static libspectrum_error
turbo_edge( libspectrum_tape_turbo_block *block, libspectrum_dword *tstates,
int *end_of_block )
{
int error;
switch( block->state ) {
case LIBSPECTRUM_TAPE_STATE_PILOT:
/* The next edge occurs in one pilot edge timing */
*tstates = block->pilot_length;
/* If that was the last pilot edge, change state */
if( --(block->edge_count) == 0 )
block->state = LIBSPECTRUM_TAPE_STATE_SYNC1;
break;
case LIBSPECTRUM_TAPE_STATE_SYNC1:
/* The first short sync pulse */
*tstates = block->sync1_length;
/* Followed by the second sync pulse */
block->state = LIBSPECTRUM_TAPE_STATE_SYNC2;
break;
case LIBSPECTRUM_TAPE_STATE_SYNC2:
/* The second short sync pulse */
*tstates = block->sync2_length;
/* Followed by the first bit of data */
error = turbo_next_bit( block ); if( error ) return error;
break;
case LIBSPECTRUM_TAPE_STATE_DATA1:
/* The first edge for a bit of data */
*tstates = block->bit_tstates;
/* Followed by the second edge */
block->state = LIBSPECTRUM_TAPE_STATE_DATA2;
break;
case LIBSPECTRUM_TAPE_STATE_DATA2:
/* The second edge for a bit of data */
*tstates = block->bit_tstates;
/* Followed by the next bit of data (or the end of data) */
error = turbo_next_bit( block ); if( error ) return error;
break;
case LIBSPECTRUM_TAPE_STATE_PAUSE:
/* The pause at the end of the block */
*tstates = (block->pause * 69888)/20; /* FIXME: should vary with tstates
per frame */
*end_of_block = 1;
break;
default:
libspectrum_print_error( "turbo_edge: unknown state %d\n", block->state );
return LIBSPECTRUM_ERROR_LOGIC;
}
return LIBSPECTRUM_ERROR_NONE;
}
static libspectrum_error
turbo_edge( libspectrum_tape_turbo_block *block,
libspectrum_tape_turbo_block_state *state,
libspectrum_dword *tstates, int *end_of_block )
{
int error;
switch( state->state ) {
case LIBSPECTRUM_TAPE_STATE_PILOT:
/* Check we actually have some edges */
if( state->edge_count-- != 0 ) {
*tstates = block->pilot_length;
break;
}
/* Fall through */
case LIBSPECTRUM_TAPE_STATE_SYNC1:
/* The first short sync pulse */
*tstates = block->sync1_length;
/* Followed by the second sync pulse */
state->state = LIBSPECTRUM_TAPE_STATE_SYNC2;
break;
case LIBSPECTRUM_TAPE_STATE_SYNC2:
/* The second short sync pulse */
*tstates = block->sync2_length;
/* Followed by the first bit of data */
error = turbo_next_bit( block, state ); if( error ) return error;
break;
case LIBSPECTRUM_TAPE_STATE_DATA1:
/* The first edge for a bit of data */
*tstates = state->bit_tstates;
/* Followed by the second edge */
state->state = LIBSPECTRUM_TAPE_STATE_DATA2;
break;
case LIBSPECTRUM_TAPE_STATE_DATA2:
/* The second edge for a bit of data */
*tstates = state->bit_tstates;
/* Followed by the next bit of data (or the end of data) */
error = turbo_next_bit( block, state ); if( error ) return error;
break;
case LIBSPECTRUM_TAPE_STATE_PAUSE:
/* The pause at the end of the block */
*tstates = (block->pause * 69888)/20; /* FIXME: should vary with tstates
per frame */
*end_of_block = 1;
break;
default:
libspectrum_print_error( LIBSPECTRUM_ERROR_LOGIC,
"turbo_edge: unknown state %d", state->state );
return LIBSPECTRUM_ERROR_LOGIC;
}
return LIBSPECTRUM_ERROR_NONE;
}
