2 * Copyright (C) 2014 Robin Gareus <robin@gareus.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "select_sleep.h"
23 #include "alsa_sequencer.h"
25 #include "pbd/error.h"
28 using namespace ARDOUR;
30 /* max bytes per individual midi-event
31 * events larger than this are ignored */
32 #define MaxAlsaSeqEventSize (64)
35 #define _DEBUGPRINT(STR) fprintf(stderr, STR);
37 #define _DEBUGPRINT(STR) ;
40 AlsaSeqMidiIO::AlsaSeqMidiIO (const char *device, const bool input)
47 AlsaSeqMidiIO::~AlsaSeqMidiIO ()
56 AlsaSeqMidiIO::init (const char *device_name, const bool input)
58 if (snd_seq_open (&_seq, "hw",
59 input ? SND_SEQ_OPEN_INPUT : SND_SEQ_OPEN_OUTPUT, 0) < 0)
65 if (snd_seq_set_client_name (_seq, "Ardour")) {
66 _DEBUGPRINT("AlsaSeqMidiIO: cannot set client name.\n");
70 _port = snd_seq_create_simple_port (_seq, "port", SND_SEQ_PORT_CAP_NO_EXPORT |
71 (input ? SND_SEQ_PORT_CAP_WRITE : SND_SEQ_PORT_CAP_READ),
72 SND_SEQ_PORT_TYPE_APPLICATION);
75 _DEBUGPRINT("AlsaSeqMidiIO: cannot create port.\n");
79 _npfds = snd_seq_poll_descriptors_count (_seq, input ? POLLIN : POLLOUT);
81 _DEBUGPRINT("AlsaSeqMidiIO: no poll descriptor(s).\n");
84 _pfds = (struct pollfd*) malloc (_npfds * sizeof(struct pollfd));
85 snd_seq_poll_descriptors (_seq, _pfds, _npfds, input ? POLLIN : POLLOUT);
89 if (snd_seq_parse_address (_seq, &port, device_name) < 0) {
90 _DEBUGPRINT("AlsaSeqMidiIO: cannot resolve hardware port.\n");
95 if (snd_seq_connect_from (_seq, _port, port.client, port.port) < 0) {
96 _DEBUGPRINT("AlsaSeqMidiIO: cannot connect input port.\n");
100 if (snd_seq_connect_to (_seq, _port, port.client, port.port) < 0) {
101 _DEBUGPRINT("AlsaSeqMidiIO: cannot connect output port.\n");
106 snd_seq_nonblock(_seq, 1);
112 PBD::error << _("AlsaSeqMidiIO: Device initialization failed.") << endmsg;
113 snd_seq_close (_seq);
118 ///////////////////////////////////////////////////////////////////////////////
120 AlsaSeqMidiOut::AlsaSeqMidiOut (const char *device)
121 : AlsaSeqMidiIO (device, false)
127 AlsaSeqMidiOut::main_process_thread ()
130 bool need_drain = false;
131 snd_midi_event_t *alsa_codec = NULL;
132 snd_midi_event_new (MaxAlsaSeqEventSize, &alsa_codec);
133 pthread_mutex_lock (&_notify_mutex);
135 bool have_data = false;
136 struct MidiEventHeader h(0,0);
137 uint8_t data[MaxAlsaSeqEventSize];
139 const uint32_t read_space = _rb->read_space();
141 if (read_space > sizeof(MidiEventHeader)) {
142 if (_rb->read ((uint8_t*)&h, sizeof(MidiEventHeader)) != sizeof(MidiEventHeader)) {
143 _DEBUGPRINT("AlsaSeqMidiOut: Garbled MIDI EVENT HEADER!!\n");
146 assert (read_space >= h.size);
147 if (h.size > MaxAlsaSeqEventSize) {
148 _rb->increment_read_idx (h.size);
149 _DEBUGPRINT("AlsaSeqMidiOut: MIDI event too large!\n");
152 if (_rb->read (&data[0], h.size) != h.size) {
153 _DEBUGPRINT("AlsaSeqMidiOut: Garbled MIDI EVENT DATA!!\n");
161 snd_seq_drain_output (_seq);
164 pthread_cond_wait (&_notify_ready, &_notify_mutex);
168 snd_seq_event_t alsa_event;
169 snd_seq_ev_clear (&alsa_event);
170 snd_midi_event_reset_encode (alsa_codec);
171 if (!snd_midi_event_encode (alsa_codec, data, h.size, &alsa_event)) {
172 PBD::error << _("AlsaSeqMidiOut: Invalid Midi Event.") << endmsg;
176 snd_seq_ev_set_source (&alsa_event, _port);
177 snd_seq_ev_set_subs (&alsa_event);
178 snd_seq_ev_set_direct (&alsa_event);
180 uint64_t now = g_get_monotonic_time();
181 while (h.time > now + 500) {
183 snd_seq_drain_output (_seq);
186 select_sleep(h.time - now);
188 now = g_get_monotonic_time();
192 int perr = poll (_pfds, _npfds, 10 /* ms */);
194 PBD::error << _("AlsaSeqMidiOut: Error polling device. Terminating Midi Thread.") << endmsg;
198 _DEBUGPRINT("AlsaSeqMidiOut: poll() timed out.\n");
202 ssize_t err = snd_seq_event_output(_seq, &alsa_event);
204 if ((err == -EAGAIN)) {
205 snd_seq_drain_output (_seq);
208 if (err == -EWOULDBLOCK) {
213 PBD::error << _("AlsaSeqMidiOut: write failed. Terminating Midi Thread.") << endmsg;
219 pthread_mutex_unlock (&_notify_mutex);
222 snd_midi_event_free(alsa_codec);
224 _DEBUGPRINT("AlsaSeqMidiOut: MIDI OUT THREAD STOPPED\n");
228 ///////////////////////////////////////////////////////////////////////////////
230 AlsaSeqMidiIn::AlsaSeqMidiIn (const char *device)
231 : AlsaSeqMidiIO (device, true)
237 AlsaSeqMidiIn::main_process_thread ()
241 snd_midi_event_t *alsa_codec = NULL;
242 snd_midi_event_new (MaxAlsaSeqEventSize, &alsa_codec);
247 snd_seq_poll_descriptors (_seq, _pfds, _npfds, POLLIN);
248 int perr = poll (_pfds, _npfds, 100 /* ms */);
251 PBD::error << _("AlsaSeqMidiIn: Error polling device. Terminating Midi Thread.") << endmsg;
259 snd_seq_event_t *event;
260 uint64_t time = g_get_monotonic_time();
261 ssize_t err = snd_seq_event_input (_seq, &event);
263 if ((err == -EAGAIN) || (err == -EWOULDBLOCK)) {
267 if (err == -ENOSPC) {
268 PBD::error << _("AlsaSeqMidiIn: FIFO overrun.") << endmsg;
273 PBD::error << _("AlsaSeqMidiIn: read error. Terminating Midi") << endmsg;
277 uint8_t data[MaxAlsaSeqEventSize];
278 snd_midi_event_reset_decode (alsa_codec);
279 ssize_t size = snd_midi_event_decode (alsa_codec, data, sizeof(data), event);
282 queue_event (time, data, size);
284 do_poll = (0 == err);
288 snd_midi_event_free(alsa_codec);
290 _DEBUGPRINT("AlsaSeqMidiIn: MIDI IN THREAD STOPPED\n");