text: // Copyright (c) 2017 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.
  
  #ifndef CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_OUTPUT_HOST_H_
  #define CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_OUTPUT_HOST_H_
  
  #include <stddef.h>
  #include <stdint.h>
  
  #include <memory>
  #include <string>
  
  #include "base/memory/unsafe_shared_memory_region.h"
  #include "base/sync_socket.h"
  #include "content/renderer/pepper/pepper_device_enumeration_host_helper.h"
  #include "ipc/ipc_platform_file.h"
  #include "ppapi/c/ppb_audio_config.h"
  #include "ppapi/host/host_message_context.h"
  #include "ppapi/host/resource_host.h"
  
  namespace content {
  class PepperPlatformAudioOutputDev;
  class RendererPpapiHostImpl;
  
  class PepperAudioOutputHost : public ppapi::host::ResourceHost {
   public:
    PepperAudioOutputHost(RendererPpapiHostImpl* host,
                          PP_Instance instance,
                          PP_Resource resource);
  
    PepperAudioOutputHost(const PepperAudioOutputHost&) = delete;
    PepperAudioOutputHost& operator=(const PepperAudioOutputHost&) = delete;
  
    ~PepperAudioOutputHost() override;
  
    int32_t OnResourceMessageReceived(
        const IPC::Message& msg,
        ppapi::host::HostMessageContext* context) override;
  
    // Called when the stream is created.
    void StreamCreated(base::UnsafeSharedMemoryRegion shared_memory_region,
                       base::SyncSocket::ScopedHandle socket);
    void StreamCreationFailed();
    void SetVolume(double volume);
  
   private:
    int32_t OnOpen(ppapi::host::HostMessageContext* context,
                   const std::string& device_id,
                   PP_AudioSampleRate sample_rate,
                   uint32_t sample_frame_count);
    int32_t OnStartOrStop(ppapi::host::HostMessageContext* context,
                          bool playback);
    int32_t OnClose(ppapi::host::HostMessageContext* context);
  
    void OnOpenComplete(int32_t result,
                        base::UnsafeSharedMemoryRegion shared_memory_region,
                        base::SyncSocket::ScopedHandle socket_handle);
  
    int32_t GetRemoteHandles(
        const base::SyncSocket& socket,
        const base::UnsafeSharedMemoryRegion& shared_memory_region,
        IPC::PlatformFileForTransit* remote_socket_handle,
        base::UnsafeSharedMemoryRegion* remote_shared_memory_region);
  
    void Close();
  
    void SendOpenReply(int32_t result);
  
    // Non-owning pointer.
    RendererPpapiHostImpl* renderer_ppapi_host_;
  
    ppapi::host::ReplyMessageContext open_context_;
  
    // Audio output object that we delegate audio IPC through.
    // We don't own this pointer but are responsible for calling Shutdown on it.
    PepperPlatformAudioOutputDev* audio_output_;
  
    PepperDeviceEnumerationHostHelper enumeration_helper_;
  };
  
  }  // namespace content
  
  #endif  // CONTENT_RENDERER_PEPPER_PEPPER_AUDIO_OUTPUT_HOST_H_
  