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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 "ppapi/shared_impl/ppb_audio_shared.h"
#include "base/logging.h"
#include "ppapi/shared_impl/ppapi_globals.h"
using base::subtle::Atomic32;
namespace ppapi {
#if defined(OS_NACL)
namespace {
// Because this is static, the function pointers will be NULL initially.
PP_ThreadFunctions thread_functions;
}
#endif // defined(OS_NACL)
// FIXME: The following two functions (TotalSharedMemorySizeInBytes,
// SetActualDataSizeInBytes) are copied from audio_util.cc.
// Remove these functions once a minimal media library is provided for them.
// code.google.com/p/chromium/issues/detail?id=123203
uint32 TotalSharedMemorySizeInBytes(uint32 packet_size) {
// Need to reserve extra 4 bytes for size of data.
return packet_size + sizeof(Atomic32);
}
void SetActualDataSizeInBytes(base::SharedMemory* shared_memory,
uint32 shared_memory_size,
uint32 actual_data_size) {
char* ptr = static_cast<char*>(shared_memory->memory()) + shared_memory_size;
DCHECK_EQ(0u, reinterpret_cast<size_t>(ptr) & 3);
// Set actual data size at the end of the buffer.
base::subtle::Release_Store(reinterpret_cast<volatile Atomic32*>(ptr),
actual_data_size);
}
const int PPB_Audio_Shared::kPauseMark = -1;
PPB_Audio_Shared::PPB_Audio_Shared()
: playing_(false),
shared_memory_size_(0),
#if defined(OS_NACL)
thread_id_(0),
thread_active_(false),
#endif
callback_(NULL),
user_data_(NULL) {
}
PPB_Audio_Shared::~PPB_Audio_Shared() {
StopThread();
}
void PPB_Audio_Shared::SetCallback(PPB_Audio_Callback callback,
void* user_data) {
callback_ = callback;
user_data_ = user_data;
}
void PPB_Audio_Shared::SetStartPlaybackState() {
DCHECK(!playing_);
#if !defined(OS_NACL)
DCHECK(!audio_thread_.get());
#else
DCHECK(!thread_active_);
#endif
// 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.
playing_ = true;
StartThread();
}
void PPB_Audio_Shared::SetStopPlaybackState() {
DCHECK(playing_);
StopThread();
playing_ = false;
}
void PPB_Audio_Shared::SetStreamInfo(
PP_Instance instance,
base::SharedMemoryHandle shared_memory_handle,
size_t shared_memory_size,
base::SyncSocket::Handle socket_handle) {
socket_.reset(new base::CancelableSyncSocket(socket_handle));
shared_memory_.reset(new base::SharedMemory(shared_memory_handle, false));
shared_memory_size_ = shared_memory_size;
if (!shared_memory_->Map(TotalSharedMemorySizeInBytes(shared_memory_size_))) {
PpapiGlobals::Get()->LogWithSource(instance, PP_LOGLEVEL_WARNING, "",
"Failed to map shared memory for PPB_Audio_Shared.");
}
StartThread();
}
void PPB_Audio_Shared::StartThread() {
// Don't start the thread unless all our state is set up correctly.
if (!playing_ || !callback_ || !socket_.get() || !shared_memory_->memory())
return;
// Clear contents of shm buffer before starting audio thread. This will
// prevent a burst of static if for some reason the audio thread doesn't
// start up quickly enough.
memset(shared_memory_->memory(), 0, shared_memory_size_);
#if !defined(OS_NACL)
DCHECK(!audio_thread_.get());
audio_thread_.reset(new base::DelegateSimpleThread(
this, "plugin_audio_thread"));
audio_thread_->Start();
#else
// Use NaCl's special API for IRT code that creates threads that call back
// into user code.
if (NULL == thread_functions.thread_create ||
NULL == thread_functions.thread_join)
return;
int result = thread_functions.thread_create(&thread_id_, CallRun, this);
DCHECK_EQ(result, 0);
thread_active_ = true;
#endif
}
void PPB_Audio_Shared::StopThread() {
// Shut down the socket to escape any hanging |Receive|s.
if (socket_.get())
socket_->Shutdown();
#if !defined(OS_NACL)
if (audio_thread_.get()) {
audio_thread_->Join();
audio_thread_.reset();
}
#else
if (thread_active_) {
int result = thread_functions.thread_join(thread_id_);
DCHECK_EQ(0, result);
thread_active_ = false;
}
#endif
}
#if defined(OS_NACL)
// static
void PPB_Audio_Shared::SetThreadFunctions(
const struct PP_ThreadFunctions* functions) {
DCHECK(thread_functions.thread_create == NULL);
DCHECK(thread_functions.thread_join == NULL);
thread_functions = *functions;
}
// static
void PPB_Audio_Shared::CallRun(void* self) {
PPB_Audio_Shared* audio = static_cast<PPB_Audio_Shared*>(self);
audio->Run();
}
#endif
void PPB_Audio_Shared::Run() {
int pending_data;
void* buffer = shared_memory_->memory();
while (sizeof(pending_data) ==
socket_->Receive(&pending_data, sizeof(pending_data)) &&
pending_data != kPauseMark) {
callback_(buffer, shared_memory_size_, user_data_);
// Let the host know we are done.
SetActualDataSizeInBytes(shared_memory_.get(), shared_memory_size_,
shared_memory_size_);
}
}
} // namespace ppapi
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