gstreamer/ext/lv2/gstlv2.c
Stefan Sauer e9a2c4f1e1 lv2: support for loading presets
Detect if plugins can do presets. Lazily read a list of presets and add support
for loading.
2016-07-04 21:18:28 +02:00

349 lines
11 KiB
C

/* 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>
#include "lv2/lv2plug.in/ns/ext/event/event.h"
#include "lv2/lv2plug.in/ns/ext/presets/presets.h"
#include "lv2/lv2plug.in/ns/ext/state/state.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"
GstStructure *lv2_meta_all = NULL;
static void
lv2_plugin_register_element (GstPlugin * plugin, GstStructure * lv2_meta)
{
guint audio_in, audio_out;
gst_structure_get_uint (lv2_meta, "audio-in", &audio_in);
gst_structure_get_uint (lv2_meta, "audio-out", &audio_out);
if (audio_in == 0) {
gst_lv2_source_register_element (plugin, lv2_meta);
} else {
gst_lv2_filter_register_element (plugin, lv2_meta);
}
}
static void
lv2_count_ports (const LilvPlugin * lv2plugin, guint * audio_in,
guint * audio_out, guint * control)
{
GHashTable *port_groups = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, NULL);
guint i;
*audio_in = *audio_out = *control = 0;
for (i = 0; i < lilv_plugin_get_num_ports (lv2plugin); i++) {
const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, i);
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)
(*audio_in)++;
else
(*audio_out)++;
} else if (lilv_port_is_a (lv2plugin, port, control_class) ||
lilv_port_is_a (lv2plugin, port, cv_class)) {
(*control)++;
}
}
g_hash_table_unref (port_groups);
}
/* search the plugin path */
static gboolean
lv2_plugin_discover (GstPlugin * plugin)
{
guint audio_in, audio_out, control;
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)) {
GstStructure *lv2_meta = NULL;
GValue value = { 0, };
const LilvPlugin *lv2plugin = lilv_plugins_get (plugins, i);
const gchar *plugin_uri, *p;
gchar *type_name;
gboolean can_do_presets;
plugin_uri = lilv_node_as_uri (lilv_plugin_get_uri (lv2plugin));
/* check if we support the required host features */
if (!gst_lv2_check_required_features (lv2plugin)) {
GST_FIXME ("lv2 plugin %s needs host features", plugin_uri);
continue;
}
/* 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 this has any audio ports */
lv2_count_ports (lv2plugin, &audio_in, &audio_out, &control);
if (audio_in == 0 && audio_out == 0) {
GST_FIXME ("plugin %s has no audio pads", type_name);
goto next;
} else if (audio_in == 0) {
if (audio_out != 1) {
GST_FIXME ("plugin %s is not a GstBaseSrc (num_src_pads: %d)",
type_name, audio_out);
goto next;
}
} else if (audio_out == 0) {
GST_FIXME ("plugin %s is a sink element (num_sink_pads: %d"
" num_src_pads: %d)", type_name, audio_in, audio_out);
goto next;
} else {
if (audio_in != 1 || audio_out != 1) {
GST_FIXME ("plugin %s is not a GstAudioFilter (num_sink_pads: %d"
" num_src_pads: %d)", type_name, audio_in, audio_out);
goto next;
}
}
/* check supported extensions */
can_do_presets = lilv_plugin_has_extension_data (lv2plugin, state_iface)
|| lilv_plugin_has_feature (lv2plugin, state_uri)
|| (control > 0);
GST_INFO ("plugin %s can%s do presets", type_name,
(can_do_presets ? "" : "'t"));
lv2_meta = gst_structure_new ("lv2",
"element-uri", G_TYPE_STRING, plugin_uri,
"element-type-name", G_TYPE_STRING, type_name,
"audio-in", G_TYPE_UINT, audio_in,
"audio-out", G_TYPE_UINT, audio_out,
"can-do-presets", G_TYPE_BOOLEAN, can_do_presets, NULL);
g_value_init (&value, GST_TYPE_STRUCTURE);
