Updated analysis in videoprocessor.

- Run analysis after all frames are processed. Before part of it was
done at bitrate change points;
- Analysis is done for whole stream as well as for each rate update
interval;
- Changed units from number of frames to time units for some metrics
and thresholds. E.g. 'num frames to hit tagret bitrate' is changed to
'time to reach target bitrate, sec';
- Changed data type of FrameStatistic::max_nalu_length (renamed to
max_nalu_size_bytes) from rtc::Optional to size_t. There it no need to
use such advanced data type in such low level data structure.

Bug: webrtc:8524
Change-Id: Ic9f6eab5b15ee12a80324b1f9c101de1bf3c702f
Reviewed-on: https://webrtc-review.googlesource.com/31901
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21653}

modules/video_coding/codecs/test/test_config.h

@@ -42,19 +42,20 @@ struct TestConfig {
   };
 
   void SetCodecSettings(VideoCodecType codec_type,
-                        int num_temporal_layers,
+                        size_t num_temporal_layers,
                         bool error_concealment_on,
                         bool denoising_on,
                         bool frame_dropper_on,
                         bool spatial_resize_on,
                         bool resilience_on,
-                        int width,
-                        int height);
+                        size_t width,
+                        size_t height);
 
-  int NumberOfCores() const;
-  int NumberOfTemporalLayers() const;
-  int TemporalLayerForFrame(int frame_idx) const;
-  std::vector<FrameType> FrameTypeForFrame(int frame_idx) const;
+  size_t NumberOfCores() const;
+  size_t NumberOfTemporalLayers() const;
+  size_t NumberOfSpatialLayers() const;
+  size_t TemporalLayerForFrame(size_t frame_idx) const;
+  std::vector<FrameType> FrameTypeForFrame(size_t frame_idx) const;
   std::string ToString() const;
   std::string CodecName() const;
   std::string FilenameWithParams() const;
@@ -70,7 +71,7 @@ struct TestConfig {
   std::string output_filename;
 
   // Number of frames to process.
-  int num_frames = 0;
+  size_t num_frames = 0;
 
   // Configurations related to networking.
   NetworkingConfig networking_config;
@@ -96,7 +97,7 @@ struct TestConfig {
   // to this setting. Forcing key frames may also affect encoder planning
   // optimizations in a negative way, since it will suddenly be forced to
   // produce an expensive key frame.
-  int keyframe_interval = 0;
+  size_t keyframe_interval = 0;
 
   // Codec settings to use.
   webrtc::VideoCodec codec_settings;
@@ -118,6 +119,9 @@ struct TestConfig {
 
   // Custom checker that will be called for each frame.
   const EncodedFrameChecker* encoded_frame_checker = nullptr;
+
+  // Print out frame level stats.
+  bool print_frame_level_stats = false;
 };
 
 }  // namespace test