drivers/midi/MidiInputDeviceAlsa.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2008 Christian Schoenebeck                       *
 *                                                                         *
 *   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 "MidiInputDeviceAlsa.h"
#include "MidiInputDeviceFactory.h"

#define perm_ok(pinfo,bits) ((snd_seq_port_info_get_capability(pinfo) & (bits)) == (bits))

namespace LinuxSampler {

// *************** ParameterName ***************
// *

    MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterName::ParameterName(MidiInputPort* pPort) throw (Exception) : MidiInputPort::ParameterName(pPort, "Port " + ToString(pPort->GetPortNumber())) {
        OnSetValue(ValueAsString()); // initialize port name
    }

    void MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterName::OnSetValue(String s) throw (Exception) {
        if (s.size() > 16) throw Exception("Name too long for ALSA MIDI input port (max. 16 characters)");
        snd_seq_port_info_t* hInfo;
        snd_seq_port_info_malloc(&hInfo);
        snd_seq_get_port_info(((MidiInputDeviceAlsa*)pPort->GetDevice())->hAlsaSeq, pPort->GetPortNumber(), hInfo);
        snd_seq_port_info_set_name(hInfo, s.c_str());
        snd_seq_set_port_info(((MidiInputDeviceAlsa*)pPort->GetDevice())->hAlsaSeq, pPort->GetPortNumber(), hInfo);
        snd_seq_port_info_free(hInfo);
    }


// *************** ParameterAlsaSeqBindings ***************
// *


    MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::ParameterAlsaSeqBindings(MidiInputPortAlsa* pPort) : DeviceRuntimeParameterStrings( std::vector<String>() ) {
        this->pPort = pPort;
    }

    String MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::Description() {
        return "Bindings to other Alsa sequencer clients";
    }
    bool MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::Fix() {
        return false;
    }

    std::vector<String> MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::PossibilitiesAsString() {
        std::vector<String> res;
        snd_seq_client_info_t* cinfo;
        snd_seq_port_info_t* pinfo;

        snd_seq_client_info_alloca(&cinfo);
        snd_seq_port_info_alloca(&pinfo);
        snd_seq_client_info_set_client(cinfo, -1);
        while (snd_seq_query_next_client(pPort->pDevice->hAlsaSeq, cinfo) >= 0) {
            snd_seq_port_info_set_client(pinfo, snd_seq_client_info_get_client(cinfo));
            snd_seq_port_info_set_port(pinfo, -1);
            while (snd_seq_query_next_port(pPort->pDevice->hAlsaSeq, pinfo) >= 0) {
                if (perm_ok(pinfo, SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ)) {
                        String seq_id = ToString(snd_seq_client_info_get_client(cinfo)) + ":" +
                                        ToString(snd_seq_port_info_get_port(pinfo));
                        res.push_back(seq_id);
                }
            }
        }

        return res;
    }

    void MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::OnSetValue(std::vector<String> vS) throw (Exception) {
        pPort->UnsubscribeAll();

        std::vector<String>::iterator iter = vS.begin();
        for (; iter != vS.end(); iter++) pPort->ConnectToAlsaMidiSource((*iter).c_str());
    }


// *************** ParameterAlsaSeqId ***************
// *

    MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::ParameterAlsaSeqId(MidiInputPortAlsa* pPort)
        : DeviceRuntimeParameterString(ToString(pPort->pDevice->hAlsaSeqClient) + ":" + ToString(pPort->portNumber)) {
    }

    String MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::Description() {
        return "ALSA Sequencer ID";
    }

    bool MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::Fix() {
        return true;
    }

    std::vector<String> MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::PossibilitiesAsString() {
        return std::vector<String>(); // nothing
    }

    void MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::OnSetValue(String s) {
        // not possible as parameter is 'fix'
    }


// *************** MidiInputPortAlsa ***************
// *

    MidiInputDeviceAlsa::MidiInputPortAlsa::MidiInputPortAlsa(MidiInputDeviceAlsa* pDevice) throw (MidiInputException) : MidiInputPort(pDevice, -1) {
        this->pDevice = pDevice;

