media/filters/gpu_video_decoder.h

   1 // Copyright (c) 2012 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_GPU_VIDEO_DECODER_H_
   6 #define MEDIA_FILTERS_GPU_VIDEO_DECODER_H_
   7
   8 #include <list>
   9 #include <map>
  10 #include <set>
  11 #include <utility>
  12 #include <vector>
  13
  14 #include "base/memory/weak_ptr.h"
  15 #include "media/base/pipeline_status.h"
  16 #include "media/base/video_decoder.h"
  17 #include "media/video/video_decode_accelerator.h"
  18
  19 template <class T> class scoped_refptr;
  20
  21 namespace base {
  22 class SharedMemory;
  23 class SingleThreadTaskRunner;
  24 }
  25
  26 namespace media {
  27
  28 class DecoderBuffer;
  29 class GpuVideoAcceleratorFactories;
  30 class MediaLog;
  31
  32 // GPU-accelerated video decoder implementation.  Relies on
  33 // AcceleratedVideoDecoderMsg_Decode and friends.  Can be created on any thread
  34 // but must be accessed and destroyed on GpuVideoAcceleratorFactories's
  35 // GetMessageLoop().
  36 class MEDIA_EXPORT GpuVideoDecoder
  37     : public VideoDecoder,
  38       public VideoDecodeAccelerator::Client {
  39  public:
  40   explicit GpuVideoDecoder(
  41       const scoped_refptr<GpuVideoAcceleratorFactories>& factories);
  42
  43   // VideoDecoder implementation.
  44   std::string GetDisplayName() const override;
  45   void Initialize(const VideoDecoderConfig& config,
  46                   bool low_delay,
  47                   const PipelineStatusCB& status_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   bool NeedsBitstreamConversion() const override;
  53   bool CanReadWithoutStalling() const override;
  54   int GetMaxDecodeRequests() const override;
  55
  56   // VideoDecodeAccelerator::Client implementation.
  57   void ProvidePictureBuffers(uint32 count,
  58                              const gfx::Size& size,
  59                              uint32 texture_target) override;
  60   void DismissPictureBuffer(int32 id) override;
  61   void PictureReady(const media::Picture& picture) override;
  62   void NotifyEndOfBitstreamBuffer(int32 id) override;
  63   void NotifyFlushDone() override;
  64   void NotifyResetDone() override;
  65   void NotifyError(media::VideoDecodeAccelerator::Error error) override;
  66
  67   static const char kDecoderName[];
  68
  69  protected:
  70   ~GpuVideoDecoder() override;
  71
  72  private:
  73   enum State {
  74     kNormal,
  75     kDrainingDecoder,
  76     kDecoderDrained,
  77     kError
  78   };
  79
  80   // A shared memory segment and its allocated size.
  81   struct SHMBuffer {
  82     SHMBuffer(scoped_ptr<base::SharedMemory> m, size_t s);
  83     ~SHMBuffer();
  84     scoped_ptr<base::SharedMemory> shm;
  85     size_t size;
  86   };
  87
  88   // A SHMBuffer and the DecoderBuffer its data came from.
  89   struct PendingDecoderBuffer {
  90     PendingDecoderBuffer(SHMBuffer* s,
  91                         const scoped_refptr<DecoderBuffer>& b,
  92                         const DecodeCB& done_cb);
  93     ~PendingDecoderBuffer();
  94     SHMBuffer* shm_buffer;
  95     scoped_refptr<DecoderBuffer> buffer;
  96     DecodeCB done_cb;
  97   };
  98
  99   typedef std::map<int32, PictureBuffer> PictureBufferMap;
 100
 101   void DeliverFrame(const scoped_refptr<VideoFrame>& frame);
 102
 103   // Static method is to allow it to run even after GVD is deleted.
 104   static void ReleaseMailbox(
 105       base::WeakPtr<GpuVideoDecoder> decoder,
 106       const scoped_refptr<media::GpuVideoAcceleratorFactories>& factories,
 107       int64 picture_buffer_id,
 108       uint32 texture_id,
 109       uint32 release_sync_point);
 110   // Indicate the picture buffer can be reused by the decoder.
