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.
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,
/**