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LV2 preset support.

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This commit is contained in:
Dave Robillard 2009-08-17 17:06:40 -04:00 committed by Stefan Kost
parent a744f8136b
commit c95f59cd2d
2 changed files with 171 additions and 16 deletions
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169
ext/lv2/gstlv2.c
View file

@ -167,6 +167,13 @@ gst_lv2_build_positions (GstLV2Group * group)
return positions;
}
static gint
gst_lv2_compare_symbol (gconstpointer a, gconstpointer b, gpointer data)
{
return strcmp (slv2_value_as_string ((SLV2Value) a),
slv2_value_as_string ((SLV2Value) b));
}
static void
gst_lv2_base_init (gpointer g_class)
{
@ -176,13 +183,16 @@ gst_lv2_base_init (gpointer g_class)
GstElementDetails *details;
SLV2Plugin lv2plugin;
SLV2Value val;
SLV2Values values, sub_values;
SLV2Values values = NULL, sub_values = NULL;
SLV2Value prev = NULL;
GstLV2Group *group = NULL;
GstAudioChannelPosition position = GST_AUDIO_CHANNEL_POSITION_INVALID;
GstAudioChannelPosition mono_position = GST_AUDIO_CHANNEL_POSITION_FRONT_MONO;
GstAudioChannelPosition *positions = NULL;
guint j, in_pad_index = 0, out_pad_index = 0;
guint j, in_pad_index = 0, out_pad_index = 0, in_prop_index = 0;
gchar *klass_tags;
GTree *control_port_indices = g_tree_new_full (gst_lv2_compare_symbol,
NULL, NULL, free);
GST_DEBUG ("base_init %p", g_class);
@ -210,8 +220,17 @@ gst_lv2_base_init (gpointer g_class)
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);
struct _GstLV2Port desc;
desc.index = j;
desc.pad = 0;
desc.role = NULL;
desc.position = GST_AUDIO_CHANNEL_POSITION_INVALID;
/* we only care about audio port groups (for multi-channel) */
if (slv2_port_is_a (lv2plugin, port, audio_class))
values = slv2_port_get_value (lv2plugin, port, in_group_pred);
else
values = NULL;
if (slv2_values_size (values) > 0) {
/* port is part of a group */
@ -272,15 +291,22 @@ gst_lv2_base_init (gpointer g_class)
* 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)
if (is_input) {
g_array_append_val (klass->audio_in_ports, desc);
else
} else {
g_array_append_val (klass->audio_out_ports, desc);
}
} else if (slv2_port_is_a (lv2plugin, port, control_class)) {
if (is_input)
if (is_input) {
gint *prop_num = malloc (sizeof (gint));
desc.pad = in_prop_index++;
*prop_num = desc.pad;
g_tree_insert (control_port_indices, slv2_port_get_symbol (lv2plugin,
port), prop_num);
g_array_append_val (klass->control_in_ports, desc);
else
} else {
g_array_append_val (klass->control_out_ports, desc);
}
} else {
/* unknown port type */
continue;
@ -352,6 +378,59 @@ gst_lv2_base_init (gpointer g_class)
j, 1, &mono_position);
}
/* find presets */
values = slv2_plugin_query_sparql (lv2plugin,
"PREFIX pset: <http://lv2plug.in/ns/dev/presets#>\n"
"PREFIX dc: <http://dublincore.org/documents/dcmi-namespace/>\n"
"SELECT ?preset ?name ?sym ?val WHERE {\n"
" <> pset:hasPreset ?preset .\n"
" ?preset dc:title ?name ;\n"
" lv2:port ?port .\n"
" ?port lv2:symbol ?sym ;\n"
" pset:value ?val .\n" "}\n");
for (; !slv2_results_finished (values); slv2_results_next (values)) {
SLV2Value preset = slv2_results_get_binding_value (values, 0);
