Add PPAPI decryptor interfaces.

ppapi/api/dev/ppp_content_decryptor_dev.idl

+/* 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.
+ */
+
+/**
+ * This file defines the <code>PPP_ContentDecryptor_Dev</code>
+ * interface.
+ */
+label Chrome {
+  M23 = 0.1
+};
+
+/**
+ * <code>PPP_ContentDecryptor_Dev</code> structure contains the function
+ * pointers the decryption plugin MUST implement to provide services needed by
+ * the media stack. This interface provides the plugin side support for v0.1 of
+ * the proposed Encrypted Media Extensions: http://goo.gl/rbdnR
+ */
+interface PPP_ContentDecryptor_Dev {
+  /**
+   * Generates a key request. key_system specifies the key or licensing system
+   * from which to request the key when the plugin provides access to multiple
+   * systems. init_data is a data buffer containing initialization data from
+   * the media data that is required for use of the plugin's key system(s).
+   * Note: <code>GenerateKeyRequest</code> is responsible for creating the
+   * session ID.
+   *
+   * @param[in] key_system A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the name of the key system.
+   *
+   * @param[in] init_data A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_ARRAYBUFFER</code> containing content specific
+   * initialization data.
+   */
+  PP_Bool GenerateKeyRequest(
+      [in] PP_Instance instance,
+      [in] PP_Var key_system,
+      [in] PP_Var init_data);
+
+  /**
+   * Provides a key or license to use for decrypting media data for session_id.
+   *
+   * @param[in] session_id A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the session ID.
+   *
+   * @param[in] key A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_ARRAYBUFFER</code> containing the decryption key for the
+   * given session ID.
+   */
+  PP_Bool AddKey(
+      [in] PP_Instance instance,
+      [in] PP_Var session_id,
+      [in] PP_Var key);
+
+  /**
+   * Cancels a pending key request for session_id.
+   *
+   * @param[in] session_id A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the session ID.
+   */
+  PP_Bool CancelKeyRequest(
+      [in] PP_Instance instance,
+      [in] PP_Var session_id);
+
+  /**
+   * Decrypts the block and returns the unencrypted block via
+   * <code>DeliverBlock</code> on the <code>PPB_ContentDecryptor_Dev</code>
+   * interface. In the case of media, the block contains encoded data.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_Buffer_Dev</code> resource that contains an encrypted data
+   * block.
+   *
+   * @param[in] request_id A value used in <code>ppapi::PluginInstance</code> to
+   * match returned decrypted data to a callback sent from the media stack.
+   */
+  PP_Bool Decrypt(
+      [in] PP_Instance instance,
+      [in] PP_Resource encrypted_block,
+      [in] uint64_t request_id);
+
+  /**
+   * Decrypts the block then decodes it and returns the unencrypted raw
+   * (decoded) frame.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_Buffer_Dev</code> resource that contains an encrypted data
+   * block.
+   *
+   * @param[in] request_id A value used in <code>ppapi::PluginInstance</code> to
+   * match returned decrypted data to a callback sent from the media stack.
+   */
+  PP_Bool DecryptAndDecode(
+      [in] PP_Instance instance,
+      [in] PP_Resource encrypted_block,
+      [in] uint64_t request_id);
+};