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

   1 /*****************************************************************************
   2  * flac.c : FLAC demux module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2007 the VideoLAN team
   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
  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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <vlc/vlc.h>
  29 #include <vlc_demux.h>
  30 #include <vlc_meta.h>
  31 #include <vlc_input.h>
  32 #include <vlc_codec.h>
  33 #include <assert.h>
  34 #include <vlc_charset.h>
  35
  36 /*****************************************************************************
  37  * Module descriptor
  38  *****************************************************************************/
  39 static int  Open  ( vlc_object_t * );
  40 static void Close ( vlc_object_t * );
  41
  42 vlc_module_begin();
  43     set_description( _("FLAC demuxer") );
  44     set_capability( "demux2", 155 );
  45     set_category( CAT_INPUT );
  46     set_subcategory( SUBCAT_INPUT_DEMUX );
  47     set_callbacks( Open, Close );
  48     add_shortcut( "flac" );
  49 vlc_module_end();
  50
  51 /*****************************************************************************
  52  * Local prototypes
  53  *****************************************************************************/
  54 static int Demux  ( demux_t * );
  55 static int Control( demux_t *, int, va_list );
  56
  57 static int  ReadMeta( demux_t *, uint8_t **pp_streaminfo, int *pi_streaminfo );
  58
  59 struct demux_sys_t
  60 {
  61     vlc_bool_t  b_start;
  62     es_out_id_t *p_es;
  63
  64     /* Packetizer */
  65     decoder_t *p_packetizer;
  66     vlc_meta_t *p_meta;
  67     audio_replay_gain_t replay_gain;
  68
  69     int64_t i_time_offset;
  70     int64_t i_pts;
  71     int64_t i_pts_start;
  72
  73     int64_t i_length; /* Length from stream info */
  74     int64_t i_data_pos;
  75
  76     /* */
  77     int         i_seekpoint;
  78     seekpoint_t **seekpoint;
  79
  80     /* */
  81     int                i_attachments;
  82     input_attachment_t **attachments;
  83     int                i_cover_idx;
  84     int                i_cover_score;
  85 };
  86
  87 #define STREAMINFO_SIZE 38
  88 #define FLAC_PACKET_SIZE 16384
  89
  90 /*****************************************************************************
  91  * Open: initializes ES structures
  92  *****************************************************************************/
  93 static int Open( vlc_object_t * p_this )
  94 {
  95     demux_t     *p_demux = (demux_t*)p_this;
  96     module_t    *p_id3;
  97     demux_sys_t *p_sys;
  98     const byte_t *p_peek;
  99     uint8_t     *p_streaminfo;
 100     int         i_streaminfo;
 101
 102     /* Have a peep at the show. */
 103     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
 104
 105     if( p_peek[0]!='f' || p_peek[1]!='L' || p_peek[2]!='a' || p_peek[3]!='C' )
 106     {
 107         if( !p_demux->b_force ) return VLC_EGENERIC;
 108
 109         /* User forced */
 110         msg_Err( p_demux, "this doesn't look like a flac stream, "
 111                  "continuing anyway" );
 112     }
 113
 114     p_demux->pf_demux   = Demux;
 115     p_demux->pf_control = Control;
 116     p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );
 117     p_sys->b_start = VLC_TRUE;
 118     p_sys->p_meta = NULL;
 119     memset( &p_sys->replay_gain, 0, sizeof(p_sys->replay_gain) );
 120     p_sys->i_length = 0;
 121     p_sys->i_time_offset = 0;
 122     p_sys->i_pts = 0;
 123     p_sys->i_pts_start = 0;
 124     p_sys->p_es = NULL;
 125     TAB_INIT( p_sys->i_seekpoint, p_sys->seekpoint );
 126     TAB_INIT( p_sys->i_attachments, p_sys->attachments);
 127     p_sys->i_cover_idx = 0;
 128     p_sys->i_cover_score = 0;
