gstreamer/ext/lv2/gstlv2utils.c

963 lines
28 KiB
C

/* GStreamer
* Copyright (C) 2016 Thibault Saunier <thibault.saunier@collabora.com>
* 2016 Stefan Sauer <ensonic@users.sf.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "string.h"
#include "stdlib.h"
#include "gstlv2.h"
#include "gstlv2utils.h"
#include "lv2/lv2plug.in/ns/ext/atom/atom.h"
#include "lv2/lv2plug.in/ns/ext/atom/forge.h"
#include <lv2/lv2plug.in/ns/ext/log/log.h>
#include <lv2/lv2plug.in/ns/ext/state/state.h>
#include <lv2/lv2plug.in/ns/ext/urid/urid.h>
GST_DEBUG_CATEGORY_EXTERN (lv2_debug);
#define GST_CAT_DEFAULT lv2_debug
/* host features */
/* - log extension */
static int
lv2_log_printf (LV2_Log_Handle handle, LV2_URID type, const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
gst_debug_log_valist (lv2_debug, GST_LEVEL_INFO, "", "", 0, NULL, fmt, ap);
va_end (ap);
return 1;
}
static int
lv2_log_vprintf (LV2_Log_Handle handle, LV2_URID type,
const char *fmt, va_list ap)
{
gst_debug_log_valist (lv2_debug, GST_LEVEL_INFO, "", "", 0, NULL, fmt, ap);
return 1;
}
static LV2_Log_Log lv2_log = {
/* handle = */ NULL, lv2_log_printf, lv2_log_vprintf
};
static const LV2_Feature lv2_log_feature = { LV2_LOG__log, &lv2_log };
/* - urid map/unmap extension */
static LV2_URID
lv2_urid_map (LV2_URID_Map_Handle handle, const char *uri)
{
return (LV2_URID) g_quark_from_string (uri);
}
static const char *
lv2_urid_unmap (LV2_URID_Unmap_Handle handle, LV2_URID urid)
{
return g_quark_to_string ((GQuark) urid);
}
static LV2_URID_Map lv2_map = {
/* handle = */ NULL, lv2_urid_map
};
static LV2_URID_Unmap lv2_unmap = {
/* handle = */ NULL, lv2_urid_unmap
};
static const LV2_Feature lv2_map_feature = { LV2_URID__map, &lv2_map };
static const LV2_Feature lv2_unmap_feature = { LV2_URID__unmap, &lv2_unmap };
/* feature list */
static const LV2_Feature *lv2_features[] = {
&lv2_log_feature,
&lv2_map_feature,
&lv2_unmap_feature,
NULL
};
gboolean
gst_lv2_check_required_features (const LilvPlugin * lv2plugin)
{
LilvNodes *required_features = lilv_plugin_get_required_features (lv2plugin);
if (required_features) {
LilvIter *i;
gint j;
gboolean missing = FALSE;
for (i = lilv_nodes_begin (required_features);
!lilv_nodes_is_end (required_features, i);
i = lilv_nodes_next (required_features, i)) {
const LilvNode *required_feature = lilv_nodes_get (required_features, i);
const char *required_feature_uri = lilv_node_as_uri (required_feature);
missing = TRUE;
for (j = 0; lv2_features[j]; j++) {
if (!strcmp (lv2_features[j]->URI, required_feature_uri)) {
missing = FALSE;
break;
}
}
if (missing) {
GST_FIXME ("lv2 plugin %s needs host feature: %s",
lilv_node_as_uri (lilv_plugin_get_uri (lv2plugin)),
required_feature_uri);
break;
}
}
lilv_nodes_free (required_features);
return (!missing);
}
return TRUE;
}
static LV2_Atom_Forge forge;
void
gst_lv2_host_init (void)
{
lv2_atom_forge_init (&forge, &lv2_map);
}
/* preset interface */
static char *
make_bundle_name (GstObject * obj, const gchar * name)
{
GstElementFactory *factory;
gchar *basename, *s, *bundle;
factory = gst_element_get_factory ((GstElement *) obj);
basename = g_strdup (gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_LONGNAME));
s = basename;
while ((s = strchr (s, ' '))) {
*s = '_';
}
bundle = g_strjoin (NULL, basename, "_", name, ".preset.lv2", NULL);
g_free (basename);
return bundle;
}
gchar **
gst_lv2_get_preset_names (GstLV2 * lv2, GstObject * obj)
{
/* lazily scan for presets when first called */
if (!lv2->presets) {
LilvNodes *presets;
if ((presets = lilv_plugin_get_related (lv2->klass->plugin, preset_class))) {
