modules/access/bd/clpi.c

   1 /*****************************************************************************
   2  * clpi.c: BluRay Disc CLPI
   3  *****************************************************************************
   4  * Copyright (C) 2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27 #include <limits.h>
  28
  29 #include <vlc_common.h>
  30 #include <vlc_bits.h>
  31 #include "clpi.h"
  32
  33 /* */
  34 void bd_clpi_stc_Parse( bd_clpi_stc_t *p_stc, bs_t *s )
  35 {
  36     p_stc->i_pcr_pid = bs_read( s, 16 );
  37     p_stc->i_packet = bs_read( s, 32 );
  38     p_stc->i_start = bs_read( s, 32 );
  39     p_stc->i_end = bs_read( s, 32 );
  40 }
  41
  42 void bd_clpi_stream_Parse( bd_clpi_stream_t *p_stream, bs_t *s )
  43 {
  44     p_stream->i_pid = bs_read( s, 16 );
  45
  46     const int i_length = bs_read( s, 8 );
  47
  48     p_stream->i_type = bs_read( s, 8 );
  49
  50     /* Ignore the rest */
  51     if( i_length > 1 )
  52         bs_skip( s, 8*i_length - 8 );
  53 }
  54
  55 void bd_clpi_ep_map_Clean( bd_clpi_ep_map_t *p_ep_map )
  56 {
  57     free( p_ep_map->p_ep );
  58 }
  59 int bd_clpi_ep_map_Parse( bd_clpi_ep_map_t *p_ep_map,
  60                           bs_t *s, const int i_ep_map_start )
  61 {
  62     p_ep_map->i_pid = bs_read( s, 16 );
  63     bs_skip( s, 10 );
  64     p_ep_map->i_type = bs_read( s, 4 );
  65
  66     const int i_coarse = bs_read( s, 16 );
  67     const int i_fine = bs_read( s, 18 );
  68     const uint32_t i_coarse_start = bs_read( s, 32 );
  69
  70     p_ep_map->i_ep = i_fine;
  71     p_ep_map->p_ep = calloc( i_fine, sizeof(*p_ep_map->p_ep) );
  72     if( !p_ep_map->p_ep )
  73         return VLC_EGENERIC;
  74
  75     bs_t cs = *s;
  76     bs_skip( &cs, 8*(i_ep_map_start + i_coarse_start) - bs_pos( s ) );
  77
  78     const uint32_t i_fine_start = bs_read( &cs, 32 );
  79
  80     for( int i = 0; i < i_coarse; i++ )
  81     {
  82         const int      i_fine_id = bs_read( &cs, 18 );
  83         const int      i_pts = bs_read( &cs, 14 );
  84         const uint32_t i_packet = bs_read( &cs, 32 );
  85
  86         for( int j = i_fine_id; j < p_ep_map->i_ep; j++ )
  87         {
  88             p_ep_map->p_ep[j].i_pts = (int64_t)(i_pts & ~1) << 19;
  89             p_ep_map->p_ep[j].i_packet = i_packet & ~( (1 << 17) - 1 );
  90         }
  91     }
  92
  93     bs_t fs = *s;
  94     bs_skip( &fs, 8*(i_ep_map_start + i_coarse_start + i_fine_start) - bs_pos( s ) );
  95     for( int i = 0; i < i_fine; i++ )
  96     {
  97         const bool b_angle_point = bs_read( &fs, 1 );
  98         bs_skip( &fs, 3 );  /* I end position offset */
  99         const int i_pts = bs_read( &fs, 11 );
 100         const int i_packet = bs_read( &fs, 17 );
 101
 102         p_ep_map->p_ep[i].b_angle_point = b_angle_point;
 103         p_ep_map->p_ep[i].i_pts |= i_pts << 9;
 104         p_ep_map->p_ep[i].i_packet |= i_packet;
 105     }
 106     return VLC_SUCCESS;
 107 }
 108
 109 void bd_clpi_Clean( bd_clpi_t *p_clpi )
 110 {
 111     free( p_clpi->p_stc );
 112
 113     free( p_clpi->p_stream );
 114
 115     for( int i = 0; i < p_clpi->i_ep_map; i++ )
 116         bd_clpi_ep_map_Clean( &p_clpi->p_ep_map[i] );
 117     free( p_clpi->p_ep_map );
 118 }
 119
 120 int bd_clpi_Parse( bd_clpi_t *p_clpi, bs_t *s, int i_id )
