/[svn]/linuxsampler/tags/start/voice.cpp
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Contents of /linuxsampler/tags/start/voice.cpp

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Revision 6 - (show annotations) (download)
Sat Oct 25 20:24:32 2003 UTC (20 years, 5 months ago) by (unknown author)
File size: 9517 byte(s)
This commit was manufactured by cvs2svn to create tag 'start'.
1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003 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 #include "voice.h"
24
25 // FIXME: no support for layers (nor crossfades) yet
26
27 DiskThread* Voice::pDiskThread = NULL;
28
29 Voice::Voice(DiskThread* pDiskThread) {
30 Active = false;
31 Voice::pDiskThread = pDiskThread;
32 }
33
34 Voice::~Voice() {
35 }
36
37 void Voice::Trigger(int MIDIKey, uint8_t Velocity, gig::Instrument* Instrument) {
38 Active = true;
39 pRegion = Instrument->GetRegion(MIDIKey);
40 PlaybackState = playback_state_ram; // we always start playback from RAM cache and switch then to disk if needed
41 Pos = 0;
42
43 if (!pRegion) {
44 std::cerr << "Audio Thread: No Region defined for MIDI key " << MIDIKey << std::endl << std::flush;
45 Active = false;
46 return;
47 }
48
49 //TODO: current MIDI controller values are not taken into account yet
50 gig::DimensionRegion* pDimRgn = NULL;
51 for (int i = pRegion->Dimensions - 1; i >= 0; i--) { // Check if instrument has a velocity split
52 if (pRegion->pDimensionDefinitions[i].dimension == gig::dimension_velocity) {
53 uint DimValues[5] = {0,0,0,0,0};
54 DimValues[i] = Velocity;
55 pDimRgn = pRegion->GetDimensionRegionByValue(DimValues[4],DimValues[3],DimValues[2],DimValues[1],DimValues[0]);
56 break;
57 }
58 }
59 if (!pDimRgn) { // if there was no velocity split
60 pDimRgn = pRegion->GetDimensionRegionByValue(0,0,0,0,0);
61 }
62
63 pSample = pDimRgn->pSample; // sample won't change until the voice is finished
64
65 // Check if the sample needs disk streaming or is too short for that
66 long cachedsamples = pSample->GetCache().Size / pSample->FrameSize;
67 DiskVoice = cachedsamples < pSample->SamplesTotal;
68
69 if (DiskVoice) {
70 MaxRAMPos = cachedsamples - (OutputBufferSize << MAX_PITCH) / pSample->Channels;
71 pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos);
72 dmsg(("Disk voice launched (cached samples: %d, total Samples: %d, MaxRAMPos: %d\n", cachedsamples, pSample->SamplesTotal, MaxRAMPos));
73 }
74 else {
75 MaxRAMPos = cachedsamples;
76 dmsg(("RAM only voice launched\n"));
77 }
78
79 CurrentPitch = pow(2, (double) (MIDIKey - (int) pSample->MIDIUnityNote) / (double) 12);
80
81 // ************************************************
82 // TODO: ARTICULATION DATA HANDLING IS MISSING HERE
83 // ************************************************
84 }
85
86 void Voice::RenderAudio() {
87
88 switch (this->PlaybackState) {
89
90 case playback_state_ram: {
91 Interpolate((sample_t*) pSample->GetCache().pStart);
92 if (DiskVoice) {
93 // check if we reached the allowed limit of the sample RAM cache
94 if (Pos > MaxRAMPos) {
95 dmsg(("Voice: switching to disk playback (Pos=%f)\n", Pos));
96 this->PlaybackState = playback_state_disk;
97 }
98 }
99 else if (Pos >= pSample->GetCache().Size / pSample->FrameSize) {
100 this->PlaybackState = playback_state_end;
101 }
102 }
103 break;
104
105 case playback_state_disk: {
106 if (!DiskStreamRef.pStream) {
107 // check if the disk thread created our ordered disk stream in the meantime
108 DiskStreamRef.pStream = pDiskThread->AskForCreatedStream(DiskStreamRef.OrderID);
109 if (!DiskStreamRef.pStream) {
110 std::cout << stderr << "Disk stream not available in time!" << std::endl << std::flush;
