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gstreamer/ext/lv2/gstlv2.c

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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>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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 <math.h>
#include <glib.h>
#include <gst/audio/audio.h>
#include <gst/controller/gstcontroller.h>
#include <gst/audio/multichannel.h>
#include "gstlv2.h"
#include <slv2/slv2.h>
#define GST_LV2_DEFAULT_PATH \
"/usr/lib/lv2" G_SEARCHPATH_SEPARATOR_S \
"/usr/local/lib/lv2" G_SEARCHPATH_SEPARATOR_S \
LIBDIR "/lv2"
static void gst_lv2_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_lv2_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean gst_lv2_setup (GstSignalProcessor * sigproc, GstCaps * caps);
static gboolean gst_lv2_start (GstSignalProcessor * sigproc);
static void gst_lv2_stop (GstSignalProcessor * sigproc);
static void gst_lv2_cleanup (GstSignalProcessor * sigproc);
static void gst_lv2_process (GstSignalProcessor * sigproc, guint nframes);
static SLV2World world;
static SLV2Value audio_class;
static SLV2Value control_class;
static SLV2Value input_class;
static SLV2Value output_class;
static SLV2Value integer_prop;
static SLV2Value toggled_prop;
static SLV2Value in_place_broken_pred;
static SLV2Value in_group_pred;
static SLV2Value has_role_pred;
static SLV2Value lv2_symbol_pred;
static SLV2Value center_role;
static SLV2Value left_role;
static SLV2Value right_role;
static SLV2Value rear_center_role;
static SLV2Value rear_left_role;
static SLV2Value rear_right_role;
static SLV2Value lfe_role;
static SLV2Value center_left_role;
static SLV2Value center_right_role;
static SLV2Value side_left_role;
static SLV2Value side_right_role;
static GstSignalProcessorClass *parent_class;
static GstPlugin *gst_lv2_plugin;
GST_DEBUG_CATEGORY_STATIC (lv2_debug);
#define GST_CAT_DEFAULT lv2_debug
static GQuark descriptor_quark = 0;
/* Convert an LV2 port role to a Gst channel positon
* WARNING: If the group has only a single port,
* GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER will be returned for pg:centerRole
* (which is used by LV2 for mono groups), but this is not correct. In this
* case the value must be changed to GST_AUDIO_CHANNEL_POSITION_FRONT_MONO
* (this can't be done by this function because this information isn't known
* at the time it is used).
*/
static GstAudioChannelPosition
gst_lv2_role_to_position (SLV2Value role)
{
/* Front. Mono and left/right are mututally exclusive */
if (slv2_value_equals (role, center_role)) {
return GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER;
} else if (slv2_value_equals (role, left_role)) {
return GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
} else if (slv2_value_equals (role, right_role)) {
return GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
/* Rear. Left/right and center are mututally exclusive */
} else if (slv2_value_equals (role, rear_center_role)) {
return GST_AUDIO_CHANNEL_POSITION_REAR_CENTER;
} else if (slv2_value_equals (role, rear_left_role)) {
return GST_AUDIO_CHANNEL_POSITION_REAR_LEFT;
} else if (slv2_value_equals (role, rear_right_role)) {
return GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT;
/* Subwoofer/low-frequency-effects */
} else if (slv2_value_equals (role, lfe_role)) {
return GST_AUDIO_CHANNEL_POSITION_LFE;
/* Center front speakers. Center and left/right_of_center
* are mutually exclusive */
} else if (slv2_value_equals (role, center_left_role)) {
return GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
} else if (slv2_value_equals (role, center_right_role)) {
return GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
/* sides */
} else if (slv2_value_equals (role, side_left_role)) {
return GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT;
} else if (slv2_value_equals (role, side_right_role)) {
return GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT;
}
return GST_AUDIO_CHANNEL_POSITION_INVALID;
}
/* Find and return the group @a uri in @a groups, or NULL if not found */
static GstLV2Group *
gst_lv2_class_find_group (GArray * groups, SLV2Value uri)
{
int i = 0;
for (; i < groups->len; ++i)
if (slv2_value_equals (g_array_index (groups, GstLV2Group, i).uri, uri))
return &g_array_index (groups, GstLV2Group, i);
return NULL;
}
static GstAudioChannelPosition *
gst_lv2_build_positions (GstLV2Group * group)
{
GstAudioChannelPosition *positions = NULL;
/* don't do anything for mono */
if (group->ports->len > 1) {
gint i;
positions = g_new (GstAudioChannelPosition, group->ports->len);
for (i = 0; i < group->ports->len; ++i)
positions[i] = g_array_index (group->ports, GstLV2Port, i).position;
}
return positions;
}
static void
gst_lv2_base_init (gpointer g_class)
{
GstLV2Class *klass = (GstLV2Class *) g_class;
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstSignalProcessorClass *gsp_class = GST_SIGNAL_PROCESSOR_CLASS (g_class);
SLV2Plugin lv2plugin;
SLV2Value val;
SLV2Values values, sub_values;
GstLV2Group *group = NULL;
GstAudioChannelPosition position = GST_AUDIO_CHANNEL_POSITION_INVALID;
guint j, in_pad_index = 0, out_pad_index = 0;
const gchar *klass_tags;
gchar *longname, *author;
lv2plugin = (SLV2Plugin) g_type_get_qdata (G_OBJECT_CLASS_TYPE (klass),
descriptor_quark);
g_assert (lv2plugin);
GST_DEBUG ("base_init %p, plugin %s", g_class,
slv2_value_as_string (slv2_plugin_get_uri (lv2plugin)));
gsp_class->num_group_in = 0;
gsp_class->num_group_out = 0;
gsp_class->num_audio_in = 0;
gsp_class->num_audio_out = 0;
gsp_class->num_control_in = 0;
gsp_class->num_control_out = 0;
klass->in_groups = g_array_new (FALSE, TRUE, sizeof (GstLV2Group));
klass->out_groups = g_array_new (FALSE, TRUE, sizeof (GstLV2Group));
klass->audio_in_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
klass->audio_out_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
klass->control_in_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
klass->control_out_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
/* find ports and groups */
for (j = 0; j < slv2_plugin_get_num_ports (lv2plugin); j++) {
const SLV2Port port = slv2_plugin_get_port_by_index (lv2plugin, j);
const gboolean is_input = slv2_port_is_a (lv2plugin, port, input_class);
gboolean in_group = FALSE;
struct _GstLV2Port desc = { j, 0, };
values = slv2_port_get_value (lv2plugin, port, in_group_pred);
if (slv2_values_size (values) > 0) {
/* port is part of a group */
SLV2Value group_uri = slv2_values_get_at (values, 0);
GArray *groups = is_input ? klass->in_groups : klass->out_groups;
GstLV2Group *group = gst_lv2_class_find_group (groups, group_uri);
in_group = TRUE;
if (group == NULL) {
GstLV2Group g;
g.uri = slv2_value_duplicate (group_uri);
g.pad = is_input ? in_pad_index++ : out_pad_index++;
g.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
g.has_roles = TRUE;
g.symbol = NULL;
sub_values = slv2_plugin_get_value_for_subject (lv2plugin, group_uri,
lv2_symbol_pred);
/* symbol is mandatory */
if (slv2_values_size (sub_values) > 0) {
g.symbol = slv2_value_duplicate (slv2_values_get_at (sub_values, 0));
if (!gst_element_class_get_pad_template (element_class,
slv2_value_as_string (g.symbol))) {
g_array_append_val (groups, g);
group = &g_array_index (groups, GstLV2Group, groups->len - 1);
