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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 struct {
uint32_t next_frame;
uint8_t default_net;
size_t fds;
artnet_descriptor* fd;
uint8_t detect;
} global_cfg = {
0
};
static int artnet_listener(char* host, char* port, struct sockaddr_storage* announce){
int fd;
char announce_addr[INET_ADDRSTRLEN];
if(global_cfg.fds >= MAX_FDS){
LOG("Backend socket limit reached");
return -1;
}
fd = mmbackend_socket(host, port, SOCK_DGRAM, 1, 1, 1);
if(fd < 0){
return -1;
}
//store fd
global_cfg.fd = realloc(global_cfg.fd, (global_cfg.fds + 1) * sizeof(artnet_descriptor));
if(!global_cfg.fd){
close(fd);
global_cfg.fds = 0;
LOG("Failed to allocate memory");
return -1;
}
if(announce->ss_family != AF_INET){
LOGPF("Socket %" PRIsize_t " bound to %s port %s", global_cfg.fds, host, port);
}
else{
mmbackend_sockaddr_ntop((struct sockaddr*) announce, announce_addr, sizeof(announce_addr));
LOGPF("Socket %" PRIsize_t " bound to %s port %s, announced as %s",
global_cfg.fds, host, port, announce_addr);
}
//set announce port if no address is set
//this is used for artpollreply frames
if(!((struct sockaddr_in*) announce)->sin_port){
((struct sockaddr_in*) announce)->sin_port = htobe16(strtoul(port, NULL, 0));
}
global_cfg.fd[global_cfg.fds].fd = fd;
global_cfg.fd[global_cfg.fds].output_instances = 0;
global_cfg.fd[global_cfg.fds].output_instance = NULL;
memcpy(&global_cfg.fd[global_cfg.fds].announce_addr, announce, sizeof(global_cfg.fd[global_cfg.fds].announce_addr));
global_cfg.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(global_cfg.next_frame){
return global_cfg.next_frame;
}
return ARTNET_KEEPALIVE_INTERVAL;
}
static int artnet_configure(char* option, char* value){
char* host = NULL, *port = NULL, *fd_opts = NULL;
struct sockaddr_storage announce = {0};
if(!strcmp(option, "net")){
//configure default net
global_cfg.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(fd_opts){
DBGPF("Parsing fd options %s", fd_opts);
//as there is currently only one additional option, parse only for that
if(!strncmp(fd_opts, "announce=", 9)){
if(mmbackend_parse_sockaddr(fd_opts + 9, port ? port : ARTNET_PORT, &announce, NULL)){
return 1;
}
}
}
if(artnet_listener(host, (port ? port : ARTNET_PORT), &announce)){
LOGPF("Failed to bind socket: %s", value);
return 1;
}
return 0;
}
else if(!strcmp(option, "detect")){
global_cfg.detect = 0;
if(!strcmp(value, "on")){
global_cfg.detect = 1;
}
else if(!strcmp(value, "verbose")){
global_cfg.detect = 2;
}
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));
size_t u;
if(!data){
LOG("Failed to allocate memory");
return 1;
}
data->net = global_cfg.default_net;
for(u = 0; u < sizeof(data->data.channel) / sizeof(channel); u++){
data->data.channel[u].ident = u;
data->data.channel[u].instance = inst;
}
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 >= global_cfg.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);
}
else if(!strcmp(option, "realtime")){
data->realtime = strtoul(value, NULL, 10);
return 0;
}
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--;
//check output capabilities
if((flags & mmchannel_output) && !data->dest_len){
LOGPF("Channel %s.%s mapped for output, but instance is not configured for output (missing destination)", inst->name, spec);
}
//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 data->data.channel + chan_a;
}
static int artnet_transmit(instance* inst, artnet_output_universe* output){
artnet_instance_data* data = (artnet_instance_data*) inst->impl;
//build output frame
artnet_dmx 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(global_cfg.fd[data->fd_index].fd, (uint8_t*) &frame, sizeof(frame), 0, (struct sockaddr*) &data->dest_addr, data->dest_len) < 0){
#ifdef _WIN32
if(WSAGetLastError() != WSAEWOULDBLOCK){
#else
if(errno != EAGAIN){
#endif
LOGPF("Failed to output frame for instance %s: %s", inst->name, mmbackend_socket_strerror(errno));
return 1;
}
//reschedule frame output
output->mark = 1;
if(!global_cfg.next_frame || global_cfg.next_frame > ARTNET_SYNTHESIZE_MARGIN){
global_cfg.next_frame = ARTNET_SYNTHESIZE_MARGIN;
}
return 0;
}
//update last frame timestamp
output->last_frame = mm_timestamp();
output->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, channel_offset = 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++){
