/* Copyright (c) 1997-1999 Guenter Geiger, Miller Puckette, Larry Troxler, * Winfried Ritsch, Karl MacMillan, and others. * For information on usage and redistribution, and for a DISCLAIMER OF ALL * WARRANTIES, see the file, "LICENSE.txt," in this distribution. */ /* MIDI I/O for Linux using ALSA */ #include <stdio.h> #ifdef UNISTD #include <unistd.h> #endif #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> #include <alsa/asoundlib.h> #include "desire.h" //#include "s_stuff.h" #define MAX_EVENT_SIZE 256 static int alsa_nmidiin; static int alsa_midiinfd[MAXMIDIINDEV]; static int alsa_nmidiout; static int alsa_midioutfd[MAXMIDIOUTDEV]; static snd_seq_t *midi_handle; static snd_midi_event_t *midiev; static unsigned short CombineBytes(unsigned char First, unsigned char Second) { return ((unsigned short)Second << 7) | (unsigned short)First; } void sys_alsa_do_open_midi(int nmidiin, int *midiinvec, int nmidiout, int *midioutvec) { char portname[50]; int err = 0; snd_seq_client_info_t *alsainfo; /* do we want to connect pd automatically with other devices ?; see below! */ /* LATER: think about a flag to enable/disable automatic connection (sometimes it could be a pain) */ int autoconnect = 1; alsa_nmidiin = 0; alsa_nmidiout = 0; if (nmidiout == 0 && nmidiin == 0) return; if (nmidiin>MAXMIDIINDEV) {post( "midi input ports reduced to maximum %d", MAXMIDIINDEV); nmidiin =MAXMIDIINDEV;} if (nmidiout>MAXMIDIOUTDEV) {post("midi output ports reduced to maximum %d", MAXMIDIOUTDEV); nmidiout=MAXMIDIOUTDEV;} if (nmidiin>0 && nmidiout>0) err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_DUPLEX,0); else if (nmidiin > 0) err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_INPUT,0); else if (nmidiout > 0) err = snd_seq_open(&midi_handle,"default",SND_SEQ_OPEN_OUTPUT,0); if (err!=0) { sys_setalarm(1000000); post("couldn't open alsa sequencer"); return; } int client; for (int i=0; i<nmidiin; i++) { sprintf(portname,"Pure Data Midi-In %d",i+1); int port = snd_seq_create_simple_port(midi_handle,portname, SND_SEQ_PORT_CAP_WRITE |SND_SEQ_PORT_CAP_SUBS_WRITE, SND_SEQ_PORT_TYPE_APPLICATION); if (port < 0) goto error; alsa_midiinfd[i] = port; } for (int i=0; i<nmidiout; i++) { sprintf(portname,"Pure Data Midi-Out %d",i+1); int port = snd_seq_create_simple_port(midi_handle,portname, SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ, SND_SEQ_PORT_TYPE_APPLICATION); if (port < 0) goto error; alsa_midioutfd[i] = port; } snd_seq_client_info_malloc(&alsainfo); snd_seq_get_client_info(midi_handle,alsainfo); snd_seq_client_info_set_name(alsainfo,"Pure Data"); client = snd_seq_client_info_get_client(alsainfo); snd_seq_set_client_info(midi_handle,alsainfo); snd_seq_client_info_free(alsainfo); post("Opened Alsa Client %d in:%d out:%d",client,nmidiin,nmidiout); sys_setalarm(0); snd_midi_event_new(MAX_EVENT_SIZE,&midiev); alsa_nmidiout = nmidiout; alsa_nmidiin = nmidiin; /* JMZ: connect all available devices to pd */ if (autoconnect) { snd_seq_client_info_t *cinfo; snd_seq_port_info_t *pinfo; snd_seq_port_subscribe_t *subs; snd_seq_addr_t other, topd, frompd; /* since i don't know how to connect multiple ports (connect everything to each port, modulo,...), * i only fully connect where we have only one single port */ if(alsa_nmidiin ) { topd.client = client; topd.port = alsa_midiinfd [0];} if(alsa_nmidiout) {frompd.client = client; frompd.port = alsa_midioutfd[0];} snd_seq_port_subscribe_alloca(&subs); snd_seq_client_info_alloca(&cinfo); snd_seq_port_info_alloca(&pinfo); snd_seq_client_info_set_client(cinfo, -1); while (snd_seq_query_next_client(midi_handle, cinfo) >= 0) { /* reset query info */ int