diff --git a/test/datarate_test.cc b/test/datarate_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f2a2031fdbca54b7ed7dbc5b47c198a81dc2e101
--- /dev/null
+++ b/test/datarate_test.cc
@@ -0,0 +1,169 @@
+/*
+ * 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 "test/encode_test_driver.h"
+#include "test/i420_video_source.h"
+#include "third_party/googletest/src/include/gtest/gtest.h"
+namespace {
+
+class DatarateTest : public ::libvpx_test::EncoderTest,
+ public ::testing::TestWithParam<enum libvpx_test::TestMode> {
+ protected:
+ virtual void SetUp() {
+ InitializeConfig();
+ SetMode(GetParam());
+ 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 bool Continue() const {
+ return !HasFatalFailure() && !abort_;
+ }
+
+ 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_ += 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. */
+ ASSERT_GE(bits_in_buffer_model_, 0) << "Buffer Underrun at frame "
+ << pkt->data.frame.pts;
+
+ const int 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_;
+ int 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_;
+ int 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);
+
+ for (int i = 70; i < 700; 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_;
+ }
+}
+
+INSTANTIATE_TEST_CASE_P(AllModes, DatarateTest, ALL_TEST_MODES);
+} // namespace
diff --git a/test/test.mk b/test/test.mk
index caf9a754070b31692ff33939501dee8417d5bd9f..7a11a2793cc0653bbf67994c5662ff4ff46253a3 100644
--- a/test/test.mk
+++ b/test/test.mk
@@ -12,6 +12,7 @@ LIBVPX_TEST_SRCS-yes += video_source.h
LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += altref_test.cc
LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += config_test.cc
LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += cq_test.cc
+LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += datarate_test.cc
LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += encode_test_driver.cc
LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += encode_test_driver.h
LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += error_resilience_test.cc