 129
 130     /* We need to read and store the STREAMINFO metadata */
 131     if( ReadMeta( p_demux, &p_streaminfo, &i_streaminfo ) )
 132     {
 133         free( p_sys );
 134         return VLC_EGENERIC;
 135     }
 136
 137     /* Load the FLAC packetizer */
 138     INIT_APACKETIZER( p_sys->p_packetizer, 'f', 'l', 'a', 'c' );
 139
 140     /* Store STREAMINFO for the decoder and packetizer */
 141     p_streaminfo[4] |= 0x80; /* Fake this as the last metadata block */
 142     p_sys->p_packetizer->fmt_in.i_extra = i_streaminfo;
 143     p_sys->p_packetizer->fmt_in.p_extra = p_streaminfo;
 144
 145     p_sys->p_packetizer->p_module =
 146         module_Need( p_sys->p_packetizer, "packetizer", NULL, 0 );
 147     if( !p_sys->p_packetizer->p_module )
 148     {
 149         if( p_sys->p_packetizer->fmt_in.p_extra )
 150             free( p_sys->p_packetizer->fmt_in.p_extra );
 151         vlc_object_destroy( p_sys->p_packetizer );
 152
 153         msg_Err( p_demux, "cannot find flac packetizer" );
 154         return VLC_EGENERIC;
 155     }
 156
 157     /* Parse possible id3 header */
 158     input_thread_t *p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT, FIND_PARENT );
 159     if( p_input )
 160     {
 161         if( !( input_GetItem( p_input )->p_meta->i_status & ITEM_PREPARSED ) )
 162         {
 163             p_demux->p_private = malloc( sizeof( demux_meta_t ) );
 164             if( !p_demux->p_private )
 165             {
 166                 vlc_object_release( p_input );
 167                 return VLC_ENOMEM;
 168             }
 169             if( ( p_id3 = module_Need( p_demux, "meta reader", NULL, 0 ) ) )
 170             {
 171                 demux_meta_t *p_demux_meta = (demux_meta_t *)p_demux->p_private;
 172                 vlc_meta_t *p_meta = p_demux_meta->p_meta;
 173
 174                 if( !p_sys->p_meta )
 175                 {
 176                     p_sys->p_meta = p_meta;
 177                 }
 178                 else if( p_meta )
 179                 {
 180                     vlc_meta_Merge( p_sys->p_meta, p_meta );
 181                     vlc_meta_Delete( p_meta );
 182                 }
 183                 p_demux->p_private = NULL;
 184                 module_Unneed( p_demux, p_id3 );
 185                 int i;
 186                 for( i = 0; i < p_demux_meta->i_attachments; i++ )
 187                     TAB_APPEND_CAST( (input_attachment_t**),
 188                             p_sys->i_attachments, p_sys->attachments,
 189                             p_demux_meta->attachments[p_demux_meta->i_attachments] );
 190                 TAB_CLEAN( p_demux_meta->i_attachments,
 191                             p_demux_meta->attachments );
 192             }
 193             free( p_demux->p_private );
 194         }
 195         vlc_object_release( p_input );
 196     }
 197
 198     if( p_sys->i_cover_idx < p_sys->i_attachments )
 199     {
 200         char psz_url[128];
 201         if( !p_sys->p_meta )
 202             p_sys->p_meta = vlc_meta_New();
 203         snprintf( psz_url, sizeof(psz_url), "attachment://%s",
 204                   p_sys->attachments[p_sys->i_cover_idx]->psz_name );
 205         vlc_meta_Set( p_sys->p_meta, vlc_meta_ArtworkURL, psz_url );
 206     }
 207     vlc_audio_replay_gain_MergeFromMeta( &p_sys->replay_gain, p_sys->p_meta );
 208     return VLC_SUCCESS;
 209 }
 210
 211 /*****************************************************************************
 212  * Close: frees unused data
 213  *****************************************************************************/
 214 static void Close( vlc_object_t * p_this )
 215 {
 216     demux_t     *p_demux = (demux_t*)p_this;
 217     demux_sys_t *p_sys = p_demux->p_sys;
 218
 219     TAB_CLEAN( p_sys->i_seekpoint, p_sys->seekpoint );
 220
 221     int i;
