Hmmm need to find the line count value.
The Maximum Exposure Times is Calculated (Frame Length * 1000000000 / pixel Clock) * Maximum Line Count .
The Maximum Line Count value is what they limit when searching for this value its supposed to be after the maximum analog iso value . I tested this on the nexus 6p LG G4 and one plus 2.
So in Nexus 5 Case it's 3440 x 1000000000 / 260000000 resulting in 13230.76923076923 this number is rounded up to 13231 giving the minimum exposure time
Given we know the Max Exposure time is 866975130 we div it with 13231 it gives us 65526.04716196811 so round down the value to just 65526 so the value range we looking for is between 65525 and 65535 its a 32 bit int hex value .
The two libs I had modified where values just after max analog gain and before . Attached 200mhz zip with pixel clock clocked down from 260 MHz to 200mhz to make sure there are no decimals to see what value.
You can run dumpsys media.camera > /sdcard/dump.text after typing su command in terminal to see if max exposure changed as well as min
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