Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

modules/video_coding/timing.cc

@@ -0,0 +1,318 @@
+/*
+ *  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/modules/video_coding/timing.h"
+
+#include <algorithm>
+
+#include "webrtc/modules/video_coding/internal_defines.h"
+#include "webrtc/modules/video_coding/jitter_buffer_common.h"
+#include "webrtc/system_wrappers/include/clock.h"
+#include "webrtc/system_wrappers/include/metrics.h"
+#include "webrtc/system_wrappers/include/timestamp_extrapolator.h"
+
+namespace webrtc {
+
+VCMTiming::VCMTiming(Clock* clock, VCMTiming* master_timing)
+    : clock_(clock),
+      master_(false),
+      ts_extrapolator_(),
+      codec_timer_(new VCMCodecTimer()),
+      render_delay_ms_(kDefaultRenderDelayMs),
+      min_playout_delay_ms_(0),
+      max_playout_delay_ms_(10000),
+      jitter_delay_ms_(0),
+      current_delay_ms_(0),
+      last_decode_ms_(0),
+      prev_frame_timestamp_(0),
+      timing_frame_info_(),
+      num_decoded_frames_(0),
+      num_delayed_decoded_frames_(0),
+      first_decoded_frame_ms_(-1),
+      sum_missed_render_deadline_ms_(0) {
+  if (master_timing == NULL) {
+    master_ = true;
+    ts_extrapolator_ = new TimestampExtrapolator(clock_->TimeInMilliseconds());
+  } else {
+    ts_extrapolator_ = master_timing->ts_extrapolator_;
+  }
+}
+
+VCMTiming::~VCMTiming() {
+  UpdateHistograms();
+  if (master_) {
+    delete ts_extrapolator_;
+  }
+}
+
+void VCMTiming::UpdateHistograms() const {
+  rtc::CritScope cs(&crit_sect_);
+  if (num_decoded_frames_ == 0) {
+    return;
+  }
+  int64_t elapsed_sec =
+      (clock_->TimeInMilliseconds() - first_decoded_frame_ms_) / 1000;
+  if (elapsed_sec < metrics::kMinRunTimeInSeconds) {
+    return;
+  }
+  RTC_HISTOGRAM_COUNTS_100(
+      "WebRTC.Video.DecodedFramesPerSecond",
+      static_cast<int>((num_decoded_frames_ / elapsed_sec) + 0.5f));
+  RTC_HISTOGRAM_PERCENTAGE(
+      "WebRTC.Video.DelayedFramesToRenderer",
+      num_delayed_decoded_frames_ * 100 / num_decoded_frames_);
+  if (num_delayed_decoded_frames_ > 0) {
+    RTC_HISTOGRAM_COUNTS_1000(
+        "WebRTC.Video.DelayedFramesToRenderer_AvgDelayInMs",
+        sum_missed_render_deadline_ms_ / num_delayed_decoded_frames_);
+  }
+}
+
+void VCMTiming::Reset() {
+  rtc::CritScope cs(&crit_sect_);
+  ts_extrapolator_->Reset(clock_->TimeInMilliseconds());
+  codec_timer_.reset(new VCMCodecTimer());
+  render_delay_ms_ = kDefaultRenderDelayMs;
+  min_playout_delay_ms_ = 0;
+  jitter_delay_ms_ = 0;
+  current_delay_ms_ = 0;
+  prev_frame_timestamp_ = 0;
+}
+
+void VCMTiming::ResetDecodeTime() {
+  rtc::CritScope cs(&crit_sect_);
+  codec_timer_.reset(new VCMCodecTimer());
+}
+
+void VCMTiming::set_render_delay(int render_delay_ms) {
+  rtc::CritScope cs(&crit_sect_);
+  render_delay_ms_ = render_delay_ms;
+}
+
+void VCMTiming::set_min_playout_delay(int min_playout_delay_ms) {
+  rtc::CritScope cs(&crit_sect_);
+  min_playout_delay_ms_ = min_playout_delay_ms;
+}
+
+int VCMTiming::min_playout_delay() {
+  rtc::CritScope cs(&crit_sect_);
+  return min_playout_delay_ms_;
+}
+
+void VCMTiming::set_max_playout_delay(int max_playout_delay_ms) {
+  rtc::CritScope cs(&crit_sect_);
+  max_playout_delay_ms_ = max_playout_delay_ms;
+}
+
+int VCMTiming::max_playout_delay() {
+  rtc::CritScope cs(&crit_sect_);
+  return max_playout_delay_ms_;
+}
+
+void VCMTiming::SetJitterDelay(int jitter_delay_ms) {
+  rtc::CritScope cs(&crit_sect_);
+  if (jitter_delay_ms != jitter_delay_ms_) {
+    jitter_delay_ms_ = jitter_delay_ms;
+    // When in initial state, set current delay to minimum delay.
