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     int               i_reject_count;
  61 };
  62
  63 /*****************************************************************************
  64  * Module descriptor
  65  *****************************************************************************/
  66 vlc_module_begin();
  67     set_category( CAT_INPUT );
  68     set_subcategory( SUBCAT_INPUT_ACODEC );
  69     set_description( _("MPEG audio decoder") );
  70     set_capability( "audio filter", 100 );
  71     set_callbacks( Create, Destroy );
  72
  73     add_submodule();
  74     set_description( _("MPEG audio decoder") );
  75     set_capability( "audio filter2", 100 );
  76     set_callbacks( OpenFilter, CloseFilter );
  77 vlc_module_end();
  78
  79 /*****************************************************************************
  80  * Create:
  81  *****************************************************************************/
  82 static int Create( vlc_object_t *p_this )
  83 {
  84     aout_filter_t *p_filter = (aout_filter_t *)p_this;
  85     struct filter_sys_t *p_sys;
  86
  87     if ( (p_filter->input.i_format != VLC_FOURCC('m','p','g','a')
  88            && p_filter->input.i_format != VLC_FOURCC('m','p','g','3'))
  89             || (p_filter->output.i_format != VLC_FOURCC('f','l','3','2')
  90                  && p_filter->output.i_format != VLC_FOURCC('f','i','3','2')) )
  91     {
  92         return -1;
  93     }
  94
  95     if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
  96     {
  97         return -1;
  98     }
  99
 100     /* Allocate the memory needed to store the module's structure */
 101     p_sys = malloc( sizeof(filter_sys_t) );
 102     p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
 103     if( p_sys == NULL )
 104     {
 105         msg_Err( p_filter, "out of memory" );
 106         return -1;
 107     }
 108
 109     /* Initialize libmad */
 110     mad_stream_init( &p_sys->mad_stream );
 111     mad_frame_init( &p_sys->mad_frame );
 112     mad_synth_init( &p_sys->mad_synth );
 113     mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
 114     p_sys->i_reject_count = 0;
 115
 116     p_filter->pf_do_work = DoWork;
 117     p_filter->b_in_place = 0;
 118
 119     return 0;
 120 }
 121
 122 /*****************************************************************************
 123  * DoWork: decode an MPEG audio frame.
 124  *****************************************************************************/
 125 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
 126                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
 127 {
 128     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
 129
 130     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
 131     p_out_buf->i_nb_bytes = p_in_buf->i_nb_samples * sizeof(vlc_fixed_t) *
 132                                aout_FormatNbChannels( &p_filter->output );
 133
 134     /* Do the actual decoding now. */
 135     mad_stream_buffer( &p_sys->mad_stream, p_in_buf->p_buffer,
 136                        p_in_buf->i_nb_bytes );
 137     if ( mad_frame_decode( &p_sys->mad_frame, &p_sys->mad_stream ) == -1 )
 138     {
 139         msg_Dbg( p_aout, "libmad error: %s",
 140                   mad_stream_errorstr( &p_sys->mad_stream ) );
 141         p_sys->i_reject_count = 3;
 142     }
 143     else if( p_in_buf->b_discontinuity )
 144     {
 145         p_sys->i_reject_count = 3;
 146     }
 147
 148     if( p_sys->i_reject_count > 0 )
 149     {
 150         if( p_filter->output.i_format == VLC_FOURCC('f','l','3','2') )
 151         {
 152             int i;
 153             int i_size = p_out_buf->i_nb_bytes / sizeof(float);
 154
 155             float * a = (float *)p_out_buf->p_buffer;
 156             for ( i = 0 ; i < i_size ; i++ )
 157                 *a++ = 0.0;
 158         }
 159         else
 160         {
 161             memset( p_out_buf->p_buffer, 0, p_out_buf->i_nb_bytes );
 162         }
 163         p_sys->i_reject_count--;
 164         return;
 165     }
 166
 167
 168     mad_synth_frame( &p_sys->mad_synth, &p_sys->mad_frame );
 169
 170     if ( p_filter->output.i_format == VLC_FOURCC('f','i','3','2') )
 171     {
 172         /* Interleave and keep buffers in mad_fixed_t format */
 173         mad_fixed_t * p_samples = (mad_fixed_t *)p_out_buf->p_buffer;
