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|
#define BACKEND_NAME "artnet"
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "libmmbackend.h"
#include "artnet.h"
#define MAX_FDS 255
static uint32_t next_frame = 0;
static uint8_t default_net = 0;
static size_t artnet_fds = 0;
static artnet_descriptor* artnet_fd = NULL;
static int artnet_listener(char* host, char* port){
int fd;
if(artnet_fds >= MAX_FDS){
LOG("Backend descriptor limit reached");
return -1;
}
fd = mmbackend_socket(host, port, SOCK_DGRAM, 1, 1);
if(fd < 0){
return -1;
}
//store fd
artnet_fd = realloc(artnet_fd, (artnet_fds + 1) * sizeof(artnet_descriptor));
if(!artnet_fd){
close(fd);
LOG("Failed to allocate memory");
return -1;
}
LOGPF("Interface %" PRIsize_t " bound to %s port %s", artnet_fds, host, port);
artnet_fd[artnet_fds].fd = fd;
artnet_fd[artnet_fds].output_instances = 0;
artnet_fd[artnet_fds].output_instance = NULL;
artnet_fds++;
return 0;
}
MM_PLUGIN_API int init(){
backend artnet = {
.name = BACKEND_NAME,
.conf = artnet_configure,
.create = artnet_instance,
.conf_instance = artnet_configure_instance,
.channel = artnet_channel,
.handle = artnet_set,
.process = artnet_handle,
.start = artnet_start,
.interval = artnet_interval,
.shutdown = artnet_shutdown
};
if(sizeof(artnet_instance_id) != sizeof(uint64_t)){
LOG("Instance identification union out of bounds");
return 1;
}
//register backend
if(mm_backend_register(artnet)){
LOG("Failed to register backend");
return 1;
}
return 0;
}
static uint32_t artnet_interval(){
if(next_frame){
return next_frame;
}
return ARTNET_KEEPALIVE_INTERVAL;
}
static int artnet_configure(char* option, char* value){
char* host = NULL, *port = NULL, *fd_opts = NULL;
if(!strcmp(option, "net")){
//configure default net
default_net = strtoul(value, NULL, 0);
return 0;
}
else if(!strcmp(option, "bind")){
mmbackend_parse_hostspec(value, &host, &port, &fd_opts);
if(!host){
LOGPF("%s is not a valid bind address", value);
return 1;
}
if(artnet_listener(host, (port ? port : ARTNET_PORT))){
LOGPF("Failed to bind descriptor: %s", value);
return 1;
}
return 0;
}
LOGPF("Unknown backend option %s", option);
return 1;
}
static int artnet_instance(instance* inst){
artnet_instance_data* data = calloc(1, sizeof(artnet_instance_data));
if(!data){
LOG("Failed to allocate memory");
return 1;
}
data->net = default_net;
inst->impl = data;
return 0;
}
static int artnet_configure_instance(instance* inst, char* option, char* value){
char* host = NULL, *port = NULL;
artnet_instance_data* data = (artnet_instance_data*) inst->impl;
if(!strcmp(option, "net")){
data->net = strtoul(value, NULL, 0);
return 0;
}
else if(!strcmp(option, "uni") || !strcmp(option, "universe")){
data->uni = strtoul(value, NULL, 0);
return 0;
}
else if(!strcmp(option, "iface") || !strcmp(option, "interface")){
data->fd_index = strtoul(value, NULL, 0);
if(data->fd_index >= artnet_fds){
LOGPF("Invalid interface configured for instance %s", inst->name);
return 1;
}
return 0;
}
else if(!strcmp(option, "dest") || !strcmp(option, "destination")){
mmbackend_parse_hostspec(value, &host, &port, NULL);
if(!host){
