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 #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>
  36 #include <vlc_input.h>
  37 #include <vlc_codec.h>
  38 #include <assert.h>
  39 #include <vlc_charset.h>
  40
  41 /*****************************************************************************
  42  * Module descriptor
  43  *****************************************************************************/
  44 static int  Open  ( vlc_object_t * );
  45 static void Close ( vlc_object_t * );
  46
  47 vlc_module_begin();
  48     set_description( N_("FLAC demuxer") );
  49     set_capability( "demux", 155 );
  50     set_category( CAT_INPUT );
  51     set_subcategory( SUBCAT_INPUT_DEMUX );
  52     set_callbacks( Open, Close );
  53     add_shortcut( "flac" );
  54 vlc_module_end();
  55
  56 /*****************************************************************************
  57  * Local prototypes
  58  *****************************************************************************/
  59 static int Demux  ( demux_t * );
  60 static int Control( demux_t *, int, va_list );
  61
  62 static int  ReadMeta( demux_t *, uint8_t **pp_streaminfo, int *pi_streaminfo );
  63
  64 struct demux_sys_t
  65 {
  66     bool  b_start;
  67     es_out_id_t *p_es;
  68
  69     /* Packetizer */
  70     decoder_t *p_packetizer;
  71
  72     vlc_meta_t *p_meta;
  73     audio_replay_gain_t replay_gain;
  74
  75     int64_t i_time_offset;
  76     int64_t i_pts;
  77     int64_t i_pts_start;
  78
  79     int64_t i_length; /* Length from stream info */
  80     int64_t i_data_pos;
  81
  82     /* */
  83     int         i_seekpoint;
  84     seekpoint_t **seekpoint;
  85
  86     /* */
  87     int                i_attachments;
  88     input_attachment_t **attachments;
  89     int                i_cover_idx;
  90     int                i_cover_score;
  91 };
  92
  93 #define STREAMINFO_SIZE 38
  94 #define FLAC_PACKET_SIZE 16384
  95
  96 /*****************************************************************************
  97  * Open: initializes ES structures
  98  *****************************************************************************/
  99 static int Open( vlc_object_t * p_this )
 100 {
 101     demux_t     *p_demux = (demux_t*)p_this;
 102     demux_sys_t *p_sys;
 103     const uint8_t *p_peek;
 104     uint8_t     *p_streaminfo;
 105     int         i_streaminfo;
 106     es_format_t fmt;
 107
 108     /* Have a peep at the show. */
 109     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
 110
 111     if( p_peek[0]!='f' || p_peek[1]!='L' || p_peek[2]!='a' || p_peek[3]!='C' )
 112     {
 113         if( !p_demux->b_force ) return VLC_EGENERIC;
 114
 115         /* User forced */
 116         msg_Err( p_demux, "this doesn't look like a flac stream, "
 117                  "continuing anyway" );
 118     }
 119
 120     p_demux->pf_demux   = Demux;
 121     p_demux->pf_control = Control;
 122     p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );
 123     p_sys->b_start = true;
 124     p_sys->p_meta = NULL;
 125     memset( &p_sys->replay_gain, 0, sizeof(p_sys->replay_gain) );
 126     p_sys->i_length = 0;
 127     p_sys->i_time_offset = 0;
 128     p_sys->i_pts = 0;
 129     p_sys->i_pts_start = 0;
 130     p_sys->p_es = NULL;
 131     TAB_INIT( p_sys->i_seekpoint, p_sys->seekpoint );
 132     TAB_INIT( p_sys->i_attachments, p_sys->attachments);
 133     p_sys->i_cover_idx = 0;
 134     p_sys->i_cover_score = 0;
 135
