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Pad: allow building a Pad with an automatically generated name

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For convenience, the `Pad` builder checks a name is provided when a wildcard-
named template is used. For `GhostPad`s, the builder tries to assign the name of
the target `Pad` making sure the provided `name` conforms to the `PadTemplate`.

This commit adds a function to optionally keep the `gst::Object` automatically
generated unique `Pad` name (such as `ghostpad4`) and reorganises name handling
so it is processed when `build` is invoked.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1428>
This commit is contained in:
François Laignel 2024-04-26 08:11:24 +02:00 committed by GStreamer Marge Bot
parent e117010bc0
commit 953e3747f2
2 changed files with 239 additions and 135 deletions
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158
gstreamer/src/ghost_pad.rs
View file

@ -56,6 +56,8 @@ impl GhostPad {
// rustdoc-stripper-ignore-next
/// Creates a new [`GhostPad`] with an automatically generated name.
///
/// The [`Pad`] will be assigned the usual `gst::Object` generated unique name.
///
/// Use [`GhostPad::builder_from_template()`] to get a [`PadBuilder`](crate::PadBuilder)
/// and define options.
#[doc(alias = "gst_ghost_pad_new_no_target")]
@ -65,10 +67,7 @@ impl GhostPad {
}
// rustdoc-stripper-ignore-next
/// Creates a [`PadBuilder`](crate::PadBuilder) for a [`PadBuilder`] with an automatically generated name.
///
/// Use [`PadBuilder::name`](crate::PadBuilder::name) or [`PadBuilder::maybe_name`](crate::PadBuilder::maybe_name)
/// to specify a different name.
/// Creates a [`PadBuilder`](crate::PadBuilder) with the specified [`PadDirection`](crate::PadDirection).
#[doc(alias = "gst_ghost_pad_new_no_target")]
pub fn builder(direction: crate::PadDirection) -> PadBuilder<Self> {
skip_assert_initialized!();
@ -82,12 +81,15 @@ impl GhostPad {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `GhostPad` will automatically be named after the `name_template`.
///
/// Use [`GhostPad::builder_from_template()`] to get a [`PadBuilder`](crate::PadBuilder)
/// and define options.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
///
/// # Panics
///
/// Panics if the `name_template` is a wildcard-name.
///
/// Use [`GhostPad::builder_from_template()`] to get a [`PadBuilder`](crate::PadBuilder)
/// and define options.
#[doc(alias = "gst_ghost_pad_new_no_target_from_static_template")]
pub fn from_static_template(templ: &StaticPadTemplate) -> Self {
skip_assert_initialized!();
@ -103,6 +105,9 @@ impl GhostPad {
///
/// Use [`PadBuilder::name`](crate::PadBuilder::name) or [`PadBuilder::maybe_name`](crate::PadBuilder::maybe_name)
/// to specify a different name.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_ghost_pad_new_no_target_from_static_template")]
pub fn builder_from_static_template(templ: &StaticPadTemplate) -> PadBuilder<Self> {
skip_assert_initialized!();
@ -116,12 +121,15 @@ impl GhostPad {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `GhostPad` will automatically be named after the `name_template`.
///
/// Use [`GhostPad::builder_from_template()`] to get a [`PadBuilder`](crate::PadBuilder)
/// and define options.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
///
/// # Panics
///
/// Panics if the `name_template` is a wildcard-name.
///
/// Use [`GhostPad::builder_from_template()`] to get a [`PadBuilder`](crate::PadBuilder)
/// and define options.
#[doc(alias = "gst_ghost_pad_new_no_target_from_template")]
pub fn from_template(templ: &crate::PadTemplate) -> Self {
skip_assert_initialized!();
@ -137,6 +145,9 @@ impl GhostPad {
///
/// Use [`PadBuilder::name`](crate::PadBuilder::name) or [`PadBuilder::maybe_name`](crate::PadBuilder::maybe_name)
/// to specify a different name.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_ghost_pad_new_no_target_from_template")]
pub fn builder_from_template(templ: &crate::PadTemplate) -> PadBuilder<Self> {
skip_assert_initialized!();
@ -150,6 +161,9 @@ impl GhostPad {
///
/// Use [`GhostPad::builder_with_target()`] to get a [`PadBuilder`](crate::PadBuilder)
/// and define options.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_ghost_pad_new")]
pub fn with_target<P: IsA<Pad> + IsA<crate::Object>>(
target: &P,
@ -165,13 +179,15 @@ impl GhostPad {
///
/// Use [`PadBuilder::name`](crate::PadBuilder::name) or [`PadBuilder::maybe_name`](crate::PadBuilder::maybe_name)
/// to specify a different name.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_ghost_pad_new_no_target_from_template")]
pub fn builder_with_target<P: IsA<Pad> + IsA<crate::Object>>(
target: &P,
) -> Result<PadBuilder<Self>, glib::BoolError> {
skip_assert_initialized!();
let mut builder = Self::builder(target.direction());
builder.needs_specific_name = true;
let builder = Self::builder(target.direction());
builder.with_target(target)
}
@ -186,6 +202,9 @@ impl GhostPad {
/// If the `name_template` is a wildcard-name, then the `target` `name` is used,
/// if it is compatible. Otherwise, a specific name must be provided using
/// [`PadBuilder::name`](crate::PadBuilder::name) or [`PadBuilder::maybe_name`](crate::PadBuilder::maybe_name).
