Delete MediaCodecPlayer, it's time!

media/base/android/access_unit_queue.h

-// Copyright 2015 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_BASE_ANDROID_ACCESS_UNIT_QUEUE_H_
-#define MEDIA_BASE_ANDROID_ACCESS_UNIT_QUEUE_H_
-
-#include <stddef.h>
-
-#include <list>
-
-#include "base/macros.h"
-#include "base/synchronization/lock.h"
-#include "media/base/android/demuxer_stream_player_params.h"
-
-namespace media {
-
-// The queue of incoming data for MediaCodecDecoder.
-//
-// The data comes in the form of access units. Each access unit has a type.
-// If the type is |kConfigChanged| the access unit itself has no data, but
-// is accompanied with DemuxerConfigs.
-// The queue should be accessed on the Media thread that puts the incoming data
-// in and on the Decoder thread that gets the next access unit and eventually
-// removes it from the queue.
-class AccessUnitQueue {
- public:
-  // Information about the queue state and the access unit at the front.
-  struct Info {
-    // The unit at front. Null if the queue is empty. This pointer may be
-    // invalidated by the next Advance() or Flush() call and must be used
-    // before the caller calls these methods. The |front_unit| is owned by
-    // the queue itself - never delete it through this pointer.
-    const AccessUnit* front_unit;
-
-    // Configs for the front unit if it is |kConfigChanged|, null otherwise.
-    // The same validity rule applies: this pointer is only valid till the next
-    // Advance() or Flush() call, and |configs| is owned by the queue itself.
-    const DemuxerConfigs* configs;
-
-    // Number of access units in the queue.
-    int length;
-
-    // Number of access units in the queue excluding config units.
-    int data_length;
-
-    // Whether End Of Stream has been added to the queue. Cleared by Flush().
-    bool has_eos;
-
-    Info() : front_unit(nullptr), configs(nullptr), length(0), has_eos(false) {}
-  };
-
-  AccessUnitQueue();
-  ~AccessUnitQueue();
-
-  // Appends the incoming data to the queue.
-  void PushBack(const DemuxerData& frames);
-
-  // Advances the front position to next unit. Logically the preceding units
-  // do not exist, but they can be physically removed later.
-  void Advance();
-
-  // Clears the queue, resets the length to zero and clears EOS condition.
-  void Flush();
-
-  // Looks back for the first key frame starting from the current one (i.e.
-  // the look-back is inclusive of the current front position).
-  // If the key frame exists, sets the current access unit to it and returns
-  // true. Otherwise returns false.
-  bool RewindToLastKeyFrame();
-
-  // Returns the information about the queue.
-  // The result is invalidated by the following Advance() or Flush call.
-  // There must be only one |Info| consumer at a time.
-  Info GetInfo() const;
-
-  // For unit tests only. These methods are not thread safe.
-  size_t NumChunksForTesting() const { return chunks_.size(); }
-  void SetHistorySizeForTesting(size_t number_of_history_chunks);
-
- private:
-  // Returns the total number of access units (total_length) and the number of
-  // units excluding configiration change requests (data_length). The number is
-  // calculated between the current one and the end, incuding the current.
-  // Logically these are units that have not been consumed.
-  void GetUnconsumedAccessUnitLength(int* total_length, int* data_length) const;
-
-  // The queue of data chunks. It owns the chunks.
-  typedef std::list<DemuxerData*> DataChunkQueue;
-  DataChunkQueue chunks_;
-
-  // The chunk that contains the current access unit.
-  DataChunkQueue::iterator current_chunk_;
-
-  // Index of the current access unit within the current chunk.
-  size_t index_in_chunk_;
-
-  // Amount of chunks before the |current_chunk_| that's kept for history.
-  size_t history_chunks_amount_;
-
-  // Indicates that a unit with End Of Stream flag has been appended.
-  bool has_eos_;
-
-  // The lock protects all fields together.
-  mutable base::Lock lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(AccessUnitQueue);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BASE_ANDROID_ACCESS_UNIT_QUEUE_H_