Build shared FFmpeg on Linux and set dependencies to stubs

Task-number: QTBUG-120990
Change-Id: I8fccf8ef58cf6334e71287450ee30cc2256516d9
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 83adc86c53)

coin/provisioning/common/linux/fix_ffmpeg_dependencies.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Copyright (C) 2024 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+set -x
+
+lib_dir="$1/lib"
+
+ffmpeg_libs=("avcodec" "avdevice" "avfilter" "avformat" "avutil" "swresample" "swscale")
+
+for lib_name in "${ffmpeg_libs[@]}"; do
+    lib_path="$lib_dir/lib$lib_name.so"
+    pkg_config_file_path="$lib_dir/pkgconfig/lib$lib_name.pc"
+
+    if [ ! -f "$lib_path" ]; then
+        echo "FFmpeg lib $lib_path hasn't been found"
+        exit 1
+    fi
+
+    if [ ! -f "$pkg_config_file_path" ]; then
+        echo "FFmpeg pc file $pkg_config_file_path hasn't been found"
+        exit 1
+    fi
+
+    while read -r line; do
+        if [[ $line =~ .*\[(lib((ssl|crypto|va|va-x11|va-drm)\.so(\.[0-9]+)*))\].* ]]; then
+            patchelf --replace-needed "${BASH_REMATCH[1]}" "libQt6FFmpegStub-${BASH_REMATCH[2]}" $lib_path
+        fi
+    done <<< "$(readelf -d $lib_path | grep '(NEEDED)' )"
+
+    sed -i -E "/^Libs.private:/s/ -l(va|va-x11|va-drm|ssl|crypto)/ -lQt6FFmpegStub-\\1/g;" $pkg_config_file_path
+    patchelf --set-rpath '$ORIGIN' $lib_path
+done