
vpx_codec_pts_t first_drop_;
int64_t bits_total_;
double duration_;
double file_datarate_;
double effective_datarate_;
size_t bits_in_last_frame_;
};
TEST_P(DatarateTest, BasicBufferModel) {
cfg_.rc_buf_initial_sz = 500;
cfg_.rc_dropframe_thresh = 1;
cfg_.rc_max_quantizer = 56;
cfg_.rc_end_usage = VPX_CBR;
// 2 pass cbr datarate control has a bug hidden by the small # of
// frames selected in this encode. The problem is that even if the buffer is
// negative we produce a keyframe on a cutscene. Ignoring datarate
// constraints
// TODO(jimbankoski): ( Fix when issue
// http://code.google.com/p/webm/issues/detail?id=495 is addressed. )
::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
30, 1, 0, 140);
// There is an issue for low bitrates in real-time mode, where the
// effective_datarate slightly overshoots the target bitrate.
// This is same the issue as noted about (#495).
// TODO(jimbankoski/marpan): Update test to run for lower bitrates (< 100),
// when the issue is resolved.
for (int i = 100; i < 800; i += 200) {
cfg_.rc_target_bitrate = i;
ResetModel();
ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
ASSERT_GE(cfg_.rc_target_bitrate, effective_datarate_)
<< " The datarate for the file exceeds the target!";
ASSERT_LE(cfg_.rc_target_bitrate, file_datarate_ * 1.3)
<< " The datarate for the file missed the target!";
}
}
TEST_P(DatarateTest, ChangingDropFrameThresh) {
cfg_.rc_buf_initial_sz = 500;
cfg_.rc_max_quantizer = 36;
cfg_.rc_end_usage = VPX_CBR;
cfg_.rc_target_bitrate = 200;
cfg_.kf_mode = VPX_KF_DISABLED;
const int frame_count = 40;
::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
30, 1, 0, frame_count);
// Here we check that the first dropped frame gets earlier and earlier
// as the drop frame threshold is increased.
const int kDropFrameThreshTestStep = 30;
vpx_codec_pts_t last_drop = frame_count;
for (int i = 1; i < 91; i += kDropFrameThreshTestStep) {
cfg_.rc_dropframe_thresh = i;
ResetModel();
ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
ASSERT_LE(first_drop_, last_drop)
<< " The first dropped frame for drop_thresh " << i
<< " > first dropped frame for drop_thresh "
<< i - kDropFrameThreshTestStep;
last_drop = first_drop_;
}
}
class DatarateTestVP9 : public ::libvpx_test::EncoderTest,
public ::libvpx_test::CodecTestWith2Params<libvpx_test::TestMode, int> {
public:
DatarateTestVP9() : EncoderTest(GET_PARAM(0)) {}
protected:
virtual ~DatarateTestVP9() {}
virtual void SetUp() {
InitializeConfig();
SetMode(GET_PARAM(1));
set_cpu_used_ = GET_PARAM(2);
ResetModel();
}
virtual void ResetModel() {
last_pts_ = 0;
bits_in_buffer_model_ = cfg_.rc_target_bitrate * cfg_.rc_buf_initial_sz;
frame_number_ = 0;
first_drop_ = 0;
num_drops_ = 0;
bits_total_ = 0;
duration_ = 0.0;
}
virtual void PreEncodeFrameHook(::libvpx_test::VideoSource *video,
::libvpx_test::Encoder *encoder) {
if (video->frame() == 1) {
encoder->Control(VP8E_SET_CPUUSED, set_cpu_used_);
}
const vpx_rational_t tb = video->timebase();
timebase_ = static_cast<double>(tb.num) / tb.den;
duration_ = 0;
}
virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
// Time since last timestamp = duration.
vpx_codec_pts_t duration = pkt->data.frame.pts - last_pts_;
// Add to the buffer the bits we'd expect from a constant bitrate server.
bits_in_buffer_model_ += static_cast<int64_t>(
duration * timebase_ * cfg_.rc_target_bitrate * 1000);
// Buffer should not go negative.
ASSERT_GE(bits_in_buffer_model_, 0) << "Buffer Underrun at frame "
<< pkt->data.frame.pts;
const size_t frame_size_in_bits = pkt->data.frame.sz * 8;
bits_total_ += frame_size_in_bits;
// If first drop not set and we have a drop set it to this time.
if (!first_drop_ && duration > 1)
first_drop_ = last_pts_ + 1;
// Update the number of frame drops.
if (duration > 1) {
num_drops_ += static_cast<int>(duration - 1);
}
// Update the most recent pts.
