add analysis_thread

src/zm_analysis_thread.cpp

@@ -0,0 +1,44 @@
+#include "zm_analysis_thread.h"
+
+
+AnalysisThread::AnalysisThread( Monitor *p_monitor ) {
+  monitor = p_monitor;
+  terminate = false;
+  sigemptyset( &block_set );
+}
+
+AnalysisThread::~AnalysisThread() {
+}
+
+int AnalysisThread::run() {
+
+  useconds_t analysis_rate = monitor->GetAnalysisRate();
+  unsigned int analysis_update_delay = monitor->GetAnalysisUpdateDelay();
+  time_t last_analysis_update_time, cur_time;
+  monitor->UpdateAdaptiveSkip();
+  last_analysis_update_time = time( 0 );
+
+  while( !terminate ) {
+    // Process the next image
+    sigprocmask( SIG_BLOCK, &block_set, 0 );
+
+    // Some periodic updates are required for variable capturing framerate
+    if ( analysis_update_delay ) {
+      cur_time = time( 0 );
+      if ( (unsigned int)( cur_time - last_analysis_update_time ) > analysis_update_delay ) {
+        analysis_rate = monitor->GetAnalysisRate();
+        monitor->UpdateAdaptiveSkip();
+        last_analysis_update_time = cur_time;
+      }
+    }
+
+    if ( !monitor->Analyse() ) {
+      usleep( monitor->Active()?ZM_SAMPLE_RATE:ZM_SUSPENDED_RATE );
+    } else if ( analysis_rate ) {
+      usleep( analysis_rate );
+    }
+
+    sigprocmask( SIG_UNBLOCK, &block_set, 0 );
+  }
+  return 0;
+} // end in AnalysisThread::run()