Revert of Buffer 2 seconds of data in the ffmpeg demuxer.

media/filters/ffmpeg_demuxer.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/filters/ffmpeg_demuxer.h"
 
 #include <algorithm>
 #include <memory>
 #include <set>
 #include <utility>
@@ skipping 761 matching lines @@
     }
   }
 
   // Have capacity? Ask for more!
   if (HasAvailableCapacity() && !end_of_stream_) {
     demuxer_->NotifyCapacityAvailable();
   }
 }
 
 bool FFmpegDemuxerStream::HasAvailableCapacity() {
-  // Try to have two second's worth of encoded data per stream.
-  const base::TimeDelta kCapacity = base::TimeDelta::FromSeconds(2);
+  // TODO(scherkus): Remove this return and reenable time-based capacity
+  // after our data sources support canceling/concurrent reads, see
+  // http://crbug.com/165762 for details.
+#if 1
+  return !read_cb_.is_null();
+#else
+  // Try to have one second's worth of encoded data per stream.
+  const base::TimeDelta kCapacity = base::TimeDelta::FromSeconds(1);
   return buffer_queue_.IsEmpty() || buffer_queue_.Duration() < kCapacity;
+#endif
 }
 
 size_t FFmpegDemuxerStream::MemoryUsage() const {
   return buffer_queue_.data_size();
 }
 
 TextKind FFmpegDemuxerStream::GetTextKind() const {
   DCHECK_EQ(type_, DemuxerStream::TEXT);
 
   if (stream_->disposition & AV_DISPOSITION_CAPTIONS)
@@ skipping 1037 matching lines @@
 
 void FFmpegDemuxer::SetLiveness(DemuxerStream::Liveness liveness) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   for (const auto& stream : streams_) {
     if (stream)
       stream->SetLiveness(liveness);
   }
 }
 
 }  // namespace media