import javazoom.jl.decoder.DecoderException; //导入依赖的package包/类
@Override
public int read() throws IOException {
	if (atEnd())
		return -1;
	while (bpos / 2 >= bufLen) {
		try {
			header = bitstream.readFrame();
			if (header == null) {
				buf.clear_buffer();

				endOfStream = true;
				return -1;
			}
			buf.clear_buffer();
			decoder.decodeFrame(header, bitstream);
			bufLen = buf.getBufferLength();
			bitstream.closeFrame();
		} catch (DecoderException | BitstreamException e) {
			Log.error(e);
		}
		bpos = 0;
	}
	int npos = bpos / 2;
	bpos++;

	if (bpos % 2 == 0)
		return (buf.getBuffer()[npos] >> 8) & 0xff;
	else
		return (buf.getBuffer()[npos]) & 0xff;
}
 

import javazoom.jl.decoder.DecoderException; //导入依赖的package包/类
@Override
	public long skip(long length) {
		if (bufLen <= 0)
			Log.warn("Mp3InputStream: skip: bufLen not yet determined.");

		int skipped = 0;
		while (skipped + bufLen * 2 < length) {
			try {
				header = bitstream.readFrame();
				if (header == null) {
//					Log.warn("Mp3InputStream: skip: header is null.");
					endOfStream = true;
					return -1;
				}

				// last frame that won't be skipped so better read it
				if (skipped + bufLen * 2 * 4 >= length || bufLen <= 0) {
					buf.clear_buffer();
					decoder.decodeFrame(header, bitstream);
					bufLen = buf.getBufferLength();
				}
				skipped += bufLen * 2 - bpos;

				bitstream.closeFrame();
				bpos = 0;
			} catch (BitstreamException | DecoderException e) {
				Log.error(e);
			}
		}
		if (bufLen * 2 - bpos > length - skipped) {
			bpos += length - skipped;
			skipped += length - skipped;
		}

		return skipped;
	}