Re: [FFmpeg-devel] [PATCH v24 6/9] avformat/mov_muxer: Extended MOV muxer to handle EVC video content

["Dawid Kozinski/Multimedia \(PLT\) /SRPOL/Staff Engineer/Samsung Electronics" <d.kozinski@samsung.com>]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Michael Niedermayer
> Sent: środa, 14 czerwca 2023 02:23
> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [PATCH v24 6/9] avformat/mov_muxer: Extended
> MOV muxer to handle EVC video content
> 
> On Mon, Jun 12, 2023 at 02:30:27PM +0200, Dawid Kozinski wrote:
> > - Changes in mov_write_video_tag function to handle EVC elementary
> > stream
> > - Provided structure EVCDecoderConfigurationRecord that specifies the
> > decoder configuration information for ISO/IEC 23094-1 video content
> >
> > Signed-off-by: Dawid Kozinski <d.kozinski@samsung.com>
> > ---
> >  libavformat/Makefile    |   2 +-
> >  libavformat/evc.c       | 422 ++++++++++++++++++++++++++++++++++++++++
> >  libavformat/evc.h       |  44 +++++
> >  libavformat/isom_tags.c |   2 +
> >  libavformat/movenc.c    |  33 ++++
> >  5 files changed, 502 insertions(+), 1 deletion(-)  create mode 100644
> > libavformat/evc.c  create mode 100644 libavformat/evc.h
> >
> > diff --git a/libavformat/Makefile b/libavformat/Makefile index
> > 6e4231fda2..d3503196e3 100644
> > --- a/libavformat/Makefile
> > +++ b/libavformat/Makefile
> > @@ -364,7 +364,7 @@ OBJS-$(CONFIG_MOV_DEMUXER)               += mov.o
> mov_chan.o mov_esds.o \
> >  OBJS-$(CONFIG_MOV_MUXER)                 += movenc.o av1.o avc.o hevc.o
> vpcc.o \
> >                                              movenchint.o mov_chan.o
rtp.o \
> >                                              movenccenc.o movenc_ttml.o
rawutils.o \
> > -                                            dovi_isom.o
> > +                                            dovi_isom.o evc.o
> >  OBJS-$(CONFIG_MP2_MUXER)                 += rawenc.o
> >  OBJS-$(CONFIG_MP3_DEMUXER)               += mp3dec.o replaygain.o
> >  OBJS-$(CONFIG_MP3_MUXER)                 += mp3enc.o rawenc.o
id3v2enc.o
> > diff --git a/libavformat/evc.c b/libavformat/evc.c new file mode
> > 100644 index 0000000000..431cb107e3
> > --- /dev/null
> > +++ b/libavformat/evc.c
> > @@ -0,0 +1,422 @@
> > +/*
> > + * EVC helper functions for muxers
> > + * Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
> > + *
> > + * This file is part of FFmpeg.
> > + *
> > + * FFmpeg is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU Lesser General Public
> > + * License as published by the Free Software Foundation; either
> > + * version 2.1 of the License, or (at your option) any later version.
> > + *
> > + * FFmpeg is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > + * Lesser General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU Lesser General Public
> > + * License along with FFmpeg; if not, write to the Free Software
> > + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
> > +02110-1301 USA  */
> 
> [...]
> 
> > +        nalu_type = ff_evc_get_nalu_type(data, bytes_to_read, pb);
> 
> functions shared between libavcodec and libavformat need an av*/avpriv*
> prefix otherwise linking will fail with shared libs as ff* isnt exported
> 
Michael, thank you for your code review.
I've just pushed new patchset (v25) that fixes prefixes for functions shared
between libavcoded and libavformat.

> 
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
> 
> Many that live deserve death. And some that die deserve life. Can you give
it to
> them? Then do not be too eager to deal out death in judgement. For even
the
> very wise cannot see all ends. -- Gandalf


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