1 |
/*************************************************************************** |
2 |
* * |
3 |
* LinuxSampler - modular, streaming capable sampler * |
4 |
* * |
5 |
* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
6 |
* Copyright (C) 2005 - 2020 Christian Schoenebeck * |
7 |
* Copyright (C) 2009 - 2012 Grigor Iliev * |
8 |
* Copyright (C) 2013 - 2016 Andreas Persson * |
9 |
* * |
10 |
* This program is free software; you can redistribute it and/or modify * |
11 |
* it under the terms of the GNU General Public License as published by * |
12 |
* the Free Software Foundation; either version 2 of the License, or * |
13 |
* (at your option) any later version. * |
14 |
* * |
15 |
* This program is distributed in the hope that it will be useful, * |
16 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
17 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
18 |
* GNU General Public License for more details. * |
19 |
* * |
20 |
* You should have received a copy of the GNU General Public License * |
21 |
* along with this program; if not, write to the Free Software * |
22 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
23 |
* MA 02111-1307 USA * |
24 |
***************************************************************************/ |
25 |
|
26 |
#ifndef __LS_DISKTHREADBASE_H__ |
27 |
#define __LS_DISKTHREADBASE_H__ |
28 |
|
29 |
#include <map> |
30 |
|
31 |
#include "StreamBase.h" |
32 |
#include "../EngineChannel.h" |
33 |
#include "../InstrumentManagerBase.h" |
34 |
|
35 |
#include "../../common/global_private.h" |
36 |
|
37 |
#include "../../common/Thread.h" |
38 |
#include "../../common/RingBuffer.h" |
39 |
#include "../../common/atomic.h" |
40 |
|
41 |
namespace LinuxSampler { |
42 |
|
43 |
int CompareStreamWriteSpace(const void* A, const void* B); |
44 |
|
45 |
/** @brief Disk Reader Thread |
46 |
* |
47 |
* The disk reader thread is responsible for periodically refilling |
48 |
* disk streams in parallel to the audio thread's rendering process. |
49 |
* |
50 |
* There is also a function for releasing parts of instruments not |
51 |
* in use anymore (as this is not real time safe, the audio thread |
52 |
* cannot do it directly). |
53 |
*/ |
54 |
template <class R /* Resource */, class IM /* Instrument Manager */> |
55 |
class DiskThreadBase : public Thread { |
56 |
private: |
57 |
// Private Types |
58 |
struct create_command_t { |
59 |
Stream::OrderID_t OrderID; |
60 |
Stream::Handle hStream; |
61 |
Stream::reference_t* pStreamRef; |
62 |
R* pRegion; |
63 |
unsigned long SampleOffset; |
64 |
bool DoLoop; |
65 |
}; |
66 |
struct delete_command_t { |
67 |
Stream* pStream; |
68 |
Stream::Handle hStream; |
69 |
Stream::OrderID_t OrderID; |
70 |
bool bNotify; |
71 |
}; |
72 |
struct program_change_command_t { |
73 |
uint32_t Program; |
74 |
EngineChannel* pEngineChannel; |
75 |
}; |
76 |
// Attributes |
77 |
bool IsIdle; |
78 |
uint Streams; |
79 |
RingBuffer<create_command_t,false>* CreationQueue; ///< Contains commands to create streams |
80 |
RingBuffer<delete_command_t,false>* DeletionQueue; ///< Contains commands to delete streams |
81 |
RingBuffer<delete_command_t,false>* GhostQueue; ///< Contains handles to streams that are not used anymore and weren't deletable immediately |
82 |