 111   void ReusePictureBuffer(int64 picture_buffer_id);
 112
 113   void RecordBufferData(
 114       const BitstreamBuffer& bitstream_buffer, const DecoderBuffer& buffer);
 115   void GetBufferData(int32 id, base::TimeDelta* timetamp,
 116                      gfx::Rect* visible_rect, gfx::Size* natural_size);
 117
 118   void DestroyVDA();
 119
 120   // Request a shared-memory segment of at least |min_size| bytes.  Will
 121   // allocate as necessary.
 122   scoped_ptr<SHMBuffer> GetSHM(size_t min_size);
 123
 124   // Return a shared-memory segment to the available pool.
 125   void PutSHM(scoped_ptr<SHMBuffer> shm_buffer);
 126
 127   // Destroy all PictureBuffers in |buffers|, and delete their textures.
 128   void DestroyPictureBuffers(PictureBufferMap* buffers);
 129
 130   // Assert the contract that this class is operated on the right thread.
 131   void DCheckGpuVideoAcceleratorFactoriesTaskRunnerIsCurrent() const;
 132
 133   bool needs_bitstream_conversion_;
 134
 135   scoped_refptr<GpuVideoAcceleratorFactories> factories_;
 136
 137   // Populated during Initialize() (on success) and unchanged until an error
 138   // occurs.
 139   scoped_ptr<VideoDecodeAccelerator> vda_;
 140
 141   OutputCB output_cb_;
 142
 143   DecodeCB eos_decode_cb_;
 144
 145   // Not null only during reset.
 146   base::Closure pending_reset_cb_;
 147
 148   State state_;
 149
 150   VideoDecoderConfig config_;
 151
 152   // Shared-memory buffer pool.  Since allocating SHM segments requires a
 153   // round-trip to the browser process, we keep allocation out of the
 154   // steady-state of the decoder.
 155   std::vector<SHMBuffer*> available_shm_segments_;
 156
 157   std::map<int32, PendingDecoderBuffer> bitstream_buffers_in_decoder_;
 158   PictureBufferMap assigned_picture_buffers_;
 159   // PictureBuffers given to us by VDA via PictureReady, which we sent forward
 160   // as VideoFrames to be rendered via decode_cb_, and which will be returned
 161   // to us via ReusePictureBuffer.
 162   typedef std::map<int32 /* picture_buffer_id */, uint32 /* texture_id */>
 163       PictureBufferTextureMap;
 164   PictureBufferTextureMap picture_buffers_at_display_;
 165
 166   // The texture target used for decoded pictures.
 167   uint32 decoder_texture_target_;
 168
 169   struct BufferData {
 170     BufferData(int32 bbid, base::TimeDelta ts, const gfx::Rect& visible_rect,
 171                const gfx::Size& natural_size);
 172     ~BufferData();
 173     int32 bitstream_buffer_id;
 174     base::TimeDelta timestamp;
 175     gfx::Rect visible_rect;
 176     gfx::Size natural_size;
 177   };
 178   std::list<BufferData> input_buffer_data_;
 179
 180   // picture_buffer_id and the frame wrapping the corresponding Picture, for
 181   // frames that have been decoded but haven't been requested by a Decode() yet.
 182   int32 next_picture_buffer_id_;
 183   int32 next_bitstream_buffer_id_;
 184
 185   // Set during ProvidePictureBuffers(), used for checking and implementing
 186   // HasAvailableOutputFrames().
 187   int available_pictures_;
 188
 189   // Bound to factories_->GetMessageLoop().
 190   // NOTE: Weak pointers must be invalidated before all other member variables.
 191   base::WeakPtrFactory<GpuVideoDecoder> weak_factory_;
 192
 193   DISALLOW_COPY_AND_ASSIGN(GpuVideoDecoder);
 194 };
 195
 196 }  // namespace media
 197
 198 #endif  // MEDIA_FILTERS_GPU_VIDEO_DECODER_H_