 121 {
 122     const int i_start = bs_pos( s ) / 8;
 123
 124     /* */
 125     if( bs_read( s, 32 ) != 0x48444D56 )
 126         return VLC_EGENERIC;
 127     const uint32_t i_version = bs_read( s, 32 );
 128     if( i_version != 0x30313030 && i_version != 0x30323030 )
 129         return VLC_EGENERIC;
 130
 131     /* */
 132     const uint32_t i_sequence_start = bs_read( s, 32 );
 133     const uint32_t i_program_start = bs_read( s, 32 );
 134     const uint32_t i_cpi_start = bs_read( s, 32 );
 135     bs_skip( s, 32 );   /* mark start */
 136     bs_skip( s, 32 );   /* extension start */
 137
 138     /* */
 139     p_clpi->i_id = i_id;
 140
 141     /* Read sequence */
 142     bs_t ss = *s;
 143     bs_skip( &ss, 8 * ( i_start + i_sequence_start ) - bs_pos( s ) );
 144     bs_skip( &ss, 32 ); /* Length */
 145     bs_skip( &ss, 8 );
 146     bs_skip( &ss, 8 );  /* ATC sequence count (MUST be 1 ?) */
 147     bs_skip( &ss, 32 ); /* ATC start (MUST be 0) */
 148     const int i_stc = bs_read( &ss, 8 );
 149     bs_skip( &ss, 8 );  /* STC ID offset (MUST be 0 ? */
 150
 151     p_clpi->p_stc = calloc( i_stc, sizeof(*p_clpi->p_stc) );
 152     for( p_clpi->i_stc = 0; p_clpi->i_stc < i_stc; p_clpi->i_stc++ )
 153     {
 154         if( !p_clpi->p_stc )
 155             break;
 156         bd_clpi_stc_Parse( &p_clpi->p_stc[p_clpi->i_stc], &ss );
 157     }
 158
 159     /* Program */
 160     bs_t ps = *s;
 161     bs_skip( &ps, 8 * ( i_start + i_program_start ) - bs_pos( s ) );
 162     bs_skip( &ps, 32 ); /* Length */
 163     bs_skip( &ps, 8 );
 164     bs_skip( &ps, 8 );  /* Program count (MUST be 1 ?) */
 165     bs_skip( &ps, 32 ); /* Program sequence start (MUST be 0) */
 166     p_clpi->i_pmt_pid = bs_read( &ps, 16 );
 167     const int i_stream = bs_read( &ps, 8 );
 168     bs_skip( &ps, 8 );  /* Group count (MUST be 1 ?) */
 169
 170     p_clpi->p_stream = calloc( i_stream, sizeof(*p_clpi->p_stream) );
 171     for( p_clpi->i_stream = 0; p_clpi->i_stream < i_stream; p_clpi->i_stream++ )
 172     {
 173         if( !p_clpi->p_stream )
 174             break;
 175         bd_clpi_stream_Parse( &p_clpi->p_stream[p_clpi->i_stream], &ps );
 176     }
 177
 178     /* Read CPI */
 179     bs_t cs = *s;
 180     bs_skip( &cs, 8 * ( i_start + i_cpi_start ) - bs_pos( s ) );
 181
 182     const uint32_t i_cpi_length = bs_read( &cs, 32 );
 183     if( i_cpi_length > 0 )
 184     {
 185         bs_skip( &cs, 12 );
 186         bs_skip( &cs, 4 );  /* Type (MUST be 1) */
 187
 188         /* EPMap */
 189         const int i_epmap_start = bs_pos( &cs ) / 8;
 190         bs_skip( &cs, 8 );
 191         const int i_ep_map = bs_read( &cs, 8 );
 192
 193         p_clpi->p_ep_map = calloc( i_ep_map, sizeof(*p_clpi->p_ep_map) );
 194         for( p_clpi->i_ep_map = 0; p_clpi->i_ep_map < i_ep_map; p_clpi->i_ep_map++ )
 195         {
 196             if( !p_clpi->p_ep_map )
 197                 break;
 198
 199             if( bd_clpi_ep_map_Parse( &p_clpi->p_ep_map[p_clpi->i_ep_map],
 200                                       &cs, i_epmap_start ) )
 201                 break;
 202         }
 203     }
 204     else
 205     {
 206         p_clpi->i_ep_map = 0;
 207         p_clpi->p_ep_map = NULL;
 208     }
 209     return VLC_SUCCESS;
 210 }