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MediaMetadataRetriever Class in Android with Examples

  • Difficulty Level : Hard
  • Last Updated : 18 Feb, 2021

anMediaMetadataRetriever class provides a unified interface for retrieving frames and metadata from an input media file. It is located under android.media package. For example: retrieving song name, artist name, width or height of the video, video format/mime-type, duration of media, media modified date, etc. Constants/Keys provided by MediaMetadataRetriever class are plentiful. These constants are used to retrieve media information. Although, the work done by many of the Constants is obvious from their name, here is a small description of each constant present in MediaMetadataRetriever class.

Important Constants of MediaMetadataRetriever Class

Constant Type

Constant Name

Description

int   METADATA_KEY_ALBUMThe metadata key to retrieve the information about the album title of the data source.
int METADATA_KEY_ALBUMARTISTThe metadata key to retrieve the information about the performers or artist associated with the data source.
intMETADATA_KEY_ARTISTThe metadata key to retrieve the information about the artist of the data source.
intMETADATA_KEY_AUTHORThe metadata key to retrieve the information about the author of the data source.
intMETADATA_KEY_CD_TRACK_NUMBERThe metadata key to retrieve the numeric string describing the order of the audio data source on its original recording.
intMETADATA_KEY_COMPILATION  The metadata key to retrieve the music album compilation status.
intMETADATA_KEY_COMPOSER  The metadata key to retrieve the information about the composer of the data source.
intMETADATA_KEY_DATE  The metadata key to retrieve the date when the data source was created or modified.
intMETADATA_KEY_DISC_NUMBER  The metadata key to retrieve the numeric string that describes which part of a set the audio data source comes from.
intMETADATA_KEY_DURATION                      The metadata key to retrieve the playback duration of the data source.

Constant Type



Constant Name

Description

int METADATA_KEY_GENRE  The metadata key to retrieve the content type or genre of the data source.
intMETADATA_KEY_MIMETYPE  The metadata key to retrieve the mime type of the data source.
intMETADATA_KEY_NUM_TRACKS  The metadata key to retrieve the number of tracks, such as audio, video, text, in the data source, such as a mp4 or 3gpp file.
intMETADATA_KEY_TITLE  The metadata key to retrieve the data source title.
intMETADATA_KEY_WRITER  The metadata key to retrieve the information of the writer (such as lyricist) of the data source.
intMETADATA_KEY_YEAR  The metadata key to retrieve the year when the data source was created or modified.
intOPTION_CLOSEST  This option is used with getFrameAtTime(long, int) to retrieve a frame (not necessarily a keyframe) associated with a data source that is located closest to or at the given time.
intOPTION_CLOSEST_SYNC  This option is used with getFrameAtTime(long, int) to retrieve a sync (or key) frame associated with a data source that is located closest to (in time) or at the given time.
intOPTION_NEXT_SYNC  This option is used with getFrameAtTime(long, int) to retrieve a sync (or key) frame associated with a data source that is located right after or at the given time.
intOPTION_PREVIOUS_SYNC  This option is used with getFrameAtTime(long, int) to retrieve a sync (or key) frame associated with a data source that is located right before or at the given time.

Methods Available in MediaMetadataRetriever Class

Method Type

Methods

String

extractMetadata(int keyCode)

Call this method after setDataSource().

byte[]

getEmbeddedPicture()

Call this method after setDataSource().



Bitmap

getFrameAtTime(long timeUs, int option)

Call this method after setDataSource().

Bitmap

getFrameAtTime(long timeUs)

Call this method after setDataSource().

Bitmap

getFrameAtTime()

Call this method after setDataSource().

void

release()

Call it when one is done with the object.

This method releases the memory allocated internally.

void

setDataSource(FileDescriptor fd, long offset, long length)

Sets the data source (FileDescriptor) to use.

void

setDataSource(String path)

Sets the data source (file pathname) to use.

void

setDataSource(FileDescriptor fd)

Sets the data source (FileDescriptor) to use.

void

setDataSource(Context context, Uri uri)

Sets the data source as a content Uri.

void    

Close()

Closes this resource, relinquishing any underlying resources. 

