[Windows] Implementation of 'AudioDestinationNode.devicePosition' att…

…ribute

The newly added 'AudioDestinationNode.devicePosition' attribute
helps to bind audio context time and performance time values.

Please see for more details:
WebAudio/web-audio-api#754
WebAudio/web-audio-api#12

content/browser/renderer_host/media/audio_sync_reader.cc

@@ -107,7 +107,8 @@ AudioSyncReader::~AudioSyncReader() {
 
 // media::AudioOutputController::SyncReader implementations.
 void AudioSyncReader::UpdatePendingBytes(uint32_t bytes,
-                                         uint32_t frames_skipped) {
+                                         uint32_t frames_skipped,
+                                         const media::StreamPosition& device_position) {
   // Increase the number of skipped frames stored in shared memory. We don't
   // send it over the socket since sending more than 4 bytes might lead to being
   // descheduled. The reading side will zero it when consumed.
@@ -120,6 +121,7 @@ void AudioSyncReader::UpdatePendingBytes(uint32_t bytes,
   output_bus_->Zero();
 
   socket_->Send(&bytes, sizeof(bytes));
+  socket_->Send(&device_position, sizeof(device_position));
   ++buffer_index_;
 }
 

content/browser/renderer_host/media/audio_sync_reader.h

@@ -39,7 +39,10 @@ class AudioSyncReader : public media::AudioOutputController::SyncReader {
   ~AudioSyncReader() override;
 
   // media::AudioOutputController::SyncReader implementations.
-  void UpdatePendingBytes(uint32_t bytes, uint32_t frames_skipped) override;
+  void UpdatePendingBytes(
+      uint32_t bytes,
+      uint32_t frames_skipped,
+      const media::StreamPosition& position) override;
   void Read(media::AudioBus* dest) override;
   void Close() override;
 

content/renderer/media/renderer_webaudiodevice_impl.cc

@@ -102,7 +102,8 @@ double RendererWebAudioDeviceImpl::sampleRate() {
 
 int RendererWebAudioDeviceImpl::Render(media::AudioBus* dest,
                                        uint32_t frames_delayed,
-                                       uint32_t frames_skipped) {
+                                       uint32_t frames_skipped,
+                                       const media::StreamPosition& position) {
 #if defined(OS_ANDROID)
   if (is_first_buffer_after_silence_) {
     DCHECK(!is_using_null_audio_sink_);
@@ -120,9 +121,15 @@ int RendererWebAudioDeviceImpl::Render(media::AudioBus* dest,
   // TODO(xians): Remove the following |web_audio_source_data| after
   // changing the blink interface.
   WebVector<float*> web_audio_source_data(static_cast<size_t>(0));
+
+  double seconds = position.ticks
+      / static_cast<double>(base::Time::kMicrosecondsPerSecond);
+  StreamPosition device_position(static_cast<size_t>(position.frames),
+                                 seconds);
   client_callback_->render(web_audio_source_data,
                            web_audio_dest_data,
-                           dest->frames());
+                           dest->frames(),
+                           device_position);
 
 #if defined(OS_ANDROID)
   const bool is_zero = dest->AreFramesZero();

content/renderer/media/renderer_webaudiodevice_impl.h

@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
+#include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 #include "third_party/WebKit/public/platform/WebAudioDevice.h"
@@ -45,7 +46,8 @@ class RendererWebAudioDeviceImpl
   // AudioRendererSink::RenderCallback implementation.
   int Render(media::AudioBus* dest,
              uint32_t frames_delayed,
-             uint32_t frames_skipped) override;
+             uint32_t frames_skipped,
+             const media::StreamPosition& position) override;
 
   void OnRenderError() override;
 
@@ -89,6 +91,8 @@ class RendererWebAudioDeviceImpl
   // period of silence. We do this on android to save battery consumption.
   base::CancelableClosure start_null_audio_sink_callback_;
 
+  media::StreamPosition device_position_;
+
   // Security origin, used to check permissions for |output_device_|.
   url::Origin security_origin_;
 

media/audio/BUILD.gn

@@ -64,6 +64,7 @@ source_set("audio") {
     "audio_input_device.h",
     "audio_input_ipc.cc",
     "audio_input_ipc.h",
+    "audio_io.cc",
     "audio_io.h",
     "audio_manager.cc",
     "audio_manager.h",

media/audio/audio_device_thread.cc

@@ -175,6 +175,11 @@ void AudioDeviceThread::Thread::Run() {
     if (bytes_read != sizeof(pending_data))
       break;
 
