Android 获取播放视频的相关 内容,  分辨率, 方向,作者信息

MediaMetadataRetriever retr = new MediaMetadataRetriever();
retr.setDataSource(videoPath);
String height = retr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT); // 视频高度
String width = retr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH); // 视频宽度
String rotation = retr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION); // 视频旋转方向

还有 很多的信息 可以获取
需要注意的时, 获取到的 都是String 类型 需要自己转换成 相应类型 建议转换成 float
应为 即使是整数,转成float 也没有问题 但是小数string 转 int 就有问题而来

/**
* The metadata key to retrieve the numeric string describing the
* order of the audio data source on its original recording.
*/
public static final int METADATA_KEY_CD_TRACK_NUMBER = 0;
/**
* The metadata key to retrieve the information about the album title
* of the data source.
*/
public static final int METADATA_KEY_ALBUM           = 1;
/**
* The metadata key to retrieve the information about the artist of
* the data source.
*/
public static final int METADATA_KEY_ARTIST          = 2;
/**
* The metadata key to retrieve the information about the author of
* the data source.
*/
public static final int METADATA_KEY_AUTHOR          = 3;
/**
* The metadata key to retrieve the information about the composer of
* the data source.
*/
public static final int METADATA_KEY_COMPOSER        = 4;
/**
* The metadata key to retrieve the date when the data source was created
* or modified.
*/
public static final int METADATA_KEY_DATE            = 5;
/**
* The metadata key to retrieve the content type or genre of the data
* source.
*/
public static final int METADATA_KEY_GENRE           = 6;
/**
* The metadata key to retrieve the data source title.
*/
public static final int METADATA_KEY_TITLE           = 7;
/**
* The metadata key to retrieve the year when the data source was created
* or modified.
*/
public static final int METADATA_KEY_YEAR            = 8;
/**
* The metadata key to retrieve the playback duration of the data source.
*/
public static final int METADATA_KEY_DURATION        = 9;
/**
* 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.
*/
public static final int METADATA_KEY_NUM_TRACKS      = 10;
/**
* The metadata key to retrieve the information of the writer (such as
* lyricist) of the data source.
*/
public static final int METADATA_KEY_WRITER          = 11;
/**
* The metadata key to retrieve the mime type of the data source. Some
* example mime types include: "video/mp4", "audio/mp4", "audio/amr-wb",
* etc.
*/
public static final int METADATA_KEY_MIMETYPE        = 12;
/**
* The metadata key to retrieve the information about the performers or
* artist associated with the data source.
*/
public static final int METADATA_KEY_ALBUMARTIST     = 13;
/**
* The metadata key to retrieve the numberic string that describes which
* part of a set the audio data source comes from.
*/
public static final int METADATA_KEY_DISC_NUMBER     = 14;
/**
* The metadata key to retrieve the music album compilation status.
*/
public static final int METADATA_KEY_COMPILATION     = 15;
/**
* If this key exists the media contains audio content.
*/
public static final int METADATA_KEY_HAS_AUDIO       = 16;
/**
* If this key exists the media contains video content.
*/
public static final int METADATA_KEY_HAS_VIDEO       = 17;
/**
* If the media contains video, this key retrieves its width.
*/
public static final int METADATA_KEY_VIDEO_WIDTH     = 18;
/**
* If the media contains video, this key retrieves its height.
*/
public static final int METADATA_KEY_VIDEO_HEIGHT    = 19;
/**
* This key retrieves the average bitrate (in bits/sec), if available.
*/
public static final int METADATA_KEY_BITRATE         = 20;
/**
* This key retrieves the language code of text tracks, if available.
* If multiple text tracks present, the return value will look like:
* "eng:chi"
* @hide
*/
public static final int METADATA_KEY_TIMED_TEXT_LANGUAGES      = 21;
/**
* If this key exists the media is drm-protected.
* @hide
*/
public static final int METADATA_KEY_IS_DRM          = 22;
/**
* This key retrieves the location information, if available.
* The location should be specified according to ISO-6709 standard, under
* a mp4/3gp box "@xyz". Location with longitude of -90 degrees and latitude
* of 180 degrees will be retrieved as "-90.0000+180.0000", for instance.
*/
public static final int METADATA_KEY_LOCATION        = 23;
/**
* This key retrieves the video rotation angle in degrees, if available.
* The video rotation angle may be 0, 90, 180, or 270 degrees.
*/
public static final int METADATA_KEY_VIDEO_ROTATION = 24;
/**
* This key retrieves the original capture framerate, if it's
* available. The capture framerate will be a floating point
* number.
*/
public static final int METADATA_KEY_CAPTURE_FRAMERATE = 25;