refactor: extract flag parsing, validation, and packet processing into functions; add README and .gitignore

scripts/download-models.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+models_dir="$repo_root/models"
+parakeet_dir="$models_dir/parakeet-tdt-v2"
+archive_url="https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-nemo-parakeet-tdt-0.6b-v2-int8.tar.bz2"
+vad_url="https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/silero_vad_v5.onnx"
+
+command -v curl >/dev/null || { echo "curl is required" >&2; exit 1; }
+command -v tar >/dev/null || { echo "tar is required" >&2; exit 1; }
+
+mkdir -p "$models_dir"
+tmp_dir="$(mktemp -d)"
+trap 'rm -rf "$tmp_dir"' EXIT
+
+echo "Downloading Parakeet TDT v2 int8 model..."
+curl --fail --location --progress-bar "$archive_url" --output "$tmp_dir/parakeet.tar.bz2"
+tar -xjf "$tmp_dir/parakeet.tar.bz2" -C "$tmp_dir"
+
+source_dir="$(find "$tmp_dir" -mindepth 1 -maxdepth 1 -type d -name 'sherpa-onnx-nemo-parakeet-tdt-0.6b-v2-int8' -print -quit)"
+if [[ -z "$source_dir" ]]; then
+  echo "Downloaded archive did not contain the expected Parakeet directory" >&2
+  exit 1
+fi
+
+rm -rf "$parakeet_dir"
+mkdir -p "$parakeet_dir"
+cp "$source_dir/encoder.int8.onnx" "$parakeet_dir/"
+cp "$source_dir/decoder.int8.onnx" "$parakeet_dir/"
+cp "$source_dir/joiner.int8.onnx" "$parakeet_dir/"
+cp "$source_dir/tokens.txt" "$parakeet_dir/"
+
+echo "Downloading Silero VAD..."
+curl --fail --location --progress-bar "$vad_url" --output "$models_dir/silero_vad_v5.onnx"
+
+echo "Models installed in $models_dir"