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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "FFmpegDecodeStats.h"
#include "FFmpegLog.h"
#include "mozilla/Casting.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/TimeStamp.h"
namespace mozilla {
void FFmpegDecodeStats::DecodeStart() { mDecodeStart = TimeStamp::Now(); }
bool FFmpegDecodeStats::IsDecodingSlow() const {
return mDecodedFramesLate > kMaxLateDecodedFrames;
}
void FFmpegDecodeStats::UpdateDecodeTimes(int64_t aDuration) {
TimeStamp now = TimeStamp::Now();
double decodeTime = (now - mDecodeStart).ToMilliseconds();
mDecodeStart = now;
const double frameDuration = AssertedCast<double>(aDuration) / 1000.0;
if (frameDuration <= 0.0) {
FFMPEGV_LOG("Incorrect frame duration, skipping decode stats.");
return;
}
mAverageFrameDuration.insert(frameDuration);
mAverageFrameDecodeTime.insert(decodeTime);
FFMPEGV_LOG(
"Frame decode takes {:.2f} ms average decode time {:.2f} ms frame "
"duration "
"{:.2f} average frame duration {:.2f} decoded {} frames\n",
decodeTime, mAverageFrameDecodeTime.mean(), frameDuration,
mAverageFrameDuration.mean(), mAverageFrameDuration.count());
// Frame duration and frame decode times may vary and may not
// neccessarily lead to video playback failure.
//
// Checks frame decode time and recent frame duration and also
// frame decode time and average frame duration (video fps).
//
// Log a problem only if both indicators fails.
if (decodeTime > frameDuration && decodeTime > mAverageFrameDuration.mean()) {
PROFILER_MARKER_TEXT("FFmpegVideoDecoder::DoDecode", MEDIA_PLAYBACK, {},
"frame decode takes too long");
mDecodedFramesLate++;
mLastDelayedFrameNum = mAverageFrameDuration.count();
FFMPEGV_LOG(" slow decode: failed to decode in time (decoded late {})",
mDecodedFramesLate);
} else if (mLastDelayedFrameNum) {
// Reset mDecodedFramesLate in case of correct decode during
// mDelayedFrameReset period.
double correctPlaybackTime =
AssertedCast<double>(mAverageFrameDuration.count() -
mLastDelayedFrameNum) *
mAverageFrameDuration.mean();
if (correctPlaybackTime > mDelayedFrameReset) {
FFMPEGV_LOG(" mLastFramePts reset due to seamless decode period");
mDecodedFramesLate = 0;
mLastDelayedFrameNum = 0;
}
}
}
} // namespace mozilla