Deliver video frames on Android, on the decode thread.

VideoCoding
* Adding a method for polling for frames on Android only until the capture implementation takes care of this (longer term plan).

CodecDatabase
* Add an accessor for the current decoder
* Use std::unique_ptr<> for ownership.
* Remove "Release()" and "ReleaseDecoder()". Instead just delete.
* Remove |friend| relationship between CodecDatabase and VCMGenericDecoder.

VCMDecodedFrameCallback
* DCHECKs for thread correctness.
* Remove |lock_| now that a threading model has been established and verified.

VCMGenericDecoder
* All methods now have thread checks.
* Variable access associated with thread checkers.

VideoReceiver
* Added two notification methods, DecoderThreadStarting() and DecoderThreadStopped()
  * Allows us to establish a period when the decoder thread is not running and it is safe to modify variables such as callbacks, that are only read when the decoder thread is running.
  * Allows us to DCHECK thread guarantees.
  * Allows synchronizing callbacks from the module process thread and have them only active while the decoder thread is running.
  * The above, allows us to establish two modes for the thread, single-threaded-mutable and multi-threaded-const.
  * Using that knowledge, we can remove |receive_crit_| as well as locking for a number of member variables.

MediaCodecVideoDecoder
* Removed frame polling code from this class, since this is now done from the root thread function in VideoReceiveStream.

VideoReceiveStream
* On Android: Polls for decoded frames every 10ms (same interval as previously in MediaCodecVideoDecoder)
* [Un]Registers the |video_receiver_| with the module thread only around the time the decoder thread is started/stopped.
* Notifies the receiver of start/stop events of the decoder thread.
* Changed the decoder thread to use the new PlatformThread callback type.

BUG=webrtc:7361, 695438

Review-Url: https://codereview.webrtc.org/2764573002
Cr-Commit-Position: refs/heads/master@{#17527}
diff --git a/webrtc/modules/video_coding/codec_database.cc b/webrtc/modules/video_coding/codec_database.cc
index 4d5e202..29899fc 100644
--- a/webrtc/modules/video_coding/codec_database.cc
+++ b/webrtc/modules/video_coding/codec_database.cc
@@ -71,6 +71,31 @@
   return h264_settings;
 }
 
+// Create an internal Decoder given a codec type
+static std::unique_ptr<VCMGenericDecoder> CreateDecoder(VideoCodecType type) {
+  switch (type) {
+    case kVideoCodecVP8:
+      return std::unique_ptr<VCMGenericDecoder>(
+          new VCMGenericDecoder(VP8Decoder::Create()));
+    case kVideoCodecVP9:
+      return std::unique_ptr<VCMGenericDecoder>(
+          new VCMGenericDecoder(VP9Decoder::Create()));
+    case kVideoCodecI420:
+      return std::unique_ptr<VCMGenericDecoder>(
+          new VCMGenericDecoder(new I420Decoder()));
+    case kVideoCodecH264:
+      if (H264Decoder::IsSupported()) {
+        return std::unique_ptr<VCMGenericDecoder>(
+            new VCMGenericDecoder(H264Decoder::Create()));
+      }
+      break;
+    default:
+      break;
+  }
+  LOG(LS_WARNING) << "No internal decoder of this type exists.";
+  return std::unique_ptr<VCMGenericDecoder>();
+}
+
 VCMDecoderMapItem::VCMDecoderMapItem(VideoCodec* settings,
                                      int number_of_cores,
                                      bool require_key_frame)
@@ -98,13 +123,12 @@
       external_encoder_(nullptr),
       internal_source_(false),
       encoded_frame_callback_(encoded_frame_callback),
-      ptr_decoder_(nullptr),
       dec_map_(),
       dec_external_map_() {}
 
 VCMCodecDataBase::~VCMCodecDataBase() {
   DeleteEncoder();
-  ReleaseDecoder(ptr_decoder_);
+  ptr_decoder_.reset();
   for (auto& kv : dec_map_)
     delete kv.second;
   for (auto& kv : dec_external_map_)
@@ -391,11 +415,10 @@
   // We can't use payload_type to check if the decoder is currently in use,
   // because payload type may be out of date (e.g. before we decode the first
   // frame after RegisterReceiveCodec)
-  if (ptr_decoder_ != nullptr &&
-      ptr_decoder_->_decoder == (*it).second->external_decoder_instance) {
+  if (ptr_decoder_ &&
+      ptr_decoder_->IsSameDecoder((*it).second->external_decoder_instance)) {
     // Release it if it was registered and in use.
-    ReleaseDecoder(ptr_decoder_);
-    ptr_decoder_ = nullptr;
+    ptr_decoder_.reset();
   }
   DeregisterReceiveCodec(payload_type);
   delete it->second;
@@ -455,12 +478,11 @@
   RTC_DCHECK(decoded_frame_callback->UserReceiveCallback());
   uint8_t payload_type = frame.PayloadType();
   if (payload_type == receive_codec_.plType || payload_type == 0) {
-    return ptr_decoder_;
+    return ptr_decoder_.get();
   }
   // Check for exisitng decoder, if exists - delete.
   if (ptr_decoder_) {
-    ReleaseDecoder(ptr_decoder_);
-    ptr_decoder_ = nullptr;
+    ptr_decoder_.reset();
     memset(&receive_codec_, 0, sizeof(VideoCodec));
   }
   ptr_decoder_ = CreateAndInitDecoder(frame, &receive_codec_);
@@ -471,36 +493,26 @@
   callback->OnIncomingPayloadType(receive_codec_.plType);
   if (ptr_decoder_->RegisterDecodeCompleteCallback(decoded_frame_callback) <
       0) {
-    ReleaseDecoder(ptr_decoder_);
-    ptr_decoder_ = nullptr;
+    ptr_decoder_.reset();
     memset(&receive_codec_, 0, sizeof(VideoCodec));
     return nullptr;
   }
-  return ptr_decoder_;
+  return ptr_decoder_.get();
 }
 
