modules/video_coding refactorings

webrtc/modules/video_coding/main/source/content_metrics_processing.cc

-/*
- *  Copyright (c) 2012 The WebRTC 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 "webrtc/modules/video_coding/main/source/content_metrics_processing.h"
-
-#include <math.h>
-
-#include "webrtc/modules/include/module_common_types.h"
-#include "webrtc/modules/video_coding/main/interface/video_coding_defines.h"
-
-namespace webrtc {
-//////////////////////////////////
-/// VCMContentMetricsProcessing //
-//////////////////////////////////
-
-VCMContentMetricsProcessing::VCMContentMetricsProcessing()
-    : recursive_avg_factor_(1 / 150.0f),  // matched to  30fps.
-      frame_cnt_uniform_avg_(0),
-      avg_motion_level_(0.0f),
-      avg_spatial_level_(0.0f) {
-  recursive_avg_ = new VideoContentMetrics();
-  uniform_avg_ = new VideoContentMetrics();
-}
-
-VCMContentMetricsProcessing::~VCMContentMetricsProcessing() {
-  delete recursive_avg_;
-  delete uniform_avg_;
-}
-
-int VCMContentMetricsProcessing::Reset() {
-  recursive_avg_->Reset();
-  uniform_avg_->Reset();
-  frame_cnt_uniform_avg_ = 0;
-  avg_motion_level_  = 0.0f;
-  avg_spatial_level_ = 0.0f;
-  return VCM_OK;
-}
-
-void VCMContentMetricsProcessing::UpdateFrameRate(uint32_t frameRate) {
-  // Update factor for recursive averaging.
-  recursive_avg_factor_ = static_cast<float> (1000.0f) /
-      static_cast<float>(frameRate *  kQmMinIntervalMs);
-}
-
-VideoContentMetrics* VCMContentMetricsProcessing::LongTermAvgData() {
-  return recursive_avg_;
-}
-
-VideoContentMetrics* VCMContentMetricsProcessing::ShortTermAvgData() {
-  if (frame_cnt_uniform_avg_ == 0) {
-    return NULL;
-  }
-  // Two metrics are used: motion and spatial level.
-  uniform_avg_->motion_magnitude = avg_motion_level_ /
-      static_cast<float>(frame_cnt_uniform_avg_);
-  uniform_avg_->spatial_pred_err = avg_spatial_level_ /
-      static_cast<float>(frame_cnt_uniform_avg_);
-  return uniform_avg_;
-}
-
-void VCMContentMetricsProcessing::ResetShortTermAvgData() {
-  // Reset.
-  avg_motion_level_ = 0.0f;
-  avg_spatial_level_ = 0.0f;
-  frame_cnt_uniform_avg_ = 0;
-}
-
-int VCMContentMetricsProcessing::UpdateContentData(
-    const VideoContentMetrics *contentMetrics) {
-  if (contentMetrics == NULL) {
-    return VCM_OK;
-  }
-  return ProcessContent(contentMetrics);
-}
-
-int VCMContentMetricsProcessing::ProcessContent(
-    const VideoContentMetrics *contentMetrics) {
-  // Update the recursive averaged metrics: average is over longer window
-  // of time: over QmMinIntervalMs ms.
-  UpdateRecursiveAvg(contentMetrics);
-  // Update the uniform averaged metrics: average is over shorter window
-  // of time: based on ~RTCP reports.
-  UpdateUniformAvg(contentMetrics);
-  return VCM_OK;
-}
-
-void VCMContentMetricsProcessing::UpdateUniformAvg(
-    const VideoContentMetrics *contentMetrics) {
-  // Update frame counter.
-  frame_cnt_uniform_avg_ += 1;
-  // Update averaged metrics: motion and spatial level are used.
-  avg_motion_level_ += contentMetrics->motion_magnitude;
-  avg_spatial_level_ +=  contentMetrics->spatial_pred_err;
-  return;
-}
-
-void VCMContentMetricsProcessing::UpdateRecursiveAvg(
-    const VideoContentMetrics *contentMetrics) {
-
-  // Spatial metrics: 2x2, 1x2(H), 2x1(V).
-  recursive_avg_->spatial_pred_err = (1 - recursive_avg_factor_) *
-      recursive_avg_->spatial_pred_err +
-      recursive_avg_factor_ * contentMetrics->spatial_pred_err;
-
-  recursive_avg_->spatial_pred_err_h = (1 - recursive_avg_factor_) *
-      recursive_avg_->spatial_pred_err_h +
-      recursive_avg_factor_ * contentMetrics->spatial_pred_err_h;
-
-  recursive_avg_->spatial_pred_err_v = (1 - recursive_avg_factor_) *
-      recursive_avg_->spatial_pred_err_v +
-      recursive_avg_factor_ * contentMetrics->spatial_pred_err_v;
-
-  // Motion metric: Derived from NFD (normalized frame difference).
-  recursive_avg_->motion_magnitude = (1 - recursive_avg_factor_) *
-      recursive_avg_->motion_magnitude +
-      recursive_avg_factor_ * contentMetrics->motion_magnitude;
-}
-}  // namespace