summaryrefslogtreecommitdiffstats
path: root/dom/media/webvtt/TextTrack.cpp
blob: 7a5b398d2d65627a297210824d8900be8fbc6177 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 et tw=78: */
/* 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 "mozilla/AsyncEventDispatcher.h"
#include "mozilla/dom/TextTrack.h"
#include "mozilla/dom/TextTrackBinding.h"
#include "mozilla/dom/TextTrackList.h"
#include "mozilla/dom/TextTrackCue.h"
#include "mozilla/dom/TextTrackCueList.h"
#include "mozilla/dom/TextTrackRegion.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/HTMLTrackElement.h"
#include "nsGlobalWindowInner.h"

extern mozilla::LazyLogModule gTextTrackLog;

#define WEBVTT_LOG(msg, ...)              \
  MOZ_LOG(gTextTrackLog, LogLevel::Debug, \
          ("TextTrack=%p, " msg, this, ##__VA_ARGS__))

namespace mozilla::dom {

static const char* ToReadyStateStr(const TextTrackReadyState aState) {
  switch (aState) {
    case TextTrackReadyState::NotLoaded:
      return "NotLoaded";
    case TextTrackReadyState::Loading:
      return "Loading";
    case TextTrackReadyState::Loaded:
      return "Loaded";
    case TextTrackReadyState::FailedToLoad:
      return "FailedToLoad";
    default:
      MOZ_ASSERT_UNREACHABLE("Invalid state.");
  }
  return "Unknown";
}

NS_IMPL_CYCLE_COLLECTION_INHERITED(TextTrack, DOMEventTargetHelper, mCueList,
                                   mActiveCueList, mTextTrackList,
                                   mTrackElement)

NS_IMPL_ADDREF_INHERITED(TextTrack, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(TextTrack, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TextTrack)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

TextTrack::TextTrack(nsPIDOMWindowInner* aOwnerWindow, TextTrackKind aKind,
                     const nsAString& aLabel, const nsAString& aLanguage,
                     TextTrackMode aMode, TextTrackReadyState aReadyState,
                     TextTrackSource aTextTrackSource)
    : DOMEventTargetHelper(aOwnerWindow),
      mKind(aKind),
      mLabel(aLabel),
      mLanguage(aLanguage),
      mMode(aMode),
      mReadyState(aReadyState),
      mTextTrackSource(aTextTrackSource) {
  SetDefaultSettings();
}

TextTrack::TextTrack(nsPIDOMWindowInner* aOwnerWindow,
                     TextTrackList* aTextTrackList, TextTrackKind aKind,
                     const nsAString& aLabel, const nsAString& aLanguage,
                     TextTrackMode aMode, TextTrackReadyState aReadyState,
                     TextTrackSource aTextTrackSource)
    : DOMEventTargetHelper(aOwnerWindow),
      mTextTrackList(aTextTrackList),
      mKind(aKind),
      mLabel(aLabel),
      mLanguage(aLanguage),
      mMode(aMode),
      mReadyState(aReadyState),
      mTextTrackSource(aTextTrackSource) {
  SetDefaultSettings();
}

TextTrack::~TextTrack() = default;

void TextTrack::SetDefaultSettings() {
  nsPIDOMWindowInner* ownerWindow = GetOwner();
  mCueList = new TextTrackCueList(ownerWindow);
  mActiveCueList = new TextTrackCueList(ownerWindow);
  mCuePos = 0;
  mDirty = false;
}

JSObject* TextTrack::WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto) {
  return TextTrack_Binding::Wrap(aCx, this, aGivenProto);
}

void TextTrack::SetMode(TextTrackMode aValue) {
  if (mMode == aValue) {
    return;
  }
  WEBVTT_LOG("Set mode=%s for track kind %s", GetEnumString(aValue).get(),
             GetEnumString(mKind).get());
  mMode = aValue;

