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gstreamer/ext/lv2/gstlv2.c
Stefan Sauer dfa6fb3c86 lv2: add a source plugin 
Update the readme with a working example and list what feature are supported.
2016-05-13 11:54:08 -07:00

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/* GStreamer
* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
* 2001 Steve Baker <stevebaker_org@yahoo.co.uk>
* 2003 Andy Wingo <wingo at pobox.com>
* 2016 Thibault Saunier <thibault.saunier@collabora.com>
*
* 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.
*/
/**
* SECTION:element-lv2
* @short_description: bridge for LV2.
*
* LV2 is a standard for plugins and matching host applications,
* mainly targeted at audio processing and generation. It is intended as
* a successor to LADSPA (Linux Audio Developer's Simple Plugin API).
*
* The LV2 element is a bridge for plugins using the
* <ulink url="http://www.lv2plug.in/">LV2</ulink> API. It scans all
* installed LV2 plugins and registers them as gstreamer elements.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstlv2.h"
#include <gst/audio/audio-channels.h>
#include <lv2/lv2plug.in/ns/ext/port-groups/port-groups.h>
GST_DEBUG_CATEGORY (lv2_debug);
#define GST_CAT_DEFAULT lv2_debug
#define GST_LV2_DEFAULT_PATH \
"/usr/lib/lv2" G_SEARCHPATH_SEPARATOR_S \
"/usr/local/lib/lv2" G_SEARCHPATH_SEPARATOR_S \
LIBDIR "/lv2"
/* search the plugin path
*/
static gboolean
lv2_plugin_discover (GstPlugin * plugin)
{
guint j, num_sink_pads, num_src_pads;
LilvIter *i;
const LilvPlugins *plugins = lilv_world_get_all_plugins (world);
for (i = lilv_plugins_begin (plugins); !lilv_plugins_is_end (plugins, i);
i = lilv_plugins_next (plugins, i)) {
const LilvPlugin *lv2plugin = lilv_plugins_get (plugins, i);
const gchar *plugin_uri, *p;
LilvNodes *required_features;
gchar *type_name;
GHashTable *port_groups = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, NULL);
plugin_uri = lilv_node_as_uri (lilv_plugin_get_uri (lv2plugin));
/* construct the type name from plugin URI */
if ((p = strstr (plugin_uri, "://"))) {
/* cut off the protocol (e.g. http://) */
type_name = g_strdup (&p[3]);
} else {
type_name = g_strdup (plugin_uri);
}
g_strcanon (type_name, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-+", '-');
/* if it's already registered, drop it */
if (g_type_from_name (type_name))
goto next;
/* check if we support the required host features */
required_features = lilv_plugin_get_required_features (lv2plugin);
if (required_features) {
GST_FIXME ("lv2 plugin %s needs host features", plugin_uri);
// TODO: implement host features, will be passed to
// lilv_plugin_instantiate()
goto next;
}
/* check if this has any audio ports */
num_sink_pads = num_src_pads = 0;
for (j = 0; j < lilv_plugin_get_num_ports (lv2plugin); j++) {
const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, j);
if (lilv_port_is_a (lv2plugin, port, audio_class)) {
const gboolean is_input = lilv_port_is_a (lv2plugin, port, input_class);
LilvNodes *lv2group = lilv_port_get (lv2plugin, port, group_pred);
if (lv2group) {
const gchar *uri = lilv_node_as_uri (lv2group);
if (g_hash_table_contains (port_groups, uri))
continue;
g_hash_table_add (port_groups, g_strdup (uri));
lilv_node_free (lv2group);
}
if (is_input)
num_sink_pads++;
else
num_src_pads++;
}
}
if (num_sink_pads == 0 && num_src_pads == 0) {
GST_FIXME ("plugin %s has no pads", type_name);
} else if (num_sink_pads == 0) {
if (num_src_pads != 1) {
GST_FIXME ("plugin %s is not a GstBaseSrc (num_src_pads: %d)",
type_name, num_src_pads);
goto next;
}
gst_lv2_source_register_element (plugin, type_name, (gpointer) lv2plugin);
