avi2swf/videoreader_dummy.cc

   1 /* videoreader_dummy.cc
   2    Simple example for a videoreader.
   3
   4    Part of the swftools package.
   5
   6    Copyright (c) 2004 Matthias Kramm <kramm@quiss.org>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <memory.h>
  25 #include "videoreader.h"
  26
  27 typedef struct _my_internal
  28 {
  29     int pos;
  30     int len; //frames
  31 } my_internal;
  32
  33 typedef struct _RGBA
  34 { unsigned char a;
  35   unsigned char r;
  36   unsigned char g;
  37   unsigned char b;
  38 } RGBA;
  39
  40 int my_getsamples(videoreader_t* v, void*buffer, int num)
  41 {
  42     /* generate audio data */
  43     my_internal*i = (my_internal*)v->internal;
  44     // printf("request for %d samples\n", num);
  45
  46     return 0; // no audio
  47 }
  48
  49 int my_getimage(videoreader_t* v, void*buffer)
  50 {
  51     /* generate video frame */
  52     my_internal*i = (my_internal*)v->internal;
  53     RGBA*buf = (RGBA*)buffer;
  54
  55     if(i->pos>=i->len)
  56         return 0; /* end of video */
  57
  58     i->pos++; // next frame
  59
  60     int x,y;
  61     /* generate a simple color gradient */
  62     for(y=0;y<v->height;y++)
  63     for(x=0;x<v->width;x++) {
  64         int r,g,b;
  65         r = x;
  66         g = y;
  67         b = x+y;
  68         buf[y*v->width + x].r = r;
  69         buf[y*v->width + x].g = g;
  70         buf[y*v->width + x].b = b;
  71         buf[y*v->width + x].a = 255;
  72     }
  73     return v->width*v->height*4;
  74 }
  75 void my_close(videoreader_t* v)
  76 {
  77     my_internal*i = (my_internal*)v->internal;
  78     free(v->internal);v->internal = 0;
  79 }
  80 void my_setparameter(videoreader_t*v, char*name, char*value)
  81 {
  82 }
  83 int videoreader_dummy_open(videoreader_t* v, char* filename)
  84 {
  85     my_internal* i;
  86     i = (my_internal*)malloc(sizeof(my_internal));
  87     memset(i, 0, sizeof(my_internal));
  88     v->internal = i;
  89     v->getsamples = my_getsamples;
  90     v->close = my_close;
  91     v->getimage = my_getimage;
  92     v->getsamples = my_getsamples;
  93     v->setparameter = my_setparameter;
  94
  95     i->len = 2000; //number of frames
  96
  97     v->width = 320; // video
  98     v->height = 200;
  99     v->fps = 15;
 100
 101     v->channels = 0; // no audio
 102     v->samplerate = 0;
 103
 104     return 0;
 105 }