/***************************************************************************** * EntryPoints: Reads the information about the entry points on the disc. *****************************************************************************/ static int EntryPoints( access_t *p_access ) { access_sys_t *p_sys = p_access->p_sys; uint8_t sector[VCD_DATA_SIZE]; entries_sect_t entries; int i_nb; /* Read the entry point sector */ if( ioctl_ReadSectors( VLC_OBJECT(p_access), p_sys->vcddev, VCD_ENTRIES_SECTOR, sector, 1, VCD_TYPE ) < 0 ) { msg_Err( p_access, "could not read entry points sector" ); return VLC_EGENERIC; } memcpy( &entries, sector, CD_SECTOR_SIZE ); i_nb = GetWBE( &entries.i_entries_nb ); if( i_nb > 500 ) { msg_Err( p_access, "invalid entry points number" ); return VLC_EGENERIC; } if( strncmp( entries.psz_id, "ENTRYVCD", sizeof( entries.psz_id ) ) && strncmp( entries.psz_id, "ENTRYSVD", sizeof( entries.psz_id ) ) ) { msg_Err( p_access, "unrecognized entry points format" ); return VLC_EGENERIC; } for( int i = 0; i < i_nb; i++ ) { const int i_title = BCD_TO_BIN(entries.entry[i].i_track) - 2; const int i_sector = (MSF_TO_LBA2( BCD_TO_BIN( entries.entry[i].msf.minute ), BCD_TO_BIN( entries.entry[i].msf.second ), BCD_TO_BIN( entries.entry[i].msf.frame ) )); seekpoint_t *s; if( i_title < 0 ) continue; /* Should not occur */ if( i_title >= p_sys->i_titles ) continue; msg_Dbg( p_access, "Entry[%d] title=%d sector=%d", i, i_title, i_sector ); s = vlc_seekpoint_New(); s->i_byte_offset = (i_sector - p_sys->p_sectors[i_title+1]) * VCD_DATA_SIZE; TAB_APPEND( p_sys->title[i_title]->i_seekpoint, p_sys->title[i_title]->seekpoint, s ); } return VLC_SUCCESS; }
/***************************************************************************** * Block: read data (CDDA_DATA_ONCE) *****************************************************************************/ static block_t *Block( access_t *p_access ) { access_sys_t *p_sys = p_access->p_sys; int i_blocks = CDDA_BLOCKS_ONCE; block_t *p_block; if( p_sys->i_track < 0 ) p_access->info.b_eof = true; /* Check end of file */ if( p_access->info.b_eof ) return NULL; if( !p_sys->b_header ) { /* Return only the header */ p_block = block_Alloc( sizeof( WAVEHEADER ) ); memcpy( p_block->p_buffer, &p_sys->waveheader, sizeof(WAVEHEADER) ); p_sys->b_header = true; return p_block; } if( p_sys->i_sector >= p_sys->i_last_sector ) { p_access->info.b_eof = true; return NULL; } /* Don't read too far */ if( p_sys->i_sector + i_blocks >= p_sys->i_last_sector ) i_blocks = p_sys->i_last_sector - p_sys->i_sector; /* Do the actual reading */ if( !( p_block = block_Alloc( i_blocks * CDDA_DATA_SIZE ) ) ) { msg_Err( p_access, "cannot get a new block of size: %i", i_blocks * CDDA_DATA_SIZE ); return NULL; } if( ioctl_ReadSectors( VLC_OBJECT(p_access), p_sys->vcddev, p_sys->i_sector, p_block->p_buffer, i_blocks, CDDA_TYPE ) < 0 ) { msg_Err( p_access, "cannot read sector %i", p_sys->i_sector ); block_Release( p_block ); /* Try to skip one sector (in case of bad sectors) */ p_sys->i_sector++; p_access->info.i_pos += CDDA_DATA_SIZE; return NULL; } /* Update a few values */ p_sys->i_sector += i_blocks; p_access->info.i_pos += p_block->i_buffer; return p_block; }
/***************************************************************************** * Block: *****************************************************************************/ static block_t *Block( access_t *p_access ) { access_sys_t *p_sys = p_access->p_sys; int i_blocks = VCD_BLOCKS_ONCE; block_t *p_block; /* Check end of file */ if( p_access->info.b_eof ) return NULL; /* Check end of title */ while( p_sys->i_sector >= p_sys->p_sectors[p_access->info.i_title + 2] ) { if( p_access->info.i_title + 2 >= p_sys->i_titles ) { p_access->info.b_eof = true; return NULL; } p_access->info.i_update |= INPUT_UPDATE_TITLE | INPUT_UPDATE_SEEKPOINT | INPUT_UPDATE_SIZE; p_access->info.i_title++; p_access->info.i_seekpoint = 0; p_access->info.i_size = p_sys->title[p_access->info.i_title]->i_size; p_access->info.i_pos = 0; } /* Don't read after the end of a title */ if( p_sys->i_sector + i_blocks >= p_sys->p_sectors[p_access->info.i_title + 2] ) { i_blocks = p_sys->p_sectors[p_access->info.i_title + 2 ] - p_sys->i_sector; } /* Do the actual reading */ if( i_blocks < 0 || !( p_block = block_Alloc( i_blocks * VCD_DATA_SIZE ) ) ) { msg_Err( p_access, "cannot get a new block of size: %i", i_blocks * VCD_DATA_SIZE ); return NULL; } if( ioctl_ReadSectors( VLC_OBJECT(p_access), p_sys->vcddev, p_sys->i_sector, p_block->p_buffer, i_blocks, VCD_TYPE ) < 0 ) { msg_Err( p_access, "cannot read sector %i", p_sys->i_sector ); block_Release( p_block ); /* Try to skip one sector (in case of bad sectors) */ p_sys->i_sector++; p_access->info.i_pos += VCD_DATA_SIZE; return NULL; } /* Update seekpoints */ for( int i_read = 0; i_read < i_blocks; i_read++ ) { input_title_t *t = p_sys->title[p_access->info.i_title]; if( t->i_seekpoint > 0 && p_access->info.i_seekpoint + 1 < t->i_seekpoint && (int64_t) /* Unlikely to go over 8192 PetaB */ (p_access->info.i_pos + i_read * VCD_DATA_SIZE) >= t->seekpoint[p_access->info.i_seekpoint+1]->i_byte_offset ) { msg_Dbg( p_access, "seekpoint change" ); p_access->info.i_update |= INPUT_UPDATE_SEEKPOINT; p_access->info.i_seekpoint++; } } /* Update a few values */ p_sys->i_sector += i_blocks; p_access->info.i_pos += p_block->i_buffer; return p_block; }