git.sesse.net Git - vlc/blob - modules/audio_filter/channel_mixer/simple.c

   1 /*****************************************************************************
   2  * simple.c : simple channel mixer plug-in (only 7/7.1/5/5.1 -> Stereo for now)
   3  *****************************************************************************
   4  * Copyright (C) 2002, 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_aout.h>
  34 #include <vlc_filter.h>
  35 #include <vlc_block.h>
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 static int  Create    ( vlc_object_t * );
  41
  42 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
  43                         aout_buffer_t * );
  44
  45 static int  OpenFilter ( vlc_object_t * );
  46 static block_t *Filter( filter_t *, block_t * );
  47
  48 /*****************************************************************************
  49  * Module descriptor
  50  *****************************************************************************/
  51 vlc_module_begin();
  52     set_description( N_("Audio filter for simple channel mixing") );
  53     set_capability( "audio filter", 10 );
  54     set_category( CAT_AUDIO );
  55     set_subcategory( SUBCAT_AUDIO_MISC );
  56     set_callbacks( Create, NULL );
  57
  58     add_submodule();
  59     set_description( N_("audio filter for simple channel mixing") );
  60     set_capability( "audio filter2", 10 );
  61     set_callbacks( OpenFilter, NULL );
  62 vlc_module_end();
  63
  64 /*****************************************************************************
  65  * Create: allocate trivial channel mixer
  66  *****************************************************************************/
  67 static int Create( vlc_object_t *p_this )
  68 {
  69     aout_filter_t * p_filter = (aout_filter_t *)p_this;
  70
  71     if ( (p_filter->input.i_physical_channels
  72            == p_filter->output.i_physical_channels
  73            && p_filter->input.i_original_channels
  74                == p_filter->output.i_original_channels)
  75           || p_filter->input.i_format != p_filter->output.i_format
  76           || p_filter->input.i_rate != p_filter->output.i_rate
  77           || p_filter->input.i_format != VLC_FOURCC('f','l','3','2') )
  78     {
  79         return -1;
  80     }
  81
  82     /* Only conversion to Mono, Stereo and 4.0 right now */
  83     if( p_filter->output.i_physical_channels !=
  84         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)
  85         && p_filter->output.i_physical_channels !=
  86         ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
  87         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT)
  88         && p_filter->output.i_physical_channels != AOUT_CHAN_CENTER )
  89     {
  90         return -1;
  91     }
  92
  93     /* Only from 7/7.1/5/5.1/2.0 */
  94     if( (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
  95         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
  96          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
  97         (p_filter->input.i_physical_channels & ~AOUT_CHAN_LFE) !=
  98         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
  99          AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
 100          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
 101         p_filter->input.i_physical_channels !=
 102         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
 103     {
 104         return -1;
 105     }
 106
 107     p_filter->pf_do_work = DoWork;
 108     p_filter->b_in_place = 0;
 109
 110     return 0;
 111 }
 112
 113 /*****************************************************************************
 114  * DoWork: convert a buffer
 115  *****************************************************************************/
 116 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
 117                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
 118 {
 119     VLC_UNUSED(p_aout);
 120     int i_input_nb = aout_FormatNbChannels( &p_filter->input );
 121     int i_output_nb = aout_FormatNbChannels( &p_filter->output );
 122     float *p_dest = (float *)p_out_buf->p_buffer;
 123     float *p_src = (float *)p_in_buf->p_buffer;
 124     int i;
 125
 126     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
 127     p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes * i_output_nb / i_input_nb;
 128
 129     if( p_filter->output.i_physical_channels ==
 130                             (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
 131     {
 132         if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
 133         for( i = p_in_buf->i_nb_samples; i--; )
 134         {
 135             *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 4 + p_src[4] / 4;
 136             p_dest++;
 137             *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 4 + p_src[5] / 4;
 138             p_dest++;
 139
 140             p_src += 7;
 141
 142             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
 143         }
 144         else
 145         for( i = p_in_buf->i_nb_samples; i--; )
 146         {
 147             *p_dest = p_src[4] + 0.5 * p_src[0] + 0.33 * p_src[2];
 148             p_dest++;
 149             *p_dest = p_src[4] + 0.5 * p_src[1] + 0.33 * p_src[3];
 150             p_dest++;
 151
 152             p_src += 5;
 153
 154             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
 155         }
 156     }
 157     else if( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
 158     {
 159         if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
 160         for( i = p_in_buf->i_nb_samples; i--; )
 161         {
 162             *p_dest = p_src[6] + p_src[0] / 4 + p_src[1] / 4 + p_src[2] / 8 + p_src[3] / 8 + p_src[4] / 8 + p_src[5] / 8;
 163             p_dest++;
 164
 165             p_src += 7;
 166
 167             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
