2 Copyright (C) 2004 Paul Davis
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.
24 #include <midi++/types.h>
25 #include <midi++/alsa_sequencer.h>
26 #include <midi++/port_request.h>
31 #define TR_FN() (cerr << __FUNCTION__ << endl)
32 #define TR_VAL(v) (cerr << __FILE__ " " << __LINE__ << " " #v "=" << v << endl)
44 ALSA_SequencerMidiPort::ALSA_SequencerMidiPort (PortRequest &req)
52 if (0 <= (err = CreatePorts (req)) &&
53 0 <= (err = snd_midi_event_new (1024, &decoder)) && // Length taken from ARDOUR::Session::midi_read ()
54 0 <= (err = snd_midi_event_new (64, &encoder))) { // Length taken from ARDOUR::Session::mmc_buffer
55 snd_midi_event_init (decoder);
56 snd_midi_event_init (encoder);
58 req.status = PortRequest::OK;
60 req.status = PortRequest::Unknown;
63 ALSA_SequencerMidiPort::~ALSA_SequencerMidiPort ()
66 snd_midi_event_free (decoder);
68 snd_midi_event_free (encoder);
73 int ALSA_SequencerMidiPort::selectable () const
76 if (0 <= snd_seq_poll_descriptors (seq, pfd, 1, POLLIN | POLLOUT)) {
82 int ALSA_SequencerMidiPort::write (byte *msg, size_t msglen)
87 snd_midi_event_reset_encode (encoder);
88 int nwritten = snd_midi_event_encode (encoder, msg, msglen, &SEv);
90 while (0 < nwritten) {
91 if (0 <= (R = snd_seq_event_output (seq, &SEv)) &&
92 0 <= (R = snd_seq_drain_output (seq))) {
93 bytes_written += nwritten;
94 totwritten += nwritten;
96 output_parser->raw_preparse (*output_parser, msg, nwritten);
97 for (int i = 0; i < nwritten; i++) {
98 output_parser->scanner (msg[i]);
100 output_parser->raw_postparse (*output_parser, msg, nwritten);
110 nwritten = snd_midi_event_encode (encoder, msg, msglen, &SEv);
121 int ALSA_SequencerMidiPort::read (byte *buf, size_t max)
126 if (0 <= (err = snd_seq_event_input (seq, &ev))) {
128 err = snd_midi_event_decode (decoder, buf, max, ev);
135 input_parser->raw_preparse (*input_parser, buf, err);
136 for (int i = 0; i < err; i++) {
137 input_parser->scanner (buf[i]);
139 input_parser->raw_postparse (*input_parser, buf, err);
142 return -ENOENT == err ? 0 : err;
145 int ALSA_SequencerMidiPort::CreatePorts (PortRequest &req)
148 if (0 <= (err = snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX,
149 (req.mode & O_NONBLOCK) ? SND_SEQ_NONBLOCK : 0))) {
150 snd_seq_set_client_name (seq, req.devname);
151 unsigned int caps = 0;
152 if (req.mode == O_WRONLY || req.mode == O_RDWR)
153 caps |= SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE;
154 if (req.mode == O_RDONLY || req.mode == O_RDWR)
155 caps |= SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ;
156 err = snd_seq_create_simple_port (seq, req.tagname, caps, SND_SEQ_PORT_TYPE_MIDI_GENERIC);
159 snd_seq_ev_clear (&SEv);
160 snd_seq_ev_set_source (&SEv, port_id);
161 snd_seq_ev_set_subs (&SEv);
162 snd_seq_ev_set_direct (&SEv);