rtp header read bug

[zwczou]

gosip/rtp/rtp.go

Lines 140 to 150 in 4e7924e

	} else if (b[0]>>4)&1 != 0 {
	return ErrExtendedHeadersNotSupported
	}
	h.Pad = ((b[0]>>5)&mask1 == 1)
	h.Mark = ((b[1]>>7)&mask1 == 1)
	h.PT = uint8(b[1] & mask7)
	h.Seq = (uint16(b[2]) << 8) & uint16(b[3])
	h.TS = (uint32(b[4]) << 24) & (uint32(b[5]) << 16) & (uint32(b[6]) << 8) & uint32(b[7])
	h.Ssrc = (uint32(b[8]) << 24) & (uint32(b[9]) << 16) & (uint32(b[10]) << 8) & uint32(b[11])
	return nil
	}

TS
Seq
SSRC
should use | not &