+    StreamPosition device_position = { 0, 0 };
+    bytes_read = socket_.Receive(&device_position, sizeof(device_position));
+    if (bytes_read != sizeof(device_position))
+      break;
+
     // std::numeric_limits<uint32_t>::max() is a special signal which is
     // returned after the browser stops the output device in response to a
     // renderer side request.
@@ -186,7 +191,7 @@ void AudioDeviceThread::Thread::Run() {
     if (pending_data != std::numeric_limits<uint32_t>::max()) {
       base::AutoLock auto_lock(callback_lock_);
       if (callback_)
-        callback_->Process(pending_data);
+        callback_->Process(pending_data, device_position);
     }
 
     // The usage of |synchronized_buffers_| differs between input and output

media/audio/audio_device_thread.h

@@ -13,6 +13,7 @@
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
 #include "base/synchronization/lock.h"
+#include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_export.h"
 
@@ -22,6 +23,7 @@ class MessageLoop;
 
 namespace media {
 class AudioBus;
+struct StreamPosition;
 
 // Data transfer between browser and render process uses a combination
 // of sync sockets and shared memory. To read from the socket and render
@@ -53,7 +55,9 @@ class MEDIA_EXPORT AudioDeviceThread {
     virtual void MapSharedMemory() = 0;
 
     // Called whenever we receive notifications about pending input data.
-    virtual void Process(uint32_t pending_data) = 0;
+    virtual void Process(
+        uint32_t pending_data,
+        const StreamPosition& position) = 0;
 
    protected:
     // Protected so that derived classes can access directly.

media/audio/audio_input_device.cc

@@ -41,7 +41,7 @@ class AudioInputDevice::AudioThreadCallback
   void MapSharedMemory() override;
 
   // Called whenever we receive notifications about pending data.
-  void Process(uint32_t pending_data) override;
+  void Process(uint32_t pending_data, const StreamPosition& position) override;
 
  private:
   int current_segment_id_;
@@ -302,7 +302,9 @@ void AudioInputDevice::AudioThreadCallback::MapSharedMemory() {
   }
 }
 
-void AudioInputDevice::AudioThreadCallback::Process(uint32_t pending_data) {
+void AudioInputDevice::AudioThreadCallback::Process(
+    uint32_t pending_data,
+    const StreamPosition& position) {
   // The shared memory represents parameters, size of the data buffer and the
   // actual data buffer containing audio data. Map the memory into this
   // structure and parse out parameters and the data area.

media/audio/audio_io.cc

@@ -0,0 +1,24 @@
+// Copyright (c) 2016 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 "media/audio/audio_io.h"
+
+namespace media {
+
+int AudioOutputStream::AudioSourceCallback::OnMoreData(
+    AudioBus* dest,
+    uint32_t total_bytes_delay,
+    uint32_t frames_skipped) {
+  return 0;
+}
+
+int AudioOutputStream::AudioSourceCallback::OnMoreData(
+    AudioBus* dest,
+    uint32_t total_bytes_delay,
+    uint32_t frames_skipped,
+    const StreamPosition& device_position) {
+  return OnMoreData(dest, total_bytes_delay, frames_skipped);
+}
+
+}  // namespace media

media/audio/audio_io.h

@@ -49,6 +49,11 @@
 
 namespace media {
 
+struct MEDIA_EXPORT StreamPosition {
+  int64_t frames;
+  int64_t ticks;  // Obtained from base::TimeTicks::ToInternalValue().
+};
+
 class MEDIA_EXPORT AudioOutputStream {
  public:
   // Audio sources must implement AudioSourceCallback. This interface will be
@@ -65,7 +70,13 @@ class MEDIA_EXPORT AudioOutputStream {
     // |frames_skipped| contains the number of frames skipped by the consumer.
     virtual int OnMoreData(AudioBus* dest,
                            uint32_t total_bytes_delay,
-                           uint32_t frames_skipped) = 0;
+                           uint32_t frames_skipped);
+    // An alternate version which provides also device stream position,
+    // by default it just invokes the above method.
+    virtual int OnMoreData(AudioBus* dest,
+                           uint32_t total_bytes_delay,
+                           uint32_t frames_skipped,
+                           const StreamPosition& device_position);
 
