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     p_demux->p_private = malloc( sizeof( demux_meta_t ) );
 159     if( !p_demux->p_private )
 160         return VLC_ENOMEM;
 161     if( ( p_id3 = module_Need( p_demux, "meta reader", NULL, 0 ) ) )
 162     {
 163         demux_meta_t *p_demux_meta = (demux_meta_t *)p_demux->p_private;
 164         vlc_meta_t *p_meta = p_demux_meta->p_meta;
 165
 166         if( !p_sys->p_meta )
 167         {
 168             p_sys->p_meta = p_meta;
 169         }
 170         else if( p_meta )
 171         {
 172             vlc_meta_Merge( p_sys->p_meta, p_meta );
 173             vlc_meta_Delete( p_meta );
 174         }
 175         p_demux->p_private = NULL;
 176         module_Unneed( p_demux, p_id3 );
 177         int i;
 178         for( i = 0; i < p_demux_meta->i_attachments; i++ )
 179             TAB_APPEND_CAST( (input_attachment_t**),
 180                     p_sys->i_attachments, p_sys->attachments,
 181                     p_demux_meta->attachments[p_demux_meta->i_attachments] );
 182
 183         TAB_CLEAN( p_demux_meta->i_attachments, p_demux_meta->attachments );
 184     }
 185     free( p_demux->p_private );
 186
 187     if( p_sys->i_cover_idx < p_sys->i_attachments )
 188     {
 189         char psz_url[128];
 190         if( !p_sys->p_meta )
 191             p_sys->p_meta = vlc_meta_New();
 192         snprintf( psz_url, sizeof(psz_url), "attachment://%s",
 193                   p_sys->attachments[p_sys->i_cover_idx]->psz_name );
 194         vlc_meta_Set( p_sys->p_meta, vlc_meta_ArtworkURL, psz_url );
 195     }
 196     vlc_audio_replay_gain_MergeFromMeta( &p_sys->replay_gain, p_sys->p_meta );
 197     return VLC_SUCCESS;
 198 }
 199
 200 /*****************************************************************************
 201  * Close: frees unused data
 202  *****************************************************************************/
 203 static void Close( vlc_object_t * p_this )
 204 {
 205     demux_t     *p_demux = (demux_t*)p_this;
 206     demux_sys_t *p_sys = p_demux->p_sys;
 207
 208     TAB_CLEAN( p_sys->i_seekpoint, p_sys->seekpoint );
 209
 210     int i;
 211     for( i = 0; i < p_sys->i_attachments; i++ )
 212         free( p_sys->attachments[i] );
 213     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 214
 215     /* Unneed module */
 216     module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
 217
 218     if( p_sys->p_packetizer->fmt_in.p_extra )
 219         free( p_sys->p_packetizer->fmt_in.p_extra );
 220
 221     /* Delete the decoder */
 222     vlc_object_destroy( p_sys->p_packetizer );
 223     if( p_sys->p_meta )
 224         vlc_meta_Delete( p_sys->p_meta );
 225     free( p_sys );
 226 }
 227
 228 /*****************************************************************************
 229  * Demux: reads and demuxes data packets
 230  *****************************************************************************
 231  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 232  *****************************************************************************/
 233 static int Demux( demux_t *p_demux )
 234 {
 235     demux_sys_t *p_sys = p_demux->p_sys;
 236     block_t     *p_block_in, *p_block_out;
 237
 238     if( !( p_block_in = stream_Block( p_demux->s, FLAC_PACKET_SIZE ) ) )
 239         return 0;
 240
 241     p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start ? 1 : 0;
 242     p_sys->b_start = VLC_FALSE;
 243
 244     while( (p_block_out = p_sys->p_packetizer->pf_packetize(
 245                 p_sys->p_packetizer, &p_block_in )) )