RingBuffer<Stream::Handle,false> DeletionNotificationQueue; ///< In case the original sender requested a notification for its stream deletion order, this queue will receive the handle of the respective stream once actually be deleted by the disk thread. |
83 |
RingBuffer<R*,false>* DeleteRegionQueue; ///< Contains dimension regions that are not used anymore and should be handed back to the instrument resource manager |
84 |
RingBuffer<program_change_command_t,false> ProgramChangeQueue; ///< Contains requests for MIDI program change |
85 |
unsigned int RefillStreamsPerRun; ///< How many streams should be refilled in each loop run |
86 |
Stream** pStreams; ///< Contains all disk streams (whether used or unused) |
87 |
Stream** pCreatedStreams; ///< This is where the voice (audio thread) picks up it's meanwhile hopefully created disk stream. |
88 |
static Stream* SLOT_RESERVED; ///< This value is used to mark an entry in pCreatedStreams[] as reserved. |
89 |
|
90 |
// Methods |
91 |
|
92 |
void CreateStream(create_command_t& Command) { |
93 |
// search for unused stream |
94 |
Stream* newstream = NULL; |
95 |
for (int i = Streams - 1; i >= 0; i--) { |
96 |
if (pStreams[i]->GetState() == Stream::state_unused) { |
97 |
newstream = pStreams[i]; |
98 |
break; |
99 |
} |
100 |
} |
101 |
if (!newstream) { |
102 |
std::cerr << "No unused stream found (OrderID:" << Command.OrderID; |
103 |
std::cerr << ") - report if this happens, this is a bug!\n" << std::flush; |
104 |
return; |
105 |
} |
106 |
LaunchStream(newstream, Command.hStream, Command.pStreamRef, Command.pRegion, Command.SampleOffset, Command.DoLoop); |
107 |
dmsg(4,("new Stream launched by disk thread (OrderID:%d,StreamHandle:%d)\n", Command.OrderID, Command.hStream)); |
108 |
if (pCreatedStreams[Command.OrderID] != SLOT_RESERVED) { |
109 |
std::cerr << "DiskThread: Slot " << Command.OrderID << " already occupied! Please report this!\n" << std::flush; |
110 |
newstream->Kill(); |
111 |
return; |
112 |
} |
113 |
pCreatedStreams[Command.OrderID] = newstream; |
114 |
} |
115 |
|
116 |
void DeleteStream(delete_command_t& Command) { |
117 |
if (Command.pStream) { |
118 |
Command.pStream->Kill(); |
119 |
if (Command.bNotify) DeletionNotificationQueue.push(&Command.hStream); |
120 |
} |
121 |
else { // the stream wasn't created by disk thread or picked up by audio thread yet |
122 |
|
123 |
// if stream was created but not picked up yet |
124 |
Stream* pStream = pCreatedStreams[Command.OrderID]; |
125 |
if (pStream && pStream != SLOT_RESERVED) { |
126 |
pStream->Kill(); |
127 |
pCreatedStreams[Command.OrderID] = NULL; // free slot for new order |
128 |
// if original sender requested a notification, let him know now |
129 |
if (Command.bNotify) |
130 |
DeletionNotificationQueue.push(&Command.hStream); |
131 |
return; |
132 |
} |
133 |
|
134 |
// the stream was not created yet |
135 |
if (GhostQueue->write_space() > 0) { |
136 |
GhostQueue->push(&Command); |
137 |
} else { // error, queue full |
138 |
if (Command.bNotify) { |
139 |
dmsg(1,("DiskThread: GhostQueue full! (might lead to dead lock with instrument editor!)\n")); |
140 |
} else { |
141 |
dmsg(1,("DiskThread: GhostQueue full!\n")); |
142 |
} |
143 |
} |
144 |
} |
145 |
} |
146 |
|
147 |
void RefillStreams() { |
148 |
// sort the streams by most empty stream |
149 |
qsort(pStreams, Streams, sizeof(Stream*), CompareStreamWriteSpace); |
150 |
|
151 |
// refill the most empty streams |
152 |