     // There was an error while playing a buffer. Audio source cannot be
     // destroyed yet. No direct action needed by the AudioStream, but it is

media/audio/audio_output_controller.cc

@@ -285,7 +285,8 @@ void AudioOutputController::DoReportError() {
 
 int AudioOutputController::OnMoreData(AudioBus* dest,
                                       uint32_t total_bytes_delay,
-                                      uint32_t frames_skipped) {
+                                      uint32_t frames_skipped,
+                                      const StreamPosition& device_position) {
   TRACE_EVENT0("audio", "AudioOutputController::OnMoreData");
 
   // Indicate that we haven't wedged (at least not indefinitely, WedgeCheck()
@@ -299,7 +300,8 @@ int AudioOutputController::OnMoreData(AudioBus* dest,
 
   const int frames = dest->frames();
   sync_reader_->UpdatePendingBytes(
-      total_bytes_delay + frames * params_.GetBytesPerFrame(), frames_skipped);
+      total_bytes_delay + frames * params_.GetBytesPerFrame(), frames_skipped,
+      device_position);
 
   if (will_monitor_audio_levels())
     power_monitor_.Scan(*dest, frames);

media/audio/audio_output_controller.h

@@ -90,8 +90,10 @@ class MEDIA_EXPORT AudioOutputController
     // frames has been skipped by the renderer (typically the OS). The renderer
     // source can handle this appropriately depending on the type of source. An
     // ordinary file playout would ignore this.
-    virtual void UpdatePendingBytes(uint32_t bytes,
-                                    uint32_t frames_skipped) = 0;
+    virtual void UpdatePendingBytes(
+        uint32_t bytes,
+        uint32_t frames_skipped,
+        const StreamPosition& position = StreamPosition()) = 0;
 
     // Attempts to completely fill |dest|, zeroing |dest| if the request can not
     // be fulfilled (due to timeout).
@@ -163,7 +165,8 @@ class MEDIA_EXPORT AudioOutputController
   // AudioSourceCallback implementation.
   int OnMoreData(AudioBus* dest,
                  uint32_t total_bytes_delay,
-                 uint32_t frames_skipped) override;
+                 uint32_t frames_skipped,
+                 const StreamPosition& device_position) override;
   void OnError(AudioOutputStream* stream) override;
 
   // AudioDeviceListener implementation.  When called AudioOutputController will

media/audio/audio_output_device.cc

@@ -36,7 +36,7 @@ class AudioOutputDevice::AudioThreadCallback
   void MapSharedMemory() override;
 
   // Called whenever we receive notifications about pending data.
-  void Process(uint32_t pending_data) override;
+  void Process(uint32_t pending_data, const StreamPosition& position) override;
 
  private:
   AudioRendererSink::RenderCallback* render_callback_;
@@ -397,7 +397,9 @@ void AudioOutputDevice::AudioThreadCallback::MapSharedMemory() {
 }
 
 // Called whenever we receive notifications about pending data.
-void AudioOutputDevice::AudioThreadCallback::Process(uint32_t pending_data) {
+void AudioOutputDevice::AudioThreadCallback::Process(
+    uint32_t pending_data,
+    const StreamPosition& position) {
   // Convert the number of pending bytes in the render buffer into frames.
   double frames_delayed = static_cast<double>(pending_data) / bytes_per_frame_;
 
@@ -427,7 +429,7 @@ void AudioOutputDevice::AudioThreadCallback::Process(uint32_t pending_data) {
   // the shared memory the Render() call is writing directly into the shared
   // memory.
   render_callback_->Render(output_bus_.get(), std::round(frames_delayed),
-                           frames_skipped);
+                           frames_skipped, position);
 }
 
 }  // namespace media

media/audio/audio_output_resampler.cc

@@ -33,7 +33,8 @@ class OnMoreDataConverter
   // AudioSourceCallback interface.
   int OnMoreData(AudioBus* dest,
                  uint32_t total_bytes_delay,
-                 uint32_t frames_skipped) override;
+                 uint32_t frames_skipped,
+                 const StreamPosition& position) override;
   void OnError(AudioOutputStream* stream) override;
 
   // Sets |source_callback_|.  If this is not a new object, then Stop() must be
@@ -73,6 +74,9 @@ class OnMoreDataConverter
   // stream has been stopped.
   bool error_occurred_;
 
+  // Information about last recodred stream output position.
+  StreamPosition device_position_;
+
   DISALLOW_COPY_AND_ASSIGN(OnMoreDataConverter);
 };
 
