git.sesse.net Git - vlc/blob - modules/audio_filter/converter/mpgatofixed32.c

   1 /*****************************************************************************
   2  * mpgatofixed32.c: MPEG-1 & 2 audio layer I, II, III + MPEG 2.5 decoder,
   3  * using MAD (MPEG Audio Decoder)
   4  *****************************************************************************
   5  * Copyright (C) 2001-2005 the VideoLAN team
   6  * $Id$
   7  *
   8  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   9  *          Jean-Paul Saman <jpsaman _at_ videolan _dot_ org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <stdlib.h>                                      /* malloc(), free() */
  30 #include <string.h>                                              /* strdup() */
  31
  32 #include <mad.h>
  33
  34 #include <vlc/vlc.h>
  35 #include <vlc_aout.h>
  36 #include <vlc_block.h>
  37 #include "vlc_filter.h"
  38
  39 /*****************************************************************************
  40  * Local prototypes
  41  *****************************************************************************/
  42 static int  Create    ( vlc_object_t * );
  43 static void Destroy   ( vlc_object_t * );
  44 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
  45                         aout_buffer_t * );
  46
  47 static int  OpenFilter ( vlc_object_t * );
  48 static void CloseFilter( vlc_object_t * );
  49 static block_t *Convert( filter_t *, block_t * );
  50
  51 /*****************************************************************************
  52  * Local structures
  53  *****************************************************************************/
  54 struct filter_sys_t
  55 {
  56     struct mad_stream mad_stream;
  57     struct mad_frame mad_frame;
  58     struct mad_synth mad_synth;
  59 };
  60
  61 /*****************************************************************************
  62  * Module descriptor
  63  *****************************************************************************/
  64 vlc_module_begin();
  65     set_category( CAT_INPUT );
  66     set_subcategory( SUBCAT_INPUT_ACODEC );
  67     set_description( _("MPEG audio decoder") );
  68     set_capability( "audio filter", 100 );
  69     set_callbacks( Create, Destroy );
  70
  71     add_submodule();
  72     set_description( _("MPEG audio decoder") );
  73     set_capability( "audio filter2", 100 );
  74     set_callbacks( OpenFilter, CloseFilter );
  75 vlc_module_end();
  76
  77 /*****************************************************************************
  78  * Create:
  79  *****************************************************************************/
  80 static int Create( vlc_object_t *p_this )
  81 {
  82     aout_filter_t *p_filter = (aout_filter_t *)p_this;
  83     struct filter_sys_t *p_sys;
  84
  85     if ( (p_filter->input.i_format != VLC_FOURCC('m','p','g','a')
  86            && p_filter->input.i_format != VLC_FOURCC('m','p','g','3'))
  87             || (p_filter->output.i_format != VLC_FOURCC('f','l','3','2')
  88                  && p_filter->output.i_format != VLC_FOURCC('f','i','3','2')) )
  89     {
  90         return -1;
  91     }
  92
  93     if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
  94     {
  95         return -1;
  96     }
  97
  98     /* Allocate the memory needed to store the module's structure */
  99     p_sys = malloc( sizeof(filter_sys_t) );
 100     p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
 101     if( p_sys == NULL )
 102     {
 103         msg_Err( p_filter, "out of memory" );
 104         return -1;
 105     }
 106
 107     /* Initialize libmad */
 108     mad_stream_init( &p_sys->mad_stream );
 109     mad_frame_init( &p_sys->mad_frame );
 110     mad_synth_init( &p_sys->mad_synth );
 111     mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
 112
 113     p_filter->pf_do_work = DoWork;
 114     p_filter->b_in_place = 0;
 115
 116     return 0;
 117 }
 118
 119 /*****************************************************************************
 120  * DoWork: decode an MPEG audio frame.
