git.sesse.net Git - vlc/blob - modules/demux/flac.c

   1 /*****************************************************************************
   2  * flac.c : FLAC demux module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *          Laurent Aimar <fenrir@via.ecp.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_demux.h>
  35 #include <vlc_meta.h>                 /* vlc_meta_* */
  36 #include <vlc_input.h>                /* vlc_input_attachment, vlc_seekpoint */
  37 #include <vlc_codec.h>                /* decoder_t */
  38 #include <vlc_charset.h>              /* EnsureUTF8 */
  39
  40 #include <assert.h>
  41 #include "vorbis.h"                   /* vorbis comments */
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46 static int  Open  ( vlc_object_t * );
  47 static void Close ( vlc_object_t * );
  48
  49 vlc_module_begin ()
  50     set_description( N_("FLAC demuxer") )
  51     set_capability( "demux", 155 )
  52     set_category( CAT_INPUT )
  53     set_subcategory( SUBCAT_INPUT_DEMUX )
  54     set_callbacks( Open, Close )
  55     add_shortcut( "flac" )
  56 vlc_module_end ()
  57
  58 /*****************************************************************************
  59  * Local prototypes
  60  *****************************************************************************/
  61 static int Demux  ( demux_t * );
  62 static int Control( demux_t *, int, va_list );
  63
  64 static int  ReadMeta( demux_t *, uint8_t **pp_streaminfo, int *pi_streaminfo );
  65
  66 struct demux_sys_t
  67 {
  68     bool  b_start;
  69     es_out_id_t *p_es;
  70
  71     /* Packetizer */
  72     decoder_t *p_packetizer;
  73
  74     vlc_meta_t *p_meta;
  75     audio_replay_gain_t replay_gain;
  76
  77     int64_t i_time_offset;
  78     int64_t i_pts;
  79     int64_t i_pts_start;
  80
  81     int64_t i_length; /* Length from stream info */
  82     int64_t i_data_pos;
  83
  84     /* */
  85     int         i_seekpoint;
  86     seekpoint_t **seekpoint;
  87
  88     /* */
  89     int                i_attachments;
  90     input_attachment_t **attachments;
  91     int                i_cover_idx;
  92     int                i_cover_score;
  93 };
  94
  95 #define STREAMINFO_SIZE 38
  96 #define FLAC_PACKET_SIZE 16384
  97
  98 /*****************************************************************************
  99  * Open: initializes ES structures
 100  *****************************************************************************/
 101 static int Open( vlc_object_t * p_this )
 102 {
 103     demux_t     *p_demux = (demux_t*)p_this;
 104     demux_sys_t *p_sys;
 105     const uint8_t *p_peek;
 106     uint8_t     *p_streaminfo;
 107     int         i_streaminfo;
 108     es_format_t fmt;
 109
 110     /* Have a peep at the show. */
 111     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
 112
 113     if( p_peek[0]!='f' || p_peek[1]!='L' || p_peek[2]!='a' || p_peek[3]!='C' )
 114     {
 115         if( !p_demux->b_force ) return VLC_EGENERIC;
 116
 117         /* User forced */
 118         msg_Err( p_demux, "this doesn't look like a flac stream, "
 119                  "continuing anyway" );
 120     }
 121
 122     p_sys = malloc( sizeof( demux_sys_t ) );
 123     if( unlikely(p_sys == NULL) )
 124         return VLC_ENOMEM;
 125
 126     p_demux->pf_demux   = Demux;
 127     p_demux->pf_control = Control;
 128     p_demux->p_sys      = p_sys;
 129     p_sys->b_start = true;
 130     p_sys->p_meta = NULL;
 131     memset( &p_sys->replay_gain, 0, sizeof(p_sys->replay_gain) );
 132     p_sys->i_length = 0;
 133     p_sys->i_time_offset = 0;
 134     p_sys->i_pts = 0;
 135     p_sys->i_pts_start = 0;
 136     p_sys->p_es = NULL;
 137     TAB_INIT( p_sys->i_seekpoint, p_sys->seekpoint );
 138     TAB_INIT( p_sys->i_attachments, p_sys->attachments);
 139     p_sys->i_cover_idx = 0;
 140     p_sys->i_cover_score = 0;
 141
 142     /* We need to read and store the STREAMINFO metadata */
 143     if( ReadMeta( p_demux, &p_streaminfo, &i_streaminfo ) )
 144     {
 145         free( p_sys );
 146         return VLC_EGENERIC;
 147     }
 148
 149     /* Load the FLAC packetizer */
 150     /* Store STREAMINFO for the decoder and packetizer */
