[FFmpeg-devel] [PATCH v2] avutil/channel_layout: make pre-defined channel layouts C++ friendly

[Zhao Zhili <quinkblack@foxmail.com>]

From: Zhao Zhili <zhilizhao@tencent.com>

C++ doesn't support designated initializers until C++20. We have
a bunch of pre-defined channel layouts, the gains to make them
usable in C++ exceed the losses.

Bump minor version so C++ project can check before use these defines.

Also initialize .opaque field explicitly to reduce warning in C++.
---
v2:
1. Keep field names in comments.
2. Bump minor version.
3. Add comments so it won't be reverted by accident.

 libavutil/channel_layout.h | 5 +++--
 libavutil/version.h        | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/libavutil/channel_layout.h b/libavutil/channel_layout.h
index f345415c55..f019b3d7ad 100644
--- a/libavutil/channel_layout.h
+++ b/libavutil/channel_layout.h
@@ -358,8 +358,9 @@ typedef struct AVChannelLayout {
     void *opaque;
 } AVChannelLayout;
 
+/* Don't use designated initializers since C++ doesn't support it until C++20. */
 #define AV_CHANNEL_LAYOUT_MASK(nb, m) \
-    { .order = AV_CHANNEL_ORDER_NATIVE, .nb_channels = (nb), .u = { .mask = (m) }}
+    { /* .order */ AV_CHANNEL_ORDER_NATIVE, /* .nb_channels */  (nb), /* .u.mask */ { m }, /* .opaque */ NULL }
 
 /**
  * @name Common pre-defined channel layouts
@@ -397,7 +398,7 @@ typedef struct AVChannelLayout {
 #define AV_CHANNEL_LAYOUT_STEREO_DOWNMIX    AV_CHANNEL_LAYOUT_MASK(2,  AV_CH_LAYOUT_STEREO_DOWNMIX)
 #define AV_CHANNEL_LAYOUT_22POINT2          AV_CHANNEL_LAYOUT_MASK(24, AV_CH_LAYOUT_22POINT2)
 #define AV_CHANNEL_LAYOUT_AMBISONIC_FIRST_ORDER \
-    { .order = AV_CHANNEL_ORDER_AMBISONIC, .nb_channels = 4, .u = { .mask = 0 }}
+    { /* .order */ AV_CHANNEL_ORDER_AMBISONIC, /* .nb_channels */ 4, /* .u.mask */ { 0 }, NULL }
 /** @} */
 
 struct AVBPrint;
diff --git a/libavutil/version.h b/libavutil/version.h
index 5a4d4d3d73..bc43baca9f 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,8 +79,8 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  58
-#define LIBAVUTIL_VERSION_MINOR  16
-#define LIBAVUTIL_VERSION_MICRO 101
+#define LIBAVUTIL_VERSION_MINOR  17
+#define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \
-- 
2.34.1

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