content/media/StreamBuffer.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   4  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "StreamBuffer.h"
   7 #include "prlog.h"
   8 #include <algorithm>
   9
  10 namespace mozilla {
  11
  12 #ifdef PR_LOGGING
  13 extern PRLogModuleInfo* gMediaStreamGraphLog;
  14 #define STREAM_LOG(type, msg) PR_LOG(gMediaStreamGraphLog, type, msg)
  15 #else
  16 #define STREAM_LOG(type, msg)
  17 #endif
  18
  19 #ifdef DEBUG
  20 void
  21 StreamBuffer::DumpTrackInfo() const
  22 {
  23   STREAM_LOG(PR_LOG_ALWAYS, ("DumpTracks: mTracksKnownTime %lld", mTracksKnownTime));
  24   for (uint32_t i = 0; i < mTracks.Length(); ++i) {
  25     Track* track = mTracks[i];
  26     if (track->IsEnded()) {
  27       STREAM_LOG(PR_LOG_ALWAYS, ("Track[%d] %d: ended", i, track->GetID()));
  28     } else {
  29       STREAM_LOG(PR_LOG_ALWAYS, ("Track[%d] %d: %lld", i, track->GetID(),
  30                                  track->GetEndTimeRoundDown()));
  31     }
  32   }
  33 }
  34 #endif
  35
  36 StreamTime
  37 StreamBuffer::GetEnd() const
  38 {
  39   StreamTime t = mTracksKnownTime;
  40   for (uint32_t i = 0; i < mTracks.Length(); ++i) {
  41     Track* track = mTracks[i];
  42     if (!track->IsEnded()) {
  43       t = std::min(t, track->GetEndTimeRoundDown());
  44     }
  45   }
  46   return t;
  47 }
  48
  49 StreamBuffer::Track*
  50 StreamBuffer::FindTrack(TrackID aID)
  51 {
  52   if (aID == TRACK_NONE)
  53     return nullptr;
  54   for (uint32_t i = 0; i < mTracks.Length(); ++i) {
  55     Track* track = mTracks[i];
  56     if (track->GetID() == aID) {
  57       return track;
  58     }
  59   }
  60   return nullptr;
  61 }
  62
  63 void
  64 StreamBuffer::ForgetUpTo(StreamTime aTime)
  65 {
  66   // Round to nearest 50ms so we don't spend too much time pruning segments.
  67   const MediaTime roundTo = MillisecondsToMediaTime(50);
  68   StreamTime forget = (aTime/roundTo)*roundTo;
  69   if (forget <= mForgottenTime) {
  70     return;
  71   }
  72   mForgottenTime = forget;
  73
  74   for (uint32_t i = 0; i < mTracks.Length(); ++i) {
  75     Track* track = mTracks[i];
  76     if (track->IsEnded() && track->GetEndTimeRoundDown() <= forget) {
  77       mTracks.RemoveElementAt(i);
  78       --i;
  79       continue;
  80     }
  81     TrackTicks forgetTo = std::min(track->GetEnd() - 1, track->TimeToTicksRoundDown(forget));
  82     track->ForgetUpTo(forgetTo);
  83   }
  84 }
  85
  86 }