SLV2Value name = slv2_results_get_binding_value (values, 1);
SLV2Value sym = slv2_results_get_binding_value (values, 2);
SLV2Value val = slv2_results_get_binding_value (values, 3);
GstLV2Preset *p = NULL;
const gint *index = NULL;
GstLV2PresetValue preset_val;
if (!klass->presets)
klass->presets = g_array_new (FALSE, TRUE, sizeof (GstLV2Preset));
if (!slv2_value_equals (prev, preset)) {
struct _GstLV2Preset new_preset;
new_preset.uri = preset;
new_preset.name = name;
new_preset.values = NULL;
g_array_append_val (klass->presets, new_preset);
}
p = &g_array_index (klass->presets, GstLV2Preset, klass->presets->len - 1);
prev = p->uri;
/* we don't understand non-float port values */
if (!slv2_value_is_float (val)) {
continue;
}
/* look up port by symbol (we need the index) */
index = (gint *) g_tree_lookup (control_port_indices, sym);
if (!index) {
/* we don't know about this port, just ignore it */
continue;
}
preset_val.index = *index;
preset_val.value = slv2_value_as_float (val);
if (!p->values)
p->values = g_array_new (FALSE, TRUE, sizeof (GstLV2PresetValue));
g_array_append_val (p->values, preset_val);
}
g_tree_destroy (control_port_indices);
/* construct the element details struct */
details = g_new0 (GstElementDetails, 1);
val = slv2_plugin_get_name (lv2plugin);
@ -466,7 +545,8 @@ gst_lv2_class_init (GstLV2Class * klass, SLV2Plugin lv2plugin)
{
GObjectClass *gobject_class;
GstSignalProcessorClass *gsp_class;
gint i;
GParamSpec *preset_spec;
gint i, offset = 1;
GST_DEBUG ("class_init %p", klass);
@ -483,7 +563,22 @@ gst_lv2_class_init (GstLV2Class * klass, SLV2Plugin lv2plugin)
klass->plugin = lv2plugin;
/* register properties */
/* register preset property */
if (klass->presets) {
gint perms =
G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT |
GST_PARAM_CONTROLLABLE;
preset_spec =
g_param_spec_int ("preset", "preset", "preset", 0,
klass->presets->len - 1, 0, perms);
g_object_class_install_property (G_OBJECT_CLASS (klass), 1, preset_spec);
/* if there is a preset property, then port properties are offset by 2
* relative to lv2 port index (rather than 1) */
offset = 2;
}
/* register control port properties */
for (i = 0; i < gsp_class->num_control_in; i++) {
GParamSpec *p;
@ -491,8 +586,8 @@ gst_lv2_class_init (GstLV2Class * klass, SLV2Plugin lv2plugin)
p = gst_lv2_class_get_param_spec (klass,
g_array_index (klass->control_in_ports, GstLV2Port, i).index);
/* properties have an offset of 1 */
g_object_class_install_property (G_OBJECT_CLASS (klass), i + 1, p);
/* control properties have an offset of (offset) */
g_object_class_install_property (G_OBJECT_CLASS (klass), i + offset, p);
}
for (i = 0; i < gsp_class->num_control_out; i++) {
@ -501,9 +596,9 @@ gst_lv2_class_init (GstLV2Class * klass, SLV2Plugin lv2plugin)
p = gst_lv2_class_get_param_spec (klass,
g_array_index (klass->control_out_ports, GstLV2Port, i).index);
/* properties have an offset of 1, and we already added num_control_in */
/* control properties have an offset of (offset), and we already added num_control_in */
g_object_class_install_property (G_OBJECT_CLASS (klass),
gsp_class->num_control_in + i + 1, p);
gsp_class->num_control_in + i + offset, p);
}
}
@ -513,6 +608,7 @@ gst_lv2_init (GstLV2 * lv2, GstLV2Class * klass)
