Reland 153623004: Remove the unified IO code on the browser

content/browser/renderer_host/media/audio_renderer_host.cc

Index: content/browser/renderer_host/media/audio_renderer_host.cc
diff --git a/content/browser/renderer_host/media/audio_renderer_host.cc b/content/browser/renderer_host/media/audio_renderer_host.cc
index 165989e58e56e0d6caa7ce13e86afff04918b213..a1f371000fbc2704ae877274d48f809620cbaa61 100644
--- a/content/browser/renderer_host/media/audio_renderer_host.cc
+++ b/content/browser/renderer_host/media/audio_renderer_host.cc
@@ -36,7 +36,6 @@ class AudioRendererHost::AudioEntry
              int render_view_id,
              const media::AudioParameters& params,
              const std::string& output_device_id,
-             const std::string& input_device_id,
              scoped_ptr<base::SharedMemory> shared_memory,
              scoped_ptr<media::AudioOutputController::SyncReader> reader);
   virtual ~AudioEntry();
@@ -89,15 +88,13 @@ AudioRendererHost::AudioEntry::AudioEntry(
     AudioRendererHost* host, int stream_id, int render_view_id,
     const media::AudioParameters& params,
     const std::string& output_device_id,
-    const std::string& input_device_id,
     scoped_ptr<base::SharedMemory> shared_memory,
     scoped_ptr<media::AudioOutputController::SyncReader> reader)
     : host_(host),
       stream_id_(stream_id),
       render_view_id_(render_view_id),
       controller_(media::AudioOutputController::Create(
-          host->audio_manager_, this, params, output_device_id,
-          input_device_id, reader.get())),
+          host->audio_manager_, this, params, output_device_id, reader.get())),
       shared_memory_(shared_memory.Pass()),
       reader_(reader.Pass()) {
   DCHECK(controller_.get());
@@ -314,45 +311,24 @@ void AudioRendererHost::OnCreateStream(
   DCHECK_GT(render_view_id, 0);
 
   // media::AudioParameters is validated in the deserializer.
-  int input_channels = params.input_channels();
-  if (input_channels < 0 ||
-      input_channels > media::limits::kMaxChannels ||
-      LookupById(stream_id) != NULL) {
+  if (LookupById(stream_id) != NULL) {
     SendErrorMessage(stream_id);
     return;
   }
 
-  // When the |input_channels| is valid, clients are trying to create a unified
-  // IO stream which opens an input device mapping to the |session_id|.
   // Initialize the |output_device_id| to an empty string which indicates that
   // the default device should be used. If a StreamDeviceInfo instance was found
   // though, then we use the matched output device.
-  std::string input_device_id, output_device_id;
+  std::string output_device_id;
   const StreamDeviceInfo* info = media_stream_manager_->
       audio_input_device_manager()->GetOpenedDeviceInfoById(session_id);
   if (info)
     output_device_id = info->device.matched_output_device_id;
 
-  if (input_channels > 0) {
-    if (!info) {
-      SendErrorMessage(stream_id);
-      DLOG(WARNING) << "No permission has been granted to input stream with "
-                    << "session_id=" << session_id;
-      return;
-    }
-
-    input_device_id = info->device.id;
-  }
-
-  // Calculate output and input memory size.
-  int output_memory_size = AudioBus::CalculateMemorySize(params);
-  int frames = params.frames_per_buffer();
-  int input_memory_size = AudioBus::CalculateMemorySize(input_channels, frames);
-
   // Create the shared memory and share with the renderer process.
   // For synchronized I/O (if input_channels > 0) then we allocate
   // extra memory after the output data for the input data.
-  uint32 shared_memory_size = output_memory_size + input_memory_size;
+  uint32 shared_memory_size = AudioBus::CalculateMemorySize(params);;
   scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
   if (!shared_memory->CreateAndMapAnonymous(shared_memory_size)) {
     SendErrorMessage(stream_id);
@@ -360,7 +336,7 @@ void AudioRendererHost::OnCreateStream(
   }
 
   scoped_ptr<AudioSyncReader> reader(
-      new AudioSyncReader(shared_memory.get(), params, input_channels));
+      new AudioSyncReader(shared_memory.get(), params));
   if (!reader->Init()) {
     SendErrorMessage(stream_id);
     return;
@@ -373,14 +349,14 @@ void AudioRendererHost::OnCreateStream(
 
   scoped_ptr<AudioEntry> entry(new AudioEntry(
       this, stream_id, render_view_id, params, output_device_id,
-      input_device_id, shared_memory.Pass(),
+      shared_memory.Pass(),
       reader.PassAs<media::AudioOutputController::SyncReader>()));
   if (mirroring_manager_) {
     mirroring_manager_->AddDiverter(
         render_process_id_, entry->render_view_id(), entry->controller());
   }
   audio_entries_.insert(std::make_pair(stream_id, entry.release()));
-  audio_log_->OnCreated(stream_id, params, input_device_id, output_device_id);
+  audio_log_->OnCreated(stream_id, params, output_device_id);
 }
 
 void AudioRendererHost::OnPlayStream(int stream_id) {