/* 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_Private</code>
 * interface. Note: This is a special interface, only to be used for Content
 * Decryption Modules, not normal plugins.
 */

[generate_thunk]

label Chrome {
  M36 = 0.12
};

/**
 * <code>PPB_ContentDecryptor_Private</code> structure contains the function
 * pointers the browser must implement to support plugins implementing the
 * <code>PPP_ContentDecryptor_Private</code> interface. This interface provides
 * browser side support for the Content Decryption Module (CDM) for Encrypted
 * Media Extensions: http://www.w3.org/TR/encrypted-media/
 */
interface PPB_ContentDecryptor_Private {
  /**
   * A promise has been resolved by the CDM.
   *
   * @param[in] promise_id Identifies the promise that the CDM resolved.
   */
  void PromiseResolved(
      [in] PP_Instance instance,
      [in] uint32_t promise_id);

  /**
   * A promise that resulted in a new session has been resolved by the CDM.
   *
   * @param[in] promise_id Identifies the promise that the CDM resolved.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the session's ID attribute.
   */
  void PromiseResolvedWithSession(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var web_session_id);

  /**
   * A promise that returns a set of key IDs has been resolved by the CDM.
   *
   * @param[in] promise_id Identifies the promise that the CDM resolved.
   *
   * @param[in] key_ids A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_ARRAY</code> containing elements of type
   * <code>PP_VARTYPE_ARRAYBUFFER</code> that are the session's usable key IDs.
   */
  void PromiseResolvedWithKeyIds(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_Var key_ids_array);

  /**
   * A promise has been rejected by the CDM due to an error.
   *
   * @param[in] promise_id Identifies the promise that the CDM rejected.
   *
   * @param[in] exception_code A <code>PP_CdmExceptionCode</code> containing
   * the exception code.
   *
   * @param[in] system_code A system error code.
   *
   * @param[in] error_description A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the error description.
   */
  void PromiseRejected(
      [in] PP_Instance instance,
      [in] uint32_t promise_id,
      [in] PP_CdmExceptionCode exception_code,
      [in] uint32_t system_code,
      [in] PP_Var error_description);

  /**
   * A message or request has been generated for key_system in the CDM, and
   * must be sent to the web application.
   *
   * For example, when the browser invokes <code>CreateSession()</code>
   * on the <code>PPP_ContentDecryptor_Private</code> interface, the plugin
   * must send a message containing the license request.
   *
   * Note that <code>SessionMessage()</code> can be used for purposes other than
   * responses to <code>CreateSession()</code> calls. See also the text
   * in the comment for <code>SessionReady()</code>, which describes a sequence
   * of <code>UpdateSession()</code> and <code>SessionMessage()</code> calls
   * required to prepare for decryption.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the ID of a session for
   * which this message is intended.
   *
   * @param[in] message A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_ARRAY_BUFFER</code> that contains the message.
   *
   * @param[in] destination_url A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the destination URL for the
   * message.
   */
  void SessionMessage(
      [in] PP_Instance instance,
      [in] PP_Var web_session_id,
      [in] PP_Var message,
      [in] PP_Var destination_url);

  /**
   * The keys for a session have changed.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the ID of the session that has
   * a change in keys.
   *
   * @param[in] has_additional_usable_key A <code>PP_Bool</code> indicating if
   * a new usable key has been added.
   */
  void SessionKeysChange(
      [in] PP_Instance instance,
      [in] PP_Var web_session_id,
      [in] PP_Bool has_additional_usable_key);

  /**
   * The expiration time for a session has changed.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the ID of the session that has
   * a new expiration time.
   *
   * @param[in] new_expiry_time A <code>PP_Time</code> indicating the new
   * expiry time of the session. The value is defined as the number of seconds
   * since the Epoch (00:00:00 UTC, January 1, 1970).
   */
  void SessionExpirationChange(
      [in] PP_Instance instance,
      [in] PP_Var web_session_id,
      [in] PP_Time new_expiry_time);