LilvIter *j;
lv2->presets = g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
(GDestroyNotify) lilv_node_free);
for (j = lilv_nodes_begin (presets);
!lilv_nodes_is_end (presets, j); j = lilv_nodes_next (presets, j)) {
const LilvNode *preset = lilv_nodes_get (presets, j);
LilvNodes *titles;
lilv_world_load_resource (world, preset);
titles = lilv_world_find_nodes (world, preset, label_pred, NULL);
if (titles) {
const LilvNode *title = lilv_nodes_get_first (titles);
g_hash_table_insert (lv2->presets,
g_strdup (lilv_node_as_string (title)),
lilv_node_duplicate (preset));
lilv_nodes_free (titles);
} else {
GST_WARNING_OBJECT (obj, "plugin has preset '%s' without rdfs:label",
lilv_node_as_string (preset));
}
}
lilv_nodes_free (presets);
}
}
if (lv2->presets) {
GList *node, *keys = g_hash_table_get_keys (lv2->presets);
gchar **names = g_new0 (gchar *, g_hash_table_size (lv2->presets) + 1);
gint i = 0;
for (node = keys; node; node = g_list_next (node)) {
names[i++] = g_strdup (node->data);
}
g_list_free (keys);
return names;
}
return NULL;
}
static void
set_port_value (const char *port_symbol, void *data, const void *value,
uint32_t size, uint32_t type)
{
gpointer *user_data = (gpointer *) data;
GstLV2Class *klass = user_data[0];
GstObject *obj = user_data[1];
gchar *prop_name = g_hash_table_lookup (klass->sym_to_name, port_symbol);
gfloat fvalue;
if (!prop_name) {
GST_WARNING_OBJECT (obj, "Preset port '%s' is missing", port_symbol);
return;
}
if (type == forge.Float) {
fvalue = *(const gfloat *) value;
} else if (type == forge.Double) {
fvalue = *(const gdouble *) value;
} else if (type == forge.Int) {
fvalue = *(const gint32 *) value;
} else if (type == forge.Long) {
fvalue = *(const gint64 *) value;
} else {
GST_WARNING_OBJECT (obj, "Preset '%s' value has bad type '%s'",
port_symbol, lv2_unmap.unmap (lv2_unmap.handle, type));
return;
}
g_object_set (obj, prop_name, fvalue, NULL);
}
gboolean
gst_lv2_load_preset (GstLV2 * lv2, GstObject * obj, const gchar * name)
{
LilvNode *preset = g_hash_table_lookup (lv2->presets, name);
LilvState *state = lilv_state_new_from_world (world, &lv2_map, preset);
gpointer user_data[] = { lv2->klass, obj };
GST_INFO_OBJECT (obj, "loading preset <%s>", lilv_node_as_string (preset));
lilv_state_restore (state, lv2->instance, set_port_value,
(gpointer) user_data, 0, NULL);
lilv_state_free (state);
return FALSE;
}
static const void *
get_port_value (const char *port_symbol, void *data, uint32_t * size,
uint32_t * type)
{
gpointer *user_data = (gpointer *) data;
GstLV2Class *klass = user_data[0];
GstObject *obj = user_data[1];
gchar *prop_name = g_hash_table_lookup (klass->sym_to_name, port_symbol);
static gfloat fvalue;
if (!prop_name) {
GST_WARNING_OBJECT (obj, "Preset port '%s' is missing", port_symbol);
*size = *type = 0;
return NULL;
}
*size = sizeof (float);
*type = forge.Float;
g_object_get (obj, prop_name, &fvalue, NULL);
/* FIXME: can we return &lv2->ports.{in,out}[x]; */
return &fvalue;
}
gboolean
gst_lv2_save_preset (GstLV2 * lv2, GstObject * obj, const gchar * name)
{
gchar *filename, *bundle, *dir, *tmp_dir;
gpointer user_data[] = { lv2->klass, obj };
LilvState *state;
LilvNode *bundle_dir;
const LilvNode *state_uri;
LilvInstance *instance = lv2->instance;
gboolean res;
#ifndef HAVE_LILV_0_22
gchar *filepath;
#endif
filename = g_strjoin (NULL, name, ".ttl", NULL);
bundle = make_bundle_name (obj, name);
/* dir needs to end on a dir separator for the lilv_new_file_uri() to work */
dir =
g_build_filename (g_get_home_dir (), ".lv2", bundle, G_DIR_SEPARATOR_S,
