Midi input causes audio glitches.

src/AlsaDriver.cpp

@@ -1422,17 +1422,31 @@ namespace pipedal
                     }
 
                     // snd_pcm_wait(captureHandle, 1);
-
+                    ssize_t framesToRead = bufferSize;
-                    ssize_t framesRead;
+                    ssize_t framesRead = 0;
-                    if ((framesRead = ReadBuffer(captureHandle, this->rawCaptureBuffer, bufferSize)) < 0)
+                    bool xrun = false;
+                    while (framesToRead != 0)
+                    {
+                        ssize_t thisTime = framesToRead;
+                        ssize_t nFrames;
+                        if ((nFrames = ReadBuffer(
+                            captureHandle, 
+                            this->rawCaptureBuffer + this->captureFrameSize*framesRead, 
+                            bufferSize)) < 0)
                         {
                             this->driverHost->OnUnderrun();
                             auto state = snd_pcm_state(playbackHandle);
-                        XrunRecoverInputUnderrun(captureHandle, framesRead);
+                            XrunRecoverInputUnderrun(captureHandle, nFrames);
+                            xrun = true;
+                            break;
+                        }
+                        framesRead += nFrames;
+                        framesToRead -= nFrames; 
+                    }
+                    if (xrun)
+                    {
                         continue;
                     }
-                    else
-                    {
                     cpuUse.AddSample(ProfileCategory::Read);
                     if (framesRead == 0)
                         continue;
@@ -1462,7 +1476,6 @@ namespace pipedal
                     cpuUse.AddSample(ProfileCategory::Write);
                 }
             }
-            }
             catch (const std::exception &e)
             {
                 Lv2Log::error(e.what());