 222     for( i = 0; i < p_sys->i_attachments; i++ )
 223         free( p_sys->attachments[i] );
 224     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 225
 226     /* Unneed module */
 227     module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
 228
 229     if( p_sys->p_packetizer->fmt_in.p_extra )
 230         free( p_sys->p_packetizer->fmt_in.p_extra );
 231
 232     /* Delete the decoder */
 233     vlc_object_destroy( p_sys->p_packetizer );
 234     if( p_sys->p_meta )
 235         vlc_meta_Delete( p_sys->p_meta );
 236     free( p_sys );
 237 }
 238
 239 /*****************************************************************************
 240  * Demux: reads and demuxes data packets
 241  *****************************************************************************
 242  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 243  *****************************************************************************/
 244 static int Demux( demux_t *p_demux )
 245 {
 246     demux_sys_t *p_sys = p_demux->p_sys;
 247     block_t     *p_block_in, *p_block_out;
 248
 249     if( !( p_block_in = stream_Block( p_demux->s, FLAC_PACKET_SIZE ) ) )
 250         return 0;
 251
 252     p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start ? 1 : 0;
 253     p_sys->b_start = VLC_FALSE;
 254
 255     while( (p_block_out = p_sys->p_packetizer->pf_packetize(
 256                 p_sys->p_packetizer, &p_block_in )) )
 257     {
 258         while( p_block_out )
 259         {
 260             block_t *p_next = p_block_out->p_next;
 261
 262             p_block_out->p_next = NULL;
 263
 264             if( p_sys->p_es == NULL )
 265             {
 266                 p_sys->p_packetizer->fmt_out.b_packetized = VLC_TRUE;
 267                 p_sys->p_packetizer->fmt_out.audio_replay_gain = p_sys->replay_gain;
 268                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
 269             }
 270
 271             /* set PCR */
 272             if( p_block_out->i_dts >= p_sys->i_pts_start )
 273                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
 274             else
 275                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 276
 277             p_sys->i_pts = p_block_out->i_dts;
 278             es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
 279
 280             p_block_out = p_next;
 281         }
 282     }
 283     return 1;
 284 }
 285
 286 /*****************************************************************************
 287  * Control:
 288  *****************************************************************************/
 289 static int64_t ControlGetLength( demux_t *p_demux )
 290 {
 291     demux_sys_t *p_sys = p_demux->p_sys;
 292     const int64_t i_size = stream_Size(p_demux->s) - p_sys->i_data_pos;
 293     int64_t i_length = p_sys->i_length;
 294     int i;
 295
 296     /* Try to fix length using seekpoint and current size for truncated file */
 297     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 298     {
 299         seekpoint_t *s = p_sys->seekpoint[i];
 300         if( s->i_byte_offset <= i_size )
 301         {
 302             if( i+1 < p_sys->i_seekpoint )
 303             {
 304                 /* Broken file */
 305                 seekpoint_t *n = p_sys->seekpoint[i+1];
 306                 assert( n->i_byte_offset != s->i_byte_offset); /* Should be ensured by ParseSeekTable */
 307                 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);
 308             }
 309             break;
 310         }
 311     }
 312     return i_length;
 313 }
 314
 315 static int64_t ControlGetTime( demux_t *p_demux )
 316 {
 317     demux_sys_t *p_sys = p_demux->p_sys;
 318     return __MAX(p_sys->i_pts, p_sys->i_pts_start) + p_sys->i_time_offset;
 319 }
 320
 321 static int ControlSetTime( demux_t *p_demux, int64_t i_time )