for (uint i = 0; i < RefillStreamsPerRun; i++) { |
153 |
if (pStreams[i]->GetState() == Stream::state_active) { |
154 |
|
155 |
//float filledpercentage = (float) pStreams[i]->GetReadSpace() / 131072.0 * 100.0; |
156 |
//dmsg(("\nbuffer fill: %.1f%\n", filledpercentage)); |
157 |
|
158 |
int writespace = pStreams[i]->GetWriteSpaceToEnd(); |
159 |
if (writespace == 0) break; |
160 |
|
161 |
int capped_writespace = writespace; |
162 |
// if there is too much buffer space available then cut the read/write |
163 |
// size to CONFIG_STREAM_MAX_REFILL_SIZE which is by default 65536 samples = 256KBytes |
164 |
if (writespace > CONFIG_STREAM_MAX_REFILL_SIZE) capped_writespace = CONFIG_STREAM_MAX_REFILL_SIZE; |
165 |
|
166 |
// adjust the amount to read in order to ensure that the buffer wraps correctly |
167 |
int read_amount = pStreams[i]->AdjustWriteSpaceToAvoidBoundary(writespace, capped_writespace); |
168 |
// if we wasn't able to refill one of the stream buffers by more than |
169 |
// CONFIG_STREAM_MIN_REFILL_SIZE we'll send the disk thread to sleep later |
170 |
if (pStreams[i]->ReadAhead(read_amount) > CONFIG_STREAM_MIN_REFILL_SIZE) this->IsIdle = false; |
171 |
} |
172 |
} |
173 |
} |
174 |
|
175 |
Stream::Handle CreateHandle() { |
176 |
static uint32_t counter = 0; |
177 |
if (counter == 0xffffffff) counter = 1; // we use '0' as 'invalid handle' only, so we skip 0 |
178 |
else counter++; |
179 |
return counter; |
180 |
} |
181 |
|
182 |
Stream::OrderID_t CreateOrderID() { |
183 |
static Stream::OrderID_t counter(0); |
184 |
for (int i = 0; i < Streams; i++) { |
185 |
if (counter == Streams) counter = 1; // we use '0' as 'invalid order' only, so we skip 0 |
186 |
else counter++; |
187 |
if (!pCreatedStreams[counter]) { |
188 |
pCreatedStreams[counter] = SLOT_RESERVED; // mark this slot as reserved |
189 |
return counter; // found empty slot |
190 |
} |
191 |
} |
192 |
return 0; // no free slot |
193 |
} |
194 |
|
195 |
atomic_t ActiveStreamCount; |
196 |
public: |
197 |
// Methods |
198 |
DiskThreadBase(int MaxStreams, uint BufferWrapElements, IM* pInstruments) : |
199 |
Thread(true, false, 1, -2), |
200 |
DeletionNotificationQueue(4*MaxStreams), |
201 |
ProgramChangeQueue(512), |
202 |
pInstruments(pInstruments) |
203 |
{ |
204 |
CreationQueue = new RingBuffer<create_command_t,false>(4*MaxStreams); |
205 |
DeletionQueue = new RingBuffer<delete_command_t,false>(4*MaxStreams); |
206 |
GhostQueue = new RingBuffer<delete_command_t,false>(MaxStreams); |
207 |
DeleteRegionQueue = new RingBuffer<R*,false>(4*MaxStreams); |
208 |
pStreams = new Stream*[MaxStreams]; |
209 |
pCreatedStreams = new Stream*[MaxStreams + 1]; |
210 |
Streams = MaxStreams; |
211 |
RefillStreamsPerRun = CONFIG_REFILL_STREAMS_PER_RUN; |
212 |
|
213 |
for (int i = 1; i <= MaxStreams; i++) { |
214 |
pCreatedStreams[i] = NULL; |
215 |
} |
216 |
ActiveStreamCountMax = 0; |
217 |
} |
218 |
|
219 |
virtual ~DiskThreadBase() { |
220 |
for (int i = 0; i < Streams; i++) { |
221 |
if (pStreams[i]) delete pStreams[i]; |
222 |
} |
223 |
if (CreationQueue) delete CreationQueue; |
224 |
if (DeletionQueue) delete DeletionQueue; |
225 |
if (GhostQueue) delete GhostQueue; |
226 |
if (DeleteRegionQueue) delete DeleteRegionQueue; |
227 |
if (pStreams) delete[] pStreams; |
228 |
if (pCreatedStreams) delete[] pCreatedStreams; |
229 |
} |
230 |
|
231 |
