170 lines
5.7 KiB
C++
170 lines
5.7 KiB
C++
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/*
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* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "test/encode_test_driver.h"
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#include "test/i420_video_source.h"
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#include "third_party/googletest/src/include/gtest/gtest.h"
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namespace {
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class DatarateTest : public ::libvpx_test::EncoderTest,
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public ::testing::TestWithParam<enum libvpx_test::TestMode> {
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protected:
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virtual void SetUp() {
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InitializeConfig();
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SetMode(GetParam());
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ResetModel();
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}
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virtual void ResetModel() {
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last_pts_ = 0;
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bits_in_buffer_model_ = cfg_.rc_target_bitrate * cfg_.rc_buf_initial_sz;
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frame_number_ = 0;
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first_drop_ = 0;
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bits_total_ = 0;
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duration_ = 0.0;
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}
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virtual bool Continue() const {
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return !HasFatalFailure() && !abort_;
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}
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virtual void PreEncodeFrameHook(::libvpx_test::VideoSource *video,
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::libvpx_test::Encoder *encoder) {
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const vpx_rational_t tb = video->timebase();
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timebase_ = static_cast<double>(tb.num) / tb.den;
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duration_ = 0;
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}
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virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
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// Time since last timestamp = duration.
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vpx_codec_pts_t duration = pkt->data.frame.pts - last_pts_;
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// TODO(jimbankoski): Remove these lines when the issue:
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// http://code.google.com/p/webm/issues/detail?id=496 is fixed.
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// For now the codec assumes buffer starts at starting buffer rate
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// plus one frame's time.
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if (last_pts_ == 0)
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duration = 1;
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// Add to the buffer the bits we'd expect from a constant bitrate server.
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bits_in_buffer_model_ += duration * timebase_ * cfg_.rc_target_bitrate
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* 1000;
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/* Test the buffer model here before subtracting the frame. Do so because
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* the way the leaky bucket model works in libvpx is to allow the buffer to
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* empty - and then stop showing frames until we've got enough bits to
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* show one. */
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ASSERT_GE(bits_in_buffer_model_, 0) << "Buffer Underrun at frame "
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<< pkt->data.frame.pts;
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const int frame_size_in_bits = pkt->data.frame.sz * 8;
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// Subtract from the buffer the bits associated with a played back frame.
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bits_in_buffer_model_ -= frame_size_in_bits;
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// Update the running total of bits for end of test datarate checks.
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bits_total_ += frame_size_in_bits ;
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// If first drop not set and we have a drop set it to this time.
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if (!first_drop_ && duration > 1)
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first_drop_ = last_pts_ + 1;
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// Update the most recent pts.
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last_pts_ = pkt->data.frame.pts;
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// We update this so that we can calculate the datarate minus the last
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// frame encoded in the file.
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bits_in_last_frame_ = frame_size_in_bits;
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++frame_number_;
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}
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virtual void EndPassHook(void) {
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if (bits_total_) {
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const double file_size_in_kb = bits_total_ / 1000; /* bits per kilobit */
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duration_ = (last_pts_ + 1) * timebase_;
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// Effective file datarate includes the time spent prebuffering.
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effective_datarate_ = (bits_total_ - bits_in_last_frame_) / 1000.0
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/ (cfg_.rc_buf_initial_sz / 1000.0 + duration_);
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file_datarate_ = file_size_in_kb / duration_;
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}
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}
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vpx_codec_pts_t last_pts_;
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int bits_in_buffer_model_;
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double timebase_;
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int frame_number_;
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vpx_codec_pts_t first_drop_;
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int64_t bits_total_;
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double duration_;
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double file_datarate_;
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double effective_datarate_;
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int bits_in_last_frame_;
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};
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TEST_P(DatarateTest, BasicBufferModel) {
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cfg_.rc_buf_initial_sz = 500;
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cfg_.rc_dropframe_thresh = 1;
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cfg_.rc_max_quantizer = 56;
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cfg_.rc_end_usage = VPX_CBR;
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// 2 pass cbr datarate control has a bug hidden by the small # of
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// frames selected in this encode. The problem is that even if the buffer is
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// negative we produce a keyframe on a cutscene. Ignoring datarate
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// constraints
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// TODO(jimbankoski): ( Fix when issue
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// http://code.google.com/p/webm/issues/detail?id=495 is addressed. )
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::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
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30, 1, 0, 140);
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for (int i = 70; i < 700; i += 200) {
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cfg_.rc_target_bitrate = i;
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ResetModel();
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ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
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ASSERT_GE(cfg_.rc_target_bitrate, effective_datarate_)
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<< " The datarate for the file exceeds the target!";
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ASSERT_LE(cfg_.rc_target_bitrate, file_datarate_ * 1.3)
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<< " The datarate for the file missed the target!";
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}
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}
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TEST_P(DatarateTest, ChangingDropFrameThresh) {
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cfg_.rc_buf_initial_sz = 500;
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cfg_.rc_max_quantizer = 36;
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cfg_.rc_end_usage = VPX_CBR;
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cfg_.rc_target_bitrate = 200;
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cfg_.kf_mode = VPX_KF_DISABLED;
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const int frame_count = 40;
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::libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
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30, 1, 0, frame_count);
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// Here we check that the first dropped frame gets earlier and earlier
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// as the drop frame threshold is increased.
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const int kDropFrameThreshTestStep = 30;
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vpx_codec_pts_t last_drop = frame_count;
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for (int i = 1; i < 91; i += kDropFrameThreshTestStep) {
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cfg_.rc_dropframe_thresh = i;
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ResetModel();
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ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
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ASSERT_LE(first_drop_, last_drop)
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<< " The first dropped frame for drop_thresh " << i
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<< " > first dropped frame for drop_thresh "
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<< i - kDropFrameThreshTestStep;
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last_drop = first_drop_;
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}
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}
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INSTANTIATE_TEST_CASE_P(AllModes, DatarateTest, ALL_TEST_MODES);
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} // namespace
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