client_id=snd_seq_client_info_get_client(cinfo); if((SND_SEQ_CLIENT_SYSTEM != client_id)&&(client != client_id)) { /* skipping port 0 and ourself */ snd_seq_port_info_set_client(pinfo, client_id); snd_seq_port_info_set_port(pinfo, -1); while (snd_seq_query_next_port(midi_handle, pinfo) >= 0) { other.client=client_id; other.port =snd_seq_port_info_get_port(pinfo); if(1==alsa_nmidiin) /* only autoconnect 1st port */ { snd_seq_port_subscribe_set_sender(subs, &other); snd_seq_port_subscribe_set_dest(subs, &topd); snd_seq_subscribe_port(midi_handle, subs); } if(1==alsa_nmidiout) /* only autoconnect 1st port */ { snd_seq_port_subscribe_set_sender(subs, &frompd); snd_seq_port_subscribe_set_dest(subs, &other); snd_seq_subscribe_port(midi_handle, subs); } } } } } return; error: sys_setalarm(1000000); post("couldn't open alsa MIDI output device"); return; } #define md_msglen(x) (((x)<0xC0)?2:((x)<0xE0)?1:((x)<0xF0)?2:\ ((x)==0xF2)?2:((x)<0xF4)?1:0) void sys_alsa_putmidimess(int portno, int a, int b, int c) { int channel = a&15; snd_seq_event_t ev; snd_seq_ev_clear(&ev); if (portno >= 0 && portno < alsa_nmidiout) { if (a >= 224) { // pitchbend snd_seq_ev_set_pitchbend(&ev,channel,CombineBytes(b,c)); } else if (a >= 208) { // touch snd_seq_ev_set_chanpress(&ev,channel,b); } else if (a >= 192) { // program snd_seq_ev_set_pgmchange(&ev,channel,b); } else if (a >= 176) { // controller snd_seq_ev_set_controller(&ev,channel,b,c); } else if (a >= 160) { // polytouch snd_seq_ev_set_keypress(&ev,channel,b,c); } else if (a >= 144) { // note channel = a-144; if (c) snd_seq_ev_set_noteon(&ev,channel,b,c); else snd_seq_ev_set_noteoff(&ev,channel,b,c); } snd_seq_ev_set_direct(&ev); snd_seq_ev_set_subs(&ev); snd_seq_ev_set_source(&ev,alsa_midioutfd[portno]); snd_seq_event_output_direct(midi_handle,&ev); } } void sys_alsa_putmidibyte(int portno, int byte) { snd_seq_event_t ev; snd_seq_ev_clear(&ev); if (portno >= 0 && portno < alsa_nmidiout) { // repack into 1 byte char and put somewhere to point at unsigned char data = (unsigned char)byte; snd_seq_ev_set_sysex(&ev,1,&data); //...set_variable *should* have worked but didn't snd_seq_ev_set_direct(&ev); snd_seq_ev_set_subs(&ev); snd_seq_ev_set_source(&ev,alsa_midioutfd[portno]); snd_seq_event_output_direct(midi_handle,&ev); } } /* this version uses the asynchronous "read()" ... */ void sys_alsa_poll_midi() { unsigned char buf[MAX_EVENT_SIZE]; int count, alsa_source; snd_seq_event_t *midievent = NULL; if (alsa_nmidiout == 0 && alsa_nmidiin == 0) return; snd_midi_event_init(midiev); if (!alsa_nmidiout && !alsa_nmidiin) return; count = snd_seq_event_input_pending(midi_handle,1); if (count != 0) count = snd_seq_event_input(midi_handle,&midievent); if (midievent != NULL) { count = snd_midi_event_decode(midiev,buf,sizeof(buf),midievent); alsa_source = midievent->dest.port; for(int i=0; i<count; i++) sys_midibytein(alsa_source, (buf[i] & 0xff)); //post("received %d midi bytes",count); } } void sys_alsa_close_midi() { alsa_nmidiin = alsa_nmidiout = 0; if(midi_handle) { snd_seq_close(midi_handle); if(midiev) snd_midi_event_free(midiev); } } #define NSEARCH 10 static int alsa_nmidiindevs, alsa_nmidioutdevs, alsa_initted; void midi_alsa_init() { if (alsa_initted) return; alsa_initted = 1; } void midi_alsa_getdevs(char *indevlist, int *nindevs, char *outdevlist, int *noutdevs, int maxndev, int devdescsize) { int ndev = min(maxndev,alsa_nmidiindevs); for (int i=0; i<ndev; i++) sprintf(indevlist + i * devdescsize, "ALSA MIDI device #%d", i+1); *nindevs = ndev; ndev = min(maxndev,alsa_nmidioutdevs); for (int i=0; i<ndev; i++) sprintf(outdevlist + i * devdescsize, "ALSA MIDI device #%d", i+1); *noutdevs = ndev; }