LOGPF("Not a valid destination for instance %s: %s", inst->name, value);
return 1;
}
return mmbackend_parse_sockaddr(host, port ? port : ARTNET_PORT, &data->dest_addr, &data->dest_len);
}
LOGPF("Unknown instance option %s for instance %s", option, inst->name);
return 1;
}
static channel* artnet_channel(instance* inst, char* spec, uint8_t flags){
artnet_instance_data* data = (artnet_instance_data*) inst->impl;
char* spec_next = spec;
unsigned chan_a = strtoul(spec, &spec_next, 10);
unsigned chan_b = 0;
//primary channel sanity check
if(!chan_a || chan_a > 512){
LOGPF("Invalid channel specification %s", spec);
return NULL;
}
chan_a--;
//secondary channel setup
if(*spec_next == '+'){
chan_b = strtoul(spec_next + 1, NULL, 10);
if(!chan_b || chan_b > 512){
LOGPF("Invalid wide-channel specification %s", spec);
return NULL;
}
chan_b--;
//if mapped mode differs, bail
if(IS_ACTIVE(data->data.map[chan_b]) && data->data.map[chan_b] != (MAP_FINE | chan_a)){
LOGPF("Fine channel already mapped for spec %s", spec);
return NULL;
}
data->data.map[chan_b] = MAP_FINE | chan_a;
}
//check current map mode
if(IS_ACTIVE(data->data.map[chan_a])){
if((*spec_next == '+' && data->data.map[chan_a] != (MAP_COARSE | chan_b))
|| (*spec_next != '+' && data->data.map[chan_a] != (MAP_SINGLE | chan_a))){
LOGPF("Primary channel already mapped at differing mode: %s", spec);
return NULL;
}
}
data->data.map[chan_a] = (*spec_next == '+') ? (MAP_COARSE | chan_b) : (MAP_SINGLE | chan_a);
return mm_channel(inst, chan_a, 1);
}
static int artnet_transmit(instance* inst){
size_t u;
artnet_instance_data* data = (artnet_instance_data*) inst->impl;
//output frame
artnet_pkt frame = {
.magic = {'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
.opcode = htobe16(OpDmx),
.version = htobe16(ARTNET_VERSION),
.sequence = data->data.seq++,
.port = 0,
.universe = data->uni,
.net = data->net,
.length = htobe16(512),
.data = {0}
};
memcpy(frame.data, data->data.out, 512);
if(sendto(artnet_fd[data->fd_index].fd, (uint8_t*) &frame, sizeof(frame), 0, (struct sockaddr*) &data->dest_addr, data->dest_len) < 0){
LOGPF("Failed to output frame for instance %s: %s", inst->name, strerror(errno));
}
//update last frame timestamp
for(u = 0; u < artnet_fd[data->fd_index].output_instances; u++){
if(artnet_fd[data->fd_index].output_instance[u].label == inst->ident){
artnet_fd[data->fd_index].output_instance[u].last_frame = mm_timestamp();
artnet_fd[data->fd_index].output_instance[u].mark = 0;
}
}
return 0;
}
static int artnet_set(instance* inst, size_t num, channel** c, channel_value* v){
uint32_t frame_delta = 0;
size_t u, mark = 0;
artnet_instance_data* data = (artnet_instance_data*) inst->impl;
if(!data->dest_len){
LOGPF("Instance %s not enabled for output (%" PRIsize_t " channel events)", inst->name, num);
return 0;
}
for(u = 0; u < num; u++){
if(IS_WIDE(data->data.map[c[u]->ident])){
uint32_t val = v[u].normalised * ((double) 0xFFFF);
//the primary (coarse) channel is the one registered to the core, so we don't have to check for that
if(data->data.out[c[u]->ident] != ((val >> 8) & 0xFF)){
mark = 1;
