/[svn]/linuxsampler/trunk/src/diskthread.cpp
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Contents of /linuxsampler/trunk/src/diskthread.cpp

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Revision 12 - (show annotations) (download)
Sun Nov 16 19:01:50 2003 UTC (20 years, 4 months ago) by schoenebeck
File size: 10288 byte(s)
* src/gig.cpp: fixed bug in decompression algorithm which caused it not to
  detect the end of a stream and let the disk streams reload forever also
  resulting in strange sounds at the end of disk voices (concerned only
  playback of compressed gig files)
* src/audiothread.cpp: deallocation of voices when they reached the end of
  playback (thus e.g. when sustain pedal is pressed and a disk stream
  reached it's end)
* various endian corrections needed for non intel systems
* introduced debug level, you can set the debug level and thus the
  verbosity of LinuxSampler in src/global.h

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003 by Benno Senoner *
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 "diskthread.h"
24
25
26 // *********** DiskThread **************
27 // *
28
29
30 // #########################################################################
31 // # Foreign Thread Section
32 // # (following code intended to be interface for audio thread)
33
34
35 /**
36 * Returns -1 if command queue is full, 0 on success (will be called by audio
37 * thread within the voice class).
38 */
39 int DiskThread::OrderNewStream(Stream::reference_t* pStreamRef, gig::Sample* pSample, unsigned long SampleOffset) {
40 dmsg(4,("Disk Thread: new stream ordered\n"));
41 if (CreationQueue->write_space() < 1) return -1;
42
43 pStreamRef->State = Stream::state_active;
44 pStreamRef->OrderID = CreateOrderID();
45 pStreamRef->hStream = CreateHandle();
46 pStreamRef->pStream = NULL; // a stream has to be activated by the disk thread first
47
48 create_command_t cmd;
49 cmd.pStreamRef = pStreamRef;
50 cmd.pSample = pSample;
51 cmd.SampleOffset = SampleOffset;
52
53 CreationQueue->write(&cmd, 1);
54 return 0;
55 }
56
57 /**
58 * Returns -1 if command queue is full, 0 on success (will be called by audio
59 * thread within the voice class).
60 */
61 int DiskThread::OrderDeletionOfStream(Stream::reference_t* pStreamRef) {
62 dmsg(4,("Disk Thread: stream deletion ordered\n"));
63 if (DeletionQueue->write_space() < 1) return -1;
64
65 delete_command_t cmd;
66 cmd.pStream = pStreamRef->pStream;
67 cmd.hStream = pStreamRef->hStream;
68 cmd.OrderID = pStreamRef->OrderID;
69
70 DeletionQueue->write(&cmd, 1);
71 return 0;
72 }
73
74 /**
75 * Returns the pointer to a disk stream if the ordered disk stream
76 * represented by the \a StreamOrderID was already activated by the disk
77 * thread, returns NULL otherwise. If the call was successful, thus if it
78 * returned a valid stream pointer, the caller has to the store that pointer
79 * by himself, because it's not possible to call this method again with the
80 * same used order ID; this method is just intended for picking up an ordered
81 * disk stream. This method will usually be called by the voice class (within
82 * the audio thread).
83 *
84 * @param StreamOrderID - ID previously returned by OrderNewStream()
85 * @returns pointer to created stream object, NULL otherwise
86 */
87 Stream* DiskThread::AskForCreatedStream(Stream::OrderID_t StreamOrderID) {
88 dmsg(4,("Disk Thread: been asked if stream already created, OrderID=%x ", StreamOrderID));
89 Stream* pStream = pCreatedStreams[StreamOrderID];
90 if (pStream) { dmsg(4,("(yes created)")) }
91 else { dmsg(4,("(no not yet created)")) }
92 pCreatedStreams[StreamOrderID] = NULL; // free the slot for a new order
93 return pStream;
94 }
95
96
97
98 // #########################################################################
99 // # Disk Thread Only Section
100 // # (following code should only be executed by the disk thread)
101
102
103 DiskThread::DiskThread(uint BufferWrapElements) : Thread(false, 1, -2) {
104 CreationQueue = new RingBuffer<create_command_t>(1024);
105 DeletionQueue = new RingBuffer<delete_command_t>(1024);
106 Streams = MAX_INPUT_STREAMS;
107 RefillStreamsPerRun = 4;
108 for (int i = 0; i < MAX_INPUT_STREAMS; i++) {
109 pStreams[i] = new Stream(131072, BufferWrapElements); // 131072 sample words
110 }
111 for (int i = 1; i <= MAX_INPUT_STREAMS; i++) {
112 pCreatedStreams[i] = NULL;
113 }
114 }
115
116 DiskThread::~DiskThread() {
117 for (int i = 0; i < MAX_INPUT_STREAMS; i++) {
118 if (pStreams[i]) delete pStreams[i];
119 }
120 if (CreationQueue) delete CreationQueue;
121 if (DeletionQueue) delete DeletionQueue;
122 }
123
124 int DiskThread::Main() {
125 dmsg(3,("Disk thread running\n"));
126 while (true) {
127 IsIdle = true; // will be set to false if a stream got filled
