dom/media/MediaTrackListener.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 "MediaTrackListener.h"
   7
   8 #include "AudioSegment.h"
   9 #include "VideoSegment.h"
  10
  11 namespace mozilla {
  12
  13 #ifdef LOG
  14 #  undef LOG
  15 #endif
  16
  17 #define LOG(type, msg) MOZ_LOG(gMediaTrackGraphLog, type, msg)
  18
  19 void DirectMediaTrackListener::MirrorAndDisableSegment(AudioSegment& aFrom,
  20                                                        AudioSegment& aTo) {
  21   aTo.AppendNullData(aFrom.GetDuration());
  22 }
  23
  24 void DirectMediaTrackListener::MirrorAndDisableSegment(
  25     VideoSegment& aFrom, VideoSegment& aTo, DisabledTrackMode aMode) {
  26   if (aMode == DisabledTrackMode::SILENCE_BLACK) {
  27     for (VideoSegment::ChunkIterator it(aFrom); !it.IsEnded(); it.Next()) {
  28       aTo.AppendFrame(do_AddRef(it->mFrame.GetImage()),
  29                       it->mFrame.GetIntrinsicSize(), it->GetPrincipalHandle(),
  30                       true);
  31       aTo.ExtendLastFrameBy(it->GetDuration());
  32     }
  33   } else if (aMode == DisabledTrackMode::SILENCE_FREEZE) {
  34     aTo.AppendNullData(aFrom.GetDuration());
  35   }
  36 }
  37
  38 void DirectMediaTrackListener::NotifyRealtimeTrackDataAndApplyTrackDisabling(
  39     MediaTrackGraph* aGraph, TrackTime aTrackOffset, MediaSegment& aMedia) {
  40   if (mDisabledFreezeCount == 0 && mDisabledBlackCount == 0) {
  41     NotifyRealtimeTrackData(aGraph, aTrackOffset, aMedia);
  42     return;
  43   }
  44
  45   DisabledTrackMode mode = mDisabledBlackCount > 0
  46                                ? DisabledTrackMode::SILENCE_BLACK
  47                                : DisabledTrackMode::SILENCE_FREEZE;
  48   UniquePtr<MediaSegment> media(aMedia.CreateEmptyClone());
  49   if (aMedia.GetType() == MediaSegment::AUDIO) {
  50     MirrorAndDisableSegment(static_cast<AudioSegment&>(aMedia),
  51                             static_cast<AudioSegment&>(*media));
  52   } else if (aMedia.GetType() == MediaSegment::VIDEO) {
  53     MirrorAndDisableSegment(static_cast<VideoSegment&>(aMedia),
  54                             static_cast<VideoSegment&>(*media), mode);
  55   } else {
  56     MOZ_CRASH("Unsupported media type");
  57   }
  58   NotifyRealtimeTrackData(aGraph, aTrackOffset, *media);
  59 }
  60
  61 void DirectMediaTrackListener::IncreaseDisabled(DisabledTrackMode aMode) {
  62   if (aMode == DisabledTrackMode::SILENCE_FREEZE) {
  63     ++mDisabledFreezeCount;
  64   } else if (aMode == DisabledTrackMode::SILENCE_BLACK) {
  65     ++mDisabledBlackCount;
  66   } else {
  67     MOZ_ASSERT(false, "Unknown disabled mode");
  68   }
  69
  70   LOG(LogLevel::Debug,
  71       ("DirectMediaTrackListener %p increased disabled "
  72        "mode %s. Current counts are: freeze=%d, black=%d",
  73        this, aMode == DisabledTrackMode::SILENCE_FREEZE ? "freeze" : "black",
  74        int32_t(mDisabledFreezeCount), int32_t(mDisabledBlackCount)));
  75 }
  76
  77 void DirectMediaTrackListener::DecreaseDisabled(DisabledTrackMode aMode) {
  78   if (aMode == DisabledTrackMode::SILENCE_FREEZE) {
  79     --mDisabledFreezeCount;
  80     MOZ_ASSERT(mDisabledFreezeCount >= 0, "Double decrease");
  81   } else if (aMode == DisabledTrackMode::SILENCE_BLACK) {
  82     --mDisabledBlackCount;
  83     MOZ_ASSERT(mDisabledBlackCount >= 0, "Double decrease");
  84   } else {
  85     MOZ_ASSERT(false, "Unknown disabled mode");
  86   }
  87
  88   LOG(LogLevel::Debug,
  89       ("DirectMediaTrackListener %p decreased disabled "
  90        "mode %s. Current counts are: freeze=%d, black=%d",
  91        this, aMode == DisabledTrackMode::SILENCE_FREEZE ? "freeze" : "black",
  92        int32_t(mDisabledFreezeCount), int32_t(mDisabledBlackCount)));
  93 }
  94
  95 }  // namespace mozilla