diff options
Diffstat (limited to 'src/sys/oss/midi-oss.c')
-rw-r--r-- | src/sys/oss/midi-oss.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/sys/oss/midi-oss.c b/src/sys/oss/midi-oss.c new file mode 100644 index 0000000..8d6f7ba --- /dev/null +++ b/src/sys/oss/midi-oss.c @@ -0,0 +1,177 @@ +/* + * Schism Tracker - a cross-platform Impulse Tracker clone + * copyright (c) 2003-2005 Storlek <storlek@rigelseven.com> + * copyright (c) 2005-2008 Mrs. Brisby <mrs.brisby@nimh.org> + * copyright (c) 2009 Storlek & Mrs. Brisby + * copyright (c) 2010-2012 Storlek + * URL: http://schismtracker.org/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + + +#include "headers.h" + +#include "midi.h" + +#include "util.h" + +#ifdef USE_OSS + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/soundcard.h> +#include <sys/poll.h> + +#include <errno.h> +#include <fcntl.h> + +/* this is stupid; oss doesn't have a concept of ports... */ +#define MAX_OSS_MIDI 64 + +#define MAX_MIDI_PORTS MAX_OSS_MIDI+2 +static int opened[MAX_MIDI_PORTS]; + + +static void _oss_send(struct midi_port *p, const unsigned char *data, unsigned int len, + UNUSED unsigned int delay) +{ + int fd, r, n; + fd = opened[ n = INT_SHAPED_PTR(p->userdata) ]; + if (fd < 0) return; + while (len > 0) { + r = write(fd, data, len); + if (r < -1 && errno == EINTR) continue; + if (r < 1) { + /* err, can't happen? */ + (void)close(opened[n]); + opened[n] = -1; + p->userdata = PTR_SHAPED_INT(-1); + p->io = 0; /* failure! */ + return; + } + data += r; + len -= r; + } +} + +static int _oss_start(UNUSED struct midi_port *p) { return 1; /* do nothing */ } +static int _oss_stop(UNUSED struct midi_port *p) { return 1; /* do nothing */ } + + +static int _oss_thread(struct midi_provider *p) +{ + struct pollfd pfd[MAX_MIDI_PORTS]; + struct midi_port *ptr, *src; + unsigned char midi_buf[4096]; + int i, j, r; + + for (;;) { + ptr = NULL; + j = 0; + while (midi_port_foreach(p, &ptr)) { + i = INT_SHAPED_PTR(ptr->userdata); + if (i == -1) continue; /* err... */ + if (!(ptr->io & MIDI_INPUT)) continue; + pfd[j].fd = i; + pfd[j].events = POLLIN; + pfd[j].revents = 0; /* RH 5 bug */ + j++; + } + if (!j || poll(pfd, j, -1) < 1) { + sleep(1); + continue; + } + for (i = 0; i < j; i++) { + if (!(pfd[i].revents & POLLIN)) continue; + do { + r = read(pfd[i].fd, midi_buf, sizeof(midi_buf)); + } while (r == -1 && errno == EINTR); + if (r > 0) { + ptr = src = NULL; + while (midi_port_foreach(p, &ptr)) { + if (INT_SHAPED_PTR(ptr->userdata) == pfd[i].fd) { + src = ptr; + } + } + midi_received_cb(src, midi_buf, r); + } + } + } + /* stupid gcc */ + return 0; +} + + +static void _tryopen(int n, const char *name, struct midi_provider *_oss_provider) +{ + int io; + char *ptr; + + if (opened[n+1] != -1) return; + opened[n+1] = open(name, O_RDWR|O_NOCTTY|O_NONBLOCK); + if (opened[n+1] == -1) { + opened[n+1] = open(name, O_RDONLY|O_NOCTTY|O_NONBLOCK); + if (opened[n+1] == -1) { + opened[n+1] = open(name, O_WRONLY|O_NOCTTY|O_NONBLOCK); + if (opened[n+1] == -1) return; + io = MIDI_OUTPUT; + } else { + io = MIDI_INPUT; + } + } else { + io = MIDI_INPUT | MIDI_OUTPUT; + } + + ptr = NULL; + if (asprintf(&ptr, " %-16s (OSS)", name) == -1) { + return; + } + midi_port_register(_oss_provider, io, ptr, PTR_SHAPED_INT((long)n+1), 0); + free(ptr); +} + +static void _oss_poll(struct midi_provider *_oss_provider) +{ + char sbuf[64]; + int i; + + _tryopen(-1, "/dev/midi", _oss_provider); + for (i = 0; i < MAX_OSS_MIDI; i++) { + sprintf(sbuf, "/dev/midi%d", i); + _tryopen(i, sbuf, _oss_provider); + + sprintf(sbuf, "/dev/midi%02d", i); + _tryopen(i, sbuf, _oss_provider); + } +} +int oss_midi_setup(void) +{ + static struct midi_driver driver; + int i; + + driver.flags = 0; + driver.poll = _oss_poll; + driver.thread = _oss_thread; + driver.enable = _oss_start; + driver.disable = _oss_stop; + driver.send = _oss_send; + + for (i = 0; i < MAX_MIDI_PORTS; i++) opened[i] = -1; + if (!midi_provider_register("OSS", &driver)) return 0; + return 1; +} +#endif |