Allow multiple concurrent Decode() requests in VideoDecoder interface.

media/filters/decoder_stream.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_FILTERS_DECODER_STREAM_H_
 #define MEDIA_FILTERS_DECODER_STREAM_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 69 matching lines @@
   // it is stopped. This method can be called at any time but not during another
   // pending Stop().
   void Stop(const base::Closure& closure);
 
   // Returns true if the decoder currently has the ability to decode and return
   // an Output.
   // TODO(rileya): Remove the need for this by refactoring Decoder queueing
   // behavior.
   bool CanReadWithoutStalling() const;
 
+  // Returns true if one more decode request can be submitted to the decoder.
+  bool CanDecodeAnotherBuffer() const;
+
   // Allows callers to register for notification of splice buffers from the
   // demuxer.  I.e., DecoderBuffer::splice_timestamp() is not kNoTimestamp().
   typedef base::Callback<void(base::TimeDelta)> SpliceObserverCB;
   void set_splice_observer(const SpliceObserverCB& splice_observer) {
     splice_observer_cb_ = splice_observer;
   }
 
   // Allows callers to register for notification of config changes; this is
   // called immediately after recieving the 'kConfigChanged' status from the
   // DemuxerStream, before any action is taken to handle the config change.
@@ skipping 73 matching lines @@
 
   scoped_ptr<DecoderSelector<StreamType> > decoder_selector_;
 
   // These two will be set by DecoderSelector::SelectDecoder().
   scoped_ptr<Decoder> decoder_;
   scoped_ptr<DecryptingDemuxerStream> decrypting_demuxer_stream_;
 
   SpliceObserverCB splice_observer_cb_;
   ConfigChangeObserverCB config_change_observer_cb_;
 
+  // Decoded buffers that haven't been read yet. Used when the decode supports

[Ami GONE FROM CHROMIUM, 2014/04/16 01:00:00]

decode -> decoder

[Sergey Ulanov, 2014/04/16 01:44:14]

Done.

+  // parallel decoding.
+  std::list<scoped_refptr<Output> > ready_output_buffers_;
+  int pending_decode_requests_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<DecoderStream<StreamType> > weak_factory_;
 
   // This is required so the VideoFrameStream can access private members in
   // FinishInitialization() and ReportStatistics().
   DISALLOW_IMPLICIT_CONSTRUCTORS(DecoderStream);
 };
 
 template <>
 bool DecoderStream<DemuxerStream::AUDIO>::CanReadWithoutStalling() const;
 
+template <>
+bool DecoderStream<DemuxerStream::AUDIO>::CanDecodeAnotherBuffer() const;
+
 typedef DecoderStream<DemuxerStream::VIDEO> VideoFrameStream;
 typedef DecoderStream<DemuxerStream::AUDIO> AudioBufferStream;
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_DECODER_STREAM_H_