Move audio messages to their own file.

content/common/audio_messages.h

+// Copyright (c) 2011 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.
+
+// IPC messages for the audio.
+// Multiply-included message file, hence no include guard.
+
+#include "base/shared_memory.h"
+#include "base/sync_socket.h"
+#include "content/common/audio_stream_state.h"
+#include "ipc/ipc_message_macros.h"
+#include "media/audio/audio_buffers_state.h"
+#include "media/audio/audio_parameters.h"
+
+#define IPC_MESSAGE_START AudioMsgStart
+
+IPC_ENUM_TRAITS(AudioStreamState)
+IPC_ENUM_TRAITS(AudioParameters::Format)
+
+IPC_STRUCT_TRAITS_BEGIN(AudioBuffersState)
+  IPC_STRUCT_TRAITS_MEMBER(pending_bytes)
+  IPC_STRUCT_TRAITS_MEMBER(hardware_delay_bytes)
+  IPC_STRUCT_TRAITS_MEMBER(timestamp)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(AudioParameters)
+  IPC_STRUCT_TRAITS_MEMBER(format)
+  IPC_STRUCT_TRAITS_MEMBER(channels)
+  IPC_STRUCT_TRAITS_MEMBER(sample_rate)
+  IPC_STRUCT_TRAITS_MEMBER(bits_per_sample)
+  IPC_STRUCT_TRAITS_MEMBER(samples_per_packet)
+IPC_STRUCT_TRAITS_END()
+
+// Messages sent from the browser to the renderer.
+
+// Sent by AudioRendererHost to renderer to request an audio packet.
+IPC_MESSAGE_ROUTED2(AudioMsg_RequestPacket,
+                    int /* stream id */,
+                    AudioBuffersState)
+
+// Tell the renderer process that the audio stream has been created, renderer
+// process would be given a ShareMemoryHandle that it should write to from
+// then on.
+IPC_MESSAGE_ROUTED3(AudioMsg_NotifyStreamCreated,
+                    int /* stream id */,
+                    base::SharedMemoryHandle /* handle */,
+                    uint32 /* length */)
+
+// Tell the renderer process that a low latency audio stream has been created,
+// renderer process would be given a SyncSocket that it should write to from
+// then on.
+#if defined(OS_WIN)
+IPC_MESSAGE_ROUTED4(AudioMsg_NotifyLowLatencyStreamCreated,
+                    int /* stream id */,
+                    base::SharedMemoryHandle /* handle */,
+                    base::SyncSocket::Handle /* socket handle */,
+                    uint32 /* length */)
+#else
+IPC_MESSAGE_ROUTED4(AudioMsg_NotifyLowLatencyStreamCreated,
+                    int /* stream id */,
+                    base::SharedMemoryHandle /* handle */,
+                    base::FileDescriptor /* socket handle */,
+                    uint32 /* length */)
+#endif
+
+// Notification message sent from AudioRendererHost to renderer for state
+// update after the renderer has requested a Create/Start/Close.
+IPC_MESSAGE_ROUTED2(AudioMsg_NotifyStreamStateChanged,
+                    int /* stream id */,
+                    AudioStreamState /* new state */)
+
+IPC_MESSAGE_ROUTED2(AudioMsg_NotifyStreamVolume,
+                    int /* stream id */,
+                    double /* volume */)
+
+// Messages sent from the renderer to the browser.
+
+// Request that got sent to browser for creating an audio output stream
+IPC_MESSAGE_ROUTED3(AudioHostMsg_CreateStream,
+                    int /* stream_id */,
+                    AudioParameters /* params */,
+                    bool /* low-latency */)
+
+// Tell the browser the audio buffer prepared for stream
+// (render_view_id, stream_id) is filled and is ready to be consumed.
+IPC_MESSAGE_ROUTED2(AudioHostMsg_NotifyPacketReady,
+                    int /* stream_id */,
+                    uint32 /* packet size */)
+
+// Start buffering and play the audio stream specified by
+// (render_view_id, stream_id).
+IPC_MESSAGE_ROUTED1(AudioHostMsg_PlayStream,
+                    int /* stream_id */)
+
+// Pause the audio stream specified by (render_view_id, stream_id).
+IPC_MESSAGE_ROUTED1(AudioHostMsg_PauseStream,
+                    int /* stream_id */)
+
+// Discard all buffered audio data for the specified audio stream.
+IPC_MESSAGE_ROUTED1(AudioHostMsg_FlushStream,
+                    int /* stream_id */)
+
+// Close an audio stream specified by (render_view_id, stream_id).
+IPC_MESSAGE_ROUTED1(AudioHostMsg_CloseStream,
+                    int /* stream_id */)
+
+// Get audio volume of the stream specified by (render_view_id, stream_id).
+IPC_MESSAGE_ROUTED1(AudioHostMsg_GetVolume,
+                    int /* stream_id */)
+
+// Set audio volume of the stream specified by (render_view_id, stream_id).
+// TODO(hclam): change this to vector if we have channel numbers other than 2.
+IPC_MESSAGE_ROUTED2(AudioHostMsg_SetVolume,
+                    int /* stream_id */,
+                    double /* volume */)