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author Aaron Giles <aaron@aarongiles.com>2020-09-17 13:45:13 -0700
committer Aaron Giles <aaron@aarongiles.com>2020-09-17 13:45:13 -0700
commitaba8c220e89e5563c21aac3548a810adcdbfb71b (patch)
treee8d8408fbfe3fa93ca24642ab689fb2f3ea2cd88 /src/emu/disound.cpp
parentec742d3eda78e2fefd01b69a9f10ae1939422d16 (diff)
sound: Some optimizations for common cases
* Reuse resamplers if routing the same output to multiple targets at the same rate * Avoid copying when there's only one stream going through a mixer
Diffstat (limited to 'src/emu/disound.cpp')
-rw-r--r--src/emu/disound.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/emu/disound.cpp b/src/emu/disound.cpp
index 29d8b4e13b5..d2c063ff205 100644
--- a/src/emu/disound.cpp
+++ b/src/emu/disound.cpp
@@ -497,6 +497,13 @@ void device_mixer_interface::interface_post_load()
void device_mixer_interface::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
+ // special case: single input, single output, same rate
+ if (inputs.size() == 1 && outputs.size() == 1 && inputs[0].sample_rate() == outputs[0].sample_rate())
+ {
+ outputs[0] = inputs[0];
+ return;
+ }
+
// reset the clear flags
std::fill(std::begin(m_output_clear), std::end(m_output_clear), false);