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Diffstat (limited to 'src/devices/sound/dmadac.cpp')
-rw-r--r--src/devices/sound/dmadac.cpp61
1 files changed, 43 insertions, 18 deletions
diff --git a/src/devices/sound/dmadac.cpp b/src/devices/sound/dmadac.cpp
index 59fe5b15546..b3a7d84bbf5 100644
--- a/src/devices/sound/dmadac.cpp
+++ b/src/devices/sound/dmadac.cpp
@@ -21,7 +21,7 @@
*
*************************************/
-#define DEFAULT_SAMPLE_RATE (44100)
+#define DEFAULT_SAMPLE_RATE (48000)
#define BUFFER_SIZE 32768
@@ -38,14 +38,11 @@
void dmadac_sound_device::device_start()
{
- /* allocate a clear a buffer */
- m_buffer = make_unique_clear<int16_t[]>(BUFFER_SIZE);
-
/* reset the state */
- m_volume = 0x100;
+ m_volume = 1.0;
/* allocate a stream channel */
- m_channel = machine().sound().stream_alloc(*this, 0, 1, DEFAULT_SAMPLE_RATE);
+ m_channel = stream_alloc(0, 1, DEFAULT_SAMPLE_RATE);
/* register with the save state system */
save_item(NAME(m_bufin));
@@ -53,7 +50,7 @@ void dmadac_sound_device::device_start()
save_item(NAME(m_volume));
save_item(NAME(m_enabled));
save_item(NAME(m_frequency));
- save_pointer(NAME(m_buffer), BUFFER_SIZE);
+ save_item(NAME(m_buffer));
}
@@ -91,6 +88,7 @@ void dmadac_sound_device::transfer(int channel, offs_t channel_spacing, offs_t f
int j;
/* loop over all channels and accumulate the data */
+ constexpr stream_buffer::sample_t sample_scale = 1.0 / 32768.0;
if (m_enabled)
{
int maxin = (m_bufout + BUFFER_SIZE - 1) % BUFFER_SIZE;
@@ -100,6 +98,35 @@ void dmadac_sound_device::transfer(int channel, offs_t channel_spacing, offs_t f
/* copy the data */
for (j = 0; j < total_frames && curin != maxin; j++)
{
+ m_buffer[curin] = stream_buffer::sample_t(*src) * sample_scale;
+ curin = (curin + 1) % BUFFER_SIZE;
+ src += frame_spacing;
+ }
+ m_bufin = curin;
+
+ /* log overruns */
+ if (j != total_frames)
+ logerror("dmadac_transfer: buffer overrun (short %d frames)\n", total_frames - j);
+ }
+
+ // FIXME: this line has rotted and can no longer compile - it should be fixed and uncommented or removed
+ //LOG("dmadac_transfer - %d samples, %d effective, %d in buffer\n", total_frames, int(total_frames * double(DEFAULT_SAMPLE_RATE) / dmadac[first_channel].frequency), dmadac[first_channel].curinpos - dmadac[first_channel].curoutpos);
+}
+
+void dmadac_sound_device::transfer(int channel, offs_t channel_spacing, offs_t frame_spacing, offs_t total_frames, stream_buffer::sample_t *data)
+{
+ int j;
+
+ /* loop over all channels and accumulate the data */
+ if (m_enabled)
+ {
+ int maxin = (m_bufout + BUFFER_SIZE - 1) % BUFFER_SIZE;
+ stream_buffer::sample_t *src = data + channel * channel_spacing;
+ int curin = m_bufin;
+
+ /* copy the data */
+ for (j = 0; j < total_frames && curin != maxin; j++)
+ {
m_buffer[curin] = *src;
curin = (curin + 1) % BUFFER_SIZE;
src += frame_spacing;
@@ -187,7 +214,7 @@ void dmadac_set_volume(dmadac_sound_device **devlist, uint8_t num_channels, uint
void dmadac_sound_device::set_volume(uint16_t volume)
{
m_channel->update();
- m_volume = volume;
+ m_volume = stream_buffer::sample_t(volume) * (1.0 / 256.0);
}
DEFINE_DEVICE_TYPE(DMADAC, dmadac_sound_device, "dmadac", "DMA-driven DAC")
@@ -195,7 +222,7 @@ DEFINE_DEVICE_TYPE(DMADAC, dmadac_sound_device, "dmadac", "DMA-driven DAC")
dmadac_sound_device::dmadac_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, DMADAC, tag, owner, clock),
device_sound_interface(mconfig, *this),
- m_buffer(nullptr),
+ m_buffer(BUFFER_SIZE),
m_bufin(0),
m_bufout(0),
m_volume(0),
@@ -205,27 +232,25 @@ dmadac_sound_device::dmadac_sound_device(const machine_config &mconfig, const ch
}
//-------------------------------------------------
-// sound_stream_update - handle a stream update
+// sound_stream_update_legacy - handle a stream update
//-------------------------------------------------
-void dmadac_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
+void dmadac_sound_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
- stream_sample_t *output = outputs[0];
- int16_t *source = m_buffer.get();
+ auto &output = outputs[0];
uint32_t curout = m_bufout;
uint32_t curin = m_bufin;
- int volume = m_volume;
/* feed as much as we can */
- while (curout != curin && samples-- > 0)
+ int sampindex;
+ for (sampindex = 0; curout != curin && sampindex < output.samples(); sampindex++)
{
- *output++ = (source[curout] * volume) >> 8;
+ output.put(sampindex, stream_buffer::sample_t(m_buffer[curout]) * m_volume);
curout = (curout + 1) % BUFFER_SIZE;
}
/* fill the rest with silence */
- while (samples-- > 0)
- *output++ = 0;
+ output.fill(0, sampindex);
/* save the new output pointer */
m_bufout = curout;