libmpcodecs/vf_fixpts.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer 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  * MPlayer 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 along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, 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
  27 #include "img_format.h"
  28 #include "mp_image.h"
  29 #include "vf.h"
  30
  31 struct vf_priv_s {
  32     double current;
  33     double step;
  34     int autostart;
  35     int autostep;
  36     unsigned have_step:1;
  37     unsigned print:1;
  38 };
  39
  40 static int put_image(vf_instance_t *vf, mp_image_t *src, double pts)
  41 {
  42     struct vf_priv_s *p = vf->priv;
  43
  44     if (p->print) {
  45         if (pts == MP_NOPTS_VALUE)
  46             mp_msg(MSGT_VFILTER, MSGL_INFO, "PTS: undef\n");
  47         else
  48             mp_msg(MSGT_VFILTER, MSGL_INFO, "PTS: %f\n", pts);
  49     }
  50     if (pts != MP_NOPTS_VALUE && p->autostart != 0) {
  51         p->current = pts;
  52         if (p->autostart > 0)
  53             p->autostart--;
  54     } else if (pts != MP_NOPTS_VALUE && p->autostep > 0) {
  55         p->step = pts - p->current;
  56         p->current = pts;
  57         p->autostep--;
  58         p->have_step = 1;
  59     } else if (p->have_step) {
  60         p->current += p->step;
  61         pts = p->current;
  62     } else {
  63         pts = MP_NOPTS_VALUE;
  64     }
  65     return vf_next_put_image(vf, src, pts);
  66 }
  67
  68 static void uninit(vf_instance_t *vf)
  69 {
  70     free(vf->priv);
  71 }
  72
  73 static int parse_args(struct vf_priv_s *p, const char *args)
  74 {
  75     int pos;
  76     double num, denom = 1;
  77     int iarg;
  78
  79     while (*args != 0) {
  80         pos = 0;
  81         if (sscanf(args, "print%n", &pos) == 0 && pos > 0) {
  82             p->print = 1;
  83         } else if (sscanf(args, "fps=%lf%n/%lf%n", &num, &pos, &denom, &pos) >=
  84                    1 && pos > 0) {
  85             p->step = denom / num;
  86             p->have_step = 1;
  87         } else if (sscanf(args, "start=%lf%n", &num, &pos) >= 1 && pos > 0) {
  88             p->current = num;
  89         } else if (sscanf(args, "autostart=%d%n", &iarg, &pos) == 1 && pos > 0) {
  90             p->autostart = iarg;
  91         } else if (sscanf(args, "autofps=%d%n", &iarg, &pos) == 1 && pos > 0) {
  92             p->autostep = iarg;
  93         } else {
  94             mp_msg(MSGT_VFILTER, MSGL_FATAL,
  95                    "fixpts: unknown suboption: %s\n", args);
  96             return 0;
  97         }
  98         args += pos;
  99         if (*args == ':')
 100             args++;
 101     }
 102     return 1;
 103 }
 104
 105 static int open(vf_instance_t *vf, char *args)
 106 {
 107     struct vf_priv_s *p;
 108     struct vf_priv_s ptmp = {
 109         .current = 0,
 110         .step = 0,
 111         .autostart = 0,
 112         .autostep = 0,
 113         .have_step = 0,
 114         .print = 0,
 115     };
 116
 117     if (!parse_args(&ptmp, args == NULL ? "" : args))
 118         return 0;
 119
 120     vf->put_image = put_image;
 121     vf->uninit = uninit;
 122     vf->priv = p = malloc(sizeof(struct vf_priv_s));
 123     *p = ptmp;
 124     p->current = -p->step;
 125
 126     return 1;
 127 }
 128
 129 const vf_info_t vf_info_fixpts = {
 130     "Fix presentation timestamps",
 131     "fixpts",
 132     "Nicolas George",
 133     "",
 134     &open,
 135     NULL
 136 };