NULL);
tmp_dir = g_dir_make_tmp ("gstlv2-XXXXXX", NULL);
g_mkdir_with_parents (dir, 0750);
if (!instance) {
/* instance is NULL until we play!! */
instance = lilv_plugin_instantiate (lv2->klass->plugin, GST_AUDIO_DEF_RATE,
lv2_features);
}
state = lilv_state_new_from_instance (lv2->klass->plugin, instance, &lv2_map,
tmp_dir, dir, dir, dir, get_port_value, user_data,
LV2_STATE_IS_POD | LV2_STATE_IS_PORTABLE, NULL);
lilv_state_set_label (state, name);
res = lilv_state_save (world, &lv2_map, &lv2_unmap, state, /*uri */ NULL, dir,
filename) != 0;
/* reload bundle into the world */
bundle_dir = lilv_new_file_uri (world, NULL, dir);
lilv_world_unload_bundle (world, bundle_dir);
lilv_world_load_bundle (world, bundle_dir);
lilv_node_free (bundle_dir);
#ifdef HAVE_LILV_0_22
state_uri = lilv_state_get_uri (state);
#else
filepath = g_build_filename (dir, filename, NULL);
state_uri = lilv_new_uri (world, filepath);
g_free (filepath);
#endif
lilv_world_load_resource (world, state_uri);
g_hash_table_insert (lv2->presets, g_strdup (name),
lilv_node_duplicate (state_uri));
#ifndef HAVE_LILV_0_22
lilv_node_free ((LilvNode *) state_uri);
#endif
lilv_state_free (state);
if (!lv2->instance) {
lilv_instance_free (instance);
}
g_free (tmp_dir);
g_free (dir);
g_free (bundle);
g_free (filename);
return res;
}
#if 0
gboolean
gst_lv2_rename_preset (GstLV2 * lv2, GstObject * obj,
const gchar * old_name, const gchar * new_name)
{
/* need to relabel the preset */
return FALSE;
}
#endif
gboolean
gst_lv2_delete_preset (GstLV2 * lv2, GstObject * obj, const gchar * name)
{
#ifdef HAVE_LILV_0_22
LilvNode *preset = g_hash_table_lookup (lv2->presets, name);
LilvState *state = lilv_state_new_from_world (world, &lv2_map, preset);
lilv_world_unload_resource (world, lilv_state_get_uri (state));
lilv_state_delete (world, state);
lilv_state_free (state);
#endif
g_hash_table_remove (lv2->presets, name);
return FALSE;
}
/* api helpers */
void
gst_lv2_init (GstLV2 * lv2, GstLV2Class * lv2_class)
{
lv2->klass = lv2_class;
lv2->instance = NULL;
lv2->activated = FALSE;
lv2->ports.control.in = g_new0 (gfloat, lv2_class->control_in_ports->len);
lv2->ports.control.out = g_new0 (gfloat, lv2_class->control_out_ports->len);
}
void
gst_lv2_finalize (GstLV2 * lv2)
{
if (lv2->presets) {
g_hash_table_destroy (lv2->presets);
}
g_free (lv2->ports.control.in);
g_free (lv2->ports.control.out);
}
gboolean
gst_lv2_setup (GstLV2 * lv2, unsigned long rate)
{
GstLV2Class *lv2_class = lv2->klass;
GstLV2Port *port;
GArray *ports;
gint i;
if (lv2->instance)
lilv_instance_free (lv2->instance);
if (!(lv2->instance =
lilv_plugin_instantiate (lv2_class->plugin, rate, lv2_features)))
return FALSE;
/* connect the control ports */
ports = lv2_class->control_in_ports;
for (i = 0; i < ports->len; i++) {
port = &g_array_index (ports, GstLV2Port, i);
if (port->type != GST_LV2_PORT_CONTROL)
continue;
lilv_instance_connect_port (lv2->instance, port->index,
&(lv2->ports.control.in[i]));
}
ports = lv2_class->control_out_ports;
for (i = 0; i < ports->len; i++) {
port = &g_array_index (ports, GstLV2Port, i);
if (port->type != GST_LV2_PORT_CONTROL)
continue;
lilv_instance_connect_port (lv2->instance, port->index,
&(lv2->ports.control.out[i]));
}
lilv_instance_activate (lv2->instance);
lv2->activated = TRUE;
return TRUE;
}
gboolean
gst_lv2_cleanup (GstLV2 * lv2, GstObject * obj)
{
if (lv2->activated == FALSE) {
GST_ERROR_OBJECT (obj, "Deactivating but LV2 plugin not activated");
return TRUE;
}
if (lv2->instance == NULL) {
GST_ERROR_OBJECT (obj, "Deactivating but no LV2 plugin set");
