media/video/h264_poc.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 MEDIA_VIDEO_H264_POC_H_
   6 #define MEDIA_VIDEO_H264_POC_H_
   7
   8 namespace media {
   9
  10 struct H264SPS;
  11 struct H264SliceHeader;
  12
  13 class MEDIA_EXPORT H264POC {
  14  public:
  15   H264POC();
  16   ~H264POC();
  17
  18   // Compute the picture order count for a slice, storing the result into
  19   // |*pic_order_cnt|.
  20   bool ComputePicOrderCnt(
  21       const H264SPS* sps,
  22       const H264SliceHeader& slice_hdr,
  23       int32_t* pic_order_cnt);
  24
  25   // Reset computation state. It's best (although not strictly required) to call
  26   // this after a seek.
  27   void Reset();
  28
  29  private:
  30   int32_t ref_pic_order_cnt_msb_;
  31   int32_t ref_pic_order_cnt_lsb_;
  32   int32_t prev_frame_num_;
  33   int32_t prev_frame_num_offset_;
  34
  35   DISALLOW_COPY_AND_ASSIGN(H264POC);
  36 };
  37
  38 }  // namespace media
  39
  40 #endif  // MEDIA_VIDEO_H264_POC_H_