X-Git-Url: https://git.gag.com/?a=blobdiff_plain;ds=sidebyside;f=gr-audio-alsa%2Fsrc%2Faudio_alsa_sink.cc;h=d44a93b3f37a44ccfb3635eeadf3419f6a8b9892;hb=64ee9a2973e6c217c54f8cb0433ab24b0e52e2cc;hp=c28e23fea64bfaa06e6800c752d1905e38963a9e;hpb=a8e58dba4d820e0b66d89bf05af29c381e46eef9;p=debian%2Fgnuradio

diff --git a/gr-audio-alsa/src/audio_alsa_sink.cc b/gr-audio-alsa/src/audio_alsa_sink.cc
index c28e23fe..d44a93b3 100644
--- a/gr-audio-alsa/src/audio_alsa_sink.cc
+++ b/gr-audio-alsa/src/audio_alsa_sink.cc
@@ -221,9 +221,15 @@ audio_alsa_sink::check_topology (int ninputs, int noutputs)
   int nchan = ninputs;
   int err;
 
-  // FIXME check_topology may be called more than once.
+  // Check the state of the stream
   // Ensure that the pcm is in a state where we can still mess with the hw_params
-
+  snd_pcm_state_t state;
+  state=snd_pcm_state(d_pcm_handle);
+  if ( state== SND_PCM_STATE_RUNNING)
+    return true;  // If stream is running, don't change any parameters
+  else if(state == SND_PCM_STATE_XRUN )
+    snd_pcm_prepare ( d_pcm_handle ); // Prepare stream on underrun, and we can set parameters;
+  
   bool special_case = nchan == 1 && d_special_case_mono_to_stereo;
   if (special_case)
     nchan = 2;