Introduce ExampleVideoQualityAnalyzer.

This analyzer will be used in implementatino of peer connection level
test framework before main analyzer will be implemented.

Bug: webrtc:10138
Change-Id: Ibb7c5cd94b0f07c6fc5a2415f04b0f0ae7ae75e2
Reviewed-on: https://webrtc-review.googlesource.com/c/117221
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26301}

test/pc/e2e/BUILD.gn

@@ -14,6 +14,7 @@ group("e2e") {
   deps = [
     ":default_encoded_image_id_injector",
     ":encoded_image_id_injector_api",
+    ":example_video_quality_analyzer",
     ":single_process_encoded_image_id_injector",
   ]
 }
@@ -99,3 +100,20 @@ if (rtc_include_tests) {
     ]
   }
 }
+
+rtc_source_set("example_video_quality_analyzer") {
+  visibility = [ "*" ]
+  testonly = true
+  sources = [
+    "analyzer/video/example_video_quality_analyzer.cc",
+    "analyzer/video/example_video_quality_analyzer.h",
+  ]
+
+  deps = [
+    "../../../api/video:encoded_image",
+    "../../../api/video:video_frame",
+    "../../../rtc_base:criticalsection",
+    "../../../rtc_base:logging",
+    "api:video_quality_analyzer_api",
+  ]
+}

test/pc/e2e/analyzer/video/example_video_quality_analyzer.cc

@@ -0,0 +1,124 @@
+/*
+ *  Copyright (c) 2019 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 "test/pc/e2e/analyzer/video/example_video_quality_analyzer.h"
+
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+namespace test {
+
+ExampleVideoQualityAnalyzer::ExampleVideoQualityAnalyzer() = default;
+ExampleVideoQualityAnalyzer::~ExampleVideoQualityAnalyzer() = default;
+
+void ExampleVideoQualityAnalyzer::Start(int max_threads_count) {}
+
+uint16_t ExampleVideoQualityAnalyzer::OnFrameCaptured(
+    const std::string& stream_label,
+    const webrtc::VideoFrame& frame) {
+  rtc::CritScope crit(&lock_);
+  uint16_t frame_id = next_frame_id_++;
+  auto it = frames_in_flight_.find(frame_id);
+  if (it == frames_in_flight_.end()) {
+    frames_in_flight_.insert(frame_id);
+  } else {
+    RTC_LOG(WARNING) << "Meet new frame with the same id: " << frame_id
+                     << ". Assumes old one as dropped";
+    // We needn't insert frame to frames_in_flight_, because it is already
+    // there.
+    ++frames_dropped_;
+  }
+  ++frames_captured_;
+  return frame_id;
+}
+
+void ExampleVideoQualityAnalyzer::OnFramePreEncode(
+    const webrtc::VideoFrame& frame) {}
+
+void ExampleVideoQualityAnalyzer::OnFrameEncoded(
+    uint16_t frame_id,
+    const webrtc::EncodedImage& encoded_image) {
+  rtc::CritScope crit(&lock_);
+  ++frames_sent_;
+}
+
+void ExampleVideoQualityAnalyzer::OnFrameDropped(
+    webrtc::EncodedImageCallback::DropReason reason) {
+  RTC_LOG(INFO) << "Frame dropped by encoder";
+  rtc::CritScope crit(&lock_);
+  ++frames_dropped_;
+}
+
+void ExampleVideoQualityAnalyzer::OnFrameReceived(
+    uint16_t frame_id,
+    const webrtc::EncodedImage& encoded_image) {
+  rtc::CritScope crit(&lock_);
+  ++frames_received_;
+}
+
+void ExampleVideoQualityAnalyzer::OnFrameDecoded(
+    const webrtc::VideoFrame& frame,
+    absl::optional<int32_t> decode_time_ms,
+    absl::optional<uint8_t> qp) {}
+
+void ExampleVideoQualityAnalyzer::OnFrameRendered(
+    const webrtc::VideoFrame& frame) {
+  rtc::CritScope crit(&lock_);
+  frames_in_flight_.erase(frame.id());
+  ++frames_rendered_;
+}
+
+void ExampleVideoQualityAnalyzer::OnEncoderError(
+    const webrtc::VideoFrame& frame,
+    int32_t error_code) {
+  RTC_LOG(LS_ERROR) << "Failed to encode frame " << frame.id()
+                    << ". Code: " << error_code;
+}
+
+void ExampleVideoQualityAnalyzer::OnDecoderError(uint16_t frame_id,
+                                                 int32_t error_code) {
+  RTC_LOG(LS_ERROR) << "Failed to decode frame " << frame_id
+                    << ". Code: " << error_code;
+}
+
+void ExampleVideoQualityAnalyzer::Stop() {
+  rtc::CritScope crit(&lock_);
+  RTC_LOG(INFO) << "There are " << frames_in_flight_.size()
+                << " frames in flight, assuming all of them are dropped";
+  frames_dropped_ += frames_in_flight_.size();
+}
+
+uint64_t ExampleVideoQualityAnalyzer::frames_captured() const {
+  rtc::CritScope crit(&lock_);
+  return frames_captured_;
+}
+
+uint64_t ExampleVideoQualityAnalyzer::frames_sent() const {
+  rtc::CritScope crit(&lock_);
+  return frames_sent_;
+}
+
+uint64_t ExampleVideoQualityAnalyzer::frames_received() const {
+  rtc::CritScope crit(&lock_);
+  return frames_received_;
+}
+
+uint64_t ExampleVideoQualityAnalyzer::frames_dropped() const {
+  rtc::CritScope crit(&lock_);
+  return frames_dropped_;
+}
+
+uint64_t ExampleVideoQualityAnalyzer::frames_rendered() const {
+  rtc::CritScope crit(&lock_);
+  return frames_rendered_;
+}
+
+}  // namespace test
+}  // namespace webrtc

