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|
#define BACKEND_NAME "jack"
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include "jack.h"
#include <jack/midiport.h>
#include <jack/metadata.h>
#define JACKEY_SIGNAL_TYPE "http://jackaudio.org/metadata/signal-type"
#ifdef __APPLE__
#ifndef PTHREAD_MUTEX_ADAPTIVE_NP
#define PTHREAD_MUTEX_ADAPTIVE_NP PTHREAD_MUTEX_DEFAULT
#endif
#endif
//FIXME pitchbend range is somewhat oob
static struct /*_mmjack_backend_cfg*/ {
unsigned verbosity;
volatile sig_atomic_t jack_shutdown;
} config = {
.verbosity = 1,
.jack_shutdown = 0
};
MM_PLUGIN_API int init(){
backend mmjack = {
.name = BACKEND_NAME,
.conf = mmjack_configure,
.create = mmjack_instance,
.conf_instance = mmjack_configure_instance,
.channel = mmjack_channel,
.handle = mmjack_set,
.process = mmjack_handle,
.start = mmjack_start,
.shutdown = mmjack_shutdown
};
if(sizeof(mmjack_channel_ident) != sizeof(uint64_t)){
LOG("Channel identification union out of bounds");
return 1;
}
//register backend
if(mm_backend_register(mmjack)){
LOG("Failed to register backend");
return 1;
}
return 0;
}
static void mmjack_message_print(const char* msg){
LOGPF("JACK message: %s", msg);
}
static void mmjack_message_ignore(const char* msg){
}
static int mmjack_midiqueue_append(mmjack_port* port, mmjack_channel_ident ident, uint16_t value){
//append events
if(port->queue_len == port->queue_alloc){
//extend the queue
port->queue = realloc(port->queue, (port->queue_len + JACK_MIDIQUEUE_CHUNK) * sizeof(mmjack_midiqueue));
if(!port->queue){
LOG("Failed to allocate memory");
return 1;
}
port->queue_alloc += JACK_MIDIQUEUE_CHUNK;
}
port->queue[port->queue_len].ident.label = ident.label;
port->queue[port->queue_len].raw = value;
port->queue_len++;
DBGPF("Appended event to queue for %s, now at %" PRIsize_t " entries", port->name, port->queue_len);
return 0;
}
static int mmjack_process_midi(instance* inst, mmjack_port* port, size_t nframes, size_t* mark){
void* buffer = jack_port_get_buffer(port->port, nframes);
jack_nframes_t event_count = jack_midi_get_event_count(buffer);
jack_midi_event_t event;
jack_midi_data_t* event_data;
mmjack_channel_ident ident;
size_t u;
uint16_t value;
if(port->input){
if(event_count){
DBGPF("Reading %u MIDI events from port %s", event_count, port->name);
for(u = 0; u < event_count; u++){
ident.label = 0;
//read midi data from stream
jack_midi_event_get(&event, buffer, u);
//ident.fields.port set on output in mmjack_handle_midi
ident.fields.sub_channel = event.buffer[0] & 0x0F;
ident.fields.sub_type = event.buffer[0] & 0xF0;
ident.fields.sub_control = event.buffer[1];
value = event.buffer[2];
if(ident.fields.sub_type == 0x80){
ident.fields.sub_type = midi_note;
value = 0;
}
else if(ident.fields.sub_type == midi_pitchbend){
ident.fields.sub_control = 0;
value = event.buffer[1] | (event.buffer[2] << 7);
}
else if(ident.fields.sub_type == midi_aftertouch){
ident.fields.sub_control = 0;
value = event.buffer[1];
}
//append midi data
mmjack_midiqueue_append(port, ident, value);
}
port->mark = 1;
*mark = 1;
}
}
else{
//clear buffer
jack_midi_clear_buffer(buffer);
for(u = 0; u < port->queue_len; u++){
//build midi event
ident.label = port->queue[u].ident.label;
event_data = jack_midi_event_reserve(buffer, u, (ident.fields.sub_type == midi_aftertouch) ? 2 : 3);
if(!event_data){
LOG("Failed to reserve MIDI stream data");
return 1;
}
event_data[0] = ident.fields.sub_channel | ident.fields.sub_type;
if(ident.fields.sub_type == midi_pitchbend){
event_data[1] = port->queue[u].raw & 0x7F;
event_data[2] = (port->queue[u].raw >> 7) & 0x7F;
}
else if(ident.fields.sub_type == midi_aftertouch){
event_data[1] = port->queue[u].raw & 0x7F;
}
else{
event_data[1] = ident.fields.sub_control;
event_data[2] = port->queue[u].raw & 0x7F;
}
}
if(port->queue_len){
DBGPF("Wrote %" PRIsize_t " MIDI events to port %s", port->queue_len, port->name);
}
port->queue_len = 0;
}
return 0;
}
static int mmjack_process_cv(instance* inst, mmjack_port* port, size_t nframes, size_t* mark){
jack_default_audio_sample_t* audio_buffer = jack_port_get_buffer(port->port, nframes);
size_t u;
if(port->input){
//read updated data into the local buffer
//FIXME maybe we don't want to always use the first sample...
