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  1. /*
  2.  * Copyright (C) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
  3.  * Copyright (C) 2011 Smartjog S.A.S, Clément Bœsch      <clement.boesch@smartjog.com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Timecode helpers
  25.  * This *private* API is deprecated, please use the one available in libavutil instead.
  26.  */
  27.  
  28. #include "version.h"
  29.  
  30. #if FF_API_OLD_TIMECODE
  31.  
  32. #include <stdio.h>
  33. #include "timecode.h"
  34. #include "libavutil/log.h"
  35.  
  36. int avpriv_framenum_to_drop_timecode(int frame_num)
  37. {
  38.     /* only works for NTSC 29.97 */
  39.     int d = frame_num / 17982;
  40.     int m = frame_num % 17982;
  41.     //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
  42.     return frame_num + 18 * d + 2 * ((m - 2) / 1798);
  43. }
  44.  
  45. uint32_t avpriv_framenum_to_smpte_timecode(unsigned frame, int fps, int drop)
  46. {
  47.     return (0                                    << 31) | // color frame flag
  48.            (drop                                 << 30) | // drop  frame flag
  49.            ( ((frame % fps) / 10)                << 28) | // tens  of frames
  50.            ( ((frame % fps) % 10)                << 24) | // units of frames
  51.            (0                                    << 23) | // field phase (NTSC), b0 (PAL)
  52.            ((((frame / fps) % 60) / 10)          << 20) | // tens  of seconds
  53.            ((((frame / fps) % 60) % 10)          << 16) | // units of seconds
  54.            (0                                    << 15) | // b0 (NTSC), b2 (PAL)
  55.            ((((frame / (fps * 60)) % 60) / 10)   << 12) | // tens  of minutes
  56.            ((((frame / (fps * 60)) % 60) % 10)   <<  8) | // units of minutes
  57.            (0                                    <<  7) | // b1
  58.            (0                                    <<  6) | // b2 (NTSC), field phase (PAL)
  59.            ((((frame / (fps * 3600) % 24)) / 10) <<  4) | // tens  of hours
  60.            (  (frame / (fps * 3600) % 24)) % 10;          // units of hours
  61. }
  62.  
  63. int avpriv_check_timecode_rate(void *avcl, AVRational rate, int drop)
  64. {
  65.     int fps;
  66.  
  67.     if (!rate.num || !rate.den) {
  68.         av_log(avcl, AV_LOG_ERROR, "Timecode frame rate must be specified\n");
  69.         return -1;
  70.     }
  71.     fps = (rate.num + rate.den/2) / rate.den;
  72.     if (drop && fps != 30) {
  73.         av_log(avcl, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 FPS\n");
  74.         return -2;
  75.     }
  76.     switch (fps) {
  77.     case 24:
  78.     case 25:
  79.     case 30: return  0;
  80.  
  81.     default:
  82.         av_log(avcl, AV_LOG_ERROR, "Timecode frame rate not supported\n");
  83.         return -3;
  84.     }
  85. }
  86.  
  87. char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame)
  88. {
  89.     int frame_num = tc->start + frame;
  90.     int fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
  91.     int hh, mm, ss, ff, neg = 0;
  92.  
  93.     if (tc->drop)
  94.         frame_num = avpriv_framenum_to_drop_timecode(frame_num);
  95.     if (frame_num < 0) {
  96.         frame_num = -frame_num;
  97.         neg = 1;
  98.     }
  99.     ff = frame_num % fps;
  100.     ss = frame_num / fps        % 60;
  101.     mm = frame_num / (fps*60)   % 60;
  102.     hh = frame_num / (fps*3600);
  103.     snprintf(buf, 16, "%s%02d:%02d:%02d%c%02d",
  104.              neg ? "-" : "",
  105.              hh, mm, ss, tc->drop ? ';' : ':', ff);
  106.     return buf;
  107. }
  108.  
  109. int avpriv_init_smpte_timecode(void *avcl, struct ff_timecode *tc)
  110. {
  111.     int hh, mm, ss, ff, fps, ret;
  112.     char c;
  113.  
  114.     if (sscanf(tc->str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
  115.         av_log(avcl, AV_LOG_ERROR, "unable to parse timecode, "
  116.                                    "syntax: hh:mm:ss[:;.]ff\n");
  117.         return -1;
  118.     }
  119.  
  120.     tc->drop  = c != ':'; // drop if ';', '.', ...
  121.  
  122.     ret = avpriv_check_timecode_rate(avcl, tc->rate, tc->drop);
  123.     if (ret < 0)
  124.         return ret;
  125.  
  126.     fps       = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
  127.     tc->start = (hh*3600 + mm*60 + ss) * fps + ff;
  128.  
  129.     if (tc->drop) { /* adjust frame number */
  130.         int tmins = 60*hh + mm;
  131.         tc->start -= 2 * (tmins - tmins/10);
  132.     }
  133.     return 0;
  134. }
  135.  
  136. int ff_framenum_to_drop_timecode(int frame_num)
  137. {
  138.     return avpriv_framenum_to_drop_timecode(frame_num);
  139. }
  140.  
  141. uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop)
  142. {
  143.     return avpriv_framenum_to_smpte_timecode(frame, fps, drop);
  144. }
  145.  
  146. int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc)
  147. {
  148.     return avpriv_init_smpte_timecode(avcl, tc);
  149. }
  150. #endif
  151.