/[svn]/linuxsampler/trunk/src/engines/sf2/Stream.cpp
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Contents of /linuxsampler/trunk/src/engines/sf2/Stream.cpp

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Revision 2012 - (show annotations) (download)
Fri Oct 23 17:53:17 2009 UTC (9 years, 7 months ago) by iliev
File size: 4907 byte(s)
* Refactoring: moved the independent code from
  the Gigasampler format engine to base classes
* SFZ format engine: experimental code (not usable yet)
* SoundFont format engine: experimental code (not usable yet)
* Fixed crash which may occur when MIDI key + transpose is out of range

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005-2009 Christian Schoenebeck *
7 * Copyright (C) 2009 Grigor Iliev *
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 * This program is distributed in the hope that it will be useful, *
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17 * GNU General Public License for more details. *
18 * *
19 * You should have received a copy of the GNU General Public License *
20 * along with this program; if not, write to the Free Software *
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
22 * MA 02111-1307 USA *
23 ***************************************************************************/
24
25 #include <signal.h>
26
27
28 #include "Stream.h"
29 #include "../../common/global_private.h"
30
31 namespace LinuxSampler { namespace sf2 {
32
33 Stream::Stream (
34 uint BufferSize,
35 uint BufferWrapElements
36 ) : LinuxSampler::StreamBase< ::sf2::Region>(BufferSize, BufferWrapElements) {
37
38 }
39
40 long Stream::Read(uint8_t* pBuf, long SamplesToRead) {
41 ::sf2::Sample* pSample = pRegion->pSample;
42 long total_readsamples = 0, readsamples = 0;
43 bool endofsamplereached;
44
45 // refill the disk stream buffer
46 if (this->DoLoop) { // honor looping
47 ::sf2::Sample::PlaybackState pbs;
48 pbs.position = PlaybackState.position;
49 pbs.reverse = PlaybackState.reverse;
50 pbs.loop_cycles_left = PlaybackState.loop_cycles_left;
51
52 total_readsamples = pSample->ReadAndLoop(pBuf, SamplesToRead, &pbs);
53 endofsamplereached = (this->PlaybackState.position >= pSample->GetTotalFrameCount());
54 dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->PlaybackState.position));
55 }
56 else { // normal forward playback
57
58 pSample->SetPos(this->SampleOffset); // recover old position
59
60 do {
61 readsamples = pSample->Read(&pBuf[total_readsamples * pSample->GetFrameSize()], SamplesToRead);
62 SamplesToRead -= readsamples;
63 total_readsamples += readsamples;
64 } while (SamplesToRead && readsamples > 0);
65
66 // we have to store the position within the sample, because other streams might use the same sample
67 this->SampleOffset = pSample->GetPos();
68
69 endofsamplereached = (SampleOffset >= pSample->GetTotalFrameCount());
70 dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->SampleOffset));
71 }
72
73 // update stream state
74 if (endofsamplereached) SetState(state_end);
75 else SetState(state_active);
76
77 return total_readsamples;
78 }
79
80 void Stream::Kill() {
81 StreamBase< ::sf2::Region>::Kill();
82 }
83
84 void Stream::Launch (
85 Stream::Handle hStream,
86 reference_t* pExportReference,
87 ::sf2::Region* pRgn,
88 unsigned long SampleOffset,
89 bool DoLoop
90 ) {
91 SampleDescription info;
92 info.ChannelsPerFrame = pRgn->pSample->GetChannelCount();
93 info.FrameSize = pRgn->pSample->GetFrameSize();
94 info.BytesPerSample = pRgn->pSample->GetFrameSize() / pRgn->pSample->GetChannelCount();
95 info.TotalSampleCount = pRgn->pSample->GetTotalFrameCount();
96
97 Sample::PlaybackState playbackState;
98 playbackState.position = SampleOffset;
99 playbackState.reverse = false;
100 playbackState.loop_cycles_left = 0; // TODO: pRgn->pSample->LoopPlayCount;
101
102 LinuxSampler::StreamBase< ::sf2::Region>::Launch (
103 hStream, pExportReference, pRgn, info, playbackState, SampleOffset, DoLoop
104 );
105 }
106
107 }} // namespace LinuxSampler::sf2

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