 246     {
 247         while( p_block_out )
 248         {
 249             block_t *p_next = p_block_out->p_next;
 250
 251             p_block_out->p_next = NULL;
 252
 253             if( p_sys->p_es == NULL )
 254             {
 255                 p_sys->p_packetizer->fmt_out.b_packetized = VLC_TRUE;
 256                 p_sys->p_packetizer->fmt_out.audio_replay_gain = p_sys->replay_gain;
 257                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
 258             }
 259
 260             /* set PCR */
 261             if( p_block_out->i_dts >= p_sys->i_pts_start )
 262                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
 263             else
 264                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 265
 266             p_sys->i_pts = p_block_out->i_dts;
 267             es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
 268
 269             p_block_out = p_next;
 270         }
 271     }
 272     return 1;
 273 }
 274
 275 /*****************************************************************************
 276  * Control:
 277  *****************************************************************************/
 278 static int64_t ControlGetLength( demux_t *p_demux )
 279 {
 280     demux_sys_t *p_sys = p_demux->p_sys;
 281     const int64_t i_size = stream_Size(p_demux->s) - p_sys->i_data_pos;
 282     int64_t i_length = p_sys->i_length;
 283     int i;
 284
 285     /* Try to fix length using seekpoint and current size for truncated file */
 286     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 287     {
 288         seekpoint_t *s = p_sys->seekpoint[i];
 289         if( s->i_byte_offset <= i_size )
 290         {
 291             if( i+1 < p_sys->i_seekpoint )
 292             {
 293                 /* Broken file */
 294                 seekpoint_t *n = p_sys->seekpoint[i+1];
 295                 assert( n->i_byte_offset != s->i_byte_offset); /* Should be ensured by ParseSeekTable */
 296                 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);
 297             }
 298             break;
 299         }
 300     }
 301     return i_length;
 302 }
 303
 304 static int64_t ControlGetTime( demux_t *p_demux )
 305 {
 306     demux_sys_t *p_sys = p_demux->p_sys;
 307     return __MAX(p_sys->i_pts, p_sys->i_pts_start) + p_sys->i_time_offset;
 308 }
 309
 310 static int ControlSetTime( demux_t *p_demux, int64_t i_time )
 311 {
 312     demux_sys_t *p_sys = p_demux->p_sys;
 313     int64_t i_next_time;
 314     int64_t i_next_offset;
 315     int64_t i_delta_time;
 316     int64_t i_delta_offset;
 317     vlc_bool_t b_seekable;
 318     int i;
 319
 320     /* */
 321     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
 322     if( !b_seekable )
 323         return VLC_EGENERIC;
 324
 325     /* */
 326     assert( p_sys->i_seekpoint > 0 );   /* ReadMeta ensure at least (0,0) */
 327     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 328     {
 329         if( p_sys->seekpoint[i]->i_time_offset <= i_time )
 330             break;
 331     }
 332     if( i+1 < p_sys->i_seekpoint )
 333     {
 334         i_next_time   = p_sys->seekpoint[i+1]->i_time_offset;
 335         i_next_offset = p_sys->seekpoint[i+1]->i_byte_offset;
 336     }
 337     else
 338     {
 339         i_next_time   = p_sys->i_length;
 340         i_next_offset = stream_Size(p_demux->s)-p_sys->i_data_pos;
 341     }
 342     i_delta_time = i_time - p_sys->seekpoint[i]->i_time_offset;
 343     i_delta_offset = (i_next_offset - p_sys->seekpoint[i]->i_byte_offset) * i_delta_time /
