Update media duration if data is appended after the previous duration

media/base/clock.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/base/clock.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "media/base/buffers.h"
@@ skipping 62 matching lines @@
 
   UpdateReferencePoints();
   max_time_ = ClampToValidTimeRange(max_time);
 
   underflow_ = media_time_ > max_time_;
   if (underflow_)
     media_time_ = max_time_;
 }
 
 void Clock::SetDuration(base::TimeDelta duration) {
-  DCHECK(duration_ == kNoTimestamp() || duration_ == kInfiniteDuration());
   DCHECK(duration > base::TimeDelta());
   duration_ = duration;
 }
 
 base::TimeDelta Clock::ElapsedViaProvidedTime(const base::Time& time) const {
   // TODO(scherkus): floating point badness scaling time by playback rate.
   int64 now_us = (time - reference_).InMicroseconds();
   now_us = static_cast<int64>(now_us * playback_rate_);
   return media_time_ + base::TimeDelta::FromMicroseconds(now_us);
 }
@@ skipping 39 matching lines @@
   playing_ = false;
   playback_rate_ = 1.0f;
   max_time_ = kNoTimestamp();
   duration_ = kNoTimestamp();
   media_time_ = base::TimeDelta();
   reference_ = base::Time();
   underflow_ = false;
 }
 
 }  // namespace media