Fix buffering issues

mirror.c

@@ -261,6 +261,8 @@ bool mirror(IMMDevice *monitor, IMMDevice *output)
             break;
         }
  
+        for (;;)
+        {
             UINT32 padding = 0;
 
             if ((res = out_client->lpVtbl->GetCurrentPadding(out_client, &padding)) != S_OK)
@@ -284,23 +286,31 @@ bool mirror(IMMDevice *monitor, IMMDevice *output)
             UINT32 frames = 0;
             DWORD flags = 0;
      
-        if (packet_size > buffer_size - padding)
+            if (packet_size == 0)
             {
-            if ((res = capture->lpVtbl->GetBuffer(capture, &mon_data, &frames, &flags,
-                    NULL, NULL)) != S_OK)
+                // no input data, play silence
+
+                if ((res = render->lpVtbl->GetBuffer(render, buffer_size - padding, &out_data)) != S_OK)
                 {
-                fprintf(stderr, "Failed to get capture buffer of monitor client! [0x%08lx]\n", res);
+                    fprintf(stderr, "Failed to get render buffer of output client! [0x%08lx]\n", res);
                     goto out;
                 }
 
-            if ((res = capture->lpVtbl->ReleaseBuffer(capture, 0)) != S_OK)
+                if ((res = render->lpVtbl->ReleaseBuffer(render, buffer_size - padding,
+                        AUDCLNT_BUFFERFLAGS_SILENT)) != S_OK)
                 {
-                fprintf(stderr, "Failed to release capture buffer of monitor client! [0x%08lx]\n", res);
+                    fprintf(stderr, "Failed to release render buffer of output client! [0x%08lx]\n", res);
                     goto out;
                 }
 
+                break;
             }
-        else if (packet_size > 0)
+            else if (packet_size > buffer_size - padding)
+            {
+                // output buffer is full, we have to wait
+                break;
+            }
+            else
             {
                 if ((res = capture->lpVtbl->GetBuffer(capture, &mon_data, &frames, &flags,
                         NULL, NULL)) != S_OK)
@@ -329,20 +339,6 @@ bool mirror(IMMDevice *monitor, IMMDevice *output)
                     goto out;
                 }
             }
-        else
-        {
-            if ((res = render->lpVtbl->GetBuffer(render, buffer_size - padding, &out_data)) != S_OK)
-            {
-                fprintf(stderr, "Failed to get render buffer of output client! [0x%08lx]\n", res);
-                goto out;
-            }
-
-            if ((res = render->lpVtbl->ReleaseBuffer(render, buffer_size - padding,
-                    AUDCLNT_BUFFERFLAGS_SILENT)) != S_OK)
-            {
-                fprintf(stderr, "Failed to release render buffer of output client! [0x%08lx]\n", res);
-                goto out;
-            }
         }
     }