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New -read_speed prefixes "soft_force:" and "soft_corr:"

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Thomas Schmitt
2020-08-26 16:29:40 +02:00
parent f23b23fd17
commit ffb7fe64c9
10 changed files with 283 additions and 119 deletions
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31
xorriso/xorriso.1
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@ -9,7 +9,7 @@
.\" First parameter, NAME, should be all caps
.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
.\" other parameters are allowed: see man(7), man(1)
.TH XORRISO 1 "Version 1.5.3, Aug 06, 2020"
.TH XORRISO 1 "Version 1.5.3, Aug 26, 2020"
.\" Please adjust this date whenever revising the manpage.
.\"
.\" Some roff macros, for reference:
@ -819,9 +819,32 @@ or high. Therefore "min" cannot become higher than 1x speed of the involved
medium type. Read speed "max" cannot become lower than 52xCD, 24xDVD,
or 20xBD, depending on the medium type.
.br
MMC drives usually activate their own idea of speed and take
the speed value given by the burn program only as hint
for their own decision.
MMC drives usually activate their own idea of speed and take the speed value
given by the burn program only as hint for their own decision. Friendly drives
adjust their constant angular velocity so that the desired speed is reached
at the outer rim of the medium. But often there is only the choice between
very slow and very loud.
.br
Sometimes no speed setting is obeyed at all, but speed is adjusted to the
demand frequency of the reading program. So xorriso offers to set an additional
software enforced limit by prefix "soft_force:". The program will take care
not to read faster than the soft_force speed.
This may be combined with setting the drive speed to a higher value.
Setting "soft_force:0" disables this feature.
.br
"soft_force:" tries to correct in subsequent waiting periods lost or surplus
time of up to 0.25 seconds. This smoothens the overall data stream but also
enables short times of higher speed to compensate short times of low speed.
Prefix "soft_corr:" sets this hindsight span by giving a number of
microseconds. Not more than 1 billion = 1000 seconds.
Very short times can cause speed deviations, because systematic inaccuracies of
the waiting function cannot be compensated.
.br
Examples (combinable):
.br
\-read_speed 6xBD
.br
\-read_speed soft_force:4xBD \-read_speed soft_corr:100000
.TP
\fB\-load\fR entity id
Load a particular (possibly outdated) ISO session from \-dev or \-indev.