alsa-acp: Add libacp based card device

libacp is a port and wrapper around the pulseaudio card profile code.
It uses a set of templates for construct a card profile and mixer port
settings. It also has support for UCM when available for the hardware.

spa/plugins/alsa/acp/conf-parser.h

@@ -0,0 +1,88 @@
+#ifndef fooconfparserhfoo
+#define fooconfparserhfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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 Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <stdbool.h>
+
+#include "compat.h"
+
+/* An abstract parser for simple, line based, shallow configuration
+ * files consisting of variable assignments only. */
+
+typedef struct pa_config_parser_state pa_config_parser_state;
+
+typedef int (*pa_config_parser_cb_t)(pa_config_parser_state *state);
+
+/* Wraps info for parsing a specific configuration variable */
+typedef struct pa_config_item {
+    const char *lvalue; /* name of the variable */
+    pa_config_parser_cb_t parse; /* Function that is called to parse the variable's value */
+    void *data; /* Where to store the variable's data */
+    const char *section;
+} pa_config_item;
+
+struct pa_config_parser_state {
+    const char *filename;
+    unsigned lineno;
+    char *section;
+    char *lvalue;
+    char *rvalue;
+    void *data; /* The data pointer of the current pa_config_item. */
+    void *userdata; /* The pointer that was given to pa_config_parse(). */
+
+    /* Private data to be used only by conf-parser.c. */
+    const pa_config_item *item_table;
+    char buf[4096];
+    pa_proplist *proplist;
+    bool in_proplist;
+};
+
+/* The configuration file parsing routine. Expects a table of
+ * pa_config_items in *t that is terminated by an item where lvalue is
+ * NULL.
+ *
+ * If use_dot_d is true, then after parsing the file named by the filename
+ * argument, the function will parse all files ending with ".conf" in
+ * alphabetical order from a directory whose name is filename + ".d", if such
+ * directory exists.
+ *
+ * Some configuration files may contain a Properties section, which
+ * is a bit special. Normally all accepted lvalues must be predefined
+ * in the pa_config_item table, but in the Properties section the
+ * pa_config_item table is ignored, and all lvalues are accepted (as
+ * long as they are valid proplist keys). If the proplist pointer is
+ * non-NULL, the parser will parse any section named "Properties" as
+ * properties, and those properties will be merged into the given
+ * proplist. If proplist is NULL, then sections named "Properties"
+ * are not allowed at all in the configuration file. */
+int pa_config_parse(const char *filename, FILE *f, const pa_config_item *t, pa_proplist *proplist, bool use_dot_d,
+                    void *userdata);
+
+/* Generic parsers for integers, size_t, booleans and strings */
+int pa_config_parse_int(pa_config_parser_state *state);
+int pa_config_parse_unsigned(pa_config_parser_state *state);
+int pa_config_parse_size(pa_config_parser_state *state);
+int pa_config_parse_bool(pa_config_parser_state *state);
+int pa_config_parse_not_bool(pa_config_parser_state *state);
+int pa_config_parse_string(pa_config_parser_state *state);
+
+#endif