---
libavutil/pixdesc.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavutil/pixdesc.h b/libavutil/pixdesc.h
index c30ae1f..b4c01e2 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 formats has an alpha channel
+
+
#if FF_API_PIX_FMT_DESC
/**
* The array of all the pixel format descriptors.
--
1.7.12
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