Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / plugins / dcoffset / dcoffset.C

diff --git a/cinelerra-5.1/plugins/dcoffset/dcoffset.C b/cinelerra-5.1/plugins/dcoffset/dcoffset.C
new file mode 100644 (file)
index 0000000..8702ba5
--- /dev/null
+++ b/cinelerra-5.1/plugins/dcoffset/dcoffset.C
@@ -0,0 +1,111 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2009 Adam Williams <broadcast at earthling dot net>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#include "clip.h"
+#include "bchash.h"
+#include "dcoffset.h"
+#include "filexml.h"
+#include "language.h"
+#include "samples.h"
+#include "transportque.h"
+
+#include "vframe.h"
+
+#include <string.h>
+
+
+#define WINDOW_SIZE 65536
+
+REGISTER_PLUGIN(DCOffset)
+
+
+
+
+
+
+
+
+
+DCOffset::DCOffset(PluginServer *server)
+ : PluginAClient(server)
+{
+       need_collection = 1;
+       reference = 0;
+}
+
+DCOffset::~DCOffset()
+{
+       delete reference;
+}
+
+const char* DCOffset::plugin_title() { return _("DC Offset"); }
+int DCOffset::is_realtime() { return 1; }
+
+
+
+int DCOffset::process_buffer(int64_t size, 
+       Samples *buffer,
+       int64_t start_position,
+       int sample_rate)
+{
+       load_configuration();
+       double *buffer_samples = buffer->get_data();
+       double *reference_samples = !reference ? 0 : reference->get_data();
+       
+       if(need_collection)
+       {
+               if(!reference) {
+                       reference = new Samples(WINDOW_SIZE);
+                       reference_samples = reference->get_data();
+               }
+               int64_t collection_start = 0;
+               if(get_direction() == PLAY_REVERSE)
+                       collection_start += WINDOW_SIZE;
+               read_samples(reference,
+                       0,
+                       sample_rate,
+                       collection_start,
+                       WINDOW_SIZE);
+               offset = 0;
+               for(int i = 0; i < WINDOW_SIZE; i++)
+               {
+                       offset += reference_samples[i];
+               }
+               offset /= WINDOW_SIZE;
+               need_collection = 0;
+       }
+
+       read_samples(buffer,
+               0,
+               sample_rate,
+               start_position,
+               size);
+
+       for(int i = 0; i < size; i++)
+       {
+               buffer_samples[i] -= offset;
+       }
+
+       return 0;
+}
+
+
+