/*****************************************************************************
* 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;
}
