[FFmpeg-devel] [PATCH 1/3] avfilter/vf_libplacebo: list AV_PIX_FMT_VULKAN first

[Niklas Haas <ffmpeg@haasn.xyz>]

From: Niklas Haas <git@haasn.dev>

Under normal circumstances, this change does not affect anything, as the vast
majority of filters either support only vulkan or only software formats.
However, when a filter supports both (such as vf_libplacebo itself, and
possibly vf_scale in the future), linking together two such filter instances
without an explicit format will default matching the input format, resulting
in a redundant round trip through host RAM.

This change bumps up AV_PIX_FMT_VULKAN to the first entry in the format list,
ensuring that it gets preferred whenever possible.
---
 libavfilter/vf_libplacebo.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/libavfilter/vf_libplacebo.c b/libavfilter/vf_libplacebo.c
index 9ff64053cc..c7a1b15f92 100644
--- a/libavfilter/vf_libplacebo.c
+++ b/libavfilter/vf_libplacebo.c
@@ -1150,8 +1150,17 @@ static int libplacebo_query_format(const AVFilterContext *ctx,
     const AVPixFmtDescriptor *desc = NULL;
     AVFilterFormats *infmts = NULL, *outfmts = NULL;
 
+    /* List AV_PIX_FMT_VULKAN first to prefer it when possible */
+    if (s->have_hwdevice) {
+        RET(ff_add_format(&infmts, AV_PIX_FMT_VULKAN));
+        if (s->out_format == AV_PIX_FMT_NONE || av_vkfmt_from_pixfmt(s->out_format))
+            RET(ff_add_format(&outfmts, AV_PIX_FMT_VULKAN));
+    }
+
     while ((desc = av_pix_fmt_desc_next(desc))) {
         enum AVPixelFormat pixfmt = av_pix_fmt_desc_get_id(desc);
+        if (pixfmt == AV_PIX_FMT_VULKAN)
+            continue; /* Handled above */
 
 #if PL_API_VER < 232
         // Older libplacebo can't handle >64-bit pixel formats, so safe-guard
@@ -1160,9 +1169,6 @@ static int libplacebo_query_format(const AVFilterContext *ctx,
             continue;
 #endif
 
-        if (pixfmt == AV_PIX_FMT_VULKAN && !s->have_hwdevice)
-            continue;
-
         if (!pl_test_pixfmt(s->gpu, pixfmt))
             continue;
 
@@ -1173,15 +1179,8 @@ static int libplacebo_query_format(const AVFilterContext *ctx,
             continue; /* BE formats are not supported by pl_download_avframe */
 
         /* Mask based on user specified format */
-        if (s->out_format != AV_PIX_FMT_NONE) {
-            if (pixfmt == AV_PIX_FMT_VULKAN && av_vkfmt_from_pixfmt(s->out_format)) {
-                /* OK */
-            } else if (pixfmt == s->out_format) {
-                /* OK */
-            } else {
-                continue; /* Not OK */
-            }
-        }
+        if (pixfmt != s->out_format && s->out_format != AV_PIX_FMT_NONE)
+            continue;
 
 #if PL_API_VER >= 293
         if (!pl_test_pixfmt_caps(s->gpu, pixfmt, PL_FMT_CAP_RENDERABLE))
-- 
2.49.0

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