fmtx.c

/*
 * Support for formatting time stamps
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the MPEG TS, PS and ES tools.
 *
 * The Initial Developer of the Original Code is Amino Communications Ltd.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Amino Communications Ltd, Swavesey, Cambridge UK
 *
 * ***** END LICENSE BLOCK *****
 */ 

#include <stdio.h>
#ifdef _WIN32
#include <stddef.h>
#else // _WIN32
#include <unistd.h>
#endif // _WIN32
#include <string.h>

#include "compat.h"
#include "fmtx.h"

static TCHAR fmtx_buffers[FMTX_BUFFERS_COUNT][FMTX_BUFFER_SIZE];
static int fmtx_buf_no = 0;

TCHAR *fmtx_alloc()
{
  const int n = fmtx_buf_no++ % FMTX_BUFFERS_COUNT;
  return fmtx_buffers[n];
}

int frac_27MHz(int64_t n)
{
  return (int)((n < 0 ? -n : n) % 300LL);
}

const TCHAR *fmtx_timestamp(int64_t n, unsigned int flags)
{
  TCHAR *buf = fmtx_alloc();
  int64_t n27 = n * ((flags & FMTX_TS_N_27MHz) != 0 ? 1LL : 300LL);

  switch (flags & FMTX_TS_DISPLAY_MASK)
  {
  default:
  case FMTX_TS_DISPLAY_90kHz_RAW:
    _sntprintf(buf, FMTX_BUFFER_SIZE, _T("%") I64FMT _T("dt"), n27 / 300LL);
    break;

  case FMTX_TS_DISPLAY_27MHz_RAW:
    _sntprintf(buf, FMTX_BUFFER_SIZE, _T("%") I64FMT _T("d:%03dt"), n27 / 300LL, frac_27MHz(n27));
    break;

  case FMTX_TS_DISPLAY_90kHz_32BIT:
    {
      int64_t n90 = n27 / 300LL;
      TCHAR * p = buf;
      if (n90 < 0)
        *p++ = _T('-');
      _sntprintf(p, FMTX_BUFFER_SIZE, _T("%ut"), (unsigned int)(n90 < 0 ? -n90 : n90));
      break;
    }

  case FMTX_TS_DISPLAY_ms:
    // No timestamp when converted into ms should exceed 32bits
    _sntprintf(buf, FMTX_BUFFER_SIZE, _T("%dms"), (int)(n27 / 27000LL));
    break;

  case FMTX_TS_DISPLAY_HMS:
    {
      unsigned int h, m, s, f;
      int64_t a27 = n27 < 0 ? -n27 : n27;
      a27 /= I64K(27); //us
      f = (unsigned int)(a27 % I64K(1000000));
      a27 /= I64K(1000000);
      s = (unsigned int)(a27 % I64K(60));
      a27 /= I64K(60);
      m = (unsigned int)(a27 % I64K(60));
      h = (unsigned int)(a27 / I64K(60));
      _sntprintf(buf, FMTX_BUFFER_SIZE, _T("%s%u:%02u:%02u.%04u"), n27 < 0 ? _T("-") : _T(""), h, m, s, f/1000);
      break;
    }

  }
  return (const TCHAR *)buf;
}


static const struct s2tsfss 
{
  const char * str;
  int flags;
} s2tsf[] =
{
  {"hms", FMTX_TS_DISPLAY_HMS},
  {"ms", FMTX_TS_DISPLAY_ms},
  {"90", FMTX_TS_DISPLAY_90kHz_RAW},
  {"32", FMTX_TS_DISPLAY_90kHz_32BIT},
  {"27", FMTX_TS_DISPLAY_27MHz_RAW},
  {NULL, -1}
};

int fmtx_str_to_timestamp_flags(const TCHAR *arg_str)
{
  const struct s2tsfss * p;
  for (p = s2tsf; p->str != NULL; ++p)
  {
    if (strcmp(p->str, arg_str) == 0)
      break;
  }
  return p->flags;
}

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