 174         struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
 175         unsigned int i_samples = p_pcm->length;
 176         mad_fixed_t const * p_left = p_pcm->samples[0];
 177         mad_fixed_t const * p_right = p_pcm->samples[1];
 178
 179         switch ( p_pcm->channels )
 180         {
 181         case 2:
 182             if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
 183             {
 184                 while ( i_samples-- )
 185                 {
 186                     *p_samples++ = (*p_left++ >> 1) + (*p_right++ >> 1);
 187                 }
 188             }
 189             else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
 190             {
 191                 while ( i_samples-- )
 192                 {
 193                     *p_samples++ = *p_left;
 194                     *p_samples++ = *p_left++;
 195                 }
 196             }
 197             else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
 198             {
 199                 while ( i_samples-- )
 200                 {
 201                     *p_samples++ = *p_right;
 202                     *p_samples++ = *p_right++;
 203                 }
 204             }
 205             else
 206             {
 207                 while ( i_samples-- )
 208                 {
 209                     *p_samples++ = *p_left++;
 210                     *p_samples++ = *p_right++;
 211                 }
 212             }
 213             break;
 214
 215         case 1:
 216             p_filter->p_libvlc->pf_memcpy( p_samples, p_left,
 217                                         i_samples * sizeof(mad_fixed_t) );
 218             break;
 219
 220         default:
 221             msg_Err( p_aout, "cannot interleave %i channels",
 222                      p_pcm->channels );
 223         }
 224     }
 225     else
 226     {
 227         /* float32 */
 228         float * p_samples = (float *)p_out_buf->p_buffer;
 229         struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
 230         unsigned int i_samples = p_pcm->length;
 231         mad_fixed_t const * p_left = p_pcm->samples[0];
 232         mad_fixed_t const * p_right = p_pcm->samples[1];
 233         float f_temp = (float)FIXED32_ONE;
 234
 235         switch ( p_pcm->channels )
 236         {
 237         case 2:
 238             if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
 239             {
 240                 while ( i_samples-- )
 241                 {
 242                     *p_samples++ = (float)*p_left++ / f_temp / 2 +
 243                                    (float)*p_right++ / f_temp / 2;
 244                 }
 245             }
 246             else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
 247             {
 248                 while ( i_samples-- )
 249                 {
 250                     *p_samples++ = (float)*p_left / f_temp;
 251                     *p_samples++ = (float)*p_left++ / f_temp;
 252                 }
 253             }
 254             else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
 255             {
 256                 while ( i_samples-- )
 257                 {
 258                     *p_samples++ = (float)*p_right / f_temp;
 259                     *p_samples++ = (float)*p_right++ / f_temp;
 260                 }
 261             }
 262             else
 263             {
 264                 while ( i_samples-- )
 265                 {
 266                     *p_samples++ = (float)*p_left++ / f_temp;
 267                     *p_samples++ = (float)*p_right++ / f_temp;
 268                 }
 269             }
 270             break;
 271
 272         case 1:
 273             while ( i_samples-- )
 274             {
 275                 *p_samples++ = (float)*p_left++ / f_temp;
 276             }
 277             break;
 278
 279         default:
 280             msg_Err( p_aout, "cannot interleave %i channels",
 281                      p_pcm->channels );
 282         }
 283     }
 284 }
 285
 286 /*****************************************************************************
 287  * Destroy : deallocate data structures
 288  *****************************************************************************/
 289 static void Destroy( vlc_object_t *p_this )
 290 {
 291     aout_filter_t *p_filter = (aout_filter_t *)p_this;
