一个音视频播放问题跪求大佬解答

最新推荐文章于 2024-04-23 15:04:57 发布

原创最新推荐文章于 2024-04-23 15:04:57 发布 · 896 阅读

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本文介绍了一个使用Android系统的应用程序如何实现音频的录制和播放功能。文章详细展示了通过AudioRecord和MediaPlayer API来完成音频数据的捕获及回放的全过程，并讨论了在实际应用中遇到的一些常见问题。

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package com.example.qundui.recordlearn;

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import java.io.File;
import java.io.IOException;
/**
 * Created by qundui on 2018/3/5.
 */
public class AudioRecordTest extends AppCompatActivity {
    //设置音频数据格式:PCM 16位每个样本，保证设备支持。PCM 8位每个样本，不一定能得到设备的支持。
    private int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
    //设置音频的录制声道，CHANNEL_IN_STEREO为双声道，CHANNEL_CONFIGURATION_MONO为单声道
    private static int channelConfig = AudioFormat.CHANNEL_IN_STEREO;
    private int frequence = 8000; //录制频率，单位hz.这里的值注意了，写的不好，
    //设置音频的采样率，44100是目前的标准，但是某些设备仍然支持22050,16000,11025
    private static int sampleRateInHz = 44100;
    private boolean isRecord = false;
    private AudioRecord audioRecord;
    private int bufferSizeInBytes = 0;//缓冲区大小
    //AudioName裸音频数据文件
     String AudioName ;
    //NewAudioName可播放的音频文件
     String NewAudioName ;
    private MediaPlayer mediaPlayer;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.record);
        //创建播放实例
        String path = getExternalCacheDir().getPath();
        mediaPlayer = new MediaPlayer();

        AudioName = path + "/reav.wav";
        NewAudioName = path + "/yinyue.raw";
    }
    public void record(View view) {
        bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioEncoding);
        audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioEncoding, bufferSizeInBytes);
        audioRecord.startRecording();
        isRecord = true;
        new MyTread().start();//开始录制声音
        Log.i("gsc","开始录制声音");
    }

    /**
     * @param view 停止播放
     */
    public void stop(View view) {
        if (audioRecord != null) {
            audioRecord.stop();
            audioRecord.release();
            //停止写入音频文件
            isRecord = false;
            audioRecord = null;

        }
        Log.i("gsc","停止录制声音");
    }
    class MyTread extends Thread {
        @Override
        public void run() {
            super.run();
            SoundUtils.writeDataToFile(bufferSizeInBytes, AudioName, isRecord, audioRecord);//把录制的音频裸数据写入到文件中去
            SoundUtils.copyWaveFile(AudioName, NewAudioName, sampleRateInHz, bufferSizeInBytes);//给裸数据加上头文件

        }
    }
    private final class PrepareListener implements MediaPlayer.OnPreparedListener {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mediaPlayer.start();//开始播放
            Log.i("gsc","开始播放录制声音");
        }
    }

    /**
     * @param view 开始播放
     */
    public void play(View view) {
        System.out.println("----开始播放000000----");
        System.out.println("----NewAudioName-----"+NewAudioName);
        File file = new File(NewAudioName);
        System.out.println("--------"+file.exists());
        mediaPlayer.reset();
        try {
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setDataSource(NewAudioName);//问题就在这里![这里写图片描述](https://img-blog.youkuaiyun.com/20180306212251513?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMzA1MTkzNjU=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)
//            mediaPlayer.setDataSource(this, Uri.parse(NewAudioName));
            mediaPlayer.prepare();//进行数据缓冲

            mediaPlayer.setOnPreparedListener(new PrepareListener());
        } catch (IOException e) {
            e.printStackTrace();
        }


        System.out.println("----开始播放0000008899----");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        stop(null);
        if (mediaPlayer != null) {
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }
}
log 日志：
```![这里写图片描述](http://img.blog.youkuaiyun.com/20180306212310647?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMzA1MTkzNjU=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70)
修改后的代码：





<div class="se-preview-section-delimiter"></div>

```package com.example.qundui.recordlearn;

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import java.io.File;
import java.io.IOException;
/**
 * Created by qundui on 2018/3/5.
 */
public class AudioRecordTest extends AppCompatActivity {
    //设置音频数据格式:PCM 16位每个样本，保证设备支持。PCM 8位每个样本，不一定能得到设备的支持。
    private int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
    //设置音频的录制声道，CHANNEL_IN_STEREO为双声道，CHANNEL_CONFIGURATION_MONO为单声道
    private static int channelConfig = AudioFormat.CHANNEL_IN_STEREO;
    private int frequence = 8000; //录制频率，单位hz.这里的值注意了，写的不好，
    //设置音频的采样率，44100是目前的标准，但是某些设备仍然支持22050,16000,11025
    private static int sampleRateInHz = 44100;
    private boolean isRecord = false;
    private AudioRecord audioRecord;
    private int bufferSizeInBytes = 0;//缓冲区大小
    **//AudioName裸音频数据文件  ## 标题 ##
    private static final String AudioName = "/sdcard/love.raw";
    //NewAudioName可播放的音频文件  
    private static final String NewAudioName = "/sdcard/new.wav";**

    private MediaPlayer mediaPlayer;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.record);
        //创建播放实例
        String path = getExternalCacheDir().getPath();
        mediaPlayer = new MediaPlayer();

//        AudioName = path + "/reav.wav";
//        NewAudioName = path + "/yinyue.raw";
    }
    public void record(View view) {
        bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioEncoding);
        audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioEncoding, bufferSizeInBytes);
        audioRecord.startRecording();
        isRecord = true;
        new MyTread().start();//开始录制声音
        Log.i("gsc","开始录制声音");
    }

    /**
     * @param view 停止播放
     */
    public void stop(View view) {
        if (audioRecord != null) {
            audioRecord.stop();
            audioRecord.release();
            //停止写入音频文件
            isRecord = false;
            audioRecord = null;

        }
        Log.i("gsc","停止录制声音");
    }
    class MyTread extends Thread {
        @Override
        public void run() {
            super.run();
            SoundUtils.writeDataToFile(bufferSizeInBytes, AudioName, isRecord, audioRecord);//把录制的音频裸数据写入到文件中去
            SoundUtils.copyWaveFile(AudioName, NewAudioName, sampleRateInHz, bufferSizeInBytes);//给裸数据加上头文件

        }
    }
    private final class PrepareListener implements MediaPlayer.OnPreparedListener {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mediaPlayer.start();//开始播放
            Log.i("gsc","开始播放录制声音");
        }
    }

    /**
     * @param view 开始播放
     */
    public void play(View view) {
        System.out.println("----开始播放000000----");
        System.out.println("----NewAudioName-----"+NewAudioName);
        File file = new File(NewAudioName);
        System.out.println("--------"+file.exists());
        mediaPlayer.reset();
        try {
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setDataSource(NewAudioName);
//            mediaPlayer.setDataSource(this, Uri.parse(NewAudioName));
            mediaPlayer.prepare();//进行数据缓冲

            mediaPlayer.setOnPreparedListener(new PrepareListener());
        } catch (IOException e) {
            e.printStackTrace();
        }


        System.out.println("----开始播放0000008899----");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        stop(null);
        if (mediaPlayer != null) {
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }
}

这里写代码片