media: Support creation and SetCdm() for mojo based CDM.

media/mojo/services/mojo_cdm.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/mojo/services/mojo_cdm.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "media/base/cdm_promise.h"
 #include "mojo/public/cpp/application/connect.h"
@@ skipping 13 matching lines @@
 }
 
 template <typename PromiseType>
 static void RejectPromise(scoped_ptr<PromiseType> promise,
                           mojo::CdmPromiseResultPtr result) {
   promise->reject(static_cast<MediaKeys::Exception>(result->exception),
                   result->system_code, result->error_message);
 }
 
 MojoCdm::MojoCdm(mojo::ContentDecryptionModulePtr remote_cdm,
+                 int32_t cdm_id,
                  const SessionMessageCB& session_message_cb,
                  const SessionClosedCB& session_closed_cb,
                  const SessionErrorCB& session_error_cb,
                  const SessionKeysChangeCB& session_keys_change_cb,
                  const SessionExpirationUpdateCB& session_expiration_update_cb)
     : remote_cdm_(remote_cdm.Pass()),
+      cdm_id_(cdm_id),
       session_message_cb_(session_message_cb),
       session_closed_cb_(session_closed_cb),
       session_error_cb_(session_error_cb),
       session_keys_change_cb_(session_keys_change_cb),
       session_expiration_update_cb_(session_expiration_update_cb),
       weak_factory_(this) {
   DVLOG(1) << __FUNCTION__;
+  DCHECK_NE(CdmContext::kInvalidCdmId, cdm_id_);

[ddorwin, 2015/01/06 00:57:28]

Will this change if/when Mojo supports GetDecryptor()?

[xhwang, 2015/01/06 19:54:54]

For simplicity, I am assigning a valid CDM ID to all MojoCdm instances, not
matter whether the Decryptor interface is supported or not. The media::Renderer
implementation (RendererImpl or MojoRendererImpl) will decide whether it wants
to use a Decryptor interface directly, or use a cdm_id for its remote renderer
service.

[ddorwin, 2015/01/07 00:37:13]

Acknowledged. Thanks.

   DCHECK(!session_message_cb_.is_null());
   DCHECK(!session_closed_cb_.is_null());
   DCHECK(!session_error_cb_.is_null());
   DCHECK(!session_keys_change_cb_.is_null());
   DCHECK(!session_expiration_update_cb_.is_null());
 
   remote_cdm_.set_client(this);
 }
 
 MojoCdm::~MojoCdm() {
   DVLOG(1) << __FUNCTION__;
 }
 
 void MojoCdm::SetServerCertificate(const uint8_t* certificate_data,
                                    int certificate_data_length,
                                    scoped_ptr<SimpleCdmPromise> promise) {
+  DVLOG(2) << __FUNCTION__;
   remote_cdm_->SetServerCertificate(
       CreateMojoArray(certificate_data, certificate_data_length),
       base::Bind(&MojoCdm::OnPromiseResult<>, weak_factory_.GetWeakPtr(),
                  base::Passed(&promise)));
 }
 
 void MojoCdm::CreateSession(const std::string& init_data_type,
                             const uint8_t* init_data,
                             int init_data_length,
                             SessionType session_type,
                             scoped_ptr<NewSessionCdmPromise> promise) {
+  DVLOG(2) << __FUNCTION__;
   remote_cdm_->CreateSession(
       init_data_type, CreateMojoArray(init_data, init_data_length),
       static_cast<mojo::ContentDecryptionModule::SessionType>(session_type),
       base::Bind(&MojoCdm::OnPromiseResult<std::string>,
                  weak_factory_.GetWeakPtr(), base::Passed(&promise)));
 }
 
 void MojoCdm::LoadSession(const std::string& session_id,
                           scoped_ptr<NewSessionCdmPromise> promise) {
+  DVLOG(2) << __FUNCTION__;
   remote_cdm_->LoadSession(
       session_id,
       base::Bind(&MojoCdm::OnPromiseResult<std::string>,
                  weak_factory_.GetWeakPtr(), base::Passed(&promise)));
 }
 
