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 media {
  17 class VideoDecoderConfig;
  18 }
  19
  20 namespace chromecast {
  21 namespace media {
  22 class DecoderBufferBase;
  23
  24 // VideoPipelineDevice -
  25 //
  26 // Notes:
  27 // - Like a regular MediaComponentDevice, frames are possibly rendered only
  28 //   in the kRunning state.
  29 //   However, the first frame must be rendered regardless of the clock state:
  30 //   - no synchronization needed to display the first frame,
  31 //   - the clock rate has no impact on the presentation of the first frame.
  32 //
  33 class VideoPipelineDevice : public MediaComponentDevice {
  34  public:
  35   struct VideoClient {
  36     VideoClient();
  37     ~VideoClient();
  38
  39     // Invoked each time the natural size is updated.
  40     base::Callback<void(const gfx::Size& natural_size)>
  41         natural_size_changed_cb;
  42   };
  43
  44   VideoPipelineDevice();
  45   ~VideoPipelineDevice() override;
  46
  47   // Registers |client| as the video specific event handler.
  48   virtual void SetVideoClient(const VideoClient& client) = 0;
  49
  50   // Provide the video configuration.
  51   // Must be called before switching from |kStateUninitialized| to |kStateIdle|.
  52   // Afterwards, this can be invoked any time the configuration changes.
  53   // Returns true if the configuration is a supported configuration.
  54   virtual bool SetConfig(const ::media::VideoDecoderConfig& config) = 0;
  55
  56  private:
  57   DISALLOW_COPY_AND_ASSIGN(VideoPipelineDevice);
  58 };
  59
  60 }  // namespace media
  61 }  // namespace chromecast
  62
  63 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PIPELINE_DEVICE_H_