data->data.out[c[u]->ident] = (val >> 8) & 0xFF;
}
if(data->data.out[MAPPED_CHANNEL(data->data.map[c[u]->ident])] != (val & 0xFF)){
mark = 1;
data->data.out[MAPPED_CHANNEL(data->data.map[c[u]->ident])] = val & 0xFF;
}
}
else if(data->data.out[c[u]->ident] != (v[u].normalised * 255.0)){
mark = 1;
data->data.out[c[u]->ident] = v[u].normalised * 255.0;
}
}
if(mark){
//find last frame time
for(u = 0; u < artnet_fd[data->fd_index].output_instances; u++){
if(artnet_fd[data->fd_index].output_instance[u].label == inst->ident){
break;
}
}
frame_delta = mm_timestamp() - artnet_fd[data->fd_index].output_instance[u].last_frame;
//check output rate limit, request next frame
if(frame_delta < ARTNET_FRAME_TIMEOUT){
artnet_fd[data->fd_index].output_instance[u].mark = 1;
if(!next_frame || next_frame > (ARTNET_KEEPALIVE_INTERVAL - frame_delta)){
next_frame = (ARTNET_KEEPALIVE_INTERVAL - frame_delta);
}
return 0;
}
return artnet_transmit(inst);
}
return 0;
}
static inline int artnet_process_frame(instance* inst, artnet_pkt* frame){
size_t p, max_mark = 0;
uint16_t wide_val = 0;
channel* chan = NULL;
channel_value val;
artnet_instance_data* data = (artnet_instance_data*) inst->impl;
if(be16toh(frame->length) > 512){
LOGPF("Invalid frame channel count: %d", be16toh(frame->length));
return 1;
}
//read data, mark update channels
for(p = 0; p < be16toh(frame->length); p++){
if(IS_ACTIVE(data->data.map[p]) && frame->data[p] != data->data.in[p]){
data->data.in[p] = frame->data[p];
data->data.map[p] |= MAP_MARK;
max_mark = p;
}
}
//generate events
for(p = 0; p <= max_mark; p++){
if(data->data.map[p] & MAP_MARK){
data->data.map[p] &= ~MAP_MARK;
if(data->data.map[p] & MAP_FINE){
chan = mm_channel(inst, MAPPED_CHANNEL(data->data.map[p]), 0);
}
else{
chan = mm_channel(inst, p, 0);
}
if(!chan){
LOGPF("Active channel %" PRIsize_t " on %s not known to core", p, inst->name);
return 1;
}
if(IS_WIDE(data->data.map[p])){
data->data.map[MAPPED_CHANNEL(data->data.map[p])] &= ~MAP_MARK;
wide_val = data->data.in[p] << ((data->data.map[p] & MAP_COARSE) ? 8 : 0);
wide_val |= data->data.in[MAPPED_CHANNEL(data->data.map[p])] << ((data->data.map[p] & MAP_COARSE) ? 0 : 8);
val.raw.u64 = wide_val;
val.normalised = (double) wide_val / (double) 0xFFFF;
}
else{
//single channel
val.raw.u64 = data->data.in[p];
val.normalised = (double) data->data.in[p] / 255.0;
}
if(mm_channel_event(chan, val)){
LOG("Failed to push channel event to core");
return 1;
}
}
}
return 0;
}
static int artnet_handle(size_t num, managed_fd* fds){
size_t u, c;
uint64_t timestamp = mm_timestamp();
uint32_t synthesize_delta = 0;
ssize_t bytes_read;
char recv_buf[ARTNET_RECV_BUF];
artnet_instance_id inst_id = {
.label = 0
};
instance* inst = NULL;
artnet_pkt* frame = (artnet_pkt*) recv_buf;
//transmit keepalive & synthesized frames
next_frame = 0;
for(u = 0; u < artnet_fds; u++){
for(c = 0; c < artnet_fd[u].output_instances; c++){
synthesize_delta = timestamp - artnet_fd[u].output_instance[c].last_frame;
if((artnet_fd[u].output_instance[c].mark
&& synthesize_delta >= ARTNET_FRAME_TIMEOUT + ARTNET_SYNTHESIZE_MARGIN) //synthesize next frame
