导言

解码过程

Mp3结构

MP3 文件一般分为三部分：ID3V2，Frame，ID3V1也属于帧，叫标签帧，Frame 部分叫数据帧，在MP3 文件内不一定有标签帧，但一定有数据帧.

ID3V2解析

开始处，长度为10字节，结构如下:

标签头

    public static int discard(int num){int result = 0, mask = 0x7F;while ((mask ^ 0x7FFFFFFF)==1){result = num & ~mask;result <<= 1;result |= num & mask;mask = ((mask + 1) << 8) - 1;num = result;}return result;}

恢复：

    public static int recovery(int num) {byte[] D = new byte[4];D[0] = (byte) (num & 0xff);D[1] = (byte) (num >> 8 & 0xff);D[2] = (byte) (num >> 16 & 0xff);D[3] = (byte) (num >> 24 & 0xff);int Result = 0x0;Result = Result | D[0];Result = Result | (D[1] << 7);Result = Result | (D[2] << 14);Result = Result | (D[3] << 21);return Result;}

标签帧

Frame解析-标签帧

所有的Mp3文件的数据帧开始的两个字节都必需是“FF FA”或者 “FF FB”。

帧长计算

MPEG帧的采样表

每帧播放时长

ID3V1尾部说明

Mp3解码还原流程

MP3解码经MP3编码方式压缩后的音频数据还原成原始PCM数据的过程。

解码导言

上代码

最适合新手的，最快捷的

import IOS_SHOGUN_Component.__response;
import IOS_SHOGUN_Component.decodeAean.Mp3DecodeException;import javax.sound.sampled.SourceDataLine;
import java.io.*;
public class Java {public static void main(String[] X) throws IOException {try {try (SourceDataLine Mp3 = __response.Debug_PlayMp3("Mp3地址")) {}} catch (Mp3DecodeException e) {throw new RuntimeException(e);}}
}

直接导出数据

两种存储方式

TaskList<String>方式

内容:

注意:

import IOS_SHOGUN_Component.TaskList;
import IOS_SHOGUN_Component.__response;
import IOS_SHOGUN_Component.decodeAean.Mp3DecodeException;
import java.io.*;
public class Java {public static void main(String[] X) throws IOException {try {TaskList<String> Data=__response._mp3_extract_mode_Base64("路径");//保存了每一帧的PCM解码数据byte[] PCM=__response._base64_T_X2(Data.get(0));} catch (Mp3DecodeException e) {throw new RuntimeException(e);}}
}

流方式

import IOS_SHOGUN_Component.__response;
import IOS_SHOGUN_Component.decodeAean.Mp3DecodeException;
import java.io.*;
public class Java {public static void main(String[] X) throws IOException {try {ByteArrayInputStream I=__response._mp3_extract_mode_IStream("路径");ByteArrayOutputStream O=__response._mp3_extract_mode_OStream("路径");} catch (Mp3DecodeException e) {throw new RuntimeException(e);}}
}

快捷方式还有很多

你也可以直接导出成pcm格式文件

Mp3是缓存数据不是-本地数据怎么提取转换成Pcm数据?

翻译成ByteArrayInputStream

翻译成ByteArrayOutputStream

非快捷方式

import IOS_SHOGUN_Component.decodeAean.AudioBuffer;
import IOS_SHOGUN_Component.decodeAean.DecodeSuperclasses;
import IOS_SHOGUN_Component.decodeAean.Header;
import IOS_SHOGUN_Component.decodeAean.Mp3DecodeException;
import IOS_SHOGUN_Component.mp3_Decode;import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import java.io.*;
public class Java {public static void main(String[] X) throws IOException, Mp3DecodeException {mp3_Decode Create = new mp3_Decode(new mp3_Decode.Audio(), AudioBuffer.STREAM, mp3_Decode.LocalData);Create.open("路径/流的方式", false);if (Create.onCreateAndStart()) {DecodeSuperclasses DECODE = Create.getPCM_DecodeSuperclasses();Header Head = DECODE.getRecording();AudioFormat af = new AudioFormat((float) Head.getSamplingRate(), 16, Head.getChannels(), true, false);SourceDataLine DataLineSource;try {DataLineSource = AudioSystem.getSourceDataLine(af);} catch (LineUnavailableException var8) {throw new RuntimeException(var8);}try {DataLineSource.open(af, 8 * Head.getPcmSize());} catch (LineUnavailableException var7) {throw new RuntimeException(var7);}DataLineSource.start();ByteArrayInputStream D = DECODE.getAudioBuffer().getPcmDataExportIStream();byte[] DD = new byte[DECODE.getAudioBuffer().getOffset()];while (D.read(DD) != -1) {DataLineSource.write(DD, 0, DD.length);}}}
}

import IOS_SHOGUN_Component.*;
import IOS_SHOGUN_Component.decodeAean.AudioBuffer;
import IOS_SHOGUN_Component.decodeAean.Mp3DecodeException;
import java.io.*;
public class Java {public static void main(String[] X) throws IOException, Mp3DecodeException {//参数Audio，音频输出类，存储方式，是否是本地引入/缓存引入(CacheData)，缓存引入时，它只能执行转化程序。mp3_Decode.Audio a=new mp3_Decode.Audio();mp3_Decode Create = new mp3_Decode(a, AudioBuffer.STREAM, mp3_Decode.LocalData);Create.open("流/路径", true);if (Create.onCreateAndStart()){//创建解码向导};}
}

import IOS_SHOGUN_Component.*;
import IOS_SHOGUN_Component.decodeAean.AudioBuffer;
import IOS_SHOGUN_Component.decodeAean.Mp3DecodeException;
import java.io.*;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.TimeUnit;public class Java {public static void main(String[] X) throws IOException, Mp3DecodeException {SequenceCachedPool C=new SequenceCachedPool(1,2,100, TimeUnit.MILLISECONDS,new LinkedBlockingDeque<>(10));//创建一个池做操作控制//参数Audio，音频输出类，存储方式，是否是本地引入/缓存引入(CacheData)，缓存引入时，它只能执行转化程序。mp3_Decode.Audio a=new mp3_Decode.Audio();mp3_Decode Create = new mp3_Decode(a, AudioBuffer.STREAM, mp3_Decode.LocalData);Create.open("流/路径", true);C.submit(()->{try {TimeUnit.SECONDS.sleep(5);Create.close();//5秒后退出} catch (InterruptedException e) {throw new RuntimeException(e);}});if (Create.onCreateAndStart()){//创建解码向导};}
}

更推荐这样做

代码

import IOS_SHOGUN_Component.*;
import IOS_SHOGUN_Component.decodeAean.AudioBuffer;
import IOS_SHOGUN_Component.decodeAean.Mp3DecodeException;
import java.io.*;
public class Java {public static void main(String[] X) throws IOException, Mp3DecodeException {//注意这里必须是AudioBuffer.BASE64,不然不管以任何方式获取base64的PCM纯音频数据都将为空!mp3_Decode Create = new mp3_Decode(new mp3_Decode.Audio(), AudioBuffer.BASE64, mp3_Decode.LocalData);Create.open("D:\\WindowsDataStorageFolder\\CSDN2.mp3", false);//为false只做转化if (Create.onCreateAndStart()){TaskList<String> Data=Create.getPCM_dataLine().getPcmDataTaskList();//或者//TaskList<String> Data=Create.getPCM_DecodeSuperclasses().getAudioBuffer().getPcmDataTaskList();console.success("数据总长%s".formatted("PCM数据段总长->"+Data.getBase64Statistics()));};}
}

结尾

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