Add PPAPI decryptor interfaces.

ppapi/api/dev/ppb_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>PPB_ContentDecryptor_Dev</code>

[dmichael (off chromium), 2012/08/08 22:24:02]

I talked to Brett about it, and we agreed that this stuff should go straight in
to private (instead of dev). (Sorry.)

[Tom Finegan, 2012/08/09 22:45:17]

Done.

+ * interface.
+ */
+label Chrome {
+  M23 = 0.1
+};
+
+/**
+ * <code>PPB_ContentDecryptor_Dev</code> structure contains the function
+ * pointers the browser MUST implement to support plugins implementing the
+ * <code>PPP_ContentDecryptor_Dev</code> interface. This interface provides
+ * browser side support for v0.1 of the proposed Encrypted Media Extensions:
+ * http://goo.gl/rbdnR

[dmichael (off chromium), 2012/08/08 22:24:02]

Also please note that this is a special interface, only to be used for Content
Decryption Modules, not normal plugins.

[Tom Finegan, 2012/08/09 22:45:17]

Done.

+ */
+interface PPB_ContentDecryptor_Dev {
+
+  /**
+   * The decryptor requires a key that has not been provided.
+   *
+   * Sent when the decryptor encounters encrypted content, but it does not have
+   * the key required to decrypt the data. The plugin will call this method in
+   * response to a call to a decrypt method on the
+   * <code>PPP_ContentDecryptor_Dev<code> interface, In response, the browser
+   * must provide a key to the decryptor by calling <code>AddKey()</code> on

[dmichael (off chromium), 2012/08/08 22:24:02]

How does it do that? The way I was reading the spec, the app might need to talk
to a server to get the key. So I don't think we can promise that the browser
will call AddKey if it's the app's responsibility.

[Tom Finegan, 2012/08/09 22:45:17]

Changed browser to application.

+   * the <code>PPP_ContentDecryptor_Dev<code> interface.
+   *
+   * @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] session_id A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the session ID.
+   *
+   * @param[in] init_data A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_ARRAYBUFFER</code> containing content specific
+   * initialization data.
+   */
+  void NeedKey(
+      [in] PP_Instance instance,
+      [in] PP_Var key_system,
+      [in] PP_Var session_id,
+      [in] PP_Var init_data);
+
+  /**
+   * A key has been added as the result of a call to the <code>AddKey()</code>
+   * method on the <code>PPP_ContentDecryptor_Dev</code> interface, and
+   * decryption of content can proceed.
+   *
+   * @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] session_id A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the session ID.
+   */
+  void KeyAdded(
+      [in] PP_Instance instance,
+      [in] PP_Var key_system,
+      [in] PP_Var session_id);
+
+  /**
+   * A message or request has been generated by or for key_system, and needs to
+   * be sent to a key server.
+   *
+   * For example, in response to successful key request generation resulting
+   * from a call to the <code>GenerateKeyRequest()</code> method on the
+   * <code>PPP_ContentDecryptor_Dev</code> interface, the decryptor will send
+   * a key message with the session ID.
+   *
+   * Note that <code>KeyMessage()</code> can be used for purposes other than
+   * responses to <code>GenerateKeyRequest()</code> calls.
+   *
+   * @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] session_id A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the session ID.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_Buffer_Dev</code> resource that contains the message.
+   *
+   * @param[in] session_id A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the default URL for key system.
+   */
+  void KeyMessage(
+      [in] PP_Instance instance,
+      [in] PP_Var key_system,
+      [in] PP_Var session_id,
+      [in] PP_Resource message,
+      [in] PP_Var default_url);
+
+  /**
+   * An error occurred in a <code>PPP_ContentDecryptor_Dev</code> method,
+   * or within the plugin implementing the interface, and decryption cannot
+   * continue.
+   *
+   * @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] session_id A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the session ID.
+   *
+   * @param[in] media_error A media stack error code.
+   *
+   * @param[in] system_error A system error code.
+   */
+  void KeyError(
+      [in] PP_Instance instance,
+      [in] PP_Var key_system,
+      [in] PP_Var session_id,
+      [in] int32_t media_error,
+      [in] int32_t system_error);
+
+  /**
+   * Called after the <code>Decrypt</code> method on the
+   * <code>PPP_ContentDecryptor_Dev</code> interface completes to
+   * deliver decrypted_block to the browser.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_Buffer_Dev</code> resource that contains a decrypted data
+   * block.
+   *
+   * @param[in] request_id A unique value the user agent can use to associate
+   * decrypted_block with a decrypt call.
+   */
+  void DeliverBlock(
+      [in] PP_Instance instance,
+      [in] PP_Resource decrypted_block,
+      [in] uint64_t request_id);
+
+  /**
+   * Called after the <code>DecryptAndDecode</code> method on the
+   * <code>PPP_ContentDecryptor_Dev</code> interface completes to
+   * deliver decrypted_frame to the browser.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_Buffer_Dev</code> resource that contains a decrypted video
+   * frame.
+   *
+   * @param[in] request_id A unique value the user agent can use to associate
+   * decrypted_frame with a decrypt call.
+   */
+  void DeliverFrame(
+      [in] PP_Instance instance,
+      [in] PP_Resource decrypted_frame,
+      [in] uint64_t request_id);
+
+  /**
+   * Called after the <code>DecryptAndDecode</code> method on the
+   * <code>PPP_ContentDecryptor_Dev</code> interface completes to
+   * deliver decrypted_samples to the browser.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_Buffer_Dev</code> resource that contains a decrypted buffer
+   * of audio samples.
+   *
+   * @param[in] request_id A unique value the user agent can use to associate
+   * decrypted_samples with a decrypt call.
+   */
+  void DeliverSamples(
+      [in] PP_Instance instance,
+      [in] PP_Resource decrypted_samples,
+      [in] uint64_t request_id);
+};