if((double) audio_buffer[0] != port->last){
port->last = audio_buffer[0];
port->mark = 1;
*mark = 1;
}
}
else{
for(u = 0; u < nframes; u++){
audio_buffer[u] = port->last;
}
}
return 0;
}
static int mmjack_process(jack_nframes_t nframes, void* instp){
instance* inst = (instance*) instp;
mmjack_instance_data* data = (mmjack_instance_data*) inst->impl;
size_t p, mark = 0;
int rv = 0;
//DBGPF("jack callback for %d frames on %s", nframes, inst->name);
for(p = 0; p < data->ports; p++){
pthread_mutex_lock(&data->port[p].lock);
switch(data->port[p].type){
case port_midi:
//DBGPF("Handling MIDI port %s.%s", inst->name, data->port[p].name);
rv |= mmjack_process_midi(inst, data->port + p, nframes, &mark);
break;
case port_cv:
//DBGPF("Handling CV port %s.%s", inst->name, data->port[p].name);
rv |= mmjack_process_cv(inst, data->port + p, nframes, &mark);
break;
default:
LOG("Unhandled port type in processing callback");
pthread_mutex_unlock(&data->port[p].lock);
return 1;
}
pthread_mutex_unlock(&data->port[p].lock);
}
//notify the main thread
if(mark){
DBGPF("Notifying handler thread for instance %s", inst->name);
send(data->fd, "c", 1, 0);
}
return rv;
}
static void mmjack_server_shutdown(void* inst){
LOG("Server shut down");
config.jack_shutdown = 1;
}
static int mmjack_configure(char* option, char* value){
if(!strcmp(option, "debug")){
if(!strcmp(value, "on")){
config.verbosity |= 2;
return 0;
}
config.verbosity &= ~2;
return 0;
}
if(!strcmp(option, "errors")){
if(!strcmp(value, "on")){
config.verbosity |= 1;
return 0;
}
config.verbosity &= ~1;
return 0;
}
LOGPF("Unknown backend option %s", option);
return 1;
}
static int mmjack_parse_portconfig(mmjack_port* port, char* spec){
char* token = NULL;
for(token = strtok(spec, " "); token; token = strtok(NULL, " ")){
if(!strcmp(token, "in")){
port->input = 1;
}
else if(!strcmp(token, "out")){
port->input = 0;
}
else if(!strcmp(token, "midi")){
port->type = port_midi;
}
else if(!strcmp(token, "osc")){
port->type = port_osc;
}
else if(!strcmp(token, "cv")){
port->type = port_cv;
}
else if(!strcmp(token, "max")){
token = strtok(NULL, " ");
if(!token){
LOGPF("Port %s configuration missing argument", port->name);
return 1;
}
port->max = strtod(token, NULL);
}
else if(!strcmp(token, "min")){
token = strtok(NULL, " ");
if(!token){
LOGPF("Port %s configuration missing argument", port->name);
return 1;
}
port->min = strtod(token, NULL);
}
else{
LOGPF("Unknown channel configuration token %s on port %s", token, port->name);
return 1;
}
}
if(port->type == port_none){
LOGPF("Channel %s assigned no port type", port->name);
return 1;
}
return 0;
}
static int mmjack_configure_instance(instance* inst, char* option, char* value){
mmjack_instance_data* data = (mmjack_instance_data*) inst->impl;
size_t p;
if(!strcmp(option, "name")){
if(data->client_name){
free(data->client_name);
}
data->client_name = strdup(value);
return 0;
}
else if(!strcmp(option, "server")){
if(data->server_name){
free(data->server_name);
}
data->server_name = strdup(value);
return 0;
}
//register new port, first check for unique name
for(p = 0; p < data->ports; p++){
if(!strcmp(data->port[p].name, option)){
LOGPF("Instance %s has duplicate port %s", inst->name, option);
return 1;
}
}
if(strchr(option, '.')){
LOGPF("Invalid channel spec %s.%s", inst->name, option);
}
//add port to registry
//TODO for OSC ports we need to configure subchannels for each message
data->port = realloc(data->port, (data->ports + 1) * sizeof(mmjack_port));
if(!data->port){
LOG("Failed to allocate memory");
return 1;
}
data->port[data->ports].name = strdup(option);
