[FFmpeg-devel] [PATCH] lavu: always provide symbols from hwcontext_vulkan.h

[Niklas Haas <ffmpeg@haasn.xyz>]

From: Niklas Haas <git@haasn.dev>

This header is unconditionally installed, even though the utility
functions defined by it may be missing from the built library.

A precedent set by e.g. libavcodec/qsv.h (and others) is to always
provide these functions by compiling stub functions in the absence of
CONFIG_*. Make hwcontext_vulkan.h match this convention.

Fixes downstream issues, e.g.
https://github.com/haasn/libplacebo/issues/120

Signed-off-by: Niklas Haas <git@haasn.dev>
---
 libavutil/Makefile           |  2 +-
 libavutil/hwcontext_vulkan.c | 26 ++++++++++++++++++++++++--
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/libavutil/Makefile b/libavutil/Makefile
index 29c170214c..66017a33a2 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -136,6 +136,7 @@ OBJS = adler32.o                                                        \
        hdr_dynamic_vivid_metadata.o                                     \
        hmac.o                                                           \
        hwcontext.o                                                      \
+       hwcontext_vulkan.o                                               \
        imgutils.o                                                       \
        integer.o                                                        \
        intmath.o                                                        \
@@ -194,7 +195,6 @@ OBJS-$(CONFIG_QSV)                      += hwcontext_qsv.o
 OBJS-$(CONFIG_VAAPI)                    += hwcontext_vaapi.o
 OBJS-$(CONFIG_VIDEOTOOLBOX)             += hwcontext_videotoolbox.o
 OBJS-$(CONFIG_VDPAU)                    += hwcontext_vdpau.o
-OBJS-$(CONFIG_VULKAN)                   += hwcontext_vulkan.o
 
 OBJS += $(COMPAT_OBJS:%=../compat/%)
 
diff --git a/libavutil/hwcontext_vulkan.c b/libavutil/hwcontext_vulkan.c
index 237caa4bc0..f7944a321c 100644
--- a/libavutil/hwcontext_vulkan.c
+++ b/libavutil/hwcontext_vulkan.c
@@ -16,6 +16,13 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stddef.h>
+
+#include "config.h"
+#include "pixdesc.h"
+
+#if CONFIG_VULKAN
+
 #define VK_NO_PROTOTYPES
 #define VK_ENABLE_BETA_EXTENSIONS
 
@@ -29,8 +36,6 @@
 
 #include <unistd.h>
 
-#include "config.h"
-#include "pixdesc.h"
 #include "avstring.h"
 #include "imgutils.h"
 #include "hwcontext.h"
@@ -4161,3 +4166,20 @@ const HWContextType ff_hwcontext_type_vulkan = {
         AV_PIX_FMT_NONE
     },
 };
+
+#else /* !CONFIG_VULKAN */
+
+struct AVVkFrame *av_vk_frame_alloc(void);
+const enum VkFormat *av_vkfmt_from_pixfmt(enum AVPixelFormat p);
+
+struct AVVkFrame *av_vk_frame_alloc(void)
+{
+    return NULL;
+}
+
+const enum VkFormat *av_vkfmt_from_pixfmt(enum AVPixelFormat p)
+{
+    return NULL;
+}
+
+#endif
-- 
2.36.1

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