alsa driver/adapter improvements to flexibly use playback/capture devices through dbus calls patch.

linux/alsa/JackAlsaAdapter.cpp

@@ -54,8 +54,14 @@ namespace Jack
                     fPlaybackChannels = param->value.ui;
                     break;
                 case 'C':
+                    if (strncmp(param->value.str,"none",4) != 0) {
+                        fAudioInterface.fCaptureName = strdup ( param->value.str );
+                    }
                     break;
                 case 'P':
+                    if  (strncmp(param->value.str,"none",4) != 0) {
+                        fAudioInterface.fPlaybackName = strdup ( param->value.str );
+                    }
                     break;
                 case 'D':
                     break;

linux/alsa/JackAlsaAdapter.h

@@ -130,6 +130,8 @@ namespace Jack
             snd_pcm_access_t fSampleAccess;
 
             //channels
+            const char*  fCaptureName;
+            const char*  fPlaybackName;
             unsigned int fCardInputs;
             unsigned int fCardOutputs;
 
@@ -182,6 +184,8 @@ namespace Jack
                 fInputParams    = 0;
                 fOutputParams   = 0;
                 fPeriod = 2;
+                fCaptureName    = NULL;
+                fPlaybackName   = NULL;
 
                 fInputCardBuffer = 0;
                 fOutputCardBuffer = 0;
@@ -200,6 +204,8 @@ namespace Jack
             {
                 fInputCardBuffer = 0;
                 fOutputCardBuffer = 0;
+                fCaptureName    = NULL;
+                fPlaybackName   = NULL;
 
                 for ( int i = 0; i < 256; i++ )
                 {
@@ -216,8 +222,8 @@ namespace Jack
             int open()
             {
                 //open input/output streams
-                check_error ( snd_pcm_open ( &fInputDevice,  fCardName, SND_PCM_STREAM_CAPTURE, 0 ) );
-                check_error ( snd_pcm_open ( &fOutputDevice, fCardName, SND_PCM_STREAM_PLAYBACK, 0 ) );
+                check_error ( snd_pcm_open ( &fInputDevice,  (fCaptureName == NULL) ? fCardName : fCaptureName, SND_PCM_STREAM_CAPTURE, 0 ) );
+                check_error ( snd_pcm_open ( &fOutputDevice, (fPlaybackName == NULL) ? fCardName : fPlaybackName, SND_PCM_STREAM_PLAYBACK, 0 ) );
 
                 //get hardware input parameters
                 check_error ( snd_pcm_hw_params_malloc ( &fInputParams ) );

linux/alsa/JackAlsaDriver.cpp

@@ -859,10 +859,12 @@ SERVER_EXPORT Jack::JackDriverClientInterface* driver_initialize(Jack::JackLocke
                 break;
 
             case 'd':
-                playback_pcm_name = strdup (param->value.str);
-                capture_pcm_name = strdup (param->value.str);
-                jack_log("playback device %s", playback_pcm_name);
-                jack_log("capture device %s", capture_pcm_name);
+                if (strcmp (param->value.str, "none") != 0) {
+                    playback_pcm_name = strdup (param->value.str);
+                    capture_pcm_name = strdup (param->value.str);
+                    jack_log("playback device %s", playback_pcm_name);
+                    jack_log("capture device %s", capture_pcm_name);
+                }
                 break;
 
             case 'H':