git.sesse.net Git - vlc/blob - modules/codec/faad.c

   1 /*****************************************************************************
   2  * decoder.c: AAC decoder using libfaad2
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2003 VideoLAN
   5  * $Id: faad.c,v 1.12 2004/02/19 16:19:41 gbazin Exp $
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@netcourrier.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 #include <vlc/vlc.h>
  26 #include <vlc/aout.h>
  27 #include <vlc/decoder.h>
  28
  29 #include <faad.h>
  30
  31 /*****************************************************************************
  32  * Module descriptor
  33  *****************************************************************************/
  34 static int  Open( vlc_object_t * );
  35 static void Close( vlc_object_t * );
  36
  37 vlc_module_begin();
  38     set_description( _("AAC audio decoder (using libfaad2)") );
  39     set_capability( "decoder", 100 );
  40     set_callbacks( Open, Close );
  41 vlc_module_end();
  42
  43 /****************************************************************************
  44  * Local prototypes
  45  ****************************************************************************/
  46 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
  47 static void DoReordering( decoder_t *, uint32_t *, uint32_t *, int, int,
  48                           uint32_t * );
  49
  50 #define MAX_CHANNEL_POSITIONS 9
  51
  52 struct decoder_sys_t
  53 {
  54     /* faad handler */
  55     faacDecHandle *hfaad;
  56
  57     /* samples */
  58     audio_date_t date;
  59
  60     /* temporary buffer */
  61     uint8_t *p_buffer;
  62     int     i_buffer;
  63     int     i_buffer_size;
  64
  65     /* Channel positions of the current stream (for re-ordering) */
  66     uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
  67 };
  68
  69 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
  70     { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
  71       SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
  72       BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
  73       BACK_CHANNEL_CENTER, LFE_CHANNEL };
  74 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
  75     { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
  76       AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
  77       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
  78       AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
  79 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
  80     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
  81       AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
  82       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
  83       AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
  84     };
  85
  86 /*****************************************************************************
  87  * OpenDecoder: probe the decoder and return score
  88  *****************************************************************************/
  89 static int Open( vlc_object_t *p_this )
  90 {
  91     decoder_t *p_dec = (decoder_t*)p_this;
  92     decoder_sys_t *p_sys = p_dec->p_sys;
  93     faacDecConfiguration *cfg;
  94
  95     if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
  96     {
  97         return VLC_EGENERIC;
  98     }
  99
 100     /* Allocate the memory needed to store the decoder's structure */
 101     if( ( p_dec->p_sys = p_sys =
 102           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 103     {
 104         msg_Err( p_dec, "out of memory" );
 105         return VLC_EGENERIC;
 106     }
 107
 108     /* Open a faad context */
 109     if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
 110     {
 111         msg_Err( p_dec, "cannot initialize faad" );
 112         return VLC_EGENERIC;
 113     }
 114
 115     /* Misc init */
 116     aout_DateSet( &p_sys->date, 0 );
 117     p_dec->fmt_out.i_cat = AUDIO_ES;
 118
 119     if (p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_FPU)
 120         p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
 121     else
 122         p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
 123     p_dec->pf_decode_audio = DecodeBlock;
 124
 125     p_dec->fmt_out.audio.i_physical_channels =
 126         p_dec->fmt_out.audio.i_original_channels = 0;
 127
 128     if( p_dec->fmt_in.i_extra > 0 )
 129     {
 130         /* We have a decoder config so init the handle */
 131         unsigned long i_rate;
 132         unsigned char i_channels;
 133
