Check channel number when opening audio device

The configured channel number for an audio device is now checked against
the value set in CARD_CHANNELS before trying to open the audio device.

src/async/audio/AsyncAudioDevice.h

@@ -227,7 +227,8 @@ class AudioDevice : public sigc::trackable
       AudioDevice::channels = channels;
     }
 
-    
+    static int getChannels(void) { return channels; }
+
     /**
      * @brief 	Check if the audio device has full duplex capability
      * @return	Returns \em true if the device has full duplex capability

src/async/audio/AsyncAudioIO.cpp

@@ -318,6 +318,16 @@ bool AudioIO::isFullDuplexCapable(void)
 
 bool AudioIO::open(Mode mode)
 {
+  if (m_channel >= AudioDevice::getChannels())
+  {
+    std::cerr << "*** ERROR: Audio channel out of range when opening audio "
+                 "device \"" << audio_dev->devName() << ". "
+              << "The card have " << AudioDevice::getChannels()
+              << " channel(s) configured, but (zero based) channel number "
+              << m_channel << " was requested." << std::endl;
+    return false;
+  }
+
   if (audio_dev == 0)
   {
     return false;

src/versions

@@ -8,7 +8,7 @@ QTEL=1.2.4
 LIBECHOLIB=1.3.3
 
 # Version for the Async library
-LIBASYNC=1.6.0.99.9
+LIBASYNC=1.6.0.99.10
 
 # SvxLink versions
 SVXLINK=1.7.99.23