@@ -349,7 +353,8 @@ OnMoreDataConverter::OnMoreDataConverter(const AudioParameters& input_params,
       source_callback_(nullptr),
       input_bytes_per_second_(input_params.GetBytesPerSecond()),
       audio_converter_(input_params, output_params, false),
-      error_occurred_(false) {}
+      error_occurred_(false),
+      device_position_() {}
 
 OnMoreDataConverter::~OnMoreDataConverter() {
   // Ensure Stop() has been called so we don't end up with an AudioOutputStream
@@ -376,7 +381,9 @@ void OnMoreDataConverter::Stop() {
 
 int OnMoreDataConverter::OnMoreData(AudioBus* dest,
                                     uint32_t total_bytes_delay,
-                                    uint32_t frames_skipped) {
+                                    uint32_t frames_skipped,
+                                    const StreamPosition& position) {
+  device_position_ = position;
   current_total_bytes_delay_ = total_bytes_delay;
   audio_converter_.Convert(dest);
 
@@ -395,8 +402,10 @@ double OnMoreDataConverter::ProvideInput(AudioBus* dest,
                    buffer_delay.InSecondsF() * input_bytes_per_second_));
 
   // Retrieve data from the original callback.
-  const int frames =
-      source_callback_->OnMoreData(dest, new_total_bytes_delay, 0);
+  const int frames = source_callback_->OnMoreData(dest,
+                                                  new_total_bytes_delay,
+                                                  0,
+                                                  device_position_);
 
   // Zero any unfilled frames if anything was filled, otherwise we'll just
   // return a volume of zero and let AudioConverter drop the output.

media/audio/win/audio_low_latency_output_win.cc

@@ -70,6 +70,7 @@ WASAPIAudioOutputStream::WASAPIAudioOutputStream(AudioManagerWin* manager,
       share_mode_(GetShareMode()),
       num_written_frames_(0),
       source_(NULL),
+      hns_units_to_perf_count_(0.0),
       audio_bus_(AudioBus::Create(params)) {
   DCHECK(manager_);
 
@@ -126,6 +127,14 @@ WASAPIAudioOutputStream::WASAPIAudioOutputStream(AudioManagerWin* manager,
   // Create the event which will be set in Stop() when capturing shall stop.
   stop_render_event_.Set(CreateEvent(NULL, FALSE, FALSE, NULL));
   DCHECK(stop_render_event_.IsValid());
+
+  LARGE_INTEGER performance_frequency;
+  if (QueryPerformanceFrequency(&performance_frequency)) {
+    hns_units_to_perf_count_ =
+        (static_cast<double>(performance_frequency.QuadPart) / 10000000.0);
+  } else {
+    DLOG(ERROR) << "High-resolution performance counters are not supported.";
+  }
 }
 
 WASAPIAudioOutputStream::~WASAPIAudioOutputStream() {
@@ -510,8 +519,11 @@ bool WASAPIAudioOutputStream::RenderAudioFromSource(UINT64 device_frequency) {
     // can typically be utilized by an acoustic echo-control (AEC)
     // unit at the render side.
     UINT64 position = 0;
+    UINT64 qpc_position = 0;
     uint32_t audio_delay_bytes = 0;
-    hr = audio_clock_->GetPosition(&position, NULL);
+    StreamPosition device_position = { 0, 0 };
+
+    hr = audio_clock_->GetPosition(&position, &qpc_position);
     if (SUCCEEDED(hr)) {
       // Stream position of the sample that is currently playing
       // through the speaker.
@@ -528,13 +540,22 @@ bool WASAPIAudioOutputStream::RenderAudioFromSource(UINT64 device_frequency) {
       // render client using the OnMoreData() callback.
       audio_delay_bytes = (pos_last_sample_written_frames -
           pos_sample_playing_frames) *  format_.Format.nBlockAlign;
+      if (hns_units_to_perf_count_) {
+        device_position.frames = pos_sample_playing_frames;
+        device_position.ticks = 
+            base::TimeTicks::FromQPCValue(
+                qpc_position * hns_units_to_perf_count_).ToInternalValue();
+      }
     }
 
     // Read a data packet from the registered client source and
     // deliver a delay estimate in the same callback to the client.
 
     int frames_filled =
-        source_->OnMoreData(audio_bus_.get(), audio_delay_bytes, 0);
+        source_->OnMoreData(audio_bus_.get(),
+                            audio_delay_bytes,
+                            0,
+                            device_position);
     uint32_t num_filled_bytes = frames_filled * format_.Format.nBlockAlign;
     DCHECK_LE(num_filled_bytes, packet_size_bytes_);