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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 <stddef.h>
#include <stdint.h>
#include <memory>
#include "base/macros.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/sync_socket.h"
#include "base/threading/simple_thread.h"
#include "media/base/audio_bus.h"
#include "ppapi/c/ppb_audio.h"
#include "ppapi/c/ppb_audio_config.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/thunk/ppb_audio_api.h"
struct PP_ThreadFunctions;
namespace ppapi {
class PPAPI_SHARED_EXPORT AudioCallbackCombined {
explicit AudioCallbackCombined(PPB_Audio_Callback_1_0 callback_1_0);
explicit AudioCallbackCombined(PPB_Audio_Callback callback);
bool IsValid() const;
void Run(void* sample_buffer,
uint32_t buffer_size_in_bytes,
PP_TimeDelta latency,
void* user_data) const;
PPB_Audio_Callback_1_0 callback_1_0_;
PPB_Audio_Callback callback_;
// Implements the logic to map shared memory and run the audio thread signaled
// from the sync socket. Both the proxy and the renderer implementation use
// this code.
: public thunk::PPB_Audio_API,
public base::DelegateSimpleThread::Delegate {
virtual ~PPB_Audio_Shared();
bool playing() const { return playing_; }
// Sets the callback information that the background thread will use. This
// is optional. Without a callback, the thread will not be run. This
// non-callback mode is used in the renderer with the proxy, since the proxy
// handles the callback entirely within the plugin process.
void SetCallback(const AudioCallbackCombined& callback, void* user_data);
// Configures the current state to be playing or not. The caller is
// responsible for ensuring the new state is the opposite of the current one.
// This is the implementation for PPB_Audio.Start/StopPlayback, except that
// it does not actually notify the audio system to stop playback, it just
// configures our object to stop generating callbacks. The actual stop
// playback request will be done in the derived classes and will be different
// from the proxy and the renderer.
void SetStartPlaybackState();
void SetStopPlaybackState();
// Sets the shared memory and socket handles. This will automatically start
// playback if we're currently set to play.
void SetStreamInfo(PP_Instance instance,
base::UnsafeSharedMemoryRegion shared_memory_region,
base::SyncSocket::Handle socket_handle,
PP_AudioSampleRate sample_rate,
int sample_frame_count);
// Returns whether a thread can be created on the client context.
// In trusted plugin, this should always return true, as it uses Chrome's
// thread library. In NaCl plugin, this returns whether SetThreadFunctions
// was invoked properly.
static bool IsThreadFunctionReady();
// Configures this class to run in a NaCl plugin.
// If called, SetThreadFunctions() must be called before calling
// SetStartPlaybackState() on any instance of this class.
static void SetNaClMode();
// NaCl has a special API for IRT code to create threads that can call back
// into user code.
static void SetThreadFunctions(const struct PP_ThreadFunctions* functions);
// Starts execution of the audio thread.
void StartThread();
// Stop execution of the audio thread.
void StopThread();
// DelegateSimpleThread::Delegate implementation. Run on the audio thread.
virtual void Run();
// True if playing the stream.
bool playing_;
// Socket used to notify us when audio is ready to accept new samples. This
// pointer is created in StreamCreated().
std::unique_ptr<base::CancelableSyncSocket> socket_;
// Sample buffer in shared memory. This pointer is created in
// StreamCreated(). The memory is only mapped when the audio thread is
// created.
base::WritableSharedMemoryMapping shared_memory_;
// The size of the sample buffer in bytes.
size_t shared_memory_size_;
// When the callback is set, this thread is spawned for calling it.
std::unique_ptr<base::DelegateSimpleThread> audio_thread_;
uintptr_t nacl_thread_id_;
bool nacl_thread_active_;
static void CallRun(void* self);
// Callback to call when audio is ready to accept new samples.
AudioCallbackCombined callback_;
// User data pointer passed verbatim to the callback function.
void* user_data_;
// AudioBus for shuttling data across the shared memory.
std::unique_ptr<media::AudioBus> audio_bus_;
// Internal buffer for client's integer audio data.
int client_buffer_size_bytes_;
std::unique_ptr<uint8_t[]> client_buffer_;
// The size (in bytes) of one second of audio data. Used to calculate latency.
size_t bytes_per_second_;
// Buffer index used to coordinate with the browser side audio receiver.
uint32_t buffer_index_;
} // namespace ppapi