Implementation of 'AudioContext.getOutputTimestamp' method

media/audio/audio_output_controller.cc

 // 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 "media/audio/audio_output_controller.h"
 
 #include <stdint.h>
 
 #include <limits>
 
@@ skipping 155 matching lines @@
 void AudioOutputController::DoPlay() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioOutputController.PlayTime");
   TRACE_EVENT0("audio", "AudioOutputController::DoPlay");
 
   // We can start from created or paused state.
   if (state_ != kCreated && state_ != kPaused)
     return;
 
   // Ask for first packet.
-  sync_reader_->UpdatePendingBytes(0, 0);
+  sync_reader_->UpdatePendingBytes(0, 0, AudioTimestamp());
 
   state_ = kPlaying;
 
   stream_->Start(this);
 
   // For UMA tracking purposes, start the wedge detection timer.  This allows us
   // to record statistics about the number of wedged playbacks in the field.
   //
   // WedgeCheck() will look to see if |on_more_io_data_called_| is true after
   // the timeout expires.  Care must be taken to ensure the wedge check delay is
@@ skipping 32 matching lines @@
   TRACE_EVENT0("audio", "AudioOutputController::DoPause");
 
   StopStream();
 
   if (state_ != kPaused)
     return;
 
   // Let the renderer know we've stopped.  Necessary to let PPAPI clients know
   // audio has been shutdown.  TODO(dalecurtis): This stinks.  PPAPI should have
   // a better way to know when it should exit PPB_Audio_Shared::Run().
-  sync_reader_->UpdatePendingBytes(std::numeric_limits<uint32_t>::max(), 0);
+  sync_reader_->UpdatePendingBytes(std::numeric_limits<uint32_t>::max(), 0,
+                                   AudioTimestamp());
 
   handler_->OnPaused();
 }
 
 void AudioOutputController::DoClose() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioOutputController.CloseTime");
   TRACE_EVENT0("audio", "AudioOutputController::DoClose");
 
   if (state_ != kClosed) {
@@ skipping 47 matching lines @@
 }
 
 void AudioOutputController::DoReportError() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   if (state_ != kClosed)
     handler_->OnError();
 }
 
 int AudioOutputController::OnMoreData(AudioBus* dest,
                                       uint32_t total_bytes_delay,
-                                      uint32_t frames_skipped) {
+                                      uint32_t frames_skipped,
+                                      const AudioTimestamp& output_timestamp) {
   TRACE_EVENT0("audio", "AudioOutputController::OnMoreData");
 
   // Indicate that we haven't wedged (at least not indefinitely, WedgeCheck()
   // may have already fired if OnMoreData() took an abnormal amount of time).
   // Since this thread is the only writer of |on_more_io_data_called_| once the
   // thread starts, its safe to compare and then increment.
   if (base::AtomicRefCountIsZero(&on_more_io_data_called_))
     base::AtomicRefCountInc(&on_more_io_data_called_);
 
   sync_reader_->Read(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,
+      output_timestamp);
 
   bool need_to_duplicate = false;
   {
     base::AutoLock lock(duplication_targets_lock_);
     need_to_duplicate = !duplication_targets_.empty();
   }
   if (need_to_duplicate) {
     const base::TimeTicks reference_time =
         base::TimeTicks::Now() +
         base::TimeDelta::FromMicroseconds(base::Time::kMicrosecondsPerSecond *
@@ skipping 183 matching lines @@
   DCHECK(message_loop_->BelongsToCurrentThread());
 
   // If we should be playing and we haven't, that's a wedge.
   if (state_ == kPlaying) {
     UMA_HISTOGRAM_BOOLEAN("Media.AudioOutputControllerPlaybackStartupSuccess",
                           base::AtomicRefCountIsOne(&on_more_io_data_called_));
   }
 }
 
 }  // namespace media