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      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 <algorithm>
      6 
      7 #include "base/logging.h"
      8 #include "base/stl_util.h"
      9 #include "content/common/gpu/media/h264_dpb.h"
     10 
     11 namespace content {
     12 
     13 H264DPB::H264DPB() : max_num_pics_(0) {}
     14 H264DPB::~H264DPB() {}
     15 
     16 void H264DPB::Clear() {
     17   pics_.clear();
     18 }
     19 
     20 void H264DPB::set_max_num_pics(size_t max_num_pics) {
     21   DCHECK_LE(max_num_pics, kDPBMaxSize);
     22   max_num_pics_ = max_num_pics;
     23   if (pics_.size() > max_num_pics_)
     24     pics_.resize(max_num_pics_);
     25 }
     26 
     27 void H264DPB::DeleteByPOC(int poc) {
     28   for (Pictures::iterator it = pics_.begin(); it != pics_.end(); ++it) {
     29     if ((*it)->pic_order_cnt == poc) {
     30       pics_.erase(it);
     31       return;
     32     }
     33   }
     34   NOTREACHED() << "Missing POC: " << poc;
     35 }
     36 
     37 void H264DPB::DeleteUnused() {
     38   for (Pictures::iterator it = pics_.begin(); it != pics_.end(); ) {
     39     if ((*it)->outputted && !(*it)->ref)
     40       it = pics_.erase(it);
     41     else
     42       ++it;
     43   }
     44 }
     45 
     46 void H264DPB::StorePic(H264Picture* pic) {
     47   DCHECK_LT(pics_.size(), max_num_pics_);
     48   DVLOG(3) << "Adding PicNum: " << pic->pic_num << " ref: " << (int)pic->ref
     49            << " longterm: " << (int)pic->long_term << " to DPB";
     50   pics_.push_back(pic);
     51 }
     52 
     53 int H264DPB::CountRefPics() {
     54   int ret = 0;
     55   for (size_t i = 0; i < pics_.size(); ++i) {
     56     if (pics_[i]->ref)
     57       ++ret;
     58   }
     59   return ret;
     60 }
     61 
     62 void H264DPB::MarkAllUnusedForRef() {
     63   for (size_t i = 0; i < pics_.size(); ++i)
     64     pics_[i]->ref = false;
     65 }
     66 
     67 H264Picture* H264DPB::GetShortRefPicByPicNum(int pic_num) {
     68   for (size_t i = 0; i < pics_.size(); ++i) {
     69     H264Picture* pic = pics_[i];
     70     if (pic->ref && !pic->long_term && pic->pic_num == pic_num)
     71       return pic;
     72   }
     73 
     74   DVLOG(1) << "Missing short ref pic num: " << pic_num;
     75   return NULL;
     76 }
     77 
     78 H264Picture* H264DPB::GetLongRefPicByLongTermPicNum(int pic_num) {
     79   for (size_t i = 0; i < pics_.size(); ++i) {
     80     H264Picture* pic = pics_[i];
     81     if (pic->ref && pic->long_term && pic->long_term_pic_num == pic_num)
     82       return pic;
     83   }
     84 
     85   DVLOG(1) << "Missing long term pic num: " << pic_num;
     86   return NULL;
     87 }
     88 
     89 H264Picture* H264DPB::GetLowestFrameNumWrapShortRefPic() {
     90   H264Picture* ret = NULL;
     91   for (size_t i = 0; i < pics_.size(); ++i) {
     92     H264Picture* pic = pics_[i];
     93     if (pic->ref && !pic->long_term &&
     94         (!ret || pic->frame_num_wrap < ret->frame_num_wrap))
     95       ret = pic;
     96   }
     97   return ret;
     98 }
     99 
    100 void H264DPB::GetNotOutputtedPicsAppending(H264Picture::PtrVector& out) {
    101   for (size_t i = 0; i < pics_.size(); ++i) {
    102     H264Picture* pic = pics_[i];
    103     if (!pic->outputted)
    104       out.push_back(pic);
    105   }
    106 }
    107 
    108 void H264DPB::GetShortTermRefPicsAppending(H264Picture::PtrVector& out) {
    109   for (size_t i = 0; i < pics_.size(); ++i) {
    110     H264Picture* pic = pics_[i];
    111     if (pic->ref && !pic->long_term)
    112       out.push_back(pic);
    113   }
    114 }
    115 
    116 void H264DPB::GetLongTermRefPicsAppending(H264Picture::PtrVector& out) {
    117   for (size_t i = 0; i < pics_.size(); ++i) {
    118     H264Picture* pic = pics_[i];
    119     if (pic->ref && pic->long_term)
    120       out.push_back(pic);
    121   }
    122 }
    123 
    124 }  // namespace content
    125