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| author | Lynne <dev@lynne.ee> | 2023-09-01 06:13:51 +0200 |
|---|---|---|
| committer | Lynne <dev@lynne.ee> | 2023-09-01 23:59:13 +0200 |
| commit | d40672e661037c770f50e45c8c09f523ed9a77d0 (patch) | |
| tree | ddbe23d9dc88028ce283634fe70b3abd29782ea4 | |
| parent | 59b39d241e3937f6c87cf68b7ca1e4cc69119347 (diff) | |
| download | ffmpeg-d40672e661037c770f50e45c8c09f523ed9a77d0.tar.gz | |
lavu/tx: fix scaling of R2R transforms
Still slightly inaccurate, but it's good enough now.
| -rw-r--r-- | libavutil/tx_template.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/libavutil/tx_template.c b/libavutil/tx_template.c index 4745b56700..6e3b3dad33 100644 --- a/libavutil/tx_template.c +++ b/libavutil/tx_template.c @@ -1613,6 +1613,7 @@ static av_cold int TX_NAME(ff_tx_rdft_init)(AVTXContext *s, int ret; double f, m; TXSample *tab; + uint64_t r2r = flags & AV_TX_REAL_TO_REAL; int len4 = FFALIGN(len, 4) / 4; s->scale_d = *((SCALE_TYPE *)scale); @@ -1638,7 +1639,10 @@ static av_cold int TX_NAME(ff_tx_rdft_init)(AVTXContext *s, *tab++ = RESCALE(-m); *tab++ = RESCALE( (0.5 - 0.0) * m); - *tab++ = RESCALE( (0.0 - 0.5) * m); + if (r2r) + *tab++ = 1 / s->scale_f; + else + *tab++ = RESCALE( (0.0 - 0.5) * m); *tab++ = RESCALE( (0.5 - inv) * m); *tab++ = RESCALE(-(0.5 - inv) * m); @@ -1804,7 +1808,7 @@ static void TX_NAME(ff_tx_rdft_ ##n)(AVTXContext *s, void *_dst, \ if (mode == AV_TX_REAL_TO_REAL) { \ out[len2] = tmp_dc; \ if (mod2) \ - out[len4 + 1] = tmp_mid; \ + out[len4 + 1] = tmp_mid * fact[5]; \ } else if (mod2) { \ out[len4] = tmp_mid; \ } \ |