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2b8200409c
git-svn-id: svn+ssh://svn.savannah.nongnu.org/linphone/trunk@1 3f6dc0c8-ddfe-455d-9043-3cd528dc4637
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
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mediastreamer2 library - modular sound and video processing and streaming
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Copyright (C) 2006 Simon MORLAT (simon.morlat@linphone.org)
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "mediastreamer2/msvolume.h"
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#include <math.h>
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static const float max_e=32767*32767;
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static const float coef=0.1;
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typedef struct Volume{
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float energy;
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}Volume;
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static void volume_init(MSFilter *f){
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f->data=ms_new0(Volume,1);
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}
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static void volume_uninit(MSFilter *f){
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ms_free(f->data);
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}
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static int volume_get(MSFilter *f, void *arg){
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float *farg=(float*)arg;
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Volume *v=(Volume*)f->data;
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*farg=10*log10f(v->energy/max_e);
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return 0;
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}
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static void volume_process(MSFilter *f){
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mblk_t *m;
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int16_t *sample;
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Volume *v=(Volume*)f->data;
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float en=v->energy;
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while((m=ms_queue_get(f->inputs[0]))!=NULL){
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for ( sample=(int16_t*)m->b_rptr;
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sample<(int16_t*)m->b_wptr;
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++sample){
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float s=*sample;
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en=(s*s*coef) + (1.0-coef)*en;
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}
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ms_queue_put(f->outputs[0],m);
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}
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v->energy=en;
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}
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static MSFilterMethod methods[]={
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{ MS_VOLUME_GET , volume_get },
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{ 0 , NULL }
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};
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#ifndef _MSC_VER
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MSFilterDesc ms_volume_desc={
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.name="MSVolume",
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.text="A filter to make level measurements on 16 bits pcm audio stream",
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.id=MS_VOLUME_ID,
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.category=MS_FILTER_OTHER,
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.ninputs=1,
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.noutputs=1,
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.init=volume_init,
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.uninit=volume_uninit,
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.process=volume_process,
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.methods=methods
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};
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#else
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MSFilterDesc ms_volume_desc={
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MS_VOLUME_ID,
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"MSVolume",
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"A filter to make level measurements on 16 bits pcm audio stream",
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MS_FILTER_OTHER,
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NULL,
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1,
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1,
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volume_init,
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NULL,
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volume_process,
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NULL,
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volume_uninit,
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methods
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};
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#endif
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