        // create Alsa sequencer port
        int alsaPort = snd_seq_create_simple_port(pDevice->hAlsaSeq, "unnamed port",
                                                  SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE,
                                                  SND_SEQ_PORT_TYPE_APPLICATION);
        if (alsaPort < 0) throw MidiInputException("Error creating sequencer port");
        this->portNumber = alsaPort;

        delete Parameters["NAME"];
        Parameters["NAME"]              = new ParameterName(this);
        Parameters["ALSA_SEQ_BINDINGS"] = new ParameterAlsaSeqBindings(this);
        Parameters["ALSA_SEQ_ID"]       = new ParameterAlsaSeqId(this);
    }

    MidiInputDeviceAlsa::MidiInputPortAlsa::~MidiInputPortAlsa() {
        UnsubscribeAll();
        snd_seq_delete_simple_port(pDevice->hAlsaSeq, portNumber);
    }

    /**
     * Connects this Alsa midi input device with an Alsa MIDI source.
     *
     * @param Client - Alsa sequencer client and port ID of a MIDI source
     *                (e.g. "64:0")
     * @throws MidiInputException  if connection cannot be established
     */
    void MidiInputDeviceAlsa::MidiInputPortAlsa::ConnectToAlsaMidiSource(const char* MidiSource) {
        snd_seq_addr_t sender, dest;
        snd_seq_port_subscribe_t* subs;
        int hExtClient, hExtPort;

        sscanf(MidiSource, "%d:%d", &hExtClient, &hExtPort);
        sender.client = (char) hExtClient;
        sender.port   = (char) hExtPort;
        dest.client   = (char) pDevice->hAlsaSeqClient;
        dest.port     = (char) portNumber;
        snd_seq_port_subscribe_malloc(&subs);
        snd_seq_port_subscribe_set_sender(subs, &sender);
        snd_seq_port_subscribe_set_dest(subs, &dest);
        snd_seq_port_subscribe_set_queue(subs, 1);
        snd_seq_port_subscribe_set_time_update(subs, 1);
        snd_seq_port_subscribe_set_time_real(subs, 1);
        if (snd_seq_subscribe_port(pDevice->hAlsaSeq, subs) < 0) {
            snd_seq_port_subscribe_free(subs);
            throw MidiInputException(String("Unable to connect to Alsa seq client \'") + MidiSource + "\' (" + snd_strerror(errno) + ")");
        }

        subscriptions.push_back(subs);
    }

    void MidiInputDeviceAlsa::MidiInputPortAlsa::UnsubscribeAll() {
        for (std::vector<snd_seq_port_subscribe_t*>::iterator it = subscriptions.begin();
             it != subscriptions.end(); it++) {
            if (snd_seq_unsubscribe_port(pDevice->hAlsaSeq, *it)) {
                dmsg(1,("MidiInputPortAlsa::UnsubscribeAll: Can't unsubscribe port connection!.\n"));
            }
            snd_seq_port_subscribe_free(*it);
        }
        subscriptions.clear();
    }

// *************** MidiInputDeviceAlsa ***************
// *

    MidiInputDeviceAlsa::MidiInputDeviceAlsa(std::map<String,DeviceCreationParameter*> Parameters, void* pSampler) : MidiInputDevice(Parameters, pSampler), Thread(true, true, 1, -1) {
        if (snd_seq_open(&hAlsaSeq, "default", SND_SEQ_OPEN_INPUT, 0) < 0) {
            throw MidiInputException("Error opening ALSA sequencer");
        }
        this->hAlsaSeqClient = snd_seq_client_id(hAlsaSeq);
        snd_seq_set_client_name(hAlsaSeq, "LinuxSampler");
        AcquirePorts(((DeviceCreationParameterInt*)Parameters["PORTS"])->ValueAsInt());
        if (((DeviceCreationParameterBool*)Parameters["ACTIVE"])->ValueAsBool()) {
                Listen();
        }
    }

