diff options
Diffstat (limited to 'hosts/lv2_jack_host.c')
| -rw-r--r-- | hosts/lv2_jack_host.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/hosts/lv2_jack_host.c b/hosts/lv2_jack_host.c new file mode 100644 index 0000000..e5e51a3 --- /dev/null +++ b/hosts/lv2_jack_host.c @@ -0,0 +1,338 @@ +/* jack_host - SLV2 Jack Host + * Copyright (C) 2007 Dave Robillard <drobilla.net> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program 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 General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <slv2/slv2.h> +#include <jack/jack.h> + +#define WITH_MIDI 1 +#define MIDI_BUFFER_SIZE 1024 + +#ifdef WITH_MIDI +#include <jack/midiport.h> +#include "lv2-miditype.h" +#include "lv2-midifunctions.h" +#endif // WITH_MIDI + +struct Port { + enum Direction { INPUT, OUTPUT} direction; + enum Type { UNKNOWN, FLOAT, MIDI } type; + + jack_port_t* jack_port; /**< For audio and MIDI ports, otherwise NULL */ + float control; /**< For control ports, otherwise 0.0f */ + LV2_MIDI* midi_buffer; /**< For midi ports, otherwise NULL */ +}; + + +/** This program's data */ +struct JackHost { + jack_client_t* jack_client; /**< Jack client */ + SLV2Plugin* plugin; /**< Plugin "class" (actually just a few strings) */ + SLV2Instance* instance; /**< Plugin "instance" (loaded shared lib) */ + uint32_t num_ports; /**< Size of the two following arrays: */ + struct Port* ports; /** Port array of size num_ports */ +}; + + +void die(const char* msg); +void create_port(struct JackHost* host, uint32_t port_index); +int jack_process_cb(jack_nframes_t nframes, void* data); +void list_plugins(SLV2List list); + + +int +main(int argc, char** argv) +{ + struct JackHost host; + host.jack_client = NULL; + host.num_ports = 0; + host.ports = NULL; + + /* Find all installed plugins */ + SLV2List plugins = slv2_list_new(); + slv2_list_load_all(plugins); + //slv2_list_load_bundle(plugins, "http://www.scs.carleton.ca/~drobilla/files/Amp-swh.lv2"); + + /* Find the plugin to run */ + const char* plugin_uri = (argc == 2) ? argv[1] : NULL; + + if (!plugin_uri) { + fprintf(stderr, "\nYou must specify a plugin URI to load.\n"); + fprintf(stderr, "\nKnown plugins:\n\n"); + list_plugins(plugins); + return EXIT_FAILURE; + } + + printf("URI:\t%s\n", plugin_uri); + host.plugin = slv2_list_get_plugin_by_uri(plugins, plugin_uri); + + if (!host.plugin) { + fprintf(stderr, "Failed to find plugin %s.\n", plugin_uri); + slv2_list_free(plugins); + return EXIT_FAILURE; + } + + /* Get the plugin's name */ + char* name = slv2_plugin_get_name(host.plugin); + printf("Name:\t%s\n", name); + + /* Connect to JACK (with plugin name as client name) */ + host.jack_client = jack_client_open(name, JackNullOption, NULL); + free(name); + if (!host.jack_client) + die("Failed to connect to JACK."); + else + printf("Connected to JACK.\n"); + + /* Instantiate the plugin */ + host.instance = slv2_plugin_instantiate( + host.plugin, jack_get_sample_rate(host.jack_client), NULL); + if (!host.instance) + die("Failed to instantiate plugin.\n"); + else + printf("Succesfully instantiated plugin.\n"); + + jack_set_process_callback(host.jack_client, &jack_process_cb, (void*)(&host)); + + /* Create ports */ + host.num_ports = slv2_plugin_get_num_ports(host.plugin); + host.ports = calloc((size_t)host.num_ports, sizeof(struct Port)); + + for (uint32_t i=0; i < host.num_ports; ++i) + create_port(&host, i); + + /* Activate plugin and JACK */ + slv2_instance_activate(host.instance); + jack_activate(host.jack_client); + + /* Run */ + printf("Press enter to quit: "); + getc(stdin); + printf("\n"); + + /* Deactivate plugin and JACK */ + slv2_instance_free(host.instance); + slv2_list_free(plugins); + + printf("Shutting down JACK.\n"); + for (unsigned long i=0; i < host.num_ports; ++i) { + if (host.ports[i].jack_port != NULL) { + jack_port_unregister(host.jack_client, host.ports[i].jack_port); + host.ports[i].jack_port = NULL; + } + if (host.ports[i].midi_buffer != NULL) { + lv2midi_free(host.ports[i].midi_buffer); + } + } + jack_client_close(host.jack_client); + + return 0; +} + + +/** Abort and exit on error */ +void +die(const char* msg) +{ + fprintf(stderr, "%s\n", msg); + exit(EXIT_FAILURE); +} + + +/** Creates a port and connects the plugin instance to it's data location. + * + * For audio ports, creates a jack port and connects plugin port to buffer. + * + * For control ports, sets controls array to default value and connects plugin + * port to that element. + */ +void +create_port(struct JackHost* host, + uint32_t port_index) +{ + //struct Port* port = (Port*)malloc(sizeof(Port)); + struct Port* const port = &host->ports[port_index]; + + port->type = UNKNOWN; + port->jack_port = NULL; + port->control = 0.0f; + port->midi_buffer = NULL; + + slv2_instance_connect_port(host->instance, port_index, NULL); + + char* type_str = slv2_port_get_data_type(host->plugin, port_index); + if (!strcmp(type_str, SLV2_DATA_TYPE_FLOAT)) + port->type = FLOAT; + else if (!strcmp(type_str, SLV2_DATA_TYPE_MIDI)) + port->type = MIDI; + + /* Get the port symbol (label) for console printing */ + char* symbol = slv2_port_get_symbol(host->plugin, port_index); + + /* Get the 'class' (not data type) of the port (control input, audio output, etc) */ + enum SLV2PortClass class = slv2_port_get_class(host->plugin, port_index); + + if (port->type == FLOAT) { + + /* Connect the port based on it's 'class' */ + switch (class) { + case SLV2_CONTROL_RATE_INPUT: + port->direction = INPUT; + port->control = slv2_port_get_default_value(host->plugin, port_index); + slv2_instance_connect_port(host->instance, port_index, &port->control); + printf("Set %s to %f\n", symbol, host->ports[port_index].control); + break; + case SLV2_CONTROL_RATE_OUTPUT: + port->direction = OUTPUT; + slv2_instance_connect_port(host->instance, port_index, &port->control); + break; + case SLV2_AUDIO_RATE_INPUT: + port->direction = INPUT; + port->jack_port = jack_port_register(host->jack_client, + symbol, JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0); + break; + case SLV2_AUDIO_RATE_OUTPUT: + port->direction = OUTPUT; + port->jack_port = jack_port_register(host->jack_client, + symbol, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0); + break; + default: + fprintf(stderr, "ERROR: Unknown port class\n"); + } + + } else if (port->type == MIDI) { + + if (class == SLV2_CONTROL_RATE_INPUT) { + port->direction = INPUT; + port->jack_port = jack_port_register(host->jack_client, + symbol, JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0); + port->midi_buffer = lv2midi_new(MIDI_BUFFER_SIZE); + slv2_instance_connect_port(host->instance, port_index, port->midi_buffer); + } else if (class == SLV2_CONTROL_RATE_OUTPUT) { + port->direction = OUTPUT; + port->jack_port = jack_port_register(host->jack_client, + symbol, JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0); + port->midi_buffer = lv2midi_new(MIDI_BUFFER_SIZE); + slv2_instance_connect_port(host->instance, port_index, port->midi_buffer); + } else { + fprintf(stderr, "ERROR: Audio rate MIDI port?? Ignoring.\n"); + } + + } else { + + fprintf(stderr, "Unrecognized data type %s for port %s, ignored.\n", + type_str, symbol); + fprintf(stderr, " %s\n", + SLV2_DATA_TYPE_MIDI); + + } + + free(symbol); + free(type_str); +} + + +/** Jack process callback. */ +int +jack_process_cb(jack_nframes_t nframes, void* data) +{ + struct JackHost* const host = (struct JackHost*)data; + + /* Connect inputs */ + for (uint32_t p=0; p < host->num_ports; ++p) { + if (!host->ports[p].jack_port) + continue; + + if (host->ports[p].type == FLOAT) { + slv2_instance_connect_port(host->instance, p, + jack_port_get_buffer(host->ports[p].jack_port, nframes)); + } else if (host->ports[p].type == MIDI) { + + void* jack_buffer = jack_port_get_buffer(host->ports[p].jack_port, nframes); + + LV2_MIDIState state; + lv2midi_reset_state(&state, host->ports[p].midi_buffer, nframes); + lv2midi_reset_buffer(state.midi); + + if (host->ports[p].direction == INPUT) { + jack_midi_event_t ev; + + const jack_nframes_t event_count + = jack_midi_get_event_count(jack_buffer, nframes); + + for (jack_nframes_t e=0; e < event_count; ++e) { + + jack_midi_event_get(&ev, jack_buffer, e, nframes); + + state.midi = host->ports[p].midi_buffer; + lv2midi_put_event(&state, (double)ev.time, ev.size, ev.buffer); + } + } + } + } + + + /* Run plugin for this cycle */ + slv2_instance_run(host->instance, nframes); + + + /* Deliver output */ + for (uint32_t p=0; p < host->num_ports; ++p) { + if (host->ports[p].jack_port + && host->ports[p].type == MIDI + && host->ports[p].direction == OUTPUT) { + + void* jack_buffer = jack_port_get_buffer(host->ports[p].jack_port, nframes); + + jack_midi_clear_buffer(jack_buffer, nframes); + + LV2_MIDIState state; + lv2midi_reset_state(&state, host->ports[p].midi_buffer, nframes); + + double timestamp = 0.0f; + uint32_t size = 0; + unsigned char* data = NULL; + + const uint32_t event_count = state.midi->event_count; + + for (uint32_t i=0; i < event_count; ++i) { + lv2midi_get_event(&state, ×tamp, &size, &data); + + jack_midi_event_write(jack_buffer, + (jack_nframes_t)timestamp, data, size, nframes); + + lv2midi_increment(&state); + } + + } + } + + return 0; +} + + +void +list_plugins(SLV2List list) +{ + for (size_t i=0; i < slv2_list_get_length(list); ++i) { + const SLV2Plugin* const p = slv2_list_get_plugin_by_index(list, i); + printf("%s\n", slv2_plugin_get_uri(p)); + } +} |