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
  30 #include <mad.h>
  31
  32 #ifdef HAVE_CONFIG_H
  33 # include "config.h"
  34 #endif
  35
  36 #include <vlc_common.h>
  37 #include <vlc_plugin.h>
  38 #include <vlc_aout.h>
  39 #include <vlc_block.h>
  40 #include "vlc_filter.h"
  41
  42 /*****************************************************************************
  43  * Local prototypes
  44  *****************************************************************************/
  45 static int  Create    ( vlc_object_t * );
  46 static void Destroy   ( vlc_object_t * );
  47 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
  48                         aout_buffer_t * );
  49
  50 static int  OpenFilter ( vlc_object_t * );
  51 static void CloseFilter( vlc_object_t * );
  52 static block_t *Convert( filter_t *, block_t * );
  53
  54 /*****************************************************************************
  55  * Local structures
  56  *****************************************************************************/
  57 struct filter_sys_t
  58 {
  59     struct mad_stream mad_stream;
  60     struct mad_frame  mad_frame;
  61     struct mad_synth  mad_synth;
  62
  63     int               i_reject_count;
  64 };
  65
  66 /*****************************************************************************
  67  * Module descriptor
  68  *****************************************************************************/
  69 vlc_module_begin();
  70     set_category( CAT_INPUT );
  71     set_subcategory( SUBCAT_INPUT_ACODEC );
  72     set_description( N_("MPEG audio decoder") );
  73     set_capability( "audio filter", 100 );
  74     set_callbacks( Create, Destroy );
  75
  76     add_submodule();
  77     set_description( N_("MPEG audio decoder") );
  78     set_capability( "audio filter2", 100 );
  79     set_callbacks( OpenFilter, CloseFilter );
  80 vlc_module_end();
  81
  82 /*****************************************************************************
  83  * Create:
  84  *****************************************************************************/
  85 static int Create( vlc_object_t *p_this )
  86 {
  87     aout_filter_t *p_filter = (aout_filter_t *)p_this;
  88     struct filter_sys_t *p_sys;
  89
  90     if ( (p_filter->input.i_format != VLC_FOURCC('m','p','g','a')
  91            && p_filter->input.i_format != VLC_FOURCC('m','p','g','3'))
  92             || (p_filter->output.i_format != VLC_FOURCC('f','l','3','2')
  93                  && p_filter->output.i_format != VLC_FOURCC('f','i','3','2')) )
  94     {
  95         return -1;
  96     }
  97
  98     if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
  99     {
 100         return -1;
 101     }
 102
 103     /* Allocate the memory needed to store the module's structure */
 104     p_sys = malloc( sizeof(filter_sys_t) );
 105     p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
 106     if( p_sys == NULL )
 107         return -1;
 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             vlc_memcpy( p_samples, p_left, i_samples * sizeof(mad_fixed_t) );
 217             break;
 218
 219         default:
 220             msg_Err( p_aout, "cannot interleave %i channels",
 221                      p_pcm->channels );
 222         }
 223     }
 224     else
 225     {
 226         /* float32 */
 227         float * p_samples = (float *)p_out_buf->p_buffer;
 228         struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
 229         unsigned int i_samples = p_pcm->length;
 230         mad_fixed_t const * p_left = p_pcm->samples[0];
 231         mad_fixed_t const * p_right = p_pcm->samples[1];
 232         float f_temp = (float)FIXED32_ONE;
 233
 234         switch ( p_pcm->channels )
 235         {
 236         case 2:
 237             if ( p_filter->output.i_physical_channels == AOUT_CHAN_CENTER )
 238             {
 239                 while ( i_samples-- )
 240                 {
 241                     *p_samples++ = (float)*p_left++ / f_temp / 2 +
 242                                    (float)*p_right++ / f_temp / 2;
 243                 }
 244             }
 245             else if ( p_filter->output.i_original_channels == AOUT_CHAN_LEFT )
 246             {
 247                 while ( i_samples-- )
 248                 {
 249                     *p_samples++ = (float)*p_left / f_temp;
 250                     *p_samples++ = (float)*p_left++ / f_temp;
 251                 }
 252             }
 253             else if ( p_filter->output.i_original_channels == AOUT_CHAN_RIGHT )
 254             {
 255                 while ( i_samples-- )
 256                 {
 257                     *p_samples++ = (float)*p_right / f_temp;
 258                     *p_samples++ = (float)*p_right++ / f_temp;
 259                 }
 260             }
 261             else
 262             {
 263                 while ( i_samples-- )
 264                 {
 265                     *p_samples++ = (float)*p_left++ / f_temp;
 266                     *p_samples++ = (float)*p_right++ / f_temp;
 267                 }
 268             }
 269             break;
 270