    MidiInputDeviceAlsa::~MidiInputDeviceAlsa() {
        // free the midi ports (we can't let the base class do this,
        // as the MidiInputPortAlsa destructors need access to
        // hAlsaSeq)
        for (std::map<int,MidiInputPort*>::iterator iter = Ports.begin(); iter != Ports.end() ; iter++) {
            delete static_cast<MidiInputPortAlsa*>(iter->second);
        }
        Ports.clear();

        snd_seq_close(hAlsaSeq);
    }

    MidiInputDeviceAlsa::MidiInputPortAlsa* MidiInputDeviceAlsa::CreateMidiPort() {
        return new MidiInputPortAlsa(this);
    }

    String MidiInputDeviceAlsa::Name() {
            return "ALSA";
    }

    String MidiInputDeviceAlsa::Driver() {
            return Name();
    }

    void MidiInputDeviceAlsa::Listen() {
        StartThread();
    }

    void MidiInputDeviceAlsa::StopListen() {
        StopThread();
    }

    String MidiInputDeviceAlsa::Description() {
            return "Advanced Linux Sound Architecture";
    }

    String MidiInputDeviceAlsa::Version() {
            String s = "$Revision: 1.23 $";
            return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword
    }

    int MidiInputDeviceAlsa::Main() {
        int npfd;
        struct pollfd* pfd;
        snd_seq_event_t* ev;

        npfd = snd_seq_poll_descriptors_count(hAlsaSeq, POLLIN);
        pfd = (struct pollfd*) alloca(npfd * sizeof(struct pollfd));
        snd_seq_poll_descriptors(hAlsaSeq, pfd, npfd, POLLIN);
        while (true) {
            if (poll(pfd, npfd, 100000) > 0) {
                do {
                    snd_seq_event_input(hAlsaSeq, &ev);
                    int port = (int) ev->dest.port;
                    MidiInputPort* pMidiInputPort = Ports[port];

                    switch (ev->type) {
                        case SND_SEQ_EVENT_CONTROLLER:
                            if (ev->data.control.param == 0)
                                pMidiInputPort->DispatchBankSelectMsb(ev->data.control.value, ev->data.control.channel);
                            else if (ev->data.control.param == 32)
                                pMidiInputPort->DispatchBankSelectLsb(ev->data.control.value, ev->data.control.channel);
                            pMidiInputPort->DispatchControlChange(ev->data.control.param, ev->data.control.value, ev->data.control.channel);
                            break;

                        case SND_SEQ_EVENT_CHANPRESS:
                            pMidiInputPort->DispatchControlChange(128, ev->data.control.value, ev->data.control.channel);
                            break;

                        case SND_SEQ_EVENT_PITCHBEND:
                            pMidiInputPort->DispatchPitchbend(ev->data.control.value, ev->data.control.channel);
                            break;

                        case SND_SEQ_EVENT_NOTEON:
                            if (ev->data.note.velocity != 0) {
                                pMidiInputPort->DispatchNoteOn(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel);
                            }
                            else {
                                pMidiInputPort->DispatchNoteOff(ev->data.note.note, 0, ev->data.control.channel);
                            }
                            break;

                        case SND_SEQ_EVENT_NOTEOFF:
                            pMidiInputPort->DispatchNoteOff(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel);
                            break;

                        case SND_SEQ_EVENT_SYSEX:
                            pMidiInputPort->DispatchSysex(ev->data.ext.ptr, ev->data.ext.len);
                            break;

                        case SND_SEQ_EVENT_PGMCHANGE:
                            pMidiInputPort->DispatchProgramChange(ev->data.control.value, ev->data.control.channel);
                            break;
                    }
                    snd_seq_free_event(ev);
                } while (snd_seq_event_input_pending(hAlsaSeq, 0) > 0);
            }
        }
        // just to avoid a compiler warning
        return EXIT_FAILURE;
    }