-void VCMCodecDataBase::ReleaseDecoder(VCMGenericDecoder* decoder) const {
-  if (decoder) {
-    RTC_DCHECK(decoder->_decoder);
-    decoder->Release();
-    if (!decoder->External()) {
-      delete decoder->_decoder;
-    }
-    delete decoder;
-  }
+VCMGenericDecoder* VCMCodecDataBase::GetCurrentDecoder() {
+  return ptr_decoder_.get();
 }
 
 bool VCMCodecDataBase::PrefersLateDecoding() const {
-  if (!ptr_decoder_)
-    return true;
-  return ptr_decoder_->PrefersLateDecoding();
+  return ptr_decoder_ ? ptr_decoder_->PrefersLateDecoding() : true;
 }
 
 bool VCMCodecDataBase::MatchesCurrentResolution(int width, int height) const {
   return send_codec_.width == width && send_codec_.height == height;
 }
 
-VCMGenericDecoder* VCMCodecDataBase::CreateAndInitDecoder(
+std::unique_ptr<VCMGenericDecoder> VCMCodecDataBase::CreateAndInitDecoder(
     const VCMEncodedFrame& frame,
     VideoCodec* new_codec) const {
   uint8_t payload_type = frame.PayloadType();
@@ -513,13 +525,13 @@
                   << static_cast<int>(payload_type);
     return nullptr;
   }
-  VCMGenericDecoder* ptr_decoder = nullptr;
+  std::unique_ptr<VCMGenericDecoder> ptr_decoder;
   const VCMExtDecoderMapItem* external_dec_item =
       FindExternalDecoderItem(payload_type);
   if (external_dec_item) {
     // External codec.
-    ptr_decoder = new VCMGenericDecoder(
-        external_dec_item->external_decoder_instance, true);
+    ptr_decoder.reset(new VCMGenericDecoder(
+        external_dec_item->external_decoder_instance, true));
   } else {
     // Create decoder.
     ptr_decoder = CreateDecoder(decoder_item->settings->codecType);
@@ -538,7 +550,6 @@
   }
   if (ptr_decoder->InitDecode(decoder_item->settings.get(),
                               decoder_item->number_of_cores) < 0) {
-    ReleaseDecoder(ptr_decoder);
     return nullptr;
   }
   memcpy(new_codec, decoder_item->settings.get(), sizeof(VideoCodec));
@@ -552,26 +563,6 @@
   ptr_encoder_.reset();
 }
 
-VCMGenericDecoder* VCMCodecDataBase::CreateDecoder(VideoCodecType type) const {
-  switch (type) {
-    case kVideoCodecVP8:
-      return new VCMGenericDecoder(VP8Decoder::Create());
-    case kVideoCodecVP9:
-      return new VCMGenericDecoder(VP9Decoder::Create());
-    case kVideoCodecI420:
-      return new VCMGenericDecoder(new I420Decoder());
-    case kVideoCodecH264:
-      if (H264Decoder::IsSupported()) {
-        return new VCMGenericDecoder(H264Decoder::Create());
-      }
-      break;
-    default:
-      break;
-  }
-  LOG(LS_WARNING) << "No internal decoder of this type exists.";
-  return nullptr;
-}
-
 const VCMDecoderMapItem* VCMCodecDataBase::FindDecoderItem(
     uint8_t payload_type) const {
   DecoderMap::const_iterator it = dec_map_.find(payload_type);
diff --git a/webrtc/modules/video_coding/codec_database.h b/webrtc/modules/video_coding/codec_database.h
index 1317e22..5f8656d 100644
--- a/webrtc/modules/video_coding/codec_database.h
+++ b/webrtc/modules/video_coding/codec_database.h
@@ -107,9 +107,9 @@
       const VCMEncodedFrame& frame,
       VCMDecodedFrameCallback* decoded_frame_callback);
 
-  // Deletes the memory of the decoder instance |decoder|. Used to delete
-  // deep copies returned by CreateDecoderCopy().
-  void ReleaseDecoder(VCMGenericDecoder* decoder) const;
+  // Returns the current decoder (i.e. the same value as was last returned from
+  // GetDecoder();
+  VCMGenericDecoder* GetCurrentDecoder();
 
   // Returns true if the currently active decoder prefer to decode frames late.
   // That means that frames must be decoded near the render times stamp.
@@ -121,8 +121,9 @@
   typedef std::map<uint8_t, VCMDecoderMapItem*> DecoderMap;
   typedef std::map<uint8_t, VCMExtDecoderMapItem*> ExternalDecoderMap;
 
-  VCMGenericDecoder* CreateAndInitDecoder(const VCMEncodedFrame& frame,
-                                          VideoCodec* new_codec) const;
+  std::unique_ptr<VCMGenericDecoder> CreateAndInitDecoder(
+      const VCMEncodedFrame& frame,
+      VideoCodec* new_codec) const;
 
   // Determines whether a new codec has to be created or not.
   // Checks every setting apart from maxFramerate and startBitrate.
@@ -130,9 +131,6 @@
 
   void DeleteEncoder();
 
-  // Create an internal Decoder given a codec type
-  VCMGenericDecoder* CreateDecoder(VideoCodecType type) const;
-
   const VCMDecoderMapItem* FindDecoderItem(uint8_t payload_type) const;
 
   const VCMExtDecoderMapItem* FindExternalDecoderItem(
@@ -149,7 +147,7 @@
   bool internal_source_;
   VCMEncodedFrameCallback* const encoded_frame_callback_;
   std::unique_ptr<VCMGenericEncoder> ptr_encoder_;
-  VCMGenericDecoder* ptr_decoder_;
+  std::unique_ptr<VCMGenericDecoder> ptr_decoder_;
   DecoderMap dec_map_;
   ExternalDecoderMap dec_external_map_;
 };  // VCMCodecDataBase
diff --git a/webrtc/modules/video_coding/generic_decoder.cc b/webrtc/modules/video_coding/generic_decoder.cc
index 2121ab6..6530a07 100644
--- a/webrtc/modules/video_coding/generic_decoder.cc
+++ b/webrtc/modules/video_coding/generic_decoder.cc
@@ -8,11 +8,12 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include "webrtc/modules/video_coding/generic_decoder.h"
+
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/trace_event.h"
 #include "webrtc/modules/video_coding/include/video_coding.h"
-#include "webrtc/modules/video_coding/generic_decoder.h"
 #include "webrtc/modules/video_coding/internal_defines.h"
 #include "webrtc/system_wrappers/include/clock.h"
 
