/[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 2015 - (show annotations) (download)
Sun Oct 25 22:22:52 2009 UTC (14 years, 5 months ago) by iliev
File size: 5074 byte(s)
* Refactoring: moved the independent code from gig::Voice to base classes
* SoundFont format engine: implemented EG1 & EG2

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 PlaybackState.position = pbs.position;
54 PlaybackState.reverse = pbs.reverse;
55 PlaybackState.loop_cycles_left = pbs.loop_cycles_left;
56 endofsamplereached = (this->PlaybackState.position >= pSample->GetTotalFrameCount());
57 dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->PlaybackState.position));
58 }
59 else { // normal forward playback
60
61 pSample->SetPos(this->SampleOffset); // recover old position
62
63 do {
64 readsamples = pSample->Read(&pBuf[total_readsamples * pSample->GetFrameSize()], SamplesToRead);
65 SamplesToRead -= readsamples;
66 total_readsamples += readsamples;
67 } while (SamplesToRead && readsamples > 0);
68
69 // we have to store the position within the sample, because other streams might use the same sample
70 this->SampleOffset = pSample->GetPos();
71
72 endofsamplereached = (SampleOffset >= pSample->GetTotalFrameCount());
73 dmsg(5,("Refilled stream %d with %d (SamplePos: %d)", this->hThis, total_readsamples, this->SampleOffset));
74 }
75
76 // update stream state
77 if (endofsamplereached) SetState(state_end);
78 else SetState(state_active);
79
80 return total_readsamples;
81 }
82
83 void Stream::Kill() {
84 StreamBase< ::sf2::Region>::Kill();
85 }
86
87 void Stream::Launch (
88 Stream::Handle hStream,
89 reference_t* pExportReference,
90 ::sf2::Region* pRgn,
91 unsigned long SampleOffset,
92 bool DoLoop
93 ) {
94 SampleDescription info;
95 info.ChannelsPerFrame = pRgn->pSample->GetChannelCount();
96 info.FrameSize = pRgn->pSample->GetFrameSize();
97 info.BytesPerSample = pRgn->pSample->GetFrameSize() / pRgn->pSample->GetChannelCount();
98 info.TotalSampleCount = pRgn->pSample->GetTotalFrameCount();
99
100 Sample::PlaybackState playbackState;
101 playbackState.position = SampleOffset;
102 playbackState.reverse = false;
103 playbackState.loop_cycles_left = 0; // TODO: pRgn->pSample->LoopPlayCount;
104
105 LinuxSampler::StreamBase< ::sf2::Region>::Launch (
106 hStream, pExportReference, pRgn, info, playbackState, SampleOffset, DoLoop
107 );
108 }
109
110 }} // namespace LinuxSampler::sf2

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