g_value_set_boxed (&value, lv2_meta);
gst_structure_set_value (lv2_meta_all, type_name, &value);
g_value_unset (&value);
// don't free type_name
continue;
next:
g_free (type_name);
}
return TRUE;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
gboolean res = FALSE;
gint n = 0;
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);
gst_lv2_host_init ();
/* have been added after lilv-0.22.0, which is the last release */
#ifndef LILV_URI_ATOM_PORT
#define LILV_URI_ATOM_PORT "http://lv2plug.in/ns/ext/atom#AtomPort"
#endif
#ifndef LILV_URI_CV_PORT
#define LILV_URI_CV_PORT "http://lv2plug.in/ns/lv2core#CVPort"
#endif
atom_class = lilv_new_uri (world, LILV_URI_ATOM_PORT);
audio_class = lilv_new_uri (world, LILV_URI_AUDIO_PORT);
control_class = lilv_new_uri (world, LILV_URI_CONTROL_PORT);
cv_class = lilv_new_uri (world, LILV_URI_CV_PORT);
event_class = lilv_new_uri (world, LILV_URI_EVENT_PORT);
input_class = lilv_new_uri (world, LILV_URI_INPUT_PORT);
output_class = lilv_new_uri (world, LILV_URI_OUTPUT_PORT);
preset_class = lilv_new_uri (world, LV2_PRESETS__Preset);
state_iface = lilv_new_uri (world, LV2_STATE__interface);
state_uri = lilv_new_uri (world, LV2_STATE_URI);
integer_prop = lilv_new_uri (world, LV2_CORE__integer);
toggled_prop = lilv_new_uri (world, LV2_CORE__toggled);
designation_pred = lilv_new_uri (world, LV2_CORE__designation);
in_place_broken_pred = lilv_new_uri (world, LV2_CORE__inPlaceBroken);
optional_pred = lilv_new_uri (world, LV2_CORE__optionalFeature);
group_pred = lilv_new_uri (world, LV2_PORT_GROUPS__group);
supports_event_pred = lilv_new_uri (world, LV2_EVENT__supportsEvent);
label_pred = lilv_new_uri (world, LILV_NS_RDFS "label");
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);
/* ensure GstAudioChannelPosition type is registered */
if (!gst_audio_channel_position_get_type ())
return FALSE;
lv2_meta_all = (GstStructure *) gst_plugin_get_cache_data (plugin);
if (lv2_meta_all) {
n = gst_structure_n_fields (lv2_meta_all);
}
GST_INFO_OBJECT (plugin, "%d entries in cache", n);
if (!n) {
lv2_meta_all = gst_structure_new_empty ("lv2");
if ((res = lv2_plugin_discover (plugin))) {
n = gst_structure_n_fields (lv2_meta_all);
GST_INFO_OBJECT (plugin, "%d entries after scanning", n);
gst_plugin_set_cache_data (plugin, lv2_meta_all);
}
} else {
res = TRUE;
}
if (n) {
gint i;
const gchar *name;
const GValue *value;
GST_INFO_OBJECT (plugin, "register types");
for (i = 0; i < n; i++) {
name = gst_structure_nth_field_name (lv2_meta_all, i);
value = gst_structure_get_value (lv2_meta_all, name);
if (G_VALUE_TYPE (value) == GST_TYPE_STRUCTURE) {
GstStructure *lv2_meta = g_value_get_boxed (value);
lv2_plugin_register_element (plugin, lv2_meta);
}
}
}
if (!res) {
GST_WARNING_OBJECT (plugin, "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 (atom_class);
lilv_node_free (audio_class);
lilv_node_free (control_class);
lilv_node_free (cv_class);
lilv_node_free (event_class);
lilv_node_free (input_class);
lilv_node_free (output_class);
lilv_node_free (preset_class);
lilv_node_free (state_iface);
lilv_node_free (state_uri);
lilv_node_free (integer_prop);
lilv_node_free (toggled_prop);
lilv_node_free (designation_pred);
lilv_node_free (in_place_broken_pred);
lilv_node_free (optional_pred);
lilv_node_free (group_pred);
lilv_node_free (supports_event_pred);
lilv_node_free (label_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)