libaf/af_dummy.c

   1 /*
   2  * The name speaks for itself. This filter is a dummy and will
   3  * not blow up regardless of what you do with it.
   4  *
   5  * This file is part of MPlayer.
   6  *
   7  * MPlayer is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * MPlayer 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
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include "af.h"
  27
  28 // Initialization and runtime control
  29 static int control(struct af_instance_s* af, int cmd, void* arg)
  30 {
  31   switch(cmd){
  32   case AF_CONTROL_REINIT:
  33     memcpy(af->data,(af_data_t*)arg,sizeof(af_data_t));
  34     mp_msg(MSGT_AFILTER, MSGL_V, "[dummy] Was reinitialized: %iHz/%ich/%s\n",
  35         af->data->rate,af->data->nch,af_fmt2str_short(af->data->format));
  36     return AF_OK;
  37   }
  38   return AF_UNKNOWN;
  39 }
  40
  41 // Deallocate memory
  42 static void uninit(struct af_instance_s* af)
  43 {
  44   if(af->data)
  45     free(af->data);
  46 }
  47
  48 // Filter data through filter
  49 static af_data_t* play(struct af_instance_s* af, af_data_t* data)
  50 {
  51   // Do something necessary to get rid of annoying warning during compile
  52   if(!af)
  53     mp_msg(MSGT_AFILTER, MSGL_ERR, "EEEK: Argument af == NULL in af_dummy.c play().");
  54   return data;
  55 }
  56
  57 // Allocate memory and set function pointers
  58 static int af_open(af_instance_t* af){
  59   af->control=control;
  60   af->uninit=uninit;
  61   af->play=play;
  62   af->mul=1;
  63   af->data=malloc(sizeof(af_data_t));
  64   if(af->data == NULL)
  65     return AF_ERROR;
  66   return AF_OK;
  67 }
  68
  69 // Description of this filter
  70 af_info_t af_info_dummy = {
  71     "dummy",
  72     "dummy",
  73     "Anders",
  74     "",
  75     AF_FLAGS_REENTRANT,
  76     af_open
  77 };