@@ -23,9 +24,12 @@
     : _clock(clock),
       _timing(timing),
       _timestampMap(kDecoderFrameMemoryLength),
-      _lastReceivedPictureID(0) {}
+      _lastReceivedPictureID(0) {
+  decoder_thread_.DetachFromThread();
+}
 
 VCMDecodedFrameCallback::~VCMDecodedFrameCallback() {
+  RTC_DCHECK(construction_thread_.CalledOnValidThread());
 }
 
 void VCMDecodedFrameCallback::SetUserReceiveCallback(
@@ -37,6 +41,7 @@
 }
 
 VCMReceiveCallback* VCMDecodedFrameCallback::UserReceiveCallback() {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   // Called on the decode thread via VCMCodecDataBase::GetDecoder.
   // The callback must always have been set before this happens.
   RTC_DCHECK(_receiveCallback);
@@ -59,16 +64,14 @@
 void VCMDecodedFrameCallback::Decoded(VideoFrame& decodedImage,
                                       rtc::Optional<int32_t> decode_time_ms,
                                       rtc::Optional<uint8_t> qp) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   RTC_DCHECK(_receiveCallback) << "Callback must not be null at this point";
+
   TRACE_EVENT_INSTANT1("webrtc", "VCMDecodedFrameCallback::Decoded",
                        "timestamp", decodedImage.timestamp());
   // TODO(holmer): We should improve this so that we can handle multiple
   // callbacks from one call to Decode().
-  VCMFrameInformation* frameInfo;
-  {
-    rtc::CritScope cs(&lock_);
-    frameInfo = _timestampMap.Pop(decodedImage.timestamp());
-  }
+  VCMFrameInformation* frameInfo = _timestampMap.Pop(decodedImage.timestamp());
 
   if (frameInfo == NULL) {
     LOG(LS_WARNING) << "Too many frames backed up in the decoder, dropping "
@@ -92,101 +95,115 @@
 
 int32_t VCMDecodedFrameCallback::ReceivedDecodedReferenceFrame(
     const uint64_t pictureId) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   return _receiveCallback->ReceivedDecodedReferenceFrame(pictureId);
 }
 
 int32_t VCMDecodedFrameCallback::ReceivedDecodedFrame(
     const uint64_t pictureId) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   _lastReceivedPictureID = pictureId;
   return 0;
 }
 
 uint64_t VCMDecodedFrameCallback::LastReceivedPictureID() const {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   return _lastReceivedPictureID;
 }
 
 void VCMDecodedFrameCallback::OnDecoderImplementationName(
     const char* implementation_name) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   _receiveCallback->OnDecoderImplementationName(implementation_name);
 }
 
 void VCMDecodedFrameCallback::Map(uint32_t timestamp,
                                   VCMFrameInformation* frameInfo) {
-  rtc::CritScope cs(&lock_);
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   _timestampMap.Add(timestamp, frameInfo);
 }
 
 int32_t VCMDecodedFrameCallback::Pop(uint32_t timestamp) {
-  rtc::CritScope cs(&lock_);
-  if (_timestampMap.Pop(timestamp) == NULL) {
-    return VCM_GENERAL_ERROR;
-  }
-  return VCM_OK;
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
+  return _timestampMap.Pop(timestamp) == nullptr ? VCM_GENERAL_ERROR : VCM_OK;
 }
 
 VCMGenericDecoder::VCMGenericDecoder(VideoDecoder* decoder, bool isExternal)
     : _callback(NULL),
       _frameInfos(),
       _nextFrameInfoIdx(0),
-      _decoder(decoder),
+      decoder_(decoder),
       _codecType(kVideoCodecUnknown),
-      _isExternal(isExternal),
-      _keyFrameDecoded(false) {}
+      _isExternal(isExternal) {}
 
-VCMGenericDecoder::~VCMGenericDecoder() {}
+VCMGenericDecoder::~VCMGenericDecoder() {
+  decoder_->Release();
+  if (_isExternal)
+    decoder_.release();
+
+  RTC_DCHECK(_isExternal || !decoder_);
+}
 
 int32_t VCMGenericDecoder::InitDecode(const VideoCodec* settings,
                                       int32_t numberOfCores) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   TRACE_EVENT0("webrtc", "VCMGenericDecoder::InitDecode");
   _codecType = settings->codecType;
 
-  return _decoder->InitDecode(settings, numberOfCores);
+  return decoder_->InitDecode(settings, numberOfCores);
 }
 
 int32_t VCMGenericDecoder::Decode(const VCMEncodedFrame& frame, int64_t nowMs) {
-    TRACE_EVENT1("webrtc", "VCMGenericDecoder::Decode", "timestamp",
-                 frame.EncodedImage()._timeStamp);
-    _frameInfos[_nextFrameInfoIdx].decodeStartTimeMs = nowMs;
-    _frameInfos[_nextFrameInfoIdx].renderTimeMs = frame.RenderTimeMs();
-    _frameInfos[_nextFrameInfoIdx].rotation = frame.rotation();
-    _callback->Map(frame.TimeStamp(), &_frameInfos[_nextFrameInfoIdx]);
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
+  TRACE_EVENT2("webrtc", "VCMGenericDecoder::Decode", "timestamp",
+               frame.EncodedImage()._timeStamp, "decoder",
+               decoder_->ImplementationName());
+  _frameInfos[_nextFrameInfoIdx].decodeStartTimeMs = nowMs;
+  _frameInfos[_nextFrameInfoIdx].renderTimeMs = frame.RenderTimeMs();
+  _frameInfos[_nextFrameInfoIdx].rotation = frame.rotation();
+  _callback->Map(frame.TimeStamp(), &_frameInfos[_nextFrameInfoIdx]);
 
