mirror of
https://github.com/mozilla/gecko-dev.git
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118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "StreamBuffer.h"
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#include "prlog.h"
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#include <algorithm>
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namespace mozilla {
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extern PRLogModuleInfo* gMediaStreamGraphLog;
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#define STREAM_LOG(type, msg) PR_LOG(gMediaStreamGraphLog, type, msg)
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#ifdef DEBUG
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void
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StreamBuffer::DumpTrackInfo() const
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{
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STREAM_LOG(PR_LOG_ALWAYS, ("DumpTracks: mTracksKnownTime %lld", mTracksKnownTime));
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for (uint32_t i = 0; i < mTracks.Length(); ++i) {
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Track* track = mTracks[i];
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if (track->IsEnded()) {
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STREAM_LOG(PR_LOG_ALWAYS, ("Track[%d] %d: ended", i, track->GetID()));
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} else {
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STREAM_LOG(PR_LOG_ALWAYS, ("Track[%d] %d: %lld", i, track->GetID(),
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track->GetEnd()));
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}
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}
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}
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#endif
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StreamTime
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StreamBuffer::GetEnd() const
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{
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StreamTime t = mTracksKnownTime;
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for (uint32_t i = 0; i < mTracks.Length(); ++i) {
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Track* track = mTracks[i];
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if (!track->IsEnded()) {
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t = std::min(t, track->GetEnd());
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}
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}
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return t;
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}
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StreamTime
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StreamBuffer::GetAllTracksEnd() const
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{
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if (mTracksKnownTime < STREAM_TIME_MAX) {
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// A track might be added.
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return STREAM_TIME_MAX;
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}
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StreamTime t = 0;
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for (uint32_t i = 0; i < mTracks.Length(); ++i) {
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Track* track = mTracks[i];
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if (!track->IsEnded()) {
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return STREAM_TIME_MAX;
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}
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t = std::max(t, track->GetEnd());
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}
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return t;
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}
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StreamBuffer::Track*
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StreamBuffer::FindTrack(TrackID aID)
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{
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if (aID == TRACK_NONE || mTracks.IsEmpty()) {
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return nullptr;
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}
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// The tracks are sorted by ID. We can use a binary search.
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uint32_t left = 0, right = mTracks.Length() - 1;
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while (left <= right) {
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uint32_t middle = (left + right) / 2;
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if (mTracks[middle]->GetID() == aID) {
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return mTracks[middle];
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}
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if (mTracks[middle]->GetID() > aID) {
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if (middle == 0) {
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break;
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}
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right = middle - 1;
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} else {
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left = middle + 1;
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}
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}
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return nullptr;
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}
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void
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StreamBuffer::ForgetUpTo(StreamTime aTime)
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{
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// Only prune if there is a reasonable chunk (50ms @ 48kHz) to forget, so we
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// don't spend too much time pruning segments.
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const StreamTime minChunkSize = 2400;
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if (aTime < mForgottenTime + minChunkSize) {
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return;
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}
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mForgottenTime = aTime;
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for (uint32_t i = 0; i < mTracks.Length(); ++i) {
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Track* track = mTracks[i];
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if (track->IsEnded() && track->GetEnd() <= aTime) {
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mTracks.RemoveElementAt(i);
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mTracksDirty = true;
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--i;
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continue;
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}
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StreamTime forgetTo = std::min(track->GetEnd() - 1, aTime);
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track->ForgetUpTo(forgetTo);
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}
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}
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}
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