From: Nuo Mi <nuomi2021@gmail.com>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 01/14] vvcdec: add thread executor
Date: Sun, 21 May 2023 23:03:50 +0800
Message-ID: <CAFXK13eb+mfxShnbPcT8ifmFREdEn0QPV=K+88gCBjycYRNyEA@mail.gmail.com> (raw)
In-Reply-To: <NVyda7m--3-9@lynne.ee>
On Sun, May 21, 2023 at 10:11 PM Lynne <dev@lynne.ee> wrote:
> May 21, 2023, 15:03 by nuomi2021@gmail.com:
>
> > The executor design pattern was inroduced by java
> > <
> https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/util/concurrent/Executor.html
> >
> > it also adapted by python
> > <https://docs.python.org/3/library/concurrent.futures.html>
> > Compared to handcrafted thread pool management, it greatly simplifies
> the thread code.
> > ---
> > libavcodec/Makefile | 1 +
> > libavcodec/vvc/Makefile | 4 +
> > libavcodec/vvc/vvc_executor.c | 193 ++++++++++++++++++++++++++++++++++
> > libavcodec/vvc/vvc_executor.h | 73 +++++++++++++
> > 4 files changed, 271 insertions(+)
> > create mode 100644 libavcodec/vvc/Makefile
> > create mode 100644 libavcodec/vvc/vvc_executor.c
> > create mode 100644 libavcodec/vvc/vvc_executor.h
> >
>
> I'd like a unified API, since for AV1, we'd want something similar.
> Having a custom one for each codec is a bad idea and prone to bitrotting.
>
Hi Lynne,
Thanks for the comment.
dav1d has not merged to mainline yet.
It uses the same idea, but all codes are hand-crafted. Did not use any
existing patterns.
I guess the executor will simplify the dav1d's code.
Let us find out when it is sent to FFmpeg for review.
Current ffmpeg's thread management has limitations:
1. Slice thread bound to frame, it can't not us by another frame even
current frame has no job.
2. It is a one-shot mechanism. Can't support multi-stage decoder. So it
can't fully use the multiple cores.
This is why we need a new one.
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next prev parent reply other threads:[~2023-05-21 15:04 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-21 13:03 [FFmpeg-devel] [PATCH 00/14] add vvc decoder c code Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 01/14] vvcdec: add thread executor Nuo Mi
2023-05-21 13:15 ` Rémi Denis-Courmont
2023-05-21 14:24 ` Nuo Mi
2023-05-22 16:29 ` Rémi Denis-Courmont
2023-05-23 6:23 ` Nuo Mi
2023-05-21 14:44 ` Nuo Mi
2023-05-21 14:11 ` Lynne
2023-05-21 15:03 ` Nuo Mi [this message]
2023-05-21 15:06 ` Lynne
2023-05-21 15:16 ` Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 02/14] vvcdec: add vvc decoder stub Nuo Mi
2023-05-21 17:30 ` Michael Niedermayer
2023-05-22 1:55 ` Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 03/14] vvcdec: add sps, pps, sh parser Nuo Mi
2023-05-21 14:25 ` James Almer
2023-06-10 11:37 ` Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 04/14] vvcdec: add cabac decoder Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 05/14] vvcdec: add reference management Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 06/14] vvcdec: add motion vector decoder Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 07/14] vvcdec: add inter prediction Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 08/14] vvcdec: add inv transform 1d Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 09/14] vvcdec: add intra prediction Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 10/14] vvcdec: add LMCS, Deblocking, SAO, and ALF filters Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 11/14] vvcdec: add dsp init and inv transform Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 12/14] vvcdec: add CTU(Coding Tree Unit) parser Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 13/14] vvcdec: add CTU thread logical Nuo Mi
2023-05-21 13:03 ` [FFmpeg-devel] [PATCH 14/14] vvcdec: add full vvc decoder Nuo Mi
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