LK Capture integration

.build-info.json.in

@@ -4,5 +4,7 @@
   "cpp_git_commit": "@GIT_COMMIT@",
   "rust_submodule_commit": "@RUST_GIT_COMMIT@",
   "livekit_ffi_version": "@LIVEKIT_FFI_VERSION@",
+  "capture_enabled": @LIVEKIT_CAPTURE_ENABLED@,
+  "cargo_features": "@LIVEKIT_CARGO_FEATURES@",
   "build_date": "@BUILD_DATE@"
 }

.gitattributes

@@ -1,2 +1,3 @@
 data/welcome.wav filter=lfs diff=lfs merge=lfs -text
 build.cmd whitespace=cr-at-eol
+CMakePresets.json whitespace=cr-at-eol

.github/actions/build-sdk/action.yml

@@ -0,0 +1,74 @@
+# Copyright 2026 LiveKit, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Build SDK
+description: Configure and build an SDK variant with the repository build scripts.
+inputs:
+  preset:
+    description: Build script command, such as release-examples or debug-tests.
+    required: true
+  capture:
+    description: Capture sources (all, none, or gstreamer,pattern,clock).
+    default: 'none'
+  bundle-dir:
+    description: Optional installation directory for an SDK bundle.
+    default: ''
+  version:
+    description: Optional SDK version to inject.
+    default: ''
+  macos-arch:
+    description: Optional macOS architecture override.
+    default: ''
+runs:
+  using: composite
+  steps:
+    - name: Build (Unix)
+      if: runner.os != 'Windows'
+      shell: bash
+      env:
+        SDK_PRESET: ${{ inputs.preset }}
+        SDK_CAPTURE: ${{ inputs.capture }}
+        SDK_BUNDLE_DIR: ${{ inputs.bundle-dir }}
+        SDK_VERSION: ${{ inputs.version }}
+        SDK_MACOS_ARCH: ${{ inputs.macos-arch }}
+      run: |
+        args=(./build.sh "$SDK_PRESET")
+        case "$SDK_CAPTURE" in
+          all) args+=(--capture) ;;
+          none|"") args+=(--no-capture) ;;
+          *) args+=(--capture="$SDK_CAPTURE") ;;
+        esac
+        if [[ -n "$SDK_BUNDLE_DIR" ]]; then args+=(--bundle --prefix "$SDK_BUNDLE_DIR"); fi
+        if [[ -n "$SDK_VERSION" ]]; then args+=(--version "$SDK_VERSION"); fi
+        if [[ -n "$SDK_MACOS_ARCH" ]]; then args+=(--macos-arch "$SDK_MACOS_ARCH"); fi
+        "${args[@]}"
+    - name: Build (Windows)
+      if: runner.os == 'Windows'
+      shell: pwsh
+      env:
+        SDK_PRESET: ${{ inputs.preset }}
+        SDK_CAPTURE: ${{ inputs.capture }}
+        SDK_BUNDLE_DIR: ${{ inputs.bundle-dir }}
+        SDK_VERSION: ${{ inputs.version }}
+      run: |
+        $buildArgs = @($env:SDK_PRESET)
+        switch ([string]$env:SDK_CAPTURE) {
+          'all' { $buildArgs += '--capture'; break }
+          { $_ -in @('none', '') } { $buildArgs += '--no-capture'; break }
+          default { $buildArgs += "--capture=$($env:SDK_CAPTURE)" }
+        }
+        if ($env:SDK_BUNDLE_DIR) { $buildArgs += @('--bundle', '--prefix', $env:SDK_BUNDLE_DIR) }
+        if ($env:SDK_VERSION) { $buildArgs += @('--version', $env:SDK_VERSION) }
+        & .\build.cmd @buildArgs
+        if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }

.github/actions/cargo-target-root/action.yml

@@ -0,0 +1,26 @@
+# Copyright 2026 LiveKit, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Set Cargo output root
+description: Use a short Cargo root on Windows and the submodule target directory elsewhere.
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        if [[ "$RUNNER_OS" == "Windows" ]]; then
+          echo "CARGO_TARGET_DIR=$(cygpath -m "$RUNNER_TEMP")/lk-rust" >> "$GITHUB_ENV"
+        else
+          echo "CARGO_TARGET_DIR=$GITHUB_WORKSPACE/client-sdk-rust/target" >> "$GITHUB_ENV"
+        fi

