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(MESS) hr16: fixed unending samples. (nw)

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This commit is contained in:
Sandro Ronco 2012-08-24 19:34:03 +00:00
parent bfec2434fe
commit 0d6ceb18d9
1 changed files with 27 additions and 18 deletions
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45
src/mess/audio/alesis.c
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@ -80,30 +80,39 @@ void alesis_dm3ag_device::device_timer(emu_timer &timer, device_timer_id id, int
if (m_output_active)
{
INT16 sample = m_samples[m_cur_sample++];
int count = 0;
if (sample == -128 && m_shift)
while (sample == -128)
{
/*
The HR-16 seems to use a simple scheme to generate 16-bit samples from its 8-bit sample ROMs.
When the sound starts the 8-bit sample is sent to the most significant bits of the DAC and every
time a -1 sample is found the data is shifted one position to right.
*/
sample = m_samples[m_cur_sample++];
m_shift--;
count++;
if (LOG) logerror("DM3AG '%s' shift: %02x\n", tag(), m_shift);
if (count == 1 && m_shift)
{
/*
The HR-16 seems to use a simple scheme to generate 16-bit samples from its 8-bit sample ROMs.
When the sound starts the 8-bit sample is sent to the most significant bits of the DAC and every
time a -1 sample is found the data is shifted one position to right.
*/
m_shift--;
if (LOG) logerror("DM3AG '%s' shift: %02x\n", tag(), m_shift);
}
// every block ends with three or more -1 samples
if (m_cur_sample == 0xfffff || count >= 3)
{
m_output_active = false;
sample = 0;
if (LOG) logerror("DM3AG '%s' stop: %d, len: %d\n", tag(), m_cur_sample, m_cur_sample-((m_cmd[0]<<12) | (m_cmd[1]<<4) | ((m_cmd[2]>>4) & 0x0f)));
break;
}
sample = m_samples[m_cur_sample++];
}
m_dac->write_signed16((sample << m_shift) + 0x8000);
// every block ends with three or more -1 samples
if (m_cur_sample == 0xfffff || (m_samples[m_cur_sample-1] == -128 && m_samples[m_cur_sample] == -128 && m_samples[m_cur_sample+1] == -128))
{
m_output_active = false;
m_dac->write_signed16(0x8000);
if (LOG) logerror("DM3AG '%s' stop: %d\n", tag(), m_cur_sample-((m_cmd[0]<<12) | (m_cmd[1]<<4) | ((m_cmd[2]>>4) & 0x0f)));
}
}
}