jBass/src/AndroidRelated/AudioFileInformationV2.java

package AndroidRelated;

import java.io.IOException;

import com.sun.jna.Memory;
import com.sun.jna.Pointer;
import com.un4seen.bass.BASS;
import com.un4seen.bass.BASS.bassconstant;

import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.objects.streams.File;

@BA.ShortName("AudioFileInformationV2")
public class AudioFileInformationV2 {
	private final String filename;
	private int handle=0;
	private int size=-1;
	private double seconds=-1;
	private boolean found = false;
	private boolean valid=false;
	private final int _samplingrate;
	private final int _initflag = bassconstant.BASS_DEVICE_16BITS | bassconstant.BASS_DEVICE_MONO;
	private final int _loadflag = bassconstant.BASS_STREAM_DECODE | bassconstant.BASS_SAMPLE_MONO;
	private final int KB_threshold = 1024;
	private final int MB_threshold = 1024 * 1024;
	private final int GB_threshold = 1024 * 1024 * 1024;
	private final int minute_threshold = 60;
	private final int hour_threshold = 60 * 60;
	private BASS bass;
	
	
	public AudioFileInformationV2() {
		filename ="";
		_samplingrate=44100;
	}
	
	public AudioFileInformationV2(BASS _bass,String path, int samplingrate) {
		bass = _bass;
		filename = path;
		this._samplingrate = samplingrate;
		
		try {
			found = File.Exists("", path);
		} catch (IOException e) {
			BA.Log("Unable to check existanceo of "+path+", Msg : "+e.getMessage());
			return;
		}
		
		
		if (bass instanceof BASS) {
			if (bass.BASS_GetVersion()!=0) {
				bass.BASS_Init(0, _samplingrate, _initflag);
				handle = bass.BASS_StreamCreateFile(false, filename, 0, 0, _loadflag);
				if (handle!=0) {
					size = (int)bass.BASS_ChannelGetLength(handle, bassconstant.BASS_POS_BYTE);
					if (size>-1) {
						seconds = bass.BASS_ChannelBytes2Seconds(handle, size);
						if (seconds>-1) {
							valid = true;
						}
					}
				bass.BASS_StreamFree(handle);						
				}
			}
		}
	}
	
	/***
	 * Check if file is found
	 * @return true if found
	 */
	public boolean isfound() {
		return found;
	}
	
	/**
	 * Check if file is valid
	 * @return true if valid
	 */
	public boolean isvalid() {
		return valid;
	}
	
	/**
	 * Size in bytes
	 * @return value in bytes
	 */
	public int size_in_bytes() {
		return size;
	}
	
	/**
	 * Return size in String
	 * if invalid, return N/A
	 * if < Kilobytes, return [X] B
	 * if < Megabytes, return [X] KB
	 * if < Gigabytes, return [X] MB
	 * else return [X] GB
	 * @return value in string
	 */
	public String size_in_String() {
		if (size<0) {
			return "N/A";
		} else if (size<KB_threshold) {
			return String.format("%d B", size);
		} else if (size < MB_threshold) {
			return String.format("%.1f KB" , (float)size / KB_threshold);
		} else if (size < GB_threshold) {
			return String.format("%.1f MB" , (float)size / MB_threshold);
		} else {
			return String.format("%.1f GB" , (float)size / GB_threshold);
		}
	}
	
	/**
	 * Return length in seconds
	 * if invalid, return less than 0
	 * @return value in seconds
	 */
	public double length_in_seconds() {
		return seconds;
	}
	
	/**
	 * Return length in string
	 * if invalid, return N/A
	 * if < 60 second, return [X] 
	 * if < 3600 seconds, return [X] M [Y] S
	 * else return [X] H [Y] M [Z] S  
	 * @return String
	 */
	public String length_in_String() {
		if (seconds<0) {
			return "N/A";
		} else if (seconds < minute_threshold) {
			return String.format("%d", seconds);
		} else if (seconds < hour_threshold) {
			int _minute = (int)(seconds / minute_threshold);
			int _second = (int)(seconds % minute_threshold);
			return String.format("%d M %d S", _minute, _second);
		} else {
			int _hour = (int) (seconds / hour_threshold);
			int remainder = (int)(seconds - (_hour * hour_threshold));
			int _minute = (int) (remainder / minute_threshold);
			int _second = (int)(remainder % minute_threshold);
			return String.format("%d H %d M %d S", _hour, _minute, _second);
		}
	}
	
	/**
	 * Return array of bytes for PCM data
	 * @return null if invalid
	 */
	public byte[] GetBytes() {
		if (valid) {
			if (size>0) {
				handle = bass.BASS_StreamCreateFile(false, filename, 0, 0, _loadflag);
				if (handle!=0) {
					Pointer pp = new Memory(size);
					int readsize = bass.BASS_ChannelGetData(handle, pp, size);
					if (readsize>0) {
						return pp.getByteArray(0, readsize);
					}
				}
			}
		} 
		
		return null;
	}
}