libplacebo Dolby Vision dynamic brightness support

0001-utils-libav-derive-scene-brightness-info-from-DOVI-R.patch

From 1aecda5d8ca32ec350fce095b7a8a773300ce45a Mon Sep 17 00:00:00 2001
From: quietvoid <[email protected]>
Date: Mon, 13 Feb 2023 09:36:57 -0500
Subject: [PATCH] utils/libav: derive scene brightness info from DOVI RPU

Using `libdovi` to parse the RPU, as `AVDOVIMetadata`
does not yet parse the extension metadata blocks.
---
 src/include/libplacebo/utils/libav_internal.h | 26 +++++++++++++++++++
 src/meson.build                               |  6 +++++
 2 files changed, 32 insertions(+)

diff --git a/src/include/libplacebo/utils/libav_internal.h b/src/include/libplacebo/utils/libav_internal.h
index f8ded127..c3f29cab 100644
--- a/src/include/libplacebo/utils/libav_internal.h
+++ b/src/include/libplacebo/utils/libav_internal.h
@@ -41,6 +41,10 @@
 # include <libplacebo/vulkan.h>
 #endif
 
+#ifdef PL_HAVE_DOVI
+#include <libdovi/rpu_parser.h>
+#endif
+
 static inline enum pl_color_system pl_system_from_av(enum AVColorSpace spc)
 {
     switch (spc) {
@@ -1093,6 +1097,28 @@ static inline bool pl_map_avframe_internal(pl_gpu gpu, struct pl_frame *out,
                     pl_hdr_rescale(PL_HDR_PQ, PL_HDR_NITS, color->source_max_pq / 4095.0f);
             }
         }
+
+#ifdef PL_HAVE_DOVI
+        if ((sd = av_frame_get_side_data(frame, AV_FRAME_DATA_DOVI_RPU_BUFFER))) {
+            DoviRpuOpaque *rpu_in = dovi_parse_unspec62_nalu(sd->data, sd->size);
+            const DoviRpuDataHeader *header = dovi_rpu_get_header(rpu_in);
+            if (header && header->vdr_dm_metadata_present_flag) {
+                const DoviVdrDmData *vdr_dm_data = dovi_rpu_get_vdr_dm_data(rpu_in);
+                if (vdr_dm_data->dm_data.level1) {
+                    const DoviExtMetadataBlockLevel1 *l1 = vdr_dm_data->dm_data.level1;
+                    const float max_luma = pl_hdr_rescale(PL_HDR_PQ, PL_HDR_NITS, l1->max_pq / 4095.0f);
+
+                    out->color.hdr.scene_max[0] = out->color.hdr.scene_max[1] = out->color.hdr.scene_max[2] = max_luma;
+                    out->color.hdr.scene_avg = pl_hdr_rescale(PL_HDR_PQ, PL_HDR_NITS, l1->avg_pq / 4095.0f);
+                }
+
+            }
+
+            if (header)
+                dovi_rpu_free_header(header);
+            dovi_rpu_free(rpu_in);
+        }
+#endif
     }
 #endif
 
diff --git a/src/meson.build b/src/meson.build
index 0c31ae0f..6b54d8fb 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -126,6 +126,12 @@ if lcms.found()
   tests += 'icc.c'
 endif
 
+dovi = dependency('dovi', required: false)
+components.set('dovi', dovi.found())
+if dovi.found()
+  build_deps += dovi
+endif
+
 # Check to see if libplacebo built this way is sane
 if not (components.get('vulkan') or components.get('opengl') or components.get('d3d11'))
   warning('Building without any graphics API. libplacebo built this way still ' +
-- 
2.39.1

PKGBUILD

# Maintainer: Gustavo Alvarez <[email protected]>
# Contributor: Levente Polyak <anthraxx[at]archlinux[dot]org>

pkgname=libplacebo-custom
pkgver=v5.229.1.179.g1f1d708e2
pkgrel=1
pkgdesc='Reusable library for GPU-accelerated video/image rendering primitives. (GIT version)'
url='https://code.videolan.org/videolan/libplacebo'
arch=('x86_64')
license=('LGPL2.1')
depends=('libvulkan.so'
         'liblcms2.so'
         'libshaderc_shared.so'
         'glslang'
         'libavcodec.so'
         'libavutil.so'
         'libavformat.so'
         )
makedepends=('git'
             'meson'
             'ninja'
             'vulkan-headers'
             'vulkan-icd-loader'
             'python-mako'
             'python-jinja'
             'python-markupsafe'
             'ffmpeg'
             'lcms2'
             'shaderc'
             'dav1d'
             )
provides=('libplacebo'
          'libplacebo.so'
          )
conflicts=('libplacebo')
source=('git+https://code.videolan.org/videolan/libplacebo.git')
options=(!emptydirs debug !strip)

#add patch numbers from github here
_gitlab_patches=()
for patch in ${_gitlab_patches[@]}
do
    source+=("https://code.videolan.org/videolan/libplacebo/-/merge_requests/${patch}.patch")
done

#other patches
source+=('https://gist.githubusercontent.com/quietvoid/a3ef15d8556c3f346aca5c4e304f0b04/raw/0001-utils-libav-derive-scene-brightness-info-from-DOVI-R.patch')

#all sources should have sha256sums skipped
for i in ${source[@]}
do
    sha256sums+=('SKIP')
done

pkgver() {
  cd libplacebo
  echo "$(git describe --long --tags | tr - .)"
}

prepare() {
  cd libplacebo

  for i in "${srcdir}"/*.patch
  do  
    [[ -e "$i" ]] || continue 
      echo "Applying $i"
      git apply "$i"
  done

  git submodule update --init
  cd ..

  mkdir -p build
}

build() {
  cd build
  arch-meson --buildtype=debugoptimized ../libplacebo \
    -D vulkan=enabled \
    -D glslang=enabled \
    -D shaderc=enabled \
    -D lcms=enabled \
    -D d3d11=disabled \
    -D tests=true \
    -D demos=true

  ninja
}

check() {
  ninja -C build # test
}

package() {
  DESTDIR="$pkgdir" ninja -C build install

  install -Dm644 libplacebo/README.md "${pkgdir}/usr/share/doc/${pkgname}/README.md"
}