|| synthesize_delta >= ARTNET_KEEPALIVE_INTERVAL){ //keepalive timeout
inst = mm_instance_find(BACKEND_NAME, artnet_fd[u].output_instance[c].label);
if(inst){
artnet_transmit(inst);
}
}
//update next_frame
if(artnet_fd[u].output_instance[c].mark
&& (!next_frame || next_frame > ARTNET_FRAME_TIMEOUT + ARTNET_SYNTHESIZE_MARGIN - synthesize_delta)){
next_frame = ARTNET_FRAME_TIMEOUT + ARTNET_SYNTHESIZE_MARGIN - synthesize_delta;
}
}
}
if(!num){
//early exit
return 0;
}
for(u = 0; u < num; u++){
do{
bytes_read = recv(fds[u].fd, recv_buf, sizeof(recv_buf), 0);
if(bytes_read > 0 && bytes_read > sizeof(artnet_hdr)){
if(!memcmp(frame->magic, "Art-Net\0", 8) && be16toh(frame->opcode) == OpDmx){
//find matching instance
inst_id.fields.fd_index = ((uint64_t) fds[u].impl) & 0xFF;
inst_id.fields.net = frame->net;
inst_id.fields.uni = frame->universe;
inst = mm_instance_find(BACKEND_NAME, inst_id.label);
if(inst && artnet_process_frame(inst, frame)){
LOG("Failed to process frame");
}
}
}
} while(bytes_read > 0);
#ifdef _WIN32
if(bytes_read < 0 && WSAGetLastError() != WSAEWOULDBLOCK){
#else
if(bytes_read < 0 && errno != EAGAIN){
#endif
LOGPF("Failed to receive data: %s", strerror(errno));
}
if(bytes_read == 0){
LOG("Listener closed");
return 1;
}
}
return 0;
}
static int artnet_start(size_t n, instance** inst){
size_t u, p;
int rv = 1;
artnet_instance_data* data = NULL;
artnet_instance_id id = {
.label = 0
};
if(!artnet_fds){
LOG("Failed to start backend: no descriptors bound");
return 1;
}
for(u = 0; u < n; u++){
data = (artnet_instance_data*) inst[u]->impl;
//set instance identifier
id.fields.fd_index = data->fd_index;
id.fields.net = data->net;
id.fields.uni = data->uni;
inst[u]->ident = id.label;
//check for duplicates
for(p = 0; p < u; p++){
if(inst[u]->ident == inst[p]->ident){
LOGPF("Universe specified multiple times, use one instance: %s - %s", inst[u]->name, inst[p]->name);
goto bail;
}
}
//if enabled for output, add to keepalive tracking
if(data->dest_len){
artnet_fd[data->fd_index].output_instance = realloc(artnet_fd[data->fd_index].output_instance, (artnet_fd[data->fd_index].output_instances + 1) * sizeof(artnet_output_universe));
if(!artnet_fd[data->fd_index].output_instance){
LOG("Failed to allocate memory");
goto bail;
}
artnet_fd[data->fd_index].output_instance[artnet_fd[data->fd_index].output_instances].label = id.label;
artnet_fd[data->fd_index].output_instance[artnet_fd[data->fd_index].output_instances].last_frame = 0;
artnet_fd[data->fd_index].output_instance[artnet_fd[data->fd_index].output_instances].mark = 0;
artnet_fd[data->fd_index].output_instances++;
}
}
LOGPF("Registering %" PRIsize_t " descriptors to core", artnet_fds);
for(u = 0; u < artnet_fds; u++){
if(mm_manage_fd(artnet_fd[u].fd, BACKEND_NAME, 1, (void*) u)){
goto bail;
}
}
rv = 0;
bail:
return rv;
}
static int artnet_shutdown(size_t n, instance** inst){
size_t p;
for(p = 0; p < n; p++){
free(inst[p]->impl);
}
for(p = 0; p < artnet_fds; p++){
close(artnet_fd[p].fd);
free(artnet_fd[p].output_instance);
}
free(artnet_fd);
LOG("Backend shut down");
return 0;
}
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