 322 {
 323     demux_sys_t *p_sys = p_demux->p_sys;
 324     int64_t i_next_time;
 325     int64_t i_next_offset;
 326     int64_t i_delta_time;
 327     int64_t i_delta_offset;
 328     vlc_bool_t b_seekable;
 329     int i;
 330
 331     /* */
 332     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
 333     if( !b_seekable )
 334         return VLC_EGENERIC;
 335
 336     /* */
 337     assert( p_sys->i_seekpoint > 0 );   /* ReadMeta ensure at least (0,0) */
 338     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 339     {
 340         if( p_sys->seekpoint[i]->i_time_offset <= i_time )
 341             break;
 342     }
 343     if( i+1 < p_sys->i_seekpoint )
 344     {
 345         i_next_time   = p_sys->seekpoint[i+1]->i_time_offset;
 346         i_next_offset = p_sys->seekpoint[i+1]->i_byte_offset;
 347     }
 348     else
 349     {
 350         i_next_time   = p_sys->i_length;
 351         i_next_offset = stream_Size(p_demux->s)-p_sys->i_data_pos;
 352     }
 353     i_delta_time = i_time - p_sys->seekpoint[i]->i_time_offset;
 354     i_delta_offset = (i_next_offset - p_sys->seekpoint[i]->i_byte_offset) * i_delta_time /
 355                             (p_sys->seekpoint[i+1]->i_time_offset-p_sys->seekpoint[i]->i_time_offset);
 356
 357     /* XXX We do exact seek if it's not too far away(45s) */
 358     if( i_delta_time < 45*I64C(1000000) )
 359     {
 360         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos ) )
 361             return VLC_EGENERIC;
 362         p_sys->i_time_offset = p_sys->seekpoint[i]->i_time_offset - p_sys->i_pts;
 363         p_sys->i_pts_start = p_sys->i_pts+i_delta_time;
 364         es_out_Control( p_demux->out, ES_OUT_SET_NEXT_DISPLAY_TIME, p_sys->p_es, p_sys->i_pts_start );
 365     }
 366     else
 367     {
 368         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos + i_delta_offset ) )
 369             return VLC_EGENERIC;
 370         p_sys->i_pts_start = p_sys->i_pts;
 371         p_sys->i_time_offset = (p_sys->seekpoint[i]->i_time_offset+i_delta_time) - p_sys->i_pts;
 372     }
 373     return VLC_SUCCESS;
 374 }
 375
 376 static int Control( demux_t *p_demux, int i_query, va_list args )
 377 {
 378     demux_sys_t *p_sys = p_demux->p_sys;
 379
 380     if( i_query == DEMUX_GET_META )
 381     {
 382         vlc_meta_t *p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t* );
 383         if( p_demux->p_sys->p_meta )
 384             vlc_meta_Merge( p_meta, p_demux->p_sys->p_meta );
 385         return VLC_SUCCESS;
 386     }
 387     else if( i_query == DEMUX_GET_LENGTH )
 388     {
 389         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 390         *pi64 = ControlGetLength( p_demux );
 391         return VLC_SUCCESS;
 392     }
 393     else if( i_query == DEMUX_SET_TIME )
 394     {
 395         int64_t i_time = (int64_t)va_arg( args, int64_t );
 396         return ControlSetTime( p_demux, i_time );
 397     }
 398     else if( i_query == DEMUX_SET_POSITION )
 399     {
 400         const double f = (double)va_arg( args, double );
 401         int64_t i_time = f * ControlGetLength( p_demux );
 402         return ControlSetTime( p_demux, i_time );
 403     }
 404     else if( i_query == DEMUX_GET_TIME )
 405     {
 406         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 407         *pi64 = ControlGetTime( p_demux );
 408         return VLC_SUCCESS;
 409     }
 410     else if( i_query == DEMUX_GET_POSITION )
 411     {
 412         double *pf = (double*)va_arg( args, double * );
 413         const int64_t i_length = ControlGetLength(p_demux);
 414         if( i_length > 0 )
 415             *pf = (double)ControlGetTime(p_demux) / (double)i_length;
 416         else
 417             *pf= 0.0;
 418         return VLC_SUCCESS;
 419     }
 420     else if( i_query == DEMUX_GET_ATTACHMENTS )
