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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/media/audio_device_thread.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/threading/platform_thread.h"
#include "base/threading/thread_restrictions.h"
#include "media/audio/audio_util.h"
using base::PlatformThread;
// The actual worker thread implementation. It's very bare bones and much
// simpler than SimpleThread (no synchronization in Start, etc) and supports
// joining the thread handle asynchronously via a provided message loop even
// after the Thread object itself has been deleted.
class AudioDeviceThread::Thread
: public PlatformThread::Delegate,
public base::RefCountedThreadSafe<AudioDeviceThread::Thread> {
public:
Thread(AudioDeviceThread::Callback* callback,
base::SyncSocket::Handle socket,
const char* thread_name);
void Start();
// Stops the thread. If |loop_for_join| is non-NULL, the function posts
// a task to join (close) the thread handle later instead of waiting for
// the thread. If loop_for_join is NULL, then the function waits
// synchronously for the thread to terminate.
void Stop(MessageLoop* loop_for_join);
private:
friend class base::RefCountedThreadSafe<AudioDeviceThread::Thread>;
virtual ~Thread();
// Overrides from PlatformThread::Delegate.
virtual void ThreadMain() OVERRIDE;
// Runs the loop that reads from the socket.
void Run();
private:
base::PlatformThreadHandle thread_;
AudioDeviceThread::Callback* callback_;
base::CancelableSyncSocket socket_;
base::Lock callback_lock_;
const char* thread_name_;
DISALLOW_COPY_AND_ASSIGN(Thread);
};
// AudioDeviceThread implementation
AudioDeviceThread::AudioDeviceThread() {
}
AudioDeviceThread::~AudioDeviceThread() {
DCHECK(!thread_);
}
void AudioDeviceThread::Start(AudioDeviceThread::Callback* callback,
base::SyncSocket::Handle socket,
const char* thread_name) {
base::AutoLock auto_lock(thread_lock_);
CHECK(thread_ == NULL);
thread_ = new AudioDeviceThread::Thread(callback, socket, thread_name);
thread_->Start();
}
void AudioDeviceThread::Stop(MessageLoop* loop_for_join) {
base::AutoLock auto_lock(thread_lock_);
if (thread_) {
thread_->Stop(loop_for_join);
thread_ = NULL;
}
}
bool AudioDeviceThread::IsStopped() {
base::AutoLock auto_lock(thread_lock_);
return thread_ == NULL;
}
// AudioDeviceThread::Thread implementation
AudioDeviceThread::Thread::Thread(AudioDeviceThread::Callback* callback,
base::SyncSocket::Handle socket,
const char* thread_name)
: thread_(base::kNullThreadHandle),
callback_(callback),
socket_(socket),
thread_name_(thread_name) {
}
AudioDeviceThread::Thread::~Thread() {
DCHECK_EQ(thread_, base::kNullThreadHandle) << "Stop wasn't called";
}
void AudioDeviceThread::Thread::Start() {
base::AutoLock auto_lock(callback_lock_);
DCHECK_EQ(thread_, base::kNullThreadHandle);
// This reference will be released when the thread exists.
AddRef();
PlatformThread::Create(0, this, &thread_);
CHECK(thread_ != base::kNullThreadHandle);
}
void AudioDeviceThread::Thread::Stop(MessageLoop* loop_for_join) {
socket_.Shutdown();
base::PlatformThreadHandle thread = base::kNullThreadHandle;
{ // NOLINT
base::AutoLock auto_lock(callback_lock_);
callback_ = NULL;
std::swap(thread, thread_);
}
if (thread != base::kNullThreadHandle) {
if (loop_for_join) {
loop_for_join->PostTask(FROM_HERE,
base::Bind(&base::PlatformThread::Join, thread));
} else {
base::PlatformThread::Join(thread);
}
}
}
void AudioDeviceThread::Thread::ThreadMain() {
PlatformThread::SetName(thread_name_);
// Singleton access is safe from this thread as long as callback is non-NULL.
// The callback is the only point where the thread calls out to 'unknown' code
// that might touch singletons and the lifetime of the callback is controlled
// by another thread on which singleton access is OK as well.
base::ThreadRestrictions::SetSingletonAllowed(true);
PlatformThread::SetThreadPriority(thread_,
base::kThreadPriority_RealtimeAudio);
{ // NOLINT
base::AutoLock auto_lock(callback_lock_);
if (callback_)
callback_->InitializeOnAudioThread();
}
Run();
// Release the reference for the thread. Note that after this, the Thread
// instance will most likely be deleted.
Release();
}
void AudioDeviceThread::Thread::Run() {
while (true) {
int pending_data = 0;
size_t bytes_read = socket_.Receive(&pending_data, sizeof(pending_data));
if (bytes_read != sizeof(pending_data)) {
DCHECK_EQ(bytes_read, 0U);
break;
}
base::AutoLock auto_lock(callback_lock_);
if (callback_)
callback_->Process(pending_data);
}
}
// AudioDeviceThread::Callback implementation
AudioDeviceThread::Callback::Callback(
const media::AudioParameters& audio_parameters,
base::SharedMemoryHandle memory, int memory_length)
: audio_parameters_(audio_parameters),
samples_per_ms_(audio_parameters.sample_rate() / 1000),
bytes_per_ms_(audio_parameters.channels() *
(audio_parameters_.bits_per_sample() / 8) *
samples_per_ms_),
shared_memory_(memory, false),
memory_length_(memory_length) {
}
AudioDeviceThread::Callback::~Callback() {
for (size_t i = 0; i < audio_data_.size(); ++i)
delete [] audio_data_[i];
}
void AudioDeviceThread::Callback::InitializeOnAudioThread() {
DCHECK(audio_data_.empty());
MapSharedMemory();
DCHECK(shared_memory_.memory() != NULL);
audio_data_.reserve(audio_parameters_.channels());
for (int i = 0; i < audio_parameters_.channels(); ++i) {
float* channel_data = new float[audio_parameters_.frames_per_buffer()];
audio_data_.push_back(channel_data);
}
}
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