mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
synced 2025-01-16 12:15:44 +00:00
fe319af598
The trait FormattedValue was only implemented on types which
could implement the full range of values for a Format. In order
to declare a function which could take both the intrinsic type
of any Format (e.g. `ClockTime`) as well the full range of values
(e.g. `Option<ClockTime>`), the argument was declared:
```rust
impl Into<GenericFormattedValue>,
```
This commit implements `FormattedValue` for any type representing
a format. E.g.: both `ClockTime` and `Option<ClockTime>` will now
implement `FormattedValue`. The trait `FormattedValueFullRange`
is implemented on types which can be built from any raw value.
These changes are intended to help for the implementation of a
means to enforce format conformity at compilation time for
functions with multiple formatted value arguments.
The following signatures were found to be incorrect and are fixed:
- `message::StepDone`: forced the type for `amount` and `duration`
to be of the same type, when `duration` is expected to be of the
`Time` format.
- `query::Convert::set`: the two arguments were forced to the same
type, so potentialy the same format, unless a
`GenericFormattedValue` was used.
See https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1059
314 lines
9.7 KiB
Rust
314 lines
9.7 KiB
Rust
// Take a look at the license at the top of the repository in the LICENSE file.
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use std::mem;
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use crate::prelude::*;
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use glib::translate::*;
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use gst::subclass::prelude::*;
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use crate::BaseParse;
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use crate::BaseParseFrame;
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pub trait BaseParseImpl: BaseParseImplExt + ElementImpl {
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fn start(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
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self.parent_start(element)
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}
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fn stop(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
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self.parent_stop(element)
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}
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fn set_sink_caps(
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&self,
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element: &Self::Type,
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caps: &gst::Caps,
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) -> Result<(), gst::LoggableError> {
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self.parent_set_sink_caps(element, caps)
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}
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fn handle_frame<'a>(
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&'a self,
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element: &Self::Type,
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frame: BaseParseFrame,
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) -> Result<(gst::FlowSuccess, u32), gst::FlowError> {
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self.parent_handle_frame(element, frame)
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}
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fn convert(
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&self,
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element: &Self::Type,
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src_val: impl gst::FormattedValue,
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dest_format: gst::Format,
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) -> Option<gst::GenericFormattedValue> {
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self.parent_convert(element, src_val, dest_format)
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}
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}
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pub trait BaseParseImplExt: ObjectSubclass {
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fn parent_start(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage>;
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fn parent_stop(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage>;
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fn parent_set_sink_caps(
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&self,
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element: &Self::Type,
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caps: &gst::Caps,
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) -> Result<(), gst::LoggableError>;
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fn parent_handle_frame<'a>(
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&'a self,
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element: &Self::Type,
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frame: BaseParseFrame,
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) -> Result<(gst::FlowSuccess, u32), gst::FlowError>;
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fn parent_convert(
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&self,
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element: &Self::Type,
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src_val: impl gst::FormattedValue,
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dest_format: gst::Format,
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) -> Option<gst::GenericFormattedValue>;
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}
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impl<T: BaseParseImpl> BaseParseImplExt for T {
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fn parent_start(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
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unsafe {
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let data = Self::type_data();
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let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseParseClass;
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(*parent_class)
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.start
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.map(|f| {
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if from_glib(f(element.unsafe_cast_ref::<BaseParse>().to_glib_none().0)) {
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Ok(())
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} else {
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Err(gst::error_msg!(
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gst::CoreError::StateChange,
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["Parent function `start` failed"]
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))
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}
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})
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.unwrap_or(Ok(()))
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}
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}
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fn parent_stop(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
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unsafe {
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let data = Self::type_data();
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let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseParseClass;
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(*parent_class)
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.stop
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.map(|f| {
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if from_glib(f(element.unsafe_cast_ref::<BaseParse>().to_glib_none().0)) {
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Ok(())
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} else {
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Err(gst::error_msg!(
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gst::CoreError::StateChange,
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["Parent function `stop` failed"]
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))
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}
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})
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.unwrap_or(Ok(()))
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}
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}
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fn parent_set_sink_caps(
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&self,
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element: &Self::Type,
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caps: &gst::Caps,
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) -> Result<(), gst::LoggableError> {
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unsafe {
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let data = Self::type_data();
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let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseParseClass;
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(*parent_class)
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.set_sink_caps
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.map(|f| {
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gst::result_from_gboolean!(
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f(
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element.unsafe_cast_ref::<BaseParse>().to_glib_none().0,
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caps.to_glib_none().0,
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),
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gst::CAT_RUST,
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"Parent function `set_sink_caps` failed",
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)
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})
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.unwrap_or(Ok(()))
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}
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}
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fn parent_handle_frame<'a>(
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&'a self,
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element: &'a Self::Type,
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frame: BaseParseFrame,
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) -> Result<(gst::FlowSuccess, u32), gst::FlowError> {
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unsafe {
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let data = Self::type_data();
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let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseParseClass;
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let mut skipsize = 0;
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(*parent_class)
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.handle_frame
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.map(|f| {
