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When getting or setting the volume fails, the MPD core close the
mixer. Moved the duplicated code from the mixer plugins.
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Remember if a mixer object is open or closed. Don't call open() again
if it is already open. This guarantees that the mixer plugin is
always called in a consistent state, and we will be able to remove
lots of checks from the implementations.
To support mixers which are automatically opened even if the audio
output is still closed (to set the volume before playback starts),
this patch also adds the "global" flag to the mixer_plugin struct.
Both ALSA and OSS set this flag, while PULSE does not.
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This updates the copyright header to all be the same, which is
pretty much an update of where to mail request for a copy of the GPL
and the years of the MPD project. This also puts all committers under
'The Music Player Project' umbrella. These entries should go
individually in the AUTHORS file, for consistancy.
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The method control() is too complicated, and overengineered. Replace
it with two trivial functions: get_volume() and set_volume().
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The mixer plugins should re-use the mixer struct and incorporate it in
their object class.
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Both methods are always called together. There is no point in having
them separate. This simplifies the code, because the old configure()
method could be called more than once, and had to free old
allocations.
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Those have been superseded by the new legacy configuration code.
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The plugin structures must never be modified.
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Return the default value in the conf_get_block_*() functions when
param==NULL was passed.
This simplifies a lot of code, because all initialization can be done
in one code path, regardless whether configuration is present.
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All config_get_block_*() functions should accept constant config_param
pointers.
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This replaces lots of getBlockParam() invocations.
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The g_free() function includes a NULL check. We don't have to do it
twice.
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Renamed functions, types, variables.
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When MPD starts without audio output configuration, the "param"
variable is NULL. This triggers a segmentation fault in both mixer
plugins.
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mixer (passing parameters)
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This patch tryes to introduce pluggable mixer (struct mixer_plugin) along with some basic infrastructure (mixer_* functions). Instance of mixer (struct mixer) is used in
alsa and oss output plugin
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There is no reason to use the shortcut "mix" instead of "mixer".
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