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tools: gst-inspect: print action signals as emit_by_name() invocations

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It's quite confusing to print a function callback signature for
action signals when people need to do a g_signal_by_name() invocation
in order to use this feature. Requires too much background knowledge
about how GObject works under the hood to make sense of that.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5206>
This commit is contained in:
Tim-Philipp Müller 2023-03-28 19:58:30 +01:00
parent 65eb526444
commit 9bf6919f7f
1 changed files with 33 additions and 16 deletions
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49
subprojects/gstreamer/tools/gst-inspect.c
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@ -1095,11 +1095,13 @@ print_signal_info (GstElement * element)
GSList *found_signals, *l;
for (k = 0; k < 2; k++) {
gboolean want_actions = (k == 1);
found_signals = NULL;
/* For elements that have sometimes pads, also list a few useful GstElement
* signals. Put these first, so element-specific ones come later. */
if (k == 0 && has_sometimes_template (element)) {
if (!want_actions && has_sometimes_template (element)) {
query = g_new0 (GSignalQuery, 1);
g_signal_query (g_signal_lookup ("pad-added", GST_TYPE_ELEMENT), query);
found_signals = g_slist_append (found_signals, query);
@ -1124,8 +1126,8 @@ print_signal_info (GstElement * element)
query = g_new0 (GSignalQuery, 1);
g_signal_query (signals[i], query);
if ((k == 0 && !(query->signal_flags & G_SIGNAL_ACTION)) ||
(k == 1 && (query->signal_flags & G_SIGNAL_ACTION)))
if ((!want_actions && !(query->signal_flags & G_SIGNAL_ACTION)) ||
(want_actions && (query->signal_flags & G_SIGNAL_ACTION)))
found_signals = g_slist_append (found_signals, query);
else
g_free (query);
@ -1136,7 +1138,7 @@ print_signal_info (GstElement * element)
if (found_signals) {
n_print ("\n");
if (k == 0)
if (!want_actions)
n_print ("%sElement Signals%s:\n", HEADING_COLOR, RESET_COLOR);
else
n_print ("%sElement Actions%s:\n", HEADING_COLOR, RESET_COLOR);
@ -1153,18 +1155,28 @@ print_signal_info (GstElement * element)
query = (GSignalQuery *) l->data;
retval_type_name = pretty_type_name (query->return_type, &pmark);
indent_len =
strlen (query->signal_name) + strlen (retval_type_name) + 24 +
strlen (pmark) - 1;
indent_len = strlen (query->signal_name) + strlen (retval_type_name);
indent_len += strlen (pmark) - 1;
indent_len += (want_actions) ? 36 : 24;
indent = g_new0 (gchar, indent_len + 1);
memset (indent, ' ', indent_len);
n_print (" %s\"%s\"%s : %s%s%s%suser_function%s (%s%s%s * object%s",
PROP_NAME_COLOR, query->signal_name, RESET_COLOR,
DATATYPE_COLOR, retval_type_name, PROP_VALUE_COLOR,
pmark, RESET_COLOR, DATATYPE_COLOR, g_type_name (type),
PROP_VALUE_COLOR, RESET_COLOR);
if (want_actions) {
n_print
(" %s\"%s\"%s -> %s%s%s %s: g_signal_emit_by_name%s (%selement%s, %s\"%s\"%s",
PROP_NAME_COLOR, query->signal_name, RESET_COLOR, DATATYPE_COLOR,
retval_type_name, PROP_VALUE_COLOR, pmark,
RESET_COLOR, PROP_VALUE_COLOR, RESET_COLOR, PROP_NAME_COLOR,
query->signal_name, RESET_COLOR);
} else {
n_print (" %s\"%s\"%s : %s%s%s%suser_function%s (%s%s%s * object%s",
PROP_NAME_COLOR, query->signal_name, RESET_COLOR,
DATATYPE_COLOR, retval_type_name, PROP_VALUE_COLOR,
pmark, RESET_COLOR, DATATYPE_COLOR, g_type_name (type),
PROP_VALUE_COLOR, RESET_COLOR);
}
for (j = 0; j < query->n_params; j++) {
const gchar *type_name, *asterisk, *const_prefix;
@ -1183,13 +1195,18 @@ print_signal_info (GstElement * element)
type_name, PROP_VALUE_COLOR, asterisk, j, RESET_COLOR);
}
if (k == 0) {
if (!want_actions) {
g_print (",\n");
n_print ("%s%sgpointer %suser_data%s);\n", indent, DATATYPE_COLOR,
PROP_VALUE_COLOR, RESET_COLOR);
} else
g_print (");\n");
} else if (query->return_type == G_TYPE_NONE) {
n_print ("%s);\n", RESET_COLOR);
} else {
g_print (",\n");
n_print ("%s%s%s%s *%sp_return_value%s);\n", indent, DATATYPE_COLOR,
g_type_name (query->return_type), PROP_VALUE_COLOR, pmark,
RESET_COLOR);
}
g_free (indent);
g_print ("\n");
}