111 pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
112 this->Active = false;
113 return;
114 }
115 DiskStreamRef.pStream->IncrementReadPos(pSample->Channels * (double_to_int(Pos) - MaxRAMPos));
116 Pos -= double_to_int(Pos);
117 }
118
119 // add silence sample at the end if we reached the end of the stream (for the interpolator)
120 if (DiskStreamRef.State == Stream::state_end && DiskStreamRef.pStream->GetReadSpace() < (OutputBufferSize << MAX_PITCH) / pSample->Channels) {
121 DiskStreamRef.pStream->WriteSilence((OutputBufferSize << MAX_PITCH) / pSample->Channels);
122 this->PlaybackState = playback_state_end;
123 }
124
125 sample_t* ptr = DiskStreamRef.pStream->GetReadPtr(); // get the current read_ptr within the ringbuffer where we read the samples from
126 Interpolate(ptr);
127 DiskStreamRef.pStream->IncrementReadPos(double_to_int(Pos) * pSample->Channels);
128 Pos -= double_to_int(Pos);
129 }
130 break;
131
132 case playback_state_end:
133 this->Active = false; // free voice
134 break;
135 }
136 }
137
138 void Voice::Interpolate(sample_t* pSrc) {
139 float effective_volume = 1; // TODO: use the art. data instead
140 int i = 0;
141
142 // ************************************************
143 // TODO: ARTICULATION DATA HANDLING IS MISSING HERE
144 // ************************************************
145
146 // FIXME: assuming either mono or stereo
147 if (this->pSample->Channels == 2) { // Stereo Sample
148 while (i < this->OutputBufferSize) {
149 #ifdef USE_LINEAR_INTERPOLATION
150 int pos_int = double_to_int(this->Pos); // integer position
151 float pos_fract = this->Pos - pos_int; // fractional part of position
152 pos_int <<= 1;
153 // left channel
154 this->pOutput[i++] += effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+2] - pSrc[pos_int]));
155 // right channel
156 this->pOutput[i++] += effective_volume * (pSrc[pos_int+1] + pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1]));
157 #else // polynomial interpolation
158 //FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile
159 xm1 = pSrc[pos_int];
160 x0 = pSrc[pos_int+1];
161 x1 = pSrc[pos_int+2];
162 x2 = pSrc[pos_int+3];
163 a = (3 * (x0-x1) - xm1 + x2) / 2;
164 b = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
165 c = (x1 - xm1) / 2;
166 this->pOutput[u] += effective_volume*((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
167 #endif // USE_LINEAR_INTERPOLATION
168
169 this->Pos += this->CurrentPitch;
170 }
171 }
172 else { // Mono Sample
173 while (i < this->OutputBufferSize) {
174 #ifdef USE_LINEAR_INTERPOLATION
175 int pos_int = double_to_int(this->Pos); // integer position
176 float pos_fract = this->Pos - pos_int; // fractional part of position
177 float sample_point = effective_volume * (pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]));
178 this->pOutput[i] += sample_point;
179 this->pOutput[i+1] += sample_point;
180 i += 2;
181 #else // polynomial interpolation
182 //FIXME: !!!THIS WON'T WORK!!! needs to be adjusted for stereo, use linear interpolation meanwhile
183 xm1 = pSrc[pos_int];
184 x0 = pSrc[pos_int+1];
185 x1 = pSrc[pos_int+2];
186 x2 = pSrc[pos_int+3];
187 a = (3 * (x0-x1) - xm1 + x2) / 2;
188 b = 2 * x1 + xm1 - (5 * x0 + x2) / 2;
189 c = (x1 - xm1) / 2;
190 this->pOutput[u] += effective_volume*((((a * pos_fract) + b) * pos_fract + c) * pos_fract + x0);
191 #endif
192
193 this->Pos += this->CurrentPitch;
194 }
195 }
196 }
197
198 void Voice::Kill() {
199 if (DiskVoice && DiskStreamRef.State != Stream::state_unused) {
200 pDiskThread->OrderDeletionOfStream(&DiskStreamRef);
201 }
202 Active = false;
203 }

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