Commit 067ebc33 authored by gbazin's avatar gbazin
Browse files

* modules/audio_filter/channel_mixer/simple.c: very simple channel mixer for 7/7.1/5/5.1 -> Stereo.

parent be17d8e9
......@@ -949,7 +949,7 @@ VLC_ADD_PLUGINS([cvdsub svcdsub spudec subsdec dvbsub mpeg_audio lpcm a52 dts ci
VLC_ADD_PLUGINS([deinterlace invert adjust wall transform distort clone crop motionblur])
VLC_ADD_PLUGINS([float32tos16 float32tos8 float32tou16 float32tou8 a52tospdif dtstospdif fixed32tofloat32 fixed32tos16 s16tofixed32 s16tofloat32 s16tofloat32swab s8tofloat32 u8tofixed32 u8tofloat32 audio_format])
VLC_ADD_PLUGINS([trivial_resampler ugly_resampler linear_resampler bandlimited_resampler])
VLC_ADD_PLUGINS([trivial_channel_mixer headphone_channel_mixer])
VLC_ADD_PLUGINS([trivial_channel_mixer simple_channel_mixer headphone_channel_mixer])
VLC_ADD_PLUGINS([trivial_mixer spdif_mixer float32_mixer])
VLC_ADD_PLUGINS([aout_file equalizer])
VLC_ADD_PLUGINS([i420_rgb i420_yuy2 i422_yuy2 i420_ymga])
......
SOURCES_trivial_channel_mixer = trivial.c
SOURCES_simple_channel_mixer = simple.c
SOURCES_headphone_channel_mixer = headphone.c
/*****************************************************************************
* simple.c : simple channel mixer plug-in (only 7/7.1/5/5.1 -> Stereo for now)
*****************************************************************************
* Copyright (C) 2002 VideoLAN
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
#include <string.h>
#include <vlc/vlc.h>
#include "audio_output.h"
#include "aout_internal.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Create ( vlc_object_t * );
static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
aout_buffer_t * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin();
set_description( _("audio filter for simple channel mixing") );
set_capability( "audio filter", 10 );
set_callbacks( Create, NULL );
vlc_module_end();
/*****************************************************************************
* Create: allocate trivial channel mixer
*****************************************************************************/
static int Create( vlc_object_t *p_this )
{
aout_filter_t * p_filter = (aout_filter_t *)p_this;
if ( (p_filter->input.i_physical_channels
== p_filter->output.i_physical_channels
&& p_filter->input.i_original_channels
== p_filter->output.i_original_channels)
|| p_filter->input.i_format != p_filter->output.i_format
|| p_filter->input.i_rate != p_filter->output.i_rate
|| p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
{
return -1;
}
msg_Err( p_this, aout_FormatPrintChannels( &p_filter->input ) );
/* Only conversion to Stereo right now */
if( p_filter->output.i_physical_channels !=
(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) ) return -1;
/* Only from 7/7.1/5/5.1 */
if( (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
(p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) )
{
return -1;
}
p_filter->pf_do_work = DoWork;
p_filter->b_in_place = 0;
return 0;
}
/*****************************************************************************
* DoWork: convert a buffer
*****************************************************************************/
static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
{
int i_input_nb = aout_FormatNbChannels( &p_filter->input );
int i_output_nb = aout_FormatNbChannels( &p_filter->output );
float *p_dest = (float *)p_out_buf->p_buffer;
float *p_src = (float *)p_in_buf->p_buffer;
int i;
p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes * i_output_nb / i_input_nb;
if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
for( i = p_in_buf->i_nb_samples; i--; )
{
*p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
p_dest++;
*p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
p_dest++;
p_src += 7;
if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
}
else
for( i = p_in_buf->i_nb_samples; i--; )
{
*p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
p_dest++;
*p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
p_dest++;
p_src += 5;
if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
}
}
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