 136     /* We need to read and store the STREAMINFO metadata */
 137     if( ReadMeta( p_demux, &p_streaminfo, &i_streaminfo ) )
 138     {
 139         free( p_sys );
 140         return VLC_EGENERIC;
 141     }
 142
 143     /* Load the FLAC packetizer */
 144     /* Store STREAMINFO for the decoder and packetizer */
 145     p_streaminfo[4] |= 0x80; /* Fake this as the last metadata block */
 146     es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'f', 'l', 'a', 'c' ) );
 147     fmt.i_extra = i_streaminfo;
 148     fmt.p_extra = p_streaminfo;
 149
 150     p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, "flac" );
 151     if( !p_sys->p_packetizer )
 152     {
 153         free( p_sys );
 154         return VLC_EGENERIC;
 155     }
 156
 157     if( p_sys->i_cover_idx < p_sys->i_attachments )
 158     {
 159         char psz_url[128];
 160         if( !p_sys->p_meta )
 161             p_sys->p_meta = vlc_meta_New();
 162         snprintf( psz_url, sizeof(psz_url), "attachment://%s",
 163                   p_sys->attachments[p_sys->i_cover_idx]->psz_name );
 164         vlc_meta_Set( p_sys->p_meta, vlc_meta_ArtworkURL, psz_url );
 165     }
 166     vlc_audio_replay_gain_MergeFromMeta( &p_sys->replay_gain, p_sys->p_meta );
 167     return VLC_SUCCESS;
 168 }
 169
 170 /*****************************************************************************
 171  * Close: frees unused data
 172  *****************************************************************************/
 173 static void Close( vlc_object_t * p_this )
 174 {
 175     demux_t     *p_demux = (demux_t*)p_this;
 176     demux_sys_t *p_sys = p_demux->p_sys;
 177
 178     TAB_CLEAN( p_sys->i_seekpoint, p_sys->seekpoint );
 179
 180     int i;
 181     for( i = 0; i < p_sys->i_attachments; i++ )
 182         free( p_sys->attachments[i] );
 183     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 184
 185     /* Delete the decoder */
 186     demux_PacketizerDestroy( p_sys->p_packetizer );
 187
 188     if( p_sys->p_meta )
 189         vlc_meta_Delete( p_sys->p_meta );
 190     free( p_sys );
 191 }
 192
 193 /*****************************************************************************
 194  * Demux: reads and demuxes data packets
 195  *****************************************************************************
 196  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 197  *****************************************************************************/
 198 static int Demux( demux_t *p_demux )
 199 {
 200     demux_sys_t *p_sys = p_demux->p_sys;
 201     block_t     *p_block_in, *p_block_out;
 202
 203     if( !( p_block_in = stream_Block( p_demux->s, FLAC_PACKET_SIZE ) ) )
 204         return 0;
 205
 206     p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start ? 1 : 0;
 207     p_sys->b_start = false;
 208
 209     while( (p_block_out = p_sys->p_packetizer->pf_packetize(
 210                 p_sys->p_packetizer, &p_block_in )) )
 211     {
 212         while( p_block_out )
 213         {
 214             block_t *p_next = p_block_out->p_next;
 215
 216             p_block_out->p_next = NULL;
 217
 218             if( p_sys->p_es == NULL )
 219             {
 220                 p_sys->p_packetizer->fmt_out.b_packetized = true;
 221                 p_sys->p_packetizer->fmt_out.audio_replay_gain = p_sys->replay_gain;
 222                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
 223             }
 224
 225             p_sys->i_pts = p_block_out->i_dts;
 226
 227             /* Correct timestamp */
