From: Lynne <dev@lynne.ee>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 1/2] lavu/tx: add real to real and real to imaginary RDFT transforms
Date: Thu, 3 Aug 2023 18:42:51 +0200 (CEST)
Message-ID: <NawGxLe--3-9@lynne.ee> (raw)
In-Reply-To: <NawD9Lq--3-9@lynne.ee-NawDDOJ----9>
Aug 3, 2023, 18:26 by dev@lynne.ee:
> These are in-place transforms, required for DCT-I and DST-I.
>
> Templated as the mod2 variant requires minor modifications, and is
> required specifically for DCT-I/DST-I.
>
> Quite optimized, as there's no need for any additional buffer storage.
>
Specifically, for R2R, vs fftw
26280 decicycles in av_tx (r2c), 1048574 runs, 2 skips
69940 decicycles in fftwf_execute, 1048576 runs, 0 skips
And for R2I
25856 decicycles in av_tx (r2c), 1048571 runs, 5 skips
65561 decicycles in fftwf_execute, 1048576 runs, 0 skips
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next prev parent reply other threads:[~2023-08-03 16:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-03 16:26 Lynne
[not found] ` <NawD9Lq--3-9@lynne.ee-NawDDOJ----9>
2023-08-03 16:31 ` [FFmpeg-devel] [PATCH 2/2] lavu/tx: add DCT-I and DST-I transforms Lynne
2023-08-03 16:42 ` Lynne [this message]
[not found] ` <NawGxLe--3-9@lynne.ee-NawH0-d----9>
2023-08-04 2:05 ` [FFmpeg-devel] [PATCH v2 1/2] lavu/tx: add real to real and real to imaginary RDFT transforms Lynne
2023-08-03 20:32 ` [FFmpeg-devel] [PATCH " Michael Niedermayer
2023-08-03 20:39 ` Andreas Rheinhardt
2023-08-04 2:04 ` Lynne
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