-    _nextFrameInfoIdx = (_nextFrameInfoIdx + 1) % kDecoderFrameMemoryLength;
-    const RTPFragmentationHeader dummy_header;
-    int32_t ret = _decoder->Decode(frame.EncodedImage(), frame.MissingFrame(),
-                                   &dummy_header,
-                                   frame.CodecSpecific(), frame.RenderTimeMs());
+  _nextFrameInfoIdx = (_nextFrameInfoIdx + 1) % kDecoderFrameMemoryLength;
+  const RTPFragmentationHeader dummy_header;
+  int32_t ret = decoder_->Decode(frame.EncodedImage(), frame.MissingFrame(),
+                                 &dummy_header, frame.CodecSpecific(),
+                                 frame.RenderTimeMs());
 
-    _callback->OnDecoderImplementationName(_decoder->ImplementationName());
+  // TODO(tommi): Necessary every time?
+  // Maybe this should be the first thing the function does, and only the first
+  // time around?
+  _callback->OnDecoderImplementationName(decoder_->ImplementationName());
+
+  if (ret != WEBRTC_VIDEO_CODEC_OK) {
     if (ret < WEBRTC_VIDEO_CODEC_OK) {
-        LOG(LS_WARNING) << "Failed to decode frame with timestamp "
-                        << frame.TimeStamp() << ", error code: " << ret;
-        _callback->Pop(frame.TimeStamp());
-        return ret;
-    } else if (ret == WEBRTC_VIDEO_CODEC_NO_OUTPUT ||
-               ret == WEBRTC_VIDEO_CODEC_REQUEST_SLI) {
-        // No output
-        _callback->Pop(frame.TimeStamp());
+      LOG(LS_WARNING) << "Failed to decode frame with timestamp "
+                      << frame.TimeStamp() << ", error code: " << ret;
     }
-    return ret;
-}
+    // We pop the frame for all non-'OK', failure or success codes such as
+    // WEBRTC_VIDEO_CODEC_NO_OUTPUT and WEBRTC_VIDEO_CODEC_REQUEST_SLI.
+    _callback->Pop(frame.TimeStamp());
+  }
 
-int32_t VCMGenericDecoder::Release() {
-  return _decoder->Release();
+  return ret;
 }
 
 int32_t VCMGenericDecoder::RegisterDecodeCompleteCallback(
     VCMDecodedFrameCallback* callback) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   _callback = callback;
-  return _decoder->RegisterDecodeCompleteCallback(callback);
-}
-
-bool VCMGenericDecoder::External() const {
-  return _isExternal;
+  return decoder_->RegisterDecodeCompleteCallback(callback);
 }
 
 bool VCMGenericDecoder::PrefersLateDecoding() const {
-  return _decoder->PrefersLateDecoding();
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
+  return decoder_->PrefersLateDecoding();
 }
 
+#if defined(WEBRTC_ANDROID)
+void VCMGenericDecoder::PollDecodedFrames() {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
+  decoder_->PollDecodedFrames();
+}
+#endif
+
 }  // namespace webrtc
diff --git a/webrtc/modules/video_coding/generic_decoder.h b/webrtc/modules/video_coding/generic_decoder.h
index 891ec89..1df2060 100644
--- a/webrtc/modules/video_coding/generic_decoder.h
+++ b/webrtc/modules/video_coding/generic_decoder.h
@@ -11,7 +11,8 @@
 #ifndef WEBRTC_MODULES_VIDEO_CODING_GENERIC_DECODER_H_
 #define WEBRTC_MODULES_VIDEO_CODING_GENERIC_DECODER_H_
 
-#include "webrtc/base/criticalsection.h"
+#include <memory>
+
 #include "webrtc/base/thread_checker.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/modules/video_coding/encoded_frame.h"
@@ -36,6 +37,7 @@
  public:
   VCMDecodedFrameCallback(VCMTiming* timing, Clock* clock);
   ~VCMDecodedFrameCallback() override;
+
   void SetUserReceiveCallback(VCMReceiveCallback* receiveCallback);
   VCMReceiveCallback* UserReceiveCallback();
 
@@ -55,7 +57,7 @@
 
  private:
   rtc::ThreadChecker construction_thread_;
-  // Protect |_timestampMap|.
+  rtc::ThreadChecker decoder_thread_;
   Clock* const _clock;
   // This callback must be set before the decoder thread starts running
   // and must only be unset when external threads (e.g decoder thread)
@@ -63,15 +65,12 @@
   // while there are more than one threads involved, it must be set
   // from the same thread, and therfore a lock is not required to access it.
   VCMReceiveCallback* _receiveCallback = nullptr;
-  VCMTiming* _timing;
-  rtc::CriticalSection lock_;
-  VCMTimestampMap _timestampMap GUARDED_BY(lock_);
-  uint64_t _lastReceivedPictureID;
+  VCMTiming* _timing ACCESS_ON(decoder_thread_);
+  VCMTimestampMap _timestampMap ACCESS_ON(decoder_thread_);
+  uint64_t _lastReceivedPictureID ACCESS_ON(decoder_thread_);
 };
 
 class VCMGenericDecoder {
-  friend class VCMCodecDataBase;
-
  public:
   explicit VCMGenericDecoder(VideoDecoder* decoder, bool isExternal = false);
   ~VCMGenericDecoder();
@@ -89,26 +88,30 @@
   int32_t Decode(const VCMEncodedFrame& inputFrame, int64_t nowMs);
 
   /**
-  * Free the decoder memory
-  */
-  int32_t Release();
-
-  /**
   * Set decode callback. Deregistering while decoding is illegal.
   */
   int32_t RegisterDecodeCompleteCallback(VCMDecodedFrameCallback* callback);
 
-  bool External() const;
   bool PrefersLateDecoding() const;
 
+#if defined(WEBRTC_ANDROID)
+  // See https://bugs.chromium.org/p/webrtc/issues/detail?id=7361
+  void PollDecodedFrames();
+#endif
+
+  bool IsSameDecoder(VideoDecoder* decoder) const {
+    return decoder_.get() == decoder;
+  }
+
  private:
-  VCMDecodedFrameCallback* _callback;
-  VCMFrameInformation _frameInfos[kDecoderFrameMemoryLength];
-  uint32_t _nextFrameInfoIdx;
-  VideoDecoder* const _decoder;
-  VideoCodecType _codecType;
-  bool _isExternal;
-  bool _keyFrameDecoded;
+  rtc::ThreadChecker decoder_thread_;
+  VCMDecodedFrameCallback* _callback ACCESS_ON(decoder_thread_);
+  VCMFrameInformation _frameInfos[kDecoderFrameMemoryLength] ACCESS_ON(
+      decoder_thread_);
+  uint32_t _nextFrameInfoIdx ACCESS_ON(decoder_thread_);
+  std::unique_ptr<VideoDecoder> decoder_;
+  VideoCodecType _codecType ACCESS_ON(decoder_thread_);
+  const bool _isExternal;
 };
 
