Add Promises for EME (Chromium side)

media/cdm/ppapi/cdm_wrapper.h

Index: media/cdm/ppapi/cdm_wrapper.h
diff --git a/media/cdm/ppapi/cdm_wrapper.h b/media/cdm/ppapi/cdm_wrapper.h
index cf8e88b2ad3a3e8fe44766dcdebbc67a111f5cb6..db7889a9e9bbcb49754102e57aa680285a9698fa 100644
--- a/media/cdm/ppapi/cdm_wrapper.h
+++ b/media/cdm/ppapi/cdm_wrapper.h
@@ -42,18 +42,23 @@ class CdmWrapper {
 
   virtual ~CdmWrapper() {};
 
-  virtual void CreateSession(uint32_t session_id,
-                             const char* content_type,
-                             uint32_t content_type_size,
+  virtual void CreateSession(uint32_t promise_id,
+                             const char* init_data_type,
+                             uint32_t init_data_type_size,
                              const uint8_t* init_data,
-                             uint32_t init_data_size) = 0;
-  virtual void LoadSession(uint32_t session_id,
+                             uint32_t init_data_size,
+                             cdm::SessionType session_type) = 0;
+  virtual void LoadSession(uint32_t promise_id,
                            const char* web_session_id,
                            uint32_t web_session_id_size) = 0;
-  virtual void UpdateSession(uint32_t session_id,
+  virtual void UpdateSession(uint32_t promise_id,
+                             const char* web_session_id,
+                             uint32_t web_session_id_size,
                              const uint8_t* response,
                              uint32_t response_size) = 0;
-  virtual void ReleaseSession(uint32_t session_id) = 0;
+  virtual void ReleaseSession(uint32_t promise_id,
+                              const char* web_session_id,
+                              uint32_t web_session_id_size) = 0;
   virtual void TimerExpired(void* context) = 0;
   virtual cdm::Status Decrypt(const cdm::InputBuffer& encrypted_buffer,
                               cdm::DecryptedBlock* decrypted_buffer) = 0;
@@ -75,6 +80,21 @@ class CdmWrapper {
       uint32_t link_mask,
       uint32_t output_protection_mask) = 0;
 
+  // Helper function for the cdm::Host_4 methods. Calls to CreateSession(),
+  // LoadSession(), UpdateSession(), and ReleaseSession() pass in promise ids,
+  // but the CDM interface needs session ids. For create and load, we need to
+  // create a new session_id to pass to the CDM. For update and release, we need
+  // to look up |web_session_id| and convert it into the existing |session_id|.
+  // Since the callbacks don't come through this interface, cdm_adapter needs to
+  // create the mapping (and delete it on release).
+  // TODO(jrummell): Remove these once Host_4 interface is removed.
+  virtual uint32_t LookupPromiseId(uint32_t session_id) = 0;
+  virtual void AssignWebSessionId(uint32_t session_id,
+                                  const char* web_session_id,
+                                  uint32_t web_session_id_size) = 0;
+  virtual std::string LookupWebSessionId(uint32_t session_id) = 0;
+  virtual void DropWebSessionId(std::string web_session_id) = 0;
+
  protected:
   CdmWrapper() {}
 
@@ -106,29 +126,42 @@ class CdmWrapperImpl : public CdmWrapper {
     cdm_->Destroy();
   }
 
-  virtual void CreateSession(uint32_t session_id,
-                             const char* content_type,
-                             uint32_t content_type_size,
+  virtual void CreateSession(uint32_t promise_id,
+                             const char* init_data_type,
+                             uint32_t init_data_type_size,
                              const uint8_t* init_data,
-                             uint32_t init_data_size) OVERRIDE {
-    cdm_->CreateSession(
-        session_id, content_type, content_type_size, init_data, init_data_size);
+                             uint32_t init_data_size,
+                             cdm::SessionType session_type) OVERRIDE {
+    cdm_->CreateSession(promise_id,
+                        init_data_type,
+                        init_data_type_size,
+                        init_data,
+                        init_data_size,
+                        session_type);
   }
 
-  virtual void LoadSession(uint32_t session_id,
+  virtual void LoadSession(uint32_t promise_id,
                            const char* web_session_id,
                            uint32_t web_session_id_size) OVERRIDE {
-    cdm_->LoadSession(session_id, web_session_id, web_session_id_size);
+    cdm_->LoadSession(promise_id, web_session_id, web_session_id_size);
   }
 
