Camera lock

I had a conflict that how to use Camera.lock.
But at last I got how to use Camera.lock() API.

Camera.lock() API is....
For example, first set camera parameter, second record camera image.

Reference document here. it is  android developer site.

My source code here.

add more MediaRecorder API 2

I try setOutputFormat and setVideoEncoder.

_recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

_recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);

but RAW_AMR is audio only.

_recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);

_recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);

_recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

try setVideoEncodingBitRate()

_recorder.setVideoEncodingBitRate(10000000);

try setVideoFrameRate()

_recorder.setVideoFrameRate(5);

setVideoSize

_recorder.setVideoSize(100, 100);

If set odd size, app comes exception.

source code here

Add more MediaRecorder API

I used MediaRecorder API follow:

setMaxDuration()
setMaxFileSize()
setOnErrorListener()
setOnInfoListener()
setOrientationHint()

callback function for max duration and max file size.

MediaRecorder.OnInfoListener mInfoListener = new MediaRecorder.OnInfoListener() {
 @Override
 public void onInfo(MediaRecorder mr, int what, int extra) {
  // TODO Auto-generated method stub
  switch (what) {
  case MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED :
   _recorder.stop();
   _recorder.reset();
   _isRecording = false;
   Log.d("camera", "stop");
   Log.d("camera", "onInfo=" +  MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED);
   break;
  case MediaRecorder.MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED :
   _recorder.stop();
   _recorder.reset();
   _isRecording = false;
   Log.d("camera", "stop");
   Log.d("camera", "onInfo=" +  MediaRecorder.MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED);
   break;
  case MediaRecorder.MEDIA_RECORDER_INFO_UNKNOWN :
   Log.d("camera", "onInfo=" +  MediaRecorder.MEDIA_RECORDER_INFO_UNKNOWN);
   break;
  }
 }
};

set max duration if duration is 30 second, call onInfo().

_recorder.setMaxDuration(30000); //max 30 seconds

set max file size if file size is 40 M bytes, call onInfo().

_recorder.setMaxFileSize(40000000); //max 40M bytes

set orientation. it change orientation at playback only.

_recorder.setOrientationHint(0);

source code here.

setDisplayOrientation

I used setDisplayOrientation().

It is exception to do setDisplayOrientation, while camera do preview.

Do it between stopPreview and startPreview

camera.stopPreview();
camera.setDisplayOrientation(result);
camera.startPreview();

There are the Reference code at Android Developer Page follow:

android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();

android.hardware.Camera.getCameraInfo(cameraId, info);

int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
int degrees = 0;
switch (rotation) {
    case Surface.ROTATION_0: degrees = 0; break;
    case Surface.ROTATION_90: degrees = 90; break;
    case Surface.ROTATION_180: degrees = 180; break;
    case Surface.ROTATION_270: degrees = 270; break;
}

int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
    result = (info.orientation + degrees) % 360;
    result = (360 - result) % 360;  // compensate the mirror
} else {  // back-facing
    result = (info.orientation - degrees + 360) % 360;
}

Log.d("camera", "result= " + result);
camera.stopPreview();
camera.setDisplayOrientation(result);
camera.startPreview();

source code here

NexusOne AudioSource

My android is NexusOne. When I called setAudioSource(...), it became exception. oh my god.

setOneShotPreviewCallback

Once register callback, one time be done callback.

It is callback function.

private Camera.PreviewCallback mPreviewListener = new Camera.PreviewCallback() {
 @Override
 public void onPreviewFrame(byte[] data, Camera camera) {
  Log.d("camera", "onPreviewFrame size=" + data.length);
 }
};

register callback.

_camera.setOneShotPreviewCallback(mPreviewListener);

Every time you touch, you can register a function callback, we confirmed that the function is called callback.

source code here.

setPreviewCallback

I check setPreviewCallback.

It is API to receive every camera frame.

But I found callback timing no strict interval.

10-10 13:50:13.580: DEBUG/camera(684): onPreviewFrame size=230400
10-10 13:50:13.670: DEBUG/camera(684): onPreviewFrame size=230400
10-10 13:50:13.710: DEBUG/camera(684): onPreviewFrame size=230400
10-10 13:50:13.770: DEBUG/camera(684): onPreviewFrame size=230400

calback function.

private Camera.PreviewCallback mPreviewListener = new Camera.PreviewCallback() {
 @Override
 public void onPreviewFrame(byte[] data, Camera camera) {
  Log.d("camera", "onPreviewFrame size=" + data.length);
 }
};

register callback.

_camera.setPreviewCallback(mPreviewListener);

unregister callback.

_camera.setPreviewCallback(null);

source code here.

get thumbnail from video

I used ThumbnailUtils. It create thumbnail from video file.

get thumbnail

Bitmap bmp = ThumbnailUtils.createVideoThumbnail("/sdcard/sample.3gp",MediaStore.Video.Thumbnails.MINI_KIND );

And I add thumbnail to table view.

ImageView image = new ImageView(this);
image.setImageBitmap(bmp);
tablelayout.addView(image, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));

source code here.

MediaScannerConnection

I would like to register taken video in gallery.
I used MediaScannerConnection.
Register video.

MediaScannerConnection.scanFile(this, "/sdcard/sample.3gp", "video/3gpp", null);

It is simple. it is all.
Let see your gallery.

source code here

MediaRecorder

I use MediaRecorder class.

I set up SurfaceView.

