Calculate the correct payload_size which pure padding data, in the process of rtc2rtmp, make Chrome happy (#2461)
Calculate the correct payload_size which pure padding data, in the process of rtc2rtmp, make Chrome happy (#2461)

* Calculate the correct payload_size which pure padding data, in the process of rtc2rtmp, make Chrome happy

* make clear for magic number

make clear for magic number

* Update srs_app_rtc_source.cpp
winlinvip/srs,ossrs/srs,winlinvip/srs,ossrs/srs,ossrs/srs,winlinvip/srs,ossrs/srs,ossrs/srs,ossrs/srs,winlinvip/srs,winlinvip/srs,winlinvip/srs