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New API-Function burn_drive_set_buffer_waiting()

This commit is contained in:
Thomas Schmitt 2007-07-12 17:17:41 +00:00
parent 0217702b8c
commit 22d1d56ebd
3 changed files with 75 additions and 5 deletions
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2
cdrskin/cdrskin_timestamp.h
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@ -1 +1 @@
#define Cdrskin_timestamP "2007.07.12.162856"
#define Cdrskin_timestamP "2007.07.12.171727"

29
libburn/drive.c
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@ -857,6 +857,35 @@ void burn_drive_set_speed(struct burn_drive *d, int r, int w)
d->set_speed(d, r, w);
}
/* ts A70711 API function */
int burn_drive_set_buffer_waiting(struct burn_drive *d, int enable,
int min_usec, int max_usec, int timeout_sec,
int min_percent, int max_percent)
{
if (enable >= 0)
d->wait_for_buffer_free = !!enable;
if (min_usec >= 0)
d->wfb_min_usec = min_usec;
if (max_usec >= 0)
d->wfb_max_usec = max_usec;
if (timeout_sec >= 0)
d->wfb_timeout_sec = timeout_sec;
if (min_percent >= 0) {
if (min_percent < 25 || min_percent > 100)
return 0;
d->wfb_min_percent = min_percent;
}
if (max_percent >= 0) {
if (max_percent < 25 || max_percent > 100)
return 0;
d->wfb_max_percent = max_percent;
}
return 1;
}
int burn_msf_to_sectors(int m, int s, int f)
{
return (m * 60 + s) * 75 + f;

49
libburn/libburn.h
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@ -455,8 +455,9 @@ struct burn_progress {
/* ts A61119 */
/** The number of bytes sent to the drive buffer */
off_t buffered_bytes;
/** The minimum number of buffered bytes. (Caution: Before surely
one buffer size of bytes was processed, this value is 0xffffffff.)
/** The minimum number of bytes stored in buffer during write.
(Caution: Before surely one buffer size of bytes was processed,
this value is 0xffffffff.)
*/
unsigned buffer_min_fill;
};
@ -1288,12 +1289,52 @@ int burn_track_get_counters(struct burn_track *t,
/** Sets drive read and write speed
Note: "k" is 1000, not 1024. 1xCD = 176.4 k/s, 1xDVD = 1385 k/s.
Fractional speeds should be rounded up. Like 4xCD = 706.
@param d The drive to set speed for
@param read Read speed in k/s (0 is max)
@param write Write speed in k/s (0 is max)
@param read Read speed in k/s (0 is max).
@param write Write speed in k/s (0 is max).
*/
void burn_drive_set_speed(struct burn_drive *d, int read, int write);
/* ts A70711 */
/** Controls the behavior with writing when the drive buffer is suspected to
be full. To check and wait for enough free buffer space before writing
will move the task of waiting from the operating system's device driver
to libburn. While writing is going on and waiting is enabled, any write
operation will be checked wether it will fill the drive buffer up to
more than max_percent. If so, then waiting will happen until the buffer
fill is predicted with at most min_percent.
Thus: if min_percent < max_percent then transfer rate will oscillate.
This may allow the driver to operate on other devices, e.g. a disk from
which to read the input for writing. On the other hand, this checking might
reduce maximum throughput to the drive or even get misled by faulty buffer
fill replies from the drive. It is advised not to set speed to 0 (= max)
together with enabling buffer waiting.
If a setting parameters is < 0, then this setting will stay unchanged
by the call.
Known burner or media specific pitfalls:
To have max_percent larger than the burner's best reported buffer fill has
the same effect as min_percent==max_percent. Some burners do not report
their full buffer with all media types. Some are not suitable because
they report their buffer fill with delay.
@param d The drive to control
@param enable 0= disable , 1= enable waiting , (-1 = do not change setting)
@param min_usec Shortest possible sleeping period (given in micro seconds)
@param max_usec Longest possible sleeping period (given in micro seconds)
@param timeout_sec If a single write has to wait longer than this number
of seconds, then waiting gets disabled and mindless
writing starts. A value of 0 disables this timeout.
@param min_percent Minimum of desired buffer oscillation: 25 to 100
@param max_percent Maximum of desired buffer oscillation: 25 to 100
@return 1=success , 0=failure
*/
int burn_drive_set_buffer_waiting(struct burn_drive *d, int enable,
int min_usec, int max_usec, int timeout_sec,
int min_percent, int max_percent);
/* these are for my debugging, they will disappear */
void burn_structure_print_disc(struct burn_disc *d);
void burn_structure_print_session(struct burn_session *s);