Rendering Multimedia Content - Beginning Java ME Platform - page 444

Event Purpose

PlayerListener.DEVICE_UNAVAILABLE The system has seized an exclusive device previously

used by the Player instance.

PlayerListener.DURATION_UPDATED The duration of the media rendered by the Player

instance has been updated.

PlayerListener.ERROR

An error occurred processing the media.

PlayerListener.RECORD_ERROR An error occurred recording the media.

PlayerListener.RECORD_STARTED Recording has started.

PlayerListener.RECORD_STOPPED Recording has stopped.

PlayerListener.SIZE_CHANGED

The size of the video being rendered has changed.

PlayerListener.STARTED The Player instance has entered the started state.

PlayerListener.STOPPED The Player instance has stopped rendering media in

response to a stop invocation.

PlayerListener.STOPPED_AT_TIME The Player instance has stopped rendering media as a

result of a StopTimeControl .

PlayerListener.VOLUME_CHANGED The volume of an audio device has changed.

Capturing Media

The ability of a growing number of Java ME devices to capture audio and video is excit-
ing, because it enables new kinds of applications, such as those that perform music
recognition, as well as different social interactions over the network. The MMAPI makes it
almost too easy to capture pictures from a built-in image sensor; you only need to open a
Player to a device's video sensor and invoke a VideoControl 's getSnapshot method. Listing 16-7
shows some pseudocode for this.

Listing 16-7. Capturing a Snapshot from an Imaging Sensor

Player player;
VideoControl vc;
Form viewer;

private void startCamera() {
try {
player = Manager.createPlayer("capture://video");
vc = (VideoControl) player.getControl("VideoControl");
player.realize();
player.prefetch();