} // namespace LinuxSampler
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 - 2008 Christian Schoenebeck *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this program; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#include "MidiInputDeviceAlsa.h"
25	#include "MidiInputDeviceFactory.h"
26
27	#define perm_ok(pinfo,bits) ((snd_seq_port_info_get_capability(pinfo) & (bits)) == (bits))
28
29	namespace LinuxSampler {
30
31	// ************* ParameterName *************
32	// *
33
34	MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterName::ParameterName(MidiInputPort* pPort) throw (Exception) : MidiInputPort::ParameterName(pPort, "Port " + ToString(pPort->GetPortNumber())) {
35	OnSetValue(ValueAsString()); // initialize port name
36	}
37
38	void MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterName::OnSetValue(String s) throw (Exception) {
39	if (s.size() > 16) throw Exception("Name too long for ALSA MIDI input port (max. 16 characters)");
40	snd_seq_port_info_t* hInfo;
41	snd_seq_port_info_malloc(&hInfo);
42	snd_seq_get_port_info(((MidiInputDeviceAlsa*)pPort->GetDevice())->hAlsaSeq, pPort->GetPortNumber(), hInfo);
43	snd_seq_port_info_set_name(hInfo, s.c_str());
44	snd_seq_set_port_info(((MidiInputDeviceAlsa*)pPort->GetDevice())->hAlsaSeq, pPort->GetPortNumber(), hInfo);
45	snd_seq_port_info_free(hInfo);
46	}
47
48
49
50	// ************* ParameterAlsaSeqBindings *************
51	// *
52
53
54	MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::ParameterAlsaSeqBindings(MidiInputPortAlsa* pPort) : DeviceRuntimeParameterStrings( std::vector<String>() ) {
55	this->pPort = pPort;
56	}
57
58	String MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::Description() {
59	return "Bindings to other Alsa sequencer clients";
60	}
61	bool MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::Fix() {
62	return false;
63	}
64
65	std::vector<String> MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::PossibilitiesAsString() {
66	std::vector<String> res;
67	snd_seq_client_info_t* cinfo;
68	snd_seq_port_info_t* pinfo;
69
70	snd_seq_client_info_alloca(&cinfo);
71	snd_seq_port_info_alloca(&pinfo);
72	snd_seq_client_info_set_client(cinfo, -1);
73	while (snd_seq_query_next_client(pPort->pDevice->hAlsaSeq, cinfo) >= 0) {
74	snd_seq_port_info_set_client(pinfo, snd_seq_client_info_get_client(cinfo));
75	snd_seq_port_info_set_port(pinfo, -1);
76	while (snd_seq_query_next_port(pPort->pDevice->hAlsaSeq, pinfo) >= 0) {
77	if (perm_ok(pinfo, SND_SEQ_PORT_CAP_READ\|SND_SEQ_PORT_CAP_SUBS_READ)) {
78	String seq_id = ToString(snd_seq_client_info_get_client(cinfo)) + ":" +
79	ToString(snd_seq_port_info_get_port(pinfo));
80	res.push_back(seq_id);
81	}
82	}
83	}
84
85	return res;
86	}
87
88	void MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqBindings::OnSetValue(std::vector<String> vS) throw (Exception) {
89	pPort->UnsubscribeAll();
90
91	std::vector<String>::iterator iter = vS.begin();
92	for (; iter != vS.end(); iter++) pPort->ConnectToAlsaMidiSource((*iter).c_str());
93	}
94
95
96
97	// ************* ParameterAlsaSeqId *************
98	// *
99
100	MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::ParameterAlsaSeqId(MidiInputPortAlsa* pPort)
101	: DeviceRuntimeParameterString(ToString(pPort->pDevice->hAlsaSeqClient) + ":" + ToString(pPort->portNumber)) {
102	}
103
104	String MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::Description() {
105	return "ALSA Sequencer ID";
106	}
107
