MediaRecorder录像那些事

 1 mParams = mCamera.getParameters();
 2             mParams.setPictureFormat(ImageFormat.JPEG);//设置拍照后存储的图片格式
 3             mParams.setJpegQuality(100);//设置图片的质量
 4             mParams.setJpegThumbnailQuality(100);//设置缩略图的质量
 5             //设置PreviewSize和PictureSize
 6             Size pictureSize = CamParaUtil.getInstance().getPropPictureSize(mParams.getSupportedPictureSizes());
 7             mParams.setPictureSize(pictureSize.width, pictureSize.height);
 8             Size previewSize = CamParaUtil.getInstance().getPropPreviewSize(
 9                     mParams.getSupportedPreviewSizes(), previewRate, minWidth);
10             mParams.setPreviewSize(previewSize.width, previewSize.height);//设置预览SIze就清晰了
11             mCamera.setDisplayOrientation(90);
12 
13 private  Size getPropPreviewSize(List<Camera.Size> list, float th, int minWidth){
14 
15         int i = 0;
16         for(Size s:list){
17             if((s.width >= minWidth) && equalRate(s, th)){
18                 Log.i(TAG, "PreviewSize:w = " + s.width + "h = " + s.height);
19                 break;
20             }
21             i++;
22         }
23         if(i == list.size()){
24             i = 0;//如果没找到，就选最小的size
25         }
26         return list.get(i);
27     }
28 
29     private  Size getPropPictureSize(List<Camera.Size> list){
30         Size cameraSize = null;
31         if (list.size()>0) {
32             cameraSize=list.get(0);
33             for (Size size : list) {
34                 //小于100W像素
35                 if (size.width*size.height<100*10000) {
36                     cameraSize=size;
37                     break;
38                 }
39             }
40         }
41 
42         return cameraSize;
43     }
44 
45     private boolean equalRate(Size s, float rate){
46         float r = (float)(s.width)/(float)(s.height);
47         if(Math.abs(r - rate) <= 0.03)
48         {
49             return true;
50         }
51         else{
52             return false;
53         }
54     }

 1 if(mediarecorder == null)
 2                 mediarecorder = new MediaRecorder();// 创建mediarecorder对象
 3             else
 4                 mediarecorder.reset();
 5             mCamera.stopPreview();  //这行代码是为了解决设置预览Size太大，开始录像画面定住的问题
 6             mCamera.unlock();
 7             mediarecorder.setCamera(mCamera);
 8             // 设置录制视频源为Camera(相机)
 9             mediarecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
10             mediarecorder.setAudioSource(MediaRecorder.AudioSource.MIC); //录音源为麦克风
11             //设置输出视频朝向，便于播放器识别。由于是竖屏录制，需要正转90°
12             mediarecorder.setOrientationHint(90);
13             boolean boo = false;
14             try {
15                 // Set the recording profile.
16                 CamcorderProfile profile = null;
17                 if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
18                     if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_1080P))
19                         profile = CamcorderProfile.get(CamcorderProfile.QUALITY_1080P);
20                     else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_720P))
21                         profile = CamcorderProfile.get(CamcorderProfile.QUALITY_720P);
22                     else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_480P))
23                         profile = CamcorderProfile.get(CamcorderProfile.QUALITY_480P);
24                     else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_HIGH))
25                         profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
26                     if (profile != null){
27                         mediarecorder.setProfile(profile); 
28                         boo = true;
29                     }
30                 }
31             } catch (Exception e1) {
32                 e1.printStackTrace();
33             }
34             if(!boo){
35                 //设置了setProfile的话，下面的输出格式和编码需要注释
36                 // 设置录制完成后视频的封装格式THREE_GPP为3gp.MPEG_4为mp4
37                 mediarecorder
38                 .setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
39                 // 设置录制的视频编码h264
40                 mediarecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
41                 mediarecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);//音频编码
42                 mediarecorder.setVideoEncodingBitRate(5*1024*1024);
43                 mediarecorder.setVideoFrameRate(15);
44             }
45             mediarecorder.setPreviewDisplay(holder.getSurface());
46             mediarecorder.setMaxDuration(15 * 1000);
47 
48             mediarecorder.setOutputFile(videoFile.getPath());
49             try {
50                 // 准备录制
51                 mediarecorder.prepare();
52                 // 开始录制
53                 mediarecorder.start();
54             } catch (IllegalStateException e) {
55                 e.printStackTrace();
56             } catch (IOException e) {
57                 e.printStackTrace();
58             }