assert (group);
assert (slv2_value_equals (group->uri, group_uri));
} else {
GST_WARNING ("plugin %s has duplicate group symbol '%s'",
slv2_value_as_string (slv2_plugin_get_uri (lv2plugin)),
slv2_value_as_string (g.symbol));
in_group = FALSE;
}
} else {
GST_WARNING ("plugin %s has illegal group with no symbol",
slv2_value_as_string (slv2_plugin_get_uri (lv2plugin)));
in_group = FALSE;
}
}
if (in_group) {
position = GST_AUDIO_CHANNEL_POSITION_INVALID;
sub_values = slv2_port_get_value (lv2plugin, port, has_role_pred);
if (slv2_values_size (sub_values) > 0) {
SLV2Value role = slv2_values_get_at (sub_values, 0);
position = gst_lv2_role_to_position (role);
}
slv2_values_free (sub_values);
if (position != GST_AUDIO_CHANNEL_POSITION_INVALID) {
desc.position = position;
g_array_append_val (group->ports, desc);
} else {
in_group = FALSE;
}
}
}
if (!in_group) {
/* 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 (slv2_port_is_a (lv2plugin, port, audio_class)) {
desc.pad = is_input ? in_pad_index++ : out_pad_index++;
if (is_input)
g_array_append_val (klass->audio_in_ports, desc);
else
g_array_append_val (klass->audio_out_ports, desc);
} else if (slv2_port_is_a (lv2plugin, port, control_class)) {
if (is_input)
g_array_append_val (klass->control_in_ports, desc);
else
g_array_append_val (klass->control_out_ports, desc);
} else {
/* unknown port type */
GST_INFO ("unhandled port %d", j);
continue;
}
}
slv2_values_free (values);
}
gsp_class->num_group_in = klass->in_groups->len;
gsp_class->num_group_out = klass->out_groups->len;
gsp_class->num_audio_in = klass->audio_in_ports->len;
gsp_class->num_audio_out = klass->audio_out_ports->len;
gsp_class->num_control_in = klass->control_in_ports->len;
gsp_class->num_control_out = klass->control_out_ports->len;
/* add input group pad templates */
for (j = 0; j < gsp_class->num_group_in; ++j) {
group = &g_array_index (klass->in_groups, GstLV2Group, j);
gst_signal_processor_class_add_pad_template (gsp_class,
slv2_value_as_string (group->symbol), GST_PAD_SINK, j,
group->ports->len);
}
/* add output group pad templates */
for (j = 0; j < gsp_class->num_group_out; ++j) {
group = &g_array_index (klass->out_groups, GstLV2Group, j);
gst_signal_processor_class_add_pad_template (gsp_class,
slv2_value_as_string (group->symbol), GST_PAD_SRC, j,
group->ports->len);
}
/* add non-grouped input port pad templates */
for (j = 0; j < gsp_class->num_audio_in; ++j) {
struct _GstLV2Port *desc =
&g_array_index (klass->audio_in_ports, GstLV2Port, j);
SLV2Port port = slv2_plugin_get_port_by_index (lv2plugin, desc->index);
const gchar *name =
slv2_value_as_string (slv2_port_get_symbol (lv2plugin, port));
gst_signal_processor_class_add_pad_template (gsp_class, name, GST_PAD_SINK,
j, 1);
}
/* add non-grouped output port pad templates */
for (j = 0; j < gsp_class->num_audio_out; ++j) {
struct _GstLV2Port *desc =
&g_array_index (klass->audio_out_ports, GstLV2Port, j);
SLV2Port port = slv2_plugin_get_port_by_index (lv2plugin, desc->index);
const gchar *name =
slv2_value_as_string (slv2_port_get_symbol (lv2plugin, port));
gst_signal_processor_class_add_pad_template (gsp_class, name, GST_PAD_SRC,
j, 1);
}
val = slv2_plugin_get_name (lv2plugin);
if (val) {
longname = g_strdup (slv2_value_as_string (val));
slv2_value_free (val);
} else {
longname = g_strdup ("no description available");
}
val = slv2_plugin_get_author_name (lv2plugin);
if (val) {
author = g_strdup (slv2_value_as_string (val));
slv2_value_free (val);
} else {
author = g_strdup ("no author available");
}
if (gsp_class->num_audio_in == 0)
klass_tags = "Source/Audio/LV2";
else if (gsp_class->num_audio_out == 0) {
