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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_CAST_SENDER_PERFORMANCE_METRICS_OVERLAY_H_
#define MEDIA_CAST_SENDER_PERFORMANCE_METRICS_OVERLAY_H_
#include "base/time/time.h"
// This module provides a display of frame-level performance metrics, rendered
// in the lower-right corner of a VideoFrame. It looks like this:
//
// +---------------------------------------------------------------------+
// | @@@@@@@@@@@@@@@@@@@@@@@ |
// | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
// | @@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@ |
// | @@@@@@@@@@@@@ @@@@ |
// | @@@@@@@@@@ @@@@ |
// | @@@@@ @@@ @@@ @@@@ |
// | @@@ @ @@@ @@@@ @@@@ |
// | @@@@ @@@@ @@@@ |
// | @@@@ @@@ @@@ |
// | @@@@ @@ @@@ |
// | @@@@@ @@@ @@@ @@@ |
// | @@@@@ @@@@@ @@@@ @@@@ |
// | @@@@@ @@@@@@@@@@@@@ @@@@ |
// | @@@@@@ @@@@ 1 45% 75% |
// | @@@@@@@@ @@@@@@ 22 400. 4000 |
// | @@@@@@@@@@@@@@@@ 16.7 1280x720 0:15.12 |
// +---------------------------------------------------------------------+
//
// Line 1: Reads as, "1 frame ago, the encoder deadline utilization for the
// frame was 45% and the lossy utilization was 75%." Encoder deadline
// utilization is in terms the amount of real-world time it took to encode the
// frame, divided by the maximum amount of time allowed. Lossy utilization is
// the amount of "complexity" in the frame's content versus the target encoded
// byte size, where a value over 100% means the frame's content is too complex
// to encode within the target number of bytes.
//
// Line 2: Reads as, "Capture of this frame took 22 ms. The current target
// playout delay is 400 ms and low-latency adjustment mode is not active. The
// target bitrate for this frame is 4000 kbps." If there were an exclamation
// mark (!) after the playout delay number instead of a period (.), it would
// indicate low-latency adjustment mode is active. See VideoSender for more
// details.
//
// Line 3: Contains the frame's duration (16.7 milliseconds), resolution, and
// media timestamp in minutes:seconds.hundredths format.
namespace media {
class VideoFrame;
namespace cast {
// Renders an overlay of frame-level performance metrics in the lower-right
// corner of the |frame|, as described above. The verbose logging level for
// video_frame_overlay.cc determines which lines, if any, are rendered: VLOG
// level 1 renders the bottom line only, level 2 renders the bottom and middle
// lines, and level 3 renders all three lines. So, use the
// --vmodule=performance_metrics_overlay=3 command line argument to turn on
// rendering of the entire overlay.
void MaybeRenderPerformanceMetricsOverlay(base::TimeDelta target_playout_delay,
bool in_low_latency_mode,
int target_bitrate,
int frames_ago,
double deadline_utilization,
double lossy_utilization,
VideoFrame* frame);
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_SENDER_PERFORMANCE_METRICS_OVERLAY_H_
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