SDK에 포함되어 있는 ThumbnailUtils 의 createVideoThumbnail 소스입니다.
제가 미디어쪽은 문외한이라 잘 모르겠는데
metadata 와 헤더정보가 같은 거라면 헤더정보를 이용하는게 맞네요
/**
* Create a video thumbnail for a video. May return null if the video is
* corrupt or the format is not supported.
*
* @param filePath the path of video file
* @param kind could be MINI_KIND or MICRO_KIND
*/
public static Bitmap createVideoThumbnail(String filePath, int kind) {
Bitmap bitmap = null;
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
try {
retriever.setDataSource(filePath);
bitmap = retriever.getFrameAtTime(-1);
} catch (IllegalArgumentException ex) {
// Assume this is a corrupt video file
} catch (RuntimeException ex) {
// Assume this is a corrupt video file.
} finally {
try {
retriever.release();
} catch (RuntimeException ex) {
// Ignore failures while cleaning up.
}
}
if (bitmap == null) return null;
if (kind == Images.Thumbnails.MINI_KIND) {
// Scale down the bitmap if it's too large.
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int max = Math.max(width, height);
if (max > 512) {
float scale = 512f / max;
int w = Math.round(scale * width);
int h = Math.round(scale * height);
bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
}
} else if (kind == Images.Thumbnails.MICRO_KIND) {
bitmap = extractThumbnail(bitmap,
TARGET_SIZE_MICRO_THUMBNAIL,
TARGET_SIZE_MICRO_THUMBNAIL,
OPTIONS_RECYCLE_INPUT);
}
return bitmap;
}
