ppapi/proxy/ppb_audio_config_proxy.cc

// 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.

#include "ppapi/proxy/ppb_audio_config_proxy.h"

#include "ppapi/c/ppb_audio_config.h"
#include "ppapi/proxy/plugin_dispatcher.h"
#include "ppapi/proxy/plugin_resource.h"
#include "ppapi/proxy/ppapi_messages.h"

namespace pp {
namespace proxy {

class AudioConfig : public PluginResource {
 public:
  AudioConfig(const HostResource& resource,
              PP_AudioSampleRate sample_rate,
              uint32_t sample_frame_count)
      : PluginResource(resource),
        sample_rate_(sample_rate),
        sample_frame_count_(sample_frame_count) {
  }
  virtual ~AudioConfig() {}

  // Resource overrides.
  virtual AudioConfig* AsAudioConfig() { return this; }

  PP_AudioSampleRate sample_rate() const { return sample_rate_; }
  uint32_t sample_frame_count() const { return sample_frame_count_; }

 private:
  PP_AudioSampleRate sample_rate_;
  uint32_t sample_frame_count_;

  DISALLOW_COPY_AND_ASSIGN(AudioConfig);
};

namespace {

PP_Resource CreateStereo16bit(PP_Instance instance,
                              PP_AudioSampleRate sample_rate,
                              uint32_t sample_frame_count) {
  HostResource resource;
  PluginDispatcher::GetForInstance(instance)->Send(
      new PpapiHostMsg_PPBAudioConfig_Create(
          INTERFACE_ID_PPB_AUDIO_CONFIG, instance,
          static_cast<int32_t>(sample_rate), sample_frame_count,
          &resource));
  if (resource.is_null())
    return 0;

  linked_ptr<AudioConfig> object(
      new AudioConfig(resource, sample_rate, sample_frame_count));
  return PluginResourceTracker::GetInstance()->AddResource(object);
}

uint32_t RecommendSampleFrameCount(PP_AudioSampleRate sample_rate,
                                   uint32_t requested_sample_frame_count) {
  // TODO(brettw) Currently we don't actually query to get a value from the
  // hardware, so we always return the input for in-range values.
  //
  // Danger: this code is duplicated in the audio config implementation.
  if (requested_sample_frame_count < PP_AUDIOMINSAMPLEFRAMECOUNT)
    return PP_AUDIOMINSAMPLEFRAMECOUNT;
  if (requested_sample_frame_count > PP_AUDIOMAXSAMPLEFRAMECOUNT)
    return PP_AUDIOMAXSAMPLEFRAMECOUNT;
  return requested_sample_frame_count;
}

PP_Bool IsAudioConfig(PP_Resource resource) {
  AudioConfig* object = PluginResource::GetAs<AudioConfig>(resource);
  return BoolToPPBool(!!object);
}

PP_AudioSampleRate GetSampleRate(PP_Resource config_id) {
  AudioConfig* object = PluginResource::GetAs<AudioConfig>(config_id);
  if (!object)
    return PP_AUDIOSAMPLERATE_NONE;
  return object->sample_rate();
}

uint32_t GetSampleFrameCount(PP_Resource config_id) {
  AudioConfig* object = PluginResource::GetAs<AudioConfig>(config_id);
  if (!object)
    return 0;
  return object->sample_frame_count();
}

const PPB_AudioConfig audio_config_interface = {
  &CreateStereo16bit,
  &RecommendSampleFrameCount,
  &IsAudioConfig,
  &GetSampleRate,
  &GetSampleFrameCount
};

InterfaceProxy* CreateAudioConfigProxy(Dispatcher* dispatcher,
                                       const void* target_interface) {
  return new PPB_AudioConfig_Proxy(dispatcher, target_interface);
}

}  // namespace

PPB_AudioConfig_Proxy::PPB_AudioConfig_Proxy(Dispatcher* dispatcher,
                                             const void* target_interface)
    : InterfaceProxy(dispatcher, target_interface) {
}

PPB_AudioConfig_Proxy::~PPB_AudioConfig_Proxy() {
}

// static
const InterfaceProxy::Info* PPB_AudioConfig_Proxy::GetInfo() {
  static const Info info = {
    &audio_config_interface,
    PPB_AUDIO_CONFIG_INTERFACE,
    INTERFACE_ID_PPB_AUDIO_CONFIG,
    false,
    &CreateAudioConfigProxy,
  };
  return &info;
}

bool PPB_AudioConfig_Proxy::OnMessageReceived(const IPC::Message& msg) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(PPB_AudioConfig_Proxy, msg)
    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBAudioConfig_Create,
                        OnMsgCreateStereo16Bit)
    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBAudioConfig_RecommendSampleFrameCount,
                        OnMsgRecommendSampleFrameCount)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

void PPB_AudioConfig_Proxy::OnMsgCreateStereo16Bit(PP_Instance instance,
                                                   int32_t sample_rate,
                                                   uint32_t sample_frame_count,
                                                   HostResource* result) {
  result->SetHostResource(instance,
      ppb_audio_config_target()->CreateStereo16Bit(
          instance, static_cast<PP_AudioSampleRate>(sample_rate),
          sample_frame_count));
}

void PPB_AudioConfig_Proxy::OnMsgRecommendSampleFrameCount(
    int32_t sample_rate,
    uint32_t requested_sample_frame_count,
    uint32_t* result) {
  *result = ppb_audio_config_target()->RecommendSampleFrameCount(
      static_cast<PP_AudioSampleRate>(sample_rate),
      requested_sample_frame_count);
}

}  // namespace proxy
}  // namespace pp