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我需要在量化之后访问 DCT 系数表(jpeg_write_scanlines?),但在霍夫曼熵编码之前以及将文件写入磁盘之前。libjpeg有可能吗?我知道作为一种解决方法,我可以将压缩文件写入磁盘并使用缓冲图像模式(jpeg_read_coefficients)将其读回,但我想避免走弯路。