 228             p_block_out->i_pts += p_sys->i_time_offset;
 229             p_block_out->i_dts += p_sys->i_time_offset;
 230
 231             /* set PCR */
 232             es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
 233
 234             es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
 235
 236             p_block_out = p_next;
 237         }
 238     }
 239     return 1;
 240 }
 241
 242 /*****************************************************************************
 243  * Control:
 244  *****************************************************************************/
 245 static int64_t ControlGetLength( demux_t *p_demux )
 246 {
 247     demux_sys_t *p_sys = p_demux->p_sys;
 248     const int64_t i_size = stream_Size(p_demux->s) - p_sys->i_data_pos;
 249     int64_t i_length = p_sys->i_length;
 250     int i;
 251
 252     /* Try to fix length using seekpoint and current size for truncated file */
 253     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 254     {
 255         seekpoint_t *s = p_sys->seekpoint[i];
 256         if( s->i_byte_offset <= i_size )
 257         {
 258             if( i+1 < p_sys->i_seekpoint )
 259             {
 260                 /* Broken file */
 261                 seekpoint_t *n = p_sys->seekpoint[i+1];
 262                 assert( n->i_byte_offset != s->i_byte_offset); /* Should be ensured by ParseSeekTable */
 263                 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);
 264             }
 265             break;
 266         }
 267     }
 268     return i_length;
 269 }
 270
 271 static int64_t ControlGetTime( demux_t *p_demux )
 272 {
 273     demux_sys_t *p_sys = p_demux->p_sys;
 274     return __MAX(p_sys->i_pts, p_sys->i_pts_start) + p_sys->i_time_offset;
 275 }
 276
 277 static int ControlSetTime( demux_t *p_demux, int64_t i_time )
 278 {
 279     demux_sys_t *p_sys = p_demux->p_sys;
 280     int64_t i_delta_time;
 281     bool b_seekable;
 282     int i;
 283
 284     /* */
 285     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
 286     if( !b_seekable )
 287         return VLC_EGENERIC;
 288
 289     /* */
 290     assert( p_sys->i_seekpoint > 0 );   /* ReadMeta ensure at least (0,0) */
 291     for( i = p_sys->i_seekpoint-1; i >= 0; i-- )
 292     {
 293         if( p_sys->seekpoint[i]->i_time_offset <= i_time )
 294             break;
 295     }
 296     i_delta_time = i_time - p_sys->seekpoint[i]->i_time_offset;
 297
 298     /* XXX We do exact seek if it's not too far away(45s) */
 299     if( i_delta_time < 45*INT64_C(1000000) )
 300     {
 301         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos ) )
 302             return VLC_EGENERIC;
 303
 304         p_sys->i_time_offset = p_sys->seekpoint[i]->i_time_offset - p_sys->i_pts;
 305         p_sys->i_pts_start = p_sys->i_pts+i_delta_time;
 306         es_out_Control( p_demux->out, ES_OUT_SET_NEXT_DISPLAY_TIME, p_sys->i_pts_start + p_sys->i_time_offset );
 307     }
 308     else
 309     {
 310         int64_t i_delta_offset;
 311         int64_t i_next_time;
 312         int64_t i_next_offset;
 313
 314         if( i+1 < p_sys->i_seekpoint )
 315         {
 316             i_next_time   = p_sys->seekpoint[i+1]->i_time_offset;
 317             i_next_offset = p_sys->seekpoint[i+1]->i_byte_offset;
 318         }
 319         else
 320         {
 321             i_next_time   = p_sys->i_length;
 322             i_next_offset = stream_Size(p_demux->s)-p_sys->i_data_pos;
 323         }
 324
