This reduces their size to 4 bytes instead of 5 bytes, and as such makes
it possible to store them in a register on 32 bit platforms too.
Additionally it makes it possible for enums like
`Result<FlowSuccess, FlowReturn>` to be stored in a single register on
64 bit platforms.
Also the conversions between the C and Rust type is a simple copy of the
value now instead of a mapping.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1200>
As a side-effect, this also now includes the element factory name in the
error messages instead of giving the same error string for every
factory.
Partially fixes https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/318
Also let them all go through the same, single object construction code.
Introduce a set of Constructor traits which are implemented on
integer of float depending on the formatted values. This traits
allows building formatted values using expressions such as:
```rust
let buffer_nb = 20.buffers();
let size = 42.k_bytes();
let duration = 15.minutes() + 30.seconds();
let quantity = 42.default_format();
let progress = 20.percent();
let progress = 0.2.percent_ratio();
```
The functions `into_{signed,positive,negative}` used to be implemented
on the `FormattedValue` trait for convenience. This was wrong for the
following reasons:
- They aren't specific to `FormattedValue`s: they can also be
implemented for regular unsigned integers such as `u64`, `usize` or
`u32`.
- They were implemented for `format::Undefined` and all variants of
`GenericFormattedValue`, some of which are already signed.
This commit introduces the new trait `UnsignedIntoSigned`, which makes
it possible to fix both of the above problems.
Users can build a `Signed` from an `Undefined`, an `i64`, `isize` or
`i32` thanks to the `From` trait implementations.
When I introduced the 'ser_de' feature, I couldn't find a way to
name it 'serde' while also make it pull the optional 'serde'
crate together with the other related dependencies.
With rustc >= 1.60 we can use 'dep:serde' to refer to the 'serde'
dependency as part of the 'serde' feature.
Functions such as Segment::to_running_time_full replicate the C
signature for the return type: an integer indicates whether the
resulting value must be interpreted as positive or negative.
In Rust, alternatives are usually represented using an enum.
This commit implements an enum wrapper to represent the sign
and adds functions to FormattedValue to ease Signed handling.
The trait CompatibleFormattedValue can be used to check argument
compatibility to a certain Format. This is convenient to define
function which accept several FormattedValues which must hold
values of the same Format.
This trait enforces format compatibility at compilation time for
SpecificFormattedValues and at runtime when a GenericFormattedValue
is provided.
See https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1059
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
And only allow setting documentation caps via that. It's not actually
allowed to update the documentation caps at random times as it is not
thread-safe.
Represents combinations of flags with a '+' separated string of nicks,
or an empty string for no flags set.
Note that most flag types will ignore any flags using multiple bits when
serializing, since in most cases these flags cover all used bits.
