vajpegdec: Enhance explanation comment.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2948>

diff --git a/subprojects/gst-plugins-bad/sys/va/gstvajpegdec.c b/subprojects/gst-plugins-bad/sys/va/gstvajpegdec.c
index 90090189d287f5c67b5d79c77fd16adb87cbaba7..cfb0d8aff1c2d7c71c889ccdc6f599cbda983aae 100644 (file)
--- a/subprojects/gst-plugins-bad/sys/va/gstvajpegdec.c
+++ b/subprojects/gst-plugins-bad/sys/va/gstvajpegdec.c
@@ -383,7 +383,8 @@ gst_va_jpeg_dec_negotiate (GstVideoDecoder * decoder)
   if (base->output_state)
     gst_video_codec_state_unref (base->output_state);
 
-  /* hack for RGBP rt_format */
+  /* hack for RGBP rt_format, because only RGBP is exposed as pixel
+   * format */
   if (base->rt_format == RT_FORMAT_RGB)
     base->rt_format = VA_RT_FORMAT_RGBP;