diff options
Diffstat (limited to 'backends/winmidi.c')
| -rw-r--r-- | backends/winmidi.c | 603 |
1 files changed, 603 insertions, 0 deletions
diff --git a/backends/winmidi.c b/backends/winmidi.c new file mode 100644 index 0000000..790257b --- /dev/null +++ b/backends/winmidi.c @@ -0,0 +1,603 @@ +#include <string.h> + +#include "libmmbackend.h" +#include <mmsystem.h> + +#include "winmidi.h" + +#define BACKEND_NAME "winmidi" + +static struct { + uint8_t list_devices; + uint8_t detect; + int socket_pair[2]; + + CRITICAL_SECTION push_events; + volatile size_t events_alloc; + volatile size_t events_active; + volatile winmidi_event* event; +} backend_config = { + .list_devices = 0, + .socket_pair = {-1, -1} +}; + +//TODO receive feedback socket until EAGAIN + +MM_PLUGIN_API int init(){ + backend winmidi = { + .name = BACKEND_NAME, + .conf = winmidi_configure, + .create = winmidi_instance, + .conf_instance = winmidi_configure_instance, + .channel = winmidi_channel, + .handle = winmidi_set, + .process = winmidi_handle, + .start = winmidi_start, + .shutdown = winmidi_shutdown + }; + + if(sizeof(winmidi_channel_ident) != sizeof(uint64_t)){ + fprintf(stderr, "winmidi channel identification union out of bounds\n"); + return 1; + } + + //register backend + if(mm_backend_register(winmidi)){ + fprintf(stderr, "Failed to register winmidi backend\n"); + return 1; + } + + //initialize critical section + InitializeCriticalSectionAndSpinCount(&backend_config.push_events, 4000); + return 0; +} + +static int winmidi_configure(char* option, char* value){ + if(!strcmp(option, "list")){ + backend_config.list_devices = 0; + if(!strcmp(value, "on")){ + backend_config.list_devices = 1; + } + return 0; + } + else if(!strcmp(option, "detect")){ + backend_config.detect = 0; + if(!strcmp(value, "on")){ + backend_config.detect = 1; + } + return 0; + } + + fprintf(stderr, "Unknown winmidi backend option %s\n", option); + return 1; +} + +static int winmidi_configure_instance(instance* inst, char* option, char* value){ + winmidi_instance_data* data = (winmidi_instance_data*) inst->impl; + if(!strcmp(option, "read")){ + if(data->read){ + fprintf(stderr, "winmidi instance %s already connected to an input device\n", inst->name); + return 1; + } + data->read = strdup(value); + return 0; + } + if(!strcmp(option, "write")){ + if(data->write){ + fprintf(stderr, "winmidi instance %s already connected to an output device\n", inst->name); + return 1; + } + data->write = strdup(value); + return 0; + } + + fprintf(stderr, "Unknown winmidi instance option %s\n", option); + return 1; +} + +static instance* winmidi_instance(){ + instance* i = mm_instance(); + if(!i){ + return NULL; + } + + i->impl = calloc(1, sizeof(winmidi_instance_data)); + if(!i->impl){ + fprintf(stderr, "Failed to allocate memory\n"); + return NULL; + } + + return i; +} + +static channel* winmidi_channel(instance* inst, char* spec, uint8_t flags){ + char* next_token = NULL; + winmidi_channel_ident ident = { + .label = 0 + }; + + if(!strncmp(spec, "ch", 2)){ + next_token = spec + 2; + if(!strncmp(spec, "channel", 7)){ + next_token = spec + 7; + } + } + + if(!next_token){ + fprintf(stderr, "Invalid winmidi channel specification %s\n", spec); + return NULL; + } + + ident.fields.channel = strtoul(next_token, &next_token, 10); + if(ident.fields.channel > 15){ + fprintf(stderr, "MIDI channel out of range in winmidi channel spec %s\n", spec); + return NULL; + } + + if(*next_token != '.'){ + fprintf(stderr, "winmidi channel specification %s does not conform to channel<X>.<control><Y>\n", spec); + return NULL; + } + + next_token++; + + if(!strncmp(next_token, "cc", 2)){ + ident.fields.type = cc; + next_token += 2; + } + else if(!strncmp(next_token, "note", 4)){ + ident.fields.type = note; + next_token += 4; + } + else if(!strncmp(next_token, "pressure", 8)){ + ident.fields.type = pressure; + next_token += 8; + } + else if(!strncmp(next_token, "pitch", 5)){ + ident.fields.type = pitchbend; + } + else if(!strncmp(next_token, "aftertouch", 10)){ + ident.fields.type = aftertouch; + } + else{ + fprintf(stderr, "Unknown winmidi channel control type in %s\n", spec); + return NULL; + } + + ident.fields.control = strtoul(next_token, NULL, 10); + + if(ident.label){ + return mm_channel(inst, ident.label, 1); + } + return NULL; +} + +static int