从网上搜的一些方法看不懂：
image_buffer = tmp = (unsigned char *)map + m_buf.offsets[frame]; image_buffer = tmp = (unsigned
image_buffer = tmp = (unsigned char *)map + m_buf.offsets[frame]; image_buffer = tmp = (unsigned
阅读背景：
RGB和BGR格式之间怎么转换？
来源：互联网
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