/* 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_Private</code>
 * interface. Note: This is a special interface, only to be used for Content
 * Decryption Modules, not normal plugins.
 */
label Chrome {
  M36 = 0.12
};

/**
 * <code>PPP_ContentDecryptor_Private</code> structure contains the function
 * pointers the decryption plugin must implement to provide services needed by
 * the browser. This interface provides the plugin side support for the Content
 * Decryption Module (CDM) for Encrypted Media Extensions:
 * http://www.w3.org/TR/encrypted-media/
 */
interface PPP_ContentDecryptor_Private {
  /**
   * Initialize for the specified key system.
   *
   * @param[in] key_system A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the name of the key system.
   */
  void Initialize(
      [in] PP_Instance instance,
      [in] PP_Var key_system);

  /**
   * Provides a server certificate to be used to encrypt messages to the
   * license server.
   *
   * @param[in] promise_id A reference for the promise that gets resolved or
   * rejected depending upon the success or failure of setting the certificate.
   *
   * @param[in] server_certificate A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_ARRAYBUFFER</code> containing the certificate to be used.
   */
  void SetServerCertificate(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var server_certificate);

  /**
   * Creates a session. <code>init_data_type</code> contains the MIME type of
   * <code>init_data</code>. <code>init_data</code> is a data buffer
   * containing data for use in generating the request.
   *
   * Note: <code>CreateSession()</code> must create a web session ID and provide
   * it to the browser via <code>SessionCreated()</code> on the
   * <code>PPB_ContentDecryptor_Private</code> interface.
   *
   * @param[in] promise_id A reference for the promise that gets resolved or
   * rejected depending upon the success or failure when creating the session.
   *
   * @param[in] init_data_type A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the MIME type for init_data.
   *
   * @param[in] init_data A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_ARRAYBUFFER</code> containing container specific
   * initialization data.
   *
   * @param[in] session_type A <code>PP_SessionType</code> that indicates the
   * type of session to be created.
   */
  void CreateSession(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var init_data_type,
      [in] PP_Var init_data,
      [in] PP_SessionType session_type);

  /**
   * Loads a session whose web session ID is <code>web_session_id</code>.
   *
   * Note: After the session is successfully loaded, the CDM must call
   * <code>SessionCreated()</code> with <code>web_session_id</code> on the
   * <code>PPB_ContentDecryptor_Private</code> interface.
   *
   * @param[in] promise_id A reference for the promise that gets resolved or
   * rejected depending upon the success or failure of loading the session.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the web session ID of the session
   * to load.
   */
  void LoadSession(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var web_session_id);

  /**
   * Provides a license or other message to the decryptor.
   *
   * When the CDM needs more information, it must call
   * <code>SessionMessage()</code> on the
   * <code>PPB_ContentDecryptor_Private</code> interface, and the browser
   * must notify the web application. When the CDM has finished processing
   * <code>response</code> and needs no more information, it must call
   * <code>SessionReady()</code> on the
   * <code>PPB_ContentDecryptor_Private</code> interface, and the browser
   * must notify the web application.
   *
   * @param[in] promise_id A reference for the promise that gets resolved or
   * rejected depending upon the success or failure of updating the session.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the web session ID of the session
   * to be updated.
   *
   * @param[in] response A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_ARRAYBUFFER</code> containing the license or other
   * message for the given session ID.
   */
  void UpdateSession(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var web_session_id,
      [in] PP_Var response);

  /**
   * Close the specified session and related resources.
   *
   * @param[in] promise_id A reference for the promise that gets resolved or
   * rejected depending upon the success or failure of closing the session.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the web session ID of the session
   * to be closed.
   *
   */
  void CloseSession(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var web_session_id);

  /**
   * Remove stored data associated with this session.
   *
   * @param[in] promise_id A reference for the promise that gets resolved or
   * rejected depending upon the success or failure of removing the session
   * data.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the web session ID of the session
   * to be removed.
   *
   */
  void RemoveSession(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var web_session_id);

  /**
   * Get the key IDs for keys in the session that the CDM knows are currently
   * usable to decrypt media data.
   *
   * @param[in] promise_id A reference for the promise that gets resolved or
   * rejected depending upon the success or failure of obtaining the key IDs.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the web session ID of the session
   * to be queried.
   *
   */
  void GetUsableKeyIds(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var web_session_id);

  /**
   * Decrypts the block and returns the unencrypted block via
   * <code>DeliverBlock()</code> on the
   * <code>PPB_ContentDecryptor_Private</code> interface. The returned 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] encrypted_block_info A <code>PP_EncryptedBlockInfo</code> that
   * contains all auxiliary information needed for decryption of the
   * <code>encrypted_block</code>.
   */
  void Decrypt(
      [in] PP_Instance instance,
      [in] PP_Resource encrypted_block,
      [in] PP_EncryptedBlockInfo encrypted_block_info);