-  virtual void UpdateSession(uint32_t session_id,
+  virtual void UpdateSession(uint32_t promise_id,
+                             const char* web_session_id,
+                             uint32_t web_session_id_size,
                              const uint8_t* response,
                              uint32_t response_size) OVERRIDE {
-    cdm_->UpdateSession(session_id, response, response_size);
+    cdm_->UpdateSession(promise_id,
+                        web_session_id,
+                        web_session_id_size,
+                        response,
+                        response_size);
   }
 
-  virtual void ReleaseSession(uint32_t session_id) OVERRIDE {
-    cdm_->ReleaseSession(session_id);
+  virtual void ReleaseSession(uint32_t promise_id,
+                              const char* web_session_id,
+                              uint32_t web_session_id_size) OVERRIDE {
+    cdm_->ReleaseSession(promise_id, web_session_id, web_session_id_size);
   }
 
   virtual void TimerExpired(void* context) OVERRIDE {
@@ -181,22 +214,132 @@ class CdmWrapperImpl : public CdmWrapper {
     cdm_->OnQueryOutputProtectionStatus(link_mask, output_protection_mask);
   }
 
+  uint32_t CreateSessionId() {
+    return next_session_id_++;
+  }
+
+  void AddPromise(uint32_t session_id, uint32_t promise_id) {
+    PP_DCHECK(promise_to_session_id_map_.find(session_id) ==
+              promise_to_session_id_map_.end());
+    promise_to_session_id_map_.insert(std::make_pair(session_id, promise_id));
+  }
+
+  virtual uint32_t LookupPromiseId(uint32_t session_id) {
+    std::map<uint32_t, uint32_t>::iterator it =
+        promise_to_session_id_map_.find(session_id);
+    if (it == promise_to_session_id_map_.end())
+      return 0;
+    uint32_t promise_id = it->second;
+    promise_to_session_id_map_.erase(it);
+    return promise_id;
+  }
+
+  virtual void AssignWebSessionId(uint32_t session_id,
+                                  const char* web_session_id,
+                                  uint32_t web_session_id_size) {
+    web_session_to_session_id_map_.insert(std::make_pair(
+        std::string(web_session_id, web_session_id_size), session_id));
+  }
+
+  uint32_t LookupSessionId(std::string web_session_id) {
+    return web_session_to_session_id_map_.find(web_session_id)->second;
+  }
+
+  virtual std::string LookupWebSessionId(uint32_t session_id) {
+    std::map<std::string, uint32_t>::iterator it;
+    for (it = web_session_to_session_id_map_.begin();
+         it != web_session_to_session_id_map_.end();
+         ++it) {
+      if (it->second == session_id)
+        return it->first;
+    }
+    PP_NOTREACHED();
+  }
+
+  virtual void DropWebSessionId(std::string web_session_id) {
+    web_session_to_session_id_map_.erase(web_session_id);
+  }
+
  private:
-  CdmWrapperImpl(CdmInterface* cdm) : cdm_(cdm) {
+  CdmWrapperImpl(CdmInterface* cdm) : cdm_(cdm), next_session_id_(100) {
     PP_DCHECK(cdm_);
   }
 
   CdmInterface* cdm_;
 
+  std::map<uint32_t, uint32_t> promise_to_session_id_map_;
+  uint32_t next_session_id_;
+  std::map<std::string, uint32_t> web_session_to_session_id_map_;
+
   DISALLOW_COPY_AND_ASSIGN(CdmWrapperImpl);
 };
 