+    if (current_delay_ms_ == 0) {
+      current_delay_ms_ = jitter_delay_ms_;
+    }
+  }
+}
+
+void VCMTiming::UpdateCurrentDelay(uint32_t frame_timestamp) {
+  rtc::CritScope cs(&crit_sect_);
+  int target_delay_ms = TargetDelayInternal();
+
+  if (current_delay_ms_ == 0) {
+    // Not initialized, set current delay to target.
+    current_delay_ms_ = target_delay_ms;
+  } else if (target_delay_ms != current_delay_ms_) {
+    int64_t delay_diff_ms =
+        static_cast<int64_t>(target_delay_ms) - current_delay_ms_;
+    // Never change the delay with more than 100 ms every second. If we're
+    // changing the delay in too large steps we will get noticeable freezes. By
+    // limiting the change we can increase the delay in smaller steps, which
+    // will be experienced as the video is played in slow motion. When lowering
+    // the delay the video will be played at a faster pace.
+    int64_t max_change_ms = 0;
+    if (frame_timestamp < 0x0000ffff && prev_frame_timestamp_ > 0xffff0000) {
+      // wrap
+      max_change_ms = kDelayMaxChangeMsPerS *
+                      (frame_timestamp + (static_cast<int64_t>(1) << 32) -
+                       prev_frame_timestamp_) /
+                      90000;
+    } else {
+      max_change_ms = kDelayMaxChangeMsPerS *
+                      (frame_timestamp - prev_frame_timestamp_) / 90000;
+    }
+
+    if (max_change_ms <= 0) {
+      // Any changes less than 1 ms are truncated and
+      // will be postponed. Negative change will be due
+      // to reordering and should be ignored.
+      return;
+    }
+    delay_diff_ms = std::max(delay_diff_ms, -max_change_ms);
+    delay_diff_ms = std::min(delay_diff_ms, max_change_ms);
+
+    current_delay_ms_ = current_delay_ms_ + delay_diff_ms;
+  }
+  prev_frame_timestamp_ = frame_timestamp;
+}
+
+void VCMTiming::UpdateCurrentDelay(int64_t render_time_ms,
+                                   int64_t actual_decode_time_ms) {
+  rtc::CritScope cs(&crit_sect_);
+  uint32_t target_delay_ms = TargetDelayInternal();
+  int64_t delayed_ms =
+      actual_decode_time_ms -
+      (render_time_ms - RequiredDecodeTimeMs() - render_delay_ms_);
+  if (delayed_ms < 0) {
+    return;
+  }
+  if (current_delay_ms_ + delayed_ms <= target_delay_ms) {
+    current_delay_ms_ += delayed_ms;
+  } else {
+    current_delay_ms_ = target_delay_ms;
+  }
+}
+
+int32_t VCMTiming::StopDecodeTimer(uint32_t time_stamp,
+                                   int32_t decode_time_ms,
+                                   int64_t now_ms,
+                                   int64_t render_time_ms) {
+  rtc::CritScope cs(&crit_sect_);
+  codec_timer_->AddTiming(decode_time_ms, now_ms);
+  assert(decode_time_ms >= 0);
+  last_decode_ms_ = decode_time_ms;
+
+  // Update stats.
