// 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 "ppapi/cpp/private/content_decryptor_private.h"

#include <cstring>  // memcpy

#include "ppapi/c/ppb_var.h"
#include "ppapi/c/private/ppb_content_decryptor_private.h"
#include "ppapi/c/private/ppp_content_decryptor_private.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/instance_handle.h"
#include "ppapi/cpp/logging.h"
#include "ppapi/cpp/module.h"
#include "ppapi/cpp/module_impl.h"
#include "ppapi/cpp/var.h"

namespace pp {

namespace {

static const char kPPPContentDecryptorInterface[] =
    PPP_CONTENTDECRYPTOR_PRIVATE_INTERFACE;

void Initialize(PP_Instance instance,
                PP_Var key_system_arg) {
  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  pp::Var key_system_var(pp::PASS_REF, key_system_arg);
  if (!key_system_var.is_string())
    return;

  static_cast<ContentDecryptor_Private*>(object)->Initialize(
      key_system_var.AsString());
}

void CreateSession(PP_Instance instance,
                   uint32_t session_id,
                   PP_Var type_arg,
                   PP_Var init_data_arg) {
  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  pp::Var type_var(pp::PASS_REF, type_arg);
  if (!type_var.is_string())
    return;

  pp::Var init_data_var(pp::PASS_REF, init_data_arg);
  if (!init_data_var.is_array_buffer())
    return;
  pp::VarArrayBuffer init_data_array_buffer(init_data_var);

  static_cast<ContentDecryptor_Private*>(object)
      ->CreateSession(session_id, type_var.AsString(), init_data_array_buffer);
}

void UpdateSession(PP_Instance instance,
                   uint32_t session_id,
                   PP_Var response_arg) {
  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  pp::Var response_var(pp::PASS_REF, response_arg);
  if (!response_var.is_array_buffer())
    return;
  pp::VarArrayBuffer response(response_var);

  static_cast<ContentDecryptor_Private*>(object)
      ->UpdateSession(session_id, response);
}

void ReleaseSession(PP_Instance instance, uint32_t session_id) {
  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  static_cast<ContentDecryptor_Private*>(object)->ReleaseSession(session_id);
}


void Decrypt(PP_Instance instance,
             PP_Resource encrypted_resource,
             const PP_EncryptedBlockInfo* encrypted_block_info) {
  pp::Buffer_Dev encrypted_block(encrypted_resource);

  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  static_cast<ContentDecryptor_Private*>(object)->Decrypt(
      encrypted_block,
      *encrypted_block_info);
}

void InitializeAudioDecoder(
    PP_Instance instance,
    const PP_AudioDecoderConfig* decoder_config,
    PP_Resource extra_data_resource) {
  pp::Buffer_Dev extra_data_buffer(extra_data_resource);

  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  static_cast<ContentDecryptor_Private*>(object)->InitializeAudioDecoder(
      *decoder_config,
      extra_data_buffer);
}

void InitializeVideoDecoder(
    PP_Instance instance,
    const PP_VideoDecoderConfig* decoder_config,
    PP_Resource extra_data_resource) {
  pp::Buffer_Dev extra_data_buffer(extra_data_resource);

  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  static_cast<ContentDecryptor_Private*>(object)->InitializeVideoDecoder(
      *decoder_config,
      extra_data_buffer);
}

void DeinitializeDecoder(PP_Instance instance,
                         PP_DecryptorStreamType decoder_type,
                         uint32_t request_id) {
  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;
  static_cast<ContentDecryptor_Private*>(object)->DeinitializeDecoder(
      decoder_type,
      request_id);
}

void ResetDecoder(PP_Instance instance,
                  PP_DecryptorStreamType decoder_type,
                  uint32_t request_id) {
  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;
  static_cast<ContentDecryptor_Private*>(object)->ResetDecoder(decoder_type,
                                                               request_id);
}

void DecryptAndDecode(PP_Instance instance,
                      PP_DecryptorStreamType decoder_type,
                      PP_Resource encrypted_resource,
                      const PP_EncryptedBlockInfo* encrypted_block_info) {
  pp::Buffer_Dev encrypted_buffer(encrypted_resource);

  void* object =
      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
  if (!object)
    return;

  static_cast<ContentDecryptor_Private*>(object)->DecryptAndDecode(
      decoder_type,
      encrypted_buffer,
      *encrypted_block_info);
}

const PPP_ContentDecryptor_Private ppp_content_decryptor = {
  &Initialize,
  &CreateSession,
  &UpdateSession,
  &ReleaseSession,
  &Decrypt,
  &InitializeAudioDecoder,
  &InitializeVideoDecoder,
  &DeinitializeDecoder,
  &ResetDecoder,
  &DecryptAndDecode
};

template <> const char* interface_name<PPB_ContentDecryptor_Private>() {
  return PPB_CONTENTDECRYPTOR_PRIVATE_INTERFACE;
}

