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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 {
// 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),
callback_(NULL),
user_data_(NULL) {
}
PPB_Audio_Shared::~PPB_Audio_Shared() {
// 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 PPB_Audio_Shared::SetCallback(PPB_Audio_Callback callback,
void* user_data) {
callback_ = callback;
user_data_ = user_data;
}
void PPB_Audio_Shared::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.
playing_ = true;
StartThread();
}
void PPB_Audio_Shared::SetStopPlaybackState() {
DCHECK(playing_);
if (audio_thread_.get()) {
audio_thread_->Join();
audio_thread_.reset();
}
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::SyncSocket(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;
DCHECK(!audio_thread_.get());
audio_thread_.reset(new base::DelegateSimpleThread(
this, "plugin_audio_thread"));
audio_thread_->Start();
}
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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