 }  // namespace webrtc
diff --git a/webrtc/modules/video_coding/video_coding_impl.h b/webrtc/modules/video_coding/video_coding_impl.h
index 5e547df..d6e722d 100644
--- a/webrtc/modules/video_coding/video_coding_impl.h
+++ b/webrtc/modules/video_coding/video_coding_impl.h
@@ -35,6 +35,7 @@
 
 namespace webrtc {
 
+class ProcessThread;
 class VideoBitrateAllocator;
 class VideoBitrateAllocationObserver;
 
@@ -150,7 +151,7 @@
                 VCMTiming* timing,
                 NackSender* nack_sender = nullptr,
                 KeyFrameRequestSender* keyframe_request_sender = nullptr);
-  ~VideoReceiver();
+  ~VideoReceiver() override;
 
   int32_t RegisterReceiveCodec(const VideoCodec* receiveCodec,
                                int32_t numberOfCores,
@@ -168,8 +169,10 @@
 
   int32_t Decode(const webrtc::VCMEncodedFrame* frame);
 
-  // Called on the decoder thread when thread is exiting.
-  void DecodingStopped();
+#if defined(WEBRTC_ANDROID)
+  // See https://bugs.chromium.org/p/webrtc/issues/detail?id=7361
+  void PollDecodedFrames();
+#endif
 
   int32_t IncomingPacket(const uint8_t* incomingPayload,
                          size_t payloadLength,
@@ -195,39 +198,66 @@
 
   int64_t TimeUntilNextProcess() override;
   void Process() override;
+  void ProcessThreadAttached(ProcessThread* process_thread) override;
 
   void TriggerDecoderShutdown();
+  void DecoderThreadStarting();
+  void DecoderThreadStopped();
 
  protected:
-  int32_t Decode(const webrtc::VCMEncodedFrame& frame)
-      EXCLUSIVE_LOCKS_REQUIRED(receive_crit_);
+  int32_t Decode(const webrtc::VCMEncodedFrame& frame);
   int32_t RequestKeyFrame();
 
  private:
+  // Used for DCHECKing thread correctness.
+  // In build where DCHECKs are enabled, will return false before
+  // DecoderThreadStarting is called, then true until DecoderThreadStopped
+  // is called.
+  // In builds where DCHECKs aren't enabled, it will return true.
+  bool IsDecoderThreadRunning();
+
   rtc::ThreadChecker construction_thread_;
+  rtc::ThreadChecker decoder_thread_;
+  rtc::ThreadChecker module_thread_;
   Clock* const clock_;
   rtc::CriticalSection process_crit_;
-  rtc::CriticalSection receive_crit_;
   VCMTiming* _timing;
   VCMReceiver _receiver;
   VCMDecodedFrameCallback _decodedFrameCallback;
-  VCMFrameTypeCallback* _frameTypeCallback GUARDED_BY(process_crit_);
-  VCMReceiveStatisticsCallback* _receiveStatsCallback GUARDED_BY(process_crit_);
-  VCMPacketRequestCallback* _packetRequestCallback GUARDED_BY(process_crit_);
 
-  VCMFrameBuffer _frameFromFile;
+  // These callbacks are set on the construction thread before being attached
+  // to the module thread or decoding started, so a lock is not required.
+  VCMFrameTypeCallback* _frameTypeCallback;
+  VCMReceiveStatisticsCallback* _receiveStatsCallback;
+  VCMPacketRequestCallback* _packetRequestCallback;
+
+  // Used on both the module and decoder thread.
   bool _scheduleKeyRequest GUARDED_BY(process_crit_);
   bool drop_frames_until_keyframe_ GUARDED_BY(process_crit_);
-  size_t max_nack_list_size_ GUARDED_BY(process_crit_);
 
-  VCMCodecDataBase _codecDataBase GUARDED_BY(receive_crit_);
-  EncodedImageCallback* pre_decode_image_callback_;
+  // Modified on the construction thread while not attached to the process
+  // thread.  Once attached to the process thread, its value is only read
+  // so a lock is not required.
+  size_t max_nack_list_size_;
 
-  VCMProcessTimer _receiveStatsTimer;
-  VCMProcessTimer _retransmissionTimer;
-  VCMProcessTimer _keyRequestTimer;
-  QpParser qp_parser_;
-  ThreadUnsafeOneTimeEvent first_frame_received_;
+  // Callbacks are set before the decoder thread starts.
+  // Once the decoder thread has been started, usage of |_codecDataBase| moves
+  // over to the decoder thread.
+  VCMCodecDataBase _codecDataBase;
+  EncodedImageCallback* const pre_decode_image_callback_;
+
+  VCMProcessTimer _receiveStatsTimer ACCESS_ON(module_thread_);
+  VCMProcessTimer _retransmissionTimer ACCESS_ON(module_thread_);
+  VCMProcessTimer _keyRequestTimer ACCESS_ON(module_thread_);
+  QpParser qp_parser_ ACCESS_ON(decoder_thread_);
+  ThreadUnsafeOneTimeEvent first_frame_received_ ACCESS_ON(decoder_thread_);
+  // Modified on the construction thread. Can be read without a lock and assumed
+  // to be non-null on the module and decoder threads.
+  ProcessThread* process_thread_ = nullptr;
+  bool is_attached_to_process_thread_ ACCESS_ON(construction_thread_) = false;
+#if RTC_DCHECK_IS_ON
+  bool decoder_thread_is_running_ = false;
+#endif
 };
 
 }  // namespace vcm
diff --git a/webrtc/modules/video_coding/video_receiver.cc b/webrtc/modules/video_coding/video_receiver.cc
index 84f5af5..f1503ba 100644
--- a/webrtc/modules/video_coding/video_receiver.cc
+++ b/webrtc/modules/video_coding/video_receiver.cc
@@ -9,12 +9,14 @@
  */
 
