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ucm: implement MacroDefine and Macro subtree evaluation

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The arguments are set as temporary variables as /MACRO_NAME/_/ARGUMENT_NAME/.

Example:

  # define new macro MyMacro with arguments ctl_name and ctl_value
  DefineMacro.MyMacro {
    BootSequence [
      cset "name='${var:MyMacro_ctl_name}' ${var:MyMacro_ctl_value}"
    ]
  }

  # instantiate macro for Speaker control (short version)
  Macro.headphone.MyMacro "ctl_name='Speaker Switch',ctl_value=off"

  # instantiate macro for Mic control (second version)
  Macro.mic.MyMacro {
	ctl_name "Mic Switch"
	ctl_value "off"
  }

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2022-05-13 16:07:38 +02:00
parent 3e5a894378
commit d7d5c724ed
6 changed files with 252 additions and 9 deletions
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4
src/ucm/main.c
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@ -1398,6 +1398,10 @@ int snd_use_case_mgr_open(snd_use_case_mgr_t **uc_mgr,
if (err < 0)
goto _err;
err = snd_config_top(&mgr->macros);
if (err < 0)
goto _err;
mgr->card_name = strdup(card_name);
if (mgr->card_name == NULL) {
err = -ENOMEM;