winmidi_set(instance* inst, size_t num, channel** c, channel_value* v){ + winmidi_instance_data* data = (winmidi_instance_data*) inst->impl; + winmidi_channel_ident ident = { + .label = 0 + }; + union { + struct { + uint8_t status; + uint8_t data1; + uint8_t data2; + uint8_t unused; + } components; + DWORD dword; + } output = { + .dword = 0 + }; + size_t u; + + //early exit + if(!num){ + return 0; + } + + if(!data->device_out){ + fprintf(stderr, "winmidi instance %s has no output device\n", inst->name); + return 0; + } + + for(u = 0; u < num; u++){ + ident.label = c[u]->ident; + + //build output message + output.components.status = ident.fields.type | ident.fields.channel; + output.components.data1 = ident.fields.control; + output.components.data2 = v[u].normalised * 127.0; + if(ident.fields.type == pitchbend){ + output.components.data1 = ((int)(v[u].normalised * 16384.0)) & 0x7F; + output.components.data2 = (((int)(v[u].normalised * 16384.0)) >> 7) & 0x7F; + } + else if(ident.fields.type == aftertouch){ + output.components.data1 = v[u].normalised * 127.0; + output.components.data2 = 0; + } + + midiOutShortMsg(data->device_out, output.dword); + } + + return 0; +} + +static char* winmidi_type_name(uint8_t typecode){ + switch(typecode){ + case note: + return "note"; + case cc: + return "cc"; + case pressure: + return "pressure"; + case aftertouch: + return "aftertouch"; + case pitchbend: + return "pitch"; + } + return "unknown"; +} + +static int winmidi_handle(size_t num, managed_fd* fds){ + size_t u; + ssize_t bytes = 0; + char recv_buf[1024]; + channel* chan = NULL; + if(!num){ + return 0; + } + + //flush the feedback socket + for(u = 0; u < num; u++){ + bytes += recv(fds[u].fd, recv_buf, sizeof(recv_buf), 0); + } + + //push queued events + EnterCriticalSection(&backend_config.push_events); + for(u = 0; u < backend_config.events_active; u++){ + if(backend_config.detect){ + //pretty-print channel-wide events + if(backend_config.event[u].channel.fields.type == pitchbend + || backend_config.event[u].channel.fields.type == aftertouch){ + fprintf(stderr, "Incoming MIDI data on channel %s.ch%d.%s, value %f\n", + backend_config.event[u].inst->name, + backend_config.event[u].channel.fields.channel, + winmidi_type_name(backend_config.event[u].channel.fields.type), + backend_config.event[u].value); + } + else{ + fprintf(stderr, "Incoming MIDI data on channel %s.ch%d.%s%d, value %f\n", + backend_config.event[u].inst->name, + backend_config.event[u].channel.fields.channel, + winmidi_type_name(backend_config.event[u].channel.fields.type), + backend_config.event[u].channel.fields.control, + backend_config.event[u].value); + } + } + chan = mm_channel(backend_config.event[u].inst, backend_config.event[u].channel.label, 0); + if(chan){ + mm_channel_event(chan, backend_config.event[u].value); + } + } + DBGPF("winmidi flushed %" PRIsize_t " wakeups, handled %" PRIsize_t " events\n", bytes, backend_config.events_active); + backend_config.events_active = 0; + LeaveCriticalSection(&backend_config.push_events); + return 0; +} + +static void CALLBACK winmidi_input_callback(HMIDIIN device, unsigned message, DWORD_PTR inst, DWORD param1, DWORD param2){ + winmidi_channel_ident ident = { + .label = 0 + }; + channel_value val; + union { + struct { + uint8_t status; + uint8_t data1; + uint8_t data2; + uint8_t unused; + } components; + DWORD dword; + } input = { + .dword = 0 + }; + + //callbacks may run on different threads, so we queue all events and alert the main thread via the feedback socket + DBGPF("winmidi input callback on thread %ld\n", GetCurrentThreadId()); + + switch(message){ + case MIM_MOREDATA: + //processing too slow, do not immediately alert the main loop + case MIM_DATA: + //param1 has the message + input.dword = param1; + ident.fields.channel = input.components.status & 0x0F; + ident.fields.type = input.components.status & 0xF0; + ident.fields.control = input.components.data1; + val.normalised = (double) input.components.data2 / 127.0; + + if(ident.fields.type == 0x80){ + ident.fields.type = note; + val.normalised = 0; + } + else if(ident.fields.type == pitchbend){ + ident.fields.control = 0; + val.normalised = (double)((input.components.data2 << 7) | input.components.data1) / 16384.0; + } + else if(ident.fields.type == aftertouch){ + ident.fields.control = 