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Experimental synchronization support on ALSA sequencer

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This commit is contained in:
Takashi Iwai 2000-09-05 17:15:11 +00:00
parent 761d5e6442
commit d1d906e295
3 changed files with 201 additions and 60 deletions
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112
src/seq/seq.c
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@ -504,6 +504,23 @@ int snd_seq_alloc_queue(snd_seq_t *seq)
return snd_seq_alloc_named_queue(seq, NULL);
}
#ifdef SND_SEQ_SYNC_SUPPORT
int snd_seq_alloc_sync_queue(snd_seq_t *seq, char *name)
{
snd_seq_queue_info_t info;
if (!seq)
return -EINVAL;
memset(&info, 0, sizeof(info));
info.locked = 1;
if (name)
strncpy(info.name, name, sizeof(info.name) - 1);
info.flags = SND_SEQ_QUEUE_FLG_SYNC;
return snd_seq_create_queue(seq, &info);
}
#endif
int snd_seq_free_queue(snd_seq_t *seq, int q)
{
snd_seq_queue_info_t info;
@ -553,6 +570,101 @@ int snd_seq_get_named_queue(snd_seq_t *seq, char *name)
/*----------------------------------------------------------------*/
#ifdef SND_SEQ_SYNC_SUPPORT
/*
* sync stuff
*/
int snd_seq_add_sync_master(snd_seq_t *seq,
int queue,
snd_seq_addr_t *dest,
snd_seq_queue_sync_t *info)
{
snd_seq_port_subscribe_t subs;
memset(&subs, 0, sizeof(subs));
subs.convert_time = 1;
if (info->format & SND_SEQ_SYNC_TIME)
subs.realtime = 1;
subs.sync = 1;
subs.sender.client = SND_SEQ_CLIENT_SYSTEM;
subs.sender.port = snd_seq_queue_sync_port(queue);
subs.dest = *dest;
subs.queue = queue;
subs.opt.sync_info = *info;
return snd_seq_subscribe_port(seq, &subs);
}
int snd_seq_add_sync_std_master(snd_seq_t *seq,
int queue,
snd_seq_addr_t *dest,
int format, int time_format,
unsigned char *optinfo)
{
snd_seq_queue_sync_t sync_info;
memset(&sync_info, 0, sizeof(sync_info));
sync_info.format = format;
sync_info.time_format = time_format;
if (optinfo)
memcpy(sync_info.info, optinfo, sizeof(sync_info.info));
return snd_seq_add_sync_master(seq, queue, dest, &sync_info);
}
int snd_seq_remove_sync_master(snd_seq_t *seq, int queue, snd_seq_addr_t *dest)
{
snd_seq_port_subscribe_t subs;
memset(&subs, 0, sizeof(subs));
subs.sync = 1;
subs.sender.client = SND_SEQ_CLIENT_SYSTEM;
subs.sender.port = snd_seq_queue_sync_port(queue);
subs.dest = *dest;
subs.queue = queue;
return snd_seq_unsubscribe_port(seq, &subs);
}
int snd_seq_set_sync_slave(snd_seq_t *seq,
int queue,
snd_seq_addr_t *src,
snd_seq_queue_sync_t *info)
{
snd_seq_port_subscribe_t subs;
memset(&subs, 0, sizeof(subs));
subs.convert_time = 1;
if (info->format & SND_SEQ_SYNC_TIME)
subs.realtime = 1;
subs.sync = 1;
subs.sender = *src;
subs.dest.client = SND_SEQ_CLIENT_SYSTEM;
subs.dest.port = snd_seq_queue_sync_port(queue);
subs.queue = queue;
subs.opt.sync_info = *info;
return snd_seq_subscribe_port(seq, &subs);
}
int snd_seq_reset_sync_slave(snd_seq_t *seq, int queue, snd_seq_addr_t *src)
{
snd_seq_port_subscribe_t subs;
memset(&subs, 0, sizeof(subs));
subs.sync = 1;
subs.sender = *src;
subs.dest.client = SND_SEQ_CLIENT_SYSTEM;
subs.dest.port = snd_seq_queue_sync_port(queue);
subs.queue = queue;
return snd_seq_unsubscribe_port(seq, &subs);
}
#endif
/*----------------------------------------------------------------*/
/*
* create an event cell
*/