 134         if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
 135                           p_dec->fmt_in.i_extra,
 136                           &i_rate, &i_channels ) < 0 )
 137         {
 138             return VLC_EGENERIC;
 139         }
 140
 141         p_dec->fmt_out.audio.i_rate = i_rate;
 142         p_dec->fmt_out.audio.i_channels = i_channels;
 143         aout_DateInit( &p_sys->date, i_rate );
 144     }
 145     else
 146     {
 147         /* Will be initalised from first frame */
 148         p_dec->fmt_out.audio.i_rate = 0;
 149         p_dec->fmt_out.audio.i_channels = 0;
 150     }
 151
 152     /* Set the faad config */
 153     cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
 154     if (p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_FPU)
 155         cfg->outputFormat = FAAD_FMT_FLOAT;
 156     else
 157         cfg->outputFormat = FAAD_FMT_16BIT;
 158     faacDecSetConfiguration( p_sys->hfaad, cfg );
 159
 160     /* buffer */
 161     p_sys->i_buffer = p_sys->i_buffer_size = 0;
 162     p_sys->p_buffer = 0;
 163
 164     return VLC_SUCCESS;
 165 }
 166
 167 /*****************************************************************************
 168  * DecodeBlock:
 169  *****************************************************************************/
 170 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 171 {
 172     decoder_sys_t *p_sys = p_dec->p_sys;
 173     block_t *p_block;
 174
 175     if( !pp_block || !*pp_block ) return NULL;
 176
 177     p_block = *pp_block;
 178
 179     if( p_block->b_discontinuity )
 180     {
 181         block_Release( p_block );
 182         return NULL;
 183     }
 184
 185     /* Append the block to the temporary buffer */
 186     if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
 187     {
 188         p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
 189         p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
 190     }
 191
 192     if( p_block->i_buffer )
 193     {
 194         memcpy( &p_sys->p_buffer[p_sys->i_buffer],
 195                 p_block->p_buffer, p_block->i_buffer );
 196         p_sys->i_buffer += p_block->i_buffer;
 197         p_block->i_buffer = 0;
 198     }
 199
 200     if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
 201     {
 202         unsigned long i_rate;
 203         unsigned char i_channels;
 204
 205         /* Init faad with the first frame */
 206         if( faacDecInit( p_sys->hfaad,
 207                          p_sys->p_buffer, p_sys->i_buffer,
 208                          &i_rate, &i_channels ) < 0 )
 209         {
 210             block_Release( p_block );
 211             return NULL;
 212         }
 213
 214         p_dec->fmt_out.audio.i_rate = i_rate;
 215         p_dec->fmt_out.audio.i_channels = i_channels;
 216         aout_DateInit( &p_sys->date, i_rate );
 217     }
 218
 219     if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
 220     {
 221         aout_DateSet( &p_sys->date, p_block->i_pts );
 222     }
 223     else if( !aout_DateGet( &p_sys->date ) )
 224     {
 225         /* We've just started the stream, wait for the first PTS. */
 226         block_Release( p_block );
 227         p_sys->i_buffer = 0;
 228         return NULL;
 229     }
 230
 231     /* Decode all data */
 232     if( p_sys->i_buffer )
 233     {
 234         void *samples;
 235         faacDecFrameInfo frame;
 236         aout_buffer_t *p_out;
 237         int i, j;
 238
 239         samples = faacDecDecode( p_sys->hfaad, &frame,
 240                                  p_sys->p_buffer, p_sys->i_buffer );
 241
 242         if( frame.error > 0 )
 243         {
 244             msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
 245
 246             /* Flush the buffer */
 247             p_sys->i_buffer = 0;
 248             block_Release( p_block );
 249             return NULL;
 250         }
 251
 252         if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
 253         {
 254             msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
 255
 256             /* Flush the buffer */
 257             p_sys->i_buffer -= frame.bytesconsumed;
 258             if( p_sys->i_buffer > 0 )
 259             {
 260                 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
 261                          p_sys->i_buffer );
 262             }
 263             block_Release( p_block );
 264             return NULL;
 265         }
 266
 267         if( frame.samples <= 0 )
 268         {
 269             msg_Warn( p_dec, "decoded zero sample" );
 270
 271             /* Flush the buffer */