 325         i_delta_offset = 0;
 326         if( i_next_time-p_sys->seekpoint[i]->i_time_offset > 0 )
 327             i_delta_offset = (i_next_offset - p_sys->seekpoint[i]->i_byte_offset) * i_delta_time /
 328                              (i_next_time-p_sys->seekpoint[i]->i_time_offset);
 329
 330         if( stream_Seek( p_demux->s, p_sys->seekpoint[i]->i_byte_offset+p_sys->i_data_pos + i_delta_offset ) )
 331             return VLC_EGENERIC;
 332
 333         p_sys->i_pts_start = p_sys->i_pts;
 334         p_sys->i_time_offset = (p_sys->seekpoint[i]->i_time_offset+i_delta_time) - p_sys->i_pts;
 335     }
 336     return VLC_SUCCESS;
 337 }
 338
 339 static int Control( demux_t *p_demux, int i_query, va_list args )
 340 {
 341     demux_sys_t *p_sys = p_demux->p_sys;
 342
 343     if( i_query == DEMUX_GET_META )
 344     {
 345         vlc_meta_t *p_meta = (vlc_meta_t *)va_arg( args, vlc_meta_t* );
 346         if( p_demux->p_sys->p_meta )
 347             vlc_meta_Merge( p_meta, p_demux->p_sys->p_meta );
 348         return VLC_SUCCESS;
 349     }
 350     else if( i_query == DEMUX_HAS_UNSUPPORTED_META )
 351     {
 352         bool *pb_bool = (bool*)va_arg( args, bool* );
 353         *pb_bool = true;
 354         return VLC_SUCCESS;
 355     }
 356     else if( i_query == DEMUX_GET_LENGTH )
 357     {
 358         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 359         *pi64 = ControlGetLength( p_demux );
 360         return VLC_SUCCESS;
 361     }
 362     else if( i_query == DEMUX_SET_TIME )
 363     {
 364         int64_t i_time = (int64_t)va_arg( args, int64_t );
 365         return ControlSetTime( p_demux, i_time );
 366     }
 367     else if( i_query == DEMUX_SET_POSITION )
 368     {
 369         const double f = (double)va_arg( args, double );
 370         int64_t i_time = f * ControlGetLength( p_demux );
 371         return ControlSetTime( p_demux, i_time );
 372     }
 373     else if( i_query == DEMUX_GET_TIME )
 374     {
 375         int64_t *pi64 = (int64_t*)va_arg( args, int64_t * );
 376         *pi64 = ControlGetTime( p_demux );
 377         return VLC_SUCCESS;
 378     }
 379     else if( i_query == DEMUX_GET_POSITION )
 380     {
 381         double *pf = (double*)va_arg( args, double * );
 382         const int64_t i_length = ControlGetLength(p_demux);
 383         if( i_length > 0 )
 384             *pf = (double)ControlGetTime(p_demux) / (double)i_length;
 385         else
 386             *pf= 0.0;
 387         return VLC_SUCCESS;
 388     }
 389     else if( i_query == DEMUX_GET_ATTACHMENTS )
 390     {
 391         input_attachment_t ***ppp_attach =
 392             (input_attachment_t***)va_arg( args, input_attachment_t*** );
 393         int *pi_int = (int*)va_arg( args, int * );
 394         int i;
 395
 396         if( p_sys->i_attachments <= 0 )
 397             return VLC_EGENERIC;
 398
 399         *pi_int = p_sys->i_attachments;;
 400         *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
 401         for( i = 0; i < p_sys->i_attachments; i++ )
 402             (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
 403         return VLC_SUCCESS;
 404     }
 405
 406     return demux_vaControlHelper( p_demux->s, p_sys->i_data_pos, -1,
 407                                    8*0, 1, i_query, args );
 408 }
 409
 410 enum
 411 {
 412     META_STREAMINFO = 0,
 413     META_SEEKTABLE = 3,
 414     META_COMMENT = 4,
 415     META_PICTURE = 6,
 416 };
 417
 418 static inline int Get24bBE( const uint8_t *p )
 419 {
