gecko/content/media/StreamBuffer.cpp
Karl Tomlinson ed2450c4a3 b=1023697 simplify StreamBuffer::ForgetUpTo() to avoid graph-rate-dependent conversions r=roc
--HG--
extra : transplant_source : %16%9C%08%CA%3E%DD%82%21%D2%90%7D%29%FB%D9L%9E%F8%2A%CBd
2014-06-12 16:44:59 +12:00

105 lines
2.6 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"
#include "prlog.h"
#include <algorithm>
namespace mozilla {
#ifdef PR_LOGGING
extern PRLogModuleInfo* gMediaStreamGraphLog;
#define STREAM_LOG(type, msg) PR_LOG(gMediaStreamGraphLog, type, msg)
#else
#define STREAM_LOG(type, msg)
#endif
#ifdef DEBUG
void
StreamBuffer::DumpTrackInfo() const
{
STREAM_LOG(PR_LOG_ALWAYS, ("DumpTracks: mTracksKnownTime %lld", mTracksKnownTime));
for (uint32_t i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (track->IsEnded()) {
STREAM_LOG(PR_LOG_ALWAYS, ("Track[%d] %d: ended", i, track->GetID()));
} else {
STREAM_LOG(PR_LOG_ALWAYS, ("Track[%d] %d: %lld", i, track->GetID(),
track->GetEndTimeRoundDown()));
}
}
}
#endif
StreamTime
StreamBuffer::GetEnd() const
{
StreamTime t = mTracksKnownTime;
for (uint32_t i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (!track->IsEnded()) {
t = std::min(t, track->GetEndTimeRoundDown());
}
}
return t;
}
StreamTime
StreamBuffer::GetAllTracksEnd() const
{
if (mTracksKnownTime < STREAM_TIME_MAX) {
// A track might be added.
return STREAM_TIME_MAX;
}
StreamTime t = 0;
for (uint32_t i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (!track->IsEnded()) {
return STREAM_TIME_MAX;
}
t = std::max(t, track->GetEndTimeRoundDown());
}
return t;
}
StreamBuffer::Track*
StreamBuffer::FindTrack(TrackID aID)
{
if (aID == TRACK_NONE)
return nullptr;
for (uint32_t i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (track->GetID() == aID) {
return track;
}
}
return nullptr;
}
void
StreamBuffer::ForgetUpTo(StreamTime aTime)
{
// Only prune if there is a reasonable chunk (50ms @ 48kHz) to forget, so we
// don't spend too much time pruning segments.
const StreamTime minChunkSize = 2400;
if (aTime < mForgottenTime + minChunkSize) {
return;
}
mForgottenTime = aTime;
for (uint32_t i = 0; i < mTracks.Length(); ++i) {
Track* track = mTracks[i];
if (track->IsEnded() && track->GetEndTimeRoundDown() <= aTime) {
mTracks.RemoveElementAt(i);
--i;
continue;
}
TrackTicks forgetTo = std::min(track->GetEnd() - 1, track->TimeToTicksRoundDown(aTime));
track->ForgetUpTo(forgetTo);
}
}
}