| 1 | /* |
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| 2 | mediastreamer2 library - modular sound and video processing and streaming |
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| 3 | Copyright (C) 2006 Simon MORLAT (simon.morlat@linphone.org) |
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| 4 | |
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| 5 | This program is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU General Public License |
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| 7 | as published by the Free Software Foundation; either version 2 |
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| 8 | of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | This program is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | GNU General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU General Public License |
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| 16 | along with this program; if not, write to the Free Software |
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| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 18 | */ |
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| 19 | |
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| 20 | #include "mediastreamer2/msvolume.h" |
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| 21 | #include <math.h> |
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| 22 | |
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| 23 | static const float max_e=32767*32767; |
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| 24 | static const float coef=0.1; |
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| 25 | static const float gain_k=0.02; |
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| 26 | static const float en_weight=4.0; |
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| 27 | static const float noise_thres=0.1; |
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| 28 | |
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| 29 | |
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| 30 | typedef struct Volume{ |
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| 31 | float energy; |
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| 32 | float norm_en; |
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| 33 | float gain; |
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| 34 | float static_gain; |
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| 35 | float gain_k; |
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| 36 | float thres; |
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| 37 | MSFilter *peer; |
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| 38 | bool_t ea_active; |
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| 39 | }Volume; |
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| 40 | |
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| 41 | static void volume_init(MSFilter *f){ |
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| 42 | Volume *v=(Volume*)ms_new(Volume,1); |
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| 43 | v->energy=0; |
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| 44 | v->norm_en=0; |
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| 45 | v->static_gain=v->gain=1; |
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| 46 | v->ea_active=FALSE; |
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| 47 | v->gain_k=gain_k; |
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| 48 | v->thres=noise_thres; |
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| 49 | v->peer=NULL; |
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| 50 | f->data=v; |
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| 51 | } |
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| 52 | |
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| 53 | static void volume_uninit(MSFilter *f){ |
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| 54 | ms_free(f->data); |
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| 55 | } |
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| 56 | |
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| 57 | static int volume_get(MSFilter *f, void *arg){ |
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| 58 | float *farg=(float*)arg; |
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| 59 | Volume *v=(Volume*)f->data; |
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| 60 | *farg=10*log10f((v->energy+1)/max_e); |
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| 61 | return 0; |
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| 62 | } |
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| 63 | |
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| 64 | static int volume_get_linear(MSFilter *f, void *arg){ |
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| 65 | float *farg=(float*)arg; |
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| 66 | Volume *v=(Volume*)f->data; |
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| 67 | *farg=(v->energy+1)/max_e; |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |
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| 71 | static inline float compute_gain(float static_gain, float energy, float weight){ |
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| 72 | float ret=static_gain*(1 - (energy*weight)); |
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| 73 | if (ret<0) ret=0; |
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| 74 | return ret; |
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| 75 | } |
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| 76 | |
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| 77 | static void volume_echo_avoider_process(Volume *v){ |
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| 78 | float peer_e; |
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| 79 | float gain; |
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| 80 | float gain_k2; |
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| 81 | ms_filter_call_method(v->peer,MS_VOLUME_GET_LINEAR,&peer_e); |
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| 82 | peer_e=sqrt(peer_e); |
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| 83 | if (v->ea_active){ |
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| 84 | if (peer_e>v->thres){ |
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| 85 | /*lower our output*/ |
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| 86 | gain=compute_gain(v->static_gain,peer_e,en_weight); |
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| 87 | }else { |
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| 88 | gain=v->static_gain; |
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| 89 | v->ea_active=FALSE; |
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| 90 | } |
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| 91 | }else{ |
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| 92 | int peer_active=FALSE; |
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| 93 | ms_filter_call_method(v->peer,MS_VOLUME_GET_EA_STATE,&peer_active); |
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| 94 | if (peer_e>v->thres && ! peer_active){ |
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| 95 | /*lower our output*/ |
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| 96 | gain=compute_gain(v->static_gain,peer_e,en_weight); |
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| 97 | v->ea_active=TRUE; |
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| 98 | }else gain=v->static_gain; |
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| 99 | } |
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| 100 | if (v->ea_active){ |
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| 101 | gain_k2=5*v->gain_k; |
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| 102 | }else gain_k2=v->gain_k; |
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| 103 | v->gain=(v->gain*(1-gain_k2)) + (gain_k2*gain); |
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| 104 | ms_message("ea_active=%i, peer_e=%f gain=%f gain_k=%f",v->ea_active,peer_e,v->gain, v->gain_k); |
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| 105 | } |
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| 106 | |
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| 107 | static int volume_set_gain(MSFilter *f, void *arg){ |
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| 108 | float *farg=(float*)arg; |
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| 109 | Volume *v=(Volume*)f->data; |
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| 110 | v->gain=v->static_gain=*farg; |
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| 111 | return 0; |
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| 112 | } |
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| 113 | |
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| 114 | |
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| 115 | static int volume_get_ea_state(MSFilter *f, void *arg){ |
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| 116 | int *barg=(int*)arg; |