if(!data->port[data->ports].name){
LOG("Failed to allocate memory");
return 1;
}
if(mmjack_parse_portconfig(data->port + p, value)){
return 1;
}
data->ports++;
return 0;
}
static int mmjack_instance(instance* inst){
inst->impl = calloc(1, sizeof(mmjack_instance_data));
if(!inst->impl){
LOG("Failed to allocate memory");
return 1;
}
return 0;
}
static int mmjack_parse_midispec(mmjack_channel_ident* ident, char* spec){
char* next_token = NULL;
if(!strncmp(spec, "ch", 2)){
next_token = spec + 2;
if(!strncmp(spec, "channel", 7)){
next_token = spec + 7;
}
}
if(!next_token){
LOGPF("Invalid MIDI spec %s", spec);
return 1;
}
ident->fields.sub_channel = strtoul(next_token, &next_token, 10);
if(ident->fields.sub_channel > 15){
LOGPF("Invalid MIDI spec %s, channel out of range", spec);
return 1;
}
if(*next_token != '.'){
LOGPF("Invalid MIDI spec %s", spec);
return 1;
}
next_token++;
if(!strncmp(next_token, "cc", 2)){
ident->fields.sub_type = midi_cc;
next_token += 2;
}
else if(!strncmp(next_token, "note", 4)){
ident->fields.sub_type = midi_note;
next_token += 4;
}
else if(!strncmp(next_token, "pressure", 8)){
ident->fields.sub_type = midi_pressure;
next_token += 8;
}
else if(!strncmp(next_token, "pitch", 5)){
ident->fields.sub_type = midi_pitchbend;
}
else if(!strncmp(next_token, "aftertouch", 10)){
ident->fields.sub_type = midi_aftertouch;
}
else{
LOGPF("Unknown MIDI control type in spec %s", spec);
return 1;
}
ident->fields.sub_control = strtoul(next_token, NULL, 10);
if(ident->fields.sub_type == midi_none
|| ident->fields.sub_control > 127){
LOGPF("Invalid MIDI spec %s", spec);
return 1;
}
return 0;
}
static channel* mmjack_channel(instance* inst, char* spec, uint8_t flags){
mmjack_instance_data* data = (mmjack_instance_data*) inst->impl;
mmjack_channel_ident ident = {
.label = 0
};
size_t u;
for(u = 0; u < data->ports; u++){
if(!strncmp(spec, data->port[u].name, strlen(data->port[u].name))
&& (spec[strlen(data->port[u].name)] == '.' || spec[strlen(data->port[u].name)] == 0)){
ident.fields.port = u;
break;
}
}
if(u == data->ports){
LOGPF("Tried to map unknown port %s.%s", inst->name, spec);
return NULL;
}
if(data->port[u].type == port_midi){
//parse midi subspec
if(!spec[strlen(data->port[u].name)]
|| mmjack_parse_midispec(&ident, spec + strlen(data->port[u].name) + 1)){
return NULL;
}
}
else if(data->port[u].type == port_osc){
//TODO parse osc subspec
}
return mm_channel(inst, ident.label, 1);
}
static int mmjack_set(instance* inst, size_t num, channel** c, channel_value* v){
mmjack_instance_data* data = (mmjack_instance_data*) inst->impl;
mmjack_channel_ident ident = {
.label = 0
};
size_t u;
double range;
uint16_t value;
for(u = 0; u < num; u++){
ident.label = c[u]->ident;
if(data->port[ident.fields.port].input){
LOGPF("Port %s.%s is an input port, no output is possible", inst->name, data->port[ident.fields.port].name);
continue;
}
range = data->port[ident.fields.port].max - data->port[ident.fields.port].min;
pthread_mutex_lock(&data->port[ident.fields.port].lock);
switch(data->port[ident.fields.port].type){
case port_cv:
//scale value to given range
data->port[ident.fields.port].last = (range * v[u].normalised) + data->port[ident.fields.port].min;
DBGPF("CV port %s updated to %f", data->port[ident.fields.port].name, data->port[ident.fields.port].last);
break;
case port_midi:
value = v[u].normalised * 127.0;
if(ident.fields.sub_type == midi_pitchbend){
value = ((uint16_t)(v[u].normalised * 16384.0));
}
if(mmjack_midiqueue_append(data->port + ident.fields.port, ident, value)){
