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8168的osd能用ttf字体库吗?怎么用?

用demo做好了osd,可以正常显示logo、时间、通道,但是这些是windows下产生的图片做的,是静态的,如果要想用ttf字体库来实现任意字符,怎么做?是按照文档说的,bmp--->jpg--->yuv--->y、uv--->text吗?可是感觉不合理啊,

能用SDL和ttf实现任意字符的osd吗?可是和Demo_text_draw()这个函数的接口不符,需要y、uv分量的地址

有啥思路可供参考?不可能不能用ttf字体库吧