Commit 521e5dc5 authored by Christian Speckner's avatar Christian Speckner
Browse files

Document audio settings, fix units for fragment size, fix audio dialog width.

parent 471cf1ad
......@@ -2657,7 +2657,7 @@
<p><b>TODO! Audio Settings</b> dialog:</p>
<p><b>Audio Settings</b> dialog:</p>
<table border="5" cellpadding="2" frame="box" rules="none">
<td><img src="graphics/options_audio.png"></td>
......@@ -2665,11 +2665,35 @@
<td valign="top">
<table border="1" cellpadding="4">
<tr><th>Item</th><th>Brief description</th><th>For more information,<br>see <a href="#CommandLine">CommandLine</a></th></tr>
<tr><td>Sample size (*)</td><td>Set size of audio buffers</td><td>-fragsize</td></tr>
<tr><td>Frequency (*)</td><td>Change sound output frequency</td><td>-freq</td></tr>
<tr><td>Enable sound</td><td>Self-explanatory</td><td>-sound</td></tr>
<tr><td>Enable audio</td><td>Self-explanatory</td><td>-audio.enabled</td></tr>
<tr><td>Mode</td><td>Select an audio preset or choose 'custom' for manual configuration</td><td>-audio.preset</td></tr>
<tr><td>Fragment size</td><td>The number of samples in a single fragment processed by the audio driver. Smaller values mean less latency, but may lead to dropouts (depending on OS and hardware).</td><td>-audio.fragment_size</td></tr>
<tr><td>Sample rate</td><td>
Output samples per second. Higher values reduce artifacts from resampling and decrease latency,
but may lead to dropouts (depending on OS and hardware).
<tr><td>Resampling quality</td><td>
Chooses the algorithm used for resampling (= converting TIA output to the target sample rate).
'High' and 'ultra' use a high-quality Lanczos filter
but require slightly more CPU, while 'low' may lead to audible screeching artifacts in
some games (notably Quadrun).
<tr><td>Headroom</td><td>Number of frames to buffer before playback starts. Higher values increase latency, but reduce the potential for dropouts.</td><td>-audio.headroom</td></tr>
<tr><td>Buffer size</td><td>Maximum size of the audio buffer. Higher values increase maximum latency, but reduce the potential for dropouts</td><td>-audio.buffer_size</td></tr>
<strong>IMPORTANT:</strong> In order to maintain a stable stream of audio data, emulation speed must be
synchronized with the audio hardware. Buffering happens in multiple places (OS = fragment size, Stella =
headroom and buffer size) and improves the tolerance to speed fluctuations, but introduces latency which
manifests as a lag between audio and video.
Too aggressive settings for your combination of hardware and software (high sample rate,
low fragment size, low headroom, low buffer size) may lead to audio dropouts whose effect may range from
isolated popping artifacts to garbled audio. You can check the system log for related messages. If you
get recurring messages about audio overruns and underruns (isolates underruns / overruns are normal
and a consequence of host system activity), you might have to adjust your settings.
......@@ -52,7 +52,7 @@ AudioDialog::AudioDialog(OSystem& osystem, DialogContainer& parent,
VariantList items;
// Set real dimensions
_w = 46 * fontWidth + HBORDER * 2;
_w = 48 * fontWidth + HBORDER * 2;
_h = 11 * (lineHeight + VGAP) + VBORDER + _th;
xpos = HBORDER; ypos = VBORDER + _th;
......@@ -87,15 +87,15 @@ AudioDialog::AudioDialog(OSystem& osystem, DialogContainer& parent,
xpos += INDENT;
// Fragment size
pwidth = font.getStringWidth("512 bytes");
pwidth = font.getStringWidth("512 samples");
lwidth = font.getStringWidth("Resampling quality ");
VarList::push_back(items, "128 bytes", 128);
VarList::push_back(items, "256 bytes", 256);
VarList::push_back(items, "512 bytes", 512);
VarList::push_back(items, "1 KB", 1024);
VarList::push_back(items, "2 KB", 2048);
VarList::push_back(items, "4 KB", 4096);
VarList::push_back(items, "128 samples", 128);
VarList::push_back(items, "256 samples", 256);
VarList::push_back(items, "512 samples", 512);
VarList::push_back(items, "1 kSamples", 1024);
VarList::push_back(items, "2 kSamples", 2048);
VarList::push_back(items, "4 KSamples", 4096);
myFragsizePopup = new PopUpWidget(this, font, xpos, ypos,
pwidth, lineHeight,
items, "Fragment size", lwidth);
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