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-rw-r--r--libavutil/pixdesc.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libavutil/pixdesc.h b/libavutil/pixdesc.h
index a944c66dd3..47e6bb838d 100644
--- a/libavutil/pixdesc.h
+++ b/libavutil/pixdesc.h
@@ -96,6 +96,9 @@ typedef struct AVPixFmtDescriptor{
*/
#define PIX_FMT_PSEUDOPAL 64
+#define PIX_FMT_ALPHA 128 ///< The pixel format has an alpha channel
+
+
#if FF_API_PIX_FMT_DESC
/**
* The array of all the pixel format descriptors.