Associate audio streams with their source/destination RenderView.

content/renderer/pepper/pepper_platform_audio_output_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/pepper/pepper_platform_audio_output_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "build/build_config.h"
 #include "content/common/child_process.h"
 #include "content/common/media/audio_messages.h"
 #include "content/renderer/media/audio_hardware.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/base/media_switches.h"
 
 namespace content {
 
 // static
 PepperPlatformAudioOutputImpl* PepperPlatformAudioOutputImpl::Create(
     int sample_rate,
     int frames_per_buffer,
+    int source_render_view_id,
     webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
   scoped_refptr<PepperPlatformAudioOutputImpl> audio_output(
       new PepperPlatformAudioOutputImpl());
-  if (audio_output->Initialize(sample_rate, frames_per_buffer, client)) {
+  if (audio_output->Initialize(sample_rate, frames_per_buffer,
+                               source_render_view_id, client)) {
     // Balanced by Release invoked in
     // PepperPlatformAudioOutputImpl::ShutDownOnIOThread().
     return audio_output.release();
   }
   return NULL;
 }
 
 bool PepperPlatformAudioOutputImpl::StartPlayback() {
   if (ipc_) {
     ChildProcess::current()->io_message_loop()->PostTask(
@@ skipping 68 matching lines @@
 PepperPlatformAudioOutputImpl::PepperPlatformAudioOutputImpl()
     : client_(NULL),
       stream_id_(0),
       main_message_loop_proxy_(base::MessageLoopProxy::current()) {
   ipc_ = RenderThreadImpl::current()->audio_message_filter();
 }
 
 bool PepperPlatformAudioOutputImpl::Initialize(
     int sample_rate,
     int frames_per_buffer,
+    int source_render_view_id,
     webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
   DCHECK(client);
-  // Make sure we don't call init more than once.
-  DCHECK_EQ(0, stream_id_);
-
   client_ = client;
 
   media::AudioParameters::Format format;
   const int kMaxFramesForLowLatency = 2047;
 
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
   if (!cmd_line->HasSwitch(switches::kDisableAudioOutputResampler)) {
     // Rely on AudioOutputResampler to handle any inconsistencies between the
     // hardware params required for low latency and the requested params.
     format = media::AudioParameters::AUDIO_PCM_LOW_LATENCY;
   } else if (sample_rate == GetAudioOutputSampleRate() &&
              frames_per_buffer <= kMaxFramesForLowLatency &&
              frames_per_buffer % content::GetAudioOutputBufferSize() == 0) {
     // Use the low latency back end if the client request is compatible, and
     // the sample count is low enough to justify using AUDIO_PCM_LOW_LATENCY.
     format = media::AudioParameters::AUDIO_PCM_LOW_LATENCY;
   } else {
     format = media::AudioParameters::AUDIO_PCM_LINEAR;
   }
 
   media::AudioParameters params(format, media::CHANNEL_LAYOUT_STEREO,
                                 sample_rate, 16, frames_per_buffer);
 
   ChildProcess::current()->io_message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PepperPlatformAudioOutputImpl::InitializeOnIOThread,
-                 this, params));
+                 this, params, source_render_view_id));
   return true;
 }
 
 void PepperPlatformAudioOutputImpl::InitializeOnIOThread(
-    const media::AudioParameters& params) {
+    const media::AudioParameters& params, int source_render_view_id) {
+  // Make sure we don't call init more than once.
+  DCHECK_EQ(0, stream_id_);
   stream_id_ = ipc_->AddDelegate(this);
+  DCHECK_NE(0, stream_id_);
+
   ipc_->CreateStream(stream_id_, params, 0);
+  ipc_->AssociateStreamWithProducer(stream_id_, source_render_view_id);
 }
 
 void PepperPlatformAudioOutputImpl::StartPlaybackOnIOThread() {
   if (stream_id_)
     ipc_->PlayStream(stream_id_);
 }
 
 void PepperPlatformAudioOutputImpl::StopPlaybackOnIOThread() {
   if (stream_id_)
     ipc_->PauseStream(stream_id_);
 }
 
 void PepperPlatformAudioOutputImpl::ShutDownOnIOThread() {
   // Make sure we don't call shutdown more than once.
   if (!stream_id_)
     return;
 
   ipc_->CloseStream(stream_id_);
   ipc_->RemoveDelegate(stream_id_);
   stream_id_ = 0;
 
   Release();  // Release for the delegate, balances out the reference taken in
               // PepperPluginDelegateImpl::CreateAudio.
 }
 
 }  // namespace content