|
232 |
// ######################################################################### |
233 |
// # Foreign Thread Section |
234 |
// # (following code intended to be interface for audio thread) |
235 |
|
236 |
/** |
237 |
* Suspend disk thread, kill all active streams, clear all queues and the |
238 |
* pickup array and reset all streams. Call this method to bring everything |
239 |
* in the disk thread to day one. If the disk thread was running, it will be |
240 |
* respawned right after everything was reset. |
241 |
*/ |
242 |
void Reset() { |
243 |
bool running = this->IsRunning(); |
244 |
if (running) this->StopThread(); |
245 |
for (int i = 0; i < Streams; i++) { |
246 |
pStreams[i]->Kill(); |
247 |
} |
248 |
for (int i = 1; i <= Streams; i++) { |
249 |
pCreatedStreams[i] = NULL; |
250 |
} |
251 |
GhostQueue->init(); |
252 |
CreationQueue->init(); |
253 |
DeletionQueue->init(); |
254 |
DeletionNotificationQueue.init(); |
255 |
|
256 |
// make sure that all DimensionRegions are released |
257 |
while (DeleteRegionQueue->read_space() > 0) { |
258 |
R* pRgn; |
259 |
DeleteRegionQueue->pop(&pRgn); |
260 |
pInstruments->HandBackRegion(pRgn); |
261 |
} |
262 |
DeleteRegionQueue->init(); |
263 |
SetActiveStreamCount(0); |
264 |
ActiveStreamCountMax = 0; |
265 |
if (running) this->StartThread(); // start thread only if it was running before |
266 |
} |
267 |
|
268 |
String GetBufferFillBytes() { |
269 |
bool activestreams = false; |
270 |
std::stringstream ss; |
271 |
for (uint i = 0; i < this->Streams; i++) { |
272 |
if (pStreams[i]->GetState() == Stream::state_unused) continue; |
273 |
uint bufferfill = pStreams[i]->GetReadSpace() * sizeof(sample_t); |
274 |
uint streamid = (uint) pStreams[i]->GetHandle(); |
275 |
if (!streamid) continue; |
276 |
|
277 |
if (activestreams) ss << ",[" << streamid << ']' << bufferfill; |
278 |
else { |
279 |
ss << '[' << streamid << ']' << bufferfill; |
280 |
activestreams = true; |
281 |
} |
282 |
} |
283 |
return ss.str(); |
284 |
} |
285 |
|
286 |
String GetBufferFillPercentage() { |
287 |
bool activestreams = false; |
288 |
std::stringstream ss; |
289 |
for (uint i = 0; i < this->Streams; i++) { |
290 |
if (pStreams[i]->GetState() == Stream::state_unused) continue; |
291 |
uint bufferfill = (uint) ((float) pStreams[i]->GetReadSpace() / (float) CONFIG_STREAM_BUFFER_SIZE * 100); |
292 |
uint streamid = (uint) pStreams[i]->GetHandle(); |
293 |
if (!streamid) continue; |
294 |
|
295 |
if (activestreams) ss << ",[" << streamid << ']' << bufferfill << '%'; |
296 |
else { |
297 |
ss << '[' << streamid << ']' << bufferfill; |
298 |
activestreams = true; |
299 |
} |
300 |
} |
301 |
return ss.str(); |
302 |
} |
303 |
|
304 |
/** |
305 |
* Returns -1 if command queue or pickup pool is full, 0 on success (will be |
306 |
* called by audio thread within the voice class). |
307 |
*/ |
308 |
int OrderNewStream(Stream::reference_t* pStreamRef, R* pRegion, unsigned long SampleOffset, bool DoLoop) { |
309 |
dmsg(4,("Disk Thread: new stream ordered\n")); |
310 |
if (CreationQueue->write_space() < 1) { |
311 |
dmsg(1,("DiskThread: Order queue full!\n")); |
312 |
return -1; |
313 |
} |
314 |
|
315 |
const Stream::OrderID_t newOrder = CreateOrderID(); |
316 |
if (!newOrder) { |
317 |
dmsg(1,("DiskThread: there was no free slot\n")); |
318 |
return -1; // there was no free slot |