108	bool MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::Fix() {
109	return true;
110	}
111
112	std::vector<String> MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::PossibilitiesAsString() {
113	return std::vector<String>(); // nothing
114	}
115
116	void MidiInputDeviceAlsa::MidiInputPortAlsa::ParameterAlsaSeqId::OnSetValue(String s) {
117	// not possible as parameter is 'fix'
118	}
119
120
121
122	// ************* MidiInputPortAlsa *************
123	// *
124
125	MidiInputDeviceAlsa::MidiInputPortAlsa::MidiInputPortAlsa(MidiInputDeviceAlsa* pDevice) throw (MidiInputException) : MidiInputPort(pDevice, -1) {
126	this->pDevice = pDevice;
127
128	// create Alsa sequencer port
129	int alsaPort = snd_seq_create_simple_port(pDevice->hAlsaSeq, "unnamed port",
130	SND_SEQ_PORT_CAP_WRITE\|SND_SEQ_PORT_CAP_SUBS_WRITE,
131	SND_SEQ_PORT_TYPE_APPLICATION);
132	if (alsaPort < 0) throw MidiInputException("Error creating sequencer port");
133	this->portNumber = alsaPort;
134
135	delete Parameters["NAME"];
136	Parameters["NAME"] = new ParameterName(this);
137	Parameters["ALSA_SEQ_BINDINGS"] = new ParameterAlsaSeqBindings(this);
138	Parameters["ALSA_SEQ_ID"] = new ParameterAlsaSeqId(this);
139	}
140
141	MidiInputDeviceAlsa::MidiInputPortAlsa::~MidiInputPortAlsa() {
142	UnsubscribeAll();
143	snd_seq_delete_simple_port(pDevice->hAlsaSeq, portNumber);
144	}
145
146	/**
147	* Connects this Alsa midi input device with an Alsa MIDI source.
148	*
149	* @param Client - Alsa sequencer client and port ID of a MIDI source
150	* (e.g. "64:0")
151	* @throws MidiInputException if connection cannot be established
152	*/
153	void MidiInputDeviceAlsa::MidiInputPortAlsa::ConnectToAlsaMidiSource(const char* MidiSource) {
154	snd_seq_addr_t sender, dest;
155	snd_seq_port_subscribe_t* subs;
156	int hExtClient, hExtPort;
157
158	sscanf(MidiSource, "%d:%d", &hExtClient, &hExtPort);
159	sender.client = (char) hExtClient;
160	sender.port = (char) hExtPort;
161	dest.client = (char) pDevice->hAlsaSeqClient;
162	dest.port = (char) portNumber;
163	snd_seq_port_subscribe_malloc(&subs);
164	snd_seq_port_subscribe_set_sender(subs, &sender);
165	snd_seq_port_subscribe_set_dest(subs, &dest);
166	snd_seq_port_subscribe_set_queue(subs, 1);
167	snd_seq_port_subscribe_set_time_update(subs, 1);
168	snd_seq_port_subscribe_set_time_real(subs, 1);
169	if (snd_seq_subscribe_port(pDevice->hAlsaSeq, subs) < 0) {
170	snd_seq_port_subscribe_free(subs);
171	throw MidiInputException(String("Unable to connect to Alsa seq client \'") + MidiSource + "\' (" + snd_strerror(errno) + ")");
172	}
173
174	subscriptions.push_back(subs);
175	}
176
177	void MidiInputDeviceAlsa::MidiInputPortAlsa::UnsubscribeAll() {
178	for (std::vector<snd_seq_port_subscribe_t*>::iterator it = subscriptions.begin();
179	it != subscriptions.end(); it++) {
180	if (snd_seq_unsubscribe_port(pDevice->hAlsaSeq, *it)) {
181	dmsg(1,("MidiInputPortAlsa::UnsubscribeAll: Can't unsubscribe port connection!.\n"));
182	}
183	snd_seq_port_subscribe_free(*it);
184	}
185	subscriptions.clear();
186	}
187
188	// ************* MidiInputDeviceAlsa *************
189	// *
190
191	MidiInputDeviceAlsa::MidiInputDeviceAlsa(std::map<String,DeviceCreationParameter> Parameters, void pSampler) : MidiInputDevice(Parameters, pSampler), Thread(true, true, 1, -1) {
192	if (snd_seq_open(&hAlsaSeq, "default", SND_SEQ_OPEN_INPUT, 0) < 0) {
193	throw MidiInputException("Error opening ALSA sequencer");
194	}
195	this->hAlsaSeqClient = snd_seq_client_id(hAlsaSeq);
