Class VideoCaptureConstraints

java.lang.Object
com.codename1.capture.VideoCaptureConstraints
public class VideoCaptureConstraints extends Object

Encapsulates constraints that can be used for capturing video.

You should set the preferred constraints then if they are supported using #isSupported(), #isSizeSupported(), #isQualitySupported(), #isMaxLengthSupported(), or #isMaxFileSizeSupported(). If all of the constraints are supported, then, #isSupported() will return true, and the resolved constraints (#getWidth(), #getHeight(), #getQuality(), #getMaxLength(), #getMaxLength()) will match their preferred counterparts.

If #isSupported() is false, then at least one of the constraints is not supported by the system. You can check support for a specific constraint using #isSizeSupported(), #isMaxFileSizeSupported(), #isQualitySupported(), or #isMaxLengthSupported().

Example Using size and duration constraints:

`// Create capture constraint 320x240, with max length 20 seconds
VideoCaptureConstraints vcc = new VideoCaptureConstraints(320, 240, 20);
if (vcc.isSupported()) {
    // These constraints are fully supported by this platform
    // We can pass them directly to Capture.captureVideo() and the resulting
    // video will match the constraints exactly.
    // At this point, the following conditions are guaranteed to be true:
    // 1. vcc.getPreferredWidth() == vcc.getWidth() == 320
    // 2. vcc.getPreferredHeight() == vcc.getHeight() == 320
    // 3. vcc.getPreferredMaxLength() == vcc.getMaxLength() == 20` else {
    // At least one of the constraints is not supported.
    // You can find out the "granted" constraints using getWidth(), getHeight(),
    // and getMaxLength().
}
}

Example Using Quality:

`//
VideoCaptureConstraints vcc = new VideoCaptureConstraints(VideoCaptureConstraints.QUALITY_LOW);
if (vcc.isSupported()) {
    // This platform supports a 'low quality' setting.
    //  Low quality generally means a smaller file size.` else {
    // Low quality constraint is not supported.
}
}

Platform Support Status

Android #preferredQuality(int), #preferredMaxLength(int), and #preferredMaxFileSize(long) natively. It doesn't fully support specific widths and heights, but if #preferredWidth(int), and #preferredHeight(int) are supplied, it will translate these into either #QUALITY_LOW, or #QUALITY_HIGH.

Javascript supports .... TODO Add support for javascript and others

  • Field Details

  • Constructor Details

    • VideoCaptureConstraints

      public VideoCaptureConstraints()
      Creates a new video cosntraint with no constraints specified.

    • VideoCaptureConstraints

      public VideoCaptureConstraints(VideoCaptureConstraints toCopy)

      Copy constructor.

      Parameters
      • toCopy

    • VideoCaptureConstraints

      public VideoCaptureConstraints(int quality)

      Creates a new constraint with the given quality constraint.

      Parameters
      • quality: The quality of the constraint. Should be one of #QUALITY_LOW or #QUALITY_HIGH

    • VideoCaptureConstraints

      public VideoCaptureConstraints(int width, int height, int maxLength)

      Creates a new constraints with given preferred values.

      Parameters

      • width: The preferred width. Pass 0 for no constraint.

      • height: The preferred height. Pass 0 for no constraint.

      • maxLength: The preferred max length in seconds. Pass 0 for no consraint.

  • Method Details

    • init

      public static void init(VideoCaptureConstraints.Compiler cmp)

      Sets the native platform constraint compiler. Should be called once during platform initialization.

      Parameters
      • cmp
      Deprecated

      Called by the platform. For internal use only.

    • toString

      public String toString()
      Description copied from class: Object
      Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method. The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of: getClass().getName() + '@' + Integer.toHexString(hashCode())
      Overrides:
      toString in class Object

    • equals

      public boolean equals(Object obj)
      Description copied from class: Object
      Indicates whether some other object is "equal to" this one. The equals method implements an equivalence relation: It is reflexive: for any reference value x, x.equals(x) should return true. It is symmetric: for any reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true. It is transitive: for any reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true. It is consistent: for any reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the object is modified. For any non-null reference value x, x.equals(null) should return false. The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any reference values x and y, this method returns true if and only if x and y refer to the same object (x==y has the value true).
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Description copied from class: Object
      Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable. The general contract of hashCode is: Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result. It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables. As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)
      Overrides:
      hashCode in class Object

    • getMaxFileSize

      public long getMaxFileSize()

      Gets the maximum file size of the capture in bytes.

      Returns

      The max file size.

      See also
      • #preferredMaxFileSize(long)

    • preferredMaxFileSize

      public VideoCaptureConstraints preferredMaxFileSize(long size)

      Sets the preferred max file size.

      Parameters
      • size: The max file size in bytes.
      Returns

      Self for chaining

      See also

      • #getMaxFileSize()

      • #isMaxFileSizeSupported()

    • getPreferredMaxFileSize

      public long getPreferredMaxFileSize()

      Gets the preferred max file size.

      Returns

      The preferred max file size, in bytes.

      See also

      • #preferredMaxFileSize(long)

      • #getMaxFileSize()

      • #isMaxFileSizeSupported()

    • getMaxLength

      public int getMaxLength()

      Returns the maximum length (in seconds) of this constraint.

      This method always returns the resolved value that the platform supports. If the platform doesn't support setting the max length of a video capture, then this will return 0. If it supports the value of #getPreferredMaxLength(), then this will return the same value. If it supports limiting the length of video capture, but it doesn't support the preferred max length value, then this will return the closest that the platform can provide to the preferred value.

      Note: This value will be equal to #getPreferredMaxLength() iff #isMaxLengthSupported() is true.

      Returns

      the maxLength The maximum length, in seconds, for the video capture. Zero for no limit.