return TRUE;
}
GST_DEBUG_OBJECT (obj, "deactivating");
lilv_instance_deactivate (lv2->instance);
lv2->activated = FALSE;
lilv_instance_free (lv2->instance);
lv2->instance = NULL;
return TRUE;
}
void
gst_lv2_object_set_property (GstLV2 * lv2, GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GType base, type = pspec->value_type;
/* remember, properties have an offset */
prop_id -= lv2->klass->properties;
/* only input ports */
g_return_if_fail (prop_id < lv2->klass->control_in_ports->len);
while ((base = g_type_parent (type)))
type = base;
/* now see what type it is */
switch (type) {
case G_TYPE_BOOLEAN:
lv2->ports.control.in[prop_id] =
g_value_get_boolean (value) ? 1.0f : 0.0f;
break;
case G_TYPE_INT:
lv2->ports.control.in[prop_id] = g_value_get_int (value);
break;
case G_TYPE_FLOAT:
lv2->ports.control.in[prop_id] = g_value_get_float (value);
break;
case G_TYPE_ENUM:
lv2->ports.control.in[prop_id] = g_value_get_enum (value);
break;
default:
GST_WARNING_OBJECT (object, "unhandled type: %s",
g_type_name (pspec->value_type));
g_assert_not_reached ();
}
}
void
gst_lv2_object_get_property (GstLV2 * lv2, GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GType base, type = pspec->value_type;
gfloat *controls;
/* remember, properties have an offset */
prop_id -= lv2->klass->properties;
if (prop_id < lv2->klass->control_in_ports->len) {
controls = lv2->ports.control.in;
} else if (prop_id < lv2->klass->control_in_ports->len +
lv2->klass->control_out_ports->len) {
controls = lv2->ports.control.out;
prop_id -= lv2->klass->control_in_ports->len;
} else {
g_return_if_reached ();
}
while ((base = g_type_parent (type)))
type = base;
/* now see what type it is */
switch (type) {
case G_TYPE_BOOLEAN:
g_value_set_boolean (value, controls[prop_id] > 0.0f);
break;
case G_TYPE_INT:
g_value_set_int (value, CLAMP (controls[prop_id], G_MININT, G_MAXINT));
break;
case G_TYPE_FLOAT:
g_value_set_float (value, controls[prop_id]);
break;
case G_TYPE_ENUM:
g_value_set_enum (value, (gint) controls[prop_id]);
break;
default:
GST_WARNING_OBJECT (object, "unhandled type: %s",
g_type_name (pspec->value_type));
g_return_if_reached ();
}
}
static gchar *
gst_lv2_class_get_param_name (GstLV2Class * klass, GObjectClass * object_class,
const gchar * port_symbol)
{
gchar *ret = g_strdup (port_symbol);
/* this is the same thing that param_spec_* will do */
g_strcanon (ret, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-", '-');
/* satisfy glib2 (argname[0] must be [A-Za-z]) */
if (!((ret[0] >= 'a' && ret[0] <= 'z') || (ret[0] >= 'A' && ret[0] <= 'Z'))) {
gchar *tempstr = ret;
ret = g_strconcat ("param-", ret, NULL);
g_free (tempstr);
}
/* check for duplicate property names */
if (g_object_class_find_property (object_class, ret)) {
gint n = 1;
gchar *nret = g_strdup_printf ("%s-%d", ret, n++);
while (g_object_class_find_property (object_class, nret)) {
g_free (nret);
nret = g_strdup_printf ("%s-%d", ret, n++);
}
g_free (ret);
ret = nret;
}
GST_DEBUG ("built property name '%s' from port name '%s'", ret, port_symbol);
return ret;
}
static gchar *
gst_lv2_class_get_param_nick (GstLV2Class * klass, const LilvPort * port)
{
const LilvPlugin *lv2plugin = klass->plugin;
return g_strdup (lilv_node_as_string (lilv_port_get_name (lv2plugin, port)));
}
static int
enum_val_cmp (GEnumValue * p1, GEnumValue * p2)
{
return p1->value - p2->value;
}
static GParamSpec *
gst_lv2_class_get_param_spec (GstLV2Class * klass, GObjectClass * object_class,
gint portnum)
{
const LilvPlugin *lv2plugin = klass->plugin;