+// Overrides for the cdm::Host_4 methods. Calls to CreateSession(),
+// LoadSession(), UpdateSession(), and ReleaseSession() pass in promise ids,
+// but the CDM interface needs session ids. For create and load, we need to
+// create a new session_id to pass to the CDM. For update and release, we need
+// to look up |web_session_id| and convert it into the existing |session_id|.
+// Since the callbacks don't come through this interface, cdm_adapter needs to
+// create the mapping (and delete it on release).
+// TODO(jrummell): Remove these once Host_4 interface is removed.
+
+template <>
+void CdmWrapperImpl<cdm::ContentDecryptionModule_4>::CreateSession(
+    uint32_t promise_id,
+    const char* init_data_type,
+    uint32_t init_data_type_size,
+    const uint8_t* init_data,
+    uint32_t init_data_size,
+    cdm::SessionType session_type) {
+  uint32_t session_id = CreateSessionId();
+  AddPromise(session_id, promise_id);
+  cdm_->CreateSession(session_id,
+                      init_data_type,
+                      init_data_type_size,
+                      init_data,
+                      init_data_size);
+}
+
+template <>
+void CdmWrapperImpl<cdm::ContentDecryptionModule_4>::LoadSession(
+    uint32_t promise_id,
+    const char* web_session_id,
+    uint32_t web_session_id_size) {
+  uint32_t session_id = CreateSessionId();
+  AddPromise(session_id, promise_id);
+  cdm_->LoadSession(session_id, web_session_id, web_session_id_size);
+}
+
+template <>
+void CdmWrapperImpl<cdm::ContentDecryptionModule_4>::UpdateSession(
+    uint32_t promise_id,
+    const char* web_session_id,
+    uint32_t web_session_id_size,
+    const uint8_t* response,
+    uint32_t response_size) {
+  std::string web_session_str(web_session_id, web_session_id_size);
+  uint32_t session_id = LookupSessionId(web_session_str);
+  AddPromise(session_id, promise_id);
+  cdm_->UpdateSession(session_id, response, response_size);
+}
+
+template <>
+void CdmWrapperImpl<cdm::ContentDecryptionModule_4>::ReleaseSession(
+    uint32_t promise_id,
+    const char* web_session_id,
+    uint32_t web_session_id_size) {
+  std::string web_session_str(web_session_id, web_session_id_size);
+  uint32_t session_id = LookupSessionId(web_session_str);
+  AddPromise(session_id, promise_id);
+  cdm_->ReleaseSession(session_id);
+}
+
 CdmWrapper* CdmWrapper::Create(const char* key_system,
                                uint32_t key_system_size,
                                GetCdmHostFunc get_cdm_host_func,
                                void* user_data) {
   COMPILE_ASSERT(cdm::ContentDecryptionModule::kVersion ==
-                 cdm::ContentDecryptionModule_4::kVersion,
+                     cdm::ContentDecryptionModule_5::kVersion,
                  update_code_below);
 
   // Ensure IsSupportedCdmInterfaceVersion() matches this implementation.
@@ -207,18 +350,22 @@ CdmWrapper* CdmWrapper::Create(const char* key_system,
       !IsSupportedCdmInterfaceVersion(cdm::ContentDecryptionModule::kVersion +
                                       1) &&
       IsSupportedCdmInterfaceVersion(cdm::ContentDecryptionModule::kVersion) &&
-      !IsSupportedCdmInterfaceVersion(cdm::ContentDecryptionModule::kVersion -
+      IsSupportedCdmInterfaceVersion(
+          cdm::ContentDecryptionModule_4::kVersion) &&
+      !IsSupportedCdmInterfaceVersion(cdm::ContentDecryptionModule_4::kVersion -
                                       1));
 
   // Try to create the CDM using the latest CDM interface version.
   CdmWrapper* cdm_wrapper =
       CdmWrapperImpl<cdm::ContentDecryptionModule>::Create(
           key_system, key_system_size, get_cdm_host_func, user_data);
+  if (cdm_wrapper)
+    return cdm_wrapper;
 
   // If |cdm_wrapper| is NULL, try to create the CDM using older supported
   // versions of the CDM interface.
-  // No older versions of CDM interface supported.
-
+  cdm_wrapper = CdmWrapperImpl<cdm::ContentDecryptionModule_4>::Create(
+      key_system, key_system_size, get_cdm_host_func, user_data);
   return cdm_wrapper;
 }
 
@@ -227,7 +374,7 @@ CdmWrapper* CdmWrapper::Create(const char* key_system,
 // does not have.
 // Also update supported_cdm_versions.h.
 COMPILE_ASSERT(cdm::ContentDecryptionModule::kVersion ==
-                   cdm::ContentDecryptionModule_4::kVersion,
+                   cdm::ContentDecryptionModule_5::kVersion,
                ensure_cdm_wrapper_templates_have_old_version_support);
 
 }  // namespace media