Introduce AudioHardwareConfig for renderer side audio device info.

content/renderer/media/audio_hardware.cc

-// 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 "content/renderer/media/audio_hardware.h"
-
-#include "base/logging.h"
-#include "content/common/view_messages.h"
-#include "content/renderer/render_thread_impl.h"
-
-using media::ChannelLayout;
-using media::CHANNEL_LAYOUT_NONE;
-
-static int output_sample_rate = 0;
-static int input_sample_rate = 0;
-static size_t output_buffer_size = 0;
-static ChannelLayout input_channel_layout = CHANNEL_LAYOUT_NONE;
-
-namespace content {
-
-int GetAudioOutputSampleRate() {
-  DCHECK(RenderThreadImpl::current() != NULL);
-
-  if (!output_sample_rate) {
-    RenderThreadImpl::current()->Send(
-        new ViewHostMsg_GetHardwareSampleRate(&output_sample_rate));
-  }
-  return output_sample_rate;
-}
-
-int GetAudioInputSampleRate() {
-  DCHECK(RenderThreadImpl::current() != NULL);
-
-  if (!input_sample_rate) {
-    RenderThreadImpl::current()->Send(
-        new ViewHostMsg_GetHardwareInputSampleRate(&input_sample_rate));
-  }
-  return input_sample_rate;
-}
-
-size_t GetAudioOutputBufferSize() {
-  DCHECK(RenderThreadImpl::current() != NULL);
-
-  if (!output_buffer_size) {
-    uint32 buffer_size = 0;
-    RenderThreadImpl::current()->Send(
-        new ViewHostMsg_GetHardwareBufferSize(&buffer_size));
-    output_buffer_size = buffer_size;
-  }
-
-  return output_buffer_size;
-}
-
-ChannelLayout GetAudioInputChannelLayout() {
-  DCHECK(RenderThreadImpl::current() != NULL);
-
-  if (input_channel_layout == CHANNEL_LAYOUT_NONE) {
-    ChannelLayout layout = CHANNEL_LAYOUT_NONE;
-    RenderThreadImpl::current()->Send(
-        new ViewHostMsg_GetHardwareInputChannelLayout(&layout));
-    input_channel_layout = layout;
-  }
-
-  return input_channel_layout;
-}
-
-void ResetAudioCache() {
-  DCHECK(RenderThreadImpl::current() != NULL);
-
-  output_sample_rate = 0.0;
-  input_sample_rate = 0.0;
-  output_buffer_size = 0;
-  input_channel_layout = CHANNEL_LAYOUT_NONE;
-}
-
-}  // namespace content