const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, portnum);
LilvNode *lv2def, *lv2min, *lv2max;
LilvScalePoints *points;
GParamSpec *ret;
gchar *name, *nick;
gint perms;
gfloat lower = 0.0f, upper = 1.0f, def = 0.0f;
GType enum_type = G_TYPE_INVALID;
const gchar *port_symbol =
lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port));
nick = gst_lv2_class_get_param_nick (klass, port);
name = gst_lv2_class_get_param_name (klass, object_class, port_symbol);
GST_DEBUG ("%s trying port %s : %s",
lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, nick);
perms = G_PARAM_READABLE;
if (lilv_port_is_a (lv2plugin, port, input_class))
perms |= G_PARAM_WRITABLE | G_PARAM_CONSTRUCT;
if (lilv_port_is_a (lv2plugin, port, control_class) ||
lilv_port_is_a (lv2plugin, port, cv_class))
perms |= GST_PARAM_CONTROLLABLE;
if (lilv_port_has_property (lv2plugin, port, toggled_prop)) {
ret = g_param_spec_boolean (name, nick, nick, FALSE, perms);
goto done;
}
lilv_port_get_range (lv2plugin, port, &lv2def, &lv2min, &lv2max);
if (lv2def)
def = lilv_node_as_float (lv2def);
if (lv2min)
lower = lilv_node_as_float (lv2min);
if (lv2max)
upper = lilv_node_as_float (lv2max);
lilv_node_free (lv2def);
lilv_node_free (lv2min);
lilv_node_free (lv2max);
if (def < lower) {
if (lv2def && lv2min) {
GST_WARNING ("%s:%s has lower bound %f > default %f",
lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, lower,
def);
}
lower = def;
}
if (def > upper) {
if (lv2def && lv2max) {
GST_WARNING ("%s:%s has upper bound %f < default %f",
lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, upper,
def);
}
upper = def;
}
if ((points = lilv_port_get_scale_points (lv2plugin, port))) {
GEnumValue *enums;
LilvIter *i;
gint j = 0, n, def_ix = -1;
n = lilv_scale_points_size (points);
enums = g_new (GEnumValue, n + 1);
for (i = lilv_scale_points_begin (points);
!lilv_scale_points_is_end (points, i);
i = lilv_scale_points_next (points, i)) {
const LilvScalePoint *point = lilv_scale_points_get (points, i);
gfloat v = lilv_node_as_float (lilv_scale_point_get_value (point));
const gchar *l = lilv_node_as_string (lilv_scale_point_get_label (point));
/* check if value can be safely converted to int */
if (v != (gint) v) {
GST_INFO ("%s:%s non integer scale point %lf, %s",
lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, v, l);
break;
}
if (v == def) {
def_ix = j;
}
enums[j].value = (gint) v;
enums[j].value_nick = enums[j].value_name = l;
GST_LOG ("%s:%s enum: %lf, %s",
lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, v, l);
j++;
}
if (j == n) {
gchar *type_name;
/* scalepoints are not sorted */
qsort (enums, n, sizeof (GEnumValue),
(int (*)(const void *, const void *)) enum_val_cmp);
if (def_ix == -1) {
if (lv2def) {
GST_WARNING ("%s:%s has default %f outside of scalepoints",
lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, def);
}
def = enums[0].value;
}
/* terminator */
enums[j].value = 0;
enums[j].value_name = enums[j].value_nick = NULL;
type_name = g_strdup_printf ("%s%s",
g_type_name (G_TYPE_FROM_CLASS (object_class)), name);
enum_type = g_enum_register_static (type_name, enums);
g_free (type_name);
} else {
g_free (enums);
}
lilv_scale_points_free (points);
}
if (enum_type != G_TYPE_INVALID) {
ret = g_param_spec_enum (name, nick, nick, enum_type, def, perms);
} else if (lilv_port_has_property (lv2plugin, port, integer_prop))
ret = g_param_spec_int (name, nick, nick, lower, upper, def, perms);
else
ret = g_param_spec_float (name, nick, nick, lower, upper, def, perms);
done:
// build a map of (port_symbol to ret->name) for extensions