 #include "webrtc/base/checks.h"
+#include "webrtc/base/location.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/trace_event.h"
 #include "webrtc/common_types.h"
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
-#include "webrtc/modules/video_coding/include/video_codec_interface.h"
+#include "webrtc/modules/utility/include/process_thread.h"
 #include "webrtc/modules/video_coding/encoded_frame.h"
+#include "webrtc/modules/video_coding/include/video_codec_interface.h"
 #include "webrtc/modules/video_coding/jitter_buffer.h"
 #include "webrtc/modules/video_coding/packet.h"
 #include "webrtc/modules/video_coding/video_coding_impl.h"
@@ -40,7 +42,6 @@
       _frameTypeCallback(nullptr),
       _receiveStatsCallback(nullptr),
       _packetRequestCallback(nullptr),
-      _frameFromFile(),
       _scheduleKeyRequest(false),
       drop_frames_until_keyframe_(false),
       max_nack_list_size_(0),
@@ -48,18 +49,23 @@
       pre_decode_image_callback_(pre_decode_image_callback),
       _receiveStatsTimer(1000, clock_),
       _retransmissionTimer(10, clock_),
-      _keyRequestTimer(500, clock_) {}
+      _keyRequestTimer(500, clock_) {
+  decoder_thread_.DetachFromThread();
+  module_thread_.DetachFromThread();
+}
 
-VideoReceiver::~VideoReceiver() {}
+VideoReceiver::~VideoReceiver() {
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+}
 
 void VideoReceiver::Process() {
+  RTC_DCHECK_RUN_ON(&module_thread_);
   // Receive-side statistics
 
   // TODO(philipel): Remove this if block when we know what to do with
   //                 ReceiveStatisticsProxy::QualitySample.
   if (_receiveStatsTimer.TimeUntilProcess() == 0) {
     _receiveStatsTimer.Processed();
-    rtc::CritScope cs(&process_crit_);
     if (_receiveStatsCallback != nullptr) {
       _receiveStatsCallback->OnReceiveRatesUpdated(0, 0);
     }
@@ -68,10 +74,10 @@
   // Key frame requests
   if (_keyRequestTimer.TimeUntilProcess() == 0) {
     _keyRequestTimer.Processed();
-    bool request_key_frame = false;
-    {
+    bool request_key_frame = _frameTypeCallback != nullptr;
+    if (request_key_frame) {
       rtc::CritScope cs(&process_crit_);
-      request_key_frame = _scheduleKeyRequest && _frameTypeCallback != nullptr;
+      request_key_frame = _scheduleKeyRequest;
     }
     if (request_key_frame)
       RequestKeyFrame();
@@ -82,13 +88,8 @@
   // disabled when NACK is off.
   if (_retransmissionTimer.TimeUntilProcess() == 0) {
     _retransmissionTimer.Processed();
-    bool callback_registered = false;
-    uint16_t length;
-    {
-      rtc::CritScope cs(&process_crit_);
-      length = max_nack_list_size_;
-      callback_registered = _packetRequestCallback != nullptr;
-    }
+    bool callback_registered = _packetRequestCallback != nullptr;
+    uint16_t length = max_nack_list_size_;
     if (callback_registered && length > 0) {
       // Collect sequence numbers from the default receiver.
       bool request_key_frame = false;
@@ -98,7 +99,6 @@
         ret = RequestKeyFrame();
       }
       if (ret == VCM_OK && !nackList.empty()) {
-        rtc::CritScope cs(&process_crit_);
         if (_packetRequestCallback != nullptr) {
           _packetRequestCallback->ResendPackets(&nackList[0], nackList.size());
         }
@@ -107,7 +107,18 @@
   }
 }
 
+void VideoReceiver::ProcessThreadAttached(ProcessThread* process_thread) {
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  if (process_thread) {
+    is_attached_to_process_thread_ = true;
+    process_thread_ = process_thread;
+  } else {
+    is_attached_to_process_thread_ = false;
+  }
+}
+
 int64_t VideoReceiver::TimeUntilNextProcess() {
+  RTC_DCHECK_RUN_ON(&module_thread_);
   int64_t timeUntilNextProcess = _receiveStatsTimer.TimeUntilProcess();
   if (_receiver.NackMode() != kNoNack) {
     // We need a Process call more often if we are relying on
@@ -122,7 +133,7 @@
 }
 
 int32_t VideoReceiver::SetReceiveChannelParameters(int64_t rtt) {
-  rtc::CritScope cs(&receive_crit_);
+  RTC_DCHECK_RUN_ON(&module_thread_);
   _receiver.UpdateRtt(rtt);
   return 0;
 }
@@ -142,7 +153,6 @@
     }
 
     case kProtectionNackFEC: {
-      rtc::CritScope cs(&receive_crit_);
       RTC_DCHECK(enable);
       _receiver.SetNackMode(kNack,
                             media_optimization::kLowRttNackMs,
@@ -165,20 +175,22 @@
 // ready for rendering.
 int32_t VideoReceiver::RegisterReceiveCallback(
     VCMReceiveCallback* receiveCallback) {
-  RTC_DCHECK(construction_thread_.CalledOnValidThread());
-  // TODO(tommi): Callback may be null, but only after the decoder thread has
-  // been stopped. Use the signal we now get that tells us when the decoder
-  // thread isn't running, to DCHECK that the method is never called while it
-  // is. Once we're confident, we can remove the lock.
-  rtc::CritScope cs(&receive_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
+  // This value is set before the decoder thread starts and unset after
+  // the decoder thread has been stopped.
   _decodedFrameCallback.SetUserReceiveCallback(receiveCallback);
   return VCM_OK;
 }
 
