libmpcodecs/vf_fixpts.c

   1 /*
   2     Copyright (C) 2007 Nicolas George <nicolas.george@normalesup.org>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program 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
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  17 */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <inttypes.h>
  23
  24 #include "config.h"
  25 #include "mp_msg.h"
  26 #include "help_mp.h"
  27
  28 #include "img_format.h"
  29 #include "mp_image.h"
  30 #include "vf.h"
  31
  32 struct vf_priv_s {
  33     double current;
  34     double step;
  35     int autostart;
  36     int autostep;
  37     unsigned have_step: 1;
  38     unsigned print: 1;
  39 };
  40
  41 static int put_image(vf_instance_t *vf, mp_image_t *src, double pts)
  42 {
  43     struct vf_priv_s *p = vf->priv;
  44
  45     if(p->print) {
  46         if(pts == MP_NOPTS_VALUE)
  47             printf("PTS: undef\n");
  48         else
  49             printf("PTS: %f\n", pts);
  50     }
  51     if(pts != MP_NOPTS_VALUE && p->autostart != 0) {
  52         p->current = pts;
  53         if(p->autostart > 0)
  54             p->autostart--;
  55     } else if(pts != MP_NOPTS_VALUE && p->autostep > 0) {
  56         p->step = pts - p->current;
  57         p->current = pts;
  58         p->autostep--;
  59         p->have_step = 1;
  60     } else if(p->have_step) {
  61         p->current += p->step;
  62         pts = p->current;
  63     } else {
  64         pts = MP_NOPTS_VALUE;
  65     }
  66     return vf_next_put_image(vf, src, pts);
  67 }
  68
  69 static void uninit(vf_instance_t *vf)
  70 {
  71     free(vf->priv);
  72 }
  73
  74 static int parse_args(struct vf_priv_s *p, const char *args)
  75 {
  76     int pos;
  77     double num, denom = 1;
  78     int iarg;
  79
  80     while(*args != 0) {
  81         pos = 0;
  82         if(sscanf(args, "print%n", &pos) == 0 && pos > 0) {
  83             p->print = 1;
  84         } else if(sscanf(args, "fps=%lf%n/%lf%n", &num, &pos, &denom, &pos) >= 1
  85             && pos > 0) {
  86             p->step = denom / num;
  87             p->have_step = 1;
  88         } else if(sscanf(args, "start=%lf%n", &num, &pos) >= 1 && pos > 0) {
  89             p->current = num;
  90         } else if(sscanf(args, "autostart=%d%n", &iarg, &pos) == 1 && pos > 0) {
  91             p->autostart = iarg;
  92         } else if(sscanf(args, "autofps=%d%n", &iarg, &pos) == 1 && pos > 0) {
  93             p->autostep = iarg;
  94         } else {
  95             mp_msg(MSGT_VFILTER, MSGL_FATAL,
  96                 "fixpts: unknown suboption: %s\n", args);
  97             return 0;
  98         }
  99         args += pos;
 100         if(*args == ':')
 101             args++;
 102     }
 103     return 1;
 104 }
 105
 106 static int open(vf_instance_t *vf, char *args)
 107 {
 108     struct vf_priv_s *p;
 109     struct vf_priv_s ptmp = {
 110         .current = 0,
 111         .step = 0,
 112         .autostart = 0,
 113         .autostep = 0,
 114         .have_step = 0,
 115         .print = 0,
 116     };
 117
 118     if(!parse_args(&ptmp, args == NULL ? "" : args))
 119         return 0;
 120
 121     vf->put_image = put_image;
 122     vf->uninit = uninit;
 123     vf->priv = p = malloc(sizeof(struct vf_priv_s));
 124     *p = ptmp;
 125     p->current = -p->step;
 126
 127     return 1;
 128 }
 129
 130 vf_info_t vf_info_fixpts = {
 131   "Fix presentation timestamps",
 132   "fixpts",
 133   "Nicolas George",
 134   "",
 135   &open,
 136   NULL
 137 };