 168         }
 169         else if( p_filter->input.i_physical_channels & AOUT_CHAN_REARLEFT )
 170         for( i = p_in_buf->i_nb_samples; i--; )
 171         {
 172             *p_dest = p_src[4] + p_src[0] / 4 + p_src[1] / 4 + p_src[2] / 6 + p_src[3] / 6;
 173             p_dest++;
 174
 175             p_src += 5;
 176
 177             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
 178         }
 179         else
 180         for( i = p_in_buf->i_nb_samples; i--; )
 181         {
 182             *p_dest = p_src[0] / 2 + p_src[1] / 2;
 183             p_dest++;
 184
 185             p_src += 2;
 186         }
 187     }
 188     else
 189     {
 190         if( p_filter->input.i_physical_channels & AOUT_CHAN_MIDDLELEFT )
 191         for( i = p_in_buf->i_nb_samples; i--; )
 192         {
 193             *p_dest = p_src[6] + 0.5 * p_src[0] + p_src[2] / 6;
 194             p_dest++;
 195             *p_dest = p_src[6] + 0.5 * p_src[1] + p_src[3] / 6;
 196             p_dest++;
 197             *p_dest = p_src[2] / 6 +  p_src[4];
 198             p_dest++;
 199             *p_dest = p_src[3] / 6 +  p_src[5];
 200             p_dest++;
 201
 202             p_src += 7;
 203
 204             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
 205         }
 206         else
 207         for( i = p_in_buf->i_nb_samples; i--; )
 208         {
 209             *p_dest = p_src[4] + 0.5 * p_src[0];
 210             p_dest++;
 211             *p_dest = p_src[4] + 0.5 * p_src[1];
 212             p_dest++;
 213             *p_dest = p_src[2];
 214             p_dest++;
 215             *p_dest = p_src[3];
 216             p_dest++;
 217
 218             p_src += 5;
 219
 220             if( p_filter->input.i_physical_channels & AOUT_CHAN_LFE ) p_src++;
 221         }
 222
 223     }
 224 }
 225
 226 /*****************************************************************************
 227  * OpenFilter:
 228  *****************************************************************************/
 229 static int OpenFilter( vlc_object_t *p_this )
 230 {
 231     filter_t *p_filter = (filter_t *)p_this;
 232
 233     if ( (p_filter->fmt_in.audio.i_physical_channels
 234            == p_filter->fmt_out.audio.i_physical_channels
 235            && p_filter->fmt_in.audio.i_original_channels
 236                == p_filter->fmt_out.audio.i_original_channels)
 237           || p_filter->fmt_in.i_codec != p_filter->fmt_out.i_codec
 238           || p_filter->fmt_in.audio.i_rate != p_filter->fmt_out.audio.i_rate
 239           || p_filter->fmt_in.i_codec != VLC_FOURCC('f','l','3','2') )
 240     {
 241         return -1;
 242     }
 243
 244     /* Only conversion to Mono, Stereo and 4.0 right now */
 245     if( p_filter->fmt_out.audio.i_physical_channels !=
 246         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)
 247         && p_filter->fmt_out.audio.i_physical_channels !=
 248         ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 249         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT)
 250         && p_filter->fmt_out.audio.i_physical_channels != AOUT_CHAN_CENTER )
 251     {
 252         return -1;
 253     }
 254
 255     /* Only from 7/7.1/5/5.1/2.0 */
 256     if( (p_filter->fmt_in.audio.i_physical_channels & ~AOUT_CHAN_LFE) !=
 257         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
 258          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
 259         (p_filter->fmt_in.audio.i_physical_channels & ~AOUT_CHAN_LFE) !=
 260         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
 261          AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
 262          AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT) &&
 263         p_filter->fmt_in.audio.i_physical_channels !=
 264         (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
 265     {
 266         return -1;
 267     }
 268
 269     p_filter->pf_audio_filter = Filter;
 270
 271     return 0;
 272 }
 273
 274 /*****************************************************************************
 275  * Filter:
 276  *****************************************************************************/
 277 static block_t *Filter( filter_t *p_filter, block_t *p_block )
 278 {
 279     aout_filter_t aout_filter;
 280     aout_buffer_t in_buf, out_buf;
 281     block_t *p_out;
 282     int i_out_size;
 283
 284     if( !p_block || !p_block->i_samples )
 285     {
 286         if( p_block ) p_block->pf_release( p_block );
 287         return NULL;
 288     }
 289
 290     i_out_size = p_block->i_samples *
 291       p_filter->fmt_out.audio.i_bitspersample *
 292         p_filter->fmt_out.audio.i_channels / 8;
 293
 294     p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
 295     if( !p_out )
 296     {
 297         msg_Warn( p_filter, "can't get output buffer" );
 298         p_block->pf_release( p_block );
 299         return NULL;
 300     }
 301
 302     p_out->i_samples = p_block->i_samples;
 303     p_out->i_dts = p_block->i_dts;
 304     p_out->i_pts = p_block->i_pts;
 305     p_out->i_length = p_block->i_length;
 306
 307     aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
 308     aout_filter.input = p_filter->fmt_in.audio;
 309     aout_filter.input.i_format = p_filter->fmt_in.i_codec;
 310     aout_filter.output = p_filter->fmt_out.audio;
 311     aout_filter.output.i_format = p_filter->fmt_out.i_codec;
 312
 313     in_buf.p_buffer = p_block->p_buffer;
 314     in_buf.i_nb_bytes = p_block->i_buffer;
 315     in_buf.i_nb_samples = p_block->i_samples;
 316     out_buf.p_buffer = p_out->p_buffer;
 317     out_buf.i_nb_bytes = p_out->i_buffer;
 318     out_buf.i_nb_samples = p_out->i_samples;
 319
 320     DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
 321
 322     p_block->pf_release( p_block );
 323
 324     p_out->i_buffer = out_buf.i_nb_bytes;
 325     p_out->i_samples = out_buf.i_nb_samples;
 326
 327     return p_out;
 328 }
 329