cinelerra-5.1/plugins/interpolateaudio/interpolateaudio.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008 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 "bcdisplayinfo.h"
  23 #include "clip.h"
  24 #include "bchash.h"
  25 #include "guicast.h"
  26 #include "filexml.h"
  27 #include "language.h"
  28 #include "mainprogress.h"
  29 #include "pluginaclient.h"
  30 #include "samples.h"
  31 #include "transportque.h"
  32
  33 #include <string.h>
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46 class InterpolateAudioEffect : public PluginAClient
  47 {
  48 public:
  49         InterpolateAudioEffect(PluginServer *server);
  50         ~InterpolateAudioEffect();
  51
  52         const char* plugin_title();
  53
  54         int process_buffer(int64_t size,
  55                 Samples *buffer,
  56                 int64_t start_position,
  57                 int sample_rate);
  58         int is_realtime();
  59
  60 #define FRAGMENT_SIZE 4096
  61         Samples *start_fragment;
  62         Samples *end_fragment;
  63         double start_sample;
  64         double end_sample;
  65         int64_t range_start;
  66         int64_t range_end;
  67 };
  68
  69
  70
  71
  72 REGISTER_PLUGIN(InterpolateAudioEffect)
  73
  74
  75
  76
  77
  78
  79
  80 InterpolateAudioEffect::InterpolateAudioEffect(PluginServer *server)
  81  : PluginAClient(server)
  82 {
  83         start_fragment = 0;
  84         end_fragment = 0;
  85 }
  86
  87 InterpolateAudioEffect::~InterpolateAudioEffect()
  88 {
  89         if(start_fragment) delete start_fragment;
  90         if(end_fragment) delete end_fragment;
  91 }
  92
  93
  94
  95
  96 const char* InterpolateAudioEffect::plugin_title() { return _("Interpolate"); }
  97 int InterpolateAudioEffect::is_realtime() { return 1; }
  98
  99
 100
 101
 102
 103 int InterpolateAudioEffect::process_buffer(int64_t size,
 104         Samples *buffer,
 105         int64_t start_position,
 106         int sample_rate)
 107 {
 108         if(!start_fragment) start_fragment = new Samples(FRAGMENT_SIZE);
 109         if(!end_fragment) end_fragment = new Samples(FRAGMENT_SIZE);
 110         double *buffer_samples = buffer->get_data();
 111         double *start_samples = start_fragment->get_data();
 112         double *end_samples = end_fragment->get_data();
 113
 114         if(get_direction() == PLAY_FORWARD)
 115         {
 116 // On first sample of range.  Get boundary samples of effect.
 117                 if(get_source_position() == get_source_start())
 118                 {
 119 // Need to read before desired sample to diffuse transients after audio
 120 // seeks.
 121                         range_start = get_source_start();
 122                         range_end = get_source_start() + get_total_len();
 123 //printf("InterpolateAudioEffect::process_buffer 1 %p\n", start_fragment);
 124                         read_samples(start_fragment,
 125                                 0,
 126                                 sample_rate,
 127                                 range_start - FRAGMENT_SIZE,
 128                                 FRAGMENT_SIZE);
 129                         start_sample = start_samples[FRAGMENT_SIZE - 1];
 130                         read_samples(end_fragment,
 131                                 0,
 132                                 sample_rate,
 133                                 range_end - FRAGMENT_SIZE,
 134                                 FRAGMENT_SIZE);
 135                         end_sample = end_samples[FRAGMENT_SIZE - 1];
 136                 }
 137
 138
 139                 for(int i = 0; i < size; i++)
 140                 {
 141                         double end_fraction = (double)(i + start_position - range_start) /
 142                                 (range_end - range_start);
 143                         double start_fraction = 1.0 - end_fraction;
 144                         double out_sample = start_sample * start_fraction +
 145                                 end_sample * end_fraction;
 146                         buffer_samples[i] = out_sample;
 147                 }
 148         }
 149         else
 150         {
 151 // On first sample of range.  Get boundary samples of effect.
 152                 if(get_source_position() == get_source_start() + get_total_len())
 153                 {
 154 // Need to read before desired sample to diffuse transients after audio
 155 // seeks.
 156                         range_start = get_source_start() + get_total_len();
 157                         range_end = get_source_start();
 158                         read_samples(start_fragment,
 159                                 0,
 160                                 sample_rate,
 161                                 range_start,
 162                                 FRAGMENT_SIZE);
 163                         start_sample = start_samples[0];
 164                         read_samples(end_fragment,
 165                                 0,
 166                                 sample_rate,
 167                                 range_end,
 168                                 FRAGMENT_SIZE);
 169                         end_sample = end_samples[0];
 170                 }
 171
 172
 173                 for(int i = 0; i < size; i++)
 174                 {
 175                         double start_fraction = (double)(start_position - i - range_end) /
 176                                 (range_start - range_end);
 177                         double end_fraction = 1.0 - start_fraction;
 178                         double out_sample = start_sample * start_fraction +
 179                                 end_sample * end_fraction;
 180                         buffer_samples[i] = out_sample;
 181                 }
 182         }
 183         return 0;
 184 }
 185
 186