test/pc/e2e/analyzer/video/example_video_quality_analyzer.h

@@ -0,0 +1,80 @@
+/*
+ *  Copyright (c) 2019 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.
+ */
+
+#ifndef TEST_PC_E2E_ANALYZER_VIDEO_EXAMPLE_VIDEO_QUALITY_ANALYZER_H_
+#define TEST_PC_E2E_ANALYZER_VIDEO_EXAMPLE_VIDEO_QUALITY_ANALYZER_H_
+
+#include <atomic>
+#include <set>
+#include <string>
+
+#include "api/video/encoded_image.h"
+#include "api/video/video_frame.h"
+#include "rtc_base/critical_section.h"
+#include "test/pc/e2e/api/video_quality_analyzer_interface.h"
+
+namespace webrtc {
+namespace test {
+
+// This class is an example implementation of
+// webrtc::VideoQualityAnalyzerInterface and calculates simple metrics
+// just to demonstration purposes. Assumed to be used in the single process
+// test cases, where both peers are in the same process.
+class ExampleVideoQualityAnalyzer : public VideoQualityAnalyzerInterface {
+ public:
+  ExampleVideoQualityAnalyzer();
+  ~ExampleVideoQualityAnalyzer() override;
+
+  void Start(int max_threads_count) override;
+  uint16_t OnFrameCaptured(const std::string& stream_label,
+                           const VideoFrame& frame) override;
+  void OnFramePreEncode(const VideoFrame& frame) override;
+  void OnFrameEncoded(uint16_t frame_id,
+                      const EncodedImage& encoded_image) override;
+  void OnFrameDropped(EncodedImageCallback::DropReason reason) override;
+  void OnFrameReceived(uint16_t frame_id,
+                       const EncodedImage& encoded_image) override;
+  void OnFrameDecoded(const VideoFrame& frame,
+                      absl::optional<int32_t> decode_time_ms,
+                      absl::optional<uint8_t> qp) override;
+  void OnFrameRendered(const VideoFrame& frame) override;
+  void OnEncoderError(const VideoFrame& frame, int32_t error_code) override;
+  void OnDecoderError(uint16_t frame_id, int32_t error_code) override;
+  void Stop() override;
+
+  uint64_t frames_captured() const;
+  uint64_t frames_sent() const;
+  uint64_t frames_received() const;
+  uint64_t frames_dropped() const;
+  uint64_t frames_rendered() const;
+
+ private:
+  // When peer A captured the frame it will come into analyzer's OnFrameCaptured
+  // and will be stored in frames_in_flight_. It will be removed from there
+  // when it will be received in peer B, so we need to guard it with lock.
+  // Also because analyzer will serve for all video streams it can be called
+  // from different threads inside one peer.
+  rtc::CriticalSection lock_;
+  // Stores frame ids, that are currently going from one peer to another. We
+  // need to keep them to correctly determine dropped frames and also correctly
+  // process frame id overlap.
+  std::set<uint16_t> frames_in_flight_ RTC_GUARDED_BY(lock_);
+  uint16_t next_frame_id_ RTC_GUARDED_BY(lock_) = 0;
+  uint64_t frames_captured_ RTC_GUARDED_BY(lock_) = 0;
+  uint64_t frames_sent_ RTC_GUARDED_BY(lock_) = 0;
+  uint64_t frames_received_ RTC_GUARDED_BY(lock_) = 0;
+  uint64_t frames_dropped_ RTC_GUARDED_BY(lock_) = 0;
+  uint64_t frames_rendered_ RTC_GUARDED_BY(lock_) = 0;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_PC_E2E_ANALYZER_VIDEO_EXAMPLE_VIDEO_QUALITY_ANALYZER_H_