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_ghost_pad_new_from_template")]
pub fn from_template_with_target<P: IsA<Pad> + IsA<crate::Object>>(
templ: &crate::PadTemplate,
@ -206,6 +225,9 @@ impl GhostPad {
/// If the `name_template` is a wildcard-name, then the `target` `name` is used,
/// if it is compatible. Otherwise, a specific name must be provided using
/// [`PadBuilder::name`](crate::PadBuilder::name) or [`PadBuilder::maybe_name`](crate::PadBuilder::maybe_name).
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_ghost_pad_new_from_template")]
pub fn builder_from_template_with_target<P: IsA<Pad> + IsA<crate::Object>>(
templ: &crate::PadTemplate,
@ -689,6 +711,9 @@ impl<T: IsA<GhostPad> + IsA<Pad>> PadBuilder<T> {
/// If the `name_template` is a wildcard-name, then the `target` `name` is used,
/// if it is compatible. Otherwise, a specific name must be provided using
/// [`PadBuilder::name`](crate::PadBuilder::name) or [`PadBuilder::maybe_name`](crate::PadBuilder::maybe_name).
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
pub fn with_target<P: IsA<Pad> + IsA<crate::Object>>(
mut self,
target: &P,
@ -696,92 +721,8 @@ impl<T: IsA<GhostPad> + IsA<Pad>> PadBuilder<T> {
assert_eq!(self.pad.direction(), target.direction());
self.pad.set_target(Some(target))?;
if self.needs_specific_name {
let mut can_assign_target_name = true;
if let Some(pad_template) = self.pad.pad_template() {
if pad_template.presence() == crate::PadPresence::Request {
// Check if the target name is compatible with the name template.
use crate::CAT_RUST;
let target_name = target.name();
let mut target_parts = target_name.split('_');
for template_part in pad_template.name_template().split('_') {
let Some(target_part) = target_parts.next() else {
crate::debug!(
CAT_RUST,
"Not using target Pad name '{target_name}': not enough parts compared to template '{}'",
pad_template.name_template(),
);
can_assign_target_name = false;
break;
};
if let Some(conv_spec_start) = template_part.find('%') {
if conv_spec_start > 0
&& !target_part.starts_with(&template_part[..conv_spec_start])
{
crate::debug!(
CAT_RUST,
"Not using target Pad name '{target_name}': mismatch template '{}' prefix",
pad_template.name_template(),
);
can_assign_target_name = false;
break;
}
let conv_spec_pos = conv_spec_start + 1;
match template_part.get(conv_spec_pos..=conv_spec_pos) {
Some("s") => {
// *There can be only one* %s
break;
}
Some("u") => {
if target_part
.get(conv_spec_start..)
.map_or(true, |s| s.parse::<u32>().is_err())
{
crate::debug!(
CAT_RUST,
"Not using target Pad name '{target_name}': can't parse '%u' from '{target_part}' (template '{}')",
pad_template.name_template(),
);
can_assign_target_name = false;
break;
}
}
Some("d") => {
if target_part
.get(conv_spec_start..)
