cinelerra-5.1/plugins/dcoffset/dcoffset.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2009 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "clip.h"
  23 #include "bchash.h"
  24 #include "dcoffset.h"
  25 #include "filexml.h"
  26 #include "language.h"
  27 #include "samples.h"
  28 #include "transportque.h"
  29
  30 #include "vframe.h"
  31
  32 #include <string.h>
  33
  34
  35 #define WINDOW_SIZE 65536
  36
  37 REGISTER_PLUGIN(DCOffset)
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47 DCOffset::DCOffset(PluginServer *server)
  48  : PluginAClient(server)
  49 {
  50         need_collection = 1;
  51         reference = 0;
  52 }
  53
  54 DCOffset::~DCOffset()
  55 {
  56         delete reference;
  57 }
  58
  59 const char* DCOffset::plugin_title() { return N_("DC Offset"); }
  60 int DCOffset::is_realtime() { return 1; }
  61
  62
  63
  64 int DCOffset::process_buffer(int64_t size,
  65         Samples *buffer,
  66         int64_t start_position,
  67         int sample_rate)
  68 {
  69         load_configuration();
  70         double *buffer_samples = buffer->get_data();
  71         double *reference_samples = !reference ? 0 : reference->get_data();
  72
  73         if(need_collection)
  74         {
  75                 if(!reference) {
  76                         reference = new Samples(WINDOW_SIZE);
  77                         reference_samples = reference->get_data();
  78                 }
  79                 int64_t collection_start = 0;
  80                 if(get_direction() == PLAY_REVERSE)
  81                         collection_start += WINDOW_SIZE;
  82                 read_samples(reference,
  83                         0,
  84                         sample_rate,
  85                         collection_start,
  86                         WINDOW_SIZE);
  87                 offset = 0;
  88                 for(int i = 0; i < WINDOW_SIZE; i++)
  89                 {
  90                         offset += reference_samples[i];
  91                 }
  92                 offset /= WINDOW_SIZE;
  93                 need_collection = 0;
  94         }
  95
  96         read_samples(buffer,
  97                 0,
  98                 sample_rate,
  99                 start_position,
 100                 size);
 101
 102         for(int i = 0; i < size; i++)
 103         {
 104                 buffer_samples[i] -= offset;
 105         }
 106
 107         return 0;
 108 }
 109
 110
 111