Resume from time-zero on streaming resources.

media/blink/webmediaplayer_impl.cc

 // Copyright 2013 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/blink/webmediaplayer_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <string>
@@ skipping 1232 matching lines @@
     if (pending_seek_) {
       seek_time_ = pending_seek_time_;
       pending_seek_ = false;
       pending_seek_time_ = base::TimeDelta();
     }
     time_changed = true;
   } else {
     // It is safe to call GetCurrentFrameTimestamp() because VFC is stopped
     // during Suspend(). It won't be started again until after Resume() is
     // called.  Use the pipeline time if there's no video.
-    seek_time_ = hasVideo() ? compositor_->GetCurrentFrameTimestamp()
-                            : pipeline_.GetMediaTime();
+    if (!data_source_ || !data_source_->IsStreaming()) {
+      seek_time_ = hasVideo() ? compositor_->GetCurrentFrameTimestamp()
+                              : pipeline_.GetMediaTime();
+    } else {
+      // Resume from zero if a resource does not support range requests; this
+      // avoids a painful "read-the-whole-file" seek penalty.
+      seek_time_ = base::TimeDelta();
+    }
   }
 
   if (chunk_demuxer_)
     chunk_demuxer_->StartWaitingForSeek(seek_time_);
 
   resuming_ = true;
   pipeline_.Resume(CreateRenderer(), seek_time_,
                    BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnPipelineSeeked,
                                         time_changed));
 }
@@ skipping 350 matching lines @@
            << ", Video: " << stats.video_memory_usage << ", DataSource: "
            << (data_source_ ? data_source_->GetMemoryUsage() : 0)
            << ", Demuxer: " << demuxer_memory_usage;
 
   const int64_t delta = current_memory_usage - last_reported_memory_usage_;
   last_reported_memory_usage_ = current_memory_usage;
   adjust_allocated_memory_cb_.Run(delta);
 }
 
 }  // namespace media