aboutsummaryrefslogtreecommitdiff
path: root/pd/src/s_midi_alsa.c
blob: 6e9143b3f103dd48cb7b9da9c84daa0e28abefb3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/* 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 "m_pd.h"
#include "s_stuff.h"

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)
{
    unsigned short _14bit;
    _14bit = (unsigned short)Second;
    _14bit <<= 7;
    _14bit |= (unsigned short)First;
    return(_14bit);
}

void sys_alsa_do_open_midi(int nmidiin, int *midiinvec,
    int nmidiout, int *midioutvec)
{

    char portname[50];
    int err = 0;
    int client;
    int i;
    alsa_nmidiin = 0;
    alsa_nmidiout = 0;
    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;
    }
    for (i=0;i<nmidiout;i++)
    {
        int port;
        sprintf(portname,"Pure Data Midi-In %d",i+1);
        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);
        alsa_midiinfd[i] = port;        
        if (port < 0) goto error;        
    }

    for (i=0;i<nmidiin;i++)
    {
        int port;
        sprintf(portname,"Pure Data Midi-Out %d",i+1);
        port = snd_seq_create_simple_port(midi_handle,portname,  SND_SEQ_PORT_CAP_SUBS_READ |  SND_SEQ_PORT_CAP_READ, SND_SEQ_PORT_TYPE_APPLICATION);
        alsa_midioutfd[i] = port;       
        if (port < 0) goto error;        
    }
   
    if (nmidiout == 0 && nmidiin == 0) return;
    snd_seq_client_info_t *alsainfo;
    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(20,&midiev);
    alsa_nmidiout = nmidiout;
    alsa_nmidiin = nmidiin;
    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;
    snd_seq_event_t ev;
    snd_seq_ev_clear(&ev);
    if (portno >= 0 && portno < alsa_nmidiout)
    {
        if (a >= 224)   // pitchbend
        {
            channel = a-224;
            snd_seq_ev_set_pitchbend(&ev,channel,CombineBytes(b,c));
        }
        else if (a >= 208)      // touch
        {
            channel = a-208;
            snd_seq_ev_set_chanpress(&ev,channel,b);
        }
        else if (a >= 192)      // program
        {
            channel = a-192;
            snd_seq_ev_set_pgmchange(&ev,channel,b);
        }
        else if (a >= 176)      // controller
        {
            channel = a-176;
            snd_seq_ev_set_controller(&ev,channel,b,c);
        }
        else if (a >= 160)      // polytouch
        {
            channel = a-160;
            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);
    }
    //post("%d %d %d\n",a,b,c);
}

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;
        unsigned char *dataptr = malloc(1);
        memcpy(dataptr,&byte,1);

        snd_seq_ev_set_sysex(&ev,1,dataptr); //...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(void)
{
   char buf[20];
   int count, alsa_source;
   int i;
   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,20,midievent);
       alsa_source = midievent->dest.port;
       for(i=0;i<count;i++)
           sys_midibytein(alsa_source, (buf[i] & 0xff));
       //post("received %d midi bytes\n",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(void)     
{
    int i;
    if (alsa_initted)
        return;
    alsa_initted = 1;
}

void midi_alsa_getdevs(char *indevlist, int *nindevs,
    char *outdevlist, int *noutdevs, int maxndev, int devdescsize)
{
    int i, ndev;
    if ((ndev = alsa_nmidiindevs) > maxndev)
        ndev = maxndev;
    for (i = 0; i < ndev; i++)
        sprintf(indevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
    *nindevs = ndev;

    if ((ndev = alsa_nmidioutdevs) > maxndev)
        ndev = maxndev;
    for (i = 0; i < ndev; i++)
        sprintf(outdevlist + i * devdescsize, "ALSA MIDI device #%d", i+1);
    *noutdevs = ndev;
}