.map_or(true, |s| s.parse::<i32>().is_err())
{
crate::debug!(
CAT_RUST,
"Not using target Pad name '{target_name}': can't parse '%i' from '{target_part}' (template '{}')",
pad_template.name_template(),
);
can_assign_target_name = false;
break;
}
}
other => unreachable!("Unexpected conversion specifier {other:?}"),
}
} else if target_part != template_part {
can_assign_target_name = false;
break;
}
}
}
}
if can_assign_target_name {
self.pad.set_property("name", target.name());
self.needs_specific_name = false;
}
}
self.name =
crate::pad::PadBuilderName::CandidateForWildcardTemplate(target.name().to_string());
Ok(self)
}
@ -911,6 +852,13 @@ mod tests {
.name("ghost_test")
.build();
assert_eq!(ghost_pad.name(), "ghost_test");
let target = crate::Pad::from_template(&templ);
let ghost_pad = GhostPad::builder_with_target(&target)
.unwrap()
.generated_name()
.build();
assert!(ghost_pad.name().starts_with("ghostpad"));
}
#[test]
@ -952,6 +900,13 @@ mod tests {
.build();
assert_eq!(ghost_pad.name(), "my-sink");
let target = crate::Pad::from_template(&sink_templ);
let ghost_pad = GhostPad::builder_from_template_with_target(&ghost_templ, &target)
.unwrap()
.generated_name()
.build();
assert!(ghost_pad.name().starts_with("ghostpad"));
// # Request template %u
let wildcard_u_templ = crate::PadTemplate::new(
"sink_%u",
@ -983,6 +938,13 @@ mod tests {
.build();
assert_eq!(ghost_pad.name(), "sink_0");
let target = crate::Pad::from_template(&sink_0_templ);
let ghost_pad = GhostPad::builder_from_template_with_target(&wildcard_u_templ, &target)
.unwrap()
.generated_name()
.build();
assert!(ghost_pad.name().starts_with("ghostpad"));
// # Request template %d_%u
let wildcard_u_templ = crate::PadTemplate::new(
"sink_%d_%u",

216
gstreamer/src/pad.rs
View file

@ -1428,7 +1428,7 @@ impl Pad {
// rustdoc-stripper-ignore-next
/// Creates a new [`Pad`] with the specified [`PadDirection`](crate::PadDirection).
///
/// An automatically generated name will be assigned.
/// The [`Pad`] will be assigned the usual `gst::Object` generated unique name.
///
/// Use [`Pad::builder()`] to get a [`PadBuilder`] and define options.
#[doc(alias = "gst_pad_new")]
@ -1439,8 +1439,6 @@ impl Pad {
// rustdoc-stripper-ignore-next
/// Creates a [`PadBuilder`] with the specified [`PadDirection`](crate::PadDirection).
///
/// An automatically generated name will be assigned.
#[doc(alias = "gst_pad_new")]
pub fn builder(direction: crate::PadDirection) -> PadBuilder<Self> {
skip_assert_initialized!();
@ -1454,11 +1452,14 @@ impl Pad {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `Pad` will automatically be named after the `name_template`.
///
/// Use [`Pad::builder_from_static_template()`] to get a [`PadBuilder`] and define options.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
///
/// # Panics
///
/// Panics if the `name_template` is a wildcard-name.
///
/// Use [`Pad::builder_from_static_template()`] to get a [`PadBuilder`] and define options.
#[doc(alias = "gst_pad_new_from_static_template")]
pub fn from_static_template(templ: &StaticPadTemplate) -> Self {
skip_assert_initialized!();
@ -1472,7 +1473,8 @@ impl Pad {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `Pad` will automatically be named after the `name_template`.
///
/// Use [`PadBuilder::name`] or [`PadBuilder::maybe_name`] to specify a different name.
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_pad_new_from_static_template")]
pub fn builder_from_static_template(templ: &StaticPadTemplate) -> PadBuilder<Self> {
skip_assert_initialized!();
@ -1486,11 +1488,11 @@ impl Pad {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `Pad` will automatically be named after the `name_template`.
///
/// Use [`Pad::builder_from_template()`] to get a [`PadBuilder`] and define options.
///
/// # Panics
///
/// Panics if the `name_template` is a wildcard-name.
///
/// Use [`Pad::builder_from_template()`] to get a [`PadBuilder`] and define options.
#[doc(alias = "gst_pad_new_from_template")]
pub fn from_template(templ: &crate::PadTemplate) -> Self {
skip_assert_initialized!();
@ -1504,7 +1506,8 @@ impl Pad {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `Pad` will automatically be named after the `name_template`.
///
/// Use [`PadBuilder::name`] or [`PadBuilder::maybe_name`] to specify a different name.
