[ROCm][CI] Add TorchCodec source build for transcription tests (#31323)

Signed-off-by: Andreas Karatzas <akaratza@amd.com>

tools/install_torchcodec_rocm.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+# Script to install TorchCodec from source (required for ROCm compatibility)
+
+set -e
+
+TORCHCODEC_REPO="${TORCHCODEC_REPO:-https://github.com/pytorch/torchcodec.git}"
+TORCHCODEC_BRANCH="${TORCHCODEC_BRANCH:-main}"
+
+echo "=== TorchCodec Installation Script ==="
+
+# Check if torchcodec is already installed and working
+if python3 -c "from torchcodec.decoders import VideoDecoder" 2>/dev/null; then
+    echo "TorchCodec is already installed and working. Skipping."
+    exit 0
+fi
+
+echo "TorchCodec not found. Installing from source..."
+
+# Install system dependencies (FFmpeg + pkg-config)
+install_system_deps() {
+    if command -v apt-get &> /dev/null; then
+        echo "Installing system dependencies..."
+        apt-get update && apt-get install -y --no-install-recommends \
+            pkg-config \
+            ffmpeg libavcodec-dev libavformat-dev libavutil-dev \
+            libswscale-dev libavdevice-dev libavfilter-dev libswresample-dev
+    else
+        echo "Warning: apt-get did not work. Please install dependencies manually."
+        return 1
+    fi
+}
+
+# Check for pkg-config
+if ! command -v pkg-config &> /dev/null; then
+    echo "pkg-config not found. Installing system dependencies..."
+    install_system_deps
+fi
+
+# Check for required FFmpeg libraries
+echo "Checking for FFmpeg libraries..."
+if ! pkg-config --exists libavcodec libavformat libavutil libswscale libavdevice libavfilter libswresample 2>/dev/null; then
+    echo "FFmpeg development libraries not found. Installing..."
+    install_system_deps
+fi
+
+# Install Python build dependencies
+echo "Installing Python build dependencies..."
+pip install pybind11 setuptools wheel
+
+# Set pybind11 cmake path so CMake can find it
+export pybind11_DIR=$(python3 -c "import pybind11; print(pybind11.get_cmake_dir())")
+export CMAKE_PREFIX_PATH="${pybind11_DIR}:${CMAKE_PREFIX_PATH}"
+echo "pybind11_DIR set to: $pybind11_DIR"
+
+# Create temp directory for build
+BUILD_DIR=$(mktemp -d -t torchcodec-XXXXXX)
+echo "Building in temporary directory: $BUILD_DIR"
+
+cleanup() {
+    echo "Cleaning up $BUILD_DIR"
+    rm -rf "$BUILD_DIR"
+}
+trap cleanup EXIT
+
+# Clone and build
+cd "$BUILD_DIR"
+echo "Cloning TorchCodec from $TORCHCODEC_REPO (branch: $TORCHCODEC_BRANCH)..."
+git clone --depth 1 --branch "$TORCHCODEC_BRANCH" "$TORCHCODEC_REPO" torchcodec
+
+cd torchcodec
+
+# Set build environment for ROCm compatibility
+export TORCHCODEC_CMAKE_BUILD_DIR="${PWD}/build"
+export TORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR=1
+export I_CONFIRM_THIS_IS_NOT_A_LICENSE_VIOLATION=1
+
+echo "Building TorchCodec..."
+pip install . --no-build-isolation
+
+# Verify installation
+echo "Verifying installation..."
+if python3 -c "from torchcodec.decoders import VideoDecoder; print('TorchCodec installed successfully!')"; then
+    echo "=== TorchCodec installation complete ==="
+else
+    echo "Error: TorchCodec installation failed verification"
+    exit 1
+fi