Commit 4875845b authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
Browse files

Add trivial ugly stereo karaoke filter

parent 78f2a6f1
......@@ -167,6 +167,7 @@ $Id$
* invert: inverse video filter
* iomx: IPC/OpenMaxIL for Android
* jack: jack server audio output
* karaoke: simple karaoke audio filter
* kate: kate text bitstream decoder
* libass: Subtitle renderers using libass
* libbluray: Library to access Blu-Ray drives
......
SOURCES_equalizer = equalizer.c equalizer_presets.h
SOURCES_compressor = compressor.c
SOURCES_karaoke = karaoke.c
SOURCES_normvol = normvol.c
SOURCES_audiobargraph_a = audiobargraph_a.c
SOURCES_param_eq = param_eq.c
......@@ -18,6 +19,7 @@ libvlc_LTLIBRARIES += \
libchorus_flanger_plugin.la \
libcompressor_plugin.la \
libequalizer_plugin.la \
libkaraoke_plugin.la \
libnormvol_plugin.la \
libparam_eq_plugin.la \
libscaletempo_plugin.la \
......
/*****************************************************************************
* karaoke.c : karaoke mode
*****************************************************************************
* Copyright © 2011 Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <vlc_common.h>
#include <vlc_aout.h>
#include <vlc_filter.h>
#include <vlc_plugin.h>
static int Open (vlc_object_t *);
vlc_module_begin ()
set_shortname (N_("Karaoke"))
set_description (N_("Simple Karaoke filter"))
set_category (CAT_AUDIO)
set_subcategory (SUBCAT_AUDIO_AFILTER)
set_capability ("audio filter", 0)
set_callbacks (Open, NULL)
vlc_module_end ()
static block_t *Process (filter_t *, block_t *);
static int Open (vlc_object_t *obj)
{
filter_t *filter = (filter_t *)obj;
if (filter->fmt_in.audio.i_format != VLC_CODEC_FL32
|| !AOUT_FMTS_IDENTICAL(&filter->fmt_in.audio, &filter->fmt_out.audio))
return VLC_EGENERIC;
if (filter->fmt_in.audio.i_channels != 2)
{
msg_Err (filter, "voice removal requires stereo");
return VLC_EGENERIC;
}
filter->pf_audio_filter = Process;
return VLC_SUCCESS;
}
static block_t *Process (filter_t *filter, block_t *block)
{
const float factor = .70710678 /* 1. / sqrtf (2) */;
float *spl = (float *)block->p_buffer;
for (unsigned i = block->i_nb_samples; i > 0; i--)
{
float s = (spl[0] - spl[1]) * factor;
*(spl++) = s;
*(spl++) = s;
/* TODO: set output format to mono */
}
(void) filter;
return block;
}
......@@ -300,6 +300,7 @@ modules/audio_filter/converter/format.c
modules/audio_filter/converter/mpgatofixed32.c
modules/audio_filter/equalizer.c
modules/audio_filter/equalizer_presets.h
modules/audio_filter/karaoke.c
modules/audio_filter/normvol.c
modules/audio_filter/param_eq.c
modules/audio_filter/resampler/bandlimited.c
......
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