Go back to single mmap video buffer

Second mmap to the fixed address in the end of the first mmapped buffer
results in application crash. Do not use double mmapping and process
buffer roll over.

src/main.cpp

@@ -73,8 +73,10 @@ int main(int argc, char *argv[]) {
 		cerr << "|" << (*it).first << "| == |" << (*it).second << "|" << endl;
 	}
 
-	for (int i = 0; i < SENSOR_PORTS; i++) {
+	for (int i = 0; i < 1; i++) {
+//	for (int i = 0; i < SENSOR_PORTS; i++) {
 		pthread_attr_t attr;
+		cout << "Start thread " << i << endl;
 		streamers[i] = new Streamer(args, i);
 
 		pthread_attr_init(&attr);

src/socket.cpp

@@ -420,3 +420,13 @@ bool Socket::send3v(void **v_ptr, int *v_len) {
 		return true;
 	return false;
 }
+
+bool Socket::send_vect(const struct iovec *iov, int num)
+{
+	bool ret_val = false;
+
+	if (::writev(fd, iov, num))
+		ret_val = true;
+
+	return ret_val;
+}

src/socket.h

@@ -58,6 +58,7 @@ public:
 	bool send(const string data);
 	bool send2v(void **v_ptr, int *v_len);
 	bool send3v(void **v_ptr, int *v_len);
+	bool send_vect(const struct iovec *iov, int num);
 
 	static int poll(list<Socket *> &s, int timeout = -1);
 	void listen(int in);

src/video.h

@@ -77,7 +77,6 @@ protected:
 //	struct timeval f_tv;
 	long buffer_length;
 	unsigned long *buffer_ptr;
-	unsigned long *buffer_ptr_s;  /// Second copy of the circbuf just after the end of the first to prevent rollovers
 	void *frame_ptr;
 	int fd_circbuf;
 	int fd_jpeghead;
@@ -85,6 +84,8 @@ protected:
 	long capture(void);
 //	bool process(void);
 	long  process(void);
+	unsigned long get_frame_len(unsigned long offset);
+	void get_frame_pars(void *frame_pars, unsigned long offset);
 
 	// for statistic
 	long v_t_sec;