Interpolate media time for mojo rendering pipeline.

media/renderers/audio_renderer_impl.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/renderers/audio_renderer_impl.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <algorithm>
 #include <utility>
@@ skipping 159 matching lines @@
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   base::AutoLock auto_lock(lock_);
   DCHECK(!rendering_);
   DCHECK_EQ(state_, kFlushed);
 
   start_timestamp_ = time;
   ended_timestamp_ = kInfiniteDuration;
   last_render_time_ = stop_rendering_time_ = base::TimeTicks();
   first_packet_timestamp_ = kNoTimestamp;
-  last_media_timestamp_ = base::TimeDelta();
   audio_clock_.reset(new AudioClock(time, audio_parameters_.sample_rate()));
 }
 
 base::TimeDelta AudioRendererImpl::CurrentMediaTime() {
   base::AutoLock auto_lock(lock_);
 
   // Return the current time based on the known extents of the rendered audio
   // data plus an estimate based on the last time those values were calculated.
   base::TimeDelta current_media_time = audio_clock_->front_timestamp();
   if (!last_render_time_.is_null()) {
     current_media_time +=
         (tick_clock_->NowTicks() - last_render_time_) * playback_rate_;
     if (current_media_time > audio_clock_->back_timestamp())
       current_media_time = audio_clock_->back_timestamp();
   }
 
-  // Clamp current media time to the last reported value, this prevents higher
-  // level clients from seeing time go backwards based on inaccurate or spurious
-  // delay values reported to the AudioClock.
-  //
-  // It is expected that such events are transient and will be recovered as
-  // rendering continues over time.
-  if (current_media_time < last_media_timestamp_) {
-    DVLOG(2) << __func__ << ": " << last_media_timestamp_
-             << " (clamped), actual: " << current_media_time;
-    return last_media_timestamp_;
-  }
-
-  DVLOG(2) << __func__ << ": " << current_media_time;
-  last_media_timestamp_ = current_media_time;
   return current_media_time;
 }
 
 bool AudioRendererImpl::GetWallClockTimes(
     const std::vector<base::TimeDelta>& media_timestamps,
     std::vector<base::TimeTicks>* wall_clock_times) {
   base::AutoLock auto_lock(lock_);
   DCHECK(wall_clock_times->empty());
 
   // When playback is paused (rate is zero), assume a rate of 1.0.
@@ skipping 747 matching lines @@
   DCHECK_NE(buffering_state_, buffering_state);
   lock_.AssertAcquired();
   buffering_state_ = buffering_state;
 
   task_runner_->PostTask(
       FROM_HERE, base::Bind(&AudioRendererImpl::OnBufferingStateChange,
                             weak_factory_.GetWeakPtr(), buffering_state_));
 }
 
 }  // namespace media