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docs: fix warnings and errors in filter documentation
This commit is contained in:
Julian Bouzas
parent
3eaaae3a45
commit
0c53f9b130
1 changed files with 84 additions and 40 deletions
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@ -72,11 +72,15 @@ For example, the media class of the nodes for a input filter would be:
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And, if this filter is used between an application stream, and the default audio
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device, the graph would look like this:
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application stream node -> filter main node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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filter stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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application stream node -> filter main node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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filter stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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On the other hand, the media class of the nodes for an output filter would be:
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@ -88,11 +92,15 @@ And the same logic is applied if they are used, but in the opposite direction.
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This is how the graph would look like if an application wants to capture audio
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from a device that uses an input filter.
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application stream node <- filter main node
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(Stream/Input/Audio) (Audio/Source)
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.. code-block::
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filter stream node <- default device node
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(Stream/Input/Audio) (Audio/Source)
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application stream node <- filter main node
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(Stream/Input/Audio) (Audio/Source)
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.. code-block::
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filter stream node <- default device node
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(Stream/Input/Audio) (Audio/Source)
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Finally, if multiple filters have the same direction, they can also be chained
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together so that the audio of a filter is sent to the input of the next filter.
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@ -109,20 +117,27 @@ are automatically linked by the wirepluber policy in any way we want.
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Currently, if a filter node is created, wireplumber will check the following
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optional node properties on the main node:
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- filter.name: the unique name of the filter. WirePlumber will use the
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"node.link-group" property as filter name if this property is not set.
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- filter.enabled: Boolean indicating whether the filter should be used at all
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or not. If it is not set, wireplumber will consider the filter enabled by default.
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- filter.target: a JSON object that defines the matching properties of the filter's
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target node. A filter target can never be another filter node (wireplumber will
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ignore it), and must always be a device node. If this property is not set,
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WirePlumber will use the default node as target.
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- filter.before: a JSON array with the filters names that are supposed to be
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used before this filter. If not set, wireplumber will link the filters by order
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of creation.
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- filter.after: a JSON array with the filters names that are supposed to be
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used after this filter. If not set, wireplumber will link the filters by order
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of creation.
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- filter.name:
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The unique name of the filter. WirePlumber will use the "node.link-group"
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property as filter name if this property is not set.
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- filter.enabled:
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Boolean indicating whether the filter should be used at all or not. If it is
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not set, wireplumber will consider the filter enabled by default.
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- filter.target:
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A JSON object that defines the matching properties of the filter's target node.
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A filter target can never be another filter node (wireplumber will ignore it),
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and must always be a device node. If this property is not set, WirePlumber will
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use the default node as target.
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- filter.before:
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A JSON array with the filters names that are supposed to be used before this
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filter. If not set, wireplumber will link the filters by order of creation.
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- filter.after:
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A JSON array with the filters names that are supposed to be used after this
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filter. If not set, wireplumber will link the filters by order of creation.
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Note that these properties must be set in the filter's main node, not the
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filter's stream node.
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@ -136,6 +151,8 @@ The PipeWire configuration files for the 2 filters should be like this:
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- /usr/share/pipewire/pipewire.conf.d/loopback-1.conf:
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.. code-block::
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context.modules = [
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{ name = libpipewire-module-loopback
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args = {
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@ -159,6 +176,8 @@ The PipeWire configuration files for the 2 filters should be like this:
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- /usr/share/pipewire/pipewire.conf.d/loopback-2.conf:
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.. code-block::
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context.modules = [
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{ name = libpipewire-module-loopback
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args = {
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@ -183,15 +202,20 @@ Finally, if we restart PipeWire and WirePlumber to apply the configuration
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changes, and play a test.wave audio file with paplay to see if wireplumber links
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the filter nodes properly, the graph should look like this:
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.. code-block::
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paplay node -> loopback-1 main node
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(Stream/Output/Audio) (Audio/Sink)
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paplay node -> loopback-1 main node
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(Stream/Output/Audio) (Audio/Sink)
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loopback-1 stream node -> loopback-1 main node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-2 stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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loopback-1 stream node -> loopback-1 main node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-2 stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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If we remove `filter.before = [ loopback-2 ]` property from the loopback-1 filter,
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@ -199,14 +223,20 @@ and add a `filter.before = [ loopback-1 ]` property in the loopback-2 filter
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configuration file. WirePlumber should link the loopback-1 filter as the last filter
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in the chain, like this:
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paplay node -> loopback-2 main node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-2 stream node -> loopback-1 main node
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(Stream/Output/Audio) (Audio/Sink)
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paplay node -> loopback-2 main node
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(Stream/Output/Audio) (Audio/Sink)
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loopback-1 stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-2 stream node -> loopback-1 main node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-1 stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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On the other hand, the filters can have different targets. For example, we can
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@ -214,6 +244,8 @@ define the filters like this:
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- `/usr/share/pipewire/pipewire.conf.d/loopback-1.conf`:
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.. code-block::
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context.modules = [
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{ name = libpipewire-module-loopback
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args = {
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@ -238,6 +270,8 @@ define the filters like this:
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- `/usr/share/pipewire/pipewire.conf.d/loopback-2.conf`:
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.. code-block::
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context.modules = [
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{ name = libpipewire-module-loopback
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args = {
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@ -261,14 +295,20 @@ define the filters like this:
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If this is the case, WirePlumber will link the filters like this when using
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paplay:
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paplay node -> loopback-2 main node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-2 stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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paplay node -> loopback-2 main node
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(Stream/Output/Audio) (Audio/Sink)
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loopback-1 stream node -> not-default-audio-device-name device node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-2 stream node -> default device node
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(Stream/Output/Audio) (Audio/Sink)
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.. code-block::
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loopback-1 stream node -> not-default-audio-device-name device node
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(Stream/Output/Audio) (Audio/Sink)
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The loopback-1 main node will only be used if an application wants to play audio
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on the device node with node name "not-default-audio-device-name".
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@ -283,10 +323,14 @@ policy at runtime.
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For example, if loopback-1 main node Id is `40`, we can disable the filter by
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setting its "filter.enabled" metadata key to false using the `pw-metadata` tool:
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.. code-block::
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$ pw-metadata -n filters 40 "filter.enabled" false Spa:String:JSON
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We can also change the target of a filter at runtime:
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.. code-block::
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$ pw-metadata -n filters 40 "filter.target" { node.name = "new-target-node-name" } Spa:String:JSON
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Every time a key in the filters metadata changes, all filters are unlinked and
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