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;
31 #define _DEBUGPRINT(STR) fprintf(stderr, STR);
33 #define _DEBUGPRINT(STR) ;
36 AlsaSeqMidiIO::AlsaSeqMidiIO (const std::string &name, const char *device, const bool input)
44 AlsaSeqMidiIO::~AlsaSeqMidiIO ()
53 AlsaSeqMidiIO::init (const char *device_name, const bool input)
55 if (snd_seq_open (&_seq, "hw",
56 input ? SND_SEQ_OPEN_INPUT : SND_SEQ_OPEN_OUTPUT, 0) < 0)
62 if (snd_seq_set_client_name (_seq, "Ardour")) {
63 _DEBUGPRINT("AlsaSeqMidiIO: cannot set client name.\n");
67 _port = snd_seq_create_simple_port (_seq, "port", SND_SEQ_PORT_CAP_NO_EXPORT |
68 (input ? SND_SEQ_PORT_CAP_WRITE : SND_SEQ_PORT_CAP_READ),
69 SND_SEQ_PORT_TYPE_APPLICATION);
72 _DEBUGPRINT("AlsaSeqMidiIO: cannot create port.\n");
76 _npfds = snd_seq_poll_descriptors_count (_seq, input ? POLLIN : POLLOUT);
78 _DEBUGPRINT("AlsaSeqMidiIO: no poll descriptor(s).\n");
81 _pfds = (struct pollfd*) malloc (_npfds * sizeof(struct pollfd));
82 snd_seq_poll_descriptors (_seq, _pfds, _npfds, input ? POLLIN : POLLOUT);
86 if (snd_seq_parse_address (_seq, &port, device_name) < 0) {
87 _DEBUGPRINT("AlsaSeqMidiIO: cannot resolve hardware port.\n");
92 if (snd_seq_connect_from (_seq, _port, port.client, port.port) < 0) {
93 _DEBUGPRINT("AlsaSeqMidiIO: cannot connect input port.\n");
97 if (snd_seq_connect_to (_seq, _port, port.client, port.port) < 0) {
98 _DEBUGPRINT("AlsaSeqMidiIO: cannot connect output port.\n");
103 snd_seq_nonblock(_seq, 1);
109 PBD::error << _("AlsaSeqMidiIO: Device initialization failed.") << endmsg;
110 snd_seq_close (_seq);
115 ///////////////////////////////////////////////////////////////////////////////
117 AlsaSeqMidiOut::AlsaSeqMidiOut (const std::string &name, const char *device)
118 : AlsaSeqMidiIO (name, device, false)
124 AlsaSeqMidiOut::main_process_thread ()
127 bool need_drain = false;
128 snd_midi_event_t *alsa_codec = NULL;
129 snd_midi_event_new (MaxAlsaMidiEventSize, &alsa_codec);
130 pthread_mutex_lock (&_notify_mutex);
132 bool have_data = false;
133 struct MidiEventHeader h(0,0);
134 uint8_t data[MaxAlsaMidiEventSize];
136 const uint32_t read_space = _rb->read_space();
138 if (read_space > sizeof(MidiEventHeader)) {
139 if (_rb->read ((uint8_t*)&h, sizeof(MidiEventHeader)) != sizeof(MidiEventHeader)) {
140 _DEBUGPRINT("AlsaSeqMidiOut: Garbled MIDI EVENT HEADER!!\n");
143 assert (read_space >= h.size);
144 if (h.size > MaxAlsaMidiEventSize) {
145 _rb->increment_read_idx (h.size);
146 _DEBUGPRINT("AlsaSeqMidiOut: MIDI event too large!\n");
149 if (_rb->read (&data[0], h.size) != h.size) {
150 _DEBUGPRINT("AlsaSeqMidiOut: Garbled MIDI EVENT DATA!!\n");
158 snd_seq_drain_output (_seq);
161 pthread_cond_wait (&_notify_ready, &_notify_mutex);
165 snd_seq_event_t alsa_event;
166 snd_seq_ev_clear (&alsa_event);
167 snd_midi_event_reset_encode (alsa_codec);
168 if (!snd_midi_event_encode (alsa_codec, data, h.size, &alsa_event)) {
169 PBD::error << _("AlsaSeqMidiOut: Invalid Midi Event.") << endmsg;
173 snd_seq_ev_set_source (&alsa_event, _port);
174 snd_seq_ev_set_subs (&alsa_event);
175 snd_seq_ev_set_direct (&alsa_event);
177 uint64_t now = g_get_monotonic_time();
178 while (h.time > now + 500) {
180 snd_seq_drain_output (_seq);
183 select_sleep(h.time - now);
185 now = g_get_monotonic_time();
189 int perr = poll (_pfds, _npfds, 10 /* ms */);
191 PBD::error << _("AlsaSeqMidiOut: Error polling device. Terminating Midi Thread.") << endmsg;
195 _DEBUGPRINT("AlsaSeqMidiOut: poll() timed out.\n");
199 ssize_t err = snd_seq_event_output(_seq, &alsa_event);
201 if ((err == -EAGAIN)) {
202 snd_seq_drain_output (_seq);
205 if (err == -EWOULDBLOCK) {
210 PBD::error << _("AlsaSeqMidiOut: write failed. Terminating Midi Thread.") << endmsg;
216 pthread_mutex_unlock (&_notify_mutex);
219 snd_midi_event_free(alsa_codec);
221 _DEBUGPRINT("AlsaSeqMidiOut: MIDI OUT THREAD STOPPED\n");
225 ///////////////////////////////////////////////////////////////////////////////
227 AlsaSeqMidiIn::AlsaSeqMidiIn (const std::string &name, const char *device)
228 : AlsaSeqMidiIO (name, device, true)
234 AlsaSeqMidiIn::main_process_thread ()
238 snd_midi_event_t *alsa_codec = NULL;
239 snd_midi_event_new (MaxAlsaMidiEventSize, &alsa_codec);
244 snd_seq_poll_descriptors (_seq, _pfds, _npfds, POLLIN);
245 int perr = poll (_pfds, _npfds, 100 /* ms */);
248 PBD::error << _("AlsaSeqMidiIn: Error polling device. Terminating Midi Thread.") << endmsg;
256 snd_seq_event_t *event;
257 uint64_t time = g_get_monotonic_time();
258 ssize_t err = snd_seq_event_input (_seq, &event);
260 #if EAGAIN == EWOULDBLOCK
261 if (err == -EAGAIN) {
263 if ((err == -EAGAIN) || (err == -EWOULDBLOCK)) {
268 if (err == -ENOSPC) {
269 PBD::error << _("AlsaSeqMidiIn: FIFO overrun.") << endmsg;
274 PBD::error << _("AlsaSeqMidiIn: read error. Terminating Midi") << endmsg;
278 uint8_t data[MaxAlsaMidiEventSize];
279 snd_midi_event_reset_decode (alsa_codec);
280 ssize_t size = snd_midi_event_decode (alsa_codec, data, sizeof(data), event);
283 queue_event (time, data, size);
285 do_poll = (0 == err);
289 snd_midi_event_free(alsa_codec);
291 _DEBUGPRINT("AlsaSeqMidiIn: MIDI IN THREAD STOPPED\n");