Re: [FFmpeg-devel] [PATCHSET] AAC decoder refactor

[Lynne <dev@lynne.ee>]

Apr 22, 2024, 00:19 by michael@niedermayer.cc:

> On Fri, Apr 12, 2024 at 11:11:53AM +0200, Lynne wrote:
>
>> Apr 12, 2024, 00:45 by michael@niedermayer.cc:
>>
>> > On Thu, Apr 11, 2024 at 07:42:37AM +0200, Lynne wrote:
>> >
>> >> Apr 10, 2024, 23:57 by michael@niedermayer.cc:
>> >>
>> >> > On Wed, Apr 10, 2024 at 08:18:11PM +0200, Michael Niedermayer wrote:
>> >> >
>> >> >> On Wed, Apr 10, 2024 at 06:48:26PM +0200, Lynne wrote:
>> >> >> > Apr 8, 2024, 09:36 by dev@lynne.ee:
>> >> >> > 
>> >> >> > > The following patchset refactors the AAC decoder step by step,
>> >> >> > > removing all large-scale templating and abstracting away typed
>> >> >> > > DSP functions from symbol parsing.
>> >> >> > >
>> >> >> > > This series saves 110Kib of binary data from libavcodec.so
>> >> >> > > when compiled with Clang 18 with -O3, after stripping.
>> >> >> > >
>> >> >> > > The patchset can also be viewed here:
>> >> >> > > https://github.com/cyanreg/FFmpeg/tree/aac_cleanup
>> >> >> > >
>> >> >> > > Fate passes on each step, and I've been running this patchset for
>> >> >> > > a week with no issues.
>> >> >> > >
>> >> >> > > This also prepares the decoder for USAC support.
>> >> >> > >
>> >> >> > 
>> >> >> > I've rebased the linked repo to current git master if anyone
>> >> >> > wants to test.
>> >> >>
>> >> >> thanks, i will try to test it
>> >> >>
>> >> >
>> >> > make fate-source
>> >> >
>> >> > TEST    source
>> >> > --- ./tests/ref/fate/source	2024-04-08 18:26:00.670129617 +0200
>> >> > +++ tests/data/fate/source	2024-04-10 23:56:18.032896853 +0200
>> >> > @@ -22,6 +22,13 @@
>> >> >  compat/djgpp/math.h
>> >> >  compat/float/float.h
>> >> >  compat/float/limits.h
>> >> > +libavcodec/aac/aacdec.h
>> >> > +libavcodec/aac/aacdec_fixed_coupling.h
>> >> > +libavcodec/aac/aacdec_fixed_dequant.h
>> >> > +libavcodec/aac/aacdec_fixed_prediction.h
>> >> > +libavcodec/aac/aacdec_float_coupling.h
>> >> > +libavcodec/aac/aacdec_float_prediction.h
>> >> > +libavcodec/aac/aacdec_latm.h
>> >> >  libavcodec/bitstream_template.h
>> >> >  tools/decode_simple.h
>> >> >  Use of av_clip() where av_clip_uintp2() could be used:
>> >> > Test source failed. Look at tests/data/fate/source.err for details.
>> >> > tests/Makefile:310: recipe for target 'fate-source' failed
>> >> > make: *** [fate-source] Error 1
>> >> >
>> >>
>> >> Thanks for testing. Fixed both issues in the repo.
>> >> Was only testing with fate-aac while developing.
>> >>
>> >
>> > mips:
>> >
>> > make  -k
>> > LD	ffmpeg_g
>> > libavcodec/libavcodec.a(aacsbr.o): In function `ff_aac_sbr_ctx_alloc_init':
>> > aacsbr.c:(.text.unlikely+0x1d4): undefined reference to `ff_aacsbr_func_ptr_init_mips'
>> > aacsbr.c:(.text.unlikely+0x200): undefined reference to `ff_aacsbr_func_ptr_init_mips'
>> > libavcodec/libavcodec.a(sbrdsp.o): In function `ff_sbrdsp_init':
>> > sbrdsp.c:(.text.unlikely+0x10): undefined reference to `ff_sbrdsp_init_mips'
>> > sbrdsp.c:(.text.unlikely+0xb4): undefined reference to `ff_sbrdsp_init_mips'
>> > libavcodec/libavcodec.a(aacpsdsp_float.o): In function `ff_psdsp_init':
>> > aacpsdsp_float.c:(.text.unlikely+0x10): undefined reference to `ff_psdsp_init_mips'
>> > aacpsdsp_float.c:(.text.unlikely+0x6c): undefined reference to `ff_psdsp_init_mips'
>> > collect2: error: ld returned 1 exit status
>> > Makefile:136: recipe for target 'ffmpeg_g' failed
>> > make: *** [ffmpeg_g] Error 1
>> > LD	ffprobe_g
>> > libavcodec/libavcodec.a(aacsbr.o): In function `ff_aac_sbr_ctx_alloc_init':
>> > aacsbr.c:(.text.unlikely+0x1d4): undefined reference to `ff_aacsbr_func_ptr_init_mips'
>> > aacsbr.c:(.text.unlikely+0x200): undefined reference to `ff_aacsbr_func_ptr_init_mips'
>> > libavcodec/libavcodec.a(sbrdsp.o): In function `ff_sbrdsp_init':
>> > sbrdsp.c:(.text.unlikely+0x10): undefined reference to `ff_sbrdsp_init_mips'
>> > sbrdsp.c:(.text.unlikely+0xb4): undefined reference to `ff_sbrdsp_init_mips'
>> > libavcodec/libavcodec.a(aacpsdsp_float.o): In function `ff_psdsp_init':
>> > aacpsdsp_float.c:(.text.unlikely+0x10): undefined reference to `ff_psdsp_init_mips'
>> > aacpsdsp_float.c:(.text.unlikely+0x6c): undefined reference to `ff_psdsp_init_mips'
>> > collect2: error: ld returned 1 exit status
>> > Makefile:136: recipe for target 'ffprobe_g' failed
>> > make: *** [ffprobe_g] Error 1
>> > make: Target 'all' not remade because of errors.
>> >
>>
>> Fixed. This should be all.
>> On the Loongson machine I have access to, I can't compile FFmpeg
>> due to missing asm/errno.h kernel header, while on the standard MIPS64
>> machine I can access, compilation worked either way.
>>
>> Would you mind testing again the new version in the repo?
>>
>
> it works on my qemu based mips. I did give the loongson to anton 2 years ago
> so i have no native loongson to test it with
>

Thanks. That sounds good enough for me, really the main
potential issue I see with this is that it changes the way files
are organized to be more like the VVC decoder.
Since no one seems bothered by that, I'll move on with pushing
this tomorrow.
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