Android MediaCorder

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MediaRecorder

MediaRecorder使用来录制视频和音频常见的类，关于其的内容还是较为简单易学的，主要是针对其录制视频和音频的方法来熟悉这个类，并设置常见的参数。
mediaRecorder_states.jpg-20.6kB

音频录制

1.创建MediaRecorder的实例;
2.setAudioSource;设置音频的来源
3.setOutputFormat();设置输出格式
4.setAudioEncoder():设置音频的编码
5.setOutFile():设置生成文件
6.prepare:准备工作
7.start():开始录制
8.stop()/reset():结束
9.release():释放资源

public class MainActivity extends AppCompatActivity {    private Button recordAudio;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        recordAudio = (Button) findViewById(R.id.record_audio);        recordAudio.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                recordAudio();            }        });    }    //录制音频    private void recordAudio() {        MediaRecorder audioRecorder = new MediaRecorder();        audioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);        audioRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        audioRecorder.setOutputFile(getExternalCacheDir().getAbsolutePath()+"/audioRecord");        try {            //3s 自动结束            audioRecorder.setMaxDuration(3000);            audioRecorder.prepare();            audioRecorder.start();        } catch (IOException e) {            e.printStackTrace();        }    }}

录制视频

1.实例MediaCoder的例子
2.setVideoSource(): 设置视频来源
3.setOutputFormat():设置输出的格式
4.setVideoEncoder():设置视频编码
5.setVideoSize():设置视频的宽和高
6.setVideFrameRate:设置视频帧率
7.setPreviewDisplay:设置预览的界面
8.prepare():准备
9.start():开始录制
10.stop/reset:停止录制
11.release:释放资源

 private void recordVideo() {    videoRecorder = new MediaRecorder();    videoRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);    videoRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);    videoRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);    videoRecorder.setOutputFile(getExternalCacheDir().getAbsolutePath() + "/videoRecord");    videoRecorder.setVideoSize(640, 480);    videoRecorder.setVideoFrameRate(20);    videoRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());    try {        videoRecorder.setMaxDuration(8000);        videoRecorder.prepare();        videoRecorder.start();    } catch (IOException e) {        e.printStackTrace();    }}

encode和outputFormat的对应关系

https://developer.android.com/guide/appendix/media-formats.html

video：
video_encoder_outputformat.png-142.5kB
image:
image_encoder_outputformat.png-50.3kB
audio:
audio_encoder_outputformat_01.png-182.2kB
audio_encoder_outputformat_02.png-140.1kB
audio_encoder_outputformat_03.png-76kB

CamcorderProfile

我们可以直接设此参数，从而不需要设置一个帧率，编码，输出格式等参数。

private void recordVideo(int type) {    videoRecorder = new MediaRecorder();    videoRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);    videoRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);    CamcorderProfile camcorderProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_1080P);    videoRecorder.setProfile(camcorderProfile);    videoRecorder.setOutputFile(getExternalCacheDir().getAbsolutePath() + "/videoRecord_type");    videoRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());    videoRecorder.setMaxDuration(10000);    try {        videoRecorder.prepare();        videoRecorder.start();    } catch (IOException e) {        e.printStackTrace();    }}

关于MediaRecorder就介绍这么多了

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