/*
  * Copyright (C) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
  * Copyright (C) 2011 Smartjog S.A.S, Clément Bœsch      <clement.boesch@smartjog.com>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.

  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  * Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 
 /**
  * @file
  * Timecode helpers

  * This *private* API is deprecated, please use the one available in libavutil instead.

  */
 

 #include "version.h"
 
 #if FF_API_OLD_TIMECODE
 

 #include <stdio.h>
 #include "timecode.h"
 #include "libavutil/log.h"
 

 int avpriv_framenum_to_drop_timecode(int frame_num)

 {
     /* only works for NTSC 29.97 */
     int d = frame_num / 17982;
     int m = frame_num % 17982;
     //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
     return frame_num + 18 * d + 2 * ((m - 2) / 1798);
 }
 

 uint32_t avpriv_framenum_to_smpte_timecode(unsigned frame, int fps, int drop)

 {
     return (0                                    << 31) | // color frame flag
            (drop                                 << 30) | // drop  frame flag
            ( ((frame % fps) / 10)                << 28) | // tens  of frames
            ( ((frame % fps) % 10)                << 24) | // units of frames
            (0                                    << 23) | // field phase (NTSC), b0 (PAL)
            ((((frame / fps) % 60) / 10)          << 20) | // tens  of seconds
            ((((frame / fps) % 60) % 10)          << 16) | // units of seconds
            (0                                    << 15) | // b0 (NTSC), b2 (PAL)
            ((((frame / (fps * 60)) % 60) / 10)   << 12) | // tens  of minutes
            ((((frame / (fps * 60)) % 60) % 10)   <<  8) | // units of minutes
            (0                                    <<  7) | // b1
            (0                                    <<  6) | // b2 (NTSC), field phase (PAL)
            ((((frame / (fps * 3600) % 24)) / 10) <<  4) | // tens  of hours
            (  (frame / (fps * 3600) % 24)) % 10;          // units of hours
 }
 

 int avpriv_check_timecode_rate(void *avcl, AVRational rate, int drop)

 {
     int fps;
 
     if (!rate.num || !rate.den) {
         av_log(avcl, AV_LOG_ERROR, "Timecode frame rate must be specified\n");
         return -1;
     }
     fps = (rate.num + rate.den/2) / rate.den;

     if (drop && fps != 30) {

         av_log(avcl, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 FPS\n");
         return -2;
     }
     switch (fps) {
     case 24:
     case 25:
     case 30: return  0;
 
     default:
         av_log(avcl, AV_LOG_ERROR, "Timecode frame rate not supported\n");
         return -3;
     }
 }
 

 char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame)
 {
     int frame_num = tc->start + frame;
     int fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;

     int hh, mm, ss, ff, neg = 0;

 
     if (tc->drop)

         frame_num = avpriv_framenum_to_drop_timecode(frame_num);

     if (frame_num < 0) {
         frame_num = -frame_num;
         neg = 1;
     }

     ff = frame_num % fps;
     ss = frame_num / fps        % 60;
     mm = frame_num / (fps*60)   % 60;

     hh = frame_num / (fps*3600);

     snprintf(buf, 16, "%s%02d:%02d:%02d%c%02d",
              neg ? "-" : "",

              hh, mm, ss, tc->drop ? ';' : ':', ff);
     return buf;
 }
 

 int avpriv_init_smpte_timecode(void *avcl, struct ff_timecode *tc)

 {

     int hh, mm, ss, ff, fps, ret;

     char c;
 
     if (sscanf(tc->str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
         av_log(avcl, AV_LOG_ERROR, "unable to parse timecode, "
                                    "syntax: hh:mm:ss[:;.]ff\n");
         return -1;
     }
 

     tc->drop  = c != ':'; // drop if ';', '.', ...
 

     ret = avpriv_check_timecode_rate(avcl, tc->rate, tc->drop);

     if (ret < 0)
         return ret;
 

     fps       = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
     tc->start = (hh*3600 + mm*60 + ss) * fps + ff;
 
     if (tc->drop) { /* adjust frame number */
         int tmins = 60*hh + mm;
         tc->start -= 2 * (tmins - tmins/10);
     }
     return 0;
 }

 
 int ff_framenum_to_drop_timecode(int frame_num)
 {
     return avpriv_framenum_to_drop_timecode(frame_num);
 }
 
 uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop)
 {
     return avpriv_framenum_to_smpte_timecode(frame, fps, drop);
 }
 
 int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc)
 {
     return avpriv_init_smpte_timecode(avcl, tc);
 }
 #endif