SurfaceView mySurfaceView = (SurfaceView) findViewById(R.id.surfaceView1);
SurfaceHolder holder = mySurfaceView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

And set up SurfaceHolder.Callback

public void surfaceCreated(SurfaceHolder holder) {
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
 _holder = holder;
}
public void surfaceDestroyed(SurfaceHolder holder) {
}

Create MediaRecorder

_recorder = new MediaRecorder();

Initialize MediaRecorder and start it.

_recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
_recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
_recorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
_recorder.setOutputFile("/sdcard/sample.3gp");
_recorder.setPreviewDisplay(_holder.getSurface());
try {
 _recorder.prepare();
} catch (Exception e) {
 Log.e("test", "recorder error");
}
_recorder.start();

stop it.

_recorder.stop();
_recorder.reset();

source code here

Actually, I would like to try Camera class and Camera.lock() method. but it has exception. in my NexusOne.

getThumbnails

I used getThumbnails() to video in gallery.


Get ContentResolver

ContentResolver contentresolver = getContentResolver();

Get video content list from sdcard.

Cursor cursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null, null);

move first a pointer of video list.

cursor.moveToFirst();

Get thumbnail.

Bitmap bmp = MediaStore.Video.Thumbnails.getThumbnail(contentresolver, id, MediaStore.Video.Thumbnails.MICRO_KIND, null);

After I put Bitmap at Table view.
source code here.

FaceDetector

I　use FaceDetector class.
FaceDetector class need Bitmap class.

First get Bitmap.

Bitmap bitmapimage = BitmapFactory.decodeFile("/sdcard/face.jpg");

Get FaceDetector class

FaceDetector facedetector = new FaceDetector(bitmapimage.getWidth(), bitmapimage.getHeight(), 10);

Get face analysis result.

int num = facedetector.findFaces(bitmapimage, faces);

view result
MidPoint is center coordinate　of face .

Log.d("test", "confidence = " + faces[i].confidence());
Log.d("test", "eyesDistance = " + faces[i].eyesDistance());
PointF point = new PointF();
faces[i].getMidPoint(point);
Log.d("test", "MidPoint x = " + point.x + " y=" + point.y);
Log.d("test", "euler x = " + faces[i].pose(Face.EULER_X));
Log.d("test", "euler y = " + faces[i].pose(Face.EULER_Y));
Log.d("test", "euler x = " + faces[i].pose(Face.EULER_Z));

sourcecode here

ExifInterface

ExifInterface　access in jpeg exif header.

Create class

ExifInterface exif = null;
exif = new ExifInterface("/sdcard/test.jpg");

exsample getting attribute
for string

Log.d("test", "FNumber=" + exif.getAttribute("FNumber"));

for int

Log.d("test", "Flash=" + exif.getAttributeInt("Flash", 0));

for double

Log.d("test", "FocalLenght=" + exif.getAttributeDouble("FocalLenght", 0));

It is possible to get thumbnail

if (exif.hasThumbnail()) {
 outputFile(exif.getThumbnail());
}

source code here

CameraProfile

CameraProfile class give　me quality parameter for jpeg encoder.

 get quality for High

int quality  = CameraProfile.getJpegEncodingQualityParameter(CameraProfile.QUALITY_HIGH);
Log.d("test", "QUALITY_HIGH=" + quality);

for medium

quality  = CameraProfile.getJpegEncodingQualityParameter(CameraProfile.QUALITY_MEDIUM);
Log.d("test", "QUALITY_MEDIUM=" + quality);

for low

quality  = CameraProfile.getJpegEncodingQualityParameter(CameraProfile.QUALITY_LOW);
Log.d("test", "QUALITY_LOW=" + quality);

source code here

my android result

QUALITY_HIGH=90
QUALITY_MEDIUM=80
QUALITY_LOW=70

This quality paramter is used for setJpegQuality().
setJpegQuality() sample source code

CamcorderProfile

I used CamcorderProfile.

Get profile.

CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);

View parameter,

Log.d("test","quality= " +  profile.quality);
Log.d("test","autoBitRate= " +  profile.audioBitRate);
Log.d("test","audioChannels= " +  profile.audioChannels);
Log.d("test","audioCodec= " +  profile.audioCodec);
Log.d("test","audioSampleRate= " +  profile.audioSampleRate);
Log.d("test","duration= " +  profile.duration);
Log.d("test","fileformat= " +  profile.fileFormat);
Log.d("test","videoBitRate= " +  profile.videoBitRate);
Log.d("test","videocodec= " +  profile.videoCodec);
Log.d("test","videoFrameHeight= " +  profile.videoFrameHeight);
Log.d("test","videoFrameRate= " +  profile.videoFrameRate);
Log.d("test","videoFrameWidth= " +  profile.videoFrameWidth);

The Version is Android 2.3.1. CamcorderProfile has QUALITY_HIGH and QUALITY_LOW. I don't know how to get other profile. My android result follow QUALITY_HIGH

quality= 1
autoBitRate= 96000
audioChannels= 1
audioCodec= 3
audioSampleRate= 16000
duration= 60
fileformat= 2
videoBitRate= 3000000
videocodec= 2
videoFrameHeight= 480
videoFrameRate= 27
videoFrameWidth= 720

QUALITY_LOW

quality= 0
autoBitRate= 12200
audioChannels= 1
audioCodec= 1
audioSampleRate= 8000
duration= 30
fileformat= 1
videoBitRate= 256000
videocodec= 3
videoFrameHeight= 144
videoFrameRate= 27
videoFrameWidth= 176

source code here