 344                             (p_sys->seekpoint[i+1]->i_time_offset-p_sys->seekpoint[i]->i_time_offset);
 345
 346     /* XXX We do exact seek if it's not too far away(45s) */
 347     if( i_delta_time < 45*I64C(1000000) )
 348     {
 349         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos ) )
 350             return VLC_EGENERIC;
 351         p_sys->i_time_offset = p_sys->seekpoint[i]->i_time_offset - p_sys->i_pts;
 352         p_sys->i_pts_start = p_sys->i_pts+i_delta_time;
 353         es_out_Control( p_demux->out, ES_OUT_SET_NEXT_DISPLAY_TIME, p_sys->p_es, p_sys->i_pts_start );
 354     }
 355     else
 356     {
 357         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos + i_delta_offset ) )
 358             return VLC_EGENERIC;
 359         p_sys->i_pts_start = p_sys->i_pts;
 360         p_sys->i_time_offset = (p_sys->seekpoint[i]->i_time_offset+i_delta_time) - p_sys->i_pts;
 361     }
 362     return VLC_SUCCESS;
 363 }
 364
 365 static int Control( demux_t *p_demux, int i_query, va_list args )
 366 {
 367     demux_sys_t *p_sys = p_demux->p_sys;
 368
 369     if( i_query == DEMUX_GET_META )
 370     {
 371         vlc_meta_t *p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t* );
 372         if( p_demux->p_sys->p_meta )
 373             vlc_meta_Merge( p_meta, p_demux->p_sys->p_meta );
 374         return VLC_SUCCESS;
 375     }
 376     else if( i_query == DEMUX_GET_LENGTH )
 377     {
 378         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 379         *pi64 = ControlGetLength( p_demux );
 380         return VLC_SUCCESS;
 381     }
 382     else if( i_query == DEMUX_SET_TIME )
 383     {
 384         int64_t i_time = (int64_t)va_arg( args, int64_t );
 385         return ControlSetTime( p_demux, i_time );
 386     }
 387     else if( i_query == DEMUX_SET_POSITION )
 388     {
 389         const double f = (double)va_arg( args, double );
 390         int64_t i_time = f * ControlGetLength( p_demux );
 391         return ControlSetTime( p_demux, i_time );
 392     }
 393     else if( i_query == DEMUX_GET_TIME )
 394     {
 395         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 396         *pi64 = ControlGetTime( p_demux );
 397         return VLC_SUCCESS;
 398     }
 399     else if( i_query == DEMUX_GET_POSITION )
 400     {
 401         double *pf = (double*)va_arg( args, double * );
 402         const int64_t i_length = ControlGetLength(p_demux);
 403         if( i_length > 0 )
 404             *pf = (double)ControlGetTime(p_demux) / (double)i_length;
 405         else
 406             *pf= 0.0;
 407         return VLC_SUCCESS;
 408     }
 409     else if( i_query == DEMUX_GET_ATTACHMENTS )
 410     {
 411         input_attachment_t ***ppp_attach =
 412             (input_attachment_t***)va_arg( args, input_attachment_t*** );
 413         int *pi_int = (int*)va_arg( args, int * );
 414         int i;
 415
 416         if( p_sys->i_attachments <= 0 )
 417             return VLC_EGENERIC;
 418
 419         *pi_int = p_sys->i_attachments;;
 420         *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
 421         for( i = 0; i < p_sys->i_attachments; i++ )
 422             (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
 423         return VLC_SUCCESS;
 424     }
 425
 426     return demux2_vaControlHelper( p_demux->s, p_sys->i_data_pos, -1,
 427                                    8*0, 1, i_query, args );
 428 }
 429
 430 enum
 431 {
 432     META_STREAMINFO = 0,
 433     META_SEEKTABLE = 3,
