mirror of
https://github.com/lhns/steam-frame-nix.git
synced 2026-10-06 06:00:22 +02:00
Pierre Kisters
fd97347e18
Jellyfin Desktop hard-sets mpv's hwdec=auto-copy, whose probe list leaves out V4L2 M2M, and the Flatpak can't see the Frame's V4L2 decoder. An LD_PRELOAD shim (preloaded straight from the store, only that path exposed read-only) rewrites hwdec to v4l2m2m-copy,auto-copy; devices=all makes the decoder visible. Overrides via nix-flatpak, or a home-manager-owned override file without it.
71 lines
3.2 KiB
Nix
71 lines
3.2 KiB
Nix
# Checks of the Jellyfin hardware decoding pieces: the mpv hwdec shim's ELF
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# (libc only, no rpath, GLIBC <= 2.34) and rewriting (against a fake libmpv
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# that prints what it receives).
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{ pkgs }:
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let
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shim = pkgs.callPackage ./shim.nix { };
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in
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pkgs.runCommandCC "jellyfin-check" { nativeBuildInputs = [ pkgs.binutils ]; } ''
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so=${shim}/lib/mpv-hwdec-shim.so
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fail() { echo "FAIL: $*" >&2; exit 1; }
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needed=$(readelf -dW $so | sed -n 's/.*(NEEDED).*\[\(.*\)\]/\1/p')
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for lib in $needed; do
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case $lib in libc.so.6|ld-linux*) ;; *) fail "needs $lib" ;; esac
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done
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! readelf -dW $so | grep -Eq '\((RPATH|RUNPATH)\)' || fail "has an rpath"
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glibc=$(readelf -VW $so | grep -o 'GLIBC_[0-9.]*' | sort -uV | tail -1)
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[ "$(printf '%s\n' "$glibc" GLIBC_2.34 | sort -V | tail -1)" = GLIBC_2.34 ] ||
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fail "needs $glibc"
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echo "ELF ok: NEEDED" $needed", newest $glibc"
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cat > mpv.c <<'C'
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#include <stdio.h>
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#include <stdint.h>
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typedef struct { union { char *string; } u; int format; } mpv_node;
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static void show(const char *n, int f, void *d) {
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printf("%s=%s\n", n, f == 1 ? *(char **)d : ((mpv_node *)d)->u.string);
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}
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int mpv_set_property(void *c, const char *n, int f, void *d) { show(n, f, d); return 0; }
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int mpv_set_option(void *c, const char *n, int f, void *d) { show(n, f, d); return 0; }
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int mpv_set_property_async(void *c, uint64_t u, const char *n, int f, void *d) { show(n, f, d); return 0; }
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int mpv_set_property_string(void *c, const char *n, const char *d) { printf("%s=%s\n", n, d); return 0; }
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int mpv_set_option_string(void *c, const char *n, const char *d) { printf("%s=%s\n", n, d); return 0; }
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C
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cat > app.c <<'C'
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#include <stdint.h>
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typedef struct { union { char *string; } u; int format; } mpv_node;
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int mpv_set_property(void *, const char *, int, void *);
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int mpv_set_option(void *, const char *, int, void *);
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int mpv_set_property_async(void *, uint64_t, const char *, int, void *);
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int mpv_set_property_string(void *, const char *, const char *);
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int mpv_set_option_string(void *, const char *, const char *);
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int main(void) {
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char *s = "auto-copy", *no = "no";
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mpv_node node = { { "auto" }, 1 };
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mpv_set_property_string(0, "hwdec", "auto-copy");
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mpv_set_option_string(0, "hwdec", "auto");
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mpv_set_property(0, "hwdec", 1, &s);
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mpv_set_option(0, "hwdec", 6, &node);
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mpv_set_property_async(0, 0, "hwdec", 1, &s);
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mpv_set_property(0, "hwdec", 1, &no);
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mpv_set_property_string(0, "vo", "auto");
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return 0;
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}
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C
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$CC -shared -fPIC -o libmpv.so mpv.c
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$CC -o app app.c -L. -lmpv -Wl,-rpath,$PWD
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h=v4l2m2m-copy,auto-copy
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expect="hwdec=$h hwdec=$h hwdec=$h hwdec=$h hwdec=$h hwdec=no vo=auto"
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got=$(LD_PRELOAD=$so ./app 2> err)
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[ "$(echo $got)" = "$expect" ] || fail "got: $(echo $got)"
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[ "$(grep -c mpv-hwdec-shim: err)" = 1 ] || fail "logged: $(cat err)"
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got=$(SFN_MPV_HWDEC=vaapi LD_PRELOAD=$so ./app 2> /dev/null)
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[ "$(echo $got)" = "$(echo "$expect" | sed "s/$h/vaapi/g")" ] || fail "SFN_MPV_HWDEC: $(echo $got)"
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# Processes without libmpv (preloaded all over the sandbox) are unaffected.
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[ "$(LD_PRELOAD=$so ${pkgs.coreutils}/bin/echo ok)" = ok ] || fail "without libmpv"
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echo "rewrite ok"
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touch $out
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''
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