 421     {
 422         input_attachment_t ***ppp_attach =
 423             (input_attachment_t***)va_arg( args, input_attachment_t*** );
 424         int *pi_int = (int*)va_arg( args, int * );
 425         int i;
 426
 427         if( p_sys->i_attachments <= 0 )
 428             return VLC_EGENERIC;
 429
 430         *pi_int = p_sys->i_attachments;;
 431         *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
 432         for( i = 0; i < p_sys->i_attachments; i++ )
 433             (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
 434         return VLC_SUCCESS;
 435     }
 436
 437     return demux2_vaControlHelper( p_demux->s, p_sys->i_data_pos, -1,
 438                                    8*0, 1, i_query, args );
 439 }
 440
 441 enum
 442 {
 443     META_STREAMINFO = 0,
 444     META_SEEKTABLE = 3,
 445     META_COMMENT = 4,
 446     META_PICTURE = 6,
 447 };
 448
 449 static inline int Get24bBE( const uint8_t *p )
 450 {
 451     return (p[0] << 16)|(p[1] << 8)|(p[2]);
 452 }
 453
 454 static void ParseStreamInfo( demux_t *p_demux, int *pi_rate, int64_t *pi_count, uint8_t *p_data, int i_data );
 455 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 456                             int i_sample_rate );
 457 static void ParseComment( demux_t *, const uint8_t *p_data, int i_data );
 458 static void ParsePicture( demux_t *, const uint8_t *p_data, int i_data );
 459
 460 static int  ReadMeta( demux_t *p_demux, uint8_t **pp_streaminfo, int *pi_streaminfo )
 461 {
 462     demux_sys_t *p_sys = p_demux->p_sys;
 463     int     i_peek;
 464     const uint8_t *p_peek;
 465     vlc_bool_t b_last;
 466     int i_sample_rate;
 467     int64_t i_sample_count;
 468     seekpoint_t *s;
 469
 470     /* Read STREAMINFO */
 471     i_peek = stream_Peek( p_demux->s, &p_peek, 8 );
 472     if( (p_peek[4] & 0x7F) != META_STREAMINFO )
 473     {
 474         msg_Err( p_demux, "this isn't a STREAMINFO metadata block" );
 475         return VLC_EGENERIC;
 476     }
 477     if( Get24bBE(&p_peek[5]) != (STREAMINFO_SIZE - 4) )
 478     {
 479         msg_Err( p_demux, "invalid size for a STREAMINFO metadata block" );
 480         return VLC_EGENERIC;
 481     }
 482
 483     *pi_streaminfo = 4 + STREAMINFO_SIZE;
 484     *pp_streaminfo = malloc( 4 + STREAMINFO_SIZE );
 485     if( *pp_streaminfo == NULL )
 486         return VLC_EGENERIC;
 487
 488     if( stream_Read( p_demux->s, *pp_streaminfo, 4+STREAMINFO_SIZE ) != 4+STREAMINFO_SIZE )
 489     {
 490         msg_Err( p_demux, "failed to read STREAMINFO metadata block" );
 491         free( *pp_streaminfo );
 492         return VLC_EGENERIC;
 493     }
 494
 495     /* */
 496     ParseStreamInfo( p_demux, &i_sample_rate, &i_sample_count,  *pp_streaminfo, *pi_streaminfo );
 497     if( i_sample_rate > 0 )
 498         p_sys->i_length = i_sample_count * I64C(1000000)/i_sample_rate;
 499
 500     /* Be sure we have seekpoint 0 */
 501     s = vlc_seekpoint_New();
 502     s->i_time_offset = 0;
 503     s->i_byte_offset = 0;
 504     TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 505
 506     b_last = (*pp_streaminfo)[4]&0x80;
 507     while( !b_last )
 508     {
 509         int i_len;
 510         int i_type;
 511
 512         i_peek = stream_Peek( p_demux->s, &p_peek, 4 );
 513         if( i_peek < 4 )
 514             break;
 515         b_last = p_peek[0]&0x80;
 516         i_type = p_peek[0]&0x7f;
 517         i_len  = Get24bBE( &p_peek[1] );
 518
 519         if( i_type == META_SEEKTABLE )
 520         {
 521             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 522             if( i_peek == 4+i_len )
 523                 ParseSeekTable( p_demux, p_peek, i_peek, i_sample_rate );
 524         }
 525         else if( i_type == META_COMMENT )
 526         {
