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https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
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gstreamer: Add a MessageViewMut for mutable message access
This isn't very generally useful, but there are special cases where accessing the structure, or adding details is handy. Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/474 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1448>
This commit is contained in:
Arun Raghavan
GStreamer Marge Bot
parent
d16b28fc2f
commit
6035bffbab
2 changed files with 128 additions and 2 deletions
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@ -86,7 +86,7 @@ mod value_serde;
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mod flag_serde;
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pub mod message;
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pub use crate::message::{Message, MessageErrorDomain, MessageRef, MessageView};
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pub use crate::message::{Message, MessageErrorDomain, MessageRef, MessageView, MessageViewMut};
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pub mod structure;
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pub use crate::structure::{Structure, StructureRef};
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@ -1,6 +1,6 @@
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// Take a look at the license at the top of the repository in the LICENSE file.
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use std::{borrow::Borrow, ffi::CStr, fmt, mem, num::NonZeroU32, ops::Deref, ptr};
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use std::{borrow::Borrow, ffi::CStr, fmt, mem, num::NonZeroU32, ops::Deref, ops::DerefMut, ptr};
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use glib::{
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translate::*,
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@ -173,6 +173,57 @@ impl MessageRef {
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}
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}
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pub fn view_mut(&mut self) -> MessageViewMut {
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unsafe {
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let type_ = (*self.as_ptr()).type_;
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match type_ {
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ffi::GST_MESSAGE_EOS => Eos::view_mut(self),
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ffi::GST_MESSAGE_ERROR => Error::view_mut(self),
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ffi::GST_MESSAGE_WARNING => Warning::view_mut(self),
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ffi::GST_MESSAGE_INFO => Info::view_mut(self),
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ffi::GST_MESSAGE_TAG => Tag::view_mut(self),
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ffi::GST_MESSAGE_BUFFERING => Buffering::view_mut(self),
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ffi::GST_MESSAGE_STATE_CHANGED => StateChanged::view_mut(self),
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ffi::GST_MESSAGE_STATE_DIRTY => StateDirty::view_mut(self),
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ffi::GST_MESSAGE_STEP_DONE => StepDone::view_mut(self),
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ffi::GST_MESSAGE_CLOCK_PROVIDE => ClockProvide::view_mut(self),
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ffi::GST_MESSAGE_CLOCK_LOST => ClockLost::view_mut(self),
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ffi::GST_MESSAGE_NEW_CLOCK => NewClock::view_mut(self),
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ffi::GST_MESSAGE_STRUCTURE_CHANGE => StructureChange::view_mut(self),
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ffi::GST_MESSAGE_STREAM_STATUS => StreamStatus::view_mut(self),
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ffi::GST_MESSAGE_APPLICATION => Application::view_mut(self),
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ffi::GST_MESSAGE_ELEMENT => Element::view_mut(self),
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ffi::GST_MESSAGE_SEGMENT_START => SegmentStart::view_mut(self),
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ffi::GST_MESSAGE_SEGMENT_DONE => SegmentDone::view_mut(self),
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ffi::GST_MESSAGE_DURATION_CHANGED => DurationChanged::view_mut(self),
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ffi::GST_MESSAGE_LATENCY => Latency::view_mut(self),
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ffi::GST_MESSAGE_ASYNC_START => AsyncStart::view_mut(self),
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ffi::GST_MESSAGE_ASYNC_DONE => AsyncDone::view_mut(self),
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ffi::GST_MESSAGE_REQUEST_STATE => RequestState::view_mut(self),
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ffi::GST_MESSAGE_STEP_START => StepStart::view_mut(self),
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ffi::GST_MESSAGE_QOS => Qos::view_mut(self),
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ffi::GST_MESSAGE_PROGRESS => Progress::view_mut(self),
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ffi::GST_MESSAGE_TOC => Toc::view_mut(self),
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ffi::GST_MESSAGE_RESET_TIME => ResetTime::view_mut(self),
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ffi::GST_MESSAGE_STREAM_START => StreamStart::view_mut(self),
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ffi::GST_MESSAGE_NEED_CONTEXT => NeedContext::view_mut(self),
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ffi::GST_MESSAGE_HAVE_CONTEXT => HaveContext::view_mut(self),
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ffi::GST_MESSAGE_DEVICE_ADDED => DeviceAdded::view_mut(self),
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ffi::GST_MESSAGE_DEVICE_REMOVED => DeviceRemoved::view_mut(self),
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ffi::GST_MESSAGE_REDIRECT => Redirect::view_mut(self),
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ffi::GST_MESSAGE_PROPERTY_NOTIFY => PropertyNotify::view_mut(self),
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ffi::GST_MESSAGE_STREAM_COLLECTION => StreamCollection::view_mut(self),
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ffi::GST_MESSAGE_STREAMS_SELECTED => StreamsSelected::view_mut(self),
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#[cfg(feature = "v1_16")]
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ffi::GST_MESSAGE_DEVICE_CHANGED => DeviceChanged::view_mut(self),
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#[cfg(feature = "v1_18")]
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ffi::GST_MESSAGE_INSTANT_RATE_REQUEST => InstantRateRequest::view_mut(self),
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_ => MessageViewMut::Other,
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}
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}
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}
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#[doc(alias = "get_type")]
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#[inline]
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pub fn type_(&self) -> MessageType {
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@ -269,6 +320,55 @@ pub enum MessageView<'a> {
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Other,
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}
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#[derive(Debug)]
