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gus.cpp : Calculated GF1 sample rate

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This commit is contained in:
cam900 2020-02-13 19:49:18 +09:00
parent def2bf867c
commit 7a8fcae1d3
2 changed files with 10 additions and 12 deletions
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21
src/devices/bus/isa/gus.cpp
View File

@ -33,14 +33,6 @@
//#define SAVE_WAVE_RAM 1
//#define LOG_SOUND 1
static const uint16_t rate_table[33] =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
44100, 41160, 38587, 36317, 34300, 32494, 30870, 29400,
28063, 26843, 25725, 24696, 23746, 22866, 22050, 21289,
20580, 19916, 19293
};
static const uint16_t volume_ramp_table[4] =
{
1, 8, 64, 512
@ -411,7 +403,7 @@ void gf1_device::device_start()
m_wave_ram.resize(1024*1024);
memset(&m_wave_ram[0], 0, 1024*1024);
m_stream = stream_alloc(0,2,44100);
m_stream = stream_alloc(0,2,clock() / (14 * 16));
// init timers
m_timer1 = timer_alloc(ADLIB_TIMER1);
@ -458,7 +450,7 @@ void gf1_device::device_reset()
m_irq_source = 0xe0;
m_reg_ctrl = 0;
m_active_voices = 14;
m_stream->set_sample_rate(44100);
m_stream->set_sample_rate(clock() / (m_active_voices * 16));
m_voltimer->adjust(attotime::zero,0,attotime::from_usec(1000/(1.6*m_active_voices)));
}
@ -474,6 +466,11 @@ void gf1_device::device_stop()
fclose(f);
#endif
}
void gf1_device::device_clock_changed()
{
m_stream->set_sample_rate(clock() / (m_active_voices * 16));
}
// ------------------------------------------------
// device I/O handlers
// ------------------------------------------------
@ -743,10 +740,10 @@ WRITE8_MEMBER(gf1_device::global_reg_data_w)
m_active_voices = 14;
if(m_active_voices > 32)
m_active_voices = 32;
m_stream->set_sample_rate(rate_table[m_active_voices]);
m_stream->set_sample_rate(clock() / (m_active_voices * 16));
m_voltimer->adjust(attotime::zero,0,attotime::from_usec(1000/(1.6*m_active_voices)));
}
logerror("GUS: Active Voices write %02x (%d voices at %u Hz)\n", data, m_active_voices, rate_table[m_active_voices]);
logerror("GUS: Active Voices write %02x (%d voices at %u Hz)\n", data, m_active_voices, clock() / (m_active_voices * 16));
break;
case 0x41:
/* bit 0 - Enable the DMA channel.

1
src/devices/bus/isa/gus.h
View File

@ -155,6 +155,7 @@ protected:
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_stop() override;
virtual void device_clock_changed() override;
virtual void update_irq() override;