From d500eff3cce7ab0c6f7101860b633ca955a9f85e Mon Sep 17 00:00:00 2001
From: Lynne <dev@lynne.ee>
Date: Sat, 8 Feb 2020 23:06:09 +0000
Subject: [PATCH] lavu/tx: mention FFT output is not normalized

Not even FFTW's output is normalized.
This should prevent at least some users from complaining that doing a forward
transform followed by an inverse transform has a mismatching output to the
original input.
---
 libavutil/tx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavutil/tx.h b/libavutil/tx.h
index d6cdfdf9f2..8b405c0021 100644
--- a/libavutil/tx.h
+++ b/libavutil/tx.h
@@ -35,7 +35,7 @@ typedef struct AVComplexDouble {
 enum AVTXType {
     /**
      * Standard complex to complex FFT with sample data type AVComplexFloat.
-     * Scaling currently unsupported
+     * Output is not 1/len normalized. Scaling currently unsupported.
      */
     AV_TX_FLOAT_FFT = 0,
     /**
-- 
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