From 501d815ec45d38aed403e4db576d2439a6c61127 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 4 Oct 2026 02:50:51 +0200
Subject: [PATCH] avutil/frame: let libavutil allocate a video frame's buffer
 with its own allocator

ff_frame_get_video_buffer() lays a video frame out like
av_frame_get_buffer() does, but takes the buffer from a callback, so
that the memory can come from a pool or from a device specific
allocator.

Assisted-by: Claude
---
 libavutil/frame.c          |  9 ++++++---
 libavutil/frame_internal.h | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 3 deletions(-)
 create mode 100644 libavutil/frame_internal.h

diff --git a/libavutil/frame.c b/libavutil/frame.c
index ca8e8486a3..185adbef68 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -21,6 +21,7 @@
 #include "buffer.h"
 #include "dict.h"
 #include "frame.h"
+#include "frame_internal.h"
 #include "imgutils.h"
 #include "mem.h"
 #include "refstruct.h"
@@ -72,7 +73,9 @@ void av_frame_free(AVFrame **frame)
 
 #define ALIGN (HAVE_SIMD_ALIGN_64 ? 64 : 32)
 
-static int get_video_buffer(AVFrame *frame, int align)
+int ff_frame_get_video_buffer(AVFrame *frame, int align,
+                              AVBufferRef *(*alloc)(void *opaque, size_t size),
+                              void *opaque)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
     int ret, padded_height;
@@ -119,7 +122,7 @@ static int get_video_buffer(AVFrame *frame, int align)
         total_size += sizes[i];
     }
 
-    frame->buf[0] = av_buffer_alloc(total_size);
+    frame->buf[0] = alloc ? alloc(opaque, total_size) : av_buffer_alloc(total_size);
     if (!frame->buf[0]) {
         ret = AVERROR(ENOMEM);
         goto fail;
@@ -209,7 +212,7 @@ int av_frame_get_buffer(AVFrame *frame, int align)
         return AVERROR(EINVAL);
 
     if (frame->width > 0 && frame->height > 0)
-        return get_video_buffer(frame, align);
+        return ff_frame_get_video_buffer(frame, align, NULL, NULL);
     else if (frame->nb_samples > 0 &&
              (av_channel_layout_check(&frame->ch_layout)))
         return get_audio_buffer(frame, align);
diff --git a/libavutil/frame_internal.h b/libavutil/frame_internal.h
new file mode 100644
index 0000000000..a9f1c61805
--- /dev/null
+++ b/libavutil/frame_internal.h
@@ -0,0 +1,37 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_FRAME_INTERNAL_H
+#define AVUTIL_FRAME_INTERNAL_H
+
+#include <stddef.h>
+
+#include "buffer.h"
+#include "frame.h"
+
+/**
+ * Allocate the buffer of a video frame like av_frame_get_buffer().
+ *
+ * @param alloc  allocates the buffer, av_buffer_alloc() is used if NULL
+ * @param opaque passed to alloc
+ */
+int ff_frame_get_video_buffer(AVFrame *frame, int align,
+                              AVBufferRef *(*alloc)(void *opaque, size_t size),
+                              void *opaque);
+
+#endif /* AVUTIL_FRAME_INTERNAL_H */