微信开发-将amr格式转换为mp3格式

有个需求是要在微信浏览器录音,然后上传,此处使用jssdk提供的录音接口,录完后会上传微信服务器并返回音频id,由于微信服务器只存3天时间,所以我们需要把文件下载到自己服务器进行维护,下载后的格式是.amr的,由于我需要在页面使用audio标签进行播放,但是有音频格式限制,需要转换为mp3,所以记录下.

下载音频代码:

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Describe:从微信服务器下载音频
 * Author:陆小不离
 * Age:Eighteen
 * Time:2017年5月18日 下午1:21:07
 */
public class VoiceDownload {  
    /** 
     * 根据文件id下载文件 
     * @param mediaId 
     *            媒体id 
     *  
     * @throws Exception 
     */  
    public static InputStream getInputStream(String accessToken, String mediaId) {  
        InputStream is = null;  
        String url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token="  
                + accessToken + "&media_id=" + mediaId;  
        try {  
            URL urlGet = new URL(url);  
            HttpURLConnection http = (HttpURLConnection) urlGet  
                    .openConnection();  
            http.setRequestMethod("GET"); // 必须是get方式请求  
            http.setRequestProperty("Content-Type",  
                    "application/x-www-form-urlencoded");  
            http.setDoOutput(true);  
            http.setDoInput(true);  
            System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒  
            System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒  
            http.connect();  
            // 获取文件转化为byte流  
            is = http.getInputStream();  
  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return is;
    }
  
    /** 
     *  
     * 获取下载图片信息（jpg） 
     *  
     *  
     *  
     * @param mediaId 
     *  
     *            文件的id 
     *  
     * @throws Exception 
     */  
  
    public static void saveImageToDisk(String accessToken, String mediaId, String picName, String picPath)  
            throws Exception {  
        InputStream inputStream = getInputStream(accessToken, mediaId); 
        String filePath = picPath+picName+".amr";
        byte[] data = new byte[10240];  
        int len = 0;  
        FileOutputStream fileOutputStream = null;  
        try {  
            fileOutputStream = new FileOutputStream(filePath);  
            while ((len = inputStream.read(data)) != -1) {  
                fileOutputStream.write(data, 0, len);  
            }
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
            if (inputStream != null) {  
                try {  
                    inputStream.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
            if (fileOutputStream != null) {  
                try {  
                    fileOutputStream.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }
            //生成对应mp3格式
            ChangeAudioFormat.changeToMp3(filePath, picPath+picName+".mp3");
        }
    }  
  
    
    public static void main(String[] args) {
        String token = "HlEl1p9pJ3oe1EnKZa5bz7R1-qdkoI9OCkvy2v4geOhBY60o0-z3s4vybzR_WztYyuGSEPZh8dnWd2zukCq-YVsRNfdfkYkKKyhxTgZAYV-nYFBly7nRwKyY-uj4MHGEBNQgAEANZC";
        String mediaId = "r64ELwHiJndHHyhD94X887mLVEPXyw2RLoer8Nr3JkaI_tYc4J7uw2lOl55Hv8hI";
        try {
            saveImageToDisk(token,mediaId,"test2","D:\ttt\");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}  

将amr转换为mp3,需要依赖一个jar,此jar的下载地址为: http://www.sauronsoftware.it/projects/jave/download.php  ,使用此jar进行格式转换会因系统不同而需要不用版本的jar,具体请下载对应版本.

import it.sauronsoftware.jave.AudioAttributes;  
import it.sauronsoftware.jave.Encoder;  
import it.sauronsoftware.jave.EncoderException;  
import it.sauronsoftware.jave.EncodingAttributes;  
import it.sauronsoftware.jave.InputFormatException;  
import java.io.File;  

public class ChangeAudioFormat {
       public static void main(String[] args) throws Exception {  
            String path1 = "D:\apache-tomcat-8.0.36\webapps\upload\voice\start.amr";  
            String path2 = "D:\apache-tomcat-8.0.36\webapps\upload\voice\end.mp3";  
            changeToMp3(path1, path2);  
        } 
      
        public static void changeToMp3(String sourcePath, String targetPath) {  
            File source = new File(sourcePath);  
            File target = new File(targetPath);  
            AudioAttributes audio = new AudioAttributes();  
            Encoder encoder = new Encoder();  
      
            audio.setCodec("libmp3lame");  
            EncodingAttributes attrs = new EncodingAttributes();  
            attrs.setFormat("mp3");  
            attrs.setAudioAttributes(audio);  
      
            try {  
                encoder.encode(source, target, attrs);  
            } catch (IllegalArgumentException e) {  
                e.printStackTrace();  
            } catch (InputFormatException e) {  
                e.printStackTrace();  
            } catch (EncoderException e) {  
                e.printStackTrace();  
            }
        }
}

转换时会抛异常,不用管我们只要关注结果就好,结果就是转换成功并且成功使用audio播放~

　　it.sauronsoftware.jave.EncoderException:   Duration: N/A, bitrate: N/A
    at it.sauronsoftware.jave.Encoder.encode(Encoder.java:863)
    at it.sauronsoftware.jave.Encoder.encode(Encoder.java:713)
    at com.infogather.util.ChangeAudioFormat.changeToMp3(ChangeAudioFormat.java:29)
    at com.infogather.util.ChangeAudioFormat.main(ChangeAudioFormat.java:14)

页面这么写:

　　<audio controls="" preload="auto" style="100%;padding:6px 0">
　　　　<source src="/upload/voice/end.mp3" type="audio/mp3">
　　　　<source src="/upload/voice/end.amr">
　　</audio>

因为chrome,firefox等等一些浏览器对于这个audio标签的支持解析的音频格式还不一样,所以我们需要罗列出多种类型以便确保浏览器兼容.

原创-转载请联系huage