text: ﻿/*
   * MIT License
   *
   * Copyright (c) 2016-2019 xiongziliang <771730766@qq.com>
   *
   * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  
  #include "H264.h"
  #include "SPSParser.h"
  #include "Util/logger.h"
  using namespace toolkit;
  
  namespace mediakit{
  
  bool getAVCInfo(const char * sps,int sps_len,int &iVideoWidth, int &iVideoHeight, float  &iVideoFps){
      T_GetBitContext tGetBitBuf;
      T_SPS tH264SpsInfo;
      memset(&tGetBitBuf,0,sizeof(tGetBitBuf));
      memset(&tH264SpsInfo,0,sizeof(tH264SpsInfo));
      tGetBitBuf.pu8Buf = (uint8_t*)sps + 1;
      tGetBitBuf.iBufSize = sps_len - 1;
      if(0 != h264DecSeqParameterSet((void *) &tGetBitBuf, &tH264SpsInfo)){
          return false;
      }
      h264GetWidthHeight(&tH264SpsInfo, &iVideoWidth, &iVideoHeight);
      h264GeFramerate(&tH264SpsInfo, &iVideoFps);
      //ErrorL << iVideoWidth << " " << iVideoHeight << " " << iVideoFps;
      return true;
  }
  
  bool getAVCInfo(const string& strSps,int &iVideoWidth, int &iVideoHeight, float  &iVideoFps) {
      return getAVCInfo(strSps.data(),strSps.size(),iVideoWidth,iVideoHeight,iVideoFps);
  }
  
  const char *memfind(const char *buf, int len, const char *subbuf, int sublen) {
      for (auto i = 0; i < len - sublen; ++i) {
          if (memcmp(buf + i, subbuf, sublen) == 0) {
              return buf + i;
          }
      }
      return NULL;
  }
  
  void splitH264(const char *ptr, int len, const std::function<void(const char *, int)> &cb) {
      auto nal = ptr;
      auto end = ptr + len;
      while(true) {
          auto next_nal = memfind(nal + 3,end - nal - 3,"\x0\x0\x1",3);
          if(next_nal){
              cb(nal,next_nal - nal);
              nal = next_nal;
              continue;
          }
          cb(nal,end - nal);
          break;
      }
  }
  
  
  Sdp::Ptr H264Track::getSdp() {
      if(!ready()){
          WarnL << "H264 Track未准备好";
          return nullptr;
      }
      return std::make_shared<H264Sdp>(getSps(),getPps());
  }
  }//namespace mediakit
  
  
  