mirror of
https://code.videolan.org/videolan/vlc
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240 lines
8.0 KiB
C
240 lines
8.0 KiB
C
/*****************************************************************************
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* normvol.c : volume normalizer
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*****************************************************************************
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* Copyright (C) 2001 VideoLAN
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* $Id$
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*
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* Authors: Clément Stenac <zorglub@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, USA.
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*****************************************************************************/
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/*
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* TODO:
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*
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* We should detect fast power increases and react faster to these
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* This way, we can increase the buffer size to get a more stable filter */
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* malloc(), free() */
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#include <string.h>
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#include <errno.h> /* ENOMEM */
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#include <stdio.h>
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#include <ctype.h>
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#include <signal.h>
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#include <math.h>
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#include <vlc/vlc.h>
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#include <vlc/aout.h>
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#include <aout_internal.h>
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close ( vlc_object_t * );
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static void DoWork ( aout_instance_t * , aout_filter_t *,
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aout_buffer_t * , aout_buffer_t *);
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typedef struct aout_filter_sys_t
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{
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int i_nb;
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float *p_last;
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float f_max;
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} aout_filter_sys_t;
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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#define BUFF_TEXT N_("Number of audio buffers" )
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#define BUFF_LONGTEXT N_("This is the number of audio buffers on which the " \
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"power measurement is made. A higher number of buffers will " \
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"increase the response time of the filter to a high " \
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"power but will make it less sensitive to short variations." )
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#define LEVEL_TEXT N_("Max level" )
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#define LEVEL_LONGTEXT N_("If the average power over the last N buffers " \
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"is higher than this value, the volume will be normalized. " \
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"This value is a positive floating point number. A value " \
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"between 0.5 and 10 seems sensible." )
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vlc_module_begin();
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set_description( _("Volume normalizer") );
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set_shortname( N_("Volume normalizer") );
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set_category( CAT_AUDIO );
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set_subcategory( SUBCAT_AUDIO_AFILTER );
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add_shortcut( "volnorm" );
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add_integer( "norm-buff-size", 20 ,NULL ,BUFF_TEXT, BUFF_LONGTEXT,
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VLC_TRUE);
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add_float( "norm-max-level", 2.0, NULL, LEVEL_TEXT,
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LEVEL_LONGTEXT, VLC_TRUE );
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set_capability( "audio filter", 0 );
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set_callbacks( Open, Close );
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vlc_module_end();
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/*****************************************************************************
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* Open: initialize and create stuff
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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aout_filter_t *p_filter = (aout_filter_t*)p_this;
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int i_channels;
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aout_filter_sys_t *p_sys = p_filter->p_sys =
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malloc( sizeof( aout_filter_sys_t ) );
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if( p_filter->input.i_format != VLC_FOURCC('f','l','3','2' ) ||
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p_filter->output.i_format != VLC_FOURCC('f','l','3','2') )
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{
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msg_Warn( p_filter, "Bad input or output format" );
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return VLC_EGENERIC;
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}
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if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
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{
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msg_Warn( p_filter, "input and output formats are not similar" );
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return VLC_EGENERIC;
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}
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p_filter->pf_do_work = DoWork;
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p_filter->b_in_place = VLC_TRUE;
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i_channels = aout_FormatNbChannels( &p_filter->input );
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p_sys->i_nb = var_CreateGetInteger( p_filter->p_parent, "norm-buff-size" );
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p_sys->f_max = var_CreateGetFloat( p_filter->p_parent, "norm-max-level" );
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if( p_sys->f_max <= 0 ) p_sys->f_max = 0.01;
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/* We need to store (nb_buffers+1)*nb_channels floats */
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p_sys->p_last = malloc( sizeof( float ) * (i_channels) *
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(p_filter->p_sys->i_nb + 2) );
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memset( p_sys->p_last, 0 ,sizeof( float ) * (i_channels) *
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(p_filter->p_sys->i_nb + 2) );
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* DoWork : normalizes and sends a buffer
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*****************************************************************************/
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static void DoWork( aout_instance_t *p_aout, aout_filter_t *p_filter,
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aout_buffer_t *p_in_buf, aout_buffer_t *p_out_buf )
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{
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float *pf_sum;
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float *pf_gain;
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float f_average = 0;
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int i, i_chan;
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int i_samples = p_in_buf->i_nb_samples;
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int i_channels = aout_FormatNbChannels( &p_filter->input );
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float *p_out = (float*)p_out_buf->p_buffer;
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float *p_in = (float*)p_in_buf->p_buffer;
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struct aout_filter_sys_t *p_sys = p_filter->p_sys;
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pf_sum = (float *)malloc( sizeof(float) * i_channels );
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memset( pf_sum, 0, sizeof(float) * i_channels );
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pf_gain = (float *)malloc( sizeof(float) * i_channels );
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p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
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p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes;
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/* Calculate the average power level on this buffer */
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for( i = 0 ; i < i_samples; i++ )
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{
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for( i_chan = 0; i_chan < i_channels; i_chan++ )
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{
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float f_sample = p_in[i_chan];
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float f_square = pow( f_sample, 2 );
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pf_sum[i_chan] += f_square;
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}
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p_in += i_channels;
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}
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/* sum now contains for each channel the sigma(value²) */
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for( i_chan = 0; i_chan < i_channels; i_chan++ )
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{
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/* Shift our lastbuff */
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memmove( &p_sys->p_last[ i_chan * p_sys->i_nb],
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&p_sys->p_last[i_chan * p_sys->i_nb + 1],
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(p_sys->i_nb-1) * sizeof( float ) );
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/* Insert the new average : sqrt(sigma(value²)) */
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p_sys->p_last[ i_chan * p_sys->i_nb + p_sys->i_nb - 1] =
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sqrt( pf_sum[i_chan] );
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pf_sum[i_chan] = 0;
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/* Get the average power on the lastbuff */
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f_average = 0;
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for( i = 0; i < p_sys->i_nb ; i++)
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{
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f_average += p_sys->p_last[ i_chan * p_sys->i_nb + i ];
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}
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f_average = f_average / p_sys->i_nb;
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/* Seuil arbitraire */
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p_sys->f_max = var_GetFloat( p_aout, "norm-max-level" );
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//fprintf(stderr,"Average %f, max %f\n", f_average, p_sys->f_max );
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if( f_average > p_sys->f_max )
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{
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pf_gain[i_chan] = f_average / p_sys->f_max;
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}
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else
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{
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pf_gain[i_chan] = 1;
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}
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}
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/* Apply gain */
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for( i = 0; i < i_samples; i++)
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{
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for( i_chan = 0; i_chan < i_channels; i_chan++ )
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{
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p_out[i_chan] /= pf_gain[i_chan];
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}
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p_out += i_channels;
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}
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free( pf_sum );
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free( pf_gain );
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return;
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}
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/**********************************************************************
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* Close
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**********************************************************************/
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static void Close( vlc_object_t *p_this )
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{
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aout_filter_t *p_filter = (aout_filter_t*)p_this;
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aout_filter_sys_t *p_sys = p_filter->p_sys;
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if( p_sys )
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{
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if( p_sys->p_last) free( p_sys->p_last );
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free( p_sys );
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}
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}
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