package cn.org.hentai.jtt1078.util;
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import java.io.*;
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import java.nio.file.*;
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public class AudioConverter {
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public static byte[] convertWebmToPcm(byte[] webmBytes) throws IOException, InterruptedException {
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// 1. 创建临时文件（自动删除）
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File inputFile = File.createTempFile("audio", ".webm");
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File outputFile = File.createTempFile("pcm", ".raw");
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try {
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// 2. 写入输入文件
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Files.write(inputFile.toPath(), webmBytes);
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// 3. 构建 FFmpeg 命令
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ProcessBuilder pb = new ProcessBuilder(
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"ffmpeg",
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"-i", inputFile.getAbsolutePath(), // 输入文件
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"-f", "s16le", // PCM 16-bit little-endian
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"-acodec", "pcm_s16le", // 音频编码器
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"-ar", "8000", // 采样率 8kHz
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"-ac", "1", // 单声道
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"-y", // 覆盖输出文件（如果存在）
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outputFile.getAbsolutePath()
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);
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// 4. 捕获错误流（关键！）
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pb.redirectErrorStream(true); // 合并标准输出和错误流
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Process process = pb.start();
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// 5. 读取 FFmpeg 输出（调试用）
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try (BufferedReader reader = new BufferedReader(
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new InputStreamReader(process.getInputStream()))) {
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String line;
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while ((line = reader.readLine()) != null) {
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System.out.println("[FFmpeg] " + line); // 打印 FFmpeg 日志
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}
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}
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// 6. 等待转换完成
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int exitCode = process.waitFor();
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if (exitCode != 0) {
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throw new IOException("FFmpeg 转换失败，退出码: " + exitCode);
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}
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// 7. 读取 PCM 数据
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return Files.readAllBytes(outputFile.toPath());
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} finally {
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// 8. 清理临时文件
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inputFile.delete();
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outputFile.delete();
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}
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}
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public static void convertWebmToMp3(File webmFile, File mp3File) throws IOException, InterruptedException {
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ProcessBuilder pb = new ProcessBuilder(
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"ffmpeg", "-y",
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"-i", webmFile.getAbsolutePath(),
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"-ar", "44100", // 转换为标准 MP3 采样率
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"-ac", "2", // 立体声
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"-b:a", "128k",
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mp3File.getAbsolutePath()
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);
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pb.redirectErrorStream(true);
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Process process = pb.start();
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process.waitFor();
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}
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}
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