319 |
} |
320 |
|
321 |
pStreamRef->State = Stream::state_active; |
322 |
pStreamRef->OrderID = newOrder; |
323 |
pStreamRef->hStream = CreateHandle(); |
324 |
pStreamRef->pStream = NULL; // a stream has to be activated by the disk thread first |
325 |
|
326 |
create_command_t cmd; |
327 |
cmd.OrderID = pStreamRef->OrderID; |
328 |
cmd.hStream = pStreamRef->hStream; |
329 |
cmd.pStreamRef = pStreamRef; |
330 |
cmd.pRegion = pRegion; |
331 |
cmd.SampleOffset = SampleOffset; |
332 |
cmd.DoLoop = DoLoop; |
333 |
|
334 |
CreationQueue->push(&cmd); |
335 |
return 0; |
336 |
} |
337 |
|
338 |
/** |
339 |
* Request the disk thread to delete the given disk stream. This method |
340 |
* will return immediately, thus it won't block until the respective voice |
341 |
* was actually deleted. (Called by audio thread within the Voice class). |
342 |
* |
343 |
* @param pStreamRef - stream that shall be deleted |
344 |
* @param bRequestNotification - set to true in case you want to receive a |
345 |
* notification once the stream has actually |
346 |
* been deleted |
347 |
* @returns 0 on success, -1 if command queue is full |
348 |
* @see AskForDeletedStream() |
349 |
*/ |
350 |
int OrderDeletionOfStream(Stream::reference_t* pStreamRef, bool bRequestNotification = false) { |
351 |
dmsg(4,("Disk Thread: stream deletion ordered\n")); |
352 |
if (DeletionQueue->write_space() < 1) { |
353 |
dmsg(1,("DiskThread: Deletion queue full!\n")); |
354 |
return -1; |
355 |
} |
356 |
|
357 |
delete_command_t cmd; |
358 |
cmd.pStream = pStreamRef->pStream; |
359 |
cmd.hStream = pStreamRef->hStream; |
360 |
cmd.OrderID = pStreamRef->OrderID; |
361 |
cmd.bNotify = bRequestNotification; |
362 |
|
363 |
DeletionQueue->push(&cmd); |
364 |
return 0; |
365 |
} |
366 |
|
367 |
/** |
368 |
* Tell the disk thread to release a dimension region that belongs |
369 |
* to an instrument which isn't loaded anymore. The disk thread |
370 |
* will hand back the dimension region to the instrument resource |
371 |
* manager. (OrderDeletionOfDimreg is called from the audio thread |
372 |
* when a voice dies.) |
373 |
*/ |
374 |
int OrderDeletionOfRegion(R* pReg) { |
375 |
dmsg(4,("Disk Thread: dimreg deletion ordered\n")); |
376 |
if (DeleteRegionQueue->write_space() < 1) { |
377 |
dmsg(1,("DiskThread: DeleteRegion queue full!\n")); |
378 |
return -1; |
379 |
} |
380 |
DeleteRegionQueue->push(&pReg); |
381 |
return 0; |
382 |
} |
383 |
|
384 |
/** |
385 |
* Tell the disk thread to do a program change on the specified |
386 |
* EngineChannel. |
387 |
*/ |
388 |
int OrderProgramChange(uint32_t Program, EngineChannel* pEngineChannel) { |
389 |
program_change_command_t cmd; |
390 |
cmd.Program = Program; |
391 |
cmd.pEngineChannel = pEngineChannel; |
392 |
|
393 |
dmsg(4,("Disk Thread: program change ordered\n")); |
394 |
if (ProgramChangeQueue.write_space() < 1) { |
395 |
dmsg(1,("DiskThread: ProgramChange queue full!\n")); |
396 |
return -1; |
397 |
} |
398 |
ProgramChangeQueue.push(&cmd); |
399 |
return 0; |
400 |
} |
401 |
|
402 |
/** |
403 |
* Returns the pointer to a disk stream if the ordered disk stream |
404 |
* represented by the \a StreamOrderID was already activated by the disk |
405 |
* thread, returns NULL otherwise. If the call was successful, thus if it |
406 |
* returned a valid stream pointer, the caller has to the store that pointer |