 151     p_streaminfo[4] |= 0x80; /* Fake this as the last metadata block */
 152     es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_FLAC );
 153     fmt.i_extra = i_streaminfo;
 154     fmt.p_extra = p_streaminfo;
 155
 156     p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, "flac" );
 157     if( !p_sys->p_packetizer )
 158     {
 159         free( p_sys );
 160         return VLC_EGENERIC;
 161     }
 162
 163     if( p_sys->i_cover_idx < p_sys->i_attachments )
 164     {
 165         char psz_url[128];
 166         if( !p_sys->p_meta )
 167             p_sys->p_meta = vlc_meta_New();
 168         snprintf( psz_url, sizeof(psz_url), "attachment://%s",
 169                   p_sys->attachments[p_sys->i_cover_idx]->psz_name );
 170         vlc_meta_Set( p_sys->p_meta, vlc_meta_ArtworkURL, psz_url );
 171     }
 172     vlc_audio_replay_gain_MergeFromMeta( &p_sys->replay_gain, p_sys->p_meta );
 173     return VLC_SUCCESS;
 174 }
 175
 176 /*****************************************************************************
 177  * Close: frees unused data
 178  *****************************************************************************/
 179 static void Close( vlc_object_t * p_this )
 180 {
 181     demux_t     *p_demux = (demux_t*)p_this;
 182     demux_sys_t *p_sys = p_demux->p_sys;
 183
 184     TAB_CLEAN( p_sys->i_seekpoint, p_sys->seekpoint );
 185
 186     int i;
 187     for( i = 0; i < p_sys->i_attachments; i++ )
 188         free( p_sys->attachments[i] );
 189     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 190
 191     /* Delete the decoder */
 192     demux_PacketizerDestroy( p_sys->p_packetizer );
 193
 194     if( p_sys->p_meta )
 195         vlc_meta_Delete( p_sys->p_meta );
 196     free( p_sys );
 197 }
 198
 199 /*****************************************************************************
 200  * Demux: reads and demuxes data packets
 201  *****************************************************************************
 202  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 203  *****************************************************************************/
 204 static int Demux( demux_t *p_demux )
 205 {
 206     demux_sys_t *p_sys = p_demux->p_sys;
 207     block_t     *p_block_in, *p_block_out;
 208
 209     if( !( p_block_in = stream_Block( p_demux->s, FLAC_PACKET_SIZE ) ) )
 210         return 0;
 211
 212     p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start ? VLC_TS_0 : VLC_TS_INVALID;
 213     p_sys->b_start = false;
 214
 215     while( (p_block_out = p_sys->p_packetizer->pf_packetize(
 216                 p_sys->p_packetizer, &p_block_in )) )
 217     {
 218         while( p_block_out )
 219         {
 220             block_t *p_next = p_block_out->p_next;
 221
 222             p_block_out->p_next = NULL;
 223
 224             if( p_sys->p_es == NULL )
 225             {
 226                 p_sys->p_packetizer->fmt_out.b_packetized = true;
 227                 p_sys->p_packetizer->fmt_out.audio_replay_gain = p_sys->replay_gain;
 228                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
 229             }
 230
 231             p_sys->i_pts = p_block_out->i_dts - VLC_TS_0;
 232
 233             /* Correct timestamp */
 234             p_block_out->i_pts += p_sys->i_time_offset;
 235             p_block_out->i_dts += p_sys->i_time_offset;
 236
 237             /* set PCR */
 238             es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
 239
 240             es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
 241
 242             p_block_out = p_next;
 243         }
 244     }
 245     return 1;
 246 }
 247
 248 /*****************************************************************************
 249  * Control:
 250  *****************************************************************************/
 251 static int64_t ControlGetLength( demux_t *p_demux )
 252 {
 253     demux_sys_t *p_sys = p_demux->p_sys;
 254     const int64_t i_size = stream_Size(p_demux->s) - p_sys->i_data_pos;
 255     int64_t i_length = p_sys->i_length;
 256     int i;
 257
 258     /* Try to fix length using seekpoint and current size for truncated file */
 259     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 260     {
 261         seekpoint_t *s = p_sys->seekpoint[i];