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[doc(alias = "gst_pad_new_from_template")]
pub fn builder_from_template(templ: &crate::PadTemplate) -> PadBuilder<Self> {
skip_assert_initialized!();
@ -1558,18 +1561,22 @@ impl Pad {
}
}
pub(crate) enum PadBuilderName {
Undefined,
KeepGenerated,
UserDefined(String),
CandidateForWildcardTemplate(String),
}
#[must_use = "The builder must be built to be used"]
pub struct PadBuilder<T> {
pub(crate) pad: T,
pub(crate) needs_specific_name: bool,
pub(crate) name: PadBuilderName,
}
impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
// rustdoc-stripper-ignore-next
/// Creates a `PadBuilder` with the specified [`PadDirection`](crate::PadDirection).
///
/// An automatically generated name will be assigned. Use [`PadBuilder::name`] or
/// [`PadBuilder::maybe_name`] to define a specific name.
pub fn new(direction: crate::PadDirection) -> Self {
assert_initialized_main_thread!();
@ -1588,7 +1595,7 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
PadBuilder {
pad,
needs_specific_name: false,
name: PadBuilderName::Undefined,
}
}
@ -1599,7 +1606,8 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `Pad` will automatically be named after the `name_template`.
///
/// Use [`PadBuilder::name`] or [`PadBuilder::maybe_name`] to specify a different name.
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
pub fn from_static_template(templ: &StaticPadTemplate) -> Self {
skip_assert_initialized!();
@ -1614,7 +1622,8 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
/// i.e. if it's not a wildcard-name containing `%u`, `%s` or `%d`,
/// the `Pad` will automatically be named after the `name_template`.
///
/// Use [`PadBuilder::name`] or [`PadBuilder::maybe_name`] to specify a different name.
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
pub fn from_template(templ: &crate::PadTemplate) -> Self {
assert_initialized_main_thread!();
@ -1654,25 +1663,23 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
}
}
let needs_specific_name = if templ.name().find('%').is_some() {
// Pad needs a specific name
true
} else {
pad.set_property("name", templ.name());
false
};
PadBuilder {
pad,
needs_specific_name,
name: PadBuilderName::Undefined,
}
}
// rustdoc-stripper-ignore-next
/// Uses the `gst::Object` generated unique name.
pub fn generated_name(mut self) -> Self {
self.name = PadBuilderName::KeepGenerated;
self
}
// rustdoc-stripper-ignore-next
/// Sets the name of the Pad.
pub fn name(mut self, name: impl glib::IntoGStr) -> Self {
name.run_with_gstr(|name| self.pad.set_property("name", name));
self.needs_specific_name = false;
pub fn name(mut self, name: impl Into<String>) -> Self {
self.name = PadBuilderName::UserDefined(name.into());
self
}
@ -1682,7 +1689,7 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
///
/// This method is convenient when the `name` is provided as an `Option`.
/// If the `name` is `None`, this has no effect.
pub fn maybe_name<N: glib::IntoGStr>(self, name: Option<N>) -> Self {
pub fn maybe_name<N: Into<String>>(self, name: Option<N>) -> Self {
if let Some(name) = name {
self.name(name)
} else {
@ -1695,7 +1702,7 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
///
/// This method is convenient when the `name` is provided as an `Option`.
/// If the `name` is `None`, this has no effect.
pub fn name_if_some<N: glib::IntoGStr>(self, name: Option<N>) -> Self {
pub fn name_if_some<N: Into<String>>(self, name: Option<N>) -> Self {
if let Some(name) = name {
self.name(name)
} else {
@ -2047,18 +2054,132 @@ impl<T: IsA<Pad> + IsA<glib::Object> + glib::object::IsClass> PadBuilder<T> {
/// and no specific `name` was provided using [`PadBuilder::name`]
/// or [`PadBuilder::maybe_name`], or for [`GhostPad`s](crate::GhostPad),
/// by defining a `target`.
///
/// Use [`generated_name()`](crate::PadBuilder::generated_name`) to keep the `gst::Object`
/// automatically generated unique name.
