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| author | Zhao Zhili <zhilizhao@tencent.com> | 2023-09-19 00:52:21 +0800 |
|---|---|---|
| committer | Zhao Zhili <zhilizhao@tencent.com> | 2023-09-19 00:52:21 +0800 |
| commit | ba9cd06c763648ecd1f447d7a672a0da85749d30 (patch) | |
| tree | 54cf82437066bdbf85681043cb2551f85ab6e176 /libavutil/avutil.h | |
| parent | 1c61aa1a02d66c2abf8365aae558fd5782c7a594 (diff) | |
| download | ffmpeg-ba9cd06c763648ecd1f447d7a672a0da85749d30.tar.gz | |
avutil/avutil: make AV_TIME_BASE_Q available in C++
ISO C++ forbids compound-literals. It's not available with MSVC.
This is a known issue from 10 years ago, and that's why there is a
av_get_time_base_q().
Since we have no plan to remove AV_TIME_BASE_Q, just make it
available in C++.
There are multiple choices:
1. Use C++11 syntax: AVRational{1, AV_TIME_BASE}
Users may still use C++98 to write new code. So no.
2. Use av_get_time_base_q().
It's for this purpose. But it's not compile time constants as
AV_TIME_BASE_Q in C.
So I choose av_make_q() as Anton's suggestion.
https://libav-devel.libav.narkive.com/ZQCWfTun/patch-0-2-fix-avutil-h-usage-from-c
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
Diffstat (limited to 'libavutil/avutil.h')
| -rw-r--r-- | libavutil/avutil.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libavutil/avutil.h b/libavutil/avutil.h index 30bec192f1..a362c8baa8 100644 --- a/libavutil/avutil.h +++ b/libavutil/avutil.h @@ -257,7 +257,12 @@ const char *av_get_media_type_string(enum AVMediaType media_type); * Internal time base represented as fractional value */ +#ifdef __cplusplus +/* ISO C++ forbids compound-literals. */ +#define AV_TIME_BASE_Q av_make_q(1, AV_TIME_BASE) +#else #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE} +#endif /** * @} |