winegstreamer: Allocate at least 3 buffers for MPEG audio in quartz parser.

dlls/winegstreamer/quartz_parser.c

@@ -1649,6 +1649,7 @@ static HRESULT WINAPI GSTOutPin_DecideBufferSize(struct strmbase_source *iface,
         IMemAllocator *allocator, ALLOCATOR_PROPERTIES *props)
 {
     struct parser_source *pin = impl_source_from_IPin(&iface->pin.IPin_iface);
+    unsigned int buffer_count = 1;
     unsigned int buffer_size = 16384;
     ALLOCATOR_PROPERTIES ret_props;
 
@@ -1664,11 +1665,18 @@ static HRESULT WINAPI GSTOutPin_DecideBufferSize(struct strmbase_source *iface,
         WAVEFORMATEX *format = (WAVEFORMATEX *)pin->pin.pin.mt.pbFormat;
         buffer_size = format->nAvgBytesPerSec;
     }
+    else if (IsEqualGUID(&pin->pin.pin.mt.subtype, &MEDIASUBTYPE_MPEG1AudioPayload)
+            || IsEqualGUID(&pin->pin.pin.mt.subtype, &MEDIASUBTYPE_MP3))
+    {
+        /* mpg123audiodec requires at least 3 buffers as it will keep
+         * references to the last 2 samples. */
+        buffer_count = 3;
+    }
 
     /* We do need to drop any buffers that might have been sent with the old
      * caps, but this will be handled in parser_init_stream(). */
 
-    props->cBuffers = max(props->cBuffers, 1);
+    props->cBuffers = max(props->cBuffers, buffer_count);
     props->cbBuffer = max(props->cbBuffer, buffer_size);
     props->cbAlign = max(props->cbAlign, 1);
     return IMemAllocator_SetProperties(allocator, props, &ret_props);