 420     return (p[0] << 16)|(p[1] << 8)|(p[2]);
 421 }
 422
 423 static void ParseStreamInfo( int *pi_rate, int64_t *pi_count, uint8_t *p_data );
 424 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 425                             int i_sample_rate );
 426 static void ParseComment( demux_t *, const uint8_t *p_data, int i_data );
 427 static void ParsePicture( demux_t *, const uint8_t *p_data, int i_data );
 428
 429 static int  ReadMeta( demux_t *p_demux, uint8_t **pp_streaminfo, int *pi_streaminfo )
 430 {
 431     demux_sys_t *p_sys = p_demux->p_sys;
 432     int     i_peek;
 433     const uint8_t *p_peek;
 434     bool b_last;
 435     int i_sample_rate;
 436     int64_t i_sample_count;
 437     seekpoint_t *s;
 438
 439     /* Read STREAMINFO */
 440     i_peek = stream_Peek( p_demux->s, &p_peek, 8 );
 441     if( (p_peek[4] & 0x7F) != META_STREAMINFO )
 442     {
 443         msg_Err( p_demux, "this isn't a STREAMINFO metadata block" );
 444         return VLC_EGENERIC;
 445     }
 446     if( Get24bBE(&p_peek[5]) != (STREAMINFO_SIZE - 4) )
 447     {
 448         msg_Err( p_demux, "invalid size for a STREAMINFO metadata block" );
 449         return VLC_EGENERIC;
 450     }
 451
 452     *pi_streaminfo = 4 + STREAMINFO_SIZE;
 453     *pp_streaminfo = malloc( 4 + STREAMINFO_SIZE );
 454     if( *pp_streaminfo == NULL )
 455         return VLC_EGENERIC;
 456
 457     if( stream_Read( p_demux->s, *pp_streaminfo, 4+STREAMINFO_SIZE ) != 4+STREAMINFO_SIZE )
 458     {
 459         msg_Err( p_demux, "failed to read STREAMINFO metadata block" );
 460         free( *pp_streaminfo );
 461         return VLC_EGENERIC;
 462     }
 463
 464     /* */
 465     ParseStreamInfo( &i_sample_rate, &i_sample_count, *pp_streaminfo );
 466     if( i_sample_rate > 0 )
 467         p_sys->i_length = i_sample_count * INT64_C(1000000)/i_sample_rate;
 468
 469     /* Be sure we have seekpoint 0 */
 470     s = vlc_seekpoint_New();
 471     s->i_time_offset = 0;
 472     s->i_byte_offset = 0;
 473     TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 474
 475     b_last = (*pp_streaminfo)[4]&0x80;
 476     while( !b_last )
 477     {
 478         int i_len;
 479         int i_type;
 480
 481         i_peek = stream_Peek( p_demux->s, &p_peek, 4 );
 482         if( i_peek < 4 )
 483             break;
 484         b_last = p_peek[0]&0x80;
 485         i_type = p_peek[0]&0x7f;
 486         i_len  = Get24bBE( &p_peek[1] );
 487
 488         if( i_type == META_SEEKTABLE )
 489         {
 490             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 491             if( i_peek == 4+i_len )
 492                 ParseSeekTable( p_demux, p_peek, i_peek, i_sample_rate );
 493         }
 494         else if( i_type == META_COMMENT )
 495         {
 496             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 497             if( i_peek == 4+i_len )
 498                 ParseComment( p_demux, p_peek, i_peek );
 499         }
 500         else if( i_type == META_PICTURE )
 501         {
 502             i_peek = stream_Peek( p_demux->s, &p_peek, 4+i_len );
 503             if( i_peek == 4+i_len )
 504                 ParsePicture( p_demux, p_peek, i_peek );
 505         }
 506
 507         if( stream_Read( p_demux->s, NULL, 4+i_len ) < 4+i_len )
 508             break;
 509     }
 510
 511     /* */
 512     p_sys->i_data_pos = stream_Tell( p_demux->s );
 513
 514     return VLC_SUCCESS;
 515 }
 516 static void ParseStreamInfo( int *pi_rate, int64_t *pi_count, uint8_t *p_data )
