Repo created

TMessagesProj/jni/voip/webrtc/modules/video_coding/deprecated/receiver.cc

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+/*
+ *  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 "modules/video_coding/deprecated/receiver.h"
+
+#include <cstdint>
+#include <cstdlib>
+#include <utility>
+#include <vector>
+
+#include "absl/memory/memory.h"
+#include "api/video/encoded_image.h"
+#include "modules/video_coding/deprecated/jitter_buffer_common.h"
+#include "modules/video_coding/encoded_frame.h"
+#include "modules/video_coding/internal_defines.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/numerics/safe_conversions.h"
+#include "rtc_base/trace_event.h"
+#include "system_wrappers/include/clock.h"
+
+namespace webrtc {
+
+enum { kMaxReceiverDelayMs = 10000 };
+
+VCMReceiver::VCMReceiver(VCMTiming* timing,
+                         Clock* clock,
+                         const FieldTrialsView& field_trials)
+    : VCMReceiver::VCMReceiver(timing,
+                               clock,
+                               absl::WrapUnique(EventWrapper::Create()),
+                               absl::WrapUnique(EventWrapper::Create()),
+                               field_trials) {}
+
+VCMReceiver::VCMReceiver(VCMTiming* timing,
+                         Clock* clock,
+                         std::unique_ptr<EventWrapper> receiver_event,
+                         std::unique_ptr<EventWrapper> jitter_buffer_event,
+                         const FieldTrialsView& field_trials)
+    : clock_(clock),
+      jitter_buffer_(clock_, std::move(jitter_buffer_event), field_trials),
+      timing_(timing),
+      render_wait_event_(std::move(receiver_event)),
+      max_video_delay_ms_(kMaxVideoDelayMs) {
+  jitter_buffer_.Start();
+}
+
+VCMReceiver::~VCMReceiver() {
+  render_wait_event_->Set();
+}
+
+int32_t VCMReceiver::InsertPacket(const VCMPacket& packet) {
+  // Insert the packet into the jitter buffer. The packet can either be empty or
+  // contain media at this point.
+  bool retransmitted = false;
+  const VCMFrameBufferEnum ret =
+      jitter_buffer_.InsertPacket(packet, &retransmitted);
+  if (ret == kOldPacket) {
+    return VCM_OK;
+  } else if (ret == kFlushIndicator) {
+    return VCM_FLUSH_INDICATOR;
+  } else if (ret < 0) {
+    return VCM_JITTER_BUFFER_ERROR;
+  }
+  if (ret == kCompleteSession && !retransmitted) {
+    // We don't want to include timestamps which have suffered from
+    // retransmission here, since we compensate with extra retransmission
+    // delay within the jitter estimate.
+    timing_->IncomingTimestamp(packet.timestamp, clock_->CurrentTime());
+  }
+  return VCM_OK;
+}
+
+VCMEncodedFrame* VCMReceiver::FrameForDecoding(uint16_t max_wait_time_ms,
+                                               bool prefer_late_decoding) {
+  const int64_t start_time_ms = clock_->TimeInMilliseconds();
+  int64_t render_time_ms = 0;
+  // Exhaust wait time to get a complete frame for decoding.
+  VCMEncodedFrame* found_frame =
+      jitter_buffer_.NextCompleteFrame(max_wait_time_ms);
+
+  if (found_frame == nullptr) {
+    return nullptr;
+  }
+  uint32_t frame_timestamp = found_frame->RtpTimestamp();
+
+  if (absl::optional<VideoPlayoutDelay> playout_delay =
+          found_frame->EncodedImage().PlayoutDelay()) {
+    timing_->set_min_playout_delay(playout_delay->min());
+    timing_->set_max_playout_delay(playout_delay->max());
+  }
+
+  // We have a frame - Set timing and render timestamp.
+  timing_->SetJitterDelay(
+      TimeDelta::Millis(jitter_buffer_.EstimatedJitterMs()));
+  const Timestamp now = clock_->CurrentTime();
+  const int64_t now_ms = now.ms();
+  timing_->UpdateCurrentDelay(frame_timestamp);
+  render_time_ms = timing_->RenderTime(frame_timestamp, now).ms();
+  // Check render timing.
+  bool timing_error = false;
+  // Assume that render timing errors are due to changes in the video stream.
+  if (render_time_ms < 0) {
+    timing_error = true;
+  } else if (std::abs(render_time_ms - now_ms) > max_video_delay_ms_) {
+    int frame_delay = static_cast<int>(std::abs(render_time_ms - now_ms));
+    RTC_LOG(LS_WARNING)
+        << "A frame about to be decoded is out of the configured "
+           "delay bounds ("
+        << frame_delay << " > " << max_video_delay_ms_
+        << "). Resetting the video jitter buffer.";
+    timing_error = true;
+  } else if (static_cast<int>(timing_->TargetVideoDelay().ms()) >
+             max_video_delay_ms_) {
+    RTC_LOG(LS_WARNING) << "The video target delay has grown larger than "
+                        << max_video_delay_ms_
+                        << " ms. Resetting jitter buffer.";
+    timing_error = true;
+  }
+
+  if (timing_error) {
+    // Timing error => reset timing and flush the jitter buffer.
+    jitter_buffer_.Flush();
+    timing_->Reset();
+    return NULL;
+  }
+
+  if (prefer_late_decoding) {
+    // Decode frame as close as possible to the render timestamp.
+    const int32_t available_wait_time =
+        max_wait_time_ms -
+        static_cast<int32_t>(clock_->TimeInMilliseconds() - start_time_ms);
+    uint16_t new_max_wait_time =
+        static_cast<uint16_t>(VCM_MAX(available_wait_time, 0));
+    uint32_t wait_time_ms = rtc::saturated_cast<uint32_t>(
+        timing_
+            ->MaxWaitingTime(Timestamp::Millis(render_time_ms),
+                             clock_->CurrentTime(),
+                             /*too_many_frames_queued=*/false)
+            .ms());
+    if (new_max_wait_time < wait_time_ms) {
+      // We're not allowed to wait until the frame is supposed to be rendered,
+      // waiting as long as we're allowed to avoid busy looping, and then return
+      // NULL. Next call to this function might return the frame.
+      render_wait_event_->Wait(new_max_wait_time);
+      return NULL;
+    }
+    // Wait until it's time to render.
+    render_wait_event_->Wait(wait_time_ms);
+  }
+
+  // Extract the frame from the jitter buffer and set the render time.
+  VCMEncodedFrame* frame = jitter_buffer_.ExtractAndSetDecode(frame_timestamp);
+  if (frame == NULL) {
+    return NULL;
+  }
+  frame->SetRenderTime(render_time_ms);
+  TRACE_EVENT_ASYNC_STEP1("webrtc", "Video", frame->RtpTimestamp(),
+                          "SetRenderTS", "render_time", frame->RenderTimeMs());
+  return frame;
+}
+
+void VCMReceiver::ReleaseFrame(VCMEncodedFrame* frame) {
+  jitter_buffer_.ReleaseFrame(frame);
+}
+
+void VCMReceiver::SetNackSettings(size_t max_nack_list_size,
+                                  int max_packet_age_to_nack,
+                                  int max_incomplete_time_ms) {
+  jitter_buffer_.SetNackSettings(max_nack_list_size, max_packet_age_to_nack,
+                                 max_incomplete_time_ms);
+}
+
+std::vector<uint16_t> VCMReceiver::NackList(bool* request_key_frame) {
+  return jitter_buffer_.GetNackList(request_key_frame);
+}
+
+}  // namespace webrtc