[alsa-devel] [PATCH - UCM 1/1] ucm: add binary configure file parse

[han.lu at intel.com]

From: "Lu, Han" <han.lu at intel.com>

with cset command, UCM set kcontrol parameters directly:
    cset "name='<KCONTROL_NAME>' 1<,2,3,...>"
This patch enables UCM to set kcontrol with parameters from
configure file:
    cset-bin-file "name='<KCONTROL_NAME>' <path/to/file>"
where "cset-bin-file" is a newly added keyword alongside of "cset",
to indicate cset with binary data in file.
The binary data in file is parameter for audio DSPs, and it's just
passed by UCM/ALSA as raw data. The data type of the parameter
element must be byte, and the count is limited by the size of
struct snd_ctl_elem_value and driver definition.

Signed-off-by: Lu, Han <han.lu at intel.com>

diff --git a/src/ucm/main.c b/src/ucm/main.c
index 37ae4c8..a1b1fb6 100644
--- a/src/ucm/main.c
+++ b/src/ucm/main.c
@@ -160,11 +160,57 @@ static int open_ctl(snd_use_case_mgr_t *uc_mgr,
 	return 0;
 }
 
+static int binary_file_parse(snd_ctl_elem_value_t *dst,
+			      snd_ctl_elem_info_t *info,
+			      const char *filepath)
+{
+	int err, fd;
+	struct stat st;
+	size_t sz;
+	char *res;
+	snd_ctl_elem_type_t type;
+	unsigned int idx, count;
+
+	type = snd_ctl_elem_info_get_type(info);
+	if (type != SND_CTL_ELEM_TYPE_BYTES) {
+		uc_error("only support byte type!");
+		err = -EINVAL;
+		return err;
+	}
+	fd = open(filepath, O_RDONLY);
+	if (fd < 0) {
+		err = -errno;
+		return err;
+	}
+	if (stat(filepath, &st) == -1) {
+		err = -errno;
+		goto __fail;
+	}
+	sz = st.st_size;
+	if (sz > sizeof(dst->value.bytes))
+		sz = sizeof(dst->value.bytes);
+	count = snd_ctl_elem_info_get_count(info);
+	if (sz > count)
+		sz = count;
+	res = calloc(sz, 1);
+	if (res == NULL) {
+		err = -ENOMEM;
+		goto __fail;
+	}
+	read(fd, res, sz);
+	for (idx = 0; idx < sz; idx++)
+		snd_ctl_elem_value_set_byte(dst, idx, *(res + idx));
+	free(res);
+      __fail:
+	close(fd);
+	return err;
+}
+
 extern int __snd_ctl_ascii_elem_id_parse(snd_ctl_elem_id_t *dst,
 					 const char *str,
 					 const char **ret_ptr);
 
-static int execute_cset(snd_ctl_t *ctl, const char *cset)
+static int execute_cset(snd_ctl_t *ctl, const char *cset, unsigned int type)
 {
 	const char *pos;
 	int err;
@@ -194,7 +240,10 @@ static int execute_cset(snd_ctl_t *ctl, const char *cset)
 	err = snd_ctl_elem_info(ctl, info);
 	if (err < 0)
 		goto __fail;
-	err = snd_ctl_ascii_value_parse(ctl, value, info, pos);
+	if (type == SEQUENCE_ELEMENT_TYPE_CSET_BIN_FILE)
+		err = binary_file_parse(value, info, pos);
+	else
+		err = snd_ctl_ascii_value_parse(ctl, value, info, pos);
 	if (err < 0)
 		goto __fail;
 	err = snd_ctl_elem_write(ctl, value);
@@ -239,6 +288,7 @@ static int execute_sequence(snd_use_case_mgr_t *uc_mgr,
 				goto __fail_nomem;
 			break;
 		case SEQUENCE_ELEMENT_TYPE_CSET:
+		case SEQUENCE_ELEMENT_TYPE_CSET_BIN_FILE:
 			if (cdev == NULL) {
 				const char *cdev1 = NULL, *cdev2 = NULL;
 				err = get_value3(&cdev1, "PlaybackCTL",
@@ -274,7 +324,7 @@ static int execute_sequence(snd_use_case_mgr_t *uc_mgr,
 					goto __fail;
 				}
 			}
-			err = execute_cset(ctl, s->data.cset);
+			err = execute_cset(ctl, s->data.cset, s->type);
 			if (err < 0) {
 				uc_error("unable to execute cset '%s'\n", s->data.cset);
 				goto __fail;
diff --git a/src/ucm/parser.c b/src/ucm/parser.c
index d7517f6..9e1cb41 100644
--- a/src/ucm/parser.c
+++ b/src/ucm/parser.c
@@ -306,6 +306,16 @@ static int parse_sequence(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED,
 			continue;
 		}
 
+		if (strcmp(cmd, "cset-bin-file") == 0) {
+			curr->type = SEQUENCE_ELEMENT_TYPE_CSET_BIN_FILE;
+			err = parse_string(n, &curr->data.cset);
+			if (err < 0) {
+				uc_error("error: cset-bin-file requires a string!");
+				return err;
+			}
+			continue;
+		}
+
 		if (strcmp(cmd, "usleep") == 0) {
 			curr->type = SEQUENCE_ELEMENT_TYPE_SLEEP;
 			err = snd_config_get_integer(n, &curr->data.sleep);
diff --git a/src/ucm/ucm_local.h b/src/ucm/ucm_local.h
index 87f14a2..c1655c7 100644
--- a/src/ucm/ucm_local.h
+++ b/src/ucm/ucm_local.h
@@ -47,6 +47,7 @@
 #define SEQUENCE_ELEMENT_TYPE_CSET	2
 #define SEQUENCE_ELEMENT_TYPE_SLEEP	3
 #define SEQUENCE_ELEMENT_TYPE_EXEC	4
+#define SEQUENCE_ELEMENT_TYPE_CSET_BIN_FILE	5
 
 struct ucm_value {
         struct list_head list;
-- 
2.1.0