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seq: Add API functions to set different tempo base values

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MIDI2 Set Tempo message uses 10ns-based values, and we need to update
the API to change the base time unit.

This patch adds a few new API functions:
- snd_seq_has_queue_tempo_base() returns 1 if the client supports a
  new tempo-base value; if 0, it's an old system and application has
  to use the tempo in the fixed 1us unit
- the tempo base can be changed with
  snd_seq_queue_tempo_set_tempo_base(), provided in nsec unit;
  the value has to be either 10 or 1000 (or 0 as default, equivalent
  with 1000)

The protocol version is checked and fallback to the fixed 1us base for
the old clients.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2024-07-03 15:00:20 +02:00
parent 568b2ac1db
commit 24c7f42733
6 changed files with 74 additions and 3 deletions
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3
src/Versions.in.in
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@ -206,6 +206,9 @@ ALSA_1.2.13 {
#ifdef HAVE_SEQ_SYMS
@SYMBOL_PREFIX@snd_seq_create_ump_endpoint;
@SYMBOL_PREFIX@snd_seq_create_ump_block;
@SYMBOL_PREFIX@snd_seq_queue_tempo_get_tempo_base;
@SYMBOL_PREFIX@snd_seq_queue_tempo_set_tempo_base;
@SYMBOL_PREFIX@snd_seq_has_tempo_base;
#endif
#ifdef HAVE_RAWMIDI_SYMS
@SYMBOL_PREFIX@snd_ump_endpoint_info_clear;