摄像头video分辨率设置问题

进入video种高低视频画质和YOUTOBE之分。想问下，在选择高或者低画质时是调用了什么函数设置了width和high的。
在videocamera.JAVA中做了
    private void readVideoPreferences() {
        String quality = mPreferences.getString(
                CameraSettings.KEY_VIDEO_QUALITY,
                CameraSettings.DEFAULT_VIDEO_QUALITY_VALUE);        boolean videoQualityHigh = CameraSettings.getVideoQuality(quality);        // Set video quality.
        Intent intent = getIntent();
        if (intent.hasExtra(MediaStore.EXTRA_VIDEO_QUALITY)) {
            int extraVideoQuality =
                    intent.getIntExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
            videoQualityHigh = (extraVideoQuality > 0);
        }        // Set video duration limit. The limit is read from the preference,
        // unless it is specified in the intent.
        if (intent.hasExtra(MediaStore.EXTRA_DURATION_LIMIT)) {
            int seconds =
                    intent.getIntExtra(MediaStore.EXTRA_DURATION_LIMIT, 0);
            mMaxVideoDurationInMs = 1000 * seconds;
        } else {
            mMaxVideoDurationInMs =
                    CameraSettings.getVidoeDurationInMillis(quality);
        }
        mProfile = CamcorderProfile.get(mCameraId,
                videoQualityHigh
                ? CamcorderProfile.QUALITY_HIGH
                : CamcorderProfile.QUALITY_LOW);
    }
但只是read，不知道set是在哪了做的？
所以现在的问题是在点了低画质后，参数width和high是在哪了做了重新设定？