  HTMLMediaElement* mediaElement = GetMediaElement();
  if (aValue == TextTrackMode::Disabled) {
    for (size_t i = 0; i < mCueList->Length() && mediaElement; ++i) {
      mediaElement->NotifyCueRemoved(*(*mCueList)[i]);
    }
    SetCuesInactive();
  } else {
    for (size_t i = 0; i < mCueList->Length() && mediaElement; ++i) {
      mediaElement->NotifyCueAdded(*(*mCueList)[i]);
    }
  }
  if (mediaElement) {
    mediaElement->NotifyTextTrackModeChanged();
  }
  // https://html.spec.whatwg.org/multipage/media.html#sourcing-out-of-band-text-tracks:start-the-track-processing-model
  // Run the `start-the-track-processing-model` to track's corresponding track
  // element whenever track's mode changes.
  if (mTrackElement) {
    mTrackElement->MaybeDispatchLoadResource();
  }
  // Ensure the TimeMarchesOn is called in case that the mCueList
  // is empty.
  NotifyCueUpdated(nullptr);
}

void TextTrack::GetId(nsAString& aId) const {
  // If the track has a track element then its id should be the same as the
  // track element's id.
  if (mTrackElement) {
    mTrackElement->GetAttr(nsGkAtoms::id, aId);
  }
}

void TextTrack::AddCue(TextTrackCue& aCue) {
  WEBVTT_LOG("AddCue %p [%f:%f]", &aCue, aCue.StartTime(), aCue.EndTime());
  TextTrack* oldTextTrack = aCue.GetTrack();
  if (oldTextTrack) {
    ErrorResult dummy;
    oldTextTrack->RemoveCue(aCue, dummy);
  }
  mCueList->AddCue(aCue);
  aCue.SetTrack(this);
  HTMLMediaElement* mediaElement = GetMediaElement();
  if (mediaElement && (mMode != TextTrackMode::Disabled)) {
    mediaElement->NotifyCueAdded(aCue);
  }
}

void TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv) {
  WEBVTT_LOG("RemoveCue %p", &aCue);
  // Bug1304948, check the aCue belongs to the TextTrack.
  mCueList->RemoveCue(aCue, aRv);
  if (aRv.Failed()) {
    return;
  }
  aCue.SetActive(false);
  aCue.SetTrack(nullptr);
  HTMLMediaElement* mediaElement = GetMediaElement();
  if (mediaElement) {
    mediaElement->NotifyCueRemoved(aCue);
  }
}

void TextTrack::ClearAllCues() {
  WEBVTT_LOG("ClearAllCues");
  ErrorResult dummy;
  while (!mCueList->IsEmpty()) {
    RemoveCue(*(*mCueList)[0], dummy);
  }
}

void TextTrack::SetCuesDirty() {
  for (uint32_t i = 0; i < mCueList->Length(); i++) {
    ((*mCueList)[i])->Reset();
  }
}

TextTrackCueList* TextTrack::GetActiveCues() {
  if (mMode != TextTrackMode::Disabled) {
    return mActiveCueList;
  }
  return nullptr;
}

void TextTrack::GetActiveCueArray(nsTArray<RefPtr<TextTrackCue> >& aCues) {
  if (mMode != TextTrackMode::Disabled) {
    mActiveCueList->GetArray(aCues);
  }
}

TextTrackReadyState TextTrack::ReadyState() const { return mReadyState; }

void TextTrack::SetReadyState(TextTrackReadyState aState) {
  WEBVTT_LOG("SetReadyState=%s", ToReadyStateStr(aState));
  mReadyState = aState;
  HTMLMediaElement* mediaElement = GetMediaElement();
  if (mediaElement && (mReadyState == TextTrackReadyState::Loaded ||
                       mReadyState == TextTrackReadyState::FailedToLoad)) {
    mediaElement->RemoveTextTrack(this, true);
    mediaElement->UpdateReadyState();
  }
}

TextTrackList* TextTrack::GetTextTrackList() { return mTextTrackList; }

void TextTrack::SetTextTrackList(TextTrackList* aTextTrackList) {
  mTextTrackList = aTextTrackList;
}

HTMLTrackElement* TextTrack::GetTrackElement() { return mTrackElement; }

void TextTrack::SetTrackElement(HTMLTrackElement* aTrackElement) {
  mTrackElement = aTrackElement;
}

void TextTrack::SetCuesInactive() {
  WEBVTT_LOG("SetCuesInactive");
  mCueList->SetCuesInactive();
}

void TextTrack::NotifyCueUpdated(TextTrackCue* aCue) {
  WEBVTT_LOG("NotifyCueUpdated, cue=%p", aCue);
  mCueList->NotifyCueUpdated(aCue);
  HTMLMediaElement* mediaElement = GetMediaElement();
  if (mediaElement) {
    mediaElement->NotifyCueUpdated(aCue);
  }
}

void TextTrack::GetLabel(nsAString& aLabel) const {
  if (mTrackElement) {
    mTrackElement->GetLabel(aLabel);
  } else {
    aLabel = mLabel;
  }
}
void TextTrack::GetLanguage(nsAString& aLanguage) const {
  if (mTrackElement) {
    mTrackElement->GetSrclang(aLanguage);
  } else {
    aLanguage = mLanguage;
  }
}

