mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-09-24 13:00:12 +00:00
206 lines
6.2 KiB
Rust
206 lines
6.2 KiB
Rust
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// Copyright (C) 2024 Collabora Ltd
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// @author: Olivier Crête <olivier.crete@collabora.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
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// If a copy of the MPL was not distributed with this file, You can obtain one at
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// <https://mozilla.org/MPL/2.0/>.
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//
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// SPDX-License-Identifier: MPL-2.0
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use gst::glib;
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use gst::prelude::*;
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use gst::subclass::prelude::*;
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use crate::originalbuffermeta::OriginalBufferMeta;
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pub struct OriginalBufferSave {
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src_pad: gst::Pad,
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sink_pad: gst::Pad,
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}
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use once_cell::sync::Lazy;
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#[cfg(unused_code)]
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"originalbuffersave",
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gst::DebugColorFlags::empty(),
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Some("Save Original buffer as meta"),
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)
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});
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#[glib::object_subclass]
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impl ObjectSubclass for OriginalBufferSave {
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const NAME: &'static str = "GstOriginalBufferSave";
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type Type = super::OriginalBufferSave;
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type ParentType = gst::Element;
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fn with_class(klass: &Self::Class) -> Self {
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let sink_templ = klass.pad_template("sink").unwrap();
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let src_templ = klass.pad_template("src").unwrap();
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let sink_pad = gst::Pad::builder_from_template(&sink_templ)
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.chain_function(|pad, parent, buffer| {
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OriginalBufferSave::catch_panic_pad_function(
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parent,
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|| Err(gst::FlowError::Error),
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|obj| obj.sink_chain(pad, buffer),
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)
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})
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.query_function(|pad, parent, query| {
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OriginalBufferSave::catch_panic_pad_function(
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parent,
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|| false,
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|obj| obj.sink_query(pad, parent, query),
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)
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})
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.flags(gst::PadFlags::PROXY_CAPS | gst::PadFlags::PROXY_ALLOCATION)
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.build();
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let src_pad = gst::Pad::builder_from_template(&src_templ)
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.event_function(|pad, parent, event| {
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OriginalBufferSave::catch_panic_pad_function(
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parent,
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|| false,
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|obj| obj.src_event(pad, parent, event),
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)
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})
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.build();
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Self { src_pad, sink_pad }
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}
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}
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impl ObjectImpl for OriginalBufferSave {
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fn constructed(&self) {
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self.parent_constructed();
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let obj = self.obj();
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obj.add_pad(&self.sink_pad).unwrap();
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obj.add_pad(&self.src_pad).unwrap();
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}
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}
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impl GstObjectImpl for OriginalBufferSave {}
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impl ElementImpl for OriginalBufferSave {
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fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
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static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
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gst::subclass::ElementMetadata::new(
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"Original Buffer Save",
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"Generic",
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"Saves a reference to the buffer in a meta",
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"Olivier Crête <olivier.crete@collabora.com>",
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)
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});
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Some(&*ELEMENT_METADATA)
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}
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fn pad_templates() -> &'static [gst::PadTemplate] {
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static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
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let caps = gst::Caps::new_any();
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let src_pad_template = gst::PadTemplate::new(
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"src",
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gst::PadDirection::Src,
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gst::PadPresence::Always,
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&caps,
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)
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.unwrap();
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let sink_pad_template = gst::PadTemplate::new(
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"sink",
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gst::PadDirection::Sink,
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gst::PadPresence::Always,
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&caps,
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)
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.unwrap();
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vec![src_pad_template, sink_pad_template]
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});
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PAD_TEMPLATES.as_ref()
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}
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}
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impl OriginalBufferSave {
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fn forward_query(&self, query: gst::Query) -> Option<gst::Query> {
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let mut s = gst::Structure::new_empty("gst-original-buffer-forward-query");
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s.set("query", query);
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let mut query = gst::query::Custom::new(s);
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if self.src_pad.peer_query(&mut query) {
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let s = query.structure_mut();
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if let (Ok(true), Ok(q)) = (s.get("result"), s.get::<gst::Query>("query")) {
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Some(q)
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} else {
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None
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}
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} else {
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None
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}
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}
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fn sink_chain(
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&self,
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pad: &gst::Pad,
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inbuf: gst::Buffer,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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let mut buf = inbuf.copy();
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let caps = pad.current_caps();
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if let Some(mut meta) = buf.make_mut().meta_mut::<OriginalBufferMeta>() {
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meta.replace(inbuf, caps);
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} else {
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OriginalBufferMeta::add(buf.make_mut(), inbuf, caps);
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}
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self.src_pad.push(buf)
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}
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fn sink_query(
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&self,
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pad: &gst::Pad,
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parent: Option<&impl IsA<gst::Object>>,
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query: &mut gst::QueryRef,
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) -> bool {
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let ret = gst::Pad::query_default(pad, parent, query);
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if !ret {
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return ret;
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}
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if let gst::QueryViewMut::Caps(q) = query.view_mut() {
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if let Some(caps) = q.result_owned() {
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let forwarding_q = gst::query::Caps::new(Some(&caps)).into();
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if let Some(forwarding_q) = self.forward_query(forwarding_q) {
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if let gst::QueryView::Caps(c) = forwarding_q.view() {
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let res = c
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.result_owned()
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.map(|c| c.intersect_with_mode(&caps, gst::CapsIntersectMode::First));
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q.set_result(&res);
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}
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}
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}
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}
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// We should also do allocation queries, but that requires supporting the same
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// intersection semantics as gsttee, which should be in a helper function.
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true
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}
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fn src_event(
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&self,
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pad: &gst::Pad,
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parent: Option<&impl IsA<gst::Object>>,
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event: gst::Event,
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) -> bool {
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let event = if event.has_name("gst-original-buffer-forward-upstream-event") {
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event.structure().unwrap().get("event").unwrap()
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} else {
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event
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};
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gst::Pad::event_default(pad, parent, event)
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}
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}
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