 262         if( s->i_byte_offset <= i_size )
 263         {
 264             if( i+1 < p_sys->i_seekpoint )
 265             {
 266                 /* Broken file */
 267                 seekpoint_t *n = p_sys->seekpoint[i+1];
 268                 assert( n->i_byte_offset != s->i_byte_offset); /* Should be ensured by ParseSeekTable */
 269                 i_length = s->i_time_offset + (n->i_time_offset-s->i_time_offset) * (i_size-s->i_byte_offset) / (n->i_byte_offset-s->i_byte_offset);
 270             }
 271             break;
 272         }
 273     }
 274     return i_length;
 275 }
 276
 277 static int64_t ControlGetTime( demux_t *p_demux )
 278 {
 279     demux_sys_t *p_sys = p_demux->p_sys;
 280     return __MAX(p_sys->i_pts, p_sys->i_pts_start) + p_sys->i_time_offset;
 281 }
 282
 283 static int ControlSetTime( demux_t *p_demux, int64_t i_time )
 284 {
 285     demux_sys_t *p_sys = p_demux->p_sys;
 286     int64_t i_delta_time;
 287     bool b_seekable;
 288     int i;
 289
 290     /* */
 291     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
 292     if( !b_seekable )
 293         return VLC_EGENERIC;
 294
 295     /* */
 296     assert( p_sys->i_seekpoint > 0 );   /* ReadMeta ensure at least (0,0) */
 297     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 298     {
 299         if( p_sys->seekpoint[i]->i_time_offset <= i_time )
 300             break;
 301     }
 302     i_delta_time = i_time - p_sys->seekpoint[i]->i_time_offset;
 303
 304     /* XXX We do exact seek if it's not too far away(45s) */
 305     if( i_delta_time < 45*INT64_C(1000000) )
 306     {
 307         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos ) )
 308             return VLC_EGENERIC;
 309
 310         p_sys->i_time_offset = p_sys->seekpoint[i]->i_time_offset - p_sys->i_pts;
 311         p_sys->i_pts_start = p_sys->i_pts+i_delta_time;
 312         es_out_Control( p_demux->out, ES_OUT_SET_NEXT_DISPLAY_TIME, p_sys->i_pts_start + p_sys->i_time_offset );
 313     }
 314     else
 315     {
 316         int64_t i_delta_offset;
 317         int64_t i_next_time;
 318         int64_t i_next_offset;
 319
 320         if( i+1 < p_sys->i_seekpoint )
 321         {
 322             i_next_time   = p_sys->seekpoint[i+1]->i_time_offset;
 323             i_next_offset = p_sys->seekpoint[i+1]->i_byte_offset;
 324         }
 325         else
 326         {
 327             i_next_time   = p_sys->i_length;
 328             i_next_offset = stream_Size(p_demux->s)-p_sys->i_data_pos;
 329         }
 330
 331         i_delta_offset = 0;
 332         if( i_next_time-p_sys->seekpoint[i]->i_time_offset > 0 )
 333             i_delta_offset = (i_next_offset - p_sys->seekpoint[i]->i_byte_offset) * i_delta_time /
 334                              (i_next_time-p_sys->seekpoint[i]->i_time_offset);
 335
 336         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos + i_delta_offset ) )
 337             return VLC_EGENERIC;
 338
 339         p_sys->i_pts_start = p_sys->i_pts;
 340         p_sys->i_time_offset = (p_sys->seekpoint[i]->i_time_offset+i_delta_time) - p_sys->i_pts;
 341     }
 342     return VLC_SUCCESS;
 343 }
 344
 345 static int Control( demux_t *p_demux, int i_query, va_list args )
 346 {
 347     demux_sys_t *p_sys = p_demux->p_sys;
 348
 349     if( i_query == DEMUX_GET_META )
 350     {
 351         vlc_meta_t *p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t* );
 352         if( p_demux->p_sys->p_meta )
 353             vlc_meta_Merge( p_meta, p_demux->p_sys->p_meta );
 354         return VLC_SUCCESS;
 355     }
 356     else if( i_query == DEMUX_HAS_UNSUPPORTED_META )
 357     {
 358         bool *pb_bool = (bool*)va_arg( args, bool* );
 359         *pb_bool = true;
 360         return VLC_SUCCESS;
 361     }
 362     else if( i_query == DEMUX_GET_LENGTH )
 363     {
 364         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 365         *pi64 = ControlGetLength( p_demux );
 366         return VLC_SUCCESS;
 367     }
 368     else if( i_query == DEMUX_SET_TIME )
 369     {
 370         int64_t i_time = (int64_t)va_arg( args, int64_t );
 371         return ControlSetTime( p_demux, i_time );
 372     }
 373     else if( i_query == DEMUX_SET_POSITION )