+  ++num_decoded_frames_;
+  if (num_decoded_frames_ == 1) {
+    first_decoded_frame_ms_ = now_ms;
+  }
+  int time_until_rendering_ms = render_time_ms - render_delay_ms_ - now_ms;
+  if (time_until_rendering_ms < 0) {
+    sum_missed_render_deadline_ms_ += -time_until_rendering_ms;
+    ++num_delayed_decoded_frames_;
+  }
+  return 0;
+}
+
+void VCMTiming::IncomingTimestamp(uint32_t time_stamp, int64_t now_ms) {
+  rtc::CritScope cs(&crit_sect_);
+  ts_extrapolator_->Update(now_ms, time_stamp);
+}
+
+int64_t VCMTiming::RenderTimeMs(uint32_t frame_timestamp,
+                                int64_t now_ms) const {
+  rtc::CritScope cs(&crit_sect_);
+  const int64_t render_time_ms = RenderTimeMsInternal(frame_timestamp, now_ms);
+  return render_time_ms;
+}
+
+int64_t VCMTiming::RenderTimeMsInternal(uint32_t frame_timestamp,
+                                        int64_t now_ms) const {
+  int64_t estimated_complete_time_ms =
+      ts_extrapolator_->ExtrapolateLocalTime(frame_timestamp);
+  if (estimated_complete_time_ms == -1) {
+    estimated_complete_time_ms = now_ms;
+  }
+
+  if (min_playout_delay_ms_ == 0 && max_playout_delay_ms_ == 0) {
+    // Render as soon as possible
+    return now_ms;
+  }
+
+  // Make sure the actual delay stays in the range of |min_playout_delay_ms_|
+  // and |max_playout_delay_ms_|.
+  int actual_delay = std::max(current_delay_ms_, min_playout_delay_ms_);
+  actual_delay = std::min(actual_delay, max_playout_delay_ms_);
+  return estimated_complete_time_ms + actual_delay;
+}
+
+// Must be called from inside a critical section.
+int VCMTiming::RequiredDecodeTimeMs() const {
+  const int decode_time_ms = codec_timer_->RequiredDecodeTimeMs();
+  assert(decode_time_ms >= 0);
+  return decode_time_ms;
+}
+
+uint32_t VCMTiming::MaxWaitingTime(int64_t render_time_ms,
+                                   int64_t now_ms) const {
+  rtc::CritScope cs(&crit_sect_);
+
+  const int64_t max_wait_time_ms =
+      render_time_ms - now_ms - RequiredDecodeTimeMs() - render_delay_ms_;
+
+  if (max_wait_time_ms < 0) {
+    return 0;
+  }
+  return static_cast<uint32_t>(max_wait_time_ms);
+}
+
+bool VCMTiming::EnoughTimeToDecode(
+    uint32_t available_processing_time_ms) const {
+  rtc::CritScope cs(&crit_sect_);
+  int64_t required_decode_time_ms = RequiredDecodeTimeMs();
+  if (required_decode_time_ms < 0) {
+    // Haven't decoded any frames yet, try decoding one to get an estimate
+    // of the decode time.
+    return true;
+  } else if (required_decode_time_ms == 0) {
+    // Decode time is less than 1, set to 1 for now since
+    // we don't have any better precision. Count ticks later?
+    required_decode_time_ms = 1;
+  }
+  return static_cast<int64_t>(available_processing_time_ms) -
+             required_decode_time_ms >
+         0;
+}
+
+int VCMTiming::TargetVideoDelay() const {
+  rtc::CritScope cs(&crit_sect_);
+  return TargetDelayInternal();
+}
+
+int VCMTiming::TargetDelayInternal() const {
+  return std::max(min_playout_delay_ms_,
+                  jitter_delay_ms_ + RequiredDecodeTimeMs() + render_delay_ms_);
+}
+
+bool VCMTiming::GetTimings(int* decode_ms,
+                           int* max_decode_ms,
+                           int* current_delay_ms,
+                           int* target_delay_ms,
+                           int* jitter_buffer_ms,
+                           int* min_playout_delay_ms,
+                           int* render_delay_ms) const {
+  rtc::CritScope cs(&crit_sect_);
+  *decode_ms = last_decode_ms_;
+  *max_decode_ms = RequiredDecodeTimeMs();
+  *current_delay_ms = current_delay_ms_;
+  *target_delay_ms = TargetDelayInternal();
+  *jitter_buffer_ms = jitter_delay_ms_;
+  *min_playout_delay_ms = min_playout_delay_ms_;
+  *render_delay_ms = render_delay_ms_;
+  return (num_decoded_frames_ > 0);
+}
+
+void VCMTiming::SetTimingFrameInfo(const TimingFrameInfo& info) {
+  rtc::CritScope cs(&crit_sect_);
+  timing_frame_info_.emplace(info);
+}
+
+rtc::Optional<TimingFrameInfo> VCMTiming::GetTimingFrameInfo() {
+  rtc::CritScope cs(&crit_sect_);
+  return timing_frame_info_;
+}
+
+}  // namespace webrtc