1/*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26#define USE_ERROR
27#define USE_TRACE
28
29#if USE_PLATFORM_MIDI_IN == TRUE
30
31
32#include <alsa/asoundlib.h>
33#include "PlatformMidi.h"
34#include "PLATFORM_API_LinuxOS_ALSA_MidiUtils.h"
35#if defined(i586)
36#include <sys/utsname.h>
37#endif
38
39/*
40 * Helper methods
41 */
42
43static inline UINT32 packMessage(int status, int data1, int data2) {
44 return ((status & 0xFF) | ((data1 & 0xFF) << 8) | ((data2 & 0xFF) << 16));
45}
46
47
48static void setShortMessage(MidiMessage* message,
49 int status, int data1, int data2) {
50 message->type = SHORT_MESSAGE;
51 message->data.s.packedMsg = packMessage(status, data1, data2);
52}
53
54
55static void setRealtimeMessage(MidiMessage* message, int status) {
56 setShortMessage(message, status, 0, 0);
57}
58
59
60static void set14bitMessage(MidiMessage* message, int status, int value) {
61 TRACE3("14bit value: %d, lsb: %d, msb: %d\n", value, value & 0x7F, (value >> 7) & 0x7F);
62 value &= 0x3FFF;
63 TRACE3("14bit value (2): %d, lsb: %d, msb: %d\n", value, value & 0x7F, (value >> 7) & 0x7F);
64 setShortMessage(message, status,
65 value & 0x7F,
66 (value >> 7) & 0x7F);
67}
68
69
70/*
71 * implementation of the platform-dependent
72 * MIDI in functions declared in PlatformMidi.h
73 */
74
75char* MIDI_IN_GetErrorStr(INT32 err) {
76 return (char*) getErrorStr(err);
77}
78
79INT32 MIDI_IN_GetNumDevices() {
80/* Workaround for 6842956: 32bit app on 64bit linux
81 * gets assertion failure trying to open midiIn ports.
82 * Untill the issue is fixed in ALSA
83 * (https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4807)
84 * report no midi in devices in the configuration.
85 */
86#if defined(i586)
87 static int jre32onlinux64 = -1;
88 if (jre32onlinux64 < 0) {
89 jre32onlinux64 = 0;
90 /* The workaround may be disabled setting "JAVASOUND_ENABLE_MIDIIN"
91 * environment variable.
92 */
93 if (getenv("JAVASOUND_ENABLE_MIDIIN") == NULL) {
94 struct utsname u;
95 jre32onlinux64 = 0;
96 if (uname(&u) == 0) {
97 if (strstr(u.machine, "64") != NULL) {
98 TRACE0("jre32 on linux64 detected - report no midiIn devices\n");
99 jre32onlinux64 = 1;
100 }
101 }
102 }
103 }
104 if (jre32onlinux64) {
105 return 0;
106 }
107#endif
108
109 TRACE0("MIDI_IN_GetNumDevices()\n");
110
111 return getMidiDeviceCount(SND_RAWMIDI_STREAM_INPUT);
112}
113
114
115INT32 MIDI_IN_GetDeviceName(INT32 deviceIndex, char *name, UINT32 nameLength) {
116 int ret = getMidiDeviceName(SND_RAWMIDI_STREAM_INPUT, deviceIndex,
117 name, nameLength);
118 return ret;
119}
120
121
122INT32 MIDI_IN_GetDeviceVendor(INT32 deviceIndex, char *name, UINT32 nameLength) {
123 int ret = getMidiDeviceVendor(deviceIndex, name, nameLength);
124 return ret;
125}
126
127
128INT32 MIDI_IN_GetDeviceDescription(INT32 deviceIndex, char *name, UINT32 nameLength) {
129 int ret = getMidiDeviceDescription(SND_RAWMIDI_STREAM_INPUT, deviceIndex,
130 name, nameLength);
131 return ret;
132}
133
134
135INT32 MIDI_IN_GetDeviceVersion(INT32 deviceIndex, char *name, UINT32 nameLength) {
136 int ret = getMidiDeviceVersion(deviceIndex, name, nameLength);
137 return ret;
138}
139
140/*************************************************************************/
141
142INT32 MIDI_IN_OpenDevice(INT32 deviceIndex, MidiDeviceHandle** handle) {
143 INT32 ret;
144 TRACE0("> MIDI_IN_OpenDevice\n");
145 ret = openMidiDevice(SND_RAWMIDI_STREAM_INPUT, deviceIndex, handle);
146 TRACE1("< MIDI_IN_OpenDevice: returning %d\n", (int) ret);
147 return ret;
