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      1 /*
      2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef WEBRTC_VIDEO_VIDEO_CAPTURE_INPUT_H_
     12 #define WEBRTC_VIDEO_VIDEO_CAPTURE_INPUT_H_
     13 
     14 #include <vector>
     15 
     16 #include "webrtc/base/criticalsection.h"
     17 #include "webrtc/base/event.h"
     18 #include "webrtc/base/platform_thread.h"
     19 #include "webrtc/base/scoped_ptr.h"
     20 #include "webrtc/base/thread_annotations.h"
     21 #include "webrtc/common_types.h"
     22 #include "webrtc/engine_configurations.h"
     23 #include "webrtc/modules/video_capture/video_capture.h"
     24 #include "webrtc/modules/video_coding/include/video_codec_interface.h"
     25 #include "webrtc/modules/video_coding/include/video_coding.h"
     26 #include "webrtc/modules/video_processing/include/video_processing.h"
     27 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
     28 #include "webrtc/typedefs.h"
     29 #include "webrtc/video_send_stream.h"
     30 
     31 namespace webrtc {
     32 
     33 class Config;
     34 class CpuOveruseMetricsObserver;
     35 class CpuOveruseObserver;
     36 class CriticalSectionWrapper;
     37 class OveruseFrameDetector;
     38 class ProcessThread;
     39 class RegistrableCpuOveruseMetricsObserver;
     40 class SendStatisticsProxy;
     41 class VideoRenderer;
     42 
     43 class VideoCaptureCallback {
     44  public:
     45   virtual ~VideoCaptureCallback() {}
     46 
     47   virtual void DeliverFrame(VideoFrame video_frame) = 0;
     48 };
     49 
     50 namespace internal {
     51 class VideoCaptureInput : public webrtc::VideoCaptureInput {
     52  public:
     53   VideoCaptureInput(ProcessThread* module_process_thread,
     54                     VideoCaptureCallback* frame_callback,
     55                     VideoRenderer* local_renderer,
     56                     SendStatisticsProxy* send_stats_proxy,
     57                     CpuOveruseObserver* overuse_observer,
     58                     EncodingTimeObserver* encoding_time_observer);
     59   ~VideoCaptureInput();
     60 
     61   void IncomingCapturedFrame(const VideoFrame& video_frame) override;
     62 
     63  private:
     64   // Thread functions for deliver captured frames to receivers.
     65   static bool EncoderThreadFunction(void* obj);
     66   bool EncoderProcess();
     67 
     68   rtc::scoped_ptr<CriticalSectionWrapper> capture_cs_;
     69   ProcessThread* const module_process_thread_;
     70 
     71   VideoCaptureCallback* const frame_callback_;
     72   VideoRenderer* const local_renderer_;
     73   SendStatisticsProxy* const stats_proxy_;
     74 
     75   // Frame used in IncomingFrameI420.
     76   rtc::scoped_ptr<CriticalSectionWrapper> incoming_frame_cs_;
     77   VideoFrame incoming_frame_;
     78 
     79   rtc::PlatformThread encoder_thread_;
     80   rtc::Event capture_event_;
     81 
     82   volatile int stop_;
     83 
     84   VideoFrame captured_frame_ GUARDED_BY(capture_cs_.get());
     85   // Used to make sure incoming time stamp is increasing for every frame.
     86   int64_t last_captured_timestamp_;
     87   // Delta used for translating between NTP and internal timestamps.
     88   const int64_t delta_ntp_internal_ms_;
     89 
     90   rtc::scoped_ptr<OveruseFrameDetector> overuse_detector_;
     91   EncodingTimeObserver* const encoding_time_observer_;
     92 };
     93 
     94 }  // namespace internal
     95 }  // namespace webrtc
     96 
     97 #endif  // WEBRTC_VIDEO_VIDEO_CAPTURE_INPUT_H_
     98