 527             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 528             if( i_peek == 4+i_len )
 529                 ParseComment( p_demux, p_peek, i_peek );
 530         }
 531         else if( i_type == META_PICTURE )
 532         {
 533             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 534             if( i_peek == 4+i_len )
 535                 ParsePicture( p_demux, p_peek, i_peek );
 536         }
 537
 538         if( stream_Read( p_demux->s, NULL, 4+i_len ) < 4+i_len )
 539             break;
 540     }
 541
 542     /* */
 543     p_sys->i_data_pos = stream_Tell( p_demux->s );
 544
 545     return VLC_SUCCESS;
 546 }
 547 static void ParseStreamInfo( demux_t *p_demux, int *pi_rate, int64_t *pi_count, uint8_t *p_data, int i_data )
 548 {
 549     const int i_skip = 4+4;
 550
 551     *pi_rate = GetDWBE(&p_data[i_skip+4+6]) >> 12;
 552     *pi_count = GetQWBE(&p_data[i_skip+4+6]) &  ((I64C(1)<<36)-1);
 553 }
 554
 555 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 556                             int i_sample_rate )
 557 {
 558     demux_sys_t *p_sys = p_demux->p_sys;
 559     seekpoint_t *s;
 560     int i;
 561
 562     if( i_sample_rate <= 0 )
 563         return;
 564
 565     /* */
 566     for( i = 0; i < (i_data-4)/18; i++ )
 567     {
 568         const int64_t i_sample = GetQWBE( &p_data[4+18*i+0] );
 569         int j;
 570
 571         if( i_sample < 0 || i_sample >= INT64_MAX )
 572             continue;
 573
 574         s = vlc_seekpoint_New();
 575         s->i_time_offset = i_sample * I64C(1000000)/i_sample_rate;
 576         s->i_byte_offset = GetQWBE( &p_data[4+18*i+8] );
 577
 578         /* Check for duplicate entry */
 579         for( j = 0; j < p_sys->i_seekpoint; j++ )
 580         {
 581             if( p_sys->seekpoint[j]->i_time_offset == s->i_time_offset ||
 582                 p_sys->seekpoint[j]->i_byte_offset == s->i_byte_offset )
 583             {
 584                 vlc_seekpoint_Delete( s );
 585                 s = NULL;
 586                 break;
 587             }
 588         }
 589         if( s )
 590         {
 591             TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 592         }
 593     }
 594     /* TODO sort it by size and remove wrong seek entry (time not increasing) */
 595 }
 596
 597 #define RM(x) do { i_data -= (x); p_data += (x); } while(0)
 598 static void ParseComment( demux_t *p_demux, const uint8_t *p_data, int i_data )
 599 {
 600     demux_sys_t *p_sys = p_demux->p_sys;
 601     int n;
 602     int i_comment;
 603
 604     if( i_data < 8 )
 605         return;
 606
 607     RM(4);
 608
 609     n = GetDWLE(p_data); RM(4);
 610     if( n < 0 || n > i_data )
 611         return;
 612 #if 0
 613     if( n > 0 )
 614     {
 615         /* TODO report vendor string ? */
 616         char *psz_vendor = psz_vendor = strndup( p_data, n );
 617         msg_Dbg( p_demux, "FLAC: COMMENT vendor length=%d vendor=%s\n", n, psz_vendor );
 618         free( psz_vendor );
 619     }
 620 #endif
 621     RM(n);
 622
 623     if( i_data < 4 )
 624         return;
 625
 626     i_comment = GetDWLE(p_data); RM(4);
 627     if( i_comment <= 0 )
 628         return;
 629
 630     p_sys->p_meta = vlc_meta_New();
 631
 632     for( ; i_comment > 0; i_comment-- )
 633     {
 634         char *psz;
 635         if( i_data < 4 )
 636             break;
 637         n = GetDWLE(p_data); RM(4);
 638         if( n > i_data )
 639             break;
 640         if( n <= 0 )
 641             continue;
 642
 643         psz = strndup( p_data, n );
 644         RM(n);
 645
 646         EnsureUTF8( psz );
 647
 648 #define IF_EXTRACT(txt,var) \
 649     if( !strncasecmp(psz, txt, strlen(txt)) ) \
 650     { \
 651         const char *oldval = vlc_meta_Get( p_sys->p_meta, vlc_meta_ ## var ); \
 652         if( oldval ) \
 653         { \