 271         case 1:
 272             while ( i_samples-- )
 273             {
 274                 *p_samples++ = (float)*p_left++ / f_temp;
 275             }
 276             break;
 277
 278         default:
 279             msg_Err( p_aout, "cannot interleave %i channels",
 280                      p_pcm->channels );
 281         }
 282     }
 283 }
 284
 285 /*****************************************************************************
 286  * Destroy : deallocate data structures
 287  *****************************************************************************/
 288 static void Destroy( vlc_object_t *p_this )
 289 {
 290     aout_filter_t *p_filter = (aout_filter_t *)p_this;
 291     filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
 292
 293     mad_synth_finish( &p_sys->mad_synth );
 294     mad_frame_finish( &p_sys->mad_frame );
 295     mad_stream_finish( &p_sys->mad_stream );
 296     free( p_sys );
 297 }
 298
 299 /*****************************************************************************
 300  * OpenFilter:
 301  *****************************************************************************/
 302 static int OpenFilter( vlc_object_t *p_this )
 303 {
 304     filter_t *p_filter = (filter_t *)p_this;
 305     filter_sys_t *p_sys;
 306
 307     if( p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','a') &&
 308         p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','3') )
 309     {
 310         return VLC_EGENERIC;
 311     }
 312
 313     /* Allocate the memory needed to store the module's structure */
 314     p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
 315     if( p_sys == NULL )
 316         return -1;
 317     p_sys->i_reject_count = 0;
 318
 319     p_filter->pf_audio_filter = Convert;
 320
 321     /* Initialize libmad */
 322     mad_stream_init( &p_sys->mad_stream );
 323     mad_frame_init( &p_sys->mad_frame );
 324     mad_synth_init( &p_sys->mad_synth );
 325     mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
 326
 327     if( vlc_CPU() & CPU_CAPABILITY_FPU )
 328         p_filter->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
 329     else
 330         p_filter->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
 331     p_filter->fmt_out.audio.i_format = p_filter->fmt_out.i_codec;
 332     p_filter->fmt_out.audio.i_bitspersample =
 333         aout_BitsPerSample( p_filter->fmt_out.i_codec );
 334
 335     p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
 336
 337     msg_Dbg( p_this, "%4.4s->%4.4s, bits per sample: %i",
 338              (char *)&p_filter->fmt_in.i_codec,
 339              (char *)&p_filter->fmt_out.i_codec,
 340              p_filter->fmt_in.audio.i_bitspersample );
 341
 342     return 0;
 343 }
 344
 345 /*****************************************************************************
 346  * CloseFilter : deallocate data structures
 347  *****************************************************************************/
 348 static void CloseFilter( vlc_object_t *p_this )
 349 {
 350     filter_t *p_filter = (filter_t *)p_this;
 351     filter_sys_t *p_sys = p_filter->p_sys;
 352
 353     mad_synth_finish( &p_sys->mad_synth );
 354     mad_frame_finish( &p_sys->mad_frame );
 355     mad_stream_finish( &p_sys->mad_stream );
 356     free( p_sys );
 357 }
 358
 359 static block_t *Convert( filter_t *p_filter, block_t *p_block )
 360 {
 361     aout_filter_t aout_filter;
 362     aout_buffer_t in_buf, out_buf;
 363     block_t *p_out;
 364     int i_out_size;
 365
 366     if( !p_block || !p_block->i_samples )
 367     {
 368         if( p_block )
 369             block_Release( p_block );
 370         return NULL;
 371     }
 372
 373     i_out_size = p_block->i_samples *
 374       p_filter->fmt_out.audio.i_bitspersample *
 375         p_filter->fmt_out.audio.i_channels / 8;
 376
 377     p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
 378     if( !p_out )
 379     {
 380         msg_Warn( p_filter, "can't get output buffer" );
 381         block_Release( p_block );
 382         return NULL;
 383     }
 384
 385     p_out->i_samples = p_block->i_samples;
 386     p_out->i_dts = p_block->i_dts;
 387     p_out->i_pts = p_block->i_pts;
 388     p_out->i_length = p_block->i_length;
 389
 390     aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
 391     aout_filter.input = p_filter->fmt_in.audio;
 392     aout_filter.input.i_format = p_filter->fmt_in.i_codec;
 393     aout_filter.output = p_filter->fmt_out.audio;
 394     aout_filter.output.i_format = p_filter->fmt_out.i_codec;
 395
 396     in_buf.p_buffer = p_block->p_buffer;
 397     in_buf.b_discontinuity = false;
 398     in_buf.i_nb_bytes = p_block->i_buffer;
 399     in_buf.i_nb_samples = p_block->i_samples;
 400     out_buf.p_buffer = p_out->p_buffer;
 401     out_buf.i_nb_bytes = p_out->i_buffer;
 402     out_buf.i_nb_samples = p_out->i_samples;
 403
 404     DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
 405
 406     block_Release( p_block );
 407
 408     p_out->i_buffer = out_buf.i_nb_bytes;
 409     p_out->i_samples = out_buf.i_nb_samples;
 410
 411     return p_out;
 412 }