0; + val.normalised = (double) input.components.data1 / 127.0; + } + break; + case MIM_LONGDATA: + //sysex message, ignore + return; + case MIM_ERROR: + //error in input stream + fprintf(stderr, "winmidi warning: error in input stream\n"); + return; + case MIM_OPEN: + case MIM_CLOSE: + //device opened/closed + return; + + } + + DBGPF("winmidi incoming message type %d channel %d control %d value %f\n", + ident.fields.type, ident.fields.channel, ident.fields.control, val.normalised); + + EnterCriticalSection(&backend_config.push_events); + if(backend_config.events_alloc <= backend_config.events_active){ + backend_config.event = realloc((void*) backend_config.event, (backend_config.events_alloc + 1) * sizeof(winmidi_event)); + if(!backend_config.event){ + fprintf(stderr, "Failed to allocate memory\n"); + backend_config.events_alloc = 0; + backend_config.events_active = 0; + LeaveCriticalSection(&backend_config.push_events); + return; + } + backend_config.events_alloc++; + } + backend_config.event[backend_config.events_active].inst = (instance*) inst; + backend_config.event[backend_config.events_active].channel.label = ident.label; + backend_config.event[backend_config.events_active].value = val; + backend_config.events_active++; + LeaveCriticalSection(&backend_config.push_events); + + if(message != MIM_MOREDATA){ + //alert the main loop + send(backend_config.socket_pair[1], "w", 1, 0); + } +} + +static void CALLBACK winmidi_output_callback(HMIDIOUT device, unsigned message, DWORD_PTR inst, DWORD param1, DWORD param2){ + DBGPF("winmidi output callback on thread %ld\n", GetCurrentThreadId()); +} + +static int winmidi_match_input(char* prefix){ + MIDIINCAPS input_caps; + unsigned inputs = midiInGetNumDevs(); + char* next_token = NULL; + size_t n; + + if(!prefix){ + fprintf(stderr, "winmidi detected %u input devices\n", inputs); + } + else{ + n = strtoul(prefix, &next_token, 10); + if(!(*next_token) && n < inputs){ + midiInGetDevCaps(n, &input_caps, sizeof(MIDIINCAPS)); + fprintf(stderr, "winmidi selected input device %s for ID %d\n", input_caps.szPname, n); + return n; + } + } + + //find prefix match for input device + for(n = 0; n < inputs; n++){ + midiInGetDevCaps(n, &input_caps, sizeof(MIDIINCAPS)); + if(!prefix){ + printf("\tID %d: %s\n", n, input_caps.szPname); + } + else if(!strncmp(input_caps.szPname, prefix, strlen(prefix))){ + fprintf(stderr, "winmidi selected input device %s (ID %" PRIsize_t ") for name %s\n", input_caps.szPname, n, prefix); + return n; + } + } + + return -1; +} + +static int winmidi_match_output(char* prefix){ + MIDIOUTCAPS output_caps; + unsigned outputs = midiOutGetNumDevs(); + char* next_token = NULL; + size_t n; + + if(!prefix){ + fprintf(stderr, "winmidi detected %u output devices\n", outputs); + } + else{ + n = strtoul(prefix, &next_token, 10); + if(!(*next_token) && n < outputs){ + midiOutGetDevCaps(n, &output_caps, sizeof(MIDIOUTCAPS)); + fprintf(stderr, "winmidi selected output device %s for ID %d\n", output_caps.szPname, n); + return n; + } + } + + //find prefix match for output device + for(n = 0; n < outputs; n++){ + midiOutGetDevCaps(n, &output_caps, sizeof(MIDIOUTCAPS)); + if(!prefix){ + printf("\tID %d: %s\n", n, output_caps.szPname); + } + else if(!strncmp(output_caps.szPname, prefix, strlen(prefix))){ + fprintf(stderr, "winmidi selected output device %s (ID %" PRIsize_t " for name %s\n", output_caps.szPname, n, prefix); + return n; + } + } + + return -1; +} + +static int winmidi_start(){ + size_t n = 0, p; + int device, rv = -1; + instance** inst = NULL; + winmidi_instance_data* data = NULL; + struct sockaddr_storage sockadd = { + 0 + }; + //this really should be a size_t but getsockname specifies int* for some reason + int sockadd_len = sizeof(sockadd); + char* error = NULL; + DBGPF("winmidi main thread ID is %ld\n", GetCurrentThreadId()); + + //fetch all instances + if(mm_backend_instances(BACKEND_NAME, &n, &inst)){ + fprintf(stderr, "Failed to fetch instance list\n"); + return 1; + } + + //no instances, we're done + if(!n){ + free(inst); + return 0; + } + + //output device list if requested + if(backend_config.list_devices){ + winmidi_match_input(NULL); + winmidi_match_output(NULL); + } + + //open the feedback sockets + //for some reason the feedback connection fails to work on 'real' windows with ipv6 + backend_config.socket_pair[0] = mmbackend_socket("127.0.0.1", "0", SOCK_DGRAM, 1, 0); + if(backend_config.socket_pair[0] < 0){ + fprintf(stderr, "winmidi failed to open feedback socket\n"); + return 1; + } + if(getsockname(backend_config.socket_pair[0], (struct sockaddr*) &sockadd, &sockadd_len)){ + FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, + NULL, WSAGetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &error, 0, NULL); + fprintf(stderr, "winmidi failed to query feedback socket information: %s\n", error); + LocalFree(error); + return 1; + } + //getsockname on 'real' windows may not set the address - works on wine, though + switch(sockadd.ss_family){ + case AF_INET: + case AF_INET6: + ((struct sockaddr_in*) &sockadd)->sin_family = AF_INET; + ((struct sockaddr_in*) &sockadd)->sin_addr.s_addr = htobe32(INADDR_LOOPBACK); + break; + //for some absurd reason 'real' windows announces the socket as AF_INET6 but rejects any connection unless its AF_INET +// case AF_INET6: +// ((struct sockaddr_in6*) &sockadd)->sin6_addr = in6addr_any; +// break; + default: + fprintf(stderr, "winmidi invalid feedback socket family\n"); + return 1; + } + DBGPF("winmidi feedback socket family %d port %d\n", sockadd.ss_family, be16toh(((struct sockaddr_in*)&sockadd)->sin_port)); + backend_config.socket_pair[1] = socket(sockadd.ss_family, SOCK_DGRAM, IPPROTO_UDP); + if(backend_config.socket_pair[1] < 0 || connect(backend_config.socket_pair[1], (struct sockaddr*) &sockadd, sockadd_len)){ + FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, + NULL, WSAGetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &error, 0, NULL); + fprintf(stderr, "winmidi failed to connect to feedback socket: %s\n", error); + LocalFree(error); + return 1; + } + + //set up instances and start input + for(p = 0; p < n; p++){ + data = (winmidi_instance_data*) inst[p]->impl; + inst[p]->ident = p; + + //connect input device if requested + if(data->read){ + device = winmidi_match_input(data->read); + if(device < 0){ + fprintf(stderr, "Failed to match input device %s for instance %s\n", data->read, inst[p]->name); + goto bail; + } + if(midiInOpen(&(data->device_in), device, (DWORD_PTR) winmidi_input_callback, (DWORD_PTR) inst[p], CALLBACK_FUNCTION | MIDI_IO_STATUS) != MMSYSERR_NOERROR){ + fprintf(stderr, "Failed to open input device for instance %s\n", inst[p]->name); + goto bail; + } + //start midi input callbacks + midiInStart(data->device_in); + } + + //connect output device if requested + if(data->write){ + device = winmidi_match_output(data->write); + if(device < 0){ + fprintf(stderr, "Failed to match output device %s for instance %s\n", data->read, inst[p]->name); + goto bail; + } + if(midiOutOpen(&(data->device_out), device, (DWORD_PTR) winmidi_output_callback, (DWORD_PTR) inst[p], CALLBACK_FUNCTION) != MMSYSERR_NOERROR){ + fprintf(stderr, "Failed to open output device for instance %s\n", inst[p]->name); + goto bail; + } + } + } + + //register the feedback socket to the core + fprintf(stderr, "winmidi backend registering 1 descriptor to core\n"); + if(mm_manage_fd(backend_config.socket_pair[0], BACKEND_NAME, 1, NULL)){ + goto bail; + } + + rv = 0; +bail: + free(inst); + return rv; +} + +static int winmidi_shutdown(){ + size_t n, u; + instance** inst = NULL; + winmidi_instance_data* data = NULL; + + if(mm_backend_instances(BACKEND_NAME, &n, &inst)){ + fprintf(stderr, "Failed to fetch instance list\n"); + return 1; + } + + for(u = 0; u < n; u++){ + data = (winmidi_instance_data*) inst[u]->impl; + free(data->read); + data->read = NULL; + free(data->write); + data->write = NULL; + + if(data->device_in){ + midiInStop(data->device_in); + midiInClose(data->device_in); + data->device_in = NULL; + } + + if(data->device_out){ + midiOutReset(data->device_out); + midiOutClose(data->device_out); + data->device_out = NULL; + } + } + + free(inst); + closesocket(backend_config.socket_pair[0]); + closesocket(backend_config.socket_pair[1]); + + EnterCriticalSection(&backend_config.push_events); + free((void*) backend_config.event); + backend_config.event = NULL; + backend_config.events_alloc = 0; + backend_config.events_active = 0; + LeaveCriticalSection(&backend_config.push_events); + DeleteCriticalSection(&backend_config.push_events); + + fprintf(stderr, "winmidi backend shut down\n"); + return 0; +} |