void TextTrack::DispatchAsyncTrustedEvent(const nsString& aEventName) {
  nsPIDOMWindowInner* win = GetOwner();
  if (!win) {
    return;
  }
  RefPtr<TextTrack> self = this;
  nsGlobalWindowInner::Cast(win)->Dispatch(NS_NewRunnableFunction(
      "dom::TextTrack::DispatchAsyncTrustedEvent",
      [self, aEventName]() { self->DispatchTrustedEvent(aEventName); }));
}

bool TextTrack::IsLoaded() {
  if (mMode == TextTrackMode::Disabled) {
    return true;
  }
  // If the TrackElement's src is null, we can not block the
  // MediaElement.
  if (mTrackElement) {
    nsAutoString src;
    if (!(mTrackElement->GetAttr(nsGkAtoms::src, src))) {
      return true;
    }
  }
  return mReadyState >= TextTrackReadyState::Loaded;
}

void TextTrack::NotifyCueActiveStateChanged(TextTrackCue* aCue) {
  MOZ_ASSERT(aCue);
  if (aCue->GetActive()) {
    MOZ_ASSERT(!mActiveCueList->IsCueExist(aCue));
    WEBVTT_LOG("NotifyCueActiveStateChanged, add cue %p to the active list",
               aCue);
    mActiveCueList->AddCue(*aCue);
  } else {
    MOZ_ASSERT(mActiveCueList->IsCueExist(aCue));
    WEBVTT_LOG(
        "NotifyCueActiveStateChanged, remove cue %p from the active list",
        aCue);
    mActiveCueList->RemoveCue(*aCue);
  }
}

void TextTrack::GetCurrentCuesAndOtherCues(
    RefPtr<TextTrackCueList>& aCurrentCues,
    RefPtr<TextTrackCueList>& aOtherCues,
    const media::TimeInterval& aInterval) const {
  const HTMLMediaElement* mediaElement = GetMediaElement();
  if (!mediaElement) {
    return;
  }

  if (Mode() == TextTrackMode::Disabled) {
    return;
  }

  // According to `time marches on` step1, current cue list contains the cues
  // whose start times are less than or equal to the current playback position
  // and whose end times are greater than the current playback position.
  // https://html.spec.whatwg.org/multipage/media.html#time-marches-on
  MOZ_ASSERT(aCurrentCues && aOtherCues);
  const double playbackTime = mediaElement->CurrentTime();
  for (uint32_t idx = 0; idx < mCueList->Length(); idx++) {
    TextTrackCue* cue = (*mCueList)[idx];
    WEBVTT_LOG("cue %p [%f:%f], playbackTime=%f", cue, cue->StartTime(),
               cue->EndTime(), playbackTime);
    if (cue->StartTime() <= playbackTime && cue->EndTime() > playbackTime) {
      WEBVTT_LOG("Add cue %p [%f:%f] to current cue list", cue,
                 cue->StartTime(), cue->EndTime());
      aCurrentCues->AddCue(*cue);
    } else {
      // As the spec didn't have a restriction for the negative duration, it
      // does happen sometime if user sets it explictly. It would be treated as
      // a `missing cue` later in the `TimeMarchesOn` but it won't be displayed.
      if (cue->EndTime() < cue->StartTime()) {
        // Add cue into `otherCue` only when its start time is contained by the
        // current time interval.
        if (aInterval.Contains(
                media::TimeUnit::FromSeconds(cue->StartTime()))) {
          WEBVTT_LOG("[Negative duration] Add cue %p [%f:%f] to other cue list",
                     cue, cue->StartTime(), cue->EndTime());
          aOtherCues->AddCue(*cue);
        }
        continue;
      }
      media::TimeInterval cueInterval(
          media::TimeUnit::FromSeconds(cue->StartTime()),
          media::TimeUnit::FromSeconds(cue->EndTime()));
      // cues are completely outside the time interval.
      if (!aInterval.Touches(cueInterval)) {
        continue;
      }
      // contains any cues which are overlapping within the time interval.
      WEBVTT_LOG("Add cue %p [%f:%f] to other cue list", cue, cue->StartTime(),
                 cue->EndTime());
      aOtherCues->AddCue(*cue);
    }
  }
}

HTMLMediaElement* TextTrack::GetMediaElement() const {
  return mTextTrackList ? mTextTrackList->GetMediaElement() : nullptr;
}

}  // namespace mozilla::dom