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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - PA_CHANNEL_MAP_DEFAULT is nearly useless"
href="https://bugs.freedesktop.org/show_bug.cgi?id=56084">56084</a>
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<th>CC</th>
<td>lennart@poettering.net
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
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<th>Summary</th>
<td>PA_CHANNEL_MAP_DEFAULT is nearly useless
</td>
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<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
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<th>Severity</th>
<td>normal
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
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<th>Reporter</th>
<td>tanuk@iki.fi
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<th>Hardware</th>
<td>Other
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Component</th>
<td>clients
</td>
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<th>Product</th>
<td>PulseAudio
</td>
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<p>
<div>
<pre>The usefulness of the whole pa_channel_map_def enum is questionable. It's only
used with pa_channel_map_init_auto(), and that function is prone to cause bugs,
because client programmers like to use it instead of initializing the channel
map properly. pa_channel_map_init_auto() is very rarely the right choice. But
this bug is not about that. This bug is about the PA_CHANNEL_MAP_DEFAULT
definition. The only use that I can think for that definition is when only the
number of channels is known, and pulseaudio should guess what the channel map
is. Currently it's defined as PA_CHANNEL_MAP_AIFF, which is not very suitable
for being the default: it only contains definitions for up to 6 channels, and
even the 6-channel definition is not a 5.1 mapping (no lfe channel). The
default mapping should be our best guess for what is the most common channel
map for a given number of channels.
Also, pa_channel_map_def (or pa_channel_map_init_auto()) should be documented
better. The documentation should clearly say when it's appropriate to auto-init
the channel map and when it should be initialized manually.</pre>
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