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

[goodguy/history.git] / cinelerra-5.1 / cinelerra / samples.C

diff --git a/cinelerra-5.1/cinelerra/samples.C b/cinelerra-5.1/cinelerra/samples.C
new file mode 100644 (file)
index 0000000..4e30c6b
--- /dev/null
+++ b/cinelerra-5.1/cinelerra/samples.C
@@ -0,0 +1,170 @@
+
+/*
+ * 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
+ * 
+ */
+
+
+
+// An object which contains samples
+
+
+
+#include "samples.h"
+#include <stdio.h>
+#include <sys/shm.h>
+#include <unistd.h>
+
+
+Samples::Samples()
+{
+       reset();
+}
+
+// Allocate number of samples
+Samples::Samples(int samples)
+{
+       reset();
+       allocate(samples, 1);
+}
+
+Samples::Samples(Samples *src)
+{
+       reset();
+       share(src->get_shmid());
+       set_allocated(src->get_allocated());
+       set_offset(src->get_offset());
+}
+
+Samples::~Samples()
+{
+       clear_objects();
+}
+
+void Samples::reset()
+{
+       use_shm = 1;
+       shmid = -1;
+       data = 0;
+       allocated = 0;
+       offset = 0;
+}
+
+void Samples::clear_objects()
+{
+       if(use_shm)
+       {
+               if(data) shmdt(data);
+       }
+       else
+       {
+               delete [] data;
+       }
+
+       reset();
+}
+
+
+void Samples::share(int shmid)
+{
+       if(data)
+       {
+               if(use_shm)
+                       shmdt(data);
+               else
+                       delete [] data;
+       }
+
+       this->use_shm = 1;
+       data = (double*)shmat(shmid, NULL, 0);
+       this->allocated = 0;
+       this->shmid = shmid;
+}
+
+void Samples::allocate(int samples, int use_shm)
+{
+       if(data && 
+               this->allocated >= samples && 
+               this->use_shm == use_shm) return;
+
+       if(data) 
+       {
+               if(this->use_shm)
+                       shmdt(data);
+               else
+                       delete [] data;
+       }
+       
+       this->use_shm = use_shm;
+
+       if(use_shm)
+       {
+               shmid = shmget(IPC_PRIVATE, 
+                       (samples + 1) * sizeof(double), 
+                       IPC_CREAT | 0777);
+               data = (double*)shmat(shmid, NULL, 0);
+       // This causes it to automatically delete when the program exits.
+               shmctl(shmid, IPC_RMID, 0);
+       }
+       else
+       {
+               shmid = -1;
+               data = new double[samples];
+       }
+       
+       
+       this->allocated = samples;
+
+
+
+       
+}
+
+// Get the buffer
+double* Samples::get_data()
+{
+       return data + offset;
+}
+
+// Get number of samples allocated
+int Samples::get_allocated()
+{
+       return allocated;
+}
+
+// Set number of samples allocated
+void Samples::set_allocated(int allocated)
+{
+       this->allocated = allocated;
+}
+
+int Samples::get_shmid()
+{
+       return shmid;
+}
+
+void Samples::set_offset(int offset)
+{
+       this->offset = offset;
+}
+
+int Samples::get_offset()
+{
+       return offset;
+}
+