 void MojoCdm::UpdateSession(const std::string& session_id,
                             const uint8_t* response,
                             int response_length,
                             scoped_ptr<SimpleCdmPromise> promise) {
+  DVLOG(2) << __FUNCTION__;
   remote_cdm_->UpdateSession(
       session_id, CreateMojoArray(response, response_length),
       base::Bind(&MojoCdm::OnPromiseResult<>, weak_factory_.GetWeakPtr(),
                  base::Passed(&promise)));
 }
 
 void MojoCdm::CloseSession(const std::string& session_id,
                            scoped_ptr<SimpleCdmPromise> promise) {
+  DVLOG(2) << __FUNCTION__;
   remote_cdm_->CloseSession(session_id, base::Bind(&MojoCdm::OnPromiseResult<>,
                                                    weak_factory_.GetWeakPtr(),
                                                    base::Passed(&promise)));
 }
 
 void MojoCdm::RemoveSession(const std::string& session_id,
                             scoped_ptr<SimpleCdmPromise> promise) {
+  DVLOG(2) << __FUNCTION__;
   remote_cdm_->RemoveSession(session_id, base::Bind(&MojoCdm::OnPromiseResult<>,
                                                     weak_factory_.GetWeakPtr(),
                                                     base::Passed(&promise)));
 }
 
 CdmContext* MojoCdm::GetCdmContext() {
-  NOTIMPLEMENTED();
+  DVLOG(2) << __FUNCTION__;
+  return this;
+}
+
+media::Decryptor* MojoCdm::GetDecryptor() {
   return nullptr;

[ddorwin, 2015/01/06 00:57:28]

Should this never be called? i.e. NOTREACHED()

[xhwang, 2015/01/06 19:54:54]

Currently yes. When we start to support the desktop case where we'll use
RendererImpl + MojoCdm, this needs to be implemented. Adds NOTIMPLEMENTED()
here.

 }
 
+int MojoCdm::GetCdmId() const {
+  DVLOG(2) << __FUNCTION__ << cdm_id_;
+  return cdm_id_;
+}
+
 void MojoCdm::OnSessionMessage(const mojo::String& session_id,
                                mojo::Array<uint8_t> message,
                                const mojo::String& destination_url) {
+  DVLOG(2) << __FUNCTION__;
   GURL verified_gurl = GURL(destination_url);
   if (!verified_gurl.is_valid() && !verified_gurl.is_empty()) {
     DLOG(WARNING) << "SessionMessage destination_url is invalid : "
                   << verified_gurl.possibly_invalid_spec();
     verified_gurl = GURL::EmptyGURL();  // Replace invalid destination_url.
   }
 
   session_message_cb_.Run(session_id, message.storage(), verified_gurl);
 }
 
 void MojoCdm::OnSessionClosed(const mojo::String& session_id) {
+  DVLOG(2) << __FUNCTION__;
   session_closed_cb_.Run(session_id);
 }
 
 void MojoCdm::OnSessionError(const mojo::String& session_id,
                              mojo::CdmException exception,
                              uint32_t system_code,
                              const mojo::String& error_message) {
+  DVLOG(2) << __FUNCTION__;
   session_error_cb_.Run(session_id,
                         static_cast<MediaKeys::Exception>(exception),
                         system_code, error_message);
 }
 
 void MojoCdm::OnSessionKeysChange(const mojo::String& session_id,
                                   bool has_additional_usable_key) {
+  DVLOG(2) << __FUNCTION__;
   session_keys_change_cb_.Run(session_id, has_additional_usable_key);
 }
 
 void MojoCdm::OnSessionExpirationUpdate(const mojo::String& session_id,
                                         int64_t new_expiry_time_usec) {
+  DVLOG(2) << __FUNCTION__;
   session_expiration_update_cb_.Run(
       session_id, base::Time::FromInternalValue(new_expiry_time_usec));
 }
 
 template <typename... T>
 void MojoCdm::OnPromiseResult(scoped_ptr<CdmPromiseTemplate<T...>> promise,
                               mojo::CdmPromiseResultPtr result,
                               typename MojoTypeTrait<T>::MojoType... args) {
+  DVLOG(2) << __FUNCTION__;
   if (result->success)
     promise->resolve(args.template To<T>()...);  // See ISO C++03 14.2/4.
   else
     RejectPromise(promise.Pass(), result.Pass());
 }
 
 }  // namespace media