basetransform: confusing error message when implementing the wrong `transform_ip`
When configuring GstBaseTransfrom with:
klass.configure(
gst_base::subclass::BaseTransformMode::AlwaysInPlace,
true,
true,
);
but overriding transfrom_ip
instead of transform_ip_passthrough
, results in this slightly confusing message:
---- test_cc_data_window stdout ----
thread 'thread_name' panicked at 'Missing parent function `transform_ip`. Required because transform element operates in-place (passthrough mode)', <::std::macros::panic macros>:2:4
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:77
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1052
5: std::io::Write::write_fmt
at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libstd/io/mod.rs:1426
6: std::io::impls::<impl std::io::Write for alloc::boxed::Box<W>>::write_fmt
at src/libstd/io/impls.rs:156
7: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
8: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:49
9: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:204
10: std::panicking::default_hook
at src/libstd/panicking.rs:221
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:472
12: std::panicking::begin_panic
at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libstd/panicking.rs:399
13: <T as gstreamer_base::subclass::base_transform::BaseTransformImplExt>::parent_transform_ip_passthrough::{{closure}}
at /home/matt/Projects/gst/gst-build/subprojects/gst-plugins-rs/<::std::macros::panic macros>:2
14: core::option::Option<T>::unwrap_or_else
at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libcore/option.rs:422
15: <T as gstreamer_base::subclass::base_transform::BaseTransformImplExt>::parent_transform_ip_passthrough
at /home/matt/.cargo/git/checkouts/gstreamer-rs-79e52a2d27eb91a3/4648cf1/gstreamer-base/src/subclass/base_transform.rs:659
16: gstreamer_base::subclass::base_transform::BaseTransformImpl::transform_ip_passthrough
at /home/matt/.cargo/git/checkouts/gstreamer-rs-79e52a2d27eb91a3/4648cf1/gstreamer-base/src/subclass/base_transform.rs:135
17: gstreamer_base::subclass::base_transform::base_transform_transform_ip::{{closure}}
at /home/matt/.cargo/git/checkouts/gstreamer-rs-79e52a2d27eb91a3/4648cf1/gstreamer-base/src/subclass/base_transform.rs:1232
18: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libstd/panic.rs:318
19: std::panicking::try::do_call
at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libstd/panicking.rs:305
20: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:86
21: std::panicking::try
at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libstd/panicking.rs:281
22: std::panic::catch_unwind
at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447/src/libstd/panic.rs:394
23: gstreamer_base::subclass::base_transform::base_transform_transform_ip
at /home/matt/Projects/gst/gst-build/subprojects/gst-plugins-rs/<::gstreamer::subclass::error::gst_panic_to_error macros>:15
24: default_generate_output
at ../subprojects/gstreamer/libs/gst/base/gstbasetransform.c:2178