int tms5220_cycles_to_ready(void)
{
int answer;
if (tms5220_ready_read())
answer = 0;
else
{
int val;
answer = 200-sample_count+1;
/* total number of bits available in current byte is (8 - fifo_bits_taken) */
/* if more than 4 are available, we need to check the energy */
if (fifo_bits_taken < 4)
{
/* read energy */
val = (fifo[fifo_head] >> fifo_bits_taken) & 0xf;
if (val == 0)
/* 0 -> silence frame: we will only read 4 bits, and we will
therefore need to read another frame before the FIFO is not
full any more */
answer += 200;
/* 15 -> stop frame, we will only read 4 bits, but the FIFO will
we cleared */
/* otherwise, we need to parse the repeat flag (1 bit) and the
pitch (6 bits), so everything will be OK. */
}
}
int tms5220_ready_r(void)
{
/* bring up to date first */
#ifndef MAME_FASTSOUND
stream_update(stream, -1);
#else
{
extern int fast_sound;
if (!fast_sound) stream_update(stream, -1);
}
#endif
return tms5220_ready_read();
}