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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_hardware.h"
#include "content/renderer/render_thread_impl.h"
PepperPlatformAudioOutputImpl::PepperPlatformAudioOutputImpl()
: client_(NULL),
stream_id_(0),
main_message_loop_proxy_(base::MessageLoopProxy::current()) {
filter_ = RenderThreadImpl::current()->audio_message_filter();
}
PepperPlatformAudioOutputImpl::~PepperPlatformAudioOutputImpl() {
// Make sure we have been shut down. Warning: this will usually happen on
// the I/O thread!
DCHECK_EQ(0, stream_id_);
DCHECK(!client_);
}
// static
PepperPlatformAudioOutputImpl* PepperPlatformAudioOutputImpl::Create(
int sample_rate,
int frames_per_buffer,
webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
scoped_refptr<PepperPlatformAudioOutputImpl> audio_output(
new PepperPlatformAudioOutputImpl);
if (audio_output->Initialize(sample_rate, frames_per_buffer, client)) {
// Balanced by Release invoked in
// PepperPlatformAudioOutputImpl::ShutDownOnIOThread().
return audio_output.release();
}
return NULL;
}
bool PepperPlatformAudioOutputImpl::StartPlayback() {
if (filter_) {
ChildProcess::current()->io_message_loop()->PostTask(
FROM_HERE,
base::Bind(&PepperPlatformAudioOutputImpl::StartPlaybackOnIOThread,
this));
return true;
}
return false;
}
bool PepperPlatformAudioOutputImpl::StopPlayback() {
if (filter_) {
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));
}
bool PepperPlatformAudioOutputImpl::Initialize(
int sample_rate,
int frames_per_buffer,
webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
DCHECK(client);
// Make sure we don't call init more than once.
DCHECK_EQ(0, stream_id_);
client_ = client;
AudioParameters::Format format;
const int kMaxFramesForLowLatency = 2048;
// 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.
if (sample_rate == audio_hardware::GetOutputSampleRate() &&
frames_per_buffer <= kMaxFramesForLowLatency &&
frames_per_buffer % audio_hardware::GetOutputBufferSize() == 0) {
format = AudioParameters::AUDIO_PCM_LOW_LATENCY;
} else {
format = AudioParameters::AUDIO_PCM_LINEAR;
}
AudioParameters params(format, 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 AudioParameters& params) {
stream_id_ = filter_->AddDelegate(this);
filter_->Send(new AudioHostMsg_CreateStream(stream_id_, params));
}
void PepperPlatformAudioOutputImpl::StartPlaybackOnIOThread() {
if (stream_id_)
filter_->Send(new AudioHostMsg_PlayStream(stream_id_));
}
void PepperPlatformAudioOutputImpl::StopPlaybackOnIOThread() {
if (stream_id_)
filter_->Send(new AudioHostMsg_PauseStream(stream_id_));
}
void PepperPlatformAudioOutputImpl::ShutDownOnIOThread() {
// Make sure we don't call shutdown more than once.
if (!stream_id_)
return;
filter_->Send(new AudioHostMsg_CloseStream(stream_id_));
filter_->RemoveDelegate(stream_id_);
stream_id_ = 0;
Release(); // Release for the delegate, balances out the reference taken in
// PepperPluginDelegateImpl::CreateAudio.
}
void PepperPlatformAudioOutputImpl::OnStateChanged(AudioStreamState state) {
}
void PepperPlatformAudioOutputImpl::OnStreamCreated(
base::SharedMemoryHandle handle,
base::SyncSocket::Handle socket_handle,
uint32 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));
}
}
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