[FFmpeg-cvslog] lavu/tx: improve rdft table generation precision slightly

[Lynne]

ffmpeg | branch: master | Lynne <dev at lynne.ee> | Fri Sep  1 06:06:44 2023 +0200| [59b39d241e3937f6c87cf68b7ca1e4cc69119347] | committer: Lynne

lavu/tx: improve rdft table generation precision slightly

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=59b39d241e3937f6c87cf68b7ca1e4cc69119347
---

 libavutil/tx_template.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavutil/tx_template.c b/libavutil/tx_template.c
index c026cb40c4..4745b56700 100644
--- a/libavutil/tx_template.c
+++ b/libavutil/tx_template.c
@@ -1648,7 +1648,7 @@ static av_cold int TX_NAME(ff_tx_rdft_init)(AVTXContext *s,
     tab = ((TXSample *)s->exp) + len4 + 8;
 
     for (int i = 0; i < len4; i++)
-        *tab++ = RESCALE(cos(((float)len/4.0 - (float)i + 0)*f) * (inv ? +1.0 : -1.0));
+        *tab++ = RESCALE(cos(((len - i*4)/4.0)*f)) * (inv ? 1 : -1);
 
     return 0;
 }