[PATCH 2/3] evr/presenter: Place early samples back to the front of the queue.

[Nikolay Sivov]

From: Andrew Eikum

Signed-off-by: Nikolay Sivov 
---
 dlls/evr/presenter.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/dlls/evr/presenter.c b/dlls/evr/presenter.c
index 1b119ce9cab..e70e25a19a7 100644
--- a/dlls/evr/presenter.c
+++ b/dlls/evr/presenter.c
@@ -429,15 +429,20 @@ static HRESULT video_presenter_sample_queue_init(struct video_presenter *present
     return S_OK;
 }

-static void video_presenter_sample_queue_push(struct video_presenter *presenter, IMFSample *sample)
+static void video_presenter_sample_queue_push(struct video_presenter *presenter, IMFSample *sample,
+        BOOL at_front)
 {
     struct sample_queue *queue = &presenter->thread.queue;
+    unsigned int idx;

EnterCriticalSection(&presenter->cs);
     if (queue->used != queue->size)
     {
-        queue->back = (queue->back + 1) % queue->size;
-        queue->samples[queue->back] = sample;
+        if (at_front)
+            idx = queue->front = (queue->size + queue->front - 1) % queue->size;
+        else
+            idx = queue->back = (queue->back + 1) % queue->size;
+        queue->samples[idx] = sample;
         queue->used++;
         IMFSample_AddRef(sample);
     }
@@ -556,7 +561,7 @@ static void video_presenter_check_queue(struct video_presenter *presenter,
         if (present)
             video_presenter_sample_present(presenter, sample);
         else
-            video_presenter_sample_queue_push(presenter, sample);
+            video_presenter_sample_queue_push(presenter, sample, TRUE);

IMFSample_Release(sample);

@@ -580,7 +585,7 @@ static void video_presenter_schedule_sample(struct video_presenter *presenter, I

if (presenter->clock)
     {
-        video_presenter_sample_queue_push(presenter, sample);
+        video_presenter_sample_queue_push(presenter, sample, FALSE);
         PostThreadMessageW(presenter->thread.tid, EVRM_PRESENT, 0, 0);
     }
     else