1 /***************************************************************************
2 * *
3 * Copyright (C) 2008 - 2020 Christian Schoenebeck *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the Free Software *
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
18 * MA 02111-1307 USA *
19 ***************************************************************************/
20
21 #include "EffectChain.h"
22
23 #include "../common/global_private.h"
24
25 namespace LinuxSampler {
26
EffectChain(AudioOutputDevice * pDevice,int iEffectChainId)27 EffectChain::EffectChain(AudioOutputDevice* pDevice, int iEffectChainId) {
28 this->pDevice = pDevice;
29 iID = iEffectChainId;
30 }
31
AppendEffect(Effect * pEffect)32 void EffectChain::AppendEffect(Effect* pEffect) {
33 pEffect->InitEffect(pDevice);
34 _ChainEntry entry = { pEffect, true };
35 vEntries.push_back(entry);
36 pEffect->SetParent(this);
37 }
38
InsertEffect(Effect * pEffect,int iChainPos)39 void EffectChain::InsertEffect(Effect* pEffect, int iChainPos) throw (Exception) {
40 if (iChainPos == vEntries.size()) {
41 AppendEffect(pEffect);
42 return;
43 }
44 if (iChainPos < 0 || iChainPos >= vEntries.size())
45 throw Exception(
46 "Cannot insert effect at chain position " +
47 ToString(iChainPos) + ", index out of bounds."
48 );
49 pEffect->InitEffect(pDevice); // might throw Exception !
50 std::vector<_ChainEntry>::iterator iter = vEntries.begin();
51 for (int i = 0; i < iChainPos; ++i) ++iter;
52 _ChainEntry entry = { pEffect, true };
53 vEntries.insert(iter, entry);
54 pEffect->SetParent(this);
55 }
56
RemoveEffect(int iChainPos)57 void EffectChain::RemoveEffect(int iChainPos) throw (Exception) {
58 if (iChainPos < 0 || iChainPos >= vEntries.size())
59 throw Exception(
60 "Cannot remove effect at chain position " +
61 ToString(iChainPos) + ", index out of bounds."
62 );
63 std::vector<_ChainEntry>::iterator iter = vEntries.begin();
64 for (int i = 0; i < iChainPos; ++i) ++iter;
65 Effect* pEffect = (*iter).pEffect;
66 vEntries.erase(iter);
67 pEffect->SetParent(NULL); // mark effect as not in use anymore
68 }
69
RenderAudio(uint Samples)70 void EffectChain::RenderAudio(uint Samples) {
71 for (int i = 0; i < vEntries.size(); ++i) {
72 Effect* pCurrentEffect = vEntries[i].pEffect;
73 if (i) { // import signal from previous effect
74 Effect* pPrevEffect = vEntries[i - 1].pEffect;
75 for (int iChan = 0; iChan < pPrevEffect->OutputChannelCount() && iChan < pCurrentEffect->InputChannelCount(); ++iChan) {
76 pPrevEffect->OutputChannel(iChan)->MixTo(
77 pCurrentEffect->InputChannel(iChan),
78 Samples
79 );
80 }
81 }
82 if (IsEffectActive(i)) pCurrentEffect->RenderAudio(Samples);
83 else { //TODO: lazy, suboptimal implementation of inactive, bypassed effects
84 for (int iChan = 0; iChan < pCurrentEffect->OutputChannelCount() && iChan < pCurrentEffect->InputChannelCount(); ++iChan) {
85 pCurrentEffect->InputChannel(iChan)->MixTo(
86 pCurrentEffect->OutputChannel(iChan),
87 Samples
88 );
89 }
90 }
91 }
92 }
93
GetEffect(int iChainPos) const94 Effect* EffectChain::GetEffect(int iChainPos) const {
95 if (iChainPos < 0 || iChainPos >= vEntries.size()) return NULL;
96 return vEntries[iChainPos].pEffect;
97 }
98
EffectCount() const99 int EffectChain::EffectCount() const {
100 return (int) vEntries.size();
101 }
102
Reconnect(AudioOutputDevice * pDevice)103 void EffectChain::Reconnect(AudioOutputDevice* pDevice) {
104 for (int i = 0; i < vEntries.size(); ++i) {
105 Effect* pEffect = vEntries[i].pEffect;
106 pEffect->InitEffect(pDevice);
107 }
108 }
109
SetEffectActive(int iChainPos,bool bOn)110 void EffectChain::SetEffectActive(int iChainPos, bool bOn) throw (Exception) {
111 if (iChainPos < 0 || iChainPos >= vEntries.size())
112 throw Exception(
113 "Cannot change active state of effect at chain position " +
114 ToString(iChainPos) + ", index out of bounds."
115 );
116 vEntries[iChainPos].bActive = bOn;
117 }
118
IsEffectActive(int iChainPos) const119 bool EffectChain::IsEffectActive(int iChainPos) const {
120 if (iChainPos < 0 || iChainPos >= vEntries.size()) return false;
121 return vEntries[iChainPos].bActive;
122 }
123
ClearAllChannels()124 void EffectChain::ClearAllChannels() {
125 for (int iEffect = 0; iEffect < vEntries.size(); ++iEffect) {
126 Effect* pEffect = vEntries[iEffect].pEffect;
127 for (int i = 0; i < pEffect->InputChannelCount(); ++i)
128 pEffect->InputChannel(i)->Clear(); // zero out buffers
129 for (int i = 0; i < pEffect->OutputChannelCount(); ++i)
130 pEffect->OutputChannel(i)->Clear(); // zero out buffers
131 }
132 }
133
ID() const134 int EffectChain::ID() const {
135 return iID;
136 }
137
138 } // namespace LinuxSampler
139