.github/actions/check-sdk-symbols/action.yml

@@ -0,0 +1,34 @@
+# Copyright 2026 LiveKit, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Check SDK exported symbols
+description: Reject private dependency symbols exported by an installed SDK.
+inputs:
+  bundle-dir:
+    description: SDK installation directory relative to the workspace.
+    required: true
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      env:
+        SDK_BUNDLE_DIR: ${{ inputs.bundle-dir }}
+      run: |
+        case "$RUNNER_OS" in
+          Windows) lib="$SDK_BUNDLE_DIR/bin/livekit.dll" ;;
+          macOS) lib="$SDK_BUNDLE_DIR/lib/liblivekit.dylib" ;;
+          Linux) lib="$SDK_BUNDLE_DIR/lib/liblivekit.so" ;;
+          *) echo "Unsupported runner OS: $RUNNER_OS" >&2; exit 1 ;;
+        esac
+        python .github/scripts/check_no_private_symbols.py "$lib"

.github/actions/setup-capture/action.yml

@@ -0,0 +1,86 @@
+name: Set up capture dependencies
+description: Install additional build and runtime dependencies for capture-enabled SDK builds.
+runs:
+  using: composite
+  steps:
+    - name: Install GStreamer (Linux)
+      if: runner.os == 'Linux'
+      shell: bash
+      run: |
+        sudo apt-get update
+        # Request the distro unwinder explicitly so apt can replace conflicting
+        # LLVM unwinder development packages on Ubuntu 22.04 runners.
+        sudo apt-get install -y libunwind-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \
+          gstreamer1.0-plugins-base gstreamer1.0-plugins-good \
+          gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav
+    - name: Install GStreamer (macOS)
+      if: runner.os == 'macOS'
+      env:
+        GSTREAMER_MACOS_VERSION: "1.28.5"
+        GSTREAMER_MACOS_RUNTIME_SHA256: "0a8fc7a1cf8d7bac833ca0ebe2fd196a199c2465e810cd5b1e4b4f720c258f43"
+        GSTREAMER_MACOS_DEVEL_SHA256: "6f7b55e8fb86dcc615c9cae46b79b7785851e5c77f79a938648a81dfa2603729"
+      shell: bash
+      run: |
+        set -euo pipefail
+        # Official universal packages cover both x86_64 and arm64. Homebrew
+        # no longer produces Intel bottles and may compile its dependency tree.
+        base_url="https://gstreamer.freedesktop.org/data/pkg/osx/$GSTREAMER_MACOS_VERSION"
+        installer_dir="$RUNNER_TEMP/gstreamer-installers"
+        runtime_pkg="gstreamer-1.0-$GSTREAMER_MACOS_VERSION-universal.pkg"
+        devel_pkg="gstreamer-1.0-devel-$GSTREAMER_MACOS_VERSION-universal.pkg"
+        mkdir -p "$installer_dir"
+
+        for package in "$runtime_pkg" "$devel_pkg"; do
+          expected_hash="$GSTREAMER_MACOS_RUNTIME_SHA256"
+          if [[ "$package" == "$devel_pkg" ]]; then
+            expected_hash="$GSTREAMER_MACOS_DEVEL_SHA256"
+          fi
+          curl --fail --location --retry 3 --connect-timeout 30 --max-time 600 \
+            "$base_url/$package" --output "$installer_dir/$package"
+          printf '%s  %s\n' "$expected_hash" "$installer_dir/$package" | shasum -a 256 -c -
+        done
+
+        # Verify both downloads before installing either package.
+        sudo installer -pkg "$installer_dir/$runtime_pkg" -target /
+        sudo installer -pkg "$installer_dir/$devel_pkg" -target /
+
+        framework="/Library/Frameworks/GStreamer.framework/Versions/1.0"
+        echo "$framework/bin" >> "$GITHUB_PATH"
+        export PATH="$framework/bin:$PATH"
+        export PKG_CONFIG_PATH="$framework/lib/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}"
+        echo "PKG_CONFIG_PATH=$PKG_CONFIG_PATH" >> "$GITHUB_ENV"
+        # The framework dylibs use @rpath. Rust sys-crate linker arguments do
+        # not propagate to the final FFI dylib, so set its runtime search path.
+        echo "RUSTFLAGS=${RUSTFLAGS:+$RUSTFLAGS }-C link-arg=-Wl,-rpath,$framework/lib" >> "$GITHUB_ENV"
+        pkg-config --modversion gstreamer-1.0 gstreamer-app-1.0
+        gst-inspect-1.0 --version
+    - name: Install GStreamer (Windows)
+      if: runner.os == 'Windows'
+      env:
+        GSTREAMER_WINDOWS_VERSION: "1.28.5"
+        GSTREAMER_WINDOWS_SHA256: "51ee5eaec33008e8409d8cf6f6884457f22aa3bd515f8856f993a3eaab903530"
+      shell: pwsh
+      run: |
+        $installer = Join-Path $env:RUNNER_TEMP "gstreamer-installer.exe"
+        $installDir = Join-Path $env:RUNNER_TEMP "gstreamer"
+        $uri = "https://gstreamer.freedesktop.org/data/pkg/windows/$env:GSTREAMER_WINDOWS_VERSION/msvc/gstreamer-1.0-msvc-x86_64-$env:GSTREAMER_WINDOWS_VERSION.exe"
+
+        Invoke-WebRequest -Uri $uri -OutFile $installer
+        $actualHash = (Get-FileHash -Algorithm SHA256 $installer).Hash.ToLowerInvariant()
+        if ($actualHash -ne $env:GSTREAMER_WINDOWS_SHA256) {
+          throw "GStreamer installer SHA-256 mismatch: expected $env:GSTREAMER_WINDOWS_SHA256, got $actualHash"
+        }
+
+        $process = Start-Process -FilePath $installer -ArgumentList @(
+          "/TYPE=devel",
+          "/DIR=$installDir",
+          "/CURRENTUSER",
+          "/VERYSILENT",
+          "/NORESTART"
+        ) -Wait -PassThru
+        if ($process.ExitCode -ne 0) {
+          throw "GStreamer installer failed with exit code $($process.ExitCode)"
+        }
+
+        "$installDir\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+        "PKG_CONFIG_PATH=$installDir\lib\pkgconfig" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append