407 |
* by himself, because it's not possible to call this method again with the |
408 |
* same used order ID; this method is just intended for picking up an ordered |
409 |
* disk stream. This method will usually be called by the voice class (within |
410 |
* the audio thread). |
411 |
* |
412 |
* @param StreamOrderID - ID previously returned by OrderNewStream() |
413 |
* @returns pointer to created stream object, NULL otherwise |
414 |
*/ |
415 |
Stream* AskForCreatedStream(Stream::OrderID_t StreamOrderID) { |
416 |
dmsg(4,("Disk Thread: been asked if stream already created, OrderID=%x ", StreamOrderID)); |
417 |
Stream* pStream = pCreatedStreams[StreamOrderID]; |
418 |
if (pStream && pStream != SLOT_RESERVED) { |
419 |
dmsg(4,("(yes created)\n")); |
420 |
pCreatedStreams[StreamOrderID] = NULL; // free the slot for a new order |
421 |
return pStream; |
422 |
} |
423 |
dmsg(4,("(no not yet created)\n")); |
424 |
return NULL; |
425 |
} |
426 |
|
427 |
/** |
428 |
* In case the original sender requested a notification with his stream |
429 |
* deletion order, he can use this method to poll if the respective stream |
430 |
* has actually been deleted. |
431 |
* |
432 |
* @returns handle / identifier of the deleted stream, or |
433 |
* Stream::INVALID_HANDLE if no notification present |
434 |
*/ |
435 |
Stream::Handle AskForDeletedStream() { |
436 |
if (DeletionNotificationQueue.read_space()) { |
437 |
Stream::Handle hStream; |
438 |
DeletionNotificationQueue.pop(&hStream); |
439 |
return hStream; |
440 |
} else return Stream::INVALID_HANDLE; // no notification received yet |
441 |
} |
442 |
|
443 |
// the number of streams currently in usage |
444 |
// printed on the console the main thread (along with the active voice count) |
445 |
uint GetActiveStreamCount() { return atomic_read(&ActiveStreamCount); } |
446 |
void SetActiveStreamCount(uint Streams) { atomic_set(&ActiveStreamCount, Streams); } |
447 |
int ActiveStreamCountMax; |
448 |
|
449 |
protected: |
450 |
IM* pInstruments; ///< The instrument resource manager of the engine that is using this disk thread. Used by the dimension region deletion feature. |
451 |
|
452 |
// ######################################################################### |
453 |
// # Disk Thread Only Section |
454 |
// # (following code should only be executed by the disk thread) |
455 |
|
456 |
// Implementation of virtual method from class Thread |
457 |
int Main() { |
458 |
dmsg(3,("Disk thread running\n")); |
459 |
|
460 |
#if DEBUG |
461 |
Thread::setNameOfCaller("DiskIO"); |
462 |
#endif |
463 |
|
464 |
while (true) { |
465 |
|
466 |
TestCancel(); |
467 |
|
468 |
IsIdle = true; // will be set to false if a stream got filled |
469 |
|
470 |
// prevent disk thread from being cancelled |
471 |
// (e.g. to prevent deadlocks while holding mutex lock(s)) |
472 |
pushCancelable(false); |
473 |
|
474 |
// if there are ghost streams, delete them |
475 |
for (int i = 0; i < GhostQueue->read_space(); i++) { //FIXME: unefficient |
476 |
delete_command_t ghostStream; |
477 |
GhostQueue->pop(&ghostStream); |
478 |
bool found = false; |
479 |
for (int i = 0; i < this->Streams; i++) { |
480 |
if (pStreams[i]->GetHandle() == ghostStream.hStream) { |
481 |
pStreams[i]->Kill(); |
482 |
found = true; |
483 |
// if original sender requested a notification, let him know now |
484 |