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let res = try_from_glib(f(
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element.unsafe_cast_ref::<BaseParse>().to_glib_none().0,
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frame.to_glib_none().0,
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&mut skipsize,
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));
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(res.unwrap(), skipsize as u32)
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})
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.ok_or(gst::FlowError::Error)
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}
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}
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fn parent_convert(
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&self,
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element: &Self::Type,
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src_val: impl gst::FormattedValue,
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dest_format: gst::Format,
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) -> Option<gst::GenericFormattedValue> {
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unsafe {
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let data = Self::type_data();
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let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseParseClass;
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let res = (*parent_class).convert.map(|f| {
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let mut dest_val = mem::MaybeUninit::uninit();
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let res = from_glib(f(
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element.unsafe_cast_ref::<BaseParse>().to_glib_none().0,
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src_val.format().into_glib(),
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src_val.into_raw_value(),
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dest_format.into_glib(),
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dest_val.as_mut_ptr(),
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));
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(res, dest_val)
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});
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match res {
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Some((true, dest_val)) => Some(gst::GenericFormattedValue::new(
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dest_format,
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dest_val.assume_init(),
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)),
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_ => None,
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}
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}
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}
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}
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unsafe impl<T: BaseParseImpl> IsSubclassable<T> for BaseParse {
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fn class_init(klass: &mut glib::Class<Self>) {
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Self::parent_class_init::<T>(klass);
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let klass = klass.as_mut();
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klass.start = Some(base_parse_start::<T>);
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klass.stop = Some(base_parse_stop::<T>);
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klass.set_sink_caps = Some(base_parse_set_sink_caps::<T>);
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klass.handle_frame = Some(base_parse_handle_frame::<T>);
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klass.convert = Some(base_parse_convert::<T>);
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}
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}
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unsafe extern "C" fn base_parse_start<T: BaseParseImpl>(
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ptr: *mut ffi::GstBaseParse,
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) -> glib::ffi::gboolean {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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let wrap: Borrowed<BaseParse> = from_glib_borrow(ptr);
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gst::panic_to_error!(&wrap, imp.panicked(), false, {
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match imp.start(wrap.unsafe_cast_ref()) {
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Ok(()) => true,
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Err(err) => {
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wrap.post_error_message(err);
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false
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}
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}
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})
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.into_glib()
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}
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unsafe extern "C" fn base_parse_stop<T: BaseParseImpl>(
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ptr: *mut ffi::GstBaseParse,
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) -> glib::ffi::gboolean {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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let wrap: Borrowed<BaseParse> = from_glib_borrow(ptr);
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gst::panic_to_error!(&wrap, imp.panicked(), false, {
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match imp.stop(wrap.unsafe_cast_ref()) {
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Ok(()) => true,
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Err(err) => {
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wrap.post_error_message(err);
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false
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}
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}
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})
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.into_glib()
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}
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unsafe extern "C" fn base_parse_set_sink_caps<T: BaseParseImpl>(
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ptr: *mut ffi::GstBaseParse,
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caps: *mut gst::ffi::GstCaps,
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) -> glib::ffi::gboolean {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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let wrap: Borrowed<BaseParse> = from_glib_borrow(ptr);
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let caps: Borrowed<gst::Caps> = from_glib_borrow(caps);
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gst::panic_to_error!(&wrap, imp.panicked(), false, {
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match imp.set_sink_caps(wrap.unsafe_cast_ref(), &caps) {
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Ok(()) => true,
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Err(err) => {
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err.log_with_object(&*wrap);
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false
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}
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}
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})
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.into_glib()
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}
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unsafe extern "C" fn base_parse_handle_frame<T: BaseParseImpl>(
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ptr: *mut ffi::GstBaseParse,
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frame: *mut ffi::GstBaseParseFrame,
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skipsize: *mut i32,
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) -> gst::ffi::GstFlowReturn {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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let wrap: Borrowed<BaseParse> = from_glib_borrow(ptr);
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let wrap_frame = BaseParseFrame::new(frame, &wrap);
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let res = gst::panic_to_error!(&wrap, imp.panicked(), Err(gst::FlowError::Error), {
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imp.handle_frame(wrap.unsafe_cast_ref(), wrap_frame)
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});
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match res {
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Ok((flow, skip)) => {
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*skipsize = i32::try_from(skip).expect("skip is higher than i32::MAX");
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gst::FlowReturn::from_ok(flow)
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}
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Err(flow) => gst::FlowReturn::from_error(flow),
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}
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.into_glib()
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}
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unsafe extern "C" fn base_parse_convert<T: BaseParseImpl>(
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ptr: *mut ffi::GstBaseParse,
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source_format: gst::ffi::GstFormat,
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source_value: i64,
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dest_format: gst::ffi::GstFormat,
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dest_value: *mut i64,
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) -> glib::ffi::gboolean {
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let instance = &*(ptr as *mut T::Instance);
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let imp = instance.imp();
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let wrap: Borrowed<BaseParse> = from_glib_borrow(ptr);
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let source = gst::GenericFormattedValue::new(from_glib(source_format), source_value);
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let res = gst::panic_to_error!(&wrap, imp.panicked(), None, {
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imp.convert(wrap.unsafe_cast_ref(), source, from_glib(dest_format))
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});
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match res {
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Some(dest) => {
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*dest_value = dest.into_raw_value();
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true
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}
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_ => false,
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}
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.into_glib()
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}
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