if (gsp_class->num_control_out == 0)
klass_tags = "Sink/Audio/LV2";
else
klass_tags = "Sink/Analyzer/Audio/LV2";
} else
klass_tags = "Filter/Effect/Audio/LV2";
GST_INFO ("tags : %s", klass_tags);
gst_element_class_set_details_simple (element_class, longname,
klass_tags, longname, author);
g_free (longname);
g_free (author);
if (!slv2_plugin_has_feature (lv2plugin, in_place_broken_pred))
GST_SIGNAL_PROCESSOR_CLASS_SET_CAN_PROCESS_IN_PLACE (klass);
klass->plugin = lv2plugin;
}
static gchar *
gst_lv2_class_get_param_name (GstLV2Class * klass, SLV2Port port)
{
SLV2Plugin lv2plugin = klass->plugin;
gchar *ret;
ret = g_strdup (slv2_value_as_string (slv2_port_get_symbol (lv2plugin,
port)));
/* 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 (G_OBJECT_CLASS (klass), ret)) {
gint n = 1;
gchar *nret = g_strdup_printf ("%s-%d", ret, n++);
while (g_object_class_find_property (G_OBJECT_CLASS (klass), 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,
slv2_value_as_string (slv2_port_get_symbol (lv2plugin, port)));
return ret;
}
static gchar *
gst_lv2_class_get_param_nick (GstLV2Class * klass, SLV2Port port)
{
SLV2Plugin lv2plugin = klass->plugin;
return g_strdup (slv2_value_as_string (slv2_port_get_name (lv2plugin, port)));
}
static GParamSpec *
gst_lv2_class_get_param_spec (GstLV2Class * klass, gint portnum)
{
SLV2Plugin lv2plugin = klass->plugin;
SLV2Port port = slv2_plugin_get_port_by_index (lv2plugin, portnum);
SLV2Value lv2def, lv2min, lv2max;
GParamSpec *ret;
gchar *name, *nick;
gint perms;
gfloat lower = 0.0f, upper = 1.0f, def = 0.0f;
nick = gst_lv2_class_get_param_nick (klass, port);
name = gst_lv2_class_get_param_name (klass, port);
GST_DEBUG ("%s trying port %s : %s",
slv2_value_as_string (slv2_plugin_get_uri (lv2plugin)), name, nick);
perms = G_PARAM_READABLE;
if (slv2_port_is_a (lv2plugin, port, input_class))
perms |= G_PARAM_WRITABLE | G_PARAM_CONSTRUCT;
if (slv2_port_is_a (lv2plugin, port, control_class))
perms |= GST_PARAM_CONTROLLABLE;
if (slv2_port_has_property (lv2plugin, port, toggled_prop)) {
ret = g_param_spec_boolean (name, nick, nick, FALSE, perms);
goto done;
}
slv2_port_get_range (lv2plugin, port, &lv2def, &lv2min, &lv2max);
if (lv2def)
def = slv2_value_as_float (lv2def);
if (lv2min)
lower = slv2_value_as_float (lv2min);
if (lv2max)
upper = slv2_value_as_float (lv2max);
slv2_value_free (lv2def);
slv2_value_free (lv2min);
slv2_value_free (lv2max);
if (def < lower) {
GST_WARNING ("%s has lower bound %f > default %f",
slv2_value_as_string (slv2_plugin_get_uri (lv2plugin)), lower, def);
lower = def;
}
if (def > upper) {
GST_WARNING ("%s has upper bound %f < default %f",
slv2_value_as_string (slv2_plugin_get_uri (lv2plugin)), upper, def);
upper = def;
}
if (slv2_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:
g_free (name);
g_free (nick);
return ret;
}
static void
gst_lv2_class_init (GstLV2Class * klass, SLV2Plugin lv2plugin)
{
GObjectClass *gobject_class;
GstSignalProcessorClass *gsp_class;
GParamSpec *p;
gint i, ix;
GST_DEBUG ("class_init %p", klass);
gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_lv2_set_property;
gobject_class->get_property = gst_lv2_get_property;
gsp_class = GST_SIGNAL_PROCESSOR_CLASS (klass);
gsp_class->setup = gst_lv2_setup;
gsp_class->start = gst_lv2_start;
gsp_class->stop = gst_lv2_stop;
gsp_class->cleanup = gst_lv2_cleanup;
gsp_class->process = gst_lv2_process;
klass->plugin = lv2plugin;
/* properties have an offset of 1 */
ix = 1;
/* register properties */
for (i = 0; i < gsp_class->num_control_in; i++, ix++) {
p = gst_lv2_class_get_param_spec (klass,
g_array_index (klass->control_in_ports, GstLV2Port, i).index);
