introduce device discovery api

This API allows to acquire a list of devices connected to the host and
creates an argument string ready to be passed to a source object for
cunstruction.

Each device_t entry contains a "label" entry, which holds the generic
device name which may be shown to the user for device selection.

For certain radio hardware extended entries ("name", "serial", "type")
may be available to make bijective device addressing possible.

The argument string for target types "rtl_tcp" and "file" might be
constructed using the osmosdr::device_t class facilities.

Example:

 #include <osmosdr_device.h>
 #include <osmosdr_source_c.h>

osmosdr::devices_t devs = osmosdr::device::find();

BOOST_FOREACH(osmosdr::device_t &dev, devs) // try to create each dev
  osmosdr_source_c_sptr src = osmosdr_make_source_c(dev.to_string());

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/osmosdr/osmosdr_control.cc b/lib/osmosdr/osmosdr_control.cc
index 4e3f70a..7de2773 100644
--- a/lib/osmosdr/osmosdr_control.cc
+++ b/lib/osmosdr/osmosdr_control.cc
@@ -45,7 +45,7 @@ osmosdr_control::~osmosdr_control()
 /*
   1 [OsmoSDR        ]: USB-Audio - OsmoSDR
                        sysmocom OsmoSDR at usb-0000:00:06.1-2, high speed
-*/
+ */
 std::vector< std::string > osmosdr_control::find_devices()
 {
   std::vector< std::string > devices;