 374     {
 375         const double f = (double)va_arg( args, double );
 376         int64_t i_time = f * ControlGetLength( p_demux );
 377         return ControlSetTime( p_demux, i_time );
 378     }
 379     else if( i_query == DEMUX_GET_TIME )
 380     {
 381         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 382         *pi64 = ControlGetTime( p_demux );
 383         return VLC_SUCCESS;
 384     }
 385     else if( i_query == DEMUX_GET_POSITION )
 386     {
 387         double *pf = (double*)va_arg( args, double * );
 388         const int64_t i_length = ControlGetLength(p_demux);
 389         if( i_length > 0 )
 390         {
 391             double current = ControlGetTime(p_demux);
 392             *pf = current / (double)i_length;
 393         }
 394         else
 395             *pf= 0.0;
 396         return VLC_SUCCESS;
 397     }
 398     else if( i_query == DEMUX_GET_ATTACHMENTS )
 399     {
 400         input_attachment_t ***ppp_attach =
 401             (input_attachment_t***)va_arg( args, input_attachment_t*** );
 402         int *pi_int = (int*)va_arg( args, int * );
 403
 404         if( p_sys->i_attachments <= 0 )
 405             return VLC_EGENERIC;
 406
 407         *pi_int = p_sys->i_attachments;
 408         *ppp_attach = xmalloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
 409         for( int i = 0; i < p_sys->i_attachments; i++ )
 410             (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
 411         return VLC_SUCCESS;
 412     }
 413
 414     return demux_vaControlHelper( p_demux->s, p_sys->i_data_pos, -1,
 415                                    8*0, 1, i_query, args );
 416 }
 417
 418 enum
 419 {
 420     META_STREAMINFO = 0,
 421     META_SEEKTABLE = 3,
 422     META_COMMENT = 4,
 423     META_PICTURE = 6,
 424 };
 425
 426 static inline int Get24bBE( const uint8_t *p )
 427 {
 428     return (p[0] << 16)|(p[1] << 8)|(p[2]);
 429 }
 430
 431 static void ParseStreamInfo( int *pi_rate, int64_t *pi_count, uint8_t *p_data );
 432 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 433                             int i_sample_rate );
 434 static void ParseComment( demux_t *, const uint8_t *p_data, int i_data );
 435 static void ParsePicture( demux_t *, const uint8_t *p_data, int i_data );
 436
 437 static int  ReadMeta( demux_t *p_demux, uint8_t **pp_streaminfo, int *pi_streaminfo )
 438 {
 439     demux_sys_t *p_sys = p_demux->p_sys;
 440     int     i_peek;
 441     const uint8_t *p_peek;
 442     bool b_last;
 443     int i_sample_rate;
 444     int64_t i_sample_count;
 445     seekpoint_t *s;
 446
 447     /* Read STREAMINFO */
 448     i_peek = stream_Peek( p_demux->s, &p_peek, 8 );
 449     if( (p_peek[4] & 0x7F) != META_STREAMINFO )
 450     {
 451         msg_Err( p_demux, "this isn't a STREAMINFO metadata block" );
 452         return VLC_EGENERIC;
 453     }
 454     if( Get24bBE(&p_peek[5]) != (STREAMINFO_SIZE - 4) )
 455     {
 456         msg_Err( p_demux, "invalid size for a STREAMINFO metadata block" );
 457         return VLC_EGENERIC;
 458     }
 459
 460     *pi_streaminfo = 4 + STREAMINFO_SIZE;
 461     *pp_streaminfo = malloc( 4 + STREAMINFO_SIZE );
 462     if( *pp_streaminfo == NULL )
 463         return VLC_EGENERIC;
 464
 465     if( stream_Read( p_demux->s, *pp_streaminfo, 4+STREAMINFO_SIZE ) != 4+STREAMINFO_SIZE )
 466     {
 467         msg_Err( p_demux, "failed to read STREAMINFO metadata block" );
 468         free( *pp_streaminfo );
 469         return VLC_EGENERIC;
 470     }
 471
 472     /* */
 473     ParseStreamInfo( &i_sample_rate, &i_sample_count, *pp_streaminfo );
 474     if( i_sample_rate > 0 )
 475         p_sys->i_length = i_sample_count * INT64_C(1000000)/i_sample_rate;
 476
 477     /* Be sure we have seekpoint 0 */
 478     s = vlc_seekpoint_New();
 479     s->i_time_offset = 0;
 480     s->i_byte_offset = 0;
 481     TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 482
 483     b_last = (*pp_streaminfo)[4]&0x80;
 484     while( !b_last )
 485     {
 486         int i_len;
 487         int i_type;
 488
 489         i_peek = stream_Peek( p_demux->s, &p_peek, 4 );
 490         if( i_peek < 4 )
 491             break;
 492         b_last = p_peek[0]&0x80;
