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// 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/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_message_filter.h"
#include "content/renderer/render_thread_impl.h"
#include "media/base/audio_hardware_config.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,
source_render_view_id, client)) {
// Balanced by Release invoked in
// PepperPlatformAudioOutputImpl::ShutDownOnIOThread().
audio_output->AddRef();
return audio_output.get();
}
return NULL;
}
bool PepperPlatformAudioOutputImpl::StartPlayback() {
if (ipc_) {
ChildProcess::current()->io_message_loop()->PostTask(
FROM_HERE,
base::Bind(&PepperPlatformAudioOutputImpl::StartPlaybackOnIOThread,
this));
return true;
}
return false;
}
bool PepperPlatformAudioOutputImpl::StopPlayback() {
if (ipc_) {
ChildProcess::current()->io_message_loop()->PostTask(
FROM_HERE,
base::Bind(&PepperPlatformAudioOutputImpl::StopPlaybackOnIOThread,
this));
return true;
}
return false;
}
void PepperPlatformAudioOutputImpl::ShutDown() {
// Called on the main thread to stop all audio callbacks. We must only change
// the client on the main thread, and the delegates from the I/O thread.
client_ = NULL;
ChildProcess::current()->io_message_loop()->PostTask(
FROM_HERE,
base::Bind(&PepperPlatformAudioOutputImpl::ShutDownOnIOThread, this));
}
void PepperPlatformAudioOutputImpl::OnStateChanged(
media::AudioOutputIPCDelegate::State state) {
}
void PepperPlatformAudioOutputImpl::OnStreamCreated(
base::SharedMemoryHandle handle,
base::SyncSocket::Handle socket_handle,
int length) {
#if defined(OS_WIN)
DCHECK(handle);
DCHECK(socket_handle);
#else
DCHECK_NE(-1, handle.fd);
DCHECK_NE(-1, socket_handle);
#endif
DCHECK(length);
if (base::MessageLoopProxy::current() == main_message_loop_proxy_) {
// Must dereference the client only on the main thread. Shutdown may have
// occurred while the request was in-flight, so we need to NULL check.
if (client_)
client_->StreamCreated(handle, length, socket_handle);
} else {
main_message_loop_proxy_->PostTask(FROM_HERE,
base::Bind(&PepperPlatformAudioOutputImpl::OnStreamCreated, this,
handle, socket_handle, length));
}
}
void PepperPlatformAudioOutputImpl::OnIPCClosed() {
ipc_.reset();
}
PepperPlatformAudioOutputImpl::~PepperPlatformAudioOutputImpl() {
// Make sure we have been shut down. Warning: this will usually happen on
// the I/O thread!
DCHECK(!ipc_);
DCHECK(!client_);
}
PepperPlatformAudioOutputImpl::PepperPlatformAudioOutputImpl()
: client_(NULL),
main_message_loop_proxy_(base::MessageLoopProxy::current()) {
}
bool PepperPlatformAudioOutputImpl::Initialize(
int sample_rate,
int frames_per_buffer,
int source_render_view_id,
webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
DCHECK(client);
client_ = client;
RenderThreadImpl* const render_thread = RenderThreadImpl::current();
ipc_ = render_thread->audio_message_filter()->
CreateAudioOutputIPC(source_render_view_id);
CHECK(ipc_);
media::AudioParameters params(
media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
media::CHANNEL_LAYOUT_STEREO, sample_rate, 16, frames_per_buffer);
ChildProcess::current()->io_message_loop()->PostTask(
FROM_HERE,
base::Bind(&PepperPlatformAudioOutputImpl::InitializeOnIOThread,
this, params));
return true;
}
void PepperPlatformAudioOutputImpl::InitializeOnIOThread(
const media::AudioParameters& params) {
DCHECK(ChildProcess::current()->io_message_loop_proxy()->
BelongsToCurrentThread());
const int kSessionId = 0;
if (ipc_)
ipc_->CreateStream(this, params, kSessionId);
}
void PepperPlatformAudioOutputImpl::StartPlaybackOnIOThread() {
DCHECK(ChildProcess::current()->io_message_loop_proxy()->
BelongsToCurrentThread());
if (ipc_)
ipc_->PlayStream();
}
void PepperPlatformAudioOutputImpl::StopPlaybackOnIOThread() {
DCHECK(ChildProcess::current()->io_message_loop_proxy()->
BelongsToCurrentThread());
if (ipc_)
ipc_->PauseStream();
}
void PepperPlatformAudioOutputImpl::ShutDownOnIOThread() {
DCHECK(ChildProcess::current()->io_message_loop_proxy()->
BelongsToCurrentThread());
// Make sure we don't call shutdown more than once.
if (!ipc_)
return;
ipc_->CloseStream();
ipc_.reset();
Release(); // Release for the delegate, balances out the reference taken in
// PepperPluginDelegateImpl::CreateAudio.
}
} // namespace content
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