libavutil/timestamp.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "timestamp.h"
  20
  21 char *av_ts_make_time_string2(char *buf, int64_t ts, AVRational tb)
  22 {
  23     if (ts == AV_NOPTS_VALUE) {
  24         snprintf(buf, AV_TS_MAX_STRING_SIZE, "NOPTS");
  25     } else {
  26         double val = av_q2d(tb) * ts;
  27         double log = (fpclassify(val) == FP_ZERO ? -INFINITY : floor(log10(fabs(val))));
  28         int precision = (isfinite(log) && log < 0) ? -log + 5 : 6;
  29         int last = snprintf(buf, AV_TS_MAX_STRING_SIZE, "%.*f", precision, val);
  30         last = FFMIN(last, AV_TS_MAX_STRING_SIZE - 1) - 1;
  31         for (; last && buf[last] == '0'; last--);
  32         for (; last && buf[last] != 'f' && (buf[last] < '0' || buf[0] > '9'); last--);
  33         buf[last + 1] = '\0';
  34     }
  35     return buf;
  36 }