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Added time skew on queue.

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The timer speed can be controlled via skew value, smaller = slower
centered on the skew-base value.
This commit is contained in:
Takashi Iwai 2001-12-10 16:45:05 +00:00
parent e457d1f0c0
commit bcf50519e4
4 changed files with 87 additions and 17 deletions
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46
src/seq/seq.c
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@ -2260,6 +2260,28 @@ int snd_seq_queue_tempo_get_ppq(const snd_seq_queue_tempo_t *info)
return info->ppq;
}
/**
* \brief Get the timer skew value of a queue_status container
* \param info queue_status container
* \return timer skew value
*/
unsigned int snd_seq_queue_tempo_get_skew(const snd_seq_queue_tempo_t *info)
{
assert(info);
return info->skew_value;
}
/**
* \brief Get the timer skew base value of a queue_status container
* \param info queue_status container
* \return timer skew base value
*/
unsigned int snd_seq_queue_tempo_get_skew_base(const snd_seq_queue_tempo_t *info)
{
assert(info);
return info->skew_base;
}
/**
* \brief Set the tempo of a queue_status container
* \param info queue_status container
@ -2282,6 +2304,30 @@ void snd_seq_queue_tempo_set_ppq(snd_seq_queue_tempo_t *info, int ppq)
info->ppq = ppq;
}
/**
* \brief Set the timer skew value of a queue_status container
* \param info queue_status container
* \param skew timer skew value
*
* The skew of timer is calculated as skew / base.
* For example, to play with double speed, pass base * 2 as the skew value.
*/
void snd_seq_queue_tempo_set_skew(snd_seq_queue_tempo_t *info, unsigned int skew)
{
assert(info);
info->skew_value = skew;
}
/**
* \brief Set the timer skew base value of a queue_status container
* \param info queue_status container
* \param base timer skew base value
*/
void snd_seq_queue_tempo_set_skew_base(snd_seq_queue_tempo_t *info, unsigned int base)
{
assert(info);
info->skew_base = base;
}
/**
* \brief obtain the current tempo of the queue