  /**
   * The session is now ready to decrypt the media stream.
   *
   * Note: The above describes the most simple case. Depending on the key
   * system, a series of <code>SessionMessage()</code> calls from the CDM will
   * be sent to the browser, and then on to the web application. The web
   * application must then provide more data to the CDM by directing the browser
   * to pass the data to the CDM via calls to <code>UpdateSession()</code> on
   * the <code>PPP_ContentDecryptor_Private</code> interface.
   * The CDM must call <code>SessionReady()</code> when the sequence is
   * completed, and, in response, the browser must notify the web application.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the session's ID attribute of
   * the session that is now ready.
   */
  void SessionReady(
      [in] PP_Instance instance,
      [in] PP_Var web_session_id);

  /**
   * The session has been closed as the result of a call to the
   * <code>ReleaseSession()</code> method on the
   * <code>PPP_ContentDecryptor_Private</code> interface, or due to other
   * factors as determined by the CDM.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the session's ID attribute of
   * the session that is now closed.
   */
  void SessionClosed(
      [in] PP_Instance instance,
      [in] PP_Var web_session_id);

  /**
   * An error occurred in a <code>PPP_ContentDecryptor_Private</code> method,
   * or within the plugin implementing the interface.
   *
   * @param[in] web_session_id A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the session's ID attribute of
   * the session that caused the error.
   *
   * @param[in] exception_code A <code>PP_CdmExceptionCode</code> containing
   * the exception code.
   *
   * @param[in] system_code A system error code.
   *
   * @param[in] error_description A <code>PP_Var</code> of type
   * <code>PP_VARTYPE_STRING</code> containing the error description.
   */
  void SessionError(
      [in] PP_Instance instance,
      [in] PP_Var web_session_id,
      [in] PP_CdmExceptionCode exception_code,
      [in] uint32_t system_code,
      [in] PP_Var error_description);

  /**
   * Called after the <code>Decrypt()</code> method on the
   * <code>PPP_ContentDecryptor_Private</code> interface completes to
   * deliver decrypted_block to the browser for decoding and rendering.
   *
   * The plugin must not hold a reference to the encrypted buffer resource
   * provided to <code>Decrypt()</code> when it calls this method. The browser
   * will reuse the buffer in a subsequent <code>Decrypt()</code> call.
   *
   * @param[in] decrypted_block A <code>PP_Resource</code> corresponding to a
   * <code>PPB_Buffer_Dev</code> resource that contains a decrypted data
   * block.
   *
   * @param[in] decrypted_block_info A <code>PP_DecryptedBlockInfo</code> that
   * contains the result code and tracking info associated with the
   * <code>decrypted_block</code>.
   */
  void DeliverBlock(
      [in] PP_Instance instance,
      [in] PP_Resource decrypted_block,
      [in] PP_DecryptedBlockInfo decrypted_block_info);

  /**
   * Called after the <code>InitializeAudioDecoder()</code> or
   * <code>InitializeVideoDecoder()</code> method on the
   * <code>PPP_ContentDecryptor_Private</code> interface completes to report
   * decoder initialization status to the browser.
   *
   * @param[in] success A <code>PP_Bool</code> that is set to
   * <code>PP_TRUE</code> when the decoder initialization request associated
   * with <code>request_id</code> was successful.
   *
   * @param[in] decoder_type A <code>PP_DecryptorStreamType</code> identifying
   * the decoder type for which this initialization status response was sent.
   *
   * @param[in] request_id The <code>request_id</code> value passed to
   * <code>InitializeAudioDecoder</code> or <code>InitializeVideoDecoder</code>
   * in <code>PP_AudioDecoderConfig</code> or
   * <code>PP_VideoDecoderConfig</code>.
   */
  void DecoderInitializeDone(
      [in] PP_Instance instance,
      [in] PP_DecryptorStreamType decoder_type,
      [in] uint32_t request_id,
      [in] PP_Bool success);

