media/blink/webcontentdecryptionmoduleaccess_impl.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/blink/webcontentdecryptionmoduleaccess_impl.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/bind.h"
   9 #include "base/location.h"
  10 #include "base/message_loop/message_loop_proxy.h"
  11 #include "media/blink/webencryptedmediaclient_impl.h"
  12
  13 namespace media {
  14
  15 // The caller owns the created cdm (passed back using |result|).
  16 static void CreateCdm(const base::WeakPtr<WebEncryptedMediaClientImpl>& client,
  17                       const blink::WebString& key_system,
  18                       bool allow_distinctive_identifier,
  19                       bool allow_persistent_state,
  20                       const blink::WebSecurityOrigin& security_origin,
  21                       blink::WebContentDecryptionModuleResult result) {
  22   // If |client| is gone (due to the frame getting destroyed), it is
  23   // impossible to create the CDM, so fail.
  24   if (!client) {
  25     result.completeWithError(
  26         blink::WebContentDecryptionModuleExceptionInvalidStateError, 0,
  27         "Failed to create CDM.");
  28     return;
  29   }
  30
  31   client->CreateCdm(key_system, allow_distinctive_identifier,
  32                     allow_persistent_state, security_origin, result);
  33 }
  34
  35 WebContentDecryptionModuleAccessImpl*
  36 WebContentDecryptionModuleAccessImpl::Create(
  37     const blink::WebString& key_system,
  38     const blink::WebMediaKeySystemConfiguration& configuration,
  39     const blink::WebSecurityOrigin& security_origin,
  40     const base::WeakPtr<WebEncryptedMediaClientImpl>& client) {
  41   return new WebContentDecryptionModuleAccessImpl(key_system, configuration,
  42                                                   security_origin, client);
  43 }
  44
  45 WebContentDecryptionModuleAccessImpl::WebContentDecryptionModuleAccessImpl(
  46     const blink::WebString& key_system,
  47     const blink::WebMediaKeySystemConfiguration& configuration,
  48     const blink::WebSecurityOrigin& security_origin,
  49     const base::WeakPtr<WebEncryptedMediaClientImpl>& client)
  50     : key_system_(key_system),
  51       configuration_(configuration),
  52       security_origin_(security_origin),
  53       client_(client) {
  54 }
  55
  56 WebContentDecryptionModuleAccessImpl::~WebContentDecryptionModuleAccessImpl() {
  57 }
  58
  59 blink::WebMediaKeySystemConfiguration
  60 WebContentDecryptionModuleAccessImpl::getConfiguration() {
  61   return configuration_;
  62 }
  63
  64 void WebContentDecryptionModuleAccessImpl::createContentDecryptionModule(
  65     blink::WebContentDecryptionModuleResult result) {
  66   // Convert the accumulated configuration requirements to bools. Accumulated
  67   // configurations never have optional requirements.
  68   DCHECK(configuration_.distinctiveIdentifier !=
  69          blink::WebMediaKeySystemConfiguration::Requirement::Optional);
  70   DCHECK(configuration_.persistentState !=
  71          blink::WebMediaKeySystemConfiguration::Requirement::Optional);
  72   bool allow_distinctive_identifier =
  73       (configuration_.distinctiveIdentifier ==
  74        blink::WebMediaKeySystemConfiguration::Requirement::Required);
  75   bool allow_persistent_state =
  76       (configuration_.persistentState ==
  77        blink::WebMediaKeySystemConfiguration::Requirement::Required);
  78
  79   // This method needs to run asynchronously, as it may need to load the CDM.
  80   // As this object's lifetime is controlled by MediaKeySystemAccess on the
  81   // blink side, copy all values needed by CreateCdm() in case the blink object
  82   // gets garbage-collected.
  83   base::MessageLoopProxy::current()->PostTask(
  84       FROM_HERE,
  85       base::Bind(&CreateCdm, client_, key_system_, allow_distinctive_identifier,
  86                  allow_persistent_state, security_origin_, result));
  87 }
  88
  89 }  // namespace media