channel_offset = c[u]->ident;
if(IS_WIDE(data->data.map[channel_offset])){
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[channel_offset] != ((val >> 8) & 0xFF)){
mark = 1;
data->data.out[channel_offset] = (val >> 8) & 0xFF;
}
if(data->data.out[MAPPED_CHANNEL(data->data.map[channel_offset])] != (val & 0xFF)){
mark = 1;
data->data.out[MAPPED_CHANNEL(data->data.map[channel_offset])] = val & 0xFF;
}
}
else if(data->data.out[channel_offset] != (v[u].normalised * 255.0)){
mark = 1;
data->data.out[channel_offset] = v[u].normalised * 255.0;
}
}
if(mark){
//find output control data for the instance
for(u = 0; u < global_cfg.fd[data->fd_index].output_instances; u++){
if(global_cfg.fd[data->fd_index].output_instance[u].label == inst->ident){
break;
}
}
if(!data->realtime){
frame_delta = mm_timestamp() - global_cfg.fd[data->fd_index].output_instance[u].last_frame;
//check output rate limit, request next frame
if(frame_delta < ARTNET_FRAME_TIMEOUT){
global_cfg.fd[data->fd_index].output_instance[u].mark = 1;
if(!global_cfg.next_frame || global_cfg.next_frame > (ARTNET_FRAME_TIMEOUT - frame_delta)){
global_cfg.next_frame = (ARTNET_FRAME_TIMEOUT - frame_delta);
}
return 0;
}
}
return artnet_transmit(inst, global_cfg.fd[data->fd_index].output_instance + u);
}
return 0;
}
static inline int artnet_process_dmx(instance* inst, artnet_dmx* 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(!data->last_input && global_cfg.detect){
LOGPF("Valid data on instance %s (Net %d Universe %d): %d channels", inst->name, data->net, data->uni, be16toh(frame->length));
}
data->last_input = mm_timestamp();
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;
chan = data->data.channel + p;
if(data->data.map[p] & MAP_FINE){
chan = data->data.channel + MAPPED_CHANNEL(data->data.map[p]);
}
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_process_poll(uint8_t fd, struct sockaddr* source, socklen_t source_len){
size_t n = 0, u, i = 1;
instance** instances = NULL;
artnet_instance_data* data = NULL;
struct sockaddr_in* announce = (struct sockaddr_in*) &(global_cfg.fd[fd].announce_addr);
artnet_instance_id inst_id = {
.label = 0
};
artnet_poll_reply frame = {
.magic = {'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
.opcode = htobe16(OpPollReply),
.oem = htobe16(ARTNET_OEM),
.status = 0xD0, //indicators normal, address set by frontpanel
.manufacturer = htole16(ARTNET_ESTA_MANUFACTURER),
.longname = "MIDIMonster - ",
.ports = htobe16(1),
.video = 0x01, //deprecated, but mark as playing ethernet data
.status2 = 0x08, //supports 15bit port address
.port_out_b = {0xC0} //no rdm, delta output
};
//for some stupid reason, the standard insists on including the peer address not once
//but TWICE in the PollReply frame (instead of just using the sender address).
//it also completely ignores the existence of anything other than ipv4.
if(announce->sin_family == AF_INET){
memcpy(frame.ip4, &(announce->sin_addr.s_addr), 4);
memcpy(frame.parent_ip, &(announce->sin_addr.s_addr), 4);
}
//the announce port is always valid
frame.port = htole16(be16toh(announce->sin_port));
//prepare listing of all instances on this socket
if(mm_backend_instances(BACKEND_NAME, &n, &instances)){
LOG("Failed to query backend instances");
return 1;
}
for(u = 0; u < n; u++){
inst_id.label = instances[u]->ident;
if(inst_id.fields.fd_index == fd){
data = (artnet_instance_data*) instances[u]->impl;
DBGPF("Poll reply %" PRIsize_t " for socket %d: Instance %s net %d universe %d",
i, fd, instances[u]->name, inst_id.fields.net, inst_id.fields.uni);
frame.parent_index = i;
frame.port_address = htobe16(((inst_id.fields.net & 0x7F) << 8) | (inst_id.fields.uni >> 4));
//we can always do output (as seen by the artnet spec)
frame.port_types[0] = 0x80; //output from artnet network enabled
frame.subaddr_out[0] = inst_id.fields.uni & 0x0F;
//data output status as seen from artnet, ie. midimonster input status
frame.port_out[0] = data->last_input ? 0x82 /*transmitting, ltp*/ : 0x02 /*ltp*/;
//default artnet input (ie. midimonster output) state
frame.port_in[0] = 0x08 /*input disabled*/;
//if this instance is enabled for output (input in artnet spec terminology), announce that
if(data->dest_len){
frame.port_types[0] |= 0x40; //input to artnet network enabled
frame.subaddr_in[0] = inst_id.fields.uni & 0x0F;