This method is invoked automatically on objects managed by 



the try-with-resources statement.

Examples

1. Get mp3 duration

Here is the sample code snippet in Java to get the mp3 duration. 

Java




// load data file
// filePath is of type String which holds the path of file
MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
metaRetriever.setDataSource(filePath);
  
// get mp3 info
String duration = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
long dur = Long.parseLong(duration);
  
// convert duration to minute:seconds
String seconds = String.valueOf((dur % 60000) / 1000);
String minutes = String.valueOf(dur / 60000);
String out = minutes + ":" + seconds;
if (seconds.length() == 1) {
    txtTime.setText("0" + minutes + ":0" + seconds);
}
else {
    txtTime.setText("0" + minutes + ":" + seconds);
}
  
// close object
metaRetriever.release();

2. Detect the orientation of the video

Below is a sample video

Here is the sample code snippet in Java to detect the orientation of the video

Java




MediaMetadataRetriever m = new MediaMetadataRetriever();
  
// load data file
m.setDataSource(path);
  
// getting the bitmap of a frame from video
Bitmap thumbnail = m.getFrameAtTime();
  
if (Build.VERSION.SDK_INT >= 17) {
    String s = m.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
}
  
// Another way of determining whether the video is Landscape or portrait
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(inputPath);
video_width = Integer.valueOf(retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH));
video_height = Integer.valueOf(retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT));
  
// close object
retriever.release();
  
// If the width is bigger than the height then it means that
// the video was taken in landscape mode and vice versa.
if ((video_width > video_height)) {
    // landscape
}
else {
    // portrait
}

3. Setting up the Album cover and Album title in a Music App

Below is a sample image



Here is the sample code snippet in Java to setting up the Album cover and Album title in a Music App.

Java




MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(filePath);
  
// getting the embedded picture from media
byte[] art = retriever.getEmbeddedPicture();
  
if (art != null) {
    // Convert the byte array to a bitmap
    imgAlbum.setImageBitmap(BitmapFactory.decodeByteArray(art, 0, art.length));
}
else {
    imgAlbum.setImageResource(R.drawable.no_image);
}
// close object
retriever.release();

4. Making a CropVideo Activity like TikTok

Below is a sample video

Here is the sample code snippet in Java to make a CropVideo Activity like TikTok.

Java




try {
    MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
    mediaMetadataRetriever.setDataSource(context, videoUri);
  
    // Retrieve media data use microsecond
    long interval = (endPosition - startPosition) / (totalThumbsCount - 1);
    for (long i = 0; i < totalThumbsCount; ++i) {
        long frameTime = startPosition + interval * i;
        Bitmap bitmap = mediaMetadataRetriever.getFrameAtTime(frameTime * 1000, MediaMetadataRetriever.OPTION_CLOSEST_SYNC);
        if (bitmap == null)
            continue;
        try {
            bitmap = Bitmap.createScaledBitmap(bitmap, THUMB_WIDTH, THUMB_HEIGHT, false);
        }
        catch (final Throwable t) {
            t.printStackTrace();
        }
        // add bitmaps to the recyclerview here…
    }
    mediaMetadataRetriever.release();
}
catch (final Throwable e) {
    Thread.getDefaultUncaughtExceptionHandler().uncaughtException(Thread.currentThread(), e);
}

Note:

  1. Always check for illegal filePath.
  2. Handle the null bitmap condition. There may be cases when the media doesn’t return a valid bitmap.
  3. The frame index must be that of a valid frame. The total number of frames available for retrieval can be queried via the METADATA_KEY_VIDEO_FRAME_COUNT key.
  4. When retrieving the frame at the given time position, there is no guarantee that the data source has a frame located at the position. When this happens, a frame nearby will be returned. If time is negative, time position and option will be ignored, and any frame that the implementation considers as representative may be returned.
  5. setDataSource(), Call this method before the rest of the methods in this class. This method may be time-consuming.

Reference link: https://developer.android.com/reference/android/media/MediaMetadataRetriever

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