}  // namespace

ContentDecryptor_Private::ContentDecryptor_Private(Instance* instance)
    : associated_instance_(instance) {
  Module::Get()->AddPluginInterface(kPPPContentDecryptorInterface,
                                    &ppp_content_decryptor);
  instance->AddPerInstanceObject(kPPPContentDecryptorInterface, this);
}

ContentDecryptor_Private::~ContentDecryptor_Private() {
  Instance::RemovePerInstanceObject(associated_instance_,
                                    kPPPContentDecryptorInterface,
                                    this);
}

void ContentDecryptor_Private::SessionCreated(
    uint32_t session_id,
    const std::string& web_session_id) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    pp::Var web_session_id_var(web_session_id);
    get_interface<PPB_ContentDecryptor_Private>()->SessionCreated(
        associated_instance_.pp_instance(),
        session_id,
        web_session_id_var.pp_var());
  }
}

void ContentDecryptor_Private::SessionMessage(uint32_t session_id,
                                              pp::VarArrayBuffer message,
                                              const std::string& default_url) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    pp::Var default_url_var(default_url);
    get_interface<PPB_ContentDecryptor_Private>()->SessionMessage(
        associated_instance_.pp_instance(),
        session_id,
        message.pp_var(),
        default_url_var.pp_var());
  }
}

void ContentDecryptor_Private::SessionReady(uint32_t session_id) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->SessionReady(
        associated_instance_.pp_instance(), session_id);
  }
}

void ContentDecryptor_Private::SessionClosed(uint32_t session_id) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->SessionClosed(
        associated_instance_.pp_instance(), session_id);
  }
}

void ContentDecryptor_Private::SessionError(uint32_t session_id,
                                            int32_t media_error,
                                            int32_t system_code) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->SessionError(
        associated_instance_.pp_instance(),
        session_id,
        media_error,
        system_code);
  }
}

void ContentDecryptor_Private::DeliverBlock(
    pp::Buffer_Dev decrypted_block,
    const PP_DecryptedBlockInfo& decrypted_block_info) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->DeliverBlock(
        associated_instance_.pp_instance(),
        decrypted_block.pp_resource(),
        &decrypted_block_info);
  }
}

void ContentDecryptor_Private::DecoderInitializeDone(
    PP_DecryptorStreamType decoder_type,
    uint32_t request_id,
    bool success) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->DecoderInitializeDone(
        associated_instance_.pp_instance(),
        decoder_type,
        request_id,
        PP_FromBool(success));
  }
}

void ContentDecryptor_Private::DecoderDeinitializeDone(
    PP_DecryptorStreamType decoder_type,
    uint32_t request_id) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->DecoderDeinitializeDone(
        associated_instance_.pp_instance(),
        decoder_type,
        request_id);
  }
}

void ContentDecryptor_Private::DecoderResetDone(
    PP_DecryptorStreamType decoder_type,
    uint32_t request_id) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->DecoderResetDone(
        associated_instance_.pp_instance(),
        decoder_type,
        request_id);
  }
}

void ContentDecryptor_Private::DeliverFrame(
    pp::Buffer_Dev decrypted_frame,
    const PP_DecryptedFrameInfo& decrypted_frame_info) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->DeliverFrame(
        associated_instance_.pp_instance(),
        decrypted_frame.pp_resource(),
        &decrypted_frame_info);
  }
}

void ContentDecryptor_Private::DeliverSamples(
    pp::Buffer_Dev audio_frames,
    const PP_DecryptedSampleInfo& decrypted_sample_info) {
  if (has_interface<PPB_ContentDecryptor_Private>()) {
    get_interface<PPB_ContentDecryptor_Private>()->DeliverSamples(
        associated_instance_.pp_instance(),
        audio_frames.pp_resource(),
        &decrypted_sample_info);
  }
}

}  // namespace pp