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// Copyright (c) 2010 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 "ppapi/shared_impl/audio_impl.h"
#include "base/logging.h"
namespace pp {
namespace shared_impl {
AudioImpl::AudioImpl()
: playing_(false),
shared_memory_size_(0),
callback_(NULL),
user_data_(NULL) {
}
AudioImpl::~AudioImpl() {
// Closing the socket causes the thread to exit - wait for it.
if (socket_.get())
socket_->Close();
if (audio_thread_.get()) {
audio_thread_->Join();
audio_thread_.reset();
}
}
void AudioImpl::SetCallback(PPB_Audio_Callback callback, void* user_data) {
callback_ = callback;
user_data_ = user_data;
}
void AudioImpl::SetStartPlaybackState() {
DCHECK(!playing_);
DCHECK(!audio_thread_.get());
// If the socket doesn't exist, that means that the plugin has started before
// the browser has had a chance to create all the shared memory info and
// notify us. This is a common case. In this case, we just set the playing_
// flag and the playback will automatically start when that data is available
// in SetStreamInfo.
if (callback_ && socket_.get())
StartThread();
playing_ = true;
}
void AudioImpl::SetStopPlaybackState() {
DCHECK(playing_);
if (audio_thread_.get()) {
audio_thread_->Join();
audio_thread_.reset();
}
playing_ = false;
}
void AudioImpl::SetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
size_t shared_memory_size,
base::SyncSocket::Handle socket_handle) {
socket_.reset(new base::SyncSocket(socket_handle));
shared_memory_.reset(new base::SharedMemory(shared_memory_handle, false));
shared_memory_size_ = shared_memory_size;
if (callback_) {
shared_memory_->Map(shared_memory_size_);
// In common case StartPlayback() was called before StreamCreated().
if (playing_)
StartThread();
}
}
void AudioImpl::StartThread() {
DCHECK(callback_);
DCHECK(!audio_thread_.get());
audio_thread_.reset(new base::DelegateSimpleThread(
this, "plugin_audio_thread"));
audio_thread_->Start();
}
void AudioImpl::Run() {
int pending_data;
void* buffer = shared_memory_->memory();
while (sizeof(pending_data) ==
socket_->Receive(&pending_data, sizeof(pending_data)) &&
pending_data >= 0) {
// Exit the thread on pause.
if (pending_data < 0)
return;
callback_(buffer, shared_memory_size_, user_data_);
}
}
} // namespace shared_impl
} // namespace pp
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