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/*
* NASPRO - The NASPRO Architecture for Sound PROcessing
* A collection of bridges to LV2
* DSSI bridge
*
* Copyright (C) 2007-2014 Stefano D'Angelo
*
* See the COPYING file for license conditions.
*/
#include "internal.h"
/* libdssialsacompat has this one commented out */
void snd_midi_event_init(snd_midi_event_t *dev);
/* Taken from ALSA */
#define MAX_MIDI_EVENT_BUF 256
#define MAX_MIDI_EVENTS 4096
typedef struct
{
LADSPA_Handle handle;
DSSI_Descriptor *descriptor;
LV2_URID urid_midi;
LV2_Atom_Sequence *atom_seq;
snd_midi_event_t *alsa_ev_parser;
snd_seq_event_t alsa_ev_buf[MAX_MIDI_EVENTS];
} instance_t;
static LV2_Handle
instantiate(const LV2_Descriptor *descriptor, double sample_rate,
const char *bundle_path, const LV2_Feature * const *features)
{
instance_t *ret;
DSSI_Descriptor *ddesc;
LV2_URID_Map *map;
size_t i;
ddesc = nabrit_plugin_get_opaque(
nabrit_plugin_from_descriptor(descriptor));
ret = malloc(sizeof(instance_t));
if (ret == NULL)
return NULL;
if (ddesc->run_synth != NULL)
{
map = NULL;
for (i = 0; features[i] != NULL; i++)
{
if (strcmp(features[i]->URI, LV2_URID__map) == 0)
map = features[i]->data;
}
ret->urid_midi = map->map(map->handle, LV2_MIDI__MidiEvent);
if (ret->urid_midi == 0)
{
free(ret);
return NULL;
}
if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &ret->alsa_ev_parser)
< 0)
{
free(ret);
return NULL;
}
snd_midi_event_init(ret->alsa_ev_parser);
}
else
ret->alsa_ev_parser = NULL;
ret->descriptor = ddesc;
ret->handle = ddesc->LADSPA_Plugin->instantiate(ddesc->LADSPA_Plugin,
sample_rate);
if (ret->handle == NULL)
{
free(ret);
return NULL;
}
return (LV2_Handle)ret;
}
static void
connect_port(LV2_Handle instance, uint32_t port, void *data_location)
{
instance_t *i;
/* This is needed to avoid a little incompatibility beetween LADSPA and
LV2. LADSPA's connect_port() does not specify whether data_location
is valid at the time it is being run, while LV2 mandates the plugin
not to trust the memory location indicated by the pointer at the time
connect_port() is run. */
if (data_location == NULL)
return;
i = (instance_t *)instance;
if (port == i->descriptor->LADSPA_Plugin->PortCount)
i->atom_seq = (LV2_Atom_Sequence *)data_location;
else
i->descriptor->LADSPA_Plugin->connect_port(i->handle, port,
data_location);
}
static void
activate(LV2_Handle instance)
{
instance_t *i;
i = (instance_t *)instance;
i->descriptor->LADSPA_Plugin->activate(i->handle);
}
static void
run(LV2_Handle instance, uint32_t sample_count)
{
instance_t *i;
i = (instance_t *)instance;
i->descriptor->LADSPA_Plugin->run(i->handle, sample_count);
}
static void
deactivate(LV2_Handle instance)
{
instance_t *i;
i = (instance_t *)instance;
i->descriptor->LADSPA_Plugin->deactivate(i->handle);
}
static void
cleanup(LV2_Handle instance)
{
instance_t *i;
i = (instance_t *)instance;
if (i->alsa_ev_parser != NULL)
snd_midi_event_free(i->alsa_ev_parser);
i->descriptor->LADSPA_Plugin->cleanup(i->handle);
free(i);
}
NACORE_PRIVATE LV2_Descriptor stub_desc =
{
/* .URI = */ NULL,
/* .instantiate = */ instantiate,
/* .connect_port = */ connect_port,
/* .activate = */ activate,
/* .run = */ run,
/* .deactivate = */ deactivate,
/* .cleanup = */ cleanup,
/* .extension_data = */ NULL
};
static int
cmp_stamp(const void *v1, const void *v2)
{
snd_seq_event_t *e1, *e2;
e1 = (snd_seq_event_t *)v1;
e2 = (snd_seq_event_t *)v2;
return ((e1->time.tick < e2->time.tick)
? -1 : ((e1->time.tick > e2->time.tick) ? 1 : 0));
}
NACORE_PRIVATE void
run_synth(LV2_Handle instance, uint32_t sample_count)
{
instance_t *i;
snd_seq_event_t *alsa_ev;
snd_seq_event_t alsa_tmp_ev;
unsigned char *data;
unsigned long count;
i = (instance_t *)instance;
/* Convert MIDI events to ALSA Sequencer events */
alsa_ev = i->alsa_ev_buf;
count = 0;
LV2_ATOM_SEQUENCE_FOREACH(i->atom_seq, ev)
{
if (ev->body.type != i->urid_midi)
continue;
data = LV2_ATOM_BODY(&ev->body);
if (snd_midi_event_encode(i->alsa_ev_parser, data,
ev->body.size, &alsa_tmp_ev) < 0)
{
snd_midi_event_reset_encode(i->alsa_ev_parser);
continue;
}
if ((alsa_tmp_ev.type == SND_SEQ_EVENT_CONTROLLER)
|| (alsa_tmp_ev.type == SND_SEQ_EVENT_PGMCHANGE))
continue;
alsa_tmp_ev.time.tick = ev->time.frames;
*alsa_ev = alsa_tmp_ev;
alsa_ev++;
count++;
}
/* Order events by timestamp */
if (count > 1)
qsort(i->alsa_ev_buf, count, sizeof(snd_seq_event_t),
cmp_stamp);
i->descriptor->run_synth(i->handle, sample_count, i->alsa_ev_buf,
count);
}
API const LV2_Descriptor *
lv2_descriptor(uint32_t index)
{
return nabrit_bridge_get_descriptor(bridge, index);
}
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