pthread_mutex_unlock(&data->port[ident.fields.port].lock);
return 1;
}
break;
default:
LOGPF("No handler implemented for port type %s.%s", inst->name, data->port[ident.fields.port].name);
break;
}
pthread_mutex_unlock(&data->port[ident.fields.port].lock);
}
return 0;
}
static void mmjack_handle_midi(instance* inst, size_t index, mmjack_port* port){
size_t u;
channel* chan = NULL;
channel_value val;
for(u = 0; u < port->queue_len; u++){
port->queue[u].ident.fields.port = index;
chan = mm_channel(inst, port->queue[u].ident.label, 0);
if(chan){
if(port->queue[u].ident.fields.sub_type == midi_pitchbend){
val.normalised = ((double)port->queue[u].raw) / 16384.0;
}
else{
val.normalised = ((double)port->queue[u].raw) / 127.0;
}
DBGPF("Pushing MIDI channel %d type %02X control %d value %f raw %d label %" PRIu64,
port->queue[u].ident.fields.sub_channel,
port->queue[u].ident.fields.sub_type,
port->queue[u].ident.fields.sub_control,
val.normalised,
port->queue[u].raw,
port->queue[u].ident.label);
if(mm_channel_event(chan, val)){
LOGPF("Failed to push MIDI event to core on port %s.%s", inst->name, port->name);
}
}
}
if(port->queue_len){
DBGPF("Pushed %" PRIsize_t " MIDI events to core for port %s.%s", port->queue_len, inst->name, port->name);
}
port->queue_len = 0;
}
static void mmjack_handle_cv(instance* inst, size_t index, mmjack_port* port){
mmjack_channel_ident ident = {
.fields.port = index
};
double range;
channel_value val;
channel* chan = mm_channel(inst, ident.label, 0);
if(!chan){
//this might happen if a channel is registered but not mapped
DBGPF("Failed to match CV channel %s.%s to core channel", inst->name, port->name);
return;
}
//normalize value
range = port->max - port->min;
val.normalised = port->last - port->min;
val.normalised /= range;
val.normalised = clamp(val.normalised, 1.0, 0.0);
DBGPF("Pushing CV channel %s value %f raw %f min %f max %f", port->name, val.normalised, port->last, port->min, port->max);
if(mm_channel_event(chan, val)){
LOGPF("Failed to push CV event to core for %s.%s", inst->name, port->name);
}
}
static int mmjack_handle(size_t num, managed_fd* fds){
size_t u, p;
instance* inst = NULL;
mmjack_instance_data* data = NULL;
ssize_t bytes;
uint8_t recv_buf[1024];
for(u = 0; u < num; u++){
inst = (instance*) fds[u].impl;
data = (mmjack_instance_data*) inst->impl;
bytes = recv(fds[u].fd, recv_buf, sizeof(recv_buf), 0);
if(bytes < 0){
LOGPF("Failed to receive on feedback socket for instance %s", inst->name);
return 1;
}
for(p = 0; p < data->ports; p++){
if(data->port[p].input && data->port[p].mark){
pthread_mutex_lock(&data->port[p].lock);
switch(data->port[p].type){
case port_cv:
mmjack_handle_cv(inst, p, data->port + p);
break;
case port_midi:
mmjack_handle_midi(inst, p, data->port + p);
break;
default:
LOGPF("Output handler not implemented for unknown channel type on %s.%s", inst->name, data->port[p].name);
break;
}
data->port[p].mark = 0;
pthread_mutex_unlock(&data->port[p].lock);
}
}
}
if(config.jack_shutdown){
LOG("Server disconnected");
return 1;
}
return 0;
}
static int mmjack_start(size_t n, instance** inst){
int rv = 1, feedback_fd[2];
size_t u, p;
pthread_mutexattr_t mutex_attr;
mmjack_instance_data* data = NULL;
jack_status_t error;
//set jack logging functions
jack_set_error_function(mmjack_message_ignore);
if(config.verbosity & 1){
jack_set_error_function(mmjack_message_print);
}
jack_set_info_function(mmjack_message_ignore);
if(config.verbosity & 2){
jack_set_info_function(mmjack_message_print);
}
//prepare mutex attributes because the initializer macro for adaptive mutexes is a GNU extension...