128
129 // if there are creation commands, create new streams
130 while (Stream::UnusedStreams > 0 && CreationQueue->read_space() > 0) {
131 create_command_t command;
132 CreationQueue->read(&command, 1);
133 CreateStream(command);
134 }
135
136 // if there are deletion commands, delete those streams
137 while (Stream::UnusedStreams < Streams && DeletionQueue->read_space() > 0) {
138 delete_command_t command;
139 DeletionQueue->read(&command, 1);
140 DeleteStream(command);
141 }
142
143 RefillStreams(); // refill the most empty streams
144
145 // if nothing was done during this iteration (eg no streambuffer
146 // filled with data) then sleep for 50ms
147 if (IsIdle) usleep(30000);
148
149 int act_streams=0;
150 for (int i = Streams - 1; i >= 0; i--) {
151 if (pStreams[i]->GetState() == Stream::state_active) act_streams++;
152 }
153 ActiveStreamCount=act_streams;
154
155 }
156
157 return EXIT_FAILURE;
158 }
159
160 void DiskThread::CreateStream(create_command_t& Command) {
161 // search for unused stream
162 Stream* newstream = NULL;
163 for (int i = Streams - 1; i >= 0; i--) {
164 if (pStreams[i]->GetState() == Stream::state_unused) {
165 newstream = pStreams[i];
166 break;
167 }
168 }
169 if (!newstream) {
170 dmsg(1,("No unused stream found (OrderID:%x) - report if this happens, this is a bug!\n", Command.pStreamRef->OrderID));
171 return;
172 }
173 dmsg(4,("new Stream launched by disk thread (OrderID:%x,StreamHandle:%x)\n", Command.pStreamRef->OrderID, Command.pStreamRef->hStream));
174 newstream->Launch(Command.pStreamRef, Command.pSample, Command.SampleOffset);
175 pCreatedStreams[Command.pStreamRef->OrderID] = newstream;
176 }
177
178 void DiskThread::DeleteStream(delete_command_t& Command) {
179 if (Command.pStream) Command.pStream->Kill();
180 else { // the stream wasn't created by disk thread or picked up by audio thread yet
181
182 // stream was created but not picked up yet
183 Stream* pStream = pCreatedStreams[Command.OrderID];
184 if (pStream) {
185 pStream->Kill();
186 pCreatedStreams[Command.OrderID] = NULL; // free slot for new order
187 return;
188 }
189
190 // else we have to compare the handle with the one's of all streams
191 // (this case should occur only very rarely)
192 for (int i = 0; i < this->Streams; i++) {
193 if (pStreams[i]->GetHandle() == Command.hStream) {
194 pStreams[i]->Kill();
195 return;
196 }
197 }
198 }
199 }
200
201 void DiskThread::RefillStreams() {
202 // sort the streams by most empty stream
203 qsort(pStreams, Streams, sizeof(Stream*), CompareStreamWriteSpace);
204
205 // refill the most empty streams
206 for (uint i = 0; i < RefillStreamsPerRun; i++) {
207 if (pStreams[i]->GetState() == Stream::state_active) {
208
209 //float filledpercentage = (float) pStreams[i]->GetReadSpace() / 131072.0 * 100.0;
210 //dmsg(("\nbuffer fill: %.1f%\n", filledpercentage));
211
212 int writespace = pStreams[i]->GetWriteSpaceToEnd();
213 if (writespace == 0) break;
214
215 int capped_writespace = writespace;
216 // if there is too much buffer space available then cut the read/write
217 // size to MAX_REFILL_SIZE which is by default 65536 samples = 256KBytes
218 if (writespace > MAX_REFILL_SIZE) capped_writespace = MAX_REFILL_SIZE;
219
220 // adjust the amount to read in order to ensure that the buffer wraps correctly
221 int read_amount = pStreams[i]->AdjustWriteSpaceToAvoidBoundary(writespace, capped_writespace);
222 // if we wasn't able to refill one of the stream buffers by more than
223 // MIN_REFILL_SIZE we'll send the disk thread to sleep later
224 if (pStreams[i]->ReadAhead(read_amount) > MIN_REFILL_SIZE) this->IsIdle = false;
225 }
226 }
227 }
228
229 /// Handle Generator
230 Stream::Handle DiskThread::CreateHandle() {
231 static uint32_t counter = 0;
232 if (counter == 0xffffffff) counter = 1; // we use '0' as 'invalid handle' only, so we skip 0
233 else counter++;
234 return counter;
235 }
236
237 /// order ID Generator
238 Stream::OrderID_t DiskThread::CreateOrderID() {
239 static uint32_t counter = 0;
240 do {
241 if (counter == MAX_INPUT_STREAMS) counter = 1; // we use '0' as 'invalid order' only, so we skip 0
242 else counter++;
243 } while (pCreatedStreams[counter]); // until empty slot found
244 return counter;
245 }
246
247
248
249 // *********** C functions **************
250 // *
251
252 /**
253 * This is the comparison function the qsort algo uses to determine if a value is
254 * bigger than another one or special in our case; if the writespace of a stream
255 * is bigger than another one.
256 */
257 int CompareStreamWriteSpace(const void* A, const void* B) {
258 Stream* a = *(Stream**) A;
259 Stream* b = *(Stream**) B;
260 return b->GetWriteSpace() - a->GetWriteSpace();
261 }

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