 434     META_COMMENT = 4,
 435     META_PICTURE = 6,
 436 };
 437
 438 static inline int Get24bBE( const uint8_t *p )
 439 {
 440     return (p[0] << 16)|(p[1] << 8)|(p[2]);
 441 }
 442
 443 static void ParseStreamInfo( demux_t *p_demux, int *pi_rate, int64_t *pi_count, uint8_t *p_data, int i_data );
 444 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 445                             int i_sample_rate );
 446 static void ParseComment( demux_t *, const uint8_t *p_data, int i_data );
 447 static void ParsePicture( demux_t *, const uint8_t *p_data, int i_data );
 448
 449 static int  ReadMeta( demux_t *p_demux, uint8_t **pp_streaminfo, int *pi_streaminfo )
 450 {
 451     demux_sys_t *p_sys = p_demux->p_sys;
 452     int     i_peek;
 453     const uint8_t *p_peek;
 454     vlc_bool_t b_last;
 455     int i_sample_rate;
 456     int64_t i_sample_count;
 457     seekpoint_t *s;
 458
 459     /* Read STREAMINFO */
 460     i_peek = stream_Peek( p_demux->s, &p_peek, 8 );
 461     if( (p_peek[4] & 0x7F) != META_STREAMINFO )
 462     {
 463         msg_Err( p_demux, "this isn't a STREAMINFO metadata block" );
 464         return VLC_EGENERIC;
 465     }
 466     if( Get24bBE(&p_peek[5]) != (STREAMINFO_SIZE - 4) )
 467     {
 468         msg_Err( p_demux, "invalid size for a STREAMINFO metadata block" );
 469         return VLC_EGENERIC;
 470     }
 471
 472     *pi_streaminfo = 4 + STREAMINFO_SIZE;
 473     *pp_streaminfo = malloc( 4 + STREAMINFO_SIZE );
 474     if( *pp_streaminfo == NULL )
 475         return VLC_EGENERIC;
 476
 477     if( stream_Read( p_demux->s, *pp_streaminfo, 4+STREAMINFO_SIZE ) != 4+STREAMINFO_SIZE )
 478     {
 479         msg_Err( p_demux, "failed to read STREAMINFO metadata block" );
 480         free( *pp_streaminfo );
 481         return VLC_EGENERIC;
 482     }
 483
 484     /* */
 485     ParseStreamInfo( p_demux, &i_sample_rate, &i_sample_count,  *pp_streaminfo, *pi_streaminfo );
 486     if( i_sample_rate > 0 )
 487         p_sys->i_length = i_sample_count * I64C(1000000)/i_sample_rate;
 488
 489     /* Be sure we have seekpoint 0 */
 490     s = vlc_seekpoint_New();
 491     s->i_time_offset = 0;
 492     s->i_byte_offset = 0;
 493     TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 494
 495     b_last = (*pp_streaminfo)[4]&0x80;
 496     while( !b_last )
 497     {
 498         int i_len;
 499         int i_type;
 500
 501         i_peek = stream_Peek( p_demux->s, &p_peek, 4 );
 502         if( i_peek < 4 )
 503             break;
 504         b_last = p_peek[0]&0x80;
 505         i_type = p_peek[0]&0x7f;
 506         i_len  = Get24bBE( &p_peek[1] );
 507
 508         if( i_type == META_SEEKTABLE )
 509         {
 510             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 511             if( i_peek == 4+i_len )
 512                 ParseSeekTable( p_demux, p_peek, i_peek, i_sample_rate );
 513         }
 514         else if( i_type == META_COMMENT )
 515         {
 516             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 517             if( i_peek == 4+i_len )
 518                 ParseComment( p_demux, p_peek, i_peek );
 519         }
 520         else if( i_type == META_PICTURE )
 521         {
 522             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 523             if( i_peek == 4+i_len )
 524                 ParsePicture( p_demux, p_peek, i_peek );
 525         }
 526
 527         if( stream_Read( p_demux->s, NULL, 4+i_len ) < 4+i_len )
 528             break;
 529     }
 530
 531     /* */
 532     p_sys->i_data_pos = stream_Tell( p_demux->s );