 121  *****************************************************************************/
 122 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
 123                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
 124 {
 125     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
 126
 127     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
 128     p_out_buf->i_nb_bytes = p_in_buf->i_nb_samples * sizeof(vlc_fixed_t) *
 129                                aout_FormatNbChannels( &p_filter->output );
 130
 131     /* Do the actual decoding now. */
 132     mad_stream_buffer( &p_sys->mad_stream, p_in_buf->p_buffer,
 133                        p_in_buf->i_nb_bytes );
 134     if ( mad_frame_decode( &p_sys->mad_frame, &p_sys->mad_stream ) == -1 )
 135     {
 136         msg_Dbg( p_aout, "libmad error: %s",
 137                   mad_stream_errorstr( &p_sys->mad_stream ) );
 138         if( p_filter->output.i_format == VLC_FOURCC('f','l','3','2') )
 139         {
 140             int i;
 141             int i_size = p_out_buf->i_nb_bytes / sizeof(float);
 142
 143             float * a = (float *)p_out_buf->p_buffer;
 144             for ( i = 0 ; i < i_size ; i++ )
 145                 *a++ = 0.0;
 146         }
 147         else
 148         {
 149             memset( p_out_buf->p_buffer, 0, p_out_buf->i_nb_bytes );
 150         }
 151         return;
 152     }
 153
 154     mad_synth_frame( &p_sys->mad_synth, &p_sys->mad_frame );
 155
 156     if ( p_filter->output.i_format == VLC_FOURCC('f','i','3','2') )
 157     {
 158         /* Interleave and keep buffers in mad_fixed_t format */
 159         mad_fixed_t * p_samples = (mad_fixed_t *)p_out_buf->p_buffer;
 160         struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
 161         unsigned int i_samples = p_pcm->length;
 162         mad_fixed_t const * p_left = p_pcm->samples[0];
 163         mad_fixed_t const * p_right = p_pcm->samples[1];
 164
 165         switch ( p_pcm->channels )
 166         {
 167         case 2:
 168             if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
 169             {
 170                 while ( i_samples-- )
 171                 {
 172                     *p_samples++ = (*p_left++ >> 1) + (*p_right++ >> 1);
 173                 }
 174             }
 175             else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
 176             {
 177                 while ( i_samples-- )
 178                 {
 179                     *p_samples++ = *p_left;
 180                     *p_samples++ = *p_left++;
 181                 }
 182             }
 183             else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
 184             {
 185                 while ( i_samples-- )
 186                 {
 187                     *p_samples++ = *p_right;
 188                     *p_samples++ = *p_right++;
 189                 }
 190             }
 191             else
 192             {
 193                 while ( i_samples-- )
 194                 {
 195                     *p_samples++ = *p_left++;
 196                     *p_samples++ = *p_right++;
 197                 }
 198             }
 199             break;
 200
 201         case 1:
 202             p_filter->p_libvlc->pf_memcpy( p_samples, p_left,
 203                                         i_samples * sizeof(mad_fixed_t) );
 204             break;
 205
 206         default:
 207             msg_Err( p_aout, "cannot interleave %i channels",
 208                      p_pcm->channels );
 209         }
 210     }
 211     else
 212     {
 213         /* float32 */
 214         float * p_samples = (float *)p_out_buf->p_buffer;
 215         struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
 216         unsigned int i_samples = p_pcm->length;
 217         mad_fixed_t const * p_left = p_pcm->samples[0];
 218         mad_fixed_t const * p_right = p_pcm->samples[1];
 219         float f_temp = (float)FIXED32_ONE;
 220
 221         switch ( p_pcm->channels )
 222         {
 223         case 2:
 224             if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
 225             {
 226                 while ( i_samples-- )
 227                 {
 228                     *p_samples++ = (float)*p_left++ / f_temp / 2 +
 229                                    (float)*p_right++ / f_temp / 2;
 230                 }
 231             }
 232             else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
 233             {
 234                 while ( i_samples-- )
 235                 {
 236                     *p_samples++ = (float)*p_left / f_temp;
 237                     *p_samples++ = (float)*p_left++ / f_temp;
 238                 }
 239             }
 240             else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
 241             {
 242                 while ( i_samples-- )
 243                 {
 244                     *p_samples++ = (float)*p_right / f_temp;
 245                     *p_samples++ = (float)*p_right++ / f_temp;
 246                 }
 247             }
 248             else
 249             {
 250                 while ( i_samples-- )
 251                 {
 252                     *p_samples++ = (float)*p_left++ / f_temp;