 int32_t VideoReceiver::RegisterReceiveStatisticsCallback(
     VCMReceiveStatisticsCallback* receiveStats) {
-  RTC_DCHECK(construction_thread_.CalledOnValidThread());
-  rtc::CritScope cs(&process_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning() && !is_attached_to_process_thread_);
+  // |_receiver| is used on both the decoder and module threads.
+  // However, since we make sure that we never do anything on the module thread
+  // when the decoder thread is not running, we don't need a lock for the
+  // |_receiver| or |_receiveStatsCallback| here.
   _receiver.RegisterStatsCallback(receiveStats);
   _receiveStatsCallback = receiveStats;
   return VCM_OK;
@@ -187,10 +199,8 @@
 // Register an externally defined decoder object.
 void VideoReceiver::RegisterExternalDecoder(VideoDecoder* externalDecoder,
                                             uint8_t payloadType) {
-  RTC_DCHECK(construction_thread_.CalledOnValidThread());
-  // TODO(tommi): This method must be called when the decoder thread is not
-  // running.  Do we need a lock in that case?
-  rtc::CritScope cs(&receive_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
   if (externalDecoder == nullptr) {
     RTC_CHECK(_codecDataBase.DeregisterExternalDecoder(payloadType));
     return;
@@ -201,53 +211,87 @@
 // Register a frame type request callback.
 int32_t VideoReceiver::RegisterFrameTypeCallback(
     VCMFrameTypeCallback* frameTypeCallback) {
-  rtc::CritScope cs(&process_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning() && !is_attached_to_process_thread_);
+  // This callback is used on the module thread, but since we don't get
+  // callbacks on the module thread while the decoder thread isn't running
+  // (and this function must not be called when the decoder is running),
+  // we don't need a lock here.
   _frameTypeCallback = frameTypeCallback;
   return VCM_OK;
 }
 
 int32_t VideoReceiver::RegisterPacketRequestCallback(
     VCMPacketRequestCallback* callback) {
-  rtc::CritScope cs(&process_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning() && !is_attached_to_process_thread_);
+  // This callback is used on the module thread, but since we don't get
+  // callbacks on the module thread while the decoder thread isn't running
+  // (and this function must not be called when the decoder is running),
+  // we don't need a lock here.
   _packetRequestCallback = callback;
   return VCM_OK;
 }
 
 void VideoReceiver::TriggerDecoderShutdown() {
-  RTC_DCHECK(construction_thread_.CalledOnValidThread());
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(IsDecoderThreadRunning());
   _receiver.TriggerDecoderShutdown();
 }
 
+void VideoReceiver::DecoderThreadStarting() {
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
+  if (process_thread_ && !is_attached_to_process_thread_) {
+    process_thread_->RegisterModule(this, RTC_FROM_HERE);
+  }
+#if RTC_DCHECK_IS_ON
+  decoder_thread_is_running_ = true;
+#endif
+}
+
+void VideoReceiver::DecoderThreadStopped() {
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(IsDecoderThreadRunning());
+  if (process_thread_ && is_attached_to_process_thread_) {
+    process_thread_->DeRegisterModule(this);
+  }
+#if RTC_DCHECK_IS_ON
+  decoder_thread_is_running_ = false;
+  decoder_thread_.DetachFromThread();
+#endif
+}
+
 // Decode next frame, blocking.
 // Should be called as often as possible to get the most out of the decoder.
 int32_t VideoReceiver::Decode(uint16_t maxWaitTimeMs) {
-  bool prefer_late_decoding = false;
-  {
-    // TODO(tommi): Chances are that this lock isn't required.
-    rtc::CritScope cs(&receive_crit_);
-    prefer_late_decoding = _codecDataBase.PrefersLateDecoding();
-  }
-
-  VCMEncodedFrame* frame =
-      _receiver.FrameForDecoding(maxWaitTimeMs, prefer_late_decoding);
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
+  VCMEncodedFrame* frame = _receiver.FrameForDecoding(
+      maxWaitTimeMs, _codecDataBase.PrefersLateDecoding());
 
   if (!frame)
     return VCM_FRAME_NOT_READY;
 
+  bool drop_frame = false;
   {
     rtc::CritScope cs(&process_crit_);
     if (drop_frames_until_keyframe_) {
       // Still getting delta frames, schedule another keyframe request as if
       // decode failed.
       if (frame->FrameType() != kVideoFrameKey) {
+        drop_frame = true;
         _scheduleKeyRequest = true;
-        _receiver.ReleaseFrame(frame);
-        return VCM_FRAME_NOT_READY;
+      } else {
+        drop_frames_until_keyframe_ = false;
       }
-      drop_frames_until_keyframe_ = false;
     }
   }
 
+  if (drop_frame) {
+    _receiver.ReleaseFrame(frame);
+    return VCM_FRAME_NOT_READY;
+  }
+
   if (pre_decode_image_callback_) {
     EncodedImage encoded_image(frame->EncodedImage());
     int qp = -1;
@@ -258,7 +302,6 @@
                                                frame->CodecSpecific(), nullptr);
   }
 
-  rtc::CritScope cs(&receive_crit_);
   // If this frame was too late, we should adjust the delay accordingly
   _timing->UpdateCurrentDelay(frame->RenderTimeMs(),
                               clock_->TimeInMilliseconds());
@@ -278,7 +321,7 @@
 // TODO(philipel): Clean up among the Decode functions as we replace
 //                 VCMEncodedFrame with FrameObject.
 int32_t VideoReceiver::Decode(const webrtc::VCMEncodedFrame* frame) {
-  rtc::CritScope lock(&receive_crit_);
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   if (pre_decode_image_callback_) {
     EncodedImage encoded_image(frame->EncodedImage());
     int qp = -1;
@@ -291,19 +334,20 @@
   return Decode(*frame);
 }
 
-void VideoReceiver::DecodingStopped() {
-  // No further calls to Decode() will be made after this point.
-  // TODO(tommi): Make use of this to clarify and check threading model.
-}
-
 int32_t VideoReceiver::RequestKeyFrame() {
+  RTC_DCHECK_RUN_ON(&module_thread_);
+
+  // Since we deregister from the module thread when the decoder thread isn't
+  // running, we should get no calls here if decoding isn't being done.
+  RTC_DCHECK(IsDecoderThreadRunning());
+
   TRACE_EVENT0("webrtc", "RequestKeyFrame");
-  rtc::CritScope cs(&process_crit_);
   if (_frameTypeCallback != nullptr) {
     const int32_t ret = _frameTypeCallback->RequestKeyFrame();
     if (ret < 0) {
       return ret;
     }
+    rtc::CritScope cs(&process_crit_);
     _scheduleKeyRequest = false;
   } else {
     return VCM_MISSING_CALLBACK;
@@ -313,6 +357,7 @@
 
