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

["zhilizhao(赵志立)"]

> 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
>>> Haihao
>>> 
>>>> 
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