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#[non_exhaustive]
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pub enum MessageViewMut<'a> {
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Eos(&'a mut Eos),
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Error(&'a mut Error),
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Warning(&'a mut Warning),
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Info(&'a mut Info),
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Tag(&'a mut Tag),
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Buffering(&'a mut Buffering),
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StateChanged(&'a mut StateChanged),
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StateDirty(&'a mut StateDirty),
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StepDone(&'a mut StepDone),
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ClockProvide(&'a mut ClockProvide),
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ClockLost(&'a mut ClockLost),
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NewClock(&'a mut NewClock),
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StructureChange(&'a mut StructureChange),
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StreamStatus(&'a mut StreamStatus),
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Application(&'a mut Application),
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Element(&'a mut Element),
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SegmentStart(&'a mut SegmentStart),
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SegmentDone(&'a mut SegmentDone),
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DurationChanged(&'a mut DurationChanged),
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Latency(&'a mut Latency),
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AsyncStart(&'a mut AsyncStart),
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AsyncDone(&'a mut AsyncDone),
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RequestState(&'a mut RequestState),
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StepStart(&'a mut StepStart),
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Qos(&'a mut Qos),
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Progress(&'a mut Progress),
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Toc(&'a mut Toc),
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ResetTime(&'a mut ResetTime),
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StreamStart(&'a mut StreamStart),
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NeedContext(&'a mut NeedContext),
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HaveContext(&'a mut HaveContext),
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DeviceAdded(&'a mut DeviceAdded),
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DeviceRemoved(&'a mut DeviceRemoved),
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PropertyNotify(&'a mut PropertyNotify),
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StreamCollection(&'a mut StreamCollection),
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StreamsSelected(&'a mut StreamsSelected),
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Redirect(&'a mut Redirect),
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#[cfg(feature = "v1_16")]
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#[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
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DeviceChanged(&'a mut DeviceChanged),
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#[cfg(feature = "v1_18")]
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#[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
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InstantRateRequest(&'a mut InstantRateRequest),
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Other,
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}
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macro_rules! declare_concrete_message(
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($name:ident, $param:ident) => {
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#[repr(transparent)]
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@ -280,11 +380,22 @@ macro_rules! declare_concrete_message(
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unsafe { &*(self as *const Self as *const MessageRef) }
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}
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#[inline]
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pub fn message_mut(&mut self) -> &mut MessageRef {
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unsafe { &mut *(self as *mut Self as *mut MessageRef) }
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}
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#[inline]
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unsafe fn view(message: &MessageRef) -> MessageView<'_> {
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let message = &*(message as *const MessageRef as *const Self);
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MessageView::$name(message)
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}
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#[inline]
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unsafe fn view_mut(message: &mut MessageRef) -> MessageViewMut<'_> {
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let message = &mut *(message as *mut MessageRef as *mut Self);
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MessageViewMut::$name(message)
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}
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}
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impl Deref for $name {
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@ -298,6 +409,13 @@ macro_rules! declare_concrete_message(
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}
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}
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impl DerefMut for $name {
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#[inline]
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fn deref_mut(&mut self) -> &mut Self::Target {
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self.message_mut()
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}
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}
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impl ToOwned for $name {
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type Owned = $name<Message>;
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@ -325,6 +443,14 @@ macro_rules! declare_concrete_message(
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}
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}
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impl DerefMut for $name<Message> {
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#[inline]
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fn deref_mut(&mut self) -> &mut Self::Target {
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debug_assert!(self.0.is_writable());
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unsafe { &mut *(self.0.as_mut_ptr() as *mut Self::Target) }
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}
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}
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impl Borrow<$name> for $name<Message> {
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#[inline]
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fn borrow(&self) -> &$name {
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