Move talk/media to webrtc/media

talk/media/base/videoadapter.h

-/*
- * libjingle
- * Copyright 2010 Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *  1. Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright notice,
- *     this list of conditions and the following disclaimer in the documentation
- *     and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef TALK_MEDIA_BASE_VIDEOADAPTER_H_  // NOLINT
-#define TALK_MEDIA_BASE_VIDEOADAPTER_H_
-
-#include "talk/media/base/videocommon.h"
-#include "webrtc/base/common.h"  // For ASSERT
-#include "webrtc/base/criticalsection.h"
-#include "webrtc/base/scoped_ptr.h"
-#include "webrtc/base/sigslot.h"
-
-namespace cricket {
-
-class VideoFrame;
-
-// VideoAdapter adapts an input video frame to an output frame based on the
-// specified input and output formats. The adaptation includes dropping frames
-// to reduce frame rate and scaling frames. VideoAdapter is thread safe.
-class VideoAdapter {
- public:
-  VideoAdapter();
-  virtual ~VideoAdapter();
-
-  virtual void SetInputFormat(const VideoFormat& format);
-  void SetOutputFormat(const VideoFormat& format);
-  // Constrain output resolution to this many pixels overall
-  void SetOutputNumPixels(int num_pixels);
-  int GetOutputNumPixels() const;
-
-  const VideoFormat& input_format();
-  // Returns true if the adapter will always return zero size from
-  // AdaptFrameResolution.
-  bool drops_all_frames() const;
-  const VideoFormat& output_format();
-
-  // Return the adapted resolution given the input resolution. The returned
-  // resolution will be 0x0 if the frame should be dropped.
-  VideoFormat AdaptFrameResolution(int in_width, int in_height);
-
-  void set_scale_third(bool enable);
-  bool scale_third() const { return scale_third_; }
-
-  int adaptation_changes() const { return adaption_changes_; }
-
- protected:
-  float FindClosestScale(int width, int height, int target_num_pixels);
-  float FindClosestViewScale(int width, int height, int target_num_pixels);
-  float FindLowerScale(int width, int height, int target_num_pixels);
-
- private:
-  const float* GetViewScaleFactors() const;
-  float FindScale(const float* scale_factors,
-                  const float upbias, int width, int height,
-                  int target_num_pixels);
-
-  VideoFormat input_format_;
-  VideoFormat output_format_;
-  int output_num_pixels_;
-  bool scale_third_;  // True if adapter allows scaling to 1/3 and 2/3.
-  int frames_in_;  // Number of input frames.
-  int frames_out_;  // Number of output frames.
-  int frames_scaled_;  // Number of frames scaled.
-  int adaption_changes_;  // Number of changes in scale factor.
-  size_t previous_width_;  // Previous adapter output width.
-  size_t previous_height_;  // Previous adapter output height.
-  int64_t interval_next_frame_;
-  // The critical section to protect the above variables.
-  rtc::CriticalSection critical_section_;
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(VideoAdapter);
-};
-
-// CoordinatedVideoAdapter adapts the video input to the encoder by coordinating
-// the format request from the server, the resolution request from the encoder,
-// and the CPU load.
-class CoordinatedVideoAdapter
-    : public VideoAdapter, public sigslot::has_slots<>  {
- public:
-  enum AdaptRequest { UPGRADE, KEEP, DOWNGRADE };
-  enum AdaptReasonEnum {
-    ADAPTREASON_NONE = 0,
-    ADAPTREASON_CPU = 1,
-    ADAPTREASON_BANDWIDTH = 2,
-    ADAPTREASON_VIEW = 4
-  };
-  typedef int AdaptReason;
-
-  CoordinatedVideoAdapter();
-  virtual ~CoordinatedVideoAdapter() {}
-
-  virtual void SetInputFormat(const VideoFormat& format);
-
-  // Enable or disable video adaptation due to the change of the CPU load.
-  void set_cpu_adaptation(bool enable) { cpu_adaptation_ = enable; }
-  bool cpu_adaptation() const { return cpu_adaptation_; }
-  // Enable or disable smoothing when doing CPU adaptation. When smoothing is
-  // enabled, system CPU load is tracked using an exponential weighted
-  // average.
