content/renderer/pepper/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 "content/renderer/pepper/ppb_audio_impl.h"
   6
   7 #include "base/logging.h"
   8 #include "content/renderer/pepper/pepper_platform_audio_output.h"
   9 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
  10 #include "content/renderer/pepper/plugin_instance_throttler_impl.h"
  11 #include "content/renderer/render_frame_impl.h"
  12 #include "content/renderer/render_view_impl.h"
  13 #include "media/audio/audio_output_controller.h"
  14 #include "ppapi/c/pp_completion_callback.h"
  15 #include "ppapi/c/ppb_audio.h"
  16 #include "ppapi/c/ppb_audio_config.h"
  17 #include "ppapi/shared_impl/resource_tracker.h"
  18 #include "ppapi/thunk/enter.h"
  19 #include "ppapi/thunk/ppb_audio_config_api.h"
  20 #include "ppapi/thunk/thunk.h"
  21
  22 using ppapi::PpapiGlobals;
  23 using ppapi::thunk::EnterResourceNoLock;
  24 using ppapi::thunk::PPB_Audio_API;
  25 using ppapi::thunk::PPB_AudioConfig_API;
  26 using ppapi::TrackedCallback;
  27
  28 namespace content {
  29
  30 // PPB_Audio_Impl --------------------------------------------------------------
  31
  32 PPB_Audio_Impl::PPB_Audio_Impl(PP_Instance instance)
  33     : Resource(ppapi::OBJECT_IS_IMPL, instance), audio_(NULL) {}
  34
  35 PPB_Audio_Impl::~PPB_Audio_Impl() {
  36   // Calling ShutDown() makes sure StreamCreated cannot be called anymore and
  37   // releases the audio data associated with the pointer. Note however, that
  38   // until ShutDown returns, StreamCreated may still be called. This will be
  39   // OK since we'll just immediately clean up the data it stored later in this
  40   // destructor.
  41   if (audio_) {
  42     audio_->ShutDown();
  43     audio_ = NULL;
  44   }
  45 }
  46
  47 PPB_Audio_API* PPB_Audio_Impl::AsPPB_Audio_API() { return this; }
  48
  49 PP_Resource PPB_Audio_Impl::GetCurrentConfig() {
  50   // AddRef on behalf of caller, while keeping a ref for ourselves.
  51   PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(config_);
  52   return config_;
  53 }
  54
  55 PP_Bool PPB_Audio_Impl::StartPlayback() {
  56   if (!audio_)
  57     return PP_FALSE;
  58   if (playing())
  59     return PP_TRUE;
  60   SetStartPlaybackState();
  61   return PP_FromBool(audio_->StartPlayback());
  62 }
  63
  64 PP_Bool PPB_Audio_Impl::StopPlayback() {
  65   if (!audio_)
  66     return PP_FALSE;
  67   if (!playing())
  68     return PP_TRUE;
  69   if (!audio_->StopPlayback())
  70     return PP_FALSE;
  71   SetStopPlaybackState();
  72   return PP_TRUE;
  73 }
  74
  75 int32_t PPB_Audio_Impl::Open(PP_Resource config,
  76                              scoped_refptr<TrackedCallback> create_callback) {
  77   // Validate the config and keep a reference to it.
  78   EnterResourceNoLock<PPB_AudioConfig_API> enter(config, true);
  79   if (enter.failed())
  80     return PP_ERROR_FAILED;
  81   config_ = config;
  82
  83   PepperPluginInstanceImpl* instance = static_cast<PepperPluginInstanceImpl*>(
  84       PepperPluginInstance::Get(pp_instance()));
  85   if (!instance)
  86     return PP_ERROR_FAILED;
  87
  88   // Prevent any throttling since we are playing audio. This stopgap prevents
  89   // video from appearing 'frozen' while the audio track plays.
  90   if (instance->throttler() && instance->throttler()->power_saver_enabled()) {
  91     instance->throttler()->MarkPluginEssential(
  92         PluginInstanceThrottler::UNTHROTTLE_METHOD_BY_AUDIO);
  93   }
  94
  95   // When the stream is created, we'll get called back on StreamCreated().
  96   DCHECK(!audio_);
  97   audio_ = PepperPlatformAudioOutput::Create(
  98       static_cast<int>(enter.object()->GetSampleRate()),
  99       static_cast<int>(enter.object()->GetSampleFrameCount()),
 100       instance->GetRenderView()->GetRoutingID(),
 101       instance->render_frame()->GetRoutingID(),
 102       this);
 103   if (!audio_)
 104     return PP_ERROR_FAILED;
 105
 106   // At this point, we are guaranteeing ownership of the completion
 107   // callback.  Audio promises to fire the completion callback
 108   // once and only once.
 109   SetCreateCallback(create_callback);
 110
 111   return PP_OK_COMPLETIONPENDING;
 112 }
 113
 114 int32_t PPB_Audio_Impl::GetSyncSocket(int* sync_socket) {
 115   return GetSyncSocketImpl(sync_socket);
 116 }
 117
 118 int32_t PPB_Audio_Impl::GetSharedMemory(int* shm_handle, uint32_t* shm_size) {
 119   return GetSharedMemoryImpl(shm_handle, shm_size);
 120 }
 121
 122 void PPB_Audio_Impl::OnSetStreamInfo(
 123     base::SharedMemoryHandle shared_memory_handle,
 124     size_t shared_memory_size,
 125     base::SyncSocket::Handle socket_handle) {
 126   EnterResourceNoLock<PPB_AudioConfig_API> enter(config_, true);
 127   SetStreamInfo(pp_instance(),
 128                 shared_memory_handle,
 129                 shared_memory_size,
 130                 socket_handle,
 131                 enter.object()->GetSampleRate(),
 132                 enter.object()->GetSampleFrameCount());
 133 }
 134
 135 }  // namespace content