Video

Recording and playback of video files utilizes the MediaPlayer/MediaRecorder framework in a similar way to the audio examples discussed previously. For completeness, the steps are included here. First, if video is recorded, set the permission in the AndroidMani-fest XML file:

<uses-permission android:name="android.permission.RECORD_VIDEO" />

Then, the specification has different choices from the audio examples (note, default can also be used and is the same as the first choice in these lists):

■ MediaRecorder.VideoSource:

■ MediaRecorder.OutputFormat:

■ three_GPP—3GPP media file format

■ MediaRecorder.VideoEncoder:

■ MPEG_4_SP-MPEG4 Simple Profile

The steps to record video are

1. Create an instance of the MediaRecorder: MediaRecorder m_Recorder = new MediaRecorder();

2. Specify the source of media, which currently is only the camera: m_Recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

3. Set the output file format and encoding: m_Recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); m_Recorder.setAudioEncoder(MediaRecorder.AudioEncoder.H263);

4. Set the path for the file to be saved: m_Recorder.setOutputFile(path);

5. Prepare and start the recording: m_Recorder.prepare(); m_Recorder.start();

For playback, the steps are

1. Create an instance of the MediaPlayer: MediaPlayer m_mediaPlayer = new MediaPlayer();

2. Specify the source of media. It can be created from a raw resource: m_mediaPlayer = MediaPlayer.create(this, R.raw.my_video);

Another option is to set as a file from the filesystem (which then also needs a prepare statement):

m_mediaPlayer.setDataSource(path); m_mediaPlayer.prepare();

In any case, these statements need to be surrounded by a try-catch block because the specified resource might not exist.

3. Start playback of the video: m_mediaPlayer.start();

4. When the playback is done, stop the MediaPlayer instance and release it to free up resources:

m_mediaPlayer.stop(); m_mediaPlayer.release();

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