196	snd_seq_set_client_name(hAlsaSeq, "LinuxSampler");
197	AcquirePorts(((DeviceCreationParameterInt*)Parameters["PORTS"])->ValueAsInt());
198	if (((DeviceCreationParameterBool*)Parameters["ACTIVE"])->ValueAsBool()) {
199	Listen();
200	}
201	}
202
203	MidiInputDeviceAlsa::~MidiInputDeviceAlsa() {
204	// free the midi ports (we can't let the base class do this,
205	// as the MidiInputPortAlsa destructors need access to
206	// hAlsaSeq)
207	for (std::map<int,MidiInputPort*>::iterator iter = Ports.begin(); iter != Ports.end() ; iter++) {
208	delete static_cast<MidiInputPortAlsa*>(iter->second);
209	}
210	Ports.clear();
211
212	snd_seq_close(hAlsaSeq);
213	}
214
215	MidiInputDeviceAlsa::MidiInputPortAlsa* MidiInputDeviceAlsa::CreateMidiPort() {
216	return new MidiInputPortAlsa(this);
217	}
218
219	String MidiInputDeviceAlsa::Name() {
220	return "ALSA";
221	}
222
223	String MidiInputDeviceAlsa::Driver() {
224	return Name();
225	}
226
227	void MidiInputDeviceAlsa::Listen() {
228	StartThread();
229	}
230
231	void MidiInputDeviceAlsa::StopListen() {
232	StopThread();
233	}
234
235	String MidiInputDeviceAlsa::Description() {
236	return "Advanced Linux Sound Architecture";
237	}
238
239	String MidiInputDeviceAlsa::Version() {
240	String s = "$Revision: 1.23 $";
241	return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword
242	}
243
244	int MidiInputDeviceAlsa::Main() {
245	int npfd;
246	struct pollfd* pfd;
247	snd_seq_event_t* ev;
248
249	npfd = snd_seq_poll_descriptors_count(hAlsaSeq, POLLIN);
250	pfd = (struct pollfd) alloca(npfd sizeof(struct pollfd));
251	snd_seq_poll_descriptors(hAlsaSeq, pfd, npfd, POLLIN);
252	while (true) {
253	if (poll(pfd, npfd, 100000) > 0) {
254	do {
255	snd_seq_event_input(hAlsaSeq, &ev);
256	int port = (int) ev->dest.port;
257	MidiInputPort* pMidiInputPort = Ports[port];
258
259	switch (ev->type) {
260	case SND_SEQ_EVENT_CONTROLLER:
261	if (ev->data.control.param == 0)
262	pMidiInputPort->DispatchBankSelectMsb(ev->data.control.value, ev->data.control.channel);
263	else if (ev->data.control.param == 32)
264	pMidiInputPort->DispatchBankSelectLsb(ev->data.control.value, ev->data.control.channel);
265	pMidiInputPort->DispatchControlChange(ev->data.control.param, ev->data.control.value, ev->data.control.channel);
266	break;
267
268	case SND_SEQ_EVENT_CHANPRESS:
269	pMidiInputPort->DispatchControlChange(128, ev->data.control.value, ev->data.control.channel);
270	break;
271
272	case SND_SEQ_EVENT_PITCHBEND:
273	pMidiInputPort->DispatchPitchbend(ev->data.control.value, ev->data.control.channel);
274	break;
275
276	case SND_SEQ_EVENT_NOTEON:
277	if (ev->data.note.velocity != 0) {
278	pMidiInputPort->DispatchNoteOn(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel);
279	}
280	else {
281	pMidiInputPort->DispatchNoteOff(ev->data.note.note, 0, ev->data.control.channel);
282	}
283	break;
284
285	case SND_SEQ_EVENT_NOTEOFF:
286	pMidiInputPort->DispatchNoteOff(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel);
287	break;
288
289	case SND_SEQ_EVENT_SYSEX:
290	pMidiInputPort->DispatchSysex(ev->data.ext.ptr, ev->data.ext.len);
291	break;
292
293	case SND_SEQ_EVENT_PGMCHANGE:
294	pMidiInputPort->DispatchProgramChange(ev->data.control.value, ev->data.control.channel);
295	break;
296	}
297	snd_seq_free_event(ev);
298	} while (snd_seq_event_input_pending(hAlsaSeq, 0) > 0);
299	}
300	}
301	// just to avoid a compiler warning
302	return EXIT_FAILURE;
303	}
304
305	} // namespace LinuxSampler