if (ghostStream.bNotify) |
485 |
DeletionNotificationQueue.push(&ghostStream.hStream); |
486 |
break; |
487 |
} |
488 |
} |
489 |
if (!found) GhostQueue->push(&ghostStream); // put ghost stream handle back to the queue |
490 |
} |
491 |
|
492 |
// if there are creation commands, create new streams |
493 |
while (Stream::UnusedStreams > 0 && CreationQueue->read_space() > 0) { |
494 |
create_command_t command; |
495 |
CreationQueue->pop(&command); |
496 |
CreateStream(command); |
497 |
} |
498 |
|
499 |
// if there are deletion commands, delete those streams |
500 |
while (Stream::UnusedStreams < Stream::TotalStreams && DeletionQueue->read_space() > 0) { |
501 |
delete_command_t command; |
502 |
DeletionQueue->pop(&command); |
503 |
DeleteStream(command); |
504 |
} |
505 |
|
506 |
// release DimensionRegions that belong to instruments |
507 |
// that are no longer loaded |
508 |
while (DeleteRegionQueue->read_space() > 0) { |
509 |
R* pRgn; |
510 |
DeleteRegionQueue->pop(&pRgn); |
511 |
pInstruments->HandBackRegion(pRgn); |
512 |
} |
513 |
|
514 |
// perform MIDI program change commands |
515 |
if (ProgramChangeQueue.read_space() > 0) { |
516 |
program_change_command_t cmd; |
517 |
std::map<EngineChannel*,uint32_t> cmds; |
518 |
// skip all old ones, only process the latest program |
519 |
// change command on each engine channel |
520 |
do { |
521 |
ProgramChangeQueue.pop(&cmd); |
522 |
cmds[cmd.pEngineChannel] = cmd.Program; |
523 |
} while (ProgramChangeQueue.read_space() > 0); |
524 |
// now execute those latest program change commands on |
525 |
// their respective engine channel |
526 |
for (std::map<EngineChannel*,uint32_t>::const_iterator it = cmds.begin(); |
527 |
it != cmds.end(); ++it) |
528 |
{ |
529 |
it->first->ExecuteProgramChange(it->second); |
530 |
} |
531 |
} |
532 |
|
533 |
RefillStreams(); // refill the most empty streams |
534 |
|
535 |
int streamsInUsage = 0; |
536 |
for (int i = Streams - 1; i >= 0; i--) { |
537 |
if (pStreams[i]->GetState() != Stream::state_unused) streamsInUsage++; |
538 |
} |
539 |
SetActiveStreamCount(streamsInUsage); |
540 |
if (streamsInUsage > ActiveStreamCountMax) ActiveStreamCountMax = streamsInUsage; |
541 |
|
542 |
// now allow disk thread being cancelled again |
543 |
// (since all mutexes are now unlocked and data structures |
544 |
// are at consistent states) |
545 |
popCancelable(); |
546 |
|
547 |
// if nothing was done during this iteration (i.e. no |
548 |
// stream buffer filled with data) then sleep for 30ms |
549 |
if (IsIdle) |
550 |
usleep(30000); //NOTE: defined as cancellation point by POSIX |
551 |
} |
552 |
|
553 |
return EXIT_FAILURE; |
554 |
} |
555 |
|
556 |
virtual Stream* CreateStream(long BufferSize, uint BufferWrapElements) = 0; |
557 |
|
558 |
void CreateAllStreams(int MaxStreams, uint BufferWrapElements) { |
559 |
for (int i = 0; i < MaxStreams; i++) { |
560 |
pStreams[i] = CreateStream(CONFIG_STREAM_BUFFER_SIZE, BufferWrapElements); |
561 |
} |
562 |
} |
563 |
|
564 |
virtual void LaunchStream ( |
565 |
Stream* pStream, |
566 |
Stream::Handle hStream, |
567 |
Stream::reference_t* pExportReference, |
568 |
R* pRgn, |
569 |
unsigned long SampleOffset, |
570 |
bool DoLoop |
571 |
) = 0; |
572 |
|
573 |
friend class Stream; |
574 |
}; |
575 |
} // namespace LinuxSampler |
576 |
|
577 |
#endif // __LS_DISKTHREADBASE_H__ |