avcodec/vdpau: Deprecate redundant allocators and getter/setter

The allocators have been superseded by av_vdpau_bind_context().
The latter have only been added "to allow multiple forks to add
fields to the structure without breaking ABI" [1], but libav
is no more, so this is not needed any longer.

[1]: https://ffmpeg.org/pipermail/ffmpeg-devel/2013-August/146954.html

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

4 files changed, 32 insertions, 5 deletions

diff --git a/doc/APIchanges b/doc/APIchanges
index 4f7612e449..71cd6ece34 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -2,6 +2,12 @@ The last version increases of all libraries were on 2024-03-07
 
 API changes, most recent first:
 
+2024-03-08 - xxxxxxxxxx - lavc 61.0.100 - vdpau.h
+  Deprecate av_vdpau_alloc_context(), av_alloc_vdpaucontext(),
+  av_vdpau_hwaccel_get_render2() and av_vdpau_hwaccel_set_render2().
+  The former are superseded by av_vdpau_bind_context(), the latter
+  are unneeded as the relevant field is public and can be accessed directly.
+
 2024-03-06 - xxxxxxxxxx - lavf 60.25.100 - avformat.h
   Deprecate av_fmt_ctx_get_duration_estimation_method().
   The relevant field is public and needs no getter to access.
diff --git a/libavcodec/vdpau.c b/libavcodec/vdpau.c
index c56ee1f44c..538c57f9e8 100644
--- a/libavcodec/vdpau.c
+++ b/libavcodec/vdpau.c
@@ -64,15 +64,19 @@ static int vdpau_error(VdpStatus status)
     }
 }
 
+#if FF_API_VDPAU_ALLOC_GET_SET
 AVVDPAUContext *av_alloc_vdpaucontext(void)
 {
+FF_DISABLE_DEPRECATION_WARNINGS
     return av_vdpau_alloc_context();
+FF_ENABLE_DEPRECATION_WARNINGS
 }
 
 #define MAKE_ACCESSORS(str, name, type, field) \
     type av_##name##_get_##field(const str *s) { return s->field; } \
     void av_##name##_set_##field(str *s, type v) { s->field = v; }
 MAKE_ACCESSORS(AVVDPAUContext, vdpau_hwaccel, AVVDPAU_Render2, render2)
+#endif
 
 int av_vdpau_get_surface_parameters(AVCodecContext *avctx,
                                     VdpChromaType *type,
@@ -400,10 +404,12 @@ int ff_vdpau_add_buffer(struct vdpau_picture_context *pic_ctx,
     return 0;
 }
 
+#if FF_API_VDPAU_ALLOC_GET_SET
 AVVDPAUContext *av_vdpau_alloc_context(void)
 {
     return av_mallocz(sizeof(VDPAUHWContext));
 }
+#endif
 
 int av_vdpau_bind_context(AVCodecContext *avctx, VdpDevice device,
                           VdpGetProcAddress *get_proc, unsigned flags)
diff --git a/libavcodec/vdpau.h b/libavcodec/vdpau.h
index 35c4b1096b..8021c25761 100644
--- a/libavcodec/vdpau.h
+++ b/libavcodec/vdpau.h
@@ -66,16 +66,14 @@ typedef int (*AVVDPAU_Render2)(struct AVCodecContext *, struct AVFrame *,
 /**
  * This structure is used to share data between the libavcodec library and
  * the client video application.
- * The user shall allocate the structure via the av_alloc_vdpau_hwaccel
- * function and make it available as
- * AVCodecContext.hwaccel_context. Members can be set by the user once
+ * This structure will be allocated and stored in AVCodecContext.hwaccel_context
+ * by av_vdpau_bind_context(). Members can be set by the user once
  * during initialization or through each AVCodecContext.get_buffer()
  * function call. In any case, they must be valid prior to calling
  * decoding functions.
  *
  * The size of this structure is not a part of the public ABI and must not
- * be used outside of libavcodec. Use av_vdpau_alloc_context() to allocate an
- * AVVDPAUContext.
+ * be used outside of libavcodec.
  */
 typedef struct AVVDPAUContext {
     /**
@@ -95,15 +93,27 @@ typedef struct AVVDPAUContext {
     AVVDPAU_Render2 render2;
 } AVVDPAUContext;
 
+#if FF_API_VDPAU_ALLOC_GET_SET
 /**
  * @brief allocation function for AVVDPAUContext
  *
  * Allows extending the struct without breaking API/ABI
+ * @deprecated use av_vdpau_bind_context() instead
  */
+attribute_deprecated
 AVVDPAUContext *av_alloc_vdpaucontext(void);
 
+/**
+ * @deprecated render2 is public and can be accessed directly
+ */
+attribute_deprecated
 AVVDPAU_Render2 av_vdpau_hwaccel_get_render2(const AVVDPAUContext *);
+/**
+ * @deprecated render2 is public and can be accessed directly
+ */
+attribute_deprecated
 void av_vdpau_hwaccel_set_render2(AVVDPAUContext *, AVVDPAU_Render2);
+#endif
 
 /**
  * Associate a VDPAU device with a codec context for hardware acceleration.
@@ -145,12 +155,16 @@ int av_vdpau_bind_context(AVCodecContext *avctx, VdpDevice device,
 int av_vdpau_get_surface_parameters(AVCodecContext *avctx, VdpChromaType *type,
                                     uint32_t *width, uint32_t *height);
 
+#if FF_API_VDPAU_ALLOC_GET_SET
 /**
  * Allocate an AVVDPAUContext.
  *
  * @return Newly-allocated AVVDPAUContext or NULL on failure.
+ * @deprecated use av_vdpau_bind_context() instead
  */
+attribute_deprecated
 AVVDPAUContext *av_vdpau_alloc_context(void);
+#endif
 
 /** @} */
 
diff --git a/libavcodec/version_major.h b/libavcodec/version_major.h
index c11114bf93..ab1f4511b4 100644
--- a/libavcodec/version_major.h
+++ b/libavcodec/version_major.h
@@ -46,5 +46,6 @@
 #define FF_API_FF_PROFILE_LEVEL    (LIBAVCODEC_VERSION_MAJOR < 62)
 #define FF_API_AVCODEC_CLOSE       (LIBAVCODEC_VERSION_MAJOR < 62)
 #define FF_API_BUFFER_MIN_SIZE     (LIBAVCODEC_VERSION_MAJOR < 62)
+#define FF_API_VDPAU_ALLOC_GET_SET (LIBAVCODEC_VERSION_MAJOR < 62)
 
 #endif /* AVCODEC_VERSION_MAJOR_H */