last_pts_ = pkt->data.frame.pts;
++frame_number_;
}
virtual void EndPassHook(void) {
if (bits_total_) {
duration_ = (last_pts_ + 1) * timebase_;
// Effective file datarate:
effective_datarate_ = ((bits_total_) / 1000.0) / duration_;
}
}
vpx_codec_pts_t last_pts_;
double timebase_;
int frame_number_;
int64_t bits_total_;
double duration_;
double effective_datarate_;
int set_cpu_used_;
int64_t bits_in_buffer_model_;
vpx_codec_pts_t first_drop_;
int num_drops_;
};
// Check basic rate targeting,
TEST_P(DatarateTestVP9, BasicRateTargeting) {
cfg_.rc_buf_initial_sz = 500;
cfg_.rc_buf_optimal_sz = 500;
cfg_.rc_buf_sz = 1000;
cfg_.rc_dropframe_thresh = 1;
cfg_.rc_min_quantizer = 0;
cfg_.rc_max_quantizer = 63;
cfg_.rc_end_usage = VPX_CBR;
::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
30, 1, 0, 140);
for (int i = 150; i < 800; i += 200) {
cfg_.rc_target_bitrate = i;
ResetModel();
ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
ASSERT_GE(static_cast<double>(cfg_.rc_target_bitrate),
effective_datarate_ * 0.85)
<< " The datarate for the file exceeds the target by too much!";
ASSERT_LE(static_cast<double>(cfg_.rc_target_bitrate),
effective_datarate_ * 1.15)
<< " The datarate for the file missed the target!";
}
}
#if CONFIG_NON420
// Check basic rate targeting,
TEST_P(DatarateTestVP9, BasicRateTargeting444) {
::libvpx_test::Y4mVideoSource video("rush_hour_444.y4m", 0, 140);
cfg_.g_profile = 1;
cfg_.g_timebase = video.timebase();
cfg_.rc_buf_initial_sz = 500;
cfg_.rc_buf_optimal_sz = 500;
cfg_.rc_buf_sz = 1000;
cfg_.rc_dropframe_thresh = 1;
cfg_.rc_min_quantizer = 0;
cfg_.rc_max_quantizer = 63;
cfg_.rc_end_usage = VPX_CBR;
for (int i = 250; i < 900; i += 200) {
cfg_.rc_target_bitrate = i;
ResetModel();
ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
ASSERT_GE(static_cast<double>(cfg_.rc_target_bitrate),
effective_datarate_ * 0.85)
<< " The datarate for the file exceeds the target by too much!";
ASSERT_LE(static_cast<double>(cfg_.rc_target_bitrate),
effective_datarate_ * 1.15)
<< " The datarate for the file missed the target!"
<< cfg_.rc_target_bitrate << " "<< effective_datarate_;
}
}
#endif
// Check that (1) the first dropped frame gets earlier and earlier
// as the drop frame threshold is increased, and (2) that the total number of
// frame drops does not decrease as we increase frame drop threshold.
// Use a lower qp-max to force some frame drops.
TEST_P(DatarateTestVP9, ChangingDropFrameThresh) {
cfg_.rc_buf_initial_sz = 500;
cfg_.rc_buf_optimal_sz = 500;
cfg_.rc_buf_sz = 1000;
cfg_.rc_undershoot_pct = 20;
cfg_.rc_undershoot_pct = 20;
cfg_.rc_dropframe_thresh = 10;
cfg_.rc_min_quantizer = 0;
cfg_.rc_max_quantizer = 50;
cfg_.rc_end_usage = VPX_CBR;
cfg_.rc_target_bitrate = 200;
::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
30, 1, 0, 140);
const int kDropFrameThreshTestStep = 30;
vpx_codec_pts_t last_drop = 140;
int last_num_drops = 0;
for (int i = 10; i < 100; i += kDropFrameThreshTestStep) {
cfg_.rc_dropframe_thresh = i;
ResetModel();
ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
ASSERT_GE(effective_datarate_, cfg_.rc_target_bitrate * 0.85)
<< " The datarate for the file is lower than target by too much!";
ASSERT_LE(effective_datarate_, cfg_.rc_target_bitrate * 1.15)
<< " The datarate for the file is greater than target by too much!";
ASSERT_LE(first_drop_, last_drop)
<< " The first dropped frame for drop_thresh " << i
<< " > first dropped frame for drop_thresh "
<< i - kDropFrameThreshTestStep;
ASSERT_GE(num_drops_, last_num_drops)
<< " The number of dropped frames for drop_thresh " << i
<< " < number of dropped frames for drop_thresh "
<< i - kDropFrameThreshTestStep;
last_drop = first_drop_;
last_num_drops = num_drops_;
}
}
VP8_INSTANTIATE_TEST_CASE(DatarateTest, ALL_TEST_MODES);
VP9_INSTANTIATE_TEST_CASE(DatarateTestVP9,
::testing::Values(::libvpx_test::kOnePassGood),
::testing::Range(1, 5));
} // namespace