#[must_use = "Building the pad without using it has no effect"]
#[track_caller]
pub fn build(self) -> T {
if self.needs_specific_name {
panic!(concat!(
"Attempt to build a Pad from a wildcard-name template",
" or with a target Pad with an incompatible name.",
" Make sure to define a specific name using PadBuilder.",
));
let Self { pad, name } = self;
let templ = pad.pad_template();
use PadBuilderName::*;
match (name, templ) {
(KeepGenerated, _) => (),
(Undefined, None) => (),
(Undefined, Some(templ)) => {
if templ.name().find('%').is_some() {
panic!(concat!(
"Attempt to build a Pad from a wildcard-name template",
" or with a target Pad with an incompatible name.",
" Make sure to define a specific name using PadBuilder",
" or opt-in to keep the automatically generated name.",
));
} else {
pad.set_property("name", templ.name());
}
}
(UserDefined(name), _) | (CandidateForWildcardTemplate(name), None) => {
pad.set_property("name", name);
}
(CandidateForWildcardTemplate(name), Some(templ)) => {
if templ.name().find('%').is_none() {
// Not a widlcard template
pad.set_property("name", templ.name());
} else {
let mut can_assign_name = true;
if templ.presence() == crate::PadPresence::Request {
// Check if the name is compatible with the name template.
use crate::CAT_RUST;
let mut name_parts = name.split('_');
for templ_part in templ.name_template().split('_') {
let Some(name_part) = name_parts.next() else {
crate::debug!(
CAT_RUST,
"Not using Pad name '{name}': not enough parts compared to template '{}'",
templ.name_template(),
);
can_assign_name = false;
break;
};
if let Some(conv_spec_start) = templ_part.find('%') {
if conv_spec_start > 0
&& !name_part.starts_with(&templ_part[..conv_spec_start])
{
crate::debug!(
CAT_RUST,
"Not using Pad name '{name}': mismatch template '{}' prefix",
templ.name_template(),
);
can_assign_name = false;
break;
}
let conv_spec_pos = conv_spec_start + 1;
match templ_part.get(conv_spec_pos..=conv_spec_pos) {
Some("s") => {
// *There can be only one* %s
break;
}
Some("u") => {
if name_part
.get(conv_spec_start..)
.map_or(true, |s| s.parse::<u32>().is_err())
{
crate::debug!(
CAT_RUST,
"Not using Pad name '{name}': can't parse '%u' from '{name_part}' (template '{}')",
templ.name_template(),
);
can_assign_name = false;
break;
}
}
Some("d") => {
if name_part
.get(conv_spec_start..)
.map_or(true, |s| s.parse::<i32>().is_err())
{
crate::debug!(
CAT_RUST,
"Not using target Pad name '{name}': can't parse '%i' from '{name_part}' (template '{}')",
templ.name_template(),
);
can_assign_name = false;
break;
}
}
other => {
unreachable!("Unexpected conversion specifier {other:?}")
}
}
} else if name_part != templ_part {
can_assign_name = false;
}
}
}
if can_assign_name {
pad.set_property("name", name);
} else {
panic!(concat!(
"Attempt to build a Pad from a wildcard-name template",
" with a target Pad with an incompatible name.",
" Make sure to define a specific name using PadBuilder",
" or opt-in to keep the automatically generated name.",
));
}
}
}
}
self.pad
pad
}
}
@ -2484,11 +2605,21 @@ mod tests {
let pad = crate::Pad::builder(crate::PadDirection::Unknown).build();
assert!(pad.name().starts_with("pad"));
let pad = crate::Pad::builder(crate::PadDirection::Unknown)
.generated_name()
.build();
assert!(pad.name().starts_with("pad"));
let pad = crate::Pad::builder(crate::PadDirection::Unknown)
.maybe_name(None::<&str>)
.build();
assert!(pad.name().starts_with("pad"));
let pad = crate::Pad::builder(crate::PadDirection::Unknown)
.name_if_some(None::<&str>)
.build();
assert!(pad.name().starts_with("pad"));
let pad = crate::Pad::builder(crate::PadDirection::Sink)
.name("sink_0")
.build();
@ -2509,6 +2640,11 @@ mod tests {
.build();
assert_eq!(pad.name(), "test");
let pad = crate::Pad::builder(crate::PadDirection::Unknown)
.name_if_some(Some("test"))
.build();
assert_eq!(pad.name(), "test");
let caps = crate::Caps::new_any();
let templ = crate::PadTemplate::new(
"sink",
@ -2526,6 +2662,9 @@ mod tests {
.build();
assert!(pad.name().starts_with("audio_sink"));
let pad = Pad::builder_from_template(&templ).generated_name().build();
assert!(pad.name().starts_with("pad"));
let templ = crate::PadTemplate::new(
"audio_%u",
crate::PadDirection::Sink,
@ -2536,6 +2675,9 @@ mod tests {
let pad = Pad::builder_from_template(&templ).name("audio_0").build();
assert!(pad.name().starts_with("audio_0"));
let pad = Pad::builder_from_template(&templ).generated_name().build();
assert!(pad.name().starts_with("pad"));
}
#[test]