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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_VIDEO_H264_POC_H_
#define MEDIA_VIDEO_H264_POC_H_
#include <stdint.h>
#include "base/macros.h"
namespace media {
struct H264SPS;
struct H264SliceHeader;
// Returns the picture order count for a slice.
base::Optional<int32_t> ComputePicOrderCnt(const H264SPS* sps,
const H264SliceHeader& slice_hdr);
// As specified, the POC of a frame with MMCO5 changes (to zero) after
// decoding. We instead return 0 immediately, and flag that this has occurred
// by returning true here until ComputePicOrderCnt() is called again.
// Frames with MMCO5 do not reorder relative to frames earlier in decode
// order, but may reorder relative to frames later in decode order (just like
// IDRs).
bool IsPendingMMCO5() { return pending_mmco5_; }
// Reset computation state. It's best (although not strictly required) to call
// this after a seek.
void Reset();
int32_t ref_pic_order_cnt_msb_;
int32_t ref_pic_order_cnt_lsb_;
int32_t prev_frame_num_;
int32_t prev_frame_num_offset_;
bool pending_mmco5_;
} // namespace media
#endif // MEDIA_VIDEO_H264_POC_H_