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sound: change audio_latency meaning similar to what it was before (20ms steps for portaudio, xaudio2, wasapi), old mame.ini default setting of 2 should work fine

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hap 2025-05-31 17:04:19 +02:00
parent d2bfb8c3f4
commit 01cdde101f
6 changed files with 17 additions and 14 deletions
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6
docs/man/mame.6
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@ -948,11 +948,11 @@ Sets the startup volume. It can later be changed with the user interface
.\" +++++++++++++++++++++++++++++++++++++++++++++++++++++++
.TP
.B \-audio_latency, \-alat \fIvalue
This controls the amount of latency in seconds built into the audio streaming.
This controls the amount of latency built into the audio streaming.
Smaller values provide less audio delay while requiring better system
performance. Higher values increase audio delay but may help avoid
buffer under-runs and audio interruptions. The default is 0.0 and will pick
a sane duration.
buffer under-runs and audio interruptions. The default is 0 and will
pick a sane duration.
.\"
.\" *******************************************************
.SS Input options

15
docs/source/commandline/commandline-all.rst
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@ -3065,22 +3065,23 @@ Core Sound Options
**-audio_latency** *<value>* / **-alat** *<value>*
Audio latency in seconds, up to a maximum of 0.5 seconds. Smaller values
provide less audio delay while requiring better system performance. Larger
values increase audio delay but may help avoid buffer under-runs and audio
interruptions. A value of 0.0 will use the default for the selected sound
module.
Audio latency, conventionally in number of audio frames (1 audio frame is 20ms).
It is not required to supply whole numbers, eg. a value of ``1.5`` is 30ms).
Smaller values provide less audio delay while requiring better system
performance. Larger values increase audio delay but may help avoid buffer
under-runs and audio interruptions. A value of ``0`` will use the default
for the selected sound module.
You may need to change the value of this option if you change the sound module
using the :ref:`sound option <mame-commandline-sound>`. This option is
unsupported on sound modules ``pipewire``, ``pulse``, ``sdl``.
The default is ``0.0``.
The default is ``0``.
Example:
.. code-block:: bash
mame galaga -audio_latency 0.1
mame galaga -audio_latency 2
.. _mame-commandline-inputoptions:

2
src/osd/modules/lib/osdobj_common.cpp
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@ -144,7 +144,7 @@ const options_entry osd_options::s_option_entries[] =
{ nullptr, nullptr, core_options::option_type::HEADER, "OSD SOUND OPTIONS" },
{ OSDOPTION_SOUND, OSDOPTVAL_AUTO, core_options::option_type::STRING, "sound output method: " },
{ OSDOPTION_AUDIO_LATENCY ";alat(0.0-0.5)", "0.0", core_options::option_type::FLOAT, "audio latency in seconds, 0.0 for default (increase to reduce glitches, decrease for responsiveness)" },
{ OSDOPTION_AUDIO_LATENCY ";alat(0.0-50.0)", "0.0", core_options::option_type::FLOAT, "audio latency, 0 for default (increase to reduce glitches, decrease for responsiveness)" },
#ifdef SDLMAME_MACOSX
{ nullptr, nullptr, core_options::option_type::HEADER, "CoreAudio-SPECIFIC OPTIONS" },

2
src/osd/modules/sound/pa_sound.cpp
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@ -163,7 +163,7 @@ int sound_pa::init(osd_interface &osd, osd_options const &options)
m_info.m_default_source = dc(Pa_GetDefaultInputDevice());
m_stream_id = 1;
m_audio_latency = options.audio_latency();
m_audio_latency = options.audio_latency() / sound_manager::STREAMS_UPDATE_FREQUENCY;
m_machine = &downcast<osd_common_t &>(osd).machine();
return 0;

3
src/osd/modules/sound/wasapi_sound.cpp
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@ -6,6 +6,7 @@
//
//====================================================================
#include "emu.h"
#include "sound_module.h"
#include "modules/osdmodule.h"
@ -499,7 +500,7 @@ int sound_wasapi::init(osd_interface &osd, osd_options const &options)
HRESULT result;
// get relevant options
m_audio_latency = options.audio_latency();
m_audio_latency = options.audio_latency() / sound_manager::STREAMS_UPDATE_FREQUENCY;
if (m_audio_latency == 0.0F)
m_audio_latency = 0.03F;
m_audio_latency = std::clamp(m_audio_latency, 0.01F, 1.0F);

3
src/osd/modules/sound/xaudio2_sound.cpp
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@ -6,6 +6,7 @@
//
//====================================================================
#include "emu.h"
#include "sound_module.h"
#include "modules/osdmodule.h"
@ -387,7 +388,7 @@ int sound_xaudio2::init(osd_interface &osd, osd_options const &options)
}
// get relevant options
m_audio_latency = options.audio_latency();
m_audio_latency = options.audio_latency() / sound_manager::STREAMS_UPDATE_FREQUENCY;
if (m_audio_latency == 0.0F)
m_audio_latency = 0.03F;
m_audio_latency = std::clamp(m_audio_latency, 0.01F, 1.0F);