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
|
/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/modules/mediasource/url_media_source.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/core/html/media/media_source_attachment.h"
#include "third_party/blink/renderer/core/url/dom_url.h"
#include "third_party/blink/renderer/modules/mediasource/attachment_creation_pass_key_provider.h"
#include "third_party/blink/renderer/modules/mediasource/cross_thread_media_source_attachment.h"
#include "third_party/blink/renderer/modules/mediasource/media_source.h"
#include "third_party/blink/renderer/modules/mediasource/media_source_registry_impl.h"
#include "third_party/blink/renderer/modules/mediasource/same_thread_media_source_attachment.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
namespace blink {
// static
String URLMediaSource::createObjectURL(ScriptState* script_state,
MediaSource* source) {
// Since WebWorkers previously could not obtain MediaSource objects, we should
// be on the main thread unless MediaSourceInWorkers is enabled and we're in a
// dedicated worker execution context. Even in that case, we must prevent real
// object URL creation+registration here if MediaSourceInWorkersUsingHandle is
// enabled, since in that case, MediaSourceHandle is the exclusive attachment
// mechanism for a worker-owned MediaSource.
ExecutionContext* execution_context = ExecutionContext::From(script_state);
DCHECK(execution_context);
DCHECK(source);
UseCounter::Count(execution_context, WebFeature::kCreateObjectURLMediaSource);
MediaSourceAttachment* attachment;
if (execution_context->IsDedicatedWorkerGlobalScope()) {
DCHECK(!IsMainThread());
UseCounter::Count(execution_context,
WebFeature::kCreateObjectURLMediaSourceFromWorker);
// Return empty string, which if attempted to be used as media element src
// by the app will cause the required failure. Note that the partial
// interface for this method in WebIDL must have same exposure as the
// extended createObjectURL interface, so we cannot simply remove this.
return String();
}
// Other contexts outside of main window thread or conditionally a dedicated
// worker thread are not supported (like Shared Worker and Service Worker).
DCHECK(IsMainThread() && execution_context->IsWindow());
// PassKey provider usage here ensures that we are allowed to call the
// attachment constructor.
attachment = new SameThreadMediaSourceAttachment(
source, AttachmentCreationPassKeyProvider::GetPassKey());
// The creation of a ThreadSafeRefCounted attachment object, above, should
// have a refcount of 1 immediately. It will be adopted into a scoped_refptr
// in MediaSourceRegistryImpl::RegisterURL. See also MediaSourceAttachment
// (and usage in HTMLMediaElement, MediaSourceRegistry{Impl}, and MediaSource)
// for further detail.
DCHECK(attachment->HasOneRef());
String url = DOMURL::CreatePublicURL(execution_context, attachment);
// If attachment's registration failed, release its start-at-one reference to
// let it be destructed.
if (url.empty())
attachment->Release();
return url;
}
} // namespace blink
|
