mirror of https://code.videolan.org/videolan/vlc
* modules/audio_filter/channel_mixer/simple.c: very simple channel mixer for 7/7.1/5/5.1 -> Stereo.
This commit is contained in:
Gildas Bazin
parent
be17d8e9bc
commit
067ebc33ce
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@ -949,7 +949,7 @@ VLC_ADD_PLUGINS([cvdsub svcdsub spudec subsdec dvbsub mpeg_audio lpcm a52 dts ci
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VLC_ADD_PLUGINS([deinterlace invert adjust wall transform distort clone crop motionblur])
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VLC_ADD_PLUGINS([float32tos16 float32tos8 float32tou16 float32tou8 a52tospdif dtstospdif fixed32tofloat32 fixed32tos16 s16tofixed32 s16tofloat32 s16tofloat32swab s8tofloat32 u8tofixed32 u8tofloat32 audio_format])
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VLC_ADD_PLUGINS([trivial_resampler ugly_resampler linear_resampler bandlimited_resampler])
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VLC_ADD_PLUGINS([trivial_channel_mixer headphone_channel_mixer])
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VLC_ADD_PLUGINS([trivial_channel_mixer simple_channel_mixer headphone_channel_mixer])
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VLC_ADD_PLUGINS([trivial_mixer spdif_mixer float32_mixer])
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VLC_ADD_PLUGINS([aout_file equalizer])
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VLC_ADD_PLUGINS([i420_rgb i420_yuy2 i422_yuy2 i420_ymga])
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@ -1,2 +1,3 @@
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SOURCES_trivial_channel_mixer = trivial.c
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SOURCES_simple_channel_mixer = simple.c
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SOURCES_headphone_channel_mixer = headphone.c
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@ -0,0 +1,132 @@
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/*****************************************************************************
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* simple.c : simple channel mixer plug-in (only 7/7.1/5/5.1 -> Stereo for now)
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*****************************************************************************
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* Copyright (C) 2002 VideoLAN
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* $Id$
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*
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* Authors: Gildas Bazin <gbazin@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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* 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 <vlc/vlc.h>
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#include "audio_output.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 Create ( vlc_object_t * );
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static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
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aout_buffer_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("audio filter for simple channel mixing") );
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set_capability( "audio filter", 10 );
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set_callbacks( Create, NULL );
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vlc_module_end();
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/*****************************************************************************
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* Create: allocate trivial channel mixer
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*****************************************************************************/
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static int Create( 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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if ( (p_filter->input.i_physical_channels
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== p_filter->output.i_physical_channels
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&& p_filter->input.i_original_channels
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== p_filter->output.i_original_channels)
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|| p_filter->input.i_format != p_filter->output.i_format
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|| p_filter->input.i_rate != p_filter->output.i_rate
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|| p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
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{
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return -1;
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}
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msg_Err( p_this, aout_FormatPrintChannels( &p_filter->input ) );
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/* Only conversion to Stereo right now */
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if( p_filter->output.i_physical_channels !=
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(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) ) return -1;
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/* Only from 7/7.1/5/5.1 */
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if( (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
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(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
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AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
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(p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
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(AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
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AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
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AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) )
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{
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return -1;
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}
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p_filter->pf_do_work = DoWork;
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p_filter->b_in_place = 0;
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return 0;
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}
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/*****************************************************************************
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* DoWork: convert 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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int i_input_nb = aout_FormatNbChannels( &p_filter->input );
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int i_output_nb = aout_FormatNbChannels( &p_filter->output );
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float *p_dest = (float *)p_out_buf->p_buffer;
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float *p_src = (float *)p_in_buf->p_buffer;
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int i;
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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 * i_output_nb / i_input_nb;
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if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
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for( i = p_in_buf->i_nb_samples; i--; )
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{
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*p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
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p_dest++;
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*p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
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p_dest++;
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p_src += 7;
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if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
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}
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else
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for( i = p_in_buf->i_nb_samples; i--; )
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{
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*p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
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p_dest++;
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*p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
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p_dest++;
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p_src += 5;
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if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
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}
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}
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