 517 {
 518     const int i_skip = 4+4;
 519
 520     *pi_rate = GetDWBE(&p_data[i_skip+4+6]) >> 12;
 521     *pi_count = GetQWBE(&p_data[i_skip+4+6]) &  ((INT64_C(1)<<36)-1);
 522 }
 523
 524 static void ParseSeekTable( demux_t *p_demux, const uint8_t *p_data, int i_data,
 525                             int i_sample_rate )
 526 {
 527     demux_sys_t *p_sys = p_demux->p_sys;
 528     seekpoint_t *s;
 529     int i;
 530
 531     if( i_sample_rate <= 0 )
 532         return;
 533
 534     /* */
 535     for( i = 0; i < (i_data-4)/18; i++ )
 536     {
 537         const int64_t i_sample = GetQWBE( &p_data[4+18*i+0] );
 538         int j;
 539
 540         if( i_sample < 0 || i_sample >= INT64_MAX )
 541             continue;
 542
 543         s = vlc_seekpoint_New();
 544         s->i_time_offset = i_sample * INT64_C(1000000)/i_sample_rate;
 545         s->i_byte_offset = GetQWBE( &p_data[4+18*i+8] );
 546
 547         /* Check for duplicate entry */
 548         for( j = 0; j < p_sys->i_seekpoint; j++ )
 549         {
 550             if( p_sys->seekpoint[j]->i_time_offset == s->i_time_offset ||
 551                 p_sys->seekpoint[j]->i_byte_offset == s->i_byte_offset )
 552             {
 553                 vlc_seekpoint_Delete( s );
 554                 s = NULL;
 555                 break;
 556             }
 557         }
 558         if( s )
 559         {
 560             TAB_APPEND( p_sys->i_seekpoint, p_sys->seekpoint, s );
 561         }
 562     }
 563     /* TODO sort it by size and remove wrong seek entry (time not increasing) */
 564 }
 565
 566 #define RM(x) do { i_data -= (x); p_data += (x); } while(0)
 567 static void ParseComment( demux_t *p_demux, const uint8_t *p_data, int i_data )
 568 {
 569     demux_sys_t *p_sys = p_demux->p_sys;
 570     int n;
 571     int i_comment;
 572
 573     if( i_data < 8 )
 574         return;
 575
 576     RM(4);
 577
 578     n = GetDWLE(p_data); RM(4);
 579     if( n < 0 || n > i_data )
 580         return;
 581 #if 0
 582     if( n > 0 )
 583     {
 584         /* TODO report vendor string ? */
 585         char *psz_vendor = psz_vendor = strndup( p_data, n );
 586         msg_Dbg( p_demux, "FLAC: COMMENT vendor length=%d vendor=%s\n", n, psz_vendor );
 587         free( psz_vendor );
 588     }
 589 #endif
 590     RM(n);
 591
 592     if( i_data < 4 )
 593         return;
 594
 595     i_comment = GetDWLE(p_data); RM(4);
 596     if( i_comment <= 0 )
 597         return;
 598
 599     p_sys->p_meta = vlc_meta_New();
 600
 601     for( ; i_comment > 0; i_comment-- )
 602     {
 603         char *psz;
 604         if( i_data < 4 )
 605             break;
 606         n = GetDWLE(p_data); RM(4);
 607         if( n > i_data )
 608             break;
 609         if( n <= 0 )
 610             continue;
 611
 612         psz = strndup( (const char*)p_data, n );
 613         RM(n);
 614
 615         EnsureUTF8( psz );
 616
 617 #define IF_EXTRACT(txt,var) \
 618     if( !strncasecmp(psz, txt, strlen(txt)) ) \
 619     { \
 620         const char *oldval = vlc_meta_Get( p_sys->p_meta, vlc_meta_ ## var ); \
 621         if( oldval ) \
 622         { \
 623             char * newval; \
 624             if( asprintf( &newval, "%s,%s", oldval, &psz[strlen(txt)] ) == -1 ) \
 625                 newval = NULL; \
 626             vlc_meta_Set( p_sys->p_meta, vlc_meta_ ## var, newval ); \
 627             free( newval ); \
 628         } \
 629         else \
