media/filters/fake_video_decoder.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_FILTERS_FAKE_VIDEO_DECODER_H_
   6 #define MEDIA_FILTERS_FAKE_VIDEO_DECODER_H_
   7
   8 #include <list>
   9
  10 #include "base/bind.h"
  11 #include "base/callback.h"
  12 #include "base/callback_helpers.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "base/threading/thread_checker.h"
  15 #include "media/base/callback_holder.h"
  16 #include "media/base/decoder_buffer.h"
  17 #include "media/base/pipeline_status.h"
  18 #include "media/base/video_decoder.h"
  19 #include "media/base/video_decoder_config.h"
  20 #include "media/base/video_frame.h"
  21 #include "ui/gfx/geometry/size.h"
  22
  23 using base::ResetAndReturn;
  24
  25 namespace base {
  26 class SingleThreadTaskRunner;
  27 }
  28
  29 namespace media {
  30
  31 typedef base::Callback<void(int)> BytesDecodedCB;
  32
  33 class FakeVideoDecoder : public VideoDecoder {
  34  public:
  35   // Constructs an object with a decoding delay of |decoding_delay| frames.
  36   // |bytes_decoded_cb| is called after each decode. The sum of the byte
  37   // count over all calls will be equal to total_bytes_decoded().
  38   FakeVideoDecoder(int decoding_delay,
  39                    int max_parallel_decoding_requests,
  40                    const BytesDecodedCB& bytes_decoded_cb);
  41   ~FakeVideoDecoder() override;
  42
  43   // VideoDecoder implementation.
  44   std::string GetDisplayName() const override;
  45   void Initialize(const VideoDecoderConfig& config,
  46                   bool low_delay,
  47                   const InitCB& init_cb,
  48                   const OutputCB& output_cb) override;
  49   void Decode(const scoped_refptr<DecoderBuffer>& buffer,
  50               const DecodeCB& decode_cb) override;
  51   void Reset(const base::Closure& closure) override;
  52   int GetMaxDecodeRequests() const override;
  53
  54   // Holds the next init/decode/reset callback from firing.
  55   void HoldNextInit();
  56   void HoldDecode();
  57   void HoldNextReset();
  58
  59   // Satisfies the pending init/decode/reset callback, which must be ready to
  60   // fire when these methods are called.
  61   void SatisfyInit();
  62   void SatisfyDecode();
  63   void SatisfyReset();
  64
  65   // Satisfies single  decode request.
  66   void SatisfySingleDecode();
  67
  68   void SimulateError();
  69   // Fail with status DECODER_ERROR_NOT_SUPPORTED when Initialize() is called.
  70   void SimulateFailureToInit();
  71
  72   int total_bytes_decoded() const { return total_bytes_decoded_; }
  73
  74  private:
  75   enum State {
  76     STATE_UNINITIALIZED,
  77     STATE_NORMAL,
  78     STATE_END_OF_STREAM,
  79     STATE_ERROR,
  80   };
  81
  82   // Callback for updating |total_bytes_decoded_|.
  83   void OnFrameDecoded(int buffer_size,
  84                       const DecodeCB& decode_cb,
  85                       Status status);
  86
  87   // Runs |decode_cb| or puts it to |held_decode_callbacks_| depending on
  88   // current value of |hold_decode_|.
  89   void RunOrHoldDecode(const DecodeCB& decode_cb);
  90
  91   // Runs |decode_cb| with a frame from |decoded_frames_|.
  92   void RunDecodeCallback(const DecodeCB& decode_cb);
  93
  94   void DoReset();
  95
  96   base::ThreadChecker thread_checker_;
  97
  98   const size_t decoding_delay_;
  99   const int max_parallel_decoding_requests_;
 100   BytesDecodedCB bytes_decoded_cb_;
 101
 102   State state_;
 103
 104   CallbackHolder<InitCB> init_cb_;
 105   CallbackHolder<base::Closure> reset_cb_;
 106
 107   OutputCB output_cb_;
 108
 109   bool hold_decode_;
 110   std::list<DecodeCB> held_decode_callbacks_;
 111
 112   VideoDecoderConfig current_config_;
 113
 114   std::list<scoped_refptr<VideoFrame> > decoded_frames_;
 115
 116   int total_bytes_decoded_;
 117
 118   bool fail_to_initialize_;
 119
 120   // NOTE: Weak pointers must be invalidated before all other member variables.
 121   base::WeakPtrFactory<FakeVideoDecoder> weak_factory_;
 122
 123   DISALLOW_COPY_AND_ASSIGN(FakeVideoDecoder);
 124 };
 125
 126 }  // namespace media
 127
 128 #endif  // MEDIA_FILTERS_FAKE_VIDEO_DECODER_H_