frame.port_in[0] = 0x80 /*receiving - well, transmitting*/;
}
strncpy((char*) frame.shortname, instances[u]->name, sizeof(frame.shortname) - 1);
strncpy((char*) frame.longname + 14, instances[u]->name, sizeof(frame.longname) - 15);
//the most recent spec document says to always send ArtPollReply frames to the directed broadcast address, while earlier standards just unicast it to the sender
//we just do the latter because it is easier (and IMO makes more sense)
if(sendto(global_cfg.fd[fd].fd, (uint8_t*) &frame, sizeof(frame), 0, source, source_len) < 0){
#ifdef _WIN32
if(WSAGetLastError() != WSAEWOULDBLOCK){
#else
if(errno != EAGAIN){
#endif
LOGPF("Failed to send poll reply for instance %s: %s", instances[u]->name, mmbackend_socket_strerror(errno));
return 1;
}
}
i++;
}
}
free(instances);
return 0;
}
static int artnet_maintenance(){
size_t u, c;
uint64_t timestamp = mm_timestamp();
uint32_t synthesize_delta = 0;
instance* inst = NULL;
//transmit keepalive & synthesized frames
global_cfg.next_frame = 0;
for(u = 0; u < global_cfg.fds; u++){
for(c = 0; c < global_cfg.fd[u].output_instances; c++){
synthesize_delta = timestamp - global_cfg.fd[u].output_instance[c].last_frame;
if((global_cfg.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, global_cfg.fd[u].output_instance[c].label);
if(inst){
artnet_transmit(inst, global_cfg.fd[u].output_instance + c);
}
}
//update next_frame
if(global_cfg.fd[u].output_instance[c].mark
&& (!global_cfg.next_frame || global_cfg.next_frame > ARTNET_FRAME_TIMEOUT + ARTNET_SYNTHESIZE_MARGIN - synthesize_delta)){
global_cfg.next_frame = ARTNET_FRAME_TIMEOUT + ARTNET_SYNTHESIZE_MARGIN - synthesize_delta;
}
}
}
return 0;
}
static int artnet_handle(size_t num, managed_fd* fds){
size_t u;
struct sockaddr_storage peer_addr;
socklen_t peer_len = sizeof(peer_addr);
ssize_t bytes_read;
char recv_buf[ARTNET_RECV_BUF];
artnet_instance_id inst_id = {
.label = 0
};
instance* inst = NULL;
artnet_dmx* frame = (artnet_dmx*) recv_buf;
if(artnet_maintenance()){
return 1;
}
for(u = 0; u < num; u++){
do{
bytes_read = recvfrom(fds[u].fd, recv_buf, sizeof(recv_buf), 0, (struct sockaddr*) &peer_addr, &peer_len);
if(bytes_read > 0 && bytes_read > sizeof(artnet_hdr) && !memcmp(frame->magic, "Art-Net\0", 8)){
//DBGPF("Frame with opcode %04X, size %" PRIsize_t " on socket %" PRIu64, be16toh(frame->opcode), bytes_read, ((uint64_t) fds[u].impl) & 0xFF);
if(be16toh(frame->opcode) == OpDmx && bytes_read >= (sizeof(artnet_dmx) - 512)){
//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_dmx(inst, frame)){
LOG("Failed to process DMX frame");
}
else if(!inst && global_cfg.detect > 1){
LOGPF("Received data for unconfigured universe %d (net %d) on socket %" PRIu64, frame->universe, frame->net, (((uint64_t) fds[u].impl) & 0xFF));
}
}
else if(be16toh(frame->opcode) == OpPoll && bytes_read >= sizeof(artnet_poll)){
if(artnet_process_poll(((uint64_t) fds[u].impl) & 0xFF, (struct sockaddr*) &peer_addr, peer_len)){
LOG("Failed to process discovery 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", mmbackend_socket_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(!global_cfg.fds){
LOG("Failed to start backend: no sockets 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){
global_cfg.fd[data->fd_index].output_instance = realloc(global_cfg.fd[data->fd_index].output_instance, (global_cfg.fd[data->fd_index].output_instances + 1) * sizeof(artnet_output_universe));
if(!global_cfg.fd[data->fd_index].output_instance){
LOG("Failed to allocate memory");
goto bail;
}
global_cfg.fd[data->fd_index].output_instance[global_cfg.fd[data->fd_index].output_instances].label = id.label;
global_cfg.fd[data->fd_index].output_instance[global_cfg.fd[data->fd_index].output_instances].last_frame = 0;
global_cfg.fd[data->fd_index].output_instance[global_cfg.fd[data->fd_index].output_instances].mark = 0;
global_cfg.fd[data->fd_index].output_instances++;
}
}
LOGPF("Registering %" PRIsize_t " descriptors to core", global_cfg.fds);
for(u = 0; u < global_cfg.fds; u++){
if(mm_manage_fd(global_cfg.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 < global_cfg.fds; p++){
close(global_cfg.fd[p].fd);
free(global_cfg.fd[p].output_instance);
}
free(global_cfg.fd);
global_cfg.fd = NULL;
global_cfg.fds = 0;
LOG("Backend shut down");
return 0;
}
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