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G.726 codec bug #27

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bulletnoid opened this issue May 25, 2022 · 2 comments

bulletnoid commented May 25, 2022 •

edited

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g726 解码有爆音, 对比解码 pcm 文件与 ffmpeg 转码的结果不同
实测发现 g726 state 有错误

其中

jtt1078-video-server/src/main/java/cn/org/hentai/jtt1078/codec/g726/G726.java

Lines 242 to 246 in 6ec4b5e

    
           if (dqsez != 0) 
        
           	if (pks1==0) 
        
           		state.a[0]+=192; 
        
           	else 
        
           		state.a[0] -= 192;

应为

if (dqsez != 0) {
    if (pks1 == 0)
        state.a[0] += 192;
    else
        state.a[0] -= 192;
}

Author

bulletnoid commented May 26, 2022

另外 g726 编码只有大端序, 设备基本是小端序的, 需要一个 bit stream 来处理小端序 IO
可以参考 https://github.com/herbix/bitstream

Owner

glaciall commented May 28, 2022

我怎么看你发的那两段代码是一模一样的呢？

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