 630             vlc_meta_Set( p_sys->p_meta, vlc_meta_ ## var, &psz[strlen(txt)] ); \
 631     }
 632         IF_EXTRACT("TITLE=", Title )
 633         else IF_EXTRACT("ALBUM=", Album )
 634         else IF_EXTRACT("TRACKNUMBER=", TrackNumber )
 635         else IF_EXTRACT("ARTIST=", Artist )
 636         else IF_EXTRACT("COPYRIGHT=", Copyright )
 637         else IF_EXTRACT("DESCRIPTION=", Description )
 638         else IF_EXTRACT("GENRE=", Genre )
 639         else IF_EXTRACT("DATE=", Date )
 640         else if( strchr( psz, '=' ) )
 641         {
 642             /* generic (PERFORMER/LICENSE/ORGANIZATION/LOCATION/CONTACT/ISRC,
 643              * undocumented tags and replay gain ) */
 644             char *p = strchr( psz, '=' );
 645             *p++ = '\0';
 646             vlc_meta_AddExtra( p_sys->p_meta, psz, p );
 647         }
 648 #undef IF_EXTRACT
 649         free( psz );
 650     }
 651 #undef RM
 652 }
 653
 654 static void ParsePicture( demux_t *p_demux, const uint8_t *p_data, int i_data )
 655 {
 656     static const int pi_cover_score[] = {
 657         0,      /* other */
 658         2, 1,   /* icons */
 659         10,     /* front cover */
 660         9,      /* back cover */
 661         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 662         6,      /* movie/video screen capture */
 663         0,
 664         7,      /* Illustration */
 665         8,      /* Band/Artist logotype */
 666         0,      /* Publisher/Studio */
 667     };
 668     demux_sys_t *p_sys = p_demux->p_sys;
 669     int i_type;
 670     int i_len;
 671     char *psz_mime = NULL;
 672     char *psz_description = NULL;
 673     input_attachment_t *p_attachment;
 674     char psz_name[128];
 675
 676     if( i_data < 4 + 3*4 )
 677         return;
 678 #define RM(x) do { i_data -= (x); p_data += (x); } while(0)
 679     RM(4);
 680
 681     i_type = GetDWBE( p_data ); RM(4);
 682     i_len = GetDWBE( p_data ); RM(4);
 683     if( i_len < 0 || i_data < i_len + 4 )
 684         goto error;
 685     psz_mime = strndup( (const char*)p_data, i_len ); RM(i_len);
 686     i_len = GetDWBE( p_data ); RM(4);
 687     if( i_len < 0 || i_data < i_len + 4*4 + 4)
 688         goto error;
 689     psz_description = strndup( (const char*)p_data, i_len ); RM(i_len);
 690     EnsureUTF8( psz_description );
 691     RM(4*4);
 692     i_len = GetDWBE( p_data ); RM(4);
 693     if( i_len < 0 || i_len > i_data )
 694         goto error;
 695
 696     msg_Dbg( p_demux, "FLAC: Picture type=%d mime=%s description='%s' file length=%d",
 697              i_type, psz_mime, psz_description, i_len );
 698
 699     snprintf( psz_name, sizeof(psz_name), "picture%d", p_sys->i_attachments );
 700     if( !strcasecmp( psz_mime, "image/jpeg" ) )
 701         strcat( psz_name, ".jpg" );
 702     else if( !strcasecmp( psz_mime, "image/png" ) )
 703         strcat( psz_name, ".png" );
 704
 705     p_attachment = vlc_input_attachment_New( psz_name, psz_mime, psz_description,
 706                                              p_data, i_data );
 707     TAB_APPEND( p_sys->i_attachments, p_sys->attachments, p_attachment );
 708
 709     if( i_type >= 0 && (unsigned int)i_type < sizeof(pi_cover_score)/sizeof(pi_cover_score[0]) &&
 710         p_sys->i_cover_score < pi_cover_score[i_type] )
 711     {
 712         p_sys->i_cover_idx = p_sys->i_attachments-1;
 713         p_sys->i_cover_score = pi_cover_score[i_type];
 714     }
 715 error:
 716     free( psz_mime );
 717     free( psz_description );
 718 }
 719 #undef RM
 720