chromecast/public/media/media_pipeline_device_params.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_PUBLIC_MEDIA_MEDIA_PIPELINE_DEVICE_PARAMS_H_
   6 #define CHROMECAST_PUBLIC_MEDIA_MEDIA_PIPELINE_DEVICE_PARAMS_H_
   7
   8 #include "task_runner.h"
   9
  10 namespace chromecast {
  11 namespace media {
  12
  13 // Supplies creation parameters to platform-specific pipeline backend.
  14 struct MediaPipelineDeviceParams {
  15   enum MediaSyncType {
  16     // Default operation, synchronize playback using PTS with higher latency.
  17     kModeSyncPts = 0,
  18     // With this mode, synchronization is disabled and audio/video frames are
  19     // rendered "right away":
  20     // - for audio, frames are still rendered based on the sampling frequency
  21     // - for video, frames are rendered as soon as available at the output of
  22     //   the video decoder.
  23     //   The assumption is that no B frames are used when synchronization is
  24     //   disabled, otherwise B frames would always be skipped.
  25     kModeIgnorePts = 1,
  26     // In addition to the constraints above, also do not wait for vsync.
  27     kModeIgnorePtsAndVSync = 2,
  28   };
  29
  30   MediaPipelineDeviceParams(TaskRunner* task_runner_in)
  31       : sync_type(kModeSyncPts), task_runner(task_runner_in) {}
  32
  33   MediaPipelineDeviceParams(MediaSyncType sync_type_in,
  34                             TaskRunner* task_runner_in)
  35       : sync_type(sync_type_in), task_runner(task_runner_in) {}
  36
  37   const MediaSyncType sync_type;
  38
  39   // task_runner allows backend implementations to post tasks to the media
  40   // thread.  Since all calls from cast_shell into the backend are made on
  41   // the media thread, this may simplify thread management and safety for
  42   // some backends.
  43   TaskRunner* const task_runner;
  44 };
  45
  46 }  // namespace media
  47 }  // namespace chromecast
  48
  49 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_PARAMS_H_