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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <algorithm>
#include "base/cxx17_backports.h"
#include "base/logging.h"
#include "media/video/h265_parser.h"
#include "media/video/h265_poc.h"
namespace media {
H265POC::H265POC() {
Reset();
}
H265POC::~H265POC() = default;
void H265POC::Reset() {
ref_pic_order_cnt_msb_ = 0;
ref_pic_order_cnt_lsb_ = 0;
first_picture_ = true;
}
int32_t H265POC::ComputePicOrderCnt(const H265SPS* sps,
const H265PPS* pps,
const H265SliceHeader& slice_hdr) {
int32_t pic_order_cnt = 0;
int32_t max_pic_order_cnt_lsb =
1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
int32_t pic_order_cnt_msb;
int32_t no_rasl_output_flag;
// Calculate POC for current picture.
if (slice_hdr.irap_pic) {
// 8.1.3
no_rasl_output_flag = (slice_hdr.nal_unit_type >= H265NALU::BLA_W_LP &&
slice_hdr.nal_unit_type <= H265NALU::IDR_N_LP) ||
first_picture_;
} else {
no_rasl_output_flag = false;
}
if (!slice_hdr.irap_pic || !no_rasl_output_flag) {
int32_t prev_pic_order_cnt_lsb = ref_pic_order_cnt_lsb_;
int32_t prev_pic_order_cnt_msb = ref_pic_order_cnt_msb_;
if ((slice_hdr.slice_pic_order_cnt_lsb < prev_pic_order_cnt_lsb) &&
((prev_pic_order_cnt_lsb - slice_hdr.slice_pic_order_cnt_lsb) >=
(max_pic_order_cnt_lsb / 2))) {
pic_order_cnt_msb = prev_pic_order_cnt_msb + max_pic_order_cnt_lsb;
} else if ((slice_hdr.slice_pic_order_cnt_lsb > prev_pic_order_cnt_lsb) &&
((slice_hdr.slice_pic_order_cnt_lsb - prev_pic_order_cnt_lsb) >
(max_pic_order_cnt_lsb / 2))) {
pic_order_cnt_msb = prev_pic_order_cnt_msb - max_pic_order_cnt_lsb;
} else {
pic_order_cnt_msb = prev_pic_order_cnt_msb;
}
} else {
pic_order_cnt_msb = 0;
}
// 8.3.1 Decoding process for picture order count.
if (!pps->temporal_id && (slice_hdr.nal_unit_type < H265NALU::RADL_N ||
slice_hdr.nal_unit_type > H265NALU::RSV_VCL_N14)) {
ref_pic_order_cnt_lsb_ = slice_hdr.slice_pic_order_cnt_lsb;
ref_pic_order_cnt_msb_ = pic_order_cnt_msb;
}
pic_order_cnt = pic_order_cnt_msb + slice_hdr.slice_pic_order_cnt_lsb;
first_picture_ = false;
return pic_order_cnt;
}
} // namespace media
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