Deliver video frames on Android, on the decode thread.

webrtc/video/video_receive_stream.cc

 /*
  *  Copyright (c) 2013 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/video/video_receive_stream.h"
 
 #include <stdlib.h>
 
 #include <set>
 #include <string>
 #include <utility>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/location.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/optional.h"
+#include "webrtc/base/timeutils.h"
 #include "webrtc/base/trace_event.h"
 #include "webrtc/common_video/h264/profile_level_id.h"
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_receiver.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp.h"
 #include "webrtc/modules/utility/include/process_thread.h"
 #include "webrtc/modules/video_coding/frame_object.h"
 #include "webrtc/modules/video_coding/include/video_coding.h"
 #include "webrtc/modules/video_coding/jitter_estimator.h"
 #include "webrtc/modules/video_coding/timing.h"
@@ skipping 134 matching lines @@
   const int kDefaultStartBitrate = 300;
   codec.startBitrate = codec.minBitrate = codec.maxBitrate =
       kDefaultStartBitrate;
 
   return codec;
 }
 }  // namespace
 
 namespace internal {
 
-VideoReceiveStream::VideoReceiveStream(
-    int num_cpu_cores,
-    PacketRouter* packet_router,
-    VideoReceiveStream::Config config,
-    ProcessThread* process_thread,
-    CallStats* call_stats,
-    VieRemb* remb)
+VideoReceiveStream::VideoReceiveStream(int num_cpu_cores,
+                                       PacketRouter* packet_router,
+                                       VideoReceiveStream::Config config,
+                                       ProcessThread* process_thread,
+                                       CallStats* call_stats,
+                                       VieRemb* remb)
     : transport_adapter_(config.rtcp_send_transport),
       config_(std::move(config)),
       num_cpu_cores_(num_cpu_cores),
       process_thread_(process_thread),
       clock_(Clock::GetRealTimeClock()),
-      decode_thread_(DecodeThreadFunction, this, "DecodingThread"),
+      decode_thread_(&DecodeThreadFunction,
+                     this,
+                     "DecodingThread",
+                     rtc::kHighestPriority),
       call_stats_(call_stats),
       timing_(new VCMTiming(clock_)),
       video_receiver_(clock_, nullptr, this, timing_.get(), this, this),
       stats_proxy_(&config_, clock_),
       rtp_stream_receiver_(&transport_adapter_,
                            call_stats_->rtcp_rtt_stats(),
                            packet_router,
                            remb,
                            &config_,
                            &stats_proxy_,
@@ skipping 20 matching lines @@
         << ") for different decoders.";
     decoder_payload_types.insert(decoder.payload_type);
   }
 
   video_receiver_.SetRenderDelay(config.render_delay_ms);
 
   jitter_estimator_.reset(new VCMJitterEstimator(clock_));
   frame_buffer_.reset(new video_coding::FrameBuffer(
       clock_, jitter_estimator_.get(), timing_.get(), &stats_proxy_));
 
-  process_thread_->RegisterModule(&video_receiver_, RTC_FROM_HERE);
   process_thread_->RegisterModule(&rtp_stream_sync_, RTC_FROM_HERE);
 }
 
 VideoReceiveStream::~VideoReceiveStream() {
   RTC_DCHECK_RUN_ON(&worker_thread_checker_);
   LOG(LS_INFO) << "~VideoReceiveStream: " << config_.ToString();
   Stop();
 
   process_thread_->DeRegisterModule(&rtp_stream_sync_);
-  process_thread_->DeRegisterModule(&video_receiver_);
 }
 
 void VideoReceiveStream::SignalNetworkState(NetworkState state) {
   RTC_DCHECK_RUN_ON(&worker_thread_checker_);
   rtp_stream_receiver_.SignalNetworkState(state);
 }
 
-
 bool VideoReceiveStream::DeliverRtcp(const uint8_t* packet, size_t length) {
   return rtp_stream_receiver_.DeliverRtcp(packet, length);
 }
 
 void VideoReceiveStream::OnRtpPacket(const RtpPacketReceived& packet) {
   rtp_stream_receiver_.OnRtpPacket(packet);
 }
 
 bool VideoReceiveStream::OnRecoveredPacket(const uint8_t* packet,
                                            size_t length) {
@@ skipping 42 matching lines @@
     RTC_CHECK_EQ(VCM_OK, video_receiver_.RegisterReceiveCodec(
                              &codec, num_cpu_cores_, false));
   }
 