148}
149
150
151INT32 MIDI_IN_CloseDevice(MidiDeviceHandle* handle) {
152 INT32 ret;
153 TRACE0("> MIDI_IN_CloseDevice\n");
154 ret = closeMidiDevice(handle);
155 TRACE1("< MIDI_IN_CloseDevice: returning %d\n", (int) ret);
156 return ret;
157}
158
159
160INT32 MIDI_IN_StartDevice(MidiDeviceHandle* handle) {
161 TRACE0("MIDI_IN_StartDevice\n");
162 return MIDI_SUCCESS;
163}
164
165
166INT32 MIDI_IN_StopDevice(MidiDeviceHandle* handle) {
167 TRACE0("MIDI_IN_StopDevice\n");
168 return MIDI_SUCCESS;
169}
170
171
172INT64 MIDI_IN_GetTimeStamp(MidiDeviceHandle* handle) {
173 return getMidiTimestamp(handle);
174}
175
176
177/* read the next message from the queue */
178MidiMessage* MIDI_IN_GetMessage(MidiDeviceHandle* handle) {
179 snd_seq_event_t alsa_message;
180 MidiMessage* jdk_message;
181 int err;
182 char buffer[1];
183 int status;
184
185 TRACE0("> MIDI_IN_GetMessage\n");
186 if (!handle) {
187 ERROR0("< ERROR: MIDI_IN_GetMessage(): handle is NULL\n");
188 return NULL;
189 }
190 if (!handle->deviceHandle) {
191 ERROR0("< ERROR: MIDI_IN_GetMessage(): native handle is NULL\n");
192 return NULL;
193 }
194 if (!handle->platformData) {
195 ERROR0("< ERROR: MIDI_IN_GetMessage(): platformData is NULL\n");
196 return NULL;
197 }
198
199 /* For MIDI In, the device is left in non blocking mode. So if there is
200 no data from the device, snd_rawmidi_read() returns with -11 (EAGAIN).
201 This results in jumping back to the Java layer. */
202 while (TRUE) {
203 TRACE0("before snd_rawmidi_read()\n");
204 err = snd_rawmidi_read((snd_rawmidi_t*) handle->deviceHandle, buffer, 1);
205 TRACE0("after snd_rawmidi_read()\n");
206 if (err != 1) {
207 ERROR2("< ERROR: MIDI_IN_GetMessage(): snd_rawmidi_read() returned %d : %s\n", err, snd_strerror(err));
208 return NULL;
209 }
210 // printf("received byte: %d\n", buffer[0]);
211 err = snd_midi_event_encode_byte((snd_midi_event_t*) handle->platformData,
212 (int) buffer[0],
213 &alsa_message);
214 if (err == 1) {
215 break;
216 } else if (err < 0) {
217 ERROR1("< ERROR: MIDI_IN_GetMessage(): snd_midi_event_encode_byte() returned %d\n", err);
218 return NULL;
219 }
220 }
221 jdk_message = (MidiMessage*) calloc(sizeof(MidiMessage), 1);
222 if (!jdk_message) {
223 ERROR0("< ERROR: MIDI_IN_GetMessage(): out of memory\n");
224 return NULL;
225 }
226 // TODO: tra
227 switch (alsa_message.type) {
228 case SND_SEQ_EVENT_NOTEON:
229 case SND_SEQ_EVENT_NOTEOFF:
230 case SND_SEQ_EVENT_KEYPRESS:
231 status = (alsa_message.type == SND_SEQ_EVENT_KEYPRESS) ? 0xA0 :
232 (alsa_message.type == SND_SEQ_EVENT_NOTEON) ? 0x90 : 0x80;
233 status |= alsa_message.data.note.channel;
234 setShortMessage(jdk_message, status,
235 alsa_message.data.note.note,
236 alsa_message.data.note.velocity);
237 break;
238
239 case SND_SEQ_EVENT_CONTROLLER:
240 status = 0xB0 | alsa_message.data.control.channel;
241 setShortMessage(jdk_message, status,
242 alsa_message.data.control.param,
243 alsa_message.data.control.value);
244 break;
245
246 case SND_SEQ_EVENT_PGMCHANGE:
247 case SND_SEQ_EVENT_CHANPRESS:
248 status = (alsa_message.type == SND_SEQ_EVENT_PGMCHANGE) ? 0xC0 : 0xD0;
249 status |= alsa_message.data.control.channel;
250 setShortMessage(jdk_message, status,
251 alsa_message.data.control.value, 0);
252 break;
253
254 case SND_SEQ_EVENT_PITCHBEND:
255 status = 0xE0 | alsa_message.data.control.channel;
256 // $$mp 2003-09-23:
257 // possible hack to work around a bug in ALSA. Necessary for
258 // ALSA 0.9.2. May be fixed in newer versions of ALSA.