.github/actions/setup-sdk-deps/action.yml

@@ -0,0 +1,72 @@
+# Copyright 2026 LiveKit, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Set up base SDK dependencies
+description: Install base SDK packages and the build compiler, without capture dependencies.
+inputs:
+  vcpkg-commit:
+    description: Pinned vcpkg revision for Windows builds.
+    default: fb87e2bb3fe69e16c224989acb5a61349166c782
+  linux-extra-packages:
+    description: Optional space-separated Linux packages to install with the base dependencies.
+    default: ''
+runs:
+  using: composite
+  steps:
+    - name: Setup vcpkg (Windows only)
+      if: runner.os == 'Windows'
+      uses: lukka/run-vcpkg@b1a0dd252f06b9e25b3c022a9a03bd7a427fb6a2 # v11.6
+      with:
+        vcpkgGitCommitId: ${{ inputs.vcpkg-commit }}
+
+    - name: Install base deps (Ubuntu)
+      if: runner.os == 'Linux'
+      shell: bash
+      env:
+        SDK_EXTRA_PACKAGES: ${{ inputs.linux-extra-packages }}
+      run: |
+        set -eux
+        extra_packages=()
+        if [[ -n "$SDK_EXTRA_PACKAGES" ]]; then
+          read -r -a extra_packages <<< "$SDK_EXTRA_PACKAGES"
+        fi
+        sudo apt-get update
+        sudo apt-get install -y \
+          build-essential cmake ninja-build pkg-config \
+          llvm-dev libclang-dev clang \
+          libva-dev libdrm-dev libgbm-dev libx11-dev libgl1-mesa-dev \
+          libxext-dev libxcomposite-dev libxdamage-dev libxfixes-dev \
+          libxrandr-dev libxi-dev libxkbcommon-dev \
+          libasound2-dev libpulse-dev \
+          libssl-dev \
+          libprotobuf-dev protobuf-compiler \
+          libabsl-dev \
+          libcurl4-openssl-dev \
+          libwayland-dev libdecor-0-dev \
+          "${extra_packages[@]}"
+
+    # libwebrtc ships hermetic libc++ headers that require a newer clang than
+    # Ubuntu provides. The submodule script exports CC/CXX for later steps.
+    - name: Install clang for libwebrtc
+      if: runner.os == 'Linux'
+      shell: bash
+      run: client-sdk-rust/.github/scripts/install-clang.sh
+
+    - name: Install base deps (macOS)
+      if: runner.os == 'macOS'
+      shell: bash
+      run: |
+        set -eux
+        brew update
+        brew install cmake ninja protobuf abseil