package cn.org.hentai.jtt1078.flv;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Flv 音频封装编码
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* author:zhouyili (11861744@qq.com)
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*/
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public class FlvAudioTagEncoder {
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public static final Logger log = LoggerFactory.getLogger(FlvAudioTagEncoder.class);
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public ByteBuf encode(AudioTag audioTag) throws Exception {
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ByteBuf buffer = Unpooled.buffer();
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if (audioTag == null) return buffer;
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// buffer.writeInt(audioTag.getPreTagSize());
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//----------------------tag header begin-------
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buffer.writeByte(8);
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buffer.writeMedium(audioTag.getTagDataSize());
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buffer.writeMedium(audioTag.getOffSetTimestamp() & 0xFFFFFF);
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buffer.writeByte(audioTag.getOffSetTimestamp() >> 24);
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buffer.writeMedium(audioTag.getStreamId());
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//---------------------tag header length 11---------
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//---------------------tag header end----------------
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byte formatAndRateAndSize = (byte) (audioTag.getFormat() << 4 | audioTag.getRate() << 2 | audioTag.getSize() << 1 | audioTag.getType());
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//-------------data begin-------
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buffer.writeByte(formatAndRateAndSize);
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buffer.writeBytes(audioTag.getData());
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//-------------data end -------
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buffer.writeInt(buffer.writerIndex());//应该等于11+tagDataSize
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return buffer;
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}
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}
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