68 lines
2.7 KiB
Bash
68 lines
2.7 KiB
Bash
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#!/usr/bin/env bash
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# ==============================================================================
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# WORKER SCRIPT: compress_audio.sh (v6.1 - libvorbis only, bug-fix)
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# ==============================================================================
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set -Eeuo pipefail
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trap 'echo "❌ 发生错误 (line $LINENO)" >&2' ERR
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# ---------- 可调环境变量 ----------
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SOURCE_DIR="${SOURCE_DIR:-./asset/audio}"
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OUTPUT_DIR="${OUTPUT_DIR:-./compressed_audio}"
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BYTE_RATE_THRESHOLD="${BYTE_RATE_THRESHOLD:-60000}" # < 60 kB/s 视为已压缩
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OVERWRITE="${OVERWRITE:-0}" # 0=跳过已存在
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AUDIO_RATE="${AUDIO_RATE:-44100}" # Vorbis 常用 44.1 kHz
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DRY_RUN="${DRY_RUN:-0}"
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LOG_LEVEL="${LOG_LEVEL:-info}" # info / debug
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# ---------- 固定编解码参数 ----------
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OUTPUT_EXT="ogg"
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ENC_OPTS="-c:a libvorbis -q:a 5" # 0–10, 5≈~160 kbps
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# ---------- 参数检查 ----------
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[[ $# -eq 0 || -z ${1:-} ]] && { echo "用法: $0 <audio-file>" >&2; exit 2; }
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audio_file=$1
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[[ ! -f $audio_file ]] && { echo "文件不存在: $audio_file" >&2; exit 2; }
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# ---------- 辅助 ----------
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log(){ [[ $LOG_LEVEL == debug || $1 != debug ]] && echo "[$1] $2" >&2; }
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get_size(){ [[ $(uname) == Darwin ]] && stat -f%z "$1" || stat -c%s "$1"; }
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# ---------- 输出路径 ----------
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relative="${audio_file#$SOURCE_DIR/}"
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base="${relative%.*}"
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output="$OUTPUT_DIR/${base}.${OUTPUT_EXT}"
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# ---------- 跳过已存在 ----------
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if [[ $OVERWRITE -eq 0 && -f $output ]]; then
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log info "SKIP(已存在): $output"; exit 2; fi
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# ---------- 获取时长 ----------
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duration=$(ffprobe -v error -show_entries format=duration \
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-of default=noprint_wrappers=1:nokey=1 "$audio_file" | head -n1)
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if [[ -z $duration || $(awk "BEGIN{print ($duration<=0)}") -eq 1 ]]; then
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log info "SKIP(无效): $audio_file"; exit 2; fi
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# ---------- 获取比特率 ----------
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bitrate=$(ffprobe -v error -select_streams a:0 -show_entries stream=bit_rate \
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-of default=noprint_wrappers=1:nokey=1 "$audio_file" | head -n1)
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# 某些文件无 bit_rate；回退到 size/duration
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if [[ -z $bitrate || $bitrate == N/A || $bitrate == 0 ]]; then
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size=$(get_size "$audio_file")
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bitrate=$(awk "BEGIN{printf \"%.0f\", $size/$duration}")
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fi
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if (( bitrate < BYTE_RATE_THRESHOLD )); then
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log info "SKIP(已压缩, ${bitrate}B/s): $audio_file"; exit 2; fi
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[[ $DRY_RUN -eq 1 ]] && { log info "DRY-RUN: $audio_file → $output"; exit 0; }
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mkdir -p "$(dirname "$output")"
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log info "COMPRESS → $output"
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ffmpeg -hide_banner -loglevel error -y \
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-i "$audio_file" -vn -sn $ENC_OPTS -ar "$AUDIO_RATE" -map_metadata -1 \
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"$output" \
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&& { log info "SUCCESS"; exit 0; } \
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|| { log info "FAILED"; exit 1; }
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