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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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10
include/seq_event.h
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@ -98,8 +98,8 @@ enum snd_seq_event_type {
SND_SEQ_EVENT_CLOCK,
/** MIDI Real Time Tick message; event data type = #snd_seq_ev_queue_control_t */
SND_SEQ_EVENT_TICK,
/** Sync signal; event data type = #snd_seq_ev_queue_control_t */
SND_SEQ_EVENT_SYNC,
/** Queue timer skew; event data type = #snd_seq_ev_queue_control_t */
SND_SEQ_EVENT_QUEUE_SKEW,
/** Sync position changed; event data type = #snd_seq_ev_queue_control_t */
SND_SEQ_EVENT_SYNC_POS,
@ -403,6 +403,11 @@ typedef struct snd_seq_result {
int result; /**< status */
} snd_seq_result_t;
/** Queue skew values */
typedef struct snd_seq_queue_skew {
unsigned int value;
unsigned int base;
} snd_seq_queue_skew_t;
/** queue timer control */
typedef struct snd_seq_ev_queue_control {
@ -412,6 +417,7 @@ typedef struct snd_seq_ev_queue_control {
signed int value; /**< affected value (e.g. tempo) */
snd_seq_timestamp_t time; /**< time */
unsigned int position; /**< sync position */
snd_seq_queue_skew_t skew; /**< queue skew */
unsigned int d32[2]; /**< any data */
unsigned char d8[8]; /**< any data */
} param; /**< data value union */