   video_stream_decoder_.reset(new VideoStreamDecoder(
       &video_receiver_, &rtp_stream_receiver_, &rtp_stream_receiver_,
       rtp_stream_receiver_.IsRetransmissionsEnabled(), protected_by_fec,
       &stats_proxy_, renderer));
   // Register the channel to receive stats updates.
   call_stats_->RegisterStatsObserver(video_stream_decoder_.get());
+
+  video_receiver_.DecoderThreadStarting();
+  process_thread_->RegisterModule(&video_receiver_, RTC_FROM_HERE);
+
   // Start the decode thread
   decode_thread_.Start();
-  decode_thread_.SetPriority(rtc::kHighestPriority);
   rtp_stream_receiver_.StartReceive();
 }
 
 void VideoReceiveStream::Stop() {
   RTC_DCHECK_RUN_ON(&worker_thread_checker_);
   rtp_stream_receiver_.StopReceive();
-  // TriggerDecoderShutdown will release any waiting decoder thread and make it
-  // stop immediately, instead of waiting for a timeout. Needs to be called
-  // before joining the decoder thread thread.
-  video_receiver_.TriggerDecoderShutdown();
 
   frame_buffer_->Stop();
   call_stats_->DeregisterStatsObserver(&rtp_stream_receiver_);
+  process_thread_->DeRegisterModule(&video_receiver_);
 
   if (decode_thread_.IsRunning()) {
+    // TriggerDecoderShutdown will release any waiting decoder thread and make
+    // it stop immediately, instead of waiting for a timeout. Needs to be called
+    // before joining the decoder thread thread.
+    video_receiver_.TriggerDecoderShutdown();
+
     decode_thread_.Stop();
+    video_receiver_.DecoderThreadStopped();
     // Deregister external decoders so they are no longer running during
     // destruction. This effectively stops the VCM since the decoder thread is
     // stopped, the VCM is deregistered and no asynchronous decoder threads are
     // running.
     for (const Decoder& decoder : config_.decoders)
       video_receiver_.RegisterExternalDecoder(nullptr, decoder.payload_type);
   }
 
   call_stats_->DeregisterStatsObserver(video_stream_decoder_.get());
   video_stream_decoder_.reset();
@@ skipping 123 matching lines @@
 uint32_t VideoReceiveStream::GetPlayoutTimestamp() const {
   RTC_NOTREACHED();
   return 0;
 }
 
 void VideoReceiveStream::SetMinimumPlayoutDelay(int delay_ms) {
   RTC_DCHECK_RUN_ON(&module_process_thread_checker_);
   video_receiver_.SetMinimumPlayoutDelay(delay_ms);
 }
 
-bool VideoReceiveStream::DecodeThreadFunction(void* ptr) {
-  return static_cast<VideoReceiveStream*>(ptr)->Decode();
+void VideoReceiveStream::DecodeThreadFunction(void* ptr) {
+  while (static_cast<VideoReceiveStream*>(ptr)->Decode()) {
+  }
 }
 
 bool VideoReceiveStream::Decode() {
   TRACE_EVENT0("webrtc", "VideoReceiveStream::Decode");
   static const int kMaxWaitForFrameMs = 3000;
   std::unique_ptr<video_coding::FrameObject> frame;
-  video_coding::FrameBuffer::ReturnReason res =
-      frame_buffer_->NextFrame(kMaxWaitForFrameMs, &frame);
 
-  if (res == video_coding::FrameBuffer::ReturnReason::kStopped) {
-    video_receiver_.DecodingStopped();
+  video_coding::FrameBuffer::ReturnReason res;
+#if defined(WEBRTC_ANDROID)
+  // This is a temporary workaround for video capture on Android in order to
+  // deliver asynchronously delivered frames, on the decoder thread.
+  // More details here:
+  // https://bugs.chromium.org/p/webrtc/issues/detail?id=7361
+  static const int kPollIntervalMs = 10;
+  int time_remaining = kMaxWaitForFrameMs;
+  do {
+    res = frame_buffer_->NextFrame(kPollIntervalMs, &frame);
+    if (res != video_coding::FrameBuffer::ReturnReason::kTimeout)
+      break;
+    time_remaining -= kPollIntervalMs;
+    video_receiver_.PollDecodedFrames();
+  } while (time_remaining > 0);
+#else
+  res = frame_buffer_->NextFrame(kMaxWaitForFrameMs, &frame);
+#endif
+
+  if (res == video_coding::FrameBuffer::ReturnReason::kStopped)
     return false;
-  }
 
   if (frame) {
     if (video_receiver_.Decode(frame.get()) == VCM_OK)
       rtp_stream_receiver_.FrameDecoded(frame->picture_id);
   } else {
+    RTC_DCHECK_EQ(res, video_coding::FrameBuffer::ReturnReason::kTimeout);
     LOG(LS_WARNING) << "No decodable frame in " << kMaxWaitForFrameMs
                     << " ms, requesting keyframe.";
     RequestKeyFrame();
   }
+
   return true;
 }
 }  // namespace internal
 }  // namespace webrtc