g_object_class_install_property (gobject_class, ix, p);
}
for (i = 0; i < gsp_class->num_control_out; i++, ix++) {
p = gst_lv2_class_get_param_spec (klass,
g_array_index (klass->control_out_ports, GstLV2Port, i).index);
g_object_class_install_property (gobject_class, ix, p);
}
}
static void
gst_lv2_init (GstLV2 * lv2, GstLV2Class * klass)
{
lv2->plugin = klass->plugin;
lv2->instance = NULL;
lv2->activated = FALSE;
}
static void
gst_lv2_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstSignalProcessor *gsp;
GstSignalProcessorClass *gsp_class;
gsp = GST_SIGNAL_PROCESSOR (object);
gsp_class = GST_SIGNAL_PROCESSOR_GET_CLASS (object);
/* remember, properties have an offset of 1 */
prop_id--;
/* only input ports */
g_return_if_fail (prop_id < gsp_class->num_control_in);
/* now see what type it is */
switch (pspec->value_type) {
case G_TYPE_BOOLEAN:
gsp->control_in[prop_id] = g_value_get_boolean (value) ? 0.0f : 1.0f;
break;
case G_TYPE_INT:
gsp->control_in[prop_id] = g_value_get_int (value);
break;
case G_TYPE_FLOAT:
gsp->control_in[prop_id] = g_value_get_float (value);
break;
default:
g_assert_not_reached ();
}
}
static void
gst_lv2_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstSignalProcessor *gsp;
GstSignalProcessorClass *gsp_class;
gfloat *controls;
gsp = GST_SIGNAL_PROCESSOR (object);
gsp_class = GST_SIGNAL_PROCESSOR_GET_CLASS (object);
/* remember, properties have an offset of 1 */
prop_id--;
if (prop_id < gsp_class->num_control_in) {
controls = gsp->control_in;
} else if (prop_id < gsp_class->num_control_in + gsp_class->num_control_out) {
controls = gsp->control_out;
prop_id -= gsp_class->num_control_in;
} else {
g_return_if_reached ();
}
/* now see what type it is */
switch (pspec->value_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;
default:
g_return_if_reached ();
}
}
static gboolean
gst_lv2_setup (GstSignalProcessor * gsp, GstCaps * caps)
{
GstLV2 *lv2;
GstLV2Class *oclass;
GstSignalProcessorClass *gsp_class;
GstStructure *s;
gint i;
GstLV2Group *group = NULL;
GstAudioChannelPosition *positions = NULL;
GstPad *pad;
gsp_class = GST_SIGNAL_PROCESSOR_GET_CLASS (gsp);
lv2 = (GstLV2 *) gsp;
oclass = (GstLV2Class *) gsp_class;
g_return_val_if_fail (lv2->activated == FALSE, FALSE);
GST_DEBUG_OBJECT (lv2, "instantiating the plugin at %d Hz", gsp->sample_rate);
if (!(lv2->instance =
slv2_plugin_instantiate (oclass->plugin, gsp->sample_rate, NULL)))
goto no_instance;
/* connect the control ports */
for (i = 0; i < gsp_class->num_control_in; i++)
slv2_instance_connect_port (lv2->instance,
g_array_index (oclass->control_in_ports, GstLV2Port, i).index,
&(gsp->control_in[i]));
for (i = 0; i < gsp_class->num_control_out; i++)
slv2_instance_connect_port (lv2->instance,
g_array_index (oclass->control_out_ports, GstLV2Port, i).index,
&(gsp->control_out[i]));
/* set input group pad audio channel position */
for (i = 0; i < gsp_class->num_group_in; ++i) {
group = &g_array_index (oclass->in_groups, GstLV2Group, i);
if (group->has_roles) {
if ((positions = gst_lv2_build_positions (group))) {
if ((pad = gst_element_get_static_pad (GST_ELEMENT (gsp),
slv2_value_as_string (group->symbol)))) {
GST_INFO_OBJECT (lv2, "set audio channel positions on sink pad %s",
slv2_value_as_string (group->symbol));
s = gst_caps_get_structure (caps, 0);
gst_audio_set_channel_positions (s, positions);
gst_object_unref (pad);
}
g_free (positions);
positions = NULL;
}
}
}
/* set output group pad audio channel position */
for (i = 0; i < gsp_class->num_group_out; ++i) {
group = &g_array_index (oclass->out_groups, GstLV2Group, i);
if (group->has_roles) {
