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topology: pre-process-class: Add helper function to look up class definition

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Add a helper function to look up the class definition for
an object. ex: for an object instance, Object.Widget.pga.0{}, the
function returns the config pointing to Class.Widget.pga{} in
the input conf.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Ranjani Sridharan 2021-04-23 12:23:19 -07:00 committed by Jaroslav Kysela
parent eb514c6bd7
commit c832f48404
3 changed files with 72 additions and 1 deletions
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2
topology/Makefile.am
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@ -8,7 +8,7 @@ endif
%.1: %.rst
rst2man $< > $@
alsatplg_SOURCES = topology.c pre-processor.c
alsatplg_SOURCES = topology.c pre-processor.c pre-process-class.c
noinst_HEADERS = topology.h pre-processor.h

68
topology/pre-process-class.c Normal file
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@ -0,0 +1,68 @@
/*
Copyright(c) 2021 Intel Corporation
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
The full GNU General Public License is included in this distribution
in the file called LICENSE.GPL.
*/
#include <limits.h>
#include <stdio.h>
#include <alsa/input.h>
#include <alsa/output.h>
#include <alsa/conf.h>
#include <alsa/error.h>
#include "topology.h"
#include "pre-processor.h"
/*
* Helper function to look up class definition from the Object config.
* ex: For an object declaration, Object.Widget.pga.0{}, return the config correspdonding to
* Class.Widget.pga{}. Note that input config , "cfg" does not include the "Object" node.
*/
snd_config_t *tplg_class_lookup(struct tplg_pre_processor *tplg_pp, snd_config_t *cfg)
{
snd_config_iterator_t first, end;
snd_config_t *class, *class_cfg = NULL;
const char *class_type, *class_name;
char *class_config_id;
int ret;
if (snd_config_get_id(cfg, &class_type) < 0)
return NULL;
first = snd_config_iterator_first(cfg);
end = snd_config_iterator_end(cfg);
if (first == end) {
SNDERR("No class name provided for object type: %s\n", class_type);
return NULL;
}
class = snd_config_iterator_entry(first);
if (snd_config_get_id(class, &class_name) < 0)
return NULL;
class_config_id = tplg_snprintf("Class.%s.%s", class_type, class_name);
if (!class_config_id)
return NULL;
ret = snd_config_search(tplg_pp->input_cfg, class_config_id, &class_cfg);
if (ret < 0)
SNDERR("No Class definition found for %s\n", class_config_id);
free(class_config_id);
return class_cfg;
}

3
topology/pre-processor.h
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@ -26,6 +26,9 @@
void tplg_pp_debug(char *fmt, ...);
void tplg_pp_config_debug(struct tplg_pre_processor *tplg_pp, snd_config_t *cfg);
/* class helpers */
snd_config_t *tplg_class_lookup(struct tplg_pre_processor *tplg_pp, snd_config_t *cfg);
/* config helpers */
snd_config_t *tplg_find_config(snd_config_t *config, const char *name);
int tplg_config_make_add(snd_config_t **config, const char *id, snd_config_type_t type,