 // Must be called from inside the receive side critical section.
 int32_t VideoReceiver::Decode(const VCMEncodedFrame& frame) {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
   TRACE_EVENT0("webrtc", "VideoReceiver::Decode");
   // Change decoder if payload type has changed
   VCMGenericDecoder* decoder =
@@ -324,31 +369,41 @@
   int32_t ret = decoder->Decode(frame, clock_->TimeInMilliseconds());
 
   // Check for failed decoding, run frame type request callback if needed.
-  bool request_key_frame = false;
-  if (ret < 0) {
-    request_key_frame = true;
-  }
+  bool request_key_frame = (ret < 0);
 
   if (!frame.Complete() || frame.MissingFrame()) {
     request_key_frame = true;
     ret = VCM_OK;
   }
+
   if (request_key_frame) {
     rtc::CritScope cs(&process_crit_);
-    _scheduleKeyRequest = true;
+    if (!_scheduleKeyRequest) {
+      _scheduleKeyRequest = true;
+      // TODO(tommi): Consider if we could instead post a task to the module
+      // thread and call RequestKeyFrame directly. Here we call WakeUp so that
+      // TimeUntilNextProcess() gets called straight away.
+      process_thread_->WakeUp(this);
+    }
   }
   return ret;
 }
 
+#if defined(WEBRTC_ANDROID)
+void VideoReceiver::PollDecodedFrames() {
+  RTC_DCHECK_RUN_ON(&decoder_thread_);
+  auto* current_decoder = _codecDataBase.GetCurrentDecoder();
+  if (current_decoder)
+    current_decoder->PollDecodedFrames();
+}
+#endif
+
 // Register possible receive codecs, can be called multiple times
 int32_t VideoReceiver::RegisterReceiveCodec(const VideoCodec* receiveCodec,
                                             int32_t numberOfCores,
                                             bool requireKeyFrame) {
-  RTC_DCHECK(construction_thread_.CalledOnValidThread());
-  // TODO(tommi): This method must only be called when the decoder thread
-  // is not running. Do we need a lock? If not, it looks like we might not need
-  // a lock at all for |_codecDataBase|.
-  rtc::CritScope cs(&receive_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
   if (receiveCodec == nullptr) {
     return VCM_PARAMETER_ERROR;
   }
@@ -363,6 +418,7 @@
 int32_t VideoReceiver::IncomingPacket(const uint8_t* incomingPayload,
                                       size_t payloadLength,
                                       const WebRtcRTPHeader& rtpInfo) {
+  RTC_DCHECK_RUN_ON(&module_thread_);
   if (rtpInfo.frameType == kVideoFrameKey) {
     TRACE_EVENT1("webrtc", "VCM::PacketKeyFrame", "seqnum",
                  rtpInfo.header.sequenceNumber);
@@ -394,6 +450,7 @@
 // to sync with audio. Not included in  VideoCodingModule::Delay()
 // Defaults to 0 ms.
 int32_t VideoReceiver::SetMinimumPlayoutDelay(uint32_t minPlayoutDelayMs) {
+  RTC_DCHECK_RUN_ON(&module_thread_);
   _timing->set_min_playout_delay(minPlayoutDelayMs);
   return VCM_OK;
 }
@@ -401,22 +458,24 @@
 // The estimated delay caused by rendering, defaults to
 // kDefaultRenderDelayMs = 10 ms
 int32_t VideoReceiver::SetRenderDelay(uint32_t timeMS) {
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
   _timing->set_render_delay(timeMS);
   return VCM_OK;
 }
 
 // Current video delay
 int32_t VideoReceiver::Delay() const {
+  RTC_DCHECK_RUN_ON(&module_thread_);
   return _timing->TargetVideoDelay();
 }
 
+// Only used by VCMRobustnessTest.
 int VideoReceiver::SetReceiverRobustnessMode(
     VideoCodingModule::ReceiverRobustness robustnessMode,
     VCMDecodeErrorMode decode_error_mode) {
-  RTC_DCHECK(construction_thread_.CalledOnValidThread());
-  // TODO(tommi): This method must only be called when the decoder thread
-  // is not running and we don't need to hold this lock.
-  rtc::CritScope cs(&receive_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
   switch (robustnessMode) {
     case VideoCodingModule::kNone:
       _receiver.SetNackMode(kNoNack, -1, -1);
@@ -434,24 +493,40 @@
 }
 
 void VideoReceiver::SetDecodeErrorMode(VCMDecodeErrorMode decode_error_mode) {
-  rtc::CritScope cs(&receive_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
   _receiver.SetDecodeErrorMode(decode_error_mode);
 }
 
 void VideoReceiver::SetNackSettings(size_t max_nack_list_size,
                                     int max_packet_age_to_nack,
                                     int max_incomplete_time_ms) {
-  if (max_nack_list_size != 0) {
-    rtc::CritScope cs(&process_crit_);
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
+
+  if (max_nack_list_size != 0)
     max_nack_list_size_ = max_nack_list_size;
-  }
   _receiver.SetNackSettings(max_nack_list_size, max_packet_age_to_nack,
                             max_incomplete_time_ms);
 }
 
 int VideoReceiver::SetMinReceiverDelay(int desired_delay_ms) {
+  RTC_DCHECK_RUN_ON(&construction_thread_);
+  RTC_DCHECK(!IsDecoderThreadRunning());
+  // TODO(tommi): Is the method only used by tests? Maybe could be offered
+  // via a test only subclass?
+  // Info from Stefan: If it is indeed only used by tests I think it's just that
+  // it hasn't been cleaned up when the calling code was cleaned up.
   return _receiver.SetMinReceiverDelay(desired_delay_ms);
 }
 
+bool VideoReceiver::IsDecoderThreadRunning() {
+#if RTC_DCHECK_IS_ON
+  return decoder_thread_is_running_;
+#else
+  return true;
+#endif
+}
+
 }  // namespace vcm
 }  // namespace webrtc