ppapi/shared_impl/ppb_audio_config_shared.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef PPAPI_SHARED_IMPL_PPB_AUDIO_CONFIG_SHARED_H_
   6 #define PPAPI_SHARED_IMPL_PPB_AUDIO_CONFIG_SHARED_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "ppapi/shared_impl/resource.h"
  11 #include "ppapi/thunk/ppb_audio_config_api.h"
  12
  13 namespace ppapi {
  14
  15 const int kBitsPerAudioInputSample = 16;
  16 const int kAudioInputChannels = 1;
  17
  18 // TODO(dalecurtis, yzshen): PPAPI shouldn't hard code these values for all
  19 // clients.
  20 const int kBitsPerAudioOutputSample = 16;
  21 const int kAudioOutputChannels = 2;
  22
  23 class PPAPI_SHARED_EXPORT PPB_AudioConfig_Shared
  24     : public Resource,
  25       public thunk::PPB_AudioConfig_API {
  26  public:
  27   virtual ~PPB_AudioConfig_Shared();
  28
  29   static PP_Resource Create(ResourceObjectType type,
  30                             PP_Instance instance,
  31                             PP_AudioSampleRate sample_rate,
  32                             uint32_t sample_frame_count);
  33   static uint32_t RecommendSampleFrameCount_1_0(PP_AudioSampleRate sample_rate,
  34       uint32_t request_sample_frame_count);
  35   static uint32_t RecommendSampleFrameCount_1_1(PP_Instance instance,
  36       PP_AudioSampleRate sample_rate,
  37       uint32_t request_sample_frame_count);
  38   static PP_AudioSampleRate RecommendSampleRate(PP_Instance);
  39
  40   // Resource overrides.
  41   virtual thunk::PPB_AudioConfig_API* AsPPB_AudioConfig_API() OVERRIDE;
  42
  43   // PPB_AudioConfig_API implementation.
  44   virtual PP_AudioSampleRate GetSampleRate() OVERRIDE;
  45   virtual uint32_t GetSampleFrameCount() OVERRIDE;
  46
  47  private:
  48   // You must call Init before using this object.
  49   PPB_AudioConfig_Shared(ResourceObjectType type, PP_Instance instance);
  50
  51   // Returns false if the arguments are invalid, the object should not be
  52   // used in this case.
  53   bool Init(PP_AudioSampleRate sample_rate, uint32_t sample_frame_count);
  54
  55   PP_AudioSampleRate sample_rate_;
  56   uint32_t sample_frame_count_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(PPB_AudioConfig_Shared);
  59 };
  60
  61 }  // namespace ppapi
  62
  63 #endif  // PPAPI_SHARED_IMPL_PPB_AUDIO_CONFIG_SHARED_H_