 533
 534     return VLC_SUCCESS;
 535 }
 536 static void ParseStreamInfo( demux_t *p_demux, int *pi_rate, int64_t *pi_count, uint8_t *p_data, int i_data )
 537 {
 538     const int i_skip = 4+4;
 539
 540     *pi_rate = GetDWBE(&p_data[i_skip+4+6]) >> 12;
 541     *pi_count = GetQWBE(&p_data[i_skip+4+6]) &  ((I64C(1)<<36)-1);
 542 }
 543
 544 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 545                             int i_sample_rate )
 546 {
 547     demux_sys_t *p_sys = p_demux->p_sys;
 548     seekpoint_t *s;
 549     int i;
 550
 551     if( i_sample_rate <= 0 )
 552         return;
 553
 554     /* */
 555     for( i = 0; i < (i_data-4)/18; i++ )
 556     {
 557         const int64_t i_sample = GetQWBE( &p_data[4+18*i+0] );
 558         int j;
 559
 560         if( i_sample < 0 || i_sample >= INT64_MAX )
 561             continue;
 562
 563         s = vlc_seekpoint_New();
 564         s->i_time_offset = i_sample * I64C(1000000)/i_sample_rate;
 565         s->i_byte_offset = GetQWBE( &p_data[4+18*i+8] );
 566
 567         /* Check for duplicate entry */
 568         for( j = 0; j < p_sys->i_seekpoint; j++ )
 569         {
 570             if( p_sys->seekpoint[j]->i_time_offset == s->i_time_offset ||
 571                 p_sys->seekpoint[j]->i_byte_offset == s->i_byte_offset )
 572             {
 573                 vlc_seekpoint_Delete( s );
 574                 s = NULL;
 575                 break;
 576             }
 577         }
 578         if( s )
 579         {
 580             TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 581         }
 582     }
 583     /* TODO sort it by size and remove wrong seek entry (time not increasing) */
 584 }
 585
 586 #define RM(x) do { i_data -= (x); p_data += (x); } while(0)
 587 static void ParseComment( demux_t *p_demux, const uint8_t *p_data, int i_data )
 588 {
 589     demux_sys_t *p_sys = p_demux->p_sys;
 590     int n;
 591     int i_comment;
 592
 593     if( i_data < 8 )
 594         return;
 595
 596     RM(4);
 597
 598     n = GetDWLE(p_data); RM(4);
 599     if( n < 0 || n > i_data )
 600         return;
 601 #if 0
 602     if( n > 0 )
 603     {
 604         /* TODO report vendor string ? */
 605         char *psz_vendor = psz_vendor = strndup( p_data, n );
 606         msg_Dbg( p_demux, "FLAC: COMMENT vendor length=%d vendor=%s\n", n, psz_vendor );
 607         free( psz_vendor );
 608     }
 609 #endif
 610     RM(n);
 611
 612     if( i_data < 4 )
 613         return;
 614
 615     i_comment = GetDWLE(p_data); RM(4);
 616     if( i_comment <= 0 )
 617         return;
 618
 619     p_sys->p_meta = vlc_meta_New();
 620
 621     for( ; i_comment > 0; i_comment-- )
 622     {
 623         char *psz;
 624         if( i_data < 4 )
 625             break;
 626         n = GetDWLE(p_data); RM(4);
 627         if( n > i_data )
 628             break;
 629         if( n <= 0 )
 630             continue;
 631
 632         psz = strndup( p_data, n );
 633         RM(n);
 634
 635         EnsureUTF8( psz );
 636
 637 #define IF_EXTRACT(txt,var) \
 638     if( !strncasecmp(psz, txt, strlen(txt)) ) \
 639     { \
 640         const char *oldval = vlc_meta_Get( p_sys->p_meta, vlc_meta_ ## var ); \
 641         if( oldval ) \
 642         { \
 643             char * newval; \
 644             asprintf( &newval, "%s,%s", oldval, &psz[strlen(txt)] ); \
 645             vlc_meta_Set( p_sys->p_meta, vlc_meta_ ## var, newval ); \
 646             free( newval ); \
 647         } \
 648         else \