if ((positions = gst_lv2_build_positions (group))) {
if ((pad = gst_element_get_static_pad (GST_ELEMENT (gsp),
slv2_value_as_string (group->symbol)))) {
GST_INFO_OBJECT (lv2, "set audio channel positions on src pad %s",
slv2_value_as_string (group->symbol));
s = gst_caps_get_structure (caps, 0);
gst_audio_set_channel_positions (s, positions);
gst_object_unref (pad);
}
g_free (positions);
positions = NULL;
}
}
}
return TRUE;
no_instance:
{
GST_WARNING_OBJECT (gsp, "could not create instance");
return FALSE;
}
}
static gboolean
gst_lv2_start (GstSignalProcessor * gsp)
{
GstLV2 *lv2 = (GstLV2 *) gsp;
g_return_val_if_fail (lv2->activated == FALSE, FALSE);
g_return_val_if_fail (lv2->instance != NULL, FALSE);
GST_DEBUG_OBJECT (lv2, "activating");
slv2_instance_activate (lv2->instance);
lv2->activated = TRUE;
return TRUE;
}
static void
gst_lv2_stop (GstSignalProcessor * gsp)
{
GstLV2 *lv2 = (GstLV2 *) gsp;
g_return_if_fail (lv2->activated == TRUE);
g_return_if_fail (lv2->instance != NULL);
GST_DEBUG_OBJECT (lv2, "deactivating");
slv2_instance_deactivate (lv2->instance);
lv2->activated = FALSE;
}
static void
gst_lv2_cleanup (GstSignalProcessor * gsp)
{
GstLV2 *lv2 = (GstLV2 *) gsp;
g_return_if_fail (lv2->activated == FALSE);
g_return_if_fail (lv2->instance != NULL);
GST_DEBUG_OBJECT (lv2, "cleaning up");
slv2_instance_free (lv2->instance);
lv2->instance = NULL;
}
static void
gst_lv2_process (GstSignalProcessor * gsp, guint nframes)
{
GstSignalProcessorClass *gsp_class;
GstLV2 *lv2;
GstLV2Class *lv2_class;
GstLV2Group *lv2_group;
GstLV2Port *lv2_port;
GstSignalProcessorGroup *gst_group;
guint i, j;
gsp_class = GST_SIGNAL_PROCESSOR_GET_CLASS (gsp);
lv2 = (GstLV2 *) gsp;
lv2_class = (GstLV2Class *) gsp_class;
/* multi channel inputs */
for (i = 0; i < gsp_class->num_group_in; i++) {
lv2_group = &g_array_index (lv2_class->in_groups, GstLV2Group, i);
gst_group = &gsp->group_in[i];
for (j = 0; j < lv2_group->ports->len; ++j) {
lv2_port = &g_array_index (lv2_group->ports, GstLV2Port, j);
slv2_instance_connect_port (lv2->instance, lv2_port->index,
gst_group->buffer + (j * nframes));
}
}
/* mono inputs */
for (i = 0; i < gsp_class->num_audio_in; i++) {
lv2_port = &g_array_index (lv2_class->audio_in_ports, GstLV2Port, i);
slv2_instance_connect_port (lv2->instance, lv2_port->index,
gsp->audio_in[i]);
}
/* multi channel outputs */
for (i = 0; i < gsp_class->num_group_out; i++) {
lv2_group = &g_array_index (lv2_class->out_groups, GstLV2Group, i);
gst_group = &gsp->group_out[i];
for (j = 0; j < lv2_group->ports->len; ++j) {
lv2_port = &g_array_index (lv2_group->ports, GstLV2Port, j);
slv2_instance_connect_port (lv2->instance, lv2_port->index,
gst_group->buffer + (j * nframes));
}
}
/* mono outputs */
for (i = 0; i < gsp_class->num_audio_out; i++) {
lv2_port = &g_array_index (lv2_class->audio_out_ports, GstLV2Port, i);
slv2_instance_connect_port (lv2->instance, lv2_port->index,
gsp->audio_out[i]);
}
slv2_instance_run (lv2->instance, nframes);
}
/* search the plugin path
*/
static gboolean
lv2_plugin_discover (void)
{
guint i, j;
SLV2Plugins plugins = slv2_world_get_all_plugins (world);
for (i = 0; i < slv2_plugins_size (plugins); ++i) {
SLV2Plugin lv2plugin = slv2_plugins_get_at (plugins, i);
gint num_audio_ports = 0;
const gchar *plugin_uri, *p;
gchar *type_name;
GTypeInfo typeinfo = {
sizeof (GstLV2Class),
(GBaseInitFunc) gst_lv2_base_init,
NULL,
(GClassInitFunc) gst_lv2_class_init,
NULL,
lv2plugin,
sizeof (GstLV2),
0,
(GInstanceInitFunc) gst_lv2_init,
};
GType type;
plugin_uri = slv2_value_as_uri (slv2_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 this has any audio ports */
for (j = 0; j < slv2_plugin_get_num_ports (lv2plugin); j++) {