259 // alsa_message.data.control.value ^= 0x2000;
260 // TRACE1("pitchbend value: %d\n", alsa_message.data.control.value);
261 set14bitMessage(jdk_message, status,
262 alsa_message.data.control.value);
263 break;
264
265 /* System exclusive messages */
266
267 case SND_SEQ_EVENT_SYSEX:
268 jdk_message->type = LONG_MESSAGE;
269 jdk_message->data.l.size = alsa_message.data.ext.len;
270 jdk_message->data.l.data = malloc(alsa_message.data.ext.len);
271 if (jdk_message->data.l.data == NULL) {
272 ERROR0("< ERROR: MIDI_IN_GetMessage(): out of memory\n");
273 free(jdk_message);
274 jdk_message = NULL;
275 } else {
276 memcpy(jdk_message->data.l.data, alsa_message.data.ext.ptr, alsa_message.data.ext.len);
277 }
278 break;
279
280 /* System common messages */
281
282 case SND_SEQ_EVENT_QFRAME:
283 setShortMessage(jdk_message, 0xF1,
284 alsa_message.data.control.value & 0x7F, 0);
285 break;
286
287 case SND_SEQ_EVENT_SONGPOS:
288 set14bitMessage(jdk_message, 0xF2,
289 alsa_message.data.control.value);
290 break;
291
292 case SND_SEQ_EVENT_SONGSEL:
293 setShortMessage(jdk_message, 0xF3,
294 alsa_message.data.control.value & 0x7F, 0);
295 break;
296
297 case SND_SEQ_EVENT_TUNE_REQUEST:
298 setRealtimeMessage(jdk_message, 0xF6);
299 break;
300
301 /* System realtime messages */
302
303 case SND_SEQ_EVENT_CLOCK:
304 setRealtimeMessage(jdk_message, 0xF8);
305 break;
306
307 case SND_SEQ_EVENT_START:
308 setRealtimeMessage(jdk_message, 0xFA);
309 break;
310
311 case SND_SEQ_EVENT_CONTINUE:
312 setRealtimeMessage(jdk_message, 0xFB);
313 break;
314
315 case SND_SEQ_EVENT_STOP:
316 setRealtimeMessage(jdk_message, 0xFC);
317 break;
318
319 case SND_SEQ_EVENT_SENSING:
320 setRealtimeMessage(jdk_message, 0xFE);
321 break;
322
323 case SND_SEQ_EVENT_RESET:
324 setRealtimeMessage(jdk_message, 0xFF);
325 break;
326
327 default:
328 ERROR0("< ERROR: MIDI_IN_GetMessage(): unhandled ALSA MIDI message type\n");
329 free(jdk_message);
330 jdk_message = NULL;
331
332 }
333
334 // set timestamp
335 if (jdk_message != NULL) {
336 jdk_message->timestamp = getMidiTimestamp(handle);
337 }
338 TRACE1("< MIDI_IN_GetMessage: returning %p\n", jdk_message);
339 return jdk_message;
340}
341
342
343void MIDI_IN_ReleaseMessage(MidiDeviceHandle* handle, MidiMessage* msg) {
344 if (!msg) {
345 ERROR0("< ERROR: MIDI_IN_ReleaseMessage(): message is NULL\n");
346 return;
347 }
348 if (msg->type == LONG_MESSAGE && msg->data.l.data) {
349 free(msg->data.l.data);
350 }
351 free(msg);
352}
353
354#endif /* USE_PLATFORM_MIDI_IN */
355