 649             vlc_meta_Set( p_sys->p_meta, vlc_meta_ ## var, &psz[strlen(txt)] ); \
 650     }
 651         IF_EXTRACT("TITLE=", Title )
 652         else IF_EXTRACT("ALBUM=", Album )
 653         else IF_EXTRACT("TRACKNUMBER=", TrackNumber )
 654         else IF_EXTRACT("ARTIST=", Artist )
 655         else IF_EXTRACT("COPYRIGHT=", Copyright )
 656         else IF_EXTRACT("DESCRIPTION=", Description )
 657         else IF_EXTRACT("GENRE=", Genre )
 658         else IF_EXTRACT("DATE=", Date )
 659         else if( strchr( psz, '=' ) )
 660         {
 661             /* generic (PERFORMER/LICENSE/ORGANIZATION/LOCATION/CONTACT/ISRC,
 662              * undocumented tags and replay gain ) */
 663             audio_replay_gain_t *r = &p_sys->replay_gain;
 664             char *p = strchr( psz, '=' );
 665             *p++ = '\0';
 666             vlc_meta_AddExtra( p_sys->p_meta, psz, p );
 667         }
 668 #undef IF_EXTRACT
 669         free( psz );
 670     }
 671 #undef RM
 672 }
 673
 674 static void ParsePicture( demux_t *p_demux, const uint8_t *p_data, int i_data )
 675 {
 676     static const int pi_cover_score[] = {
 677         0,      /* other */
 678         2, 1,   /* icons */
 679         10,     /* front cover */
 680         9,      /* back cover */
 681         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 682         6,      /* movie/video screen capture */
 683         0,
 684         7,      /* Illustration */
 685         8,      /* Band/Artist logotype */
 686         0,      /* Publisher/Studio */
 687     };
 688     demux_sys_t *p_sys = p_demux->p_sys;
 689     int i_type;
 690     int i_len;
 691     char *psz_mime = NULL;
 692     char *psz_description = NULL;
 693     input_attachment_t *p_attachment;
 694     char psz_name[128];
 695
 696     if( i_data < 4 + 3*4 )
 697         return;
 698 #define RM(x) do { i_data -= (x); p_data += (x); } while(0)
 699     RM(4);
 700
 701     i_type = GetDWBE( p_data ); RM(4);
 702     i_len = GetDWBE( p_data ); RM(4);
 703     if( i_data < i_len + 4 )
 704         goto error;
 705     psz_mime = strndup( p_data, i_len ); RM(i_len);
 706     i_len = GetDWBE( p_data ); RM(4);
 707     if( i_data < i_len + 4*4 + 4)
 708         goto error;
 709     psz_description = strndup( p_data, i_len ); RM(i_len);
 710     EnsureUTF8( psz_description );
 711     RM(4*4);
 712     i_len = GetDWBE( p_data ); RM(4);
 713     if( i_len > i_data )
 714         goto error;
 715
 716     msg_Dbg( p_demux, "FLAC: Picture type=%d mime=%s description='%s' file length=%d",
 717              i_type, psz_mime, psz_description, i_len );
 718
 719     snprintf( psz_name, sizeof(psz_name), "picture%d", p_sys->i_attachments );
 720     if( !strcasecmp( psz_mime, "image/jpeg" ) )
 721         strcat( psz_name, ".jpg" );
 722     else if( !strcasecmp( psz_mime, "image/png" ) )
 723         strcat( psz_name, ".png" );
 724
 725     p_attachment = vlc_input_attachment_New( psz_name, psz_mime, psz_description,
 726                                              p_data, i_data );
 727     TAB_APPEND( p_sys->i_attachments, p_sys->attachments, p_attachment );
 728
 729     if( i_type >= 0 && i_type < sizeof(pi_cover_score)/sizeof(pi_cover_score[0]) &&
 730         p_sys->i_cover_score < pi_cover_score[i_type] )
 731     {
 732         p_sys->i_cover_idx = p_sys->i_attachments-1;
 733         p_sys->i_cover_score = pi_cover_score[i_type];
 734     }
 735 error:
 736     if( psz_mime )
 737         free( psz_mime );
 738     if( psz_description )
 739         free( psz_description );
 740 }
 741 #undef RM
 742