 493         i_type = p_peek[0]&0x7f;
 494         i_len  = Get24bBE( &p_peek[1] );
 495
 496         if( i_type == META_SEEKTABLE )
 497         {
 498             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 499             if( i_peek == 4+i_len )
 500                 ParseSeekTable( p_demux, p_peek, i_peek, i_sample_rate );
 501         }
 502         else if( i_type == META_COMMENT )
 503         {
 504             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 505             if( i_peek == 4+i_len )
 506                 ParseComment( p_demux, p_peek, i_peek );
 507         }
 508         else if( i_type == META_PICTURE )
 509         {
 510             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 511             if( i_peek == 4+i_len )
 512                 ParsePicture( p_demux, p_peek, i_peek );
 513         }
 514
 515         if( stream_Read( p_demux->s, NULL, 4+i_len ) < 4+i_len )
 516             break;
 517     }
 518
 519     /* */
 520     p_sys->i_data_pos = stream_Tell( p_demux->s );
 521
 522     return VLC_SUCCESS;
 523 }
 524 static void ParseStreamInfo( int *pi_rate, int64_t *pi_count, uint8_t *p_data )
 525 {
 526     const int i_skip = 4+4;
 527
 528     *pi_rate = GetDWBE(&p_data[i_skip+4+6]) >> 12;
 529     *pi_count = GetQWBE(&p_data[i_skip+4+6]) &  ((INT64_C(1)<<36)-1);
 530 }
 531
 532 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 533                             int i_sample_rate )
 534 {
 535     demux_sys_t *p_sys = p_demux->p_sys;
 536     seekpoint_t *s;
 537     int i;
 538
 539     if( i_sample_rate <= 0 )
 540         return;
 541
 542     /* */
 543     for( i = 0; i < (i_data-4)/18; i++ )
 544     {
 545         const int64_t i_sample = GetQWBE( &p_data[4+18*i+0] );
 546         int j;
 547
 548         if( i_sample < 0 || i_sample >= INT64_MAX )
 549             continue;
 550
 551         s = vlc_seekpoint_New();
 552         s->i_time_offset = i_sample * INT64_C(1000000)/i_sample_rate;
 553         s->i_byte_offset = GetQWBE( &p_data[4+18*i+8] );
 554
 555         /* Check for duplicate entry */
 556         for( j = 0; j < p_sys->i_seekpoint; j++ )
 557         {
 558             if( p_sys->seekpoint[j]->i_time_offset == s->i_time_offset ||
 559                 p_sys->seekpoint[j]->i_byte_offset == s->i_byte_offset )
 560             {
 561                 vlc_seekpoint_Delete( s );
 562                 s = NULL;
 563                 break;
 564             }
 565         }
 566         if( s )
 567         {
 568             TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 569         }
 570     }
 571     /* TODO sort it by size and remove wrong seek entry (time not increasing) */
 572 }
 573
 574 static void ParseComment( demux_t *p_demux, const uint8_t *p_data, int i_data )
 575 {
 576     demux_sys_t *p_sys = p_demux->p_sys;
 577
 578     if( i_data < 4 )
 579         return;
 580
 581     vorbis_ParseComment( &p_sys->p_meta, &p_data[4], i_data - 4, NULL, NULL, NULL, NULL );
 582
 583 }
 584
 585 static void ParsePicture( demux_t *p_demux, const uint8_t *p_data, int i_data )
 586 {
 587     static const int pi_cover_score[] = {
 588         0,      /* other */
 589         2, 1,   /* icons */
 590         10,     /* front cover */
 591         9,      /* back cover */
 592         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 593         6,      /* movie/video screen capture */
 594         0,
 595         7,      /* Illustration */
 596         8,      /* Band/Artist logotype */
 597         0,      /* Publisher/Studio */
 598     };
 599     demux_sys_t *p_sys = p_demux->p_sys;
 600     int i_type;
 601
 602     i_data -= 4; p_data += 4;
 603
 604     input_attachment_t *p_attachment = ParseFlacPicture( p_data, i_data, p_sys->i_attachments, &i_type );
 605     if( p_attachment == NULL )
 606         return;
 607
 608     TAB_APPEND( p_sys->i_attachments, p_sys->attachments, p_attachment );
 609
 610     if( i_type >= 0 && (unsigned int)i_type < sizeof(pi_cover_score)/sizeof(pi_cover_score[0]) &&
 611         p_sys->i_cover_score < pi_cover_score[i_type] )
 612     {
 613         p_sys->i_cover_idx = p_sys->i_attachments-1;
 614         p_sys->i_cover_score = pi_cover_score[i_type];
 615     }
 616 }
 617