Anton Baskanov : quartz/dsoundrender: Don't let writepos advance past playpos.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 9b30d0928285e7fd5620a0104a82233990d2bb9d
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=9b30d0928285e7fd5620a0104...

Author: Anton Baskanov 
Date:   Mon Apr 26 09:51:23 2021 +0700

quartz/dsoundrender: Don't let writepos advance past playpos.

Fixes audio stuttering during video playback in multiple games (e.g.
Commandos 2, Alien Nations, Dino Crisis Demo).

Signed-off-by: Anton Baskanov 
Signed-off-by: Zebediah Figura 
Signed-off-by: Alexandre Julliard

---

dlls/quartz/dsoundrender.c       | 5 +----
 dlls/quartz/tests/dsoundrender.c | 2 +-
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/dlls/quartz/dsoundrender.c b/dlls/quartz/dsoundrender.c
index 6c6732e468a..f7f0255d4ab 100644
--- a/dlls/quartz/dsoundrender.c
+++ b/dlls/quartz/dsoundrender.c
@@ -149,7 +149,6 @@ static void DSoundRender_UpdatePositions(struct dsound_render *This, DWORD *seqw
 static HRESULT DSoundRender_GetWritePos(struct dsound_render *This,
         DWORD *ret_writepos, REFERENCE_TIME write_at, DWORD *pfree, DWORD *skip)
 {
-    WAVEFORMATEX *wfx = (WAVEFORMATEX *)This->sink.pin.mt.pbFormat;
     DWORD writepos, min_writepos, playpos;
     REFERENCE_TIME max_lag = 50 * 10000;
     REFERENCE_TIME cur, writepos_t, delta_t;
@@ -212,10 +211,8 @@ static HRESULT DSoundRender_GetWritePos(struct dsound_render *This,
         *ret_writepos = (min_writepos + aheadbytes) % This->buf_size;
     }
 end:
-    if (playpos > *ret_writepos)
+    if (playpos >= *ret_writepos)
         *pfree = playpos - *ret_writepos;
-    else if (playpos == *ret_writepos)
-        *pfree = This->buf_size - wfx->nBlockAlign;
     else
         *pfree = This->buf_size + playpos - *ret_writepos;
     if (time_from_pos(This, This->buf_size - *pfree) >= DSoundRenderer_Max_Fill) {
diff --git a/dlls/quartz/tests/dsoundrender.c b/dlls/quartz/tests/dsoundrender.c
index c33c074d93d..e591e1832d5 100644
--- a/dlls/quartz/tests/dsoundrender.c
+++ b/dlls/quartz/tests/dsoundrender.c
@@ -737,7 +737,7 @@ static HRESULT send_frame(IMemInputPin *sink)
     params->sink = sink;
     params->sample = sample;
     thread = CreateThread(NULL, 0, frame_thread, params, 0, NULL);
-    ret = WaitForSingleObject(thread, 500);
+    ret = WaitForSingleObject(thread, 2000);
     todo_wine_if (ret) ok(!ret, "Wait failed.\n");
     GetExitCodeThread(thread, &ret);
     CloseHandle(thread);