 292     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
 293
 294     mad_synth_finish( &p_sys->mad_synth );
 295     mad_frame_finish( &p_sys->mad_frame );
 296     mad_stream_finish( &p_sys->mad_stream );
 297     free( p_sys );
 298 }
 299
 300 /*****************************************************************************
 301  * OpenFilter:
 302  *****************************************************************************/
 303 static int OpenFilter( vlc_object_t *p_this )
 304 {
 305     filter_t *p_filter = (filter_t *)p_this;
 306     filter_sys_t *p_sys;
 307
 308     if( p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','a') &&
 309         p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','3') )
 310     {
 311         return VLC_EGENERIC;
 312     }
 313
 314     /* Allocate the memory needed to store the module's structure */
 315     p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
 316     if( p_sys == NULL )
 317     {
 318         msg_Err( p_filter, "out of memory" );
 319         return -1;
 320     }
 321     p_sys->i_reject_count = 0;
 322
 323     p_filter->pf_audio_filter = Convert;
 324
 325     /* Initialize libmad */
 326     mad_stream_init( &p_sys->mad_stream );
 327     mad_frame_init( &p_sys->mad_frame );
 328     mad_synth_init( &p_sys->mad_synth );
 329     mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
 330
 331     if( vlc_CPU() & CPU_CAPABILITY_FPU )
 332         p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
 333     else
 334         p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
 335     p_filter->fmt_out.audio.i_format = p_filter->fmt_out.i_codec;
 336
 337     p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
 338
 339     msg_Dbg( p_this, "%4.4s->%4.4s, bits per sample: %i",
 340              (char *)&p_filter->fmt_in.i_codec,
 341              (char *)&p_filter->fmt_out.i_codec,
 342              p_filter->fmt_in.audio.i_bitspersample );
 343
 344     return 0;
 345 }
 346
 347 /*****************************************************************************
 348  * CloseFilter : deallocate data structures
 349  *****************************************************************************/
 350 static void CloseFilter( vlc_object_t *p_this )
 351 {
 352     filter_t *p_filter = (filter_t *)p_this;
 353     filter_sys_t *p_sys = p_filter->p_sys;
 354
 355     mad_synth_finish( &p_sys->mad_synth );
 356     mad_frame_finish( &p_sys->mad_frame );
 357     mad_stream_finish( &p_sys->mad_stream );
 358     free( p_sys );
 359 }
 360
 361 static block_t *Convert( filter_t *p_filter, block_t *p_block )
 362 {
 363     aout_filter_t aout_filter;
 364     aout_buffer_t in_buf, out_buf;
 365     block_t *p_out;
 366     int i_out_size;
 367
 368     if( !p_block || !p_block->i_samples )
 369     {
 370         if( p_block ) p_block->pf_release( p_block );
 371         return NULL;
 372     }
 373
 374     i_out_size = p_block->i_samples *
 375       p_filter->fmt_out.audio.i_bitspersample *
 376         p_filter->fmt_out.audio.i_channels / 8;
 377
 378     p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
 379     if( !p_out )
 380     {
 381         msg_Warn( p_filter, "can't get output buffer" );
 382         p_block->pf_release( p_block );
 383         return NULL;
 384     }
 385
 386     p_out->i_samples = p_block->i_samples;
 387     p_out->i_dts = p_block->i_dts;
 388     p_out->i_pts = p_block->i_pts;
 389     p_out->i_length = p_block->i_length;
 390
 391     aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
 392     aout_filter.input = p_filter->fmt_in.audio;
 393     aout_filter.input.i_format = p_filter->fmt_in.i_codec;
 394     aout_filter.output = p_filter->fmt_out.audio;
 395     aout_filter.output.i_format = p_filter->fmt_out.i_codec;
 396
 397     in_buf.p_buffer = p_block->p_buffer;
 398     in_buf.b_discontinuity = VLC_FALSE;
 399     in_buf.i_nb_bytes = p_block->i_buffer;
 400     in_buf.i_nb_samples = p_block->i_samples;
 401     out_buf.p_buffer = p_out->p_buffer;
 402     out_buf.i_nb_bytes = p_out->i_buffer;
 403     out_buf.i_nb_samples = p_out->i_samples;
 404
 405     DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
 406
 407     p_block->pf_release( p_block );
 408
 409     p_out->i_buffer = out_buf.i_nb_bytes;
 410     p_out->i_samples = out_buf.i_nb_samples;
 411
 412     return p_out;
 413 }