g_hash_table_insert (klass->sym_to_name, (gchar *) port_symbol,
(gchar *) ret->name);
g_free (name);
g_free (nick);
return ret;
}
void
gst_lv2_class_install_properties (GstLV2Class * lv2_class,
GObjectClass * object_class, guint offset)
{
GParamSpec *p;
guint i;
lv2_class->properties = offset;
for (i = 0; i < lv2_class->control_in_ports->len; i++, offset++) {
p = gst_lv2_class_get_param_spec (lv2_class, object_class,
g_array_index (lv2_class->control_in_ports, GstLV2Port, i).index);
g_object_class_install_property (object_class, offset, p);
}
for (i = 0; i < lv2_class->control_out_ports->len; i++, offset++) {
p = gst_lv2_class_get_param_spec (lv2_class, object_class,
g_array_index (lv2_class->control_out_ports, GstLV2Port, i).index);
g_object_class_install_property (object_class, offset, p);
}
}
void
gst_lv2_element_class_set_metadata (GstLV2Class * lv2_class,
GstElementClass * elem_class, const gchar * lv2_class_tags)
{
const LilvPlugin *lv2plugin = lv2_class->plugin;
LilvNode *val;
const LilvPluginClass *lv2plugin_class;
const LilvNode *cval;
gchar *longname, *author, *class_tags = NULL;
val = lilv_plugin_get_name (lv2plugin);
if (val) {
longname = g_strdup (lilv_node_as_string (val));
lilv_node_free (val);
} else {
longname = g_strdup ("no description available");
}
val = lilv_plugin_get_author_name (lv2plugin);
if (val) {
// TODO: check lilv_plugin_get_author_email(lv2plugin);
author = g_strdup (lilv_node_as_string (val));
lilv_node_free (val);
} else {
author = g_strdup ("no author available");
}
// TODO: better description from:
// lilv_plugin_get_author_homepage() and lilv_plugin_get_project()
lv2plugin_class = lilv_plugin_get_class (lv2plugin);
cval = lilv_plugin_class_get_label (lv2plugin_class);
if (cval) {
class_tags = g_strconcat (lv2_class_tags, "/", lilv_node_as_string (cval),
NULL);
}
gst_element_class_set_metadata (elem_class, longname,
(class_tags ? class_tags : lv2_class_tags), longname, author);
g_free (longname);
g_free (author);
g_free (class_tags);
}
void
gst_lv2_class_init (GstLV2Class * lv2_class, GType type)
{
const GValue *value =
gst_structure_get_value (lv2_meta_all, g_type_name (type));
GstStructure *lv2_meta = g_value_get_boxed (value);
const LilvPlugin *lv2plugin;
guint j, in_pad_index = 0, out_pad_index = 0;
const LilvPlugins *plugins = lilv_world_get_all_plugins (world);
LilvNode *plugin_uri;
const gchar *element_uri;
GST_DEBUG ("LV2 initializing class");
element_uri = gst_structure_get_string (lv2_meta, "element-uri");
plugin_uri = lilv_new_uri (world, element_uri);
g_assert (plugin_uri);
lv2plugin = lilv_plugins_get_by_uri (plugins, plugin_uri);
g_assert (lv2plugin);
lv2_class->plugin = lv2plugin;
lilv_node_free (plugin_uri);
lv2_class->sym_to_name = g_hash_table_new (g_str_hash, g_str_equal);
lv2_class->in_group.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
lv2_class->out_group.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
lv2_class->control_in_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
lv2_class->control_out_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
/* find ports and groups */
for (j = 0; j < lilv_plugin_get_num_ports (lv2plugin); j++) {
const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, j);
const gboolean is_input = lilv_port_is_a (lv2plugin, port, input_class);
const gboolean is_optional = lilv_port_has_property (lv2plugin, port,
optional_pred);
GstLV2Port desc = { j, GST_LV2_PORT_AUDIO, -1, };
LilvNodes *lv2group = lilv_port_get (lv2plugin, port, group_pred);
/* FIXME Handle channels positionning
