/[svn]/linuxsampler/trunk/src/engines/gig/DiskThread.h
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Contents of /linuxsampler/trunk/src/engines/gig/DiskThread.h

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Revision 56 - (show annotations) (download) (as text)
Tue Apr 27 09:21:58 2004 UTC (19 years, 11 months ago) by schoenebeck
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updated copyright header for 2004

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 #ifndef __LS_GIG_DISKTHREAD_H__
24 #define __LS_GIG_DISKTHREAD_H__
25
26 #include "../../common/global.h"
27
28 #if DEBUG_HEADERS
29 # warning DiskThread.h included
30 #endif // DEBUG_HEADERS
31
32 #define REFILL_STREAMS_PER_RUN 4 ///< number of streams that should be refilled with each disk thread cycle
33 #define MIN_REFILL_SIZE 1024 ///< if no buffer was filled up more than this bottom limit, the disk thread will go to sleep
34 #define MAX_REFILL_SIZE 65536 ///< maximum of samples a buffer should be refilled in one cycle (256kB, as 16 bit stereo)
35 #define STREAM_BUFFER_SIZE 131072 ///< the diskstream ringbuffer size (256kB as sample_t is 16bit)
36 #define MAX_INPUT_STREAMS 100 ///< number of streams that should be allocated
37
38 #include "../../common/Thread.h"
39 #include "../../common/RingBuffer.h"
40 #include "Stream.h"
41 #include "Voice.h"
42
43 namespace LinuxSampler { namespace gig {
44
45 int CompareStreamWriteSpace(const void* a, const void* b);
46
47 class DiskThread : public Thread {
48 public:
49 // Methods
50 DiskThread(uint BufferWrapElements);
51 ~DiskThread();
52 void Reset();
53 String GetBufferFillBytes();
54 String GetBufferFillPercentage();
55 int OrderNewStream(Stream::reference_t* pStreamRef, ::gig::Sample* pSample, unsigned long SampleOffset, bool DoLoop);
56 int OrderDeletionOfStream(Stream::reference_t* pStreamRef);
57 Stream* AskForCreatedStream(Stream::OrderID_t StreamOrderID);
58
59 // the number of streams currently in usage
60 // printed on the console the main thread (along with the active voice count)
61 int ActiveStreamCount;
62 int ActiveStreamCountMax;
63
64 protected:
65 int Main(); ///< Implementation of virtual method from class Thread
66 private:
67 // Private Types
68 struct create_command_t {
69 Stream::OrderID_t OrderID;
70 Stream::Handle hStream;
71 Stream::reference_t* pStreamRef;
72 ::gig::Sample* pSample;
73 unsigned long SampleOffset;
74 bool DoLoop;
75 };
76 struct delete_command_t {
77 Stream* pStream;
78 Stream::Handle hStream;
79 Stream::OrderID_t OrderID;
80 };
81
82 // Attributes
83 bool IsIdle;
84 uint Streams;
85 RingBuffer<create_command_t>* CreationQueue; ///< Contains commands to create streams
86 RingBuffer<delete_command_t>* DeletionQueue; ///< Contains commands to delete streams
87 RingBuffer<Stream::Handle>* GhostQueue; ///< Contains handles to streams that are not used anymore and weren't deletable immediately
88 unsigned int RefillStreamsPerRun; ///< How many streams should be refilled in each loop run
89 Stream* pStreams[MAX_INPUT_STREAMS]; ///< Contains all disk streams (wether used or unused)
90 Stream* pCreatedStreams[MAX_INPUT_STREAMS + 1]; ///< This is where the voice (audio thread) picks up it's meanwhile hopefully created disk stream.
91 static Stream* SLOT_RESERVED; ///< This value is used to mark an entry in pCreatedStreams[] as reserved.
92
93 // Methods
94 void CreateStream(create_command_t& Command);
95 void DeleteStream(delete_command_t& Command);
96 void RefillStreams();
97 Stream::Handle CreateHandle();
98 Stream::OrderID_t CreateOrderID();
99 };
100
101 }} // namespace LinuxSampler::gig
102
103 #endif // __LS_GIG_DISKTHREAD_H__

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