WasapiOutputPlugin pause bug fix

Wasapi output plugin won't start playing after being paused The cause is that the scope guard in the WASAPI work thread (WasapiOutputPlugin.cxx, function WasapiOutputThread::Work(), in the while (true) loop) is set up too 'late' in the execution. There is one condition ("if (data_in_frames >= buffer_size_in_frames)") when it is hit, the loop will continue without executing the scope guard. This scope guard is responsible for emptying the buffer again, and if the buffer is not emptied, the above mentioned condition will stay true. Closes https://github.com/MusicPlayerDaemon/MPD/issues/1451

WasapiOutputPlugin pause bug fix
aeaef855 · Richard Schorrig · Max Kellermann · ebae25d1 · aeaef855 · aeaef855
Commit aeaef855 authored Feb 22, 2022 by Richard Schorrig Committed by Max Kellermann Mar 14, 2022
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Showing with 11 additions and 10 deletions

NEWS NEWS +1 -0

WasapiOutputPlugin.cxx src/output/plugins/wasapi/WasapiOutputPlugin.cxx +10 -10

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--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,7 @@ ver 0.23.6 (not yet released)
  - opus: fix "readpicture" on Opus files
 * output
  - pipewire: fix crash bug if setting volume before playback starts
+  - wasapi: fix resume after pause

 ver 0.23.5 (2021/12/01)
 * protocol

--- a/src/output/plugins/wasapi/WasapiOutputPlugin.cxx
+++ b/src/output/plugins/wasapi/WasapiOutputPlugin.cxx
@@ -471,6 +471,16 @@ try {
 		}

 		UINT32 write_in_frames = buffer_size_in_frames;
+		DWORD mode = 0;
+		AtScopeExit(&) {
+			render_client->ReleaseBuffer(write_in_frames, mode);
+
+			if (!started) {
+				Start(client);
+				started = true;
+			}
+		};
+
 		if (!is_exclusive) {
 			UINT32 data_in_frames =
 				GetCurrentPaddingFrames(client);
@@ -481,7 +491,6 @@ try {
 		}

 		BYTE *data;
-		DWORD mode = 0;

 		if (HRESULT result =
 		    render_client->GetBuffer(write_in_frames, &data);
@@ -489,15 +498,6 @@ try {
 			throw MakeHResultError(result, "Failed to get buffer");
 		}

-		AtScopeExit(&) {
-			render_client->ReleaseBuffer(write_in_frames, mode);
-
-			if (!started) {
-				Start(client);
-				started = true;
-			}
-		};
-
 		const UINT32 write_size = write_in_frames * frame_size;
 		UINT32 new_data_size = 0;
 		new_data_size = spsc_buffer.pop(data, write_size);