 253                     *p_samples++ = (float)*p_right++ / f_temp;
 254                 }
 255             }
 256             break;
 257
 258         case 1:
 259             while ( i_samples-- )
 260             {
 261                 *p_samples++ = (float)*p_left++ / f_temp;
 262             }
 263             break;
 264
 265         default:
 266             msg_Err( p_aout, "cannot interleave %i channels",
 267                      p_pcm->channels );
 268         }
 269     }
 270 }
 271
 272 /*****************************************************************************
 273  * Destroy : deallocate data structures
 274  *****************************************************************************/
 275 static void Destroy( vlc_object_t *p_this )
 276 {
 277     aout_filter_t *p_filter = (aout_filter_t *)p_this;
 278     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
 279
 280     mad_synth_finish( &p_sys->mad_synth );
 281     mad_frame_finish( &p_sys->mad_frame );
 282     mad_stream_finish( &p_sys->mad_stream );
 283     free( p_sys );
 284 }
 285
 286 /*****************************************************************************
 287  * OpenFilter:
 288  *****************************************************************************/
 289 static int OpenFilter( vlc_object_t *p_this )
 290 {
 291     filter_t *p_filter = (filter_t *)p_this;
 292     filter_sys_t *p_sys;
 293
 294     if( p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','a') &&
 295         p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','3') )
 296     {
 297         return VLC_EGENERIC;
 298     }
 299
 300     /* Allocate the memory needed to store the module's structure */
 301     p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
 302     if( p_sys == NULL )
 303     {
 304         msg_Err( p_filter, "out of memory" );
 305         return -1;
 306     }
 307
 308     p_filter->pf_audio_filter = Convert;
 309
 310     /* Initialize libmad */
 311     mad_stream_init( &p_sys->mad_stream );
 312     mad_frame_init( &p_sys->mad_frame );
 313     mad_synth_init( &p_sys->mad_synth );
 314     mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
 315
 316     if( p_this->p_libvlc_global->i_cpu & CPU_CAPABILITY_FPU )
 317         p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
 318     else
 319         p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
 320     p_filter->fmt_out.audio.i_format = p_filter->fmt_out.i_codec;
 321
 322     p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
 323
 324     msg_Dbg( p_this, "%4.4s->%4.4s, bits per sample: %i",
 325              (char *)&p_filter->fmt_in.i_codec,
 326              (char *)&p_filter->fmt_out.i_codec,
 327              p_filter->fmt_in.audio.i_bitspersample );
 328
 329     return 0;
 330 }
 331
 332 /*****************************************************************************
 333  * CloseFilter : deallocate data structures
 334  *****************************************************************************/
 335 static void CloseFilter( vlc_object_t *p_this )
 336 {
 337     filter_t *p_filter = (filter_t *)p_this;
 338     filter_sys_t *p_sys = p_filter->p_sys;
 339
 340     mad_synth_finish( &p_sys->mad_synth );
 341     mad_frame_finish( &p_sys->mad_frame );
 342     mad_stream_finish( &p_sys->mad_stream );
 343     free( p_sys );
 344 }
 345
 346 static block_t *Convert( filter_t *p_filter, block_t *p_block )
 347 {
 348     aout_filter_t aout_filter;
 349     aout_buffer_t in_buf, out_buf;
 350     block_t *p_out;
 351     int i_out_size;
 352
 353     if( !p_block || !p_block->i_samples )
 354     {
 355         if( p_block ) p_block->pf_release( p_block );
 356         return NULL;
 357     }
 358
 359     i_out_size = p_block->i_samples *
 360       p_filter->fmt_out.audio.i_bitspersample *
 361         p_filter->fmt_out.audio.i_channels / 8;
 362
 363     p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
 364     if( !p_out )
 365     {
 366         msg_Warn( p_filter, "can't get output buffer" );
 367         p_block->pf_release( p_block );
 368         return NULL;
 369     }
 370
 371     p_out->i_samples = p_block->i_samples;
 372     p_out->i_dts = p_block->i_dts;
 373     p_out->i_pts = p_block->i_pts;
 374     p_out->i_length = p_block->i_length;
 375
 376     aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
 377     aout_filter.input = p_filter->fmt_in.audio;
 378     aout_filter.input.i_format = p_filter->fmt_in.i_codec;
 379     aout_filter.output = p_filter->fmt_out.audio;
 380     aout_filter.output.i_format = p_filter->fmt_out.i_codec;
 381
 382     in_buf.p_buffer = p_block->p_buffer;
 383     in_buf.i_nb_bytes = p_block->i_buffer;
 384     in_buf.i_nb_samples = p_block->i_samples;
 385     out_buf.p_buffer = p_out->p_buffer;
 386     out_buf.i_nb_bytes = p_out->i_buffer;
 387     out_buf.i_nb_samples = p_out->i_samples;
 388
 389     DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
 390
 391     p_block->pf_release( p_block );
 392
 393     p_out->i_buffer = out_buf.i_nb_bytes;
 394     p_out->i_samples = out_buf.i_nb_samples;
 395
 396     return p_out;
 397 }