winegstreamer: Read into an existing buffer if requested.

oggdemux needs this. Signed-off-by: Zebediah Figura <zfigura@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

winegstreamer: Read into an existing buffer if requested.
d61504f1 · Zebediah Figura · Alexandre Julliard · c9f0d862 · d61504f1
Commit d61504f1 authored Mar 10, 2020 by Zebediah Figura Committed by Alexandre Julliard Mar 11, 2020
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gstdemux.c dlls/winegstreamer/gstdemux.c +2 -2

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--- a/dlls/winegstreamer/gstdemux.c
+++ b/dlls/winegstreamer/gstdemux.c
@@ -896,9 +896,8 @@ static GstFlowReturn request_buffer_src(GstPad *pad, GstObject *parent, guint64 
    HRESULT hr;
    GstMapInfo info;
-    TRACE("%p %s %i %p\n", pad, wine_dbgstr_longlong(ofs), len, buf);
+    TRACE("pad %p, offset %s, length %u, buffer %p.\n", pad, wine_dbgstr_longlong(ofs), len, *buf);
-    *buf = NULL;
    if (ofs == GST_BUFFER_OFFSET_NONE)
        ofs = This->nextpullofs;
    if (ofs >= This->filesize) {
@@ -909,6 +908,7 @@ static GstFlowReturn request_buffer_src(GstPad *pad, GstObject *parent, guint64 
        len = This->filesize - ofs;
    This->nextpullofs = ofs + len;
+    if (!*buf)
        *buf = gst_buffer_new_and_alloc(len);
    gst_buffer_map(*buf, &info, GST_MAP_WRITE);
    hr = IAsyncReader_SyncRead(This->reader, ofs, len, info.data);