From: Zhao Zhili <zhiliz...@tencent.com>
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 <zhiliz...@tencent.com>
---
doc/APIchanges | 3 +++
libavutil/avutil.h | 5 +++++
libavutil/version.h | 2 +-
3 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/doc/APIchanges b/doc/APIchanges
index ad1efe708d..233c53b04a 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2023-02-09
API changes, most recent first:
+2023-08-28 - xxxxxxxxxx - lavu 58.18.100 - avutil.h
+ Make AV_TIME_BASE_Q compatible with C++.
+
2023-08-18 - xxxxxxxxxx - lavu 58.17.100 - channel_layout.h
All AV_CHANNEL_LAYOUT_* macros are now compatible with C++ 17 and older.
diff --git a/libavutil/avutil.h b/libavutil/avutil.h
index 64b68bdbd3..48e54e25b9 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
/**
* @}
diff --git a/libavutil/version.h b/libavutil/version.h
index bc43baca9f..6d27f91cce 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 58
-#define LIBAVUTIL_VERSION_MINOR 17
+#define LIBAVUTIL_VERSION_MINOR 18
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
--
2.25.1
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