-  void set_cpu_smoothing(bool enable);
-  bool cpu_smoothing() const { return cpu_smoothing_; }
-  // Enable or disable video adaptation due to the change of the GD
-  void set_gd_adaptation(bool enable) { gd_adaptation_ = enable; }
-  bool gd_adaptation() const { return gd_adaptation_; }
-  // Enable or disable video adaptation due to the change of the View
-  void set_view_adaptation(bool enable) { view_adaptation_ = enable; }
-  bool view_adaptation() const { return view_adaptation_; }
-  // Enable or disable video adaptation to fast switch View
-  void set_view_switch(bool enable) { view_switch_ = enable; }
-  bool view_switch() const { return view_switch_; }
-
-  CoordinatedVideoAdapter::AdaptReason adapt_reason() const {
-    return adapt_reason_;
-  }
-
-  // When the video is decreased, set the waiting time for CPU adaptation to
-  // decrease video again.
-  void set_cpu_load_min_samples(int cpu_load_min_samples);
-  int cpu_load_min_samples() const { return cpu_load_min_samples_; }
-  // CPU system load high threshold for reducing resolution.  e.g. 0.85f
-  void set_high_system_threshold(float high_system_threshold);
-  float high_system_threshold() const { return high_system_threshold_; }
-  // CPU system load low threshold for increasing resolution.  e.g. 0.70f
-  void set_low_system_threshold(float low_system_threshold);
-  float low_system_threshold() const { return low_system_threshold_; }
-  // CPU process load threshold for reducing resolution.  e.g. 0.10f
-  void set_process_threshold(float process_threshold);
-  float process_threshold() const { return process_threshold_; }
-
-  // Handle the format request from the server via Jingle update message.
-  void OnOutputFormatRequest(const VideoFormat& format);
-  // Handle the resolution request from the encoder due to bandwidth changes.
-  void OnEncoderResolutionRequest(int width, int height, AdaptRequest request);
-  // Handle the resolution request for CPU overuse.
-  void OnCpuResolutionRequest(AdaptRequest request);
-  // Handle the CPU load provided by a CPU monitor.
-  void OnCpuLoadUpdated(int current_cpus, int max_cpus,
-                        float process_load, float system_load);
-
-  sigslot::signal0<> SignalCpuAdaptationUnable;
-
- private:
-  // Adapt to the minimum of the formats the server requests, the CPU wants, and
-  // the encoder wants. Returns true if resolution changed.
-  bool AdaptToMinimumFormat(int* new_width, int* new_height);
-  bool IsMinimumFormat(int pixels);
-  void StepPixelCount(CoordinatedVideoAdapter::AdaptRequest request,
-                      int* num_pixels);
-  CoordinatedVideoAdapter::AdaptRequest FindCpuRequest(
-    int current_cpus, int max_cpus,
-    float process_load, float system_load);
-
-  bool cpu_adaptation_;  // True if cpu adaptation is enabled.
-  bool cpu_smoothing_;  // True if cpu smoothing is enabled (with adaptation).
-  bool gd_adaptation_;  // True if gd adaptation is enabled.
-  bool view_adaptation_;  // True if view adaptation is enabled.
-  bool view_switch_;  // True if view switch is enabled.
-  int cpu_downgrade_count_;
-  int cpu_load_min_samples_;
-  int cpu_load_num_samples_;
-  // cpu system load thresholds relative to max cpus.
-  float high_system_threshold_;
-  float low_system_threshold_;
-  // cpu process load thresholds relative to current cpus.
-  float process_threshold_;
-  // Video formats that the server view requests, the CPU wants, and the encoder
-  // wants respectively. The adapted output format is the minimum of these.
-  int view_desired_num_pixels_;
-  int64_t view_desired_interval_;
-  int encoder_desired_num_pixels_;
-  int cpu_desired_num_pixels_;
-  CoordinatedVideoAdapter::AdaptReason adapt_reason_;
-  // The critical section to protect handling requests.
-  rtc::CriticalSection request_critical_section_;
-
-  // The weighted average of cpu load over time. It's always updated (if cpu
-  // adaptation is on), but only used if cpu_smoothing_ is set.
-  float system_load_average_;
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(CoordinatedVideoAdapter);
-};
-
-}  // namespace cricket
-
-#endif  // TALK_MEDIA_BASE_VIDEOADAPTER_H_  // NOLINT