modules/video_processing: refactor interface->include + more.

webrtc/modules/video_processing/main/source/video_decimator.cc

-/*
- *  Copyright (c) 2011 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/base/checks.h"
-#include "webrtc/modules/video_processing/main/interface/video_processing.h"
-#include "webrtc/modules/video_processing/main/source/video_decimator.h"
-#include "webrtc/system_wrappers/include/tick_util.h"
-
-#define VD_MIN(a, b) ((a) < (b)) ? (a) : (b)
-
-namespace webrtc {
-
-VPMVideoDecimator::VPMVideoDecimator() {
-  Reset();
-}
-
-VPMVideoDecimator::~VPMVideoDecimator() {}
-
-void VPMVideoDecimator::Reset()  {
-  overshoot_modifier_ = 0;
-  drop_count_ = 0;
-  keep_count_ = 0;
-  target_frame_rate_ = 30;
-  incoming_frame_rate_ = 0.0f;
-  memset(incoming_frame_times_, 0, sizeof(incoming_frame_times_));
-  enable_temporal_decimation_ = true;
-}
-
-void VPMVideoDecimator::EnableTemporalDecimation(bool enable) {
-  enable_temporal_decimation_ = enable;
-}
-
-void VPMVideoDecimator::SetTargetFramerate(int frame_rate) {
-  RTC_DCHECK(frame_rate);
-  target_frame_rate_ = frame_rate;
-}
-
-bool VPMVideoDecimator::DropFrame() {
-  if (!enable_temporal_decimation_) return false;
-
-  if (incoming_frame_rate_ <= 0) return false;
-
-  const uint32_t incomingframe_rate =
-      static_cast<uint32_t>(incoming_frame_rate_ + 0.5f);
-
-  if (target_frame_rate_ == 0) return true;
-
-  bool drop = false;
-  if (incomingframe_rate > target_frame_rate_) {
-    int32_t overshoot =
-        overshoot_modifier_ + (incomingframe_rate - target_frame_rate_);
-    if (overshoot < 0) {
-      overshoot = 0;
-      overshoot_modifier_ = 0;
-    }
-
-    if (overshoot && 2 * overshoot < (int32_t) incomingframe_rate) {
-      if (drop_count_) {  // Just got here so drop to be sure.
-          drop_count_ = 0;
-          return true;
-      }
-      const uint32_t dropVar = incomingframe_rate / overshoot;
-
-      if (keep_count_ >= dropVar) {
-          drop = true;
-          overshoot_modifier_ = -((int32_t) incomingframe_rate % overshoot) / 3;
-          keep_count_ = 1;
-      } else {
-          keep_count_++;
-      }
-    } else {
-      keep_count_ = 0;
-      const uint32_t dropVar = overshoot / target_frame_rate_;
-      if (drop_count_ < dropVar) {
-          drop = true;
-          drop_count_++;
-      } else {
-          overshoot_modifier_ = overshoot % target_frame_rate_;
-          drop = false;
-          drop_count_ = 0;
-      }
-    }
-  }
-  return drop;
-}
-
-
-uint32_t VPMVideoDecimator::Decimatedframe_rate() {
-ProcessIncomingframe_rate(TickTime::MillisecondTimestamp());
-  if (!enable_temporal_decimation_) {
-    return static_cast<uint32_t>(incoming_frame_rate_ + 0.5f);
-  }
-  return VD_MIN(target_frame_rate_,
-      static_cast<uint32_t>(incoming_frame_rate_ + 0.5f));
-}
-
-uint32_t VPMVideoDecimator::Inputframe_rate() {
-  ProcessIncomingframe_rate(TickTime::MillisecondTimestamp());
-  return static_cast<uint32_t>(incoming_frame_rate_ + 0.5f);
-}
-
-void VPMVideoDecimator::UpdateIncomingframe_rate() {
-  int64_t now = TickTime::MillisecondTimestamp();
-  if (incoming_frame_times_[0] == 0) {
-    // First no shift.
-  } else {
-    // Shift.
-    for (int i = kFrameCountHistory_size - 2; i >= 0; i--) {
-        incoming_frame_times_[i+1] = incoming_frame_times_[i];
-    }
-  }
-  incoming_frame_times_[0] = now;
-  ProcessIncomingframe_rate(now);
-}
-
-void VPMVideoDecimator::ProcessIncomingframe_rate(int64_t now) {
-  int32_t num = 0;
-  int32_t nrOfFrames = 0;
-  for (num = 1; num < (kFrameCountHistory_size - 1); num++) {
-    // Don't use data older than 2sec.
-    if (incoming_frame_times_[num] <= 0 ||
-        now - incoming_frame_times_[num] > kFrameHistoryWindowMs) {
-      break;
-    } else {
-      nrOfFrames++;
-    }
-  }
-  if (num > 1) {
-    int64_t diff = now - incoming_frame_times_[num-1];
-    incoming_frame_rate_ = 1.0;
-    if (diff > 0) {
-      incoming_frame_rate_ = nrOfFrames * 1000.0f / static_cast<float>(diff);
-    }
-  } else {
-    incoming_frame_rate_ = static_cast<float>(nrOfFrames);
-  }
-}
-
-}  // namespace webrtc