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      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(
     34       PP_AudioSampleRate sample_rate,
     35       uint32_t request_sample_frame_count);
     36   static uint32_t RecommendSampleFrameCount_1_1(
     37       PP_Instance instance,
     38       PP_AudioSampleRate sample_rate,
     39       uint32_t request_sample_frame_count);
     40   static PP_AudioSampleRate RecommendSampleRate(PP_Instance);
     41 
     42   // Resource overrides.
     43   virtual thunk::PPB_AudioConfig_API* AsPPB_AudioConfig_API() OVERRIDE;
     44 
     45   // PPB_AudioConfig_API implementation.
     46   virtual PP_AudioSampleRate GetSampleRate() OVERRIDE;
     47   virtual uint32_t GetSampleFrameCount() OVERRIDE;
     48 
     49  private:
     50   // You must call Init before using this object.
     51   PPB_AudioConfig_Shared(ResourceObjectType type, PP_Instance instance);
     52 
     53   // Returns false if the arguments are invalid, the object should not be
     54   // used in this case.
     55   bool Init(PP_AudioSampleRate sample_rate, uint32_t sample_frame_count);
     56 
     57   PP_AudioSampleRate sample_rate_;
     58   uint32_t sample_frame_count_;
     59 
     60   DISALLOW_COPY_AND_ASSIGN(PPB_AudioConfig_Shared);
     61 };
     62 
     63 }  // namespace ppapi
     64 
     65 #endif  // PPAPI_SHARED_IMPL_PPB_AUDIO_CONFIG_SHARED_H_
     66