* GstAudioChannelPosition position = GST_AUDIO_CHANNEL_POSITION_INVALID; */
if (lv2group) {
/* port is part of a group */
const gchar *group_uri = lilv_node_as_uri (lv2group);
GstLV2Group *group = is_input
? &lv2_class->in_group : &lv2_class->out_group;
if (group->uri == NULL) {
group->uri = g_strdup (group_uri);
group->pad = is_input ? in_pad_index++ : out_pad_index++;
group->ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
}
/* FIXME Handle channels positionning
position = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
sub_values = lilv_port_get_value (lv2plugin, port, designation_pred);
if (lilv_nodes_size (sub_values) > 0) {
LilvNode *role = lilv_nodes_get_at (sub_values, 0);
position = gst_lv2_filter_role_to_position (role);
}
lilv_nodes_free (sub_values);
if (position != GST_AUDIO_CHANNEL_POSITION_INVALID) {
desc.position = position;
} */
g_array_append_val (group->ports, desc);
} else {
/* port is not part of a group, or it is part of a group but that group
* is illegal so we just ignore it */
if (lilv_port_is_a (lv2plugin, port, audio_class)) {
if (is_input) {
desc.pad = in_pad_index++;
g_array_append_val (lv2_class->in_group.ports, desc);
} else {
desc.pad = out_pad_index++;
g_array_append_val (lv2_class->out_group.ports, desc);
}
} else if (lilv_port_is_a (lv2plugin, port, control_class)) {
desc.type = GST_LV2_PORT_CONTROL;
if (is_input) {
lv2_class->num_control_in++;
g_array_append_val (lv2_class->control_in_ports, desc);
} else {
lv2_class->num_control_out++;
g_array_append_val (lv2_class->control_out_ports, desc);
}
} else if (lilv_port_is_a (lv2plugin, port, cv_class)) {
desc.type = GST_LV2_PORT_CV;
if (is_input) {
lv2_class->num_cv_in++;
g_array_append_val (lv2_class->control_in_ports, desc);
} else {
lv2_class->num_cv_out++;
g_array_append_val (lv2_class->control_out_ports, desc);
}
} else if (lilv_port_is_a (lv2plugin, port, event_class)) {
LilvNodes *supported = lilv_port_get_value (lv2plugin, port,
supports_event_pred);
GST_INFO ("%s: unhandled event port %d: %s, optional=%d, input=%d",
element_uri, j,
lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port)),
is_optional, is_input);
if (lilv_nodes_size (supported) > 0) {
LilvIter *i;
for (i = lilv_nodes_begin (supported);
!lilv_nodes_is_end (supported, i);
i = lilv_nodes_next (supported, i)) {
const LilvNode *value = lilv_nodes_get (supported, i);
GST_INFO (" type = %s", lilv_node_as_uri (value));
}
}
lilv_nodes_free (supported);
// FIXME: handle them
} else {
/* unhandled port type */
const LilvNodes *classes = lilv_port_get_classes (lv2plugin, port);
GST_INFO ("%s: unhandled port %d: %s, optional=%d, input=%d",
element_uri, j,
lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port)),
is_optional, is_input);
if (classes && lilv_nodes_size (classes) > 0) {
LilvIter *i;
// FIXME: we getting the same classe multiple times
for (i = lilv_nodes_begin (classes);
!lilv_nodes_is_end (classes, i);
i = lilv_nodes_next (classes, i)) {
const LilvNode *value = lilv_nodes_get (classes, i);
GST_INFO (" class = %s", lilv_node_as_uri (value));
}
}
}
}
}
}
void
gst_lv2_class_finalize (GstLV2Class * lv2_class)
{
GST_DEBUG ("LV2 finalizing class");
g_hash_table_destroy (lv2_class->sym_to_name);
g_array_free (lv2_class->in_group.ports, TRUE);
lv2_class->in_group.ports = NULL;
g_array_free (lv2_class->out_group.ports, TRUE);
lv2_class->out_group.ports = NULL;
g_array_free (lv2_class->control_in_ports, TRUE);
lv2_class->control_in_ports = NULL;
g_array_free (lv2_class->control_out_ports, TRUE);
lv2_class->control_out_ports = NULL;
}