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.h

@@ -0,0 +1,147 @@
+/*
+ *  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.
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_CODING_TIMING_H_
+#define WEBRTC_MODULES_VIDEO_CODING_TIMING_H_
+
+#include <memory>
+
+#include "webrtc/modules/video_coding/codec_timer.h"
+#include "webrtc/rtc_base/criticalsection.h"
+#include "webrtc/rtc_base/thread_annotations.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class Clock;
+class TimestampExtrapolator;
+
+class VCMTiming {
+ public:
+  // The primary timing component should be passed
+  // if this is the dual timing component.
+  explicit VCMTiming(Clock* clock, VCMTiming* master_timing = NULL);
+  virtual ~VCMTiming();
+
+  // Resets the timing to the initial state.
+  void Reset();
+  void ResetDecodeTime();
+
+  // Set the amount of time needed to render an image. Defaults to 10 ms.
+  void set_render_delay(int render_delay_ms);
+
+  // Set the minimum time the video must be delayed on the receiver to
+  // get the desired jitter buffer level.
+  void SetJitterDelay(int required_delay_ms);
+
+  // Set the minimum playout delay from capture to render in ms.
+  void set_min_playout_delay(int min_playout_delay_ms);
+
+  // Returns the minimum playout delay from capture to render in ms.
+  int min_playout_delay();
+
+  // Set the maximum playout delay from capture to render in ms.
+  void set_max_playout_delay(int max_playout_delay_ms);
+
+  // Returns the maximum playout delay from capture to render in ms.
+  int max_playout_delay();
+
+  // Increases or decreases the current delay to get closer to the target delay.
+  // Calculates how long it has been since the previous call to this function,
+  // and increases/decreases the delay in proportion to the time difference.
+  void UpdateCurrentDelay(uint32_t frame_timestamp);
+
+  // Increases or decreases the current delay to get closer to the target delay.
+  // Given the actual decode time in ms and the render time in ms for a frame,
+  // this function calculates how late the frame is and increases the delay
+  // accordingly.
+  void UpdateCurrentDelay(int64_t render_time_ms,
+                          int64_t actual_decode_time_ms);
+
+  // Stops the decoder timer, should be called when the decoder returns a frame
+  // or when the decoded frame callback is called.
+  int32_t StopDecodeTimer(uint32_t time_stamp,
+                          int32_t decode_time_ms,
+                          int64_t now_ms,
+                          int64_t render_time_ms);
+
+  // Used to report that a frame is passed to decoding. Updates the timestamp
+  // filter which is used to map between timestamps and receiver system time.
+  void IncomingTimestamp(uint32_t time_stamp, int64_t last_packet_time_ms);
+  // Returns the receiver system time when the frame with timestamp
+  // frame_timestamp should be rendered, assuming that the system time currently
+  // is now_ms.
+  virtual int64_t RenderTimeMs(uint32_t frame_timestamp, int64_t now_ms) const;
+
+  // Returns the maximum time in ms that we can wait for a frame to become
+  // complete before we must pass it to the decoder.
+  virtual uint32_t MaxWaitingTime(int64_t render_time_ms, int64_t now_ms) const;
+
+  // Returns the current target delay which is required delay + decode time +
+  // render delay.
+  int TargetVideoDelay() const;
+
+  // Calculates whether or not there is enough time to decode a frame given a
+  // certain amount of processing time.
+  bool EnoughTimeToDecode(uint32_t available_processing_time_ms) const;
+
+  // Return current timing information. Returns true if the first frame has been
+  // decoded, false otherwise.
+  virtual bool 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;
+
+  void SetTimingFrameInfo(const TimingFrameInfo& info);
+  rtc::Optional<TimingFrameInfo> GetTimingFrameInfo();
+
+  enum { kDefaultRenderDelayMs = 10 };
+  enum { kDelayMaxChangeMsPerS = 100 };
+
+ protected:
+  int RequiredDecodeTimeMs() const RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
+  int64_t RenderTimeMsInternal(uint32_t frame_timestamp, int64_t now_ms) const
+      RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
+  int TargetDelayInternal() const RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
+
+ private:
+  void UpdateHistograms() const;
+
+  rtc::CriticalSection crit_sect_;
+  Clock* const clock_;
+  bool master_ RTC_GUARDED_BY(crit_sect_);
+  TimestampExtrapolator* ts_extrapolator_ RTC_GUARDED_BY(crit_sect_);
+  std::unique_ptr<VCMCodecTimer> codec_timer_ RTC_GUARDED_BY(crit_sect_);
+  int render_delay_ms_ RTC_GUARDED_BY(crit_sect_);
+  // Best-effort playout delay range for frames from capture to render.
+  // The receiver tries to keep the delay between |min_playout_delay_ms_|
+  // and |max_playout_delay_ms_| taking the network jitter into account.
+  // A special case is where min_playout_delay_ms_ = max_playout_delay_ms_ = 0,
+  // in which case the receiver tries to play the frames as they arrive.
+  int min_playout_delay_ms_ RTC_GUARDED_BY(crit_sect_);
+  int max_playout_delay_ms_ RTC_GUARDED_BY(crit_sect_);
+  int jitter_delay_ms_ RTC_GUARDED_BY(crit_sect_);
+  int current_delay_ms_ RTC_GUARDED_BY(crit_sect_);
+  int last_decode_ms_ RTC_GUARDED_BY(crit_sect_);
+  uint32_t prev_frame_timestamp_ RTC_GUARDED_BY(crit_sect_);
+  rtc::Optional<TimingFrameInfo> timing_frame_info_ RTC_GUARDED_BY(crit_sect_);
+
+  // Statistics.
+  size_t num_decoded_frames_ RTC_GUARDED_BY(crit_sect_);
+  size_t num_delayed_decoded_frames_ RTC_GUARDED_BY(crit_sect_);
+  int64_t first_decoded_frame_ms_ RTC_GUARDED_BY(crit_sect_);
+  uint64_t sum_missed_render_deadline_ms_ RTC_GUARDED_BY(crit_sect_);
+};
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_CODING_TIMING_H_