lv2->plugin = klass->plugin;
lv2->instance = NULL;
lv2->activated = FALSE;
lv2->current_preset = 0;
}
static void
@ -521,13 +617,44 @@ gst_lv2_set_property (GObject * object, guint prop_id, const GValue * value,
{
GstSignalProcessor *gsp;
GstSignalProcessorClass *gsp_class;
GstLV2 *lv2;
GstLV2Class *lv2_class;
gint i;
gsp = GST_SIGNAL_PROCESSOR (object);
gsp_class = GST_SIGNAL_PROCESSOR_GET_CLASS (object);
lv2 = (GstLV2 *) gsp;
lv2_class = (GstLV2Class *) gsp_class;
/* remember, properties have an offset of 1 */
/* remember, properties have an offset of 1, or 2 if there are presets */
prop_id--;
if (lv2_class->presets) {
if (prop_id == 0) {
GstLV2Preset *preset;
gint num = g_value_get_int (value);
if (num > lv2_class->presets->len) {
GST_WARNING ("Preset number out of range\n");
return;
}
preset = &g_array_index (lv2_class->presets, GstLV2Preset, num);
/* apply preset controls */
for (i = 0; i < preset->values->len; ++i) {
GstLV2PresetValue *preset_value =
&g_array_index (preset->values, GstLV2PresetValue, i);
GstLV2Port *desc =
&g_array_index (lv2_class->control_in_ports, GstLV2Port,
preset_value->index);
gsp->control_in[prop_id] = preset_value->value;
}
lv2->current_preset = num;
return;
} else {
prop_id--;
}
}
/* only input ports */
g_return_if_fail (prop_id < gsp_class->num_control_in);
@ -553,13 +680,25 @@ gst_lv2_get_property (GObject * object, guint prop_id, GValue * value,
{
GstSignalProcessor *gsp;
GstSignalProcessorClass *gsp_class;
GstLV2 *lv2;
GstLV2Class *lv2_class;
gfloat *controls;
gsp = GST_SIGNAL_PROCESSOR (object);
gsp_class = GST_SIGNAL_PROCESSOR_GET_CLASS (object);
lv2 = (GstLV2 *) gsp;
lv2_class = (GstLV2Class *) gsp_class;
/* remember, properties have an offset of 1 */
prop_id--;
if (lv2_class->presets != NULL) {
if (prop_id == 0) {
g_value_set_int (value, lv2->current_preset);
return;
} else {
prop_id--;
}
}
if (prop_id < gsp_class->num_control_in) {
controls = gsp->control_in;

18
ext/lv2/gstlv2.h
View file

@ -48,6 +48,8 @@ typedef struct _GstLV2 GstLV2;
typedef struct _GstLV2Class GstLV2Class;
typedef struct _GstLV2Group GstLV2Group;
typedef struct _GstLV2Port GstLV2Port;
typedef struct _GstLV2Preset GstLV2Preset;
typedef struct _GstLV2PresetValue GstLV2PresetValue;
struct _GstLV2 {
@ -57,6 +59,7 @@ struct _GstLV2 {
SLV2Instance instance;
gboolean activated;
gint current_preset;
};
struct _GstLV2Group {
@ -69,11 +72,23 @@ struct _GstLV2Group {
struct _GstLV2Port {
gint index; /**< LV2 port index (on LV2 plugin) */
gint pad; /**< Gst pad index (iff not part of a group) */
gint pad; /**< Gst pad (iff not part of a group) or property index */
SLV2Value role; /**< Channel position / port role */
GstAudioChannelPosition position; /**< Channel position */
};
struct _GstLV2PresetValue {
gint index; /**< LV2 port index */
gfloat value; /**< Port value */
};
struct _GstLV2Preset {
SLV2Value uri;
SLV2Value name;
GArray *values; /**< Array of GstLV2PresetValue */
};
struct _GstLV2Class {
GstSignalProcessorClass parent_class;
@ -86,6 +101,7 @@ struct _GstLV2Class {
GArray *control_in_ports; /**< Array of GstLV2Port */
GArray *control_out_ports; /**< Array of GstLV2Port */
GArray *presets; /**< Array of GstLV2Preset */
};