webkit/plugins/ppapi/ppb_audio_impl.cc

   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 #include "webkit/plugins/ppapi/ppb_audio_impl.h"
   6
   7 #include "base/logging.h"
   8 #include "media/audio/audio_output_controller.h"
   9 #include "ppapi/c/pp_completion_callback.h"
  10 #include "ppapi/c/ppb_audio.h"
  11 #include "ppapi/c/ppb_audio_config.h"
  12 #include "ppapi/c/trusted/ppb_audio_trusted.h"
  13 #include "ppapi/shared_impl/resource_tracker.h"
  14 #include "ppapi/thunk/enter.h"
  15 #include "ppapi/thunk/ppb_audio_config_api.h"
  16 #include "ppapi/thunk/thunk.h"
  17 #include "webkit/plugins/ppapi/common.h"
  18 #include "webkit/plugins/ppapi/resource_helper.h"
  19
  20 using ppapi::PpapiGlobals;
  21 using ppapi::thunk::EnterResourceNoLock;
  22 using ppapi::thunk::PPB_Audio_API;
  23 using ppapi::thunk::PPB_AudioConfig_API;
  24 using ppapi::TrackedCallback;
  25
  26 namespace webkit {
  27 namespace ppapi {
  28
  29 // PPB_Audio_Impl --------------------------------------------------------------
  30
  31 PPB_Audio_Impl::PPB_Audio_Impl(PP_Instance instance)
  32     : Resource(::ppapi::OBJECT_IS_IMPL, instance),
  33       audio_(NULL),
  34       sample_frame_count_(0) {
  35 }
  36
  37 PPB_Audio_Impl::~PPB_Audio_Impl() {
  38   // Calling ShutDown() makes sure StreamCreated cannot be called anymore and
  39   // releases the audio data associated with the pointer. Note however, that
  40   // until ShutDown returns, StreamCreated may still be called. This will be
  41   // OK since we'll just immediately clean up the data it stored later in this
  42   // destructor.
  43   if (audio_) {
  44     audio_->ShutDown();
  45     audio_ = NULL;
  46   }
  47 }
  48
  49 // static
  50 PP_Resource PPB_Audio_Impl::Create(PP_Instance instance,
  51                                    PP_Resource config,
  52                                    PPB_Audio_Callback audio_callback,
  53                                    void* user_data) {
  54   scoped_refptr<PPB_Audio_Impl> audio(new PPB_Audio_Impl(instance));
  55   if (!audio->Init(config, audio_callback, user_data))
  56     return 0;
  57   return audio->GetReference();
  58 }
  59
  60 PPB_Audio_API* PPB_Audio_Impl::AsPPB_Audio_API() {
  61   return this;
  62 }
  63
  64 bool PPB_Audio_Impl::Init(PP_Resource config,
  65                           PPB_Audio_Callback callback, void* user_data) {
  66   // Validate the config and keep a reference to it.
  67   EnterResourceNoLock<PPB_AudioConfig_API> enter(config, true);
  68   if (enter.failed())
  69     return false;
  70   config_ = config;
  71
  72   if (!callback)
  73     return false;
  74   SetCallback(callback, user_data);
  75
  76   PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
  77   if (!plugin_delegate)
  78     return false;
  79
  80   // When the stream is created, we'll get called back on StreamCreated().
  81   CHECK(!audio_);
  82   audio_ = plugin_delegate->CreateAudioOutput(
  83       enter.object()->GetSampleRate(), enter.object()->GetSampleFrameCount(),
  84       this);
  85   sample_frame_count_ = enter.object()->GetSampleFrameCount();
  86   return audio_ != NULL;
  87 }
  88
  89 PP_Resource PPB_Audio_Impl::GetCurrentConfig() {
  90   // AddRef on behalf of caller, while keeping a ref for ourselves.
  91   PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(config_);
  92   return config_;
  93 }
  94
  95 PP_Bool PPB_Audio_Impl::StartPlayback() {
  96   if (!audio_)
  97     return PP_FALSE;
  98   if (playing())
  99     return PP_TRUE;
 100   SetStartPlaybackState();
 101   return BoolToPPBool(audio_->StartPlayback());
 102 }
 103
 104 PP_Bool PPB_Audio_Impl::StopPlayback() {
 105   if (!audio_)
 106     return PP_FALSE;
 107   if (!playing())
 108     return PP_TRUE;
 109   if (!audio_->StopPlayback())
 110     return PP_FALSE;
 111   SetStopPlaybackState();
 112   return PP_TRUE;
 113 }
 114
 115 int32_t PPB_Audio_Impl::OpenTrusted(
 116     PP_Resource config,
 117     scoped_refptr<TrackedCallback> create_callback) {
 118   // Validate the config and keep a reference to it.
 119   EnterResourceNoLock<PPB_AudioConfig_API> enter(config, true);
 120   if (enter.failed())
 121     return PP_ERROR_FAILED;
 122   config_ = config;
 123
 124   PluginDelegate* plugin_delegate = ResourceHelper::GetPluginDelegate(this);
 125   if (!plugin_delegate)
 126     return PP_ERROR_FAILED;
 127
 128   // When the stream is created, we'll get called back on StreamCreated().
 129   DCHECK(!audio_);
 130   audio_ = plugin_delegate->CreateAudioOutput(
 131       enter.object()->GetSampleRate(), enter.object()->GetSampleFrameCount(),
 132       this);
 133   if (!audio_)
 134     return PP_ERROR_FAILED;
 135
 136   // At this point, we are guaranteeing ownership of the completion
 137   // callback.  Audio promises to fire the completion callback
 138   // once and only once.
 139   SetCreateCallback(create_callback);
 140
 141   return PP_OK_COMPLETIONPENDING;
 142 }
 143
 144 int32_t PPB_Audio_Impl::GetSyncSocket(int* sync_socket) {
 145   return GetSyncSocketImpl(sync_socket);
 146 }
 147
 148 int32_t PPB_Audio_Impl::GetSharedMemory(int* shm_handle,
 149                                         uint32_t* shm_size) {
 150   return GetSharedMemoryImpl(shm_handle, shm_size);
 151 }
 152
 153 void PPB_Audio_Impl::OnSetStreamInfo(
 154     base::SharedMemoryHandle shared_memory_handle,
 155     size_t shared_memory_size,
 156     base::SyncSocket::Handle socket_handle) {
 157   SetStreamInfo(pp_instance(), shared_memory_handle, shared_memory_size,
 158                 socket_handle, sample_frame_count_);
 159 }
 160
 161 }  // namespace ppapi
 162 }  // namespace webkit