      See also

      • #isMaxLengthSupported()

      • #preferredMaxLength(int)

      • #getPreferredMaxLength()

    • preferredMaxLength

      public VideoCaptureConstraints preferredMaxLength(int maxLength)

      Set the preferred max length for the video capture in seconds.

      If the platform supports this value, then #getMaxLength() will return this same value. If the platform does not support this value, then #getMaxLength() will return the closest value that the platform supports.

      Parameters
      • maxLength: the maxLength to set, in seconds. Set 0 for no limit.
      Returns

      Self for chaining

      See also

      • #getPreferredMaxLength()

      • #getMaxLength()

      • #isMaxLengthSupported()

    • getPreferredMaxLength

      public int getPreferredMaxLength()

      Gets the preferred max length video capture, in seconds.

      Returns

      The preferred max length, in seconds.

      See also

      • #preferredMaxLength(int)

      • #getMaxLength()

      • #isMaxLengthSupported()

    • isMaxLengthSupported

      public boolean isMaxLengthSupported()

      Checks to see if the preferred max length specified in this constraint is supported by the underlying platform.

      Returns

      True if and only if the preferred max length value is supported by the underlying platform.

      See also

      • #getMaxLength()

      • #preferredMaxLength(int)

      • #getPreferredMaxLength()

    • getWidth

      public int getWidth()

      Gets the width constraint that is supported by the platform, and is nearest to the specified preferred width. If the platform supports the preferred width constraint, then #getPreferredWidth() will be the same as #getWidth(). If the platform doesn't support any width constraints at all then this will return 0. If the platform supports some width constraints, but not the constraint specified, then this will return the most nearest value that the platform supports.

      Returns

      the Platform-supported width of this constraint.

      See also

      • #getPreferredWidth()

      • #isSizeSupported()

      • #preferredWidth(int)

    • getPreferredWidth

      public int getPreferredWidth()

      Gets the preferred width constraint.

      Returns

      The preferred width constraint.

      See also

      • #getWidth()

      • #preferredWidth(int)

      • #isSizeSupported()

    • getPreferredHeight

      public int getPreferredHeight()

      Gets the preferred height constraint.

      Returns

      The preferred height constraint.

      See also

      • #getHeight()

      • #preferredHeight(int)

      • #isSizeSupported() `

    • isSizeSupported

      public boolean isSizeSupported()

      Checks if the specified preferred width and height constraints are supported by the platform.

      Returns

      True if the platform supports the width and height constraints specified directly.

      See also

      • #getWidth()

      • #getHeight()

      • #getPreferredWidth()

      • #getPreferredHeight()

      • #preferredWidth(int)

      • #preferredHeight(int)

      • #isSupported()

    • preferredWidth

      public VideoCaptureConstraints preferredWidth(int width)

      Sets the preferred width constraint.

      Parameters
      • width: the width to set
      See also

      • #getWidth()

      • #getPreferredWidth()

      • #isSizeSupported()

    • getHeight

      public int getHeight()

      Gets the platform-supported height constraint. If the platform supports the preferred height constraint, then this will return the same value as #getPreferredHeight(). If the platform doesn't support any height constraints, then this will return 0. If the platform supports height constraints, but not the specific preferred height value, then this will return the nearest value that is supported by the platform.

      Returns

      the platform-supported height constraint.

      See also

      • #getPreferredHeight()

      • #preferredHeight(int)

      • #isSizeSupported()

    • preferredHeight

      public VideoCaptureConstraints preferredHeight(int height)

      Sets the preferred height constraint.

      Parameters
      • height: the height to set
      See also

      • #getPreferredHeight()

      • #getHeight()

      • #isSizeSupported()

    • getPreferredQuality

      public int getPreferredQuality()

      Gets the preferred quality of the recording.

      Returns

      May be one of #QUALITY_LOW, #QUALITY_HIGH, or 0.

      See also

      • #preferredQuality(int)

      • #isQualitySupported()

      • #getQuality()

    • getQuality

      public int getQuality()

      Gets the quality of the recording.

      Returns

      May be one of #QUALITY_LOW, #QUALITY_HIGH, or 0.

      See also

      • #getPreferredQuality()

      • #preferredQuality(int)

      • #isQualitySupported()

    • preferredQuality

      public VideoCaptureConstraints preferredQuality(int quality)

      Sets the preferred quality of the video recording.

      Parameters
      • quality: May be one of #QUALITY_LOW, #QUALITY_HIGH, or 0.
      Returns

      Self for chaining

      See also

      • #getQuality()

      • #getPreferredQuality()

      • #isQualitySupported()

    • isSupported

      public boolean isSupported()

      Checks if this constraint is fully supported by the platform.

      Returns

      True if the constrains described in this object are fully supported by the platform.

      See also

      • #isSizeSupported()

      • #isMaxLengthSupported()

    • isQualitySupported

      public boolean isQualitySupported()

      Checks if the preferred quality setting is supported.

      Returns

      True if the preferred quality is not set (i.e. 0), or is supported by the platform.

      See also

      • #getPreferredQuality()

      • #getQuality()

      • #preferredQuality(int)

    • isMaxFileSizeSupported

      public boolean isMaxFileSizeSupported()

      Checks if the max file size constraint is supported.

      Returns

      true if the max file size constraint is supported, or the max file size constraint isn't set.

      See also

      • #preferredMaxFileSize(long)

      • #getMaxFileSize()

      • #getPreferredMaxFileSize()

    • isNullConstraint

      public boolean isNullConstraint()

      Checks if this constraint is effectively a null constraint. I.e. it doesn't include any width, height, or max length constraints.

      Returns

      True if this constraints is effectively null.