Reland of Split IncomingVideoStream into two implementations, with smoothing and without.

webrtc/common_video/incoming_video_stream.cc

 /*
  *  Copyright (c) 2012 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/common_video/include/incoming_video_stream.h"
 
-#include <assert.h>
-
+#include "webrtc/base/atomicops.h"
 #include "webrtc/base/platform_thread.h"
 #include "webrtc/base/timeutils.h"
 #include "webrtc/common_video/video_render_frames.h"
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/include/event_wrapper.h"
 
 namespace webrtc {
 
-IncomingVideoStream::IncomingVideoStream(bool disable_prerenderer_smoothing)
-    : disable_prerenderer_smoothing_(disable_prerenderer_smoothing),
-      incoming_render_thread_(),
+IncomingVideoStream::IncomingVideoStream(
+    int32_t delay_ms,
+    rtc::VideoSinkInterface<VideoFrame>* callback)
+    : incoming_render_thread_(&IncomingVideoStreamThreadFun,
+                              this,
+                              "IncomingVideoStreamThread"),
       deliver_buffer_event_(EventTimerWrapper::Create()),
-      running_(false),
-      external_callback_(nullptr),
-      render_buffers_(new VideoRenderFrames()) {}
+      external_callback_(callback),
+      render_buffers_(new VideoRenderFrames(delay_ms)) {
+  RTC_DCHECK(external_callback_);
+
+  render_thread_checker_.DetachFromThread();
+  decoder_thread_checker_.DetachFromThread();
+
+  incoming_render_thread_.Start();
+  incoming_render_thread_.SetPriority(rtc::kRealtimePriority);
+  deliver_buffer_event_->StartTimer(false, kEventStartupTimeMs);
+}
 
 IncomingVideoStream::~IncomingVideoStream() {
-  Stop();
+  RTC_DCHECK(main_thread_checker_.CalledOnValidThread());
+
+  {
+    rtc::CritScope cs(&buffer_critsect_);
+    render_buffers_.reset();
+  }
+
+  deliver_buffer_event_->Set();
+  incoming_render_thread_.Stop();
+  deliver_buffer_event_->StopTimer();
 }
 
 void IncomingVideoStream::OnFrame(const VideoFrame& video_frame) {
-  rtc::CritScope csS(&stream_critsect_);
-
-  if (!running_) {
-    return;
-  }
+  RTC_DCHECK_RUN_ON(&decoder_thread_checker_);
 
   // Hand over or insert frame.
-  if (disable_prerenderer_smoothing_) {
-    DeliverFrame(video_frame);
-  } else {
-    rtc::CritScope csB(&buffer_critsect_);
-    if (render_buffers_->AddFrame(video_frame) == 1) {
-      deliver_buffer_event_->Set();
-    }
+  rtc::CritScope csB(&buffer_critsect_);
+  if (render_buffers_->AddFrame(video_frame) == 1) {
+    deliver_buffer_event_->Set();
   }
 }
 
-int32_t IncomingVideoStream::SetExpectedRenderDelay(
-    int32_t delay_ms) {
-  rtc::CritScope csS(&stream_critsect_);
-  if (running_) {
-    return -1;
-  }
-  rtc::CritScope cs(&buffer_critsect_);
-  return render_buffers_->SetRenderDelay(delay_ms);
-}
-
-void IncomingVideoStream::SetExternalCallback(
-    rtc::VideoSinkInterface<VideoFrame>* external_callback) {
-  rtc::CritScope cs(&thread_critsect_);
-  external_callback_ = external_callback;
-}
-
-int32_t IncomingVideoStream::Start() {
-  rtc::CritScope csS(&stream_critsect_);
-  if (running_) {
-    return 0;
-  }
-
-  if (!disable_prerenderer_smoothing_) {
-    rtc::CritScope csT(&thread_critsect_);
-    assert(incoming_render_thread_ == NULL);
-
-    incoming_render_thread_.reset(new rtc::PlatformThread(
-        IncomingVideoStreamThreadFun, this, "IncomingVideoStreamThread"));
-    if (!incoming_render_thread_) {
-      return -1;
-    }
-
-    incoming_render_thread_->Start();
-    incoming_render_thread_->SetPriority(rtc::kRealtimePriority);
-    deliver_buffer_event_->StartTimer(false, kEventStartupTimeMs);
-  }
-
-  running_ = true;
-  return 0;
-}
-
-int32_t IncomingVideoStream::Stop() {
-  rtc::CritScope cs_stream(&stream_critsect_);
-
-  if (!running_) {
-    return 0;
-  }
-
-  rtc::PlatformThread* thread = NULL;
-  {
-    rtc::CritScope cs_thread(&thread_critsect_);
-    if (incoming_render_thread_) {
-      // Setting the incoming render thread to NULL marks that we're performing
-      // a shutdown and will make IncomingVideoStreamProcess abort after wakeup.
-      thread = incoming_render_thread_.release();
-      deliver_buffer_event_->StopTimer();
-      // Set the event to allow the thread to wake up and shut down without
-      // waiting for a timeout.
-      deliver_buffer_event_->Set();
-    }
-  }
-  if (thread) {
-    thread->Stop();
-    delete thread;
-  }
-  running_ = false;
-  return 0;
-}
-
 bool IncomingVideoStream::IncomingVideoStreamThreadFun(void* obj) {
   return static_cast<IncomingVideoStream*>(obj)->IncomingVideoStreamProcess();
 }
 
 bool IncomingVideoStream::IncomingVideoStreamProcess() {
+  RTC_DCHECK_RUN_ON(&render_thread_checker_);
+
   if (kEventError != deliver_buffer_event_->Wait(kEventMaxWaitTimeMs)) {
-    rtc::CritScope cs(&thread_critsect_);
-    if (incoming_render_thread_ == NULL) {
-      // Terminating
-      return false;
-    }
-
     // Get a new frame to render and the time for the frame after this one.
     rtc::Optional<VideoFrame> frame_to_render;
     uint32_t wait_time;
     {
       rtc::CritScope cs(&buffer_critsect_);
+      if (!render_buffers_.get()) {
+        // Terminating
+        return false;
+      }
       frame_to_render = render_buffers_->FrameToRender();
       wait_time = render_buffers_->TimeToNextFrameRelease();
     }
 
     // Set timer for next frame to render.
     if (wait_time > kEventMaxWaitTimeMs) {
       wait_time = kEventMaxWaitTimeMs;
     }
+
     deliver_buffer_event_->StartTimer(false, wait_time);
 
-    if (frame_to_render)
-      DeliverFrame(*frame_to_render);
+    if (frame_to_render) {
+      external_callback_->OnFrame(*frame_to_render);
+    }
   }
   return true;
 }
 
-void IncomingVideoStream::DeliverFrame(const VideoFrame& video_frame) {
-  rtc::CritScope cs(&thread_critsect_);
+////////////////////////////////////////////////////////////////////////////////
+IncomingVideoStreamNoSmoothing::IncomingVideoStreamNoSmoothing(
+    rtc::VideoSinkInterface<VideoFrame>* callback)
+    : callback_(callback), queue_("InVideoStream") {
+  decoder_thread_checker_.DetachFromThread();
+}
 
-  // Send frame for rendering.
-  if (external_callback_) {
-    external_callback_->OnFrame(video_frame);
-  }
+void IncomingVideoStreamNoSmoothing::OnFrame(const VideoFrame& video_frame) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_checker_);
+  queue_.PostTask([video_frame, this]() { callback_->OnFrame(video_frame); });
 }
 
 }  // namespace webrtc