 654             char * newval; \
 655             asprintf( &newval, "%s,%s", oldval, &psz[strlen(txt)] ); \
 656             vlc_meta_Set( p_sys->p_meta, vlc_meta_ ## var, newval ); \
 657             free( newval ); \
 658         } \
 659         else \
 660             vlc_meta_Set( p_sys->p_meta, vlc_meta_ ## var, &psz[strlen(txt)] ); \
 661     }
 662         IF_EXTRACT("TITLE=", Title )
 663         else IF_EXTRACT("ALBUM=", Album )
 664         else IF_EXTRACT("TRACKNUMBER=", TrackNumber )
 665         else IF_EXTRACT("ARTIST=", Artist )
 666         else IF_EXTRACT("COPYRIGHT=", Copyright )
 667         else IF_EXTRACT("DESCRIPTION=", Description )
 668         else IF_EXTRACT("GENRE=", Genre )
 669         else IF_EXTRACT("DATE=", Date )
 670         else if( strchr( psz, '=' ) )
 671         {
 672             /* generic (PERFORMER/LICENSE/ORGANIZATION/LOCATION/CONTACT/ISRC,
 673              * undocumented tags and replay gain ) */
 674             audio_replay_gain_t *r = &p_sys->replay_gain;
 675             char *p = strchr( psz, '=' );
 676             *p++ = '\0';
 677             vlc_meta_AddExtra( p_sys->p_meta, psz, p );
 678         }
 679 #undef IF_EXTRACT
 680         free( psz );
 681     }
 682 #undef RM
 683 }
 684
 685 static void ParsePicture( demux_t *p_demux, const uint8_t *p_data, int i_data )
 686 {
 687     static const int pi_cover_score[] = {
 688         0,      /* other */
 689         2, 1,   /* icons */
 690         10,     /* front cover */
 691         9,      /* back cover */
 692         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 693         6,      /* movie/video screen capture */
 694         0,
 695         7,      /* Illustration */
 696         8,      /* Band/Artist logotype */
 697         0,      /* Publisher/Studio */
 698     };
 699     demux_sys_t *p_sys = p_demux->p_sys;
 700     int i_type;
 701     int i_len;
 702     char *psz_mime = NULL;
 703     char *psz_description = NULL;
 704     input_attachment_t *p_attachment;
 705     char psz_name[128];
 706
 707     if( i_data < 4 + 3*4 )
 708         return;
 709 #define RM(x) do { i_data -= (x); p_data += (x); } while(0)
 710     RM(4);
 711
 712     i_type = GetDWBE( p_data ); RM(4);
 713     i_len = GetDWBE( p_data ); RM(4);
 714     if( i_data < i_len + 4 )
 715         goto error;
 716     psz_mime = strndup( p_data, i_len ); RM(i_len);
 717     i_len = GetDWBE( p_data ); RM(4);
 718     if( i_data < i_len + 4*4 + 4)
 719         goto error;
 720     psz_description = strndup( p_data, i_len ); RM(i_len);
 721     EnsureUTF8( psz_description );
 722     RM(4*4);
 723     i_len = GetDWBE( p_data ); RM(4);
 724     if( i_len > i_data )
 725         goto error;
 726
 727     msg_Dbg( p_demux, "FLAC: Picture type=%d mime=%s description='%s' file length=%d",
 728              i_type, psz_mime, psz_description, i_len );
 729
 730     snprintf( psz_name, sizeof(psz_name), "picture%d", p_sys->i_attachments );
 731     if( !strcasecmp( psz_mime, "image/jpeg" ) )
 732         strcat( psz_name, ".jpg" );
 733     else if( !strcasecmp( psz_mime, "image/png" ) )
 734         strcat( psz_name, ".png" );
 735
 736     p_attachment = vlc_input_attachment_New( psz_name, psz_mime, psz_description,
 737                                              p_data, i_data );
 738     TAB_APPEND( p_sys->i_attachments, p_sys->attachments, p_attachment );
 739
 740     if( i_type >= 0 && i_type < sizeof(pi_cover_score)/sizeof(pi_cover_score[0]) &&
 741         p_sys->i_cover_score < pi_cover_score[i_type] )
 742     {
 743         p_sys->i_cover_idx = p_sys->i_attachments-1;
 744         p_sys->i_cover_score = pi_cover_score[i_type];
 745     }
 746 error:
 747     if( psz_mime )
 748         free( psz_mime );
 749     if( psz_description )
 750         free( psz_description );
 751 }
 752 #undef RM
 753