const SLV2Port port = slv2_plugin_get_port_by_index (lv2plugin, j);
if (slv2_port_is_a (lv2plugin, port, audio_class)) {
num_audio_ports++;
}
}
if (!num_audio_ports) {
GST_INFO ("plugin %s has no audio ports", type_name);
goto next;
}
/* create the type */
type =
g_type_register_static (GST_TYPE_SIGNAL_PROCESSOR, type_name, &typeinfo,
0);
/* FIXME: not needed anymore when we can add pad templates, etc in class_init
* as class_data contains the LADSPA_Descriptor too */
g_type_set_qdata (type, descriptor_quark, (gpointer) lv2plugin);
if (!gst_element_register (gst_lv2_plugin, type_name, GST_RANK_NONE, type))
goto next;
next:
g_free (type_name);
}
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 = slv2_world_new ();
slv2_world_load_all (world);
audio_class = slv2_value_new_uri (world, SLV2_PORT_CLASS_AUDIO);
control_class = slv2_value_new_uri (world, SLV2_PORT_CLASS_CONTROL);
input_class = slv2_value_new_uri (world, SLV2_PORT_CLASS_INPUT);
output_class = slv2_value_new_uri (world, SLV2_PORT_CLASS_OUTPUT);
#define NS_LV2 "http://lv2plug.in/ns/lv2core#"
#define NS_PG "http://lv2plug.in/ns/ext/port-groups"
integer_prop = slv2_value_new_uri (world, NS_LV2 "integer");
toggled_prop = slv2_value_new_uri (world, NS_LV2 "toggled");
in_place_broken_pred = slv2_value_new_uri (world, NS_LV2 "inPlaceBroken");
in_group_pred = slv2_value_new_uri (world, NS_PG "inGroup");
has_role_pred = slv2_value_new_uri (world, NS_PG "role");
lv2_symbol_pred = slv2_value_new_string (world, NS_LV2 "symbol");
center_role = slv2_value_new_uri (world, NS_PG "centerChannel");
left_role = slv2_value_new_uri (world, NS_PG "leftChannel");
right_role = slv2_value_new_uri (world, NS_PG "rightChannel");
rear_center_role = slv2_value_new_uri (world, NS_PG "rearCenterChannel");
rear_left_role = slv2_value_new_uri (world, NS_PG "rearLeftChannel");
rear_right_role = slv2_value_new_uri (world, NS_PG "rearRightChannel");
lfe_role = slv2_value_new_uri (world, NS_PG "lfeChannel");
center_left_role = slv2_value_new_uri (world, NS_PG "centerLeftChannel");
center_right_role = slv2_value_new_uri (world, NS_PG "centerRightChannel");
side_left_role = slv2_value_new_uri (world, NS_PG "sideLeftChannel");
side_right_role = slv2_value_new_uri (world, NS_PG "sideRightChannel");
/* initialize gst controller library */
gst_controller_init (NULL, NULL);
gst_plugin_add_dependency_simple (plugin,
"LV2_PATH", GST_LV2_DEFAULT_PATH, NULL, GST_PLUGIN_DEPENDENCY_FLAG_NONE);
parent_class = g_type_class_ref (GST_TYPE_SIGNAL_PROCESSOR);
gst_lv2_plugin = plugin;
descriptor_quark = g_quark_from_static_string ("slv2-plugin");
/* ensure GstAudioChannelPosition type is registered */
if (!gst_audio_channel_position_get_type ())
return FALSE;
if (!lv2_plugin_discover ()) {
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)
{
slv2_value_free (audio_class);
slv2_value_free (control_class);
slv2_value_free (input_class);
slv2_value_free (output_class);
slv2_value_free (integer_prop);
slv2_value_free (toggled_prop);
slv2_value_free (in_place_broken_pred);
slv2_value_free (in_group_pred);
slv2_value_free (has_role_pred);
slv2_value_free (lv2_symbol_pred);
slv2_value_free (center_role);
slv2_value_free (left_role);
slv2_value_free (right_role);
slv2_value_free (rear_center_role);
slv2_value_free (rear_left_role);
slv2_value_free (rear_right_role);
slv2_value_free (lfe_role);
slv2_value_free (center_left_role);
slv2_value_free (center_right_role);
slv2_value_free (side_left_role);
slv2_value_free (side_right_role);
slv2_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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