content/renderer/media/media_interface_provider.cc

// Copyright 2016 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 "content/renderer/media/media_interface_provider.h"

#include <string>

#include "base/bind.h"
#include "media/mojo/interfaces/content_decryption_module.mojom.h"
#include "media/mojo/interfaces/renderer.mojom.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "services/service_manager/public/cpp/interface_provider.h"

namespace content {

MediaInterfaceProvider::MediaInterfaceProvider(
    service_manager::InterfaceProvider* remote_interfaces)
    : remote_interfaces_(remote_interfaces), weak_factory_(this) {
  task_runner_ = base::ThreadTaskRunnerHandle::Get();
  weak_this_ = weak_factory_.GetWeakPtr();
}

MediaInterfaceProvider::~MediaInterfaceProvider() {
  DCHECK(task_runner_->BelongsToCurrentThread());
}

void MediaInterfaceProvider::GetInterface(const std::string& interface_name,
                                          mojo::ScopedMessagePipeHandle pipe) {
  DVLOG(1) << __func__;
  if (!task_runner_->BelongsToCurrentThread()) {
    task_runner_->PostTask(
        FROM_HERE, base::Bind(&MediaInterfaceProvider::GetInterface, weak_this_,
                              interface_name, base::Passed(&pipe)));
    return;
  }

  DCHECK(task_runner_->BelongsToCurrentThread());

  if (interface_name == media::mojom::ContentDecryptionModule::Name_) {
    GetMediaInterfaceFactory()->CreateCdm(
        media::mojom::ContentDecryptionModuleRequest(std::move(pipe)));
  } else if (interface_name == media::mojom::Renderer::Name_) {
    GetMediaInterfaceFactory()->CreateRenderer(
        std::string(), media::mojom::RendererRequest(std::move(pipe)));
  } else if (interface_name == media::mojom::AudioDecoder::Name_) {
    GetMediaInterfaceFactory()->CreateAudioDecoder(
        media::mojom::AudioDecoderRequest(std::move(pipe)));
  } else if (interface_name == media::mojom::VideoDecoder::Name_) {
    GetMediaInterfaceFactory()->CreateVideoDecoder(
        media::mojom::VideoDecoderRequest(std::move(pipe)));
  } else {
    NOTREACHED();
  }
}

media::mojom::InterfaceFactory*
MediaInterfaceProvider::GetMediaInterfaceFactory() {
  DVLOG(1) << __func__;
  DCHECK(task_runner_->BelongsToCurrentThread());

  if (!media_interface_factory_) {
    remote_interfaces_->GetInterface(&media_interface_factory_);
    media_interface_factory_.set_connection_error_handler(base::Bind(
        &MediaInterfaceProvider::OnConnectionError, base::Unretained(this)));
  }

  return media_interface_factory_.get();
}

void MediaInterfaceProvider::OnConnectionError() {
  DVLOG(1) << __func__;
  DCHECK(task_runner_->BelongsToCurrentThread());

  media_interface_factory_.reset();
}

}  // namespace content