[FFmpeg-devel] [PATCH v3 0/8] add fd protocol

[Xiang, Haihao]

On Wo, 2023-01-11 at 17:10 +0800, zhilizhao(赵志立) wrote:
> > On Jan 11, 2023, at 16:52, Paul B Mahol <onemda at gmail.com> wrote:
> > 
> > On 1/11/23, "zhilizhao(赵志立)" <quinkblack at foxmail.com> wrote:
> > > 
> > > > On Jan 11, 2023, at 15:53, Xiang, Haihao
> > > > <haihao.xiang-at-intel.com at ffmpeg.org> wrote:
> > > > 
> > > > On Wo, 2023-01-11 at 11:18 +0800, zhilizhao(赵志立) wrote:
> > > > > > On Jan 9, 2023, at 11:17, zhilizhao(赵志立) <quinkblack at foxmail.com>
> > > > > > wrote:
> > > > > > 
> > > > > > > On Dec 15, 2022, at 01:10, Zhao Zhili <quinkblack at foxmail.com>
> > > > > > > wrote:
> > > > > > > 
> > > > > > > From: Zhao Zhili <zhilizhao at tencent.com>
> > > > > > > 
> > > > > > > v2:
> > > > > > > 1. Forbid pass file descriptor via fd:{num}, instead of -fd option
> > > > > > > 2. Set CLOEXEC
> > > > > > > 3. Prefer fd over pipe for fftools
> > > > > > > 
> > > > > > > v1: dup file descriptor
> > > > > > > 
> > > > > > > Zhao Zhili (8):
> > > > > > > avformat/file: add fd option for pipe
> > > > > > > avformat/file: reindent after the previous commit
> > > > > > > avformat/file: dup file descriptor for pipe
> > > > > > > avformat/file: add fd protocol
> > > > > > > fftools/ffmpeg_demux: disable stdin interaction for fd protocol
> > > > > > > fftools/ffplay: prefer fd over pipe for seek support
> > > > > > > fftools/ffprobe: prefer fd over pipe for seek support
> > > > > > > fftools/ffmpeg_demux: prefer fd over pipe for seek support
> > > > > > > 
> > > > > > > doc/protocols.texi      |  31 +++++++-
> > > > > > > fftools/ffmpeg_demux.c  |   3 +-
> > > > > > > fftools/ffplay.c        |   2 +-
> > > > > > > fftools/ffprobe.c       |   4 +-
> > > > > > > libavformat/Makefile    |   1 +
> > > > > > > libavformat/file.c      | 152 +++++++++++++++++++++++++++++++-----
> > > > > > > ----
> > > > > > > libavformat/protocols.c |   1 +
> > > > > > > libavformat/version.h   |   4 +-
> > > > > > > 8 files changed, 156 insertions(+), 42 deletions(-)
> > > > > > 
> > > > > > Will apply soon unless there are objections.
> > > > > 
> > > > > Pushed.
> > > > 
> > > > It caused link error on Windows
> > > > 
> > > > INFO  - LD    libavformat/avformat-59.dll
> > > > INFO  -    Creating library libavformat/avformat.lib and object
> > > > libavformat/avformat.exp
> > > > INFO  - file.o : error LNK2019: unresolved external symbol S_ISREG
> > > > referenced in
> > > > function fd_open
> > > > INFO  - file.o : error LNK2019: unresolved external symbol S_ISBLK
> > > > referenced in
> > > > function fd_open
> > > > INFO  - libavformat\avformat-59.dll : fatal error LNK1120: 2 unresolved
> > > > externals
> > > 
> > > Sorry for the break, I’m trying to figure out how to make it compatible
> > > with Windows.
> > 
> > Is this even portable?
> 
> fstat and the macros are defined by POSIX. Windows doesn’t provide S_ISREG
> or S_ISBLK, but it does provide S_IFREG. So the compatability macro S_ISREG()
> should work. For S_ISBLK(), it’s always false on Windows which shouldn’t be
> an issue.
> 
> http://ffmpeg.org/pipermail/ffmpeg-devel/2023-January/305545.html

Thanks for your quick fix, the error went away after applying this patch.

- Haihao

> 
> > > > Thanks
> > > > Haihao
> > > > 
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