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| 117 | Volume *v=(Volume*)f->data; |
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| 118 | *barg=v->ea_active; |
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| 119 | return 0; |
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| 120 | } |
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| 121 | |
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| 122 | static int volume_set_peer(MSFilter *f, void *arg){ |
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| 123 | MSFilter *p=(MSFilter*)arg; |
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| 124 | Volume *v=(Volume*)f->data; |
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| 125 | v->peer=p; |
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| 126 | return 0; |
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| 127 | } |
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| 128 | |
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| 129 | static int volume_set_ea_threshold(MSFilter *f, void*arg){ |
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| 130 | Volume *v=(Volume*)f->data; |
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| 131 | float val=*(float*)arg; |
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| 132 | if (val<0 || val>1) { |
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| 133 | ms_error("Error: threshold must be in range [0..1]"); |
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| 134 | return -1; |
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| 135 | } |
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| 136 | v->thres=val; |
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| 137 | return 0; |
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| 138 | } |
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| 139 | |
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| 140 | static int volume_set_ea_speed(MSFilter *f, void*arg){ |
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| 141 | Volume *v=(Volume*)f->data; |
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| 142 | float val=*(float*)arg; |
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| 143 | if (val<0 || val>1) { |
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| 144 | ms_error("Error: speed must be in range [0..1]"); |
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| 145 | return -1; |
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| 146 | } |
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| 147 | v->gain_k=val; |
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| 148 | return 0; |
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| 149 | } |
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| 150 | |
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| 151 | static inline int16_t saturate(float val){ |
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| 152 | return (val>32767) ? 32767 : ( (val<-32767) ? -32767 : val); |
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| 153 | } |
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| 154 | |
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| 155 | static void volume_process(MSFilter *f){ |
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| 156 | mblk_t *m; |
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| 157 | int16_t *sample; |
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| 158 | Volume *v=(Volume*)f->data; |
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| 159 | float en=v->energy; |
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| 160 | while((m=ms_queue_get(f->inputs[0]))!=NULL){ |
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| 161 | for ( sample=(int16_t*)m->b_rptr; |
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| 162 | sample<(int16_t*)m->b_wptr; |
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| 163 | ++sample){ |
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| 164 | float s=*sample; |
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| 165 | en=(s*s*coef) + (1.0-coef)*en; |
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| 166 | } |
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| 167 | if (v->peer){ |
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| 168 | volume_echo_avoider_process(v); |
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| 169 | } |
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| 170 | if (v->gain!=1){ |
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| 171 | for ( sample=(int16_t*)m->b_rptr; |
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| 172 | sample<(int16_t*)m->b_wptr; |
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| 173 | ++sample){ |
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| 174 | float s=*sample; |
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| 175 | *sample=saturate(s*v->gain); |
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| 176 | } |
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| 177 | } |
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| 178 | ms_queue_put(f->outputs[0],m); |
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| 179 | } |
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| 180 | v->energy=en; |
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| 181 | } |
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| 182 | |
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| 183 | static MSFilterMethod methods[]={ |
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| 184 | { MS_VOLUME_GET , volume_get }, |
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| 185 | { MS_VOLUME_GET_LINEAR , volume_get_linear }, |
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| 186 | { MS_VOLUME_SET_GAIN , volume_set_gain }, |
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| 187 | { MS_VOLUME_GET_EA_STATE , volume_get_ea_state }, |
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| 188 | { MS_VOLUME_SET_PEER , volume_set_peer }, |
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| 189 | { MS_VOLUME_SET_EA_THRESHOLD , volume_set_ea_threshold }, |
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| 190 | { MS_VOLUME_SET_EA_SPEED , volume_set_ea_speed }, |
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| 191 | { 0 , NULL } |
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| 192 | }; |
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| 193 | |
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| 194 | #ifndef _MSC_VER |
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| 195 | MSFilterDesc ms_volume_desc={ |
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| 196 | .name="MSVolume", |
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| 197 | .text=N_("A filter to make level measurements on 16 bits pcm audio stream"), |
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| 198 | .id=MS_VOLUME_ID, |
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| 199 | .category=MS_FILTER_OTHER, |
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| 200 | .ninputs=1, |
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| 201 | .noutputs=1, |
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| 202 | .init=volume_init, |
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| 203 | .uninit=volume_uninit, |
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| 204 | .process=volume_process, |
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| 205 | .methods=methods |
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| 206 | }; |
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| 207 | #else |
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| 208 | MSFilterDesc ms_volume_desc={ |
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| 209 | MS_VOLUME_ID, |
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| 210 | "MSVolume", |
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| 211 | N_("A filter to make level measurements on 16 bits pcm audio stream"), |
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| 212 | MS_FILTER_OTHER, |
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| 213 | NULL, |
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| 214 | 1, |
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| 215 | 1, |
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| 216 | volume_init, |
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| 217 | NULL, |
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| 218 | volume_process, |
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| 219 | NULL, |
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| 220 | volume_uninit, |
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| 221 | methods |
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| 222 | }; |
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| 223 | #endif |
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| 224 | |
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| 225 | MS_FILTER_DESC_EXPORT(ms_volume_desc) |
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| 226 | |
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| 227 | |
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