chromecast/media/cma/backend/video_pipeline_device.h

   1 // Copyright 2014 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 CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PIPELINE_DEVICE_H_
   6 #define CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PIPELINE_DEVICE_H_
   7
   8 #include "base/callback.h"
   9 #include "base/macros.h"
  10 #include "chromecast/media/cma/backend/media_component_device.h"
  11
  12 namespace gfx {
  13 class Size;
  14 }
  15
  16 namespace chromecast {
  17 namespace media {
  18 class DecoderBufferBase;
  19 struct VideoConfig;
  20
  21 // VideoPipelineDevice -
  22 //
  23 // Notes:
  24 // - Like a regular MediaComponentDevice, frames are possibly rendered only
  25 //   in the kRunning state.
  26 //   However, the first frame must be rendered regardless of the clock state:
  27 //   - no synchronization needed to display the first frame,
  28 //   - the clock rate has no impact on the presentation of the first frame.
  29 //
  30 class VideoPipelineDevice : public MediaComponentDevice {
  31  public:
  32   struct VideoClient {
  33     VideoClient();
  34     ~VideoClient();
  35
  36     // Invoked each time the natural size is updated.
  37     base::Callback<void(const gfx::Size& natural_size)>
  38         natural_size_changed_cb;
  39   };
  40
  41   VideoPipelineDevice();
  42   ~VideoPipelineDevice() override;
  43
  44   // Registers |client| as the video specific event handler.
  45   virtual void SetVideoClient(const VideoClient& client) = 0;
  46
  47   // Provide the video configuration.
  48   // Must be called before switching from |kStateUninitialized| to |kStateIdle|.
  49   // Afterwards, this can be invoked any time the configuration changes.
  50   // Returns true if the configuration is a supported configuration.
  51   virtual bool SetConfig(const VideoConfig& config) = 0;
  52
  53  private:
  54   DISALLOW_COPY_AND_ASSIGN(VideoPipelineDevice);
  55 };
  56
  57 }  // namespace media
  58 }  // namespace chromecast
  59
  60 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PIPELINE_DEVICE_H_