h->param.rc.b_stat_read 参数的含义

转自H264乐园

请教x264里面h->param.rc.b_stat_read 参数的含义

本帖最后由 xinyancode 于 2010-3-31 09:53 AM 编辑

请问x264里面：

h->param.rc.b_stat_read 参数是什么含义？

这是对它的赋初值：

h->param.rc.b_stat_read = 0;

在x264程序里面有很多地方都用这个参数作为判断条件，如：

if( h->param.rc.b_stat_read )

{

。。。。

}    

定义的时候是这样的： 

int    b_stat_read;     //Read stat from psz_stat_in and use it

psz_stat 紧跟着定义的：

char   *psz_stat_in;    

但是整个程序里面好像都是0，我没看明白它后面的那句注释

//Read stat from psz_stat_in and use it，这是什么意思？

谁能帮我指点一下?

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Fastreaming

中级会员

2#

 发表于 2010-3-31 11:56 AM | 只看该作者

>> h->param.rc.b_stat_read 参数是什么含义

Indicate the PASS status

>>//Read stat from psz_stat_in and use it，这是什么意思？

in pass 1 mode, x264 will generate the stats information and write them into psz_stat_out

in pass 2 mode, x264 will read the stats information from (psz_stat_in) pass 1, or pass 3 for best ratecontrol decision

in pass 3 mode, x264 will read the stats information from pass 1 (psz_stat_in, psz_stat_out) for better ratecontrol decision, x264 also write the newer stats information into psz_stat_out

First Pass:

rc.b_stat_read == 0, rc.b_stat_write = 1

Third Paas:

rc.b_stat_read = 1, rc.b_stat_write = 1

Second Pass:

rc.b_stat_read = 1, rc.b_stat_write = 0