 /**
  * Initializes the audio decoder using codec and settings in
  * <code>decoder_config</code>, and returns the result of the initialization
  * request to the browser using the <code>DecoderInitializeDone()</code> method
  * on the <code>PPB_ContentDecryptor_Private</code> interface.
  *
  * @param[in] decoder_config A <code>PP_AudioDecoderConfig</code> that
  * contains audio decoder settings and a request ID. The request ID is passed
  * to the <code>DecoderInitializeDone()</code> method on the
  * <code>PPB_ContentDecryptor_Private</code> interface to allow clients to
  * associate the result with a audio decoder initialization request.
  *
  * @param[in] codec_extra_data A <code>PP_Resource</code> corresponding to a
  * <code>PPB_Buffer_Dev</code> resource containing codec setup data required
  * by some codecs. It should be set to 0 when the codec being initialized
  * does not require it.
  */
  void InitializeAudioDecoder(
      [in] PP_Instance instance,
      [in] PP_AudioDecoderConfig decoder_config,
      [in] PP_Resource codec_extra_data);

 /**
  * Initializes the video decoder using codec and settings in
  * <code>decoder_config</code>, and returns the result of the initialization
  * request to the browser using the <code>DecoderInitializeDone()</code>
  * method on the <code>PPB_ContentDecryptor_Private</code> interface.
  *
  * @param[in] decoder_config A <code>PP_VideoDecoderConfig</code> that
  * contains video decoder settings and a request ID. The request ID is passed
  * to the <code>DecoderInitializeDone()</code> method on the
  * <code>PPB_ContentDecryptor_Private</code> interface to allow clients to
  * associate the result with a video decoder initialization request.
  *
  * @param[in] codec_extra_data A <code>PP_Resource</code> corresponding to a
  * <code>PPB_Buffer_Dev</code> resource containing codec setup data required
  * by some codecs. It should be set to 0 when the codec being initialized
  * does not require it.
  */
  void InitializeVideoDecoder(
      [in] PP_Instance instance,
      [in] PP_VideoDecoderConfig decoder_config,
      [in] PP_Resource codec_extra_data);

  /**
   * De-initializes the decoder for the <code>PP_DecryptorStreamType</code>
   * specified by <code>decoder_type</code> and sets it to an uninitialized
   * state. The decoder can be re-initialized after de-initialization completes
   * by calling <code>InitializeAudioDecoder</code> or
   * <code>InitializeVideoDecoder</code>.
   *
   * De-initialization completion is reported to the browser using the
   * <code>DecoderDeinitializeDone()</code> method on the
   * <code>PPB_ContentDecryptor_Private</code> interface.
   *
   * @param[in] decoder_type A <code>PP_DecryptorStreamType</code> that
   * specifies the decoder to de-initialize.
   *
   * @param[in] request_id A request ID that allows the browser to associate a
   * request to de-initialize a decoder with the corresponding call to the
   * <code>DecoderDeinitializeDone()</code> method on the
   * <code>PPB_ContentDecryptor_Private</code> interface.
   */
  void DeinitializeDecoder(
      [in] PP_Instance instance,
      [in] PP_DecryptorStreamType decoder_type,
      [in] uint32_t request_id);

  /**
   * Resets the decoder for the <code>PP_DecryptorStreamType</code> specified
   * by <code>decoder_type</code> to an initialized clean state. Reset
   * completion is reported to the browser using the
   * <code>DecoderResetDone()</code> method on the
   * <code>PPB_ContentDecryptor_Private</code> interface. This method can be
   * used to signal a discontinuity in the encoded data stream, and is safe to
   * call multiple times.
   *
   * @param[in] decoder_type A <code>PP_DecryptorStreamType</code> that
   * specifies the decoder to reset.
   *
   * @param[in] request_id A request ID that allows the browser to associate a
   * request to reset the decoder with a corresponding call to the
   * <code>DecoderResetDone()</code> method on the
   * <code>PPB_ContentDecryptor_Private</code> interface.
   */
  void ResetDecoder(
      [in] PP_Instance instance,
      [in] PP_DecryptorStreamType decoder_type,
      [in] uint32_t request_id);

  /**
   * Decrypts encrypted_buffer, decodes it, and returns the unencrypted
   * uncompressed (decoded) data to the browser via the
   * <code>DeliverFrame()</code> or <code>DeliverSamples()</code> method on the
   * <code>PPB_ContentDecryptor_Private</code> interface.
   *
   * @param[in] decoder_type A <code>PP_DecryptorStreamType</code> that
   * specifies the decoder to use after <code>encrypted_buffer</code> is
   * decrypted.
   *
   * @param[in] encrypted_buffer A <code>PP_Resource</code> corresponding to a
   * <code>PPB_Buffer_Dev</code> resource that contains encrypted media data.
   *
   * @param[in] encrypted_block_info A <code>PP_EncryptedBlockInfo</code> that
   * contains all auxiliary information needed for decryption of the
   * <code>encrypted_block</code>.
   */
  void DecryptAndDecode(
      [in] PP_Instance instance,
      [in] PP_DecryptorStreamType decoder_type,
      [in] PP_Resource encrypted_buffer,
      [in] PP_EncryptedBlockInfo encrypted_block_info);
};
