1 // Copyright (c) 2012 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 #include <string.h>
6
7 #include <algorithm>
8
9 #include "base/logging.h"
10 #include "base/stl_util.h"
11 #include "h264_dpb.h"
12
13 namespace media {
14
H264Picture()15 H264Picture::H264Picture()
16 : pic_order_cnt_type(0),
17 top_field_order_cnt(0),
18 bottom_field_order_cnt(0),
19 pic_order_cnt(0),
20 pic_order_cnt_msb(0),
21 pic_order_cnt_lsb(0),
22 delta_pic_order_cnt_bottom(0),
23 delta_pic_order_cnt0(0),
24 delta_pic_order_cnt1(0),
25 pic_num(0),
26 long_term_pic_num(0),
27 frame_num(0),
28 frame_num_offset(0),
29 frame_num_wrap(0),
30 long_term_frame_idx(0),
31 type(H264SliceHeader::kPSlice),
32 nal_ref_idc(0),
33 idr(false),
34 idr_pic_id(0),
35 ref(false),
36 long_term(false),
37 outputted(false),
38 mem_mgmt_5(false),
39 nonexisting(false),
40 field(FIELD_NONE),
41 long_term_reference_flag(false),
42 adaptive_ref_pic_marking_mode_flag(false),
43 dpb_position(0) {
44 memset(&ref_pic_marking, 0, sizeof(ref_pic_marking));
45 }
46
~H264Picture()47 H264Picture::~H264Picture() {}
48
AsV4L2H264Picture()49 V4L2H264Picture* H264Picture::AsV4L2H264Picture() {
50 return nullptr;
51 }
52
H264DPB()53 H264DPB::H264DPB() : max_num_pics_(0) {}
~H264DPB()54 H264DPB::~H264DPB() {}
55
Clear()56 void H264DPB::Clear() {
57 pics_.clear();
58 }
59
set_max_num_pics(size_t max_num_pics)60 void H264DPB::set_max_num_pics(size_t max_num_pics) {
61 DCHECK_LE(max_num_pics, static_cast<size_t>(kDPBMaxSize));
62 max_num_pics_ = max_num_pics;
63 if (pics_.size() > max_num_pics_)
64 pics_.resize(max_num_pics_);
65 }
66
UpdatePicPositions()67 void H264DPB::UpdatePicPositions() {
68 size_t i = 0;
69 for (auto& pic : pics_) {
70 pic->dpb_position = i;
71 ++i;
72 }
73 }
74
DeleteByPOC(int poc)75 void H264DPB::DeleteByPOC(int poc) {
76 for (H264Picture::Vector::iterator it = pics_.begin(); it != pics_.end();
77 ++it) {
78 if ((*it)->pic_order_cnt == poc) {
79 pics_.erase(it);
80 UpdatePicPositions();
81 return;
82 }
83 }
84 NOTREACHED() << "Missing POC: " << poc;
85 }
86
DeleteUnused()87 void H264DPB::DeleteUnused() {
88 for (H264Picture::Vector::iterator it = pics_.begin(); it != pics_.end();) {
89 if ((*it)->outputted && !(*it)->ref)
90 it = pics_.erase(it);
91 else
92 ++it;
93 }
94 UpdatePicPositions();
95 }
96
StorePic(const scoped_refptr<H264Picture> & pic)97 void H264DPB::StorePic(const scoped_refptr<H264Picture>& pic) {
98 DCHECK_LT(pics_.size(), max_num_pics_);
99 DVLOG(3) << "Adding PicNum: " << pic->pic_num << " ref: " << (int)pic->ref
100 << " longterm: " << (int)pic->long_term << " to DPB";
101 pic->dpb_position = pics_.size();
102 pics_.push_back(pic);
103 }
104
CountRefPics()105 int H264DPB::CountRefPics() {
106 int ret = 0;
107 for (size_t i = 0; i < pics_.size(); ++i) {
108 if (pics_[i]->ref)
109 ++ret;
110 }
111 return ret;
112 }
113
MarkAllUnusedForRef()114 void H264DPB::MarkAllUnusedForRef() {
115 for (size_t i = 0; i < pics_.size(); ++i)
116 pics_[i]->ref = false;
117 }
118
GetShortRefPicByPicNum(int pic_num)119 scoped_refptr<H264Picture> H264DPB::GetShortRefPicByPicNum(int pic_num) {
120 for (const auto& pic : pics_) {
121 if (pic->ref && !pic->long_term && pic->pic_num == pic_num)
122 return pic;
123 }
124
125 DVLOG(1) << "Missing short ref pic num: " << pic_num;
126 return nullptr;
127 }
128
GetLongRefPicByLongTermPicNum(int pic_num)129 scoped_refptr<H264Picture> H264DPB::GetLongRefPicByLongTermPicNum(int pic_num) {
130 for (const auto& pic : pics_) {
131 if (pic->ref && pic->long_term && pic->long_term_pic_num == pic_num)
132 return pic;
133 }
134
135 DVLOG(1) << "Missing long term pic num: " << pic_num;
136 return nullptr;
137 }
138
GetLowestFrameNumWrapShortRefPic()139 scoped_refptr<H264Picture> H264DPB::GetLowestFrameNumWrapShortRefPic() {
140 scoped_refptr<H264Picture> ret;
141 for (const auto& pic : pics_) {
142 if (pic->ref && !pic->long_term &&
143 (!ret || pic->frame_num_wrap < ret->frame_num_wrap))
144 ret = pic;
145 }
146 return ret;
147 }
148
GetNotOutputtedPicsAppending(H264Picture::Vector * out)149 void H264DPB::GetNotOutputtedPicsAppending(H264Picture::Vector* out) {
150 for (const auto& pic : pics_) {
151 if (!pic->outputted)
152 out->push_back(pic);
153 }
154 }
155
GetShortTermRefPicsAppending(H264Picture::Vector * out)156 void H264DPB::GetShortTermRefPicsAppending(H264Picture::Vector* out) {
157 for (const auto& pic : pics_) {
158 if (pic->ref && !pic->long_term)
159 out->push_back(pic);
160 }
161 }
162
GetLongTermRefPicsAppending(H264Picture::Vector * out)163 void H264DPB::GetLongTermRefPicsAppending(H264Picture::Vector* out) {
164 for (const auto& pic : pics_) {
165 if (pic->ref && pic->long_term)
166 out->push_back(pic);
167 }
168 }
169
170 } // namespace media
171