winegstreamer: Allow wg_transform size changes with an explicit attribute.

dlls/winegstreamer/h264_decoder.c

@@ -89,6 +89,7 @@ static HRESULT try_create_wg_transform(struct h264_decoder *decoder)
     {
         .output_plane_align = 15,
         .input_queue_length = 15,
+        .allow_size_change = TRUE,
     };
     struct wg_format input_format;
     struct wg_format output_format;
@@ -106,12 +107,6 @@ static HRESULT try_create_wg_transform(struct h264_decoder *decoder)
     if (output_format.major_type == WG_MAJOR_TYPE_UNKNOWN)
         return MF_E_INVALIDMEDIATYPE;
 
-    /* Don't force any specific size, H264 streams already have the metadata for it
-     * and will generate a MF_E_TRANSFORM_STREAM_CHANGE result later.
-     */
-    output_format.u.video.width = 0;
-    output_format.u.video.height = 0;
-
     if (SUCCEEDED(IMFAttributes_GetUINT32(decoder->attributes, &MF_LOW_LATENCY, &low_latency)))
         attrs.low_latency = !!low_latency;
 
@@ -545,12 +540,6 @@ static HRESULT WINAPI transform_SetOutputType(IMFTransform *iface, DWORD id, IMF
         struct wg_format output_format;
         mf_media_type_to_wg_format(decoder->output_type, &output_format);
 
-        /* Don't force any specific size, H264 streams already have the metadata for it
-         * and will generate a MF_E_TRANSFORM_STREAM_CHANGE result later.
-         */
-        output_format.u.video.width = 0;
-        output_format.u.video.height = 0;
-
         if (output_format.major_type == WG_MAJOR_TYPE_UNKNOWN
                 || !wg_transform_set_output_format(decoder->wg_transform, &output_format))
         {

dlls/winegstreamer/unixlib.h

@@ -336,6 +336,7 @@ struct wg_transform_attrs
 {
     UINT32 output_plane_align;
     UINT32 input_queue_length;
+    BOOL allow_size_change;
     BOOL low_latency;
 };
 

dlls/winegstreamer/wg_transform.c

@@ -193,7 +193,11 @@ static GstCaps *transform_format_to_caps(struct wg_transform *transform, const s
     struct wg_format copy = *format;
 
     if (format->major_type == WG_MAJOR_TYPE_VIDEO)
+    {
+        if (transform->attrs.allow_size_change)
+            copy.u.video.width = copy.u.video.height = 0;
         copy.u.video.fps_n = copy.u.video.fps_d = 0;
+    }
 
     return wg_format_to_caps(&copy);
 }