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-rw-r--r--src/emu/disound.cpp62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/emu/disound.cpp b/src/emu/disound.cpp
index 9d0b93f70bc..7d2929a0c77 100644
--- a/src/emu/disound.cpp
+++ b/src/emu/disound.cpp
@@ -73,6 +73,40 @@ void device_sound_interface::static_reset_routes(device_t &device)
//-------------------------------------------------
+// static_add_reference_input - configuration
+// helper to add a new fixed reference input
+//-------------------------------------------------
+
+void device_sound_interface::static_add_reference_input(device_t &device, u32 input, double level)
+{
+ // find our sound interface
+ device_sound_interface *sound;
+ if (!device.interface(sound))
+ throw emu_fatalerror("MCFG_SOUND_REFERENCE_INPUT called on device '%s' with no sound interface", device.tag());
+
+ // append a new reference input to the list
+ sound->m_ref_list.push_back(std::make_unique<sound_reference_input>(input, level));
+}
+
+
+//-------------------------------------------------
+// static_reset_reference_inputs - configuration
+// helper to remove all fixed reference inputs
+//-------------------------------------------------
+
+void device_sound_interface::static_reset_reference_inputs(device_t &device)
+{
+ // find our sound interface
+ device_sound_interface *sound;
+ if (!device.interface(sound))
+ throw emu_fatalerror("MCFG_SOUND_REFERENCE_INPUTS_RESET called on device '%s' with no sound interface", device.tag());
+
+ // reset the reference input list
+ sound->m_ref_list.clear();
+}
+
+
+//-------------------------------------------------
// stream_alloc - allocate a stream implicitly
// associated with this device
//-------------------------------------------------
@@ -298,6 +332,19 @@ void device_sound_interface::interface_pre_start()
void device_sound_interface::interface_post_start()
{
+ // iterate over reference inputs
+ for (auto &ref : refs())
+ {
+ // find the input stream to connect to
+ int streaminputnum;
+ sound_stream *inputstream = input_to_stream_input(ref->m_input, streaminputnum);
+ if (inputstream == nullptr)
+ fatalerror("Sound device '%s' fixes non-existant input %d\n", device().tag(), ref->m_input);
+
+ // set the reference input
+ inputstream->set_input(streaminputnum, nullptr, 0, 1.0, stream_sample_t(ref->m_level * 32768));
+ }
+
// iterate over all the sound devices
for (device_sound_interface &sound : sound_interface_iterator(m_device.machine().root_device()))
{
@@ -370,6 +417,21 @@ device_sound_interface::sound_route::sound_route(int output, int input, float ga
//**************************************************************************
+// FIXED REFERENCE INPUTS
+//**************************************************************************
+
+//-------------------------------------------------
+// sound_reference_input - constructor
+//-------------------------------------------------
+
+device_sound_interface::sound_reference_input::sound_reference_input(u32 input, double level)
+ : m_input(input),
+ m_level(level)
+{
+}
+
+
+//**************************************************************************
// SIMPLE DERIVED MIXER INTERFACE
//**************************************************************************