android mp3实时录制转换

最新推荐文章于 2024-08-23 08:58:25 发布

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最新推荐文章于 2024-08-23 08:58:25 发布

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分类专栏： csdn 经验分享文章标签： android

本文链接：https://blog.youkuaiyun.com/qq_46041134/article/details/114323989

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本文介绍了在Android上如何实现实时录制MP3音频文件，包括录音权限、依赖库导入、关键类如LameUtil、DataEncodeThread、MP3Recorder的使用，以及PCMFormat的配置。特别指出采样率对转换文字准确性的影响，并提供了资源文件的下载链接。

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Android mp3音频文件录制

我搞了2天的东西公司遇到上传语音转文字需要mp3文件 android ios 都无法录制MP3文件，好多文章都是ndk打包so库，借鉴了好多终于搞定了，给大家分享出来，代码小白勿喷

录音权限必备

各种权限自己加，这里就不一一列举了，文字末尾添加资源文件

library依赖库导入

implementation project(':mp3library')

LameUtil

package com.lebanban.mp3library.util;

public class LameUtil {
   
	static{
   
		System.loadLibrary("mp3lame");
	}

	/**
	 * Initialize LAME.
	 * 
	 * @param inSamplerate
	 *            input sample rate in Hz.
	 * @param inChannel
	 *            number of channels in input stream.
	 * @param outSamplerate
	 *            output sample rate in Hz.
	 * @param outBitrate
	 *            brate compression ratio in KHz.
	 * @param quality
	 *            <p>quality=0..9. 0=best (very slow). 9=worst.</p>
	 *            <p>recommended:</p>
	 *            <p>2 near-best quality, not too slow</p>
	 *            <p>5 good quality, fast</p>
	 *            7 ok quality, really fast
	 */
	public native static void init(int inSamplerate, int inChannel,
			int outSamplerate, int outBitrate, int quality);

	/**
	 * Encode buffer to mp3.
	 * 
	 * @param bufferLeft
	 *            PCM data for left channel.
	 * @param bufferRight
	 *            PCM data for right channel.
	 * @param samples
	 *            number of samples per channel.
	 * @param mp3buf
	 *            result encoded MP3 stream. You must specified
	 *            "7200 + (1.25 * buffer_l.length)" length array.
	 * @return <p>number of bytes output in mp3buf. Can be 0.</p>
	 *         <p>-1: mp3buf was too small</p>
	 *         <p>-2: malloc() problem</p>
	 *         <p>-3: lame_init_params() not called</p>
	 *         -4: psycho acoustic problems
	 */
	public native static int encode(short[] bufferLeft, short[] bufferRight,
			int samples, byte[] mp3buf);

	/**
	 * Flush LAME buffer.
	 * 
	 * REQUIRED:
	 * lame_encode_flush will flush the intenal PCM buffers, padding with
	 * 0's to make sure the final frame is complete, and then flush
	 * the internal MP3 buffers, and thus may return a
	 * final few mp3 frames.  'mp3buf' should be at least 7200 bytes long
	 * to hold all possible emitted data.
	 *
	 * will also write id3v1 tags (if any) into the bitstream
	 *
	 * return code = number of bytes output to mp3buf. Can be 0
	 * @param mp3buf
	 *            result encoded MP3 stream. You must specified at least 7200
	 *            bytes.
	 * @return number of bytes output to mp3buf. Can be 0.
	 */
	public native static int flush(byte[] mp3buf);

	/**
	 * Close LAME.
	 */
	public native static void close();
}

DataEncodeThread

package com.lebanban.mp3library;

import android.media.AudioRecord;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;


import com.lebanban.mp3library.util.LameUtil;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class DataEncodeThread extends HandlerThread implements AudioRecord.OnRecordPositionUpdateListener {
   
	private StopHandler mHandler;
	private static final int PROCESS_STOP = 1;
	private byte[] mMp3Buffer;
	private FileOutputStream mFileOutputStream;

	private static class StopHandler extends Handler {
   
		
		private DataEncodeThread encodeThread;
		
		public StopHandler(Looper looper, DataEncodeThread encodeThread) {
   
			super(looper);
			this.encodeThread = encodeThread;
		}

		@Override
		public void handleMessage(Message msg) {
   
			if (m