Add PpapiDecryptor which wraps a CDM plugin.

webkit/media/crypto/ppapi_decryptor.cc

+// Copyright (c) 2012 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 "webkit/media/crypto/ppapi_decryptor.h"
+
+#include "base/logging.h"
+#include "media/base/decoder_buffer.h"
+#include "media/base/decryptor_client.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayerClient.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+#include "webkit/media/crypto/key_systems.h"
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
+#include "webkit/plugins/ppapi/ppapi_webplugin_impl.h"
+
+namespace webkit_media {
+
+static scoped_refptr<webkit::ppapi::PluginInstance> CreatePluginInstance(
+    const std::string& plugin_type,
+    WebKit::WebMediaPlayerClient* web_media_player_client,
+    WebKit::WebFrame* web_frame) {
+  DCHECK(web_media_player_client);
+  DCHECK(web_frame);
+
+  WebKit::WebPlugin* web_plugin = web_media_player_client->createHelperPlugin(
+      WebKit::WebString::fromUTF8(plugin_type), web_frame);
+  if (!web_plugin)
+    return NULL;
+
+  DCHECK(!web_plugin->isPlaceholder());  // Prevented by WebKit.
+  // Only Pepper plugins are supported, so it must be a ppapi object.
+  webkit::ppapi::WebPluginImpl* ppapi_plugin =
+      static_cast<webkit::ppapi::WebPluginImpl*>(web_plugin);
+  return scoped_refptr<webkit::ppapi::PluginInstance>(ppapi_plugin->instance());
+}
+
+PpapiDecryptor::PpapiDecryptor(media::DecryptorClient* client)
+    : client_(client) {
+}
+
+PpapiDecryptor::~PpapiDecryptor() {
+}
+
+bool PpapiDecryptor::Init(const std::string& key_system,
+                          WebKit::WebMediaPlayerClient* web_media_player_client,
+                          WebKit::WebFrame* web_frame) {
+  const char* plugin_type = GetPluginType(key_system);
+  DCHECK(plugin_type);
+  cdm_plugin_ = CreatePluginInstance(plugin_type,
+                                     web_media_player_client, web_frame);
+  if (!cdm_plugin_) {
+    DVLOG(1) << "PpapiDecryptor: plugin instance creation failed.";
+    return false;
+  }
+
+  return true;
+}
+
+void PpapiDecryptor::GenerateKeyRequest(const std::string& key_system,
+                                        const uint8* init_data,
+                                        int init_data_length) {
+  DCHECK(cdm_plugin_);
+  // TODO(xhwang): Enable the following once we have updated PluginInstance.
+  // if (!cdm_plugin_->GenerateKeyRequest(key_system,
+  //                                      init_data, init_data_length)) {
+  //   client_->KeyError(key_system, "", media::Decryptor::kUnknownError, 0);
+  // }
+}
+
+void PpapiDecryptor::AddKey(const std::string& key_system,
+                            const uint8* key,
+                            int key_length,
+                            const uint8* init_data,
+                            int init_data_length,
+                            const std::string& session_id) {
+  DCHECK(cdm_plugin_);
+  // TODO(xhwang): Enable the following once we have updated PluginInstance.
+  // if (!cdm_plugin_->AddKey(key_system, key, key_length,
+  //                          init_data, init_data_length, session_id)) {
+  //   client_->KeyError(key_system, session_id, Decryptor::kUnknownError, 0);
+  // }
+}
+
+void PpapiDecryptor::CancelKeyRequest(const std::string& key_system,
+                                      const std::string& session_id) {
+  DCHECK(cdm_plugin_);
+  // TODO(xhwang): Enable the following once we have updated PluginInstance.
+  // if (!cdm_plugin_->CancelKeyRequest(key_system, session_id))
+  //   client_->KeyError(key_system, session_id, Decryptor::kUnknownError, 0);
+}
+
+void PpapiDecryptor::Decrypt(
+    const scoped_refptr<media::DecoderBuffer>& encrypted,
+    const DecryptCB& decrypt_cb) {
+  DCHECK(cdm_plugin_);
+  // TODO(xhwang): Enable the following once we have updated PluginInstance.
+  // TODO(xhwang): Need to figure out thread safety about PPP calls.
+  // if (!cdm_plugin_->Decrypt(
+  //     encrypted, base::Bind(&PpapiDecryptor::DataReady, this, decrypt_cb))) {
+  //   decrypt_cb.Run(kError, NULL);
+  // }
+}
+
+void PpapiDecryptor::DataReady(const DecryptCB& decrypt_cb,
+                               const uint8* data, int data_size ) {
+  DCHECK(!decrypt_cb.is_null());
+  scoped_refptr<media::DecoderBuffer> decrypted_data =
+      media::DecoderBuffer::CopyFrom(data, data_size);
+  decrypt_cb.Run(kSuccess, decrypted_data);
+}
+

[ddorwin, 2012/07/19 01:12:34]

Do we need KeyMessage, etc. here too?

[xhwang, 2012/07/19 15:54:34]

Are we going to pass those KeyMessage etc into the plugin? Can we just use
base::Bind(&DecryptorClient::KeyMessage, client_)?

[ddorwin, 2012/07/19 20:50:09]

SG, but we have to wrap that in this class, right? Or are we exposing
DecryptorClient (and the client) to the PluginInstance?

[xhwang, 2012/07/19 21:54:03]

I didn't pass it in anywhere because I don't know how to pass in yet. Added a
TODO.

+}  // namespace webkit_media