if(pthread_mutexattr_init(&mutex_attr)
|| pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_ADAPTIVE_NP)){
LOG("Failed to initialize mutex attributes");
goto bail;
}
for(u = 0; u < n; u++){
data = (mmjack_instance_data*) inst[u]->impl;
//connect to the jack server
data->client = jack_client_open(data->client_name ? data->client_name : JACK_DEFAULT_CLIENT_NAME,
JackServerName | JackNoStartServer,
&error,
data->server_name ? data->server_name : JACK_DEFAULT_SERVER_NAME);
if(!data->client){
//TODO pretty-print failures
LOGPF("Failed to connect to server, return status %u", error);
goto bail;
}
//set up the feedback fd
if(socketpair(AF_LOCAL, SOCK_DGRAM, 0, feedback_fd)){
LOG("Failed to create feedback socket pair");
goto bail;
}
data->fd = feedback_fd[0];
if(mm_manage_fd(feedback_fd[1], BACKEND_NAME, 1, inst[u])){
LOG("Failed to register feedback FD with core");
goto bail;
}
//connect jack callbacks
jack_set_process_callback(data->client, mmjack_process, inst[u]);
jack_on_shutdown(data->client, mmjack_server_shutdown, inst[u]);
LOGPF("Instance %s assigned client name %s", inst[u]->name, jack_get_client_name(data->client));
//create and initialize jack ports
for(p = 0; p < data->ports; p++){
if(pthread_mutex_init(&(data->port[p].lock), &mutex_attr)){
LOG("Failed to create port mutex");
goto bail;
}
data->port[p].port = jack_port_register(data->client,
data->port[p].name,
(data->port[p].type == port_cv) ? JACK_DEFAULT_AUDIO_TYPE : JACK_DEFAULT_MIDI_TYPE,
data->port[p].input ? JackPortIsInput : JackPortIsOutput,
0);
jack_set_property(data->client, jack_port_uuid(data->port[p].port), JACKEY_SIGNAL_TYPE, "CV", "text/plain");
if(!data->port[p].port){
LOGPF("Failed to create port %s.%s", inst[u]->name, data->port[p].name);
goto bail;
}
}
//do the thing
if(jack_activate(data->client)){
LOGPF("Failed to activate client for instance %s", inst[u]->name);
goto bail;
}
}
LOGPF("Registered %" PRIsize_t " descriptors to core", n);
rv = 0;
bail:
pthread_mutexattr_destroy(&mutex_attr);
return rv;
}
static int mmjack_shutdown(size_t n, instance** inst){
size_t u, p;
mmjack_instance_data* data = NULL;
for(u = 0; u < n; u++){
data = (mmjack_instance_data*) inst[u]->impl;
//deactivate client to stop processing before free'ing channel data
if(data->client){
jack_deactivate(data->client);
}
//iterate and close ports
for(p = 0; p < data->ports; p++){
jack_remove_property(data->client, jack_port_uuid(data->port[p].port), JACKEY_SIGNAL_TYPE);
if(data->port[p].port){
jack_port_unregister(data->client, data->port[p].port);
}
free(data->port[p].name);
data->port[p].name = NULL;
free(data->port[p].queue);
data->port[p].queue = NULL;
data->port[p].queue_alloc = data->port[p].queue_len = 0;
pthread_mutex_destroy(&data->port[p].lock);
}
//terminate jack connection
if(data->client){
jack_client_close(data->client);
}
//clean up instance data
free(data->server_name);
data->server_name = NULL;
free(data->client_name);
data->client_name = NULL;
close(data->fd);
data->fd = -1;
free(inst[u]->impl);
}
LOG("Backend shut down");
return 0;
}
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