 272             p_sys->i_buffer -= frame.bytesconsumed;
 273             if( p_sys->i_buffer > 0 )
 274             {
 275                 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
 276                          p_sys->i_buffer );
 277             }
 278             block_Release( p_block );
 279             return NULL;
 280         }
 281
 282         /* We decoded a valid frame */
 283         if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
 284         {
 285             aout_DateInit( &p_sys->date, frame.samplerate );
 286             aout_DateSet( &p_sys->date, p_block->i_pts );
 287         }
 288         p_block->i_pts = 0;  /* PTS is valid only once */
 289
 290         p_dec->fmt_out.audio.i_rate = frame.samplerate;
 291         p_dec->fmt_out.audio.i_channels = frame.channels;
 292
 293
 294         /* Convert frame.channel_position to our own channel values */
 295         for( i = 0; i < frame.channels; i++ )
 296         {
 297             /* Find the channel code */
 298             for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
 299             {
 300                 if( frame.channel_position[i] == pi_channels_in[j] )
 301                 {
 302                     p_sys->pi_channel_positions[i] = pi_channels_out[j];
 303                     p_dec->fmt_out.audio.i_physical_channels |=
 304                         pi_channels_out[j];
 305                     break;
 306                 }
 307             }
 308         }
 309         p_dec->fmt_out.audio.i_original_channels =
 310             p_dec->fmt_out.audio.i_physical_channels;
 311
 312         p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
 313         if( p_out == NULL )
 314         {
 315             p_sys->i_buffer = 0;
 316             block_Release( p_block );
 317             return NULL;
 318         }
 319
 320         p_out->start_date = aout_DateGet( &p_sys->date );
 321         p_out->end_date = aout_DateIncrement( &p_sys->date,
 322                                               frame.samples / frame.channels );
 323
 324         DoReordering( p_dec, (uint32_t *)p_out->p_buffer, samples,
 325                       frame.samples / frame.channels, frame.channels,
 326                       p_sys->pi_channel_positions );
 327
 328         p_sys->i_buffer -= frame.bytesconsumed;
 329         if( p_sys->i_buffer > 0 )
 330         {
 331             memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
 332                      p_sys->i_buffer );
 333         }
 334
 335         return p_out;
 336     }
 337
 338     block_Release( p_block );
 339     return NULL;
 340 }
 341
 342 /*****************************************************************************
 343  * Close:
 344  *****************************************************************************/
 345 static void Close( vlc_object_t *p_this )
 346 {
 347     decoder_t *p_dec = (decoder_t *)p_this;
 348     decoder_sys_t *p_sys = p_dec->p_sys;
 349
 350     faacDecClose( p_sys->hfaad );
 351     free( p_sys );
 352 }
 353
 354 /*****************************************************************************
 355  * DoReordering: do some channel re-ordering (the ac3 channel order is
 356  *   different from the aac one).
 357  *****************************************************************************/
 358 static void DoReordering( decoder_t *p_dec,
 359                           uint32_t *p_out, uint32_t *p_in, int i_samples,
 360                           int i_nb_channels, uint32_t *pi_chan_positions )
 361 {
 362     int pi_chan_table[MAX_CHANNEL_POSITIONS];
 363     int i, j, k;
 364
 365     /* Find the channels mapping */
 366     for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
 367     {
 368         for( k = 0; k < i_nb_channels; k++ )
 369         {
 370             if( pi_channels_ordered[i] == pi_chan_positions[k] )
 371             {
 372                 pi_chan_table[k] = j++;
 373                 break;
 374             }
 375         }
 376     }
 377
 378     /* Do the actual reordering */
 379     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_FPU )
 380         for( i = 0; i < i_samples; i++ )
 381             for( j = 0; j < i_nb_channels; j++ )
 382                 p_out[i * i_nb_channels + pi_chan_table[j]] =
 383                     p_in[i * i_nb_channels + j];
 384     else
 385         for( i = 0; i < i_samples; i++ )
 386             for( j = 0; j < i_nb_channels; j++ )
 387                 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
 388                     ((uint16_t *)p_in)[i * i_nb_channels + j];
 389 }