} else if (num_src_pads == 0) {
GST_FIXME ("plugin %s is a sink element (num_sink_pads: %d"
" num_src_pads: %d)", type_name, num_sink_pads, num_src_pads);
} else {
if (num_sink_pads != 1 || num_src_pads != 1) {
GST_FIXME ("plugin %s is not a GstAudioFilter (num_sink_pads: %d"
" num_src_pads: %d)", type_name, num_sink_pads, num_src_pads);
goto next;
}
gst_lv2_filter_register_element (plugin, type_name, (gpointer) lv2plugin);
}
next:
g_free (type_name);
g_hash_table_unref (port_groups);
}
return TRUE;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (lv2_debug, "lv2",
GST_DEBUG_FG_GREEN | GST_DEBUG_BG_BLACK | GST_DEBUG_BOLD, "LV2");
world = lilv_world_new ();
lilv_world_load_all (world);
audio_class = lilv_new_uri (world, LILV_URI_AUDIO_PORT);
control_class = lilv_new_uri (world, LILV_URI_CONTROL_PORT);
input_class = lilv_new_uri (world, LILV_URI_INPUT_PORT);
output_class = lilv_new_uri (world, LILV_URI_OUTPUT_PORT);
#define NS_LV2 "http://lv2plug.in/ns/lv2core#"
#define NS_PG "http://lv2plug.in/ns/ext/port-groups#"
integer_prop = lilv_new_uri (world, NS_LV2 "integer");
toggled_prop = lilv_new_uri (world, NS_LV2 "toggled");
in_place_broken_pred = lilv_new_uri (world, NS_LV2 "inPlaceBroken");
group_pred = lilv_new_uri (world, LV2_PORT_GROUPS__group);
has_role_pred = lilv_new_uri (world, NS_PG "role");
/* FIXME Verify what should be used here */
lv2_symbol_pred = lilv_new_uri (world, LILV_NS_LV2 "symbol");
center_role = lilv_new_uri (world, LV2_PORT_GROUPS__center);
left_role = lilv_new_uri (world, LV2_PORT_GROUPS__left);
right_role = lilv_new_uri (world, LV2_PORT_GROUPS__right);
rear_center_role = lilv_new_uri (world, LV2_PORT_GROUPS__rearCenter);
rear_left_role = lilv_new_uri (world, LV2_PORT_GROUPS__rearLeft);
rear_right_role = lilv_new_uri (world, LV2_PORT_GROUPS__rearLeft);
lfe_role = lilv_new_uri (world, LV2_PORT_GROUPS__lowFrequencyEffects);
center_left_role = lilv_new_uri (world, LV2_PORT_GROUPS__centerLeft);
center_right_role = lilv_new_uri (world, LV2_PORT_GROUPS__centerRight);
side_left_role = lilv_new_uri (world, LV2_PORT_GROUPS__sideLeft);
side_right_role = lilv_new_uri (world, LV2_PORT_GROUPS__sideRight);
gst_plugin_add_dependency_simple (plugin,
"LV2_PATH", GST_LV2_DEFAULT_PATH, NULL, GST_PLUGIN_DEPENDENCY_FLAG_NONE);
descriptor_quark = g_quark_from_static_string ("lilv-plugin");
/* ensure GstAudioChannelPosition type is registered */
if (!gst_audio_channel_position_get_type ())
return FALSE;
if (!lv2_plugin_discover (plugin)) {
GST_WARNING ("no lv2 plugins found, check LV2_PATH");
}
/* we don't want to fail, even if there are no elements registered */
return TRUE;
}
#ifdef __GNUC__
__attribute__ ((destructor))
#endif
static void plugin_cleanup (GstPlugin * plugin)
{
lilv_node_free (audio_class);
lilv_node_free (control_class);
lilv_node_free (input_class);
lilv_node_free (output_class);
lilv_node_free (integer_prop);
lilv_node_free (toggled_prop);
lilv_node_free (in_place_broken_pred);
lilv_node_free (group_pred);
lilv_node_free (has_role_pred);
lilv_node_free (lv2_symbol_pred);
lilv_node_free (center_role);
lilv_node_free (left_role);
lilv_node_free (right_role);
lilv_node_free (rear_center_role);
lilv_node_free (rear_left_role);
lilv_node_free (rear_right_role);
lilv_node_free (lfe_role);
lilv_node_free (center_left_role);
lilv_node_free (center_right_role);
lilv_node_free (side_left_role);
lilv_node_free (side_right_role);
lilv_world_free (world);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
lv2,
"All LV2 plugins",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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