/[svn]/linuxsampler/trunk/src/mididriver/MidiInputDeviceAlsa.cpp
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Contents of /linuxsampler/trunk/src/mididriver/MidiInputDeviceAlsa.cpp

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Revision 157 - (show annotations) (download)
Tue Jun 29 00:50:38 2004 UTC (17 years, 2 months ago) by senkov
File size: 7263 byte(s)
* Removed/cleaned up some left over stuff
* Fixed midi port name parameter (no longer static)

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 * *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
11 * *
12 * This program is distributed in the hope that it will be useful, *
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15 * GNU General Public License for more details. *
16 * *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the Free Software *
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20 * MA 02111-1307 USA *
21 ***************************************************************************/
22
23 #include "MidiInputDeviceAlsa.h"
24 #include "MidiInputDeviceFactory.h"
25
26 namespace LinuxSampler {
27
28 REGISTER_MIDI_INPUT_DRIVER("Alsa",MidiInputDeviceAlsa);
29
30 MidiInputDeviceAlsa::MidiInputDeviceAlsa(std::map<String,String> Parameters) : MidiInputDevice(CreateParameters(Parameters)), Thread(true, 1, -1) {
31 if (snd_seq_open(&hAlsaSeq, "default", SND_SEQ_OPEN_INPUT, 0) < 0) {
32 throw MidiInputException("Error opening ALSA sequencer");
33 }
34 this->hAlsaSeqClient = snd_seq_client_id(hAlsaSeq);
35 snd_seq_set_client_name(hAlsaSeq, "LinuxSampler");
36 }
37
38 MidiInputDeviceAlsa::~MidiInputDeviceAlsa() {
39 snd_seq_close(hAlsaSeq);
40 }
41
42 MidiInputDeviceAlsa::MidiInputPortAlsa::MidiInputPortAlsa(MidiInputDeviceAlsa* pDevice, int alsaPort) : MidiInputPort(pDevice, alsaPort) {
43 Parameters["alsa_seq_bindings"] = new ParameterAlsaSeqBindings(this);
44 }
45
46 MidiInputDeviceAlsa::MidiInputPortAlsa::~MidiInputPortAlsa() {
47 snd_seq_delete_simple_port(pDevice->hAlsaSeq, portNumber);
48 }
49
50 MidiInputDeviceAlsa::MidiInputPortAlsa* MidiInputDeviceAlsa::CreateMidiPort() {
51 int alsaPort;
52 if ((alsaPort = snd_seq_create_simple_port(hAlsaSeq, "LinuxSampler",
53 SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE,
54 SND_SEQ_PORT_TYPE_APPLICATION)) < 0) {
55 throw MidiInputException("Error creating sequencer port");
56 }
57 return ( new MidiInputPortAlsa(this, alsaPort) );
58 }
59
60 void MidiInputDeviceAlsa::Listen() {
61 StartThread();
62 }
63
64 void MidiInputDeviceAlsa::StopListen() {
65 StopThread();
66 }
67
68 /**
69 * Connects this Alsa midi input device with an Alsa MIDI source.
70 *
71 * @param Client - Alsa sequencer client and port ID of a MIDI source
72 * (e.g. "64:0")
73 * @throws MidiInputException if connection cannot be established
74 */
75 void MidiInputDeviceAlsa::MidiInputPortAlsa::ConnectToAlsaMidiSource(const char* MidiSource) {
76 snd_seq_addr_t sender, dest;
77 snd_seq_port_subscribe_t* subs;
78 int hExtClient, hExtPort;
79
80 sscanf(MidiSource, "%d:%d", &hExtClient, &hExtPort);
81 sender.client = (char) hExtClient;
82 sender.port = (char) hExtPort;
83 dest.client = (char) pDevice->hAlsaSeqClient;
84 dest.port = (char) portNumber;
85 snd_seq_port_subscribe_alloca(&subs);
86 snd_seq_port_subscribe_set_sender(subs, &sender);
87 snd_seq_port_subscribe_set_dest(subs, &dest);
88 snd_seq_port_subscribe_set_queue(subs, 1);
89 snd_seq_port_subscribe_set_time_update(subs, 1);
90 snd_seq_port_subscribe_set_time_real(subs, 1);
91 if (snd_seq_subscribe_port(pDevice->hAlsaSeq, subs) < 0)
92 throw MidiInputException(String("Unable to connect to Alsa seq client \'") + MidiSource + "\' (" + snd_strerror(errno) + ")");
93 }
94
95 String MidiInputDeviceAlsa::Description() {
96 return "Advanced Linux Sound Architecture";
97 }
98
99 String MidiInputDeviceAlsa::Version() {
100 String s = "$Revision: 1.6 $";
101 return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword
102 }
103
104 std::map<String,DeviceCreationParameter*> MidiInputDeviceAlsa::CreateParameters(std::map<String,String> Parameters) {
105 std::map<String,DeviceCreationParameter*> result;
106 result["active"] = OptionalParameter<ParameterActive>::New(this, Parameters["active"]);
107 result["ports"] = OptionalParameter<ParameterPorts>::New(this, Parameters["ports"]);
108 return result;
109 }
110
111 int MidiInputDeviceAlsa::Main() {
112 int npfd;
113 struct pollfd* pfd;
114 snd_seq_event_t* ev;
115
116 npfd = snd_seq_poll_descriptors_count(hAlsaSeq, POLLIN);
117 pfd = (struct pollfd*) alloca(npfd * sizeof(struct pollfd));
118 snd_seq_poll_descriptors(hAlsaSeq, pfd, npfd, POLLIN);
119 while (true) {
120 if (poll(pfd, npfd, 100000) > 0) {
121 do {
122 snd_seq_event_input(hAlsaSeq, &ev);
123 int port = (int) ev->dest.port;
124 MidiInputPort* pMidiInputPort = Ports[port];
125
126 switch (ev->type) {
127 case SND_SEQ_EVENT_CONTROLLER:
128 pMidiInputPort->DispatchControlChange(ev->data.control.param, ev->data.control.value, ev->data.control.channel);
129 break;
130
131 case SND_SEQ_EVENT_PITCHBEND:
132 // fprintf(stderr, "Pitchbender event on Channel %2d: %5d \n",
133 // ev->data.control.channel, ev->data.control.value);
134 pMidiInputPort->DispatchPitchbend(ev->data.control.value, ev->data.control.channel);
135 break;
136
137 case SND_SEQ_EVENT_NOTEON:
138 if (ev->data.note.velocity != 0) {
139 pMidiInputPort->DispatchNoteOn(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel);
140 }
141 else {
142 pMidiInputPort->DispatchNoteOff(ev->data.note.note, 0, ev->data.control.channel);
143 }
144 break;
145
146 case SND_SEQ_EVENT_NOTEOFF:
147 pMidiInputPort->DispatchNoteOff(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel);
148 break;
149 }
150 snd_seq_free_event(ev);
151 } while (snd_seq_event_input_pending(hAlsaSeq, 0) > 0);
152 }
153 }
154 }
155
156 } // namespace LinuxSampler

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