gecko/content/media/StreamBuffer.cpp

61 lines
1.5 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "StreamBuffer.h"
namespace mozilla {
StreamTime
StreamBuffer::GetEnd() const
{
StreamTime t = mTracksKnownTime;
for (PRUint32 i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (!track->IsEnded()) {
t = NS_MIN(t, track->GetEndTimeRoundDown());
}
}
return t;
}
StreamBuffer::Track*
StreamBuffer::FindTrack(TrackID aID)
{
if (aID == TRACK_NONE)
return nsnull;
for (PRUint32 i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (track->GetID() == aID) {
return track;
}
}
return nsnull;
}
void
StreamBuffer::ForgetUpTo(StreamTime aTime)
{
// Round to nearest 50ms so we don't spend too much time pruning segments.
const int roundTo = MillisecondsToMediaTime(50);
StreamTime forget = (aTime/roundTo)*roundTo;
if (forget <= mForgottenTime) {
return;
}
mForgottenTime = forget;
for (PRUint32 i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (track->IsEnded() && track->GetEndTimeRoundDown() <= forget) {
mTracks.RemoveElementAt(i);
--i;
continue;
}
TrackTicks forgetTo = NS_MIN(track->GetEnd() - 1, track->TimeToTicksRoundDown(forget));
track->ForgetUpTo(forgetTo);
}
}
}