text: //----------------------------------------------------------------------------
  //
  // TSDuck - The MPEG Transport Stream Toolkit
  // Copyright (c) 2005-2018, Thierry Lelegard
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  //
  // 1. Redistributions of source code must retain the above copyright notice,
  //    this list of conditions and the following disclaimer.
  // 2. Redistributions in binary form must reproduce the above copyright
  //    notice, this list of conditions and the following disclaimer in the
  //    documentation and/or other materials provided with the distribution.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  // THE POSSIBILITY OF SUCH DAMAGE.
  //
  //----------------------------------------------------------------------------
  
  #pragma once
  
  
  //----------------------------------------------------------------------------
  // Static method to compute the minimum number of TS packets required to
  // transport a set of sections.
  //----------------------------------------------------------------------------
  
  template <class CONTAINER>
  ts::PacketCounter ts::Section::PacketCount(const CONTAINER& container, bool pack)
  {
      PacketCounter pkt_count = 0;
  
      if (pack) {
          // Simulate packetization of each section.
          size_t remain_in_pkt = 184; // remaining bytes in current TS packet payload.
          bool has_pf = false;        // current TS packet has a pointer field.
  
          for (typename CONTAINER::const_iterator it = container.begin(); it != container.end(); ++it) {
              const SectionPtr& sec(*it);
              if (!sec.isNull() && sec->isValid()) {
  
                  // Total section size.
                  size_t size = sec->size();
                  assert(size > 0);
  
                  // Need a pointer field in currrent packet if there is none yet.
                  size_t pf_size = has_pf ? 0 : 1;
  
                  // Need this minimum size in current packet (we don't split a section header).
                  if (remain_in_pkt < pf_size + sec->headerSize())  {
                      // Not enough space in current packet, stuff it and move to next one.
                      remain_in_pkt = 184;
                      has_pf = false;
                      pf_size = 1;
                  }
  
                  // If current packet not started (not counted), need to start one.
                  if (remain_in_pkt == 184) {
                      pkt_count++;
                  }
  
                  // Total size to add, starting in the middle of current packet.
                  size += pf_size;
  
                  // Does the packet have a pointer field now?
                  has_pf = has_pf || pf_size > 0;
  
                  // Now simulate the packetization of the section.
                  if (size <= remain_in_pkt) {
                      // The section fits in current packet.
                      remain_in_pkt -= size;
                  }
                  else {
                      // Fill current packet and overflow in subsequent packets.
                      size -= remain_in_pkt;
                      pkt_count += (size + 183) / 184;
                      has_pf = 0;
                      remain_in_pkt = 184 - size % 184;
                  }
              }
          }
      }
      else {
          // Stuff end of sections. Each section use its own TS packets.
          for (typename CONTAINER::const_iterator it = container.begin(); it != container.end(); ++it) {
              const SectionPtr& sec(*it);
              if (!sec.isNull() && sec->isValid()) {
                  pkt_count += sec->packetCount();
              }
          }
      }
  
      return pkt_count;
  }
  