  /**
   * Called after the <code>DeinitializeDecoder()</code> method on the
   * <code>PPP_ContentDecryptor_Private</code> interface completes to report
   * decoder de-initialization completion to the browser.
   *
   * @param[in] decoder_type The <code>PP_DecryptorStreamType</code> passed to
   * <code>DeinitializeDecoder()</code>.
   *
   * @param[in] request_id The <code>request_id</code> value passed to
   * <code>DeinitializeDecoder()</code>.
   */
  void DecoderDeinitializeDone(
      [in] PP_Instance instance,
      [in] PP_DecryptorStreamType decoder_type,
      [in] uint32_t request_id);

  /**
   * Called after the <code>ResetDecoder()</code> method on the
   * <code>PPP_ContentDecryptor_Private</code> interface completes to report
   * decoder reset completion to the browser.
   *
   * @param[in] decoder_type The <code>PP_DecryptorStreamType</code> passed to
   * <code>ResetDecoder()</code>.
   *
   * @param[in] request_id The <code>request_id</code> value passed to
   * <code>ResetDecoder()</code>.
   */
  void DecoderResetDone(
      [in] PP_Instance instance,
      [in] PP_DecryptorStreamType decoder_type,
      [in] uint32_t request_id);

  /**
   * Called after the <code>DecryptAndDecode()</code> method on the
   * <code>PPP_ContentDecryptor_Private</code> interface completes to deliver
   * a decrypted and decoded video frame to the browser for rendering.
   *
   * The plugin must not hold a reference to the encrypted buffer resource
   * provided to <code>DecryptAndDecode()</code> when it calls this method. The
   * browser will reuse the buffer in a subsequent
   * <code>DecryptAndDecode()</code> call.
   *
   * @param[in] decrypted_frame A <code>PP_Resource</code> corresponding to a
   * <code>PPB_Buffer_Dev</code> resource that contains a video frame.
   *
   * @param[in] decrypted_frame_info A <code>PP_DecryptedFrameInfo</code> that
   * contains the result code, tracking info, and buffer format associated with
   * <code>decrypted_frame</code>.
   */
  void DeliverFrame(
      [in] PP_Instance instance,
      [in] PP_Resource decrypted_frame,
      [in] PP_DecryptedFrameInfo decrypted_frame_info);

  /**
   * Called after the <code>DecryptAndDecode()</code> method on the
   * <code>PPP_ContentDecryptor_Private</code> interface completes to deliver
   * a buffer of decrypted and decoded audio samples to the browser for
   * rendering.
   *
   * The plugin must not hold a reference to the encrypted buffer resource
   * provided to <code>DecryptAndDecode()</code> when it calls this method. The
   * browser will reuse the buffer in a subsequent
   * <code>DecryptAndDecode()</code> call.
   *
   * <code>audio_frames</code> can contain multiple audio output buffers. Each
   * buffer is serialized in this format:
   *
   * |<------------------- serialized audio buffer ------------------->|
   * | int64_t timestamp | int64_t length | length bytes of audio data |
   *
   * For example, with three audio output buffers, |audio_frames| will look
   * like this:
   *
   * |<---------------- audio_frames ------------------>|
   * | audio buffer 0 | audio buffer 1 | audio buffer 2 |
   *
   * @param[in] audio_frames A <code>PP_Resource</code> corresponding to a
   * <code>PPB_Buffer_Dev</code> resource that contains a decrypted buffer
   * of decoded audio samples.
   *
   * @param[in] decrypted_sample_info A <code>PP_DecryptedSampleInfo</code> that
   * contains the tracking info and result code associated with the decrypted
   * samples.
   */
  void DeliverSamples(
      [in] PP_Instance instance,
      [in] PP_Resource audio_frames,
      [in] PP_DecryptedSampleInfo decrypted_sample_info);
};
