#if defined(HAVE_NESTED_ROUTINES)

                if (outputenglish && packetid >= MPID_VIDEO_FIRST && packetid <= MPID_VIDEO_LAST)

                  {

                  /* look inside PES packet to report on details of video packets */

                    unsigned int remaining = readlen;

                    jmp_buf resume;

                  /* GCC extension! nested routine */

                    void bufread(void *ptr, int len, bool required)

                      {

                        const unsigned int tocopy = remaining > len ? len : remaining;

                        if (tocopy != 0)

                          {

                            memcpy(ptr, buf + contentoffs, tocopy);

                            ptr = (unsigned char *)ptr + tocopy;

                            len -= tocopy;

                            contentoffs += tocopy;

                            remaining -= tocopy;

                            inputpos += tocopy;

                          } /*if*/

                        if (len != 0)

                          {

                          /* read more of packet */

                            const unsigned int toread = packetlen < len ? packetlen : len;

                            readinput(ptr, toread, required);

                            if (dowrite)

                              {

                                writetostream(packetid, ptr, toread);

                              } /*if*/

                            packetlen -= toread;

                            len -= toread;

                            if (len != 0)

                              {

                                if (false /*required*/)

                                  {

                                    fprintf(stderr, "Unexpected nested read EOF\n");

                                  } /*if*/

                                longjmp(resume, 1);

                              } /*if*/

                          } /*if*/

                      } /*bufread*/

                    inputpos -= remaining; /* rewind to start of packet content */

                    if (!setjmp(resume))

                      {

                        process_packets(bufread, true);

                      } /*if*/

                  }

                else

#endif