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https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
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66030f36ad
This tracer measures the time it takes for a buffer/buffer list push to return. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1506>
346 lines
9.1 KiB
Rust
346 lines
9.1 KiB
Rust
// Copyright (C) 2024 Sebastian Dröge <sebastian@centricular.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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/**
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* tracer-pad-push-timings:
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*
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* This tracer measures how long it takes to push a buffer or buffer list out of a pad.
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*
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* Example:
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*
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* ```console
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* $ GST_TRACERS='pad-push-timings(file="/tmp/pad_push_timings.log")' gst-launch-1.0 audiotestsrc ! queue ! fakesink
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* ```
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*
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* The generated file is a CSV file of the format
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*
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* ```csv
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* timestamp,element:pad name,pad pointer,push duration
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* ```
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*
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* ## Parameters
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*
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* ### `file`
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*
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* Specifies the path to the file that will collect the CSV file with the push timings.
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*
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* By default the file is written to `/tmp/pad_push_timings.log`.
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*
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* ### `include-filter`
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*
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* Specifies a regular expression for the `element:pad` names that should be included.
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*
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* By default this is not set.
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*
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* ### `exclude-filter`
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*
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* Specifies a regular expression for the `element:pad` names that should **not** be included.
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*
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* By default this is not set.
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*/
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use std::collections::HashMap;
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use std::path::PathBuf;
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use std::str::FromStr;
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use std::sync::{Arc, Mutex};
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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 once_cell::sync::Lazy;
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use regex::Regex;
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"pad-push-timings",
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gst::DebugColorFlags::empty(),
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Some("Tracer to pad push timings"),
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)
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});
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#[derive(Debug)]
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struct Settings {
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file: PathBuf,
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include_filter: Option<Regex>,
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exclude_filter: Option<Regex>,
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}
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impl Default for Settings {
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fn default() -> Self {
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let mut file = glib::tmp_dir();
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file.push("pad_push_timings.log");
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Self {
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file,
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include_filter: None,
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exclude_filter: None,
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}
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}
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}
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impl Settings {
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fn update_from_params(&mut self, imp: &PadPushTimings, params: String) {
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let s = match gst::Structure::from_str(&format!("pad-push-timings,{params}")) {
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Ok(s) => s,
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Err(err) => {
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gst::warning!(CAT, imp: imp, "failed to parse tracer parameters: {}", err);
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return;
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}
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};
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if let Ok(file) = s.get::<&str>("file") {
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gst::log!(CAT, imp: imp, "file= {}", file);
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self.file = PathBuf::from(file);
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}
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if let Ok(filter) = s.get::<&str>("include-filter") {
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gst::log!(CAT, imp: imp, "include filter= {}", filter);
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let filter = match Regex::new(filter) {
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Ok(filter) => Some(filter),
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Err(err) => {
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gst::error!(
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CAT,
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imp: imp,
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"Failed to compile include-filter regex: {}",
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err
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);
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None
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}
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};
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self.include_filter = filter;
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}
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if let Ok(filter) = s.get::<&str>("exclude-filter") {
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gst::log!(CAT, imp: imp, "exclude filter= {}", filter);
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let filter = match Regex::new(filter) {
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Ok(filter) => Some(filter),
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Err(err) => {
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gst::error!(
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CAT,
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imp: imp,
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"Failed to compile exclude-filter regex: {}",
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err
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);
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None
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}
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};
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self.exclude_filter = filter;
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}
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}
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}
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#[derive(Default)]
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struct State {
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pads: HashMap<usize, Pad>,
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log: Vec<LogLine>,
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settings: Settings,
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}
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struct Pad {
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parent_name: Option<Arc<glib::GString>>,
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pad_name: Arc<glib::GString>,
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pending_push_start: Option<u64>,
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include: bool,
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}
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struct LogLine {
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timestamp: u64,
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parent_name: Option<Arc<glib::GString>>,
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pad_name: Arc<glib::GString>,
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ptr: usize,
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push_duration: u64,
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}
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#[derive(Default)]
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pub struct PadPushTimings {
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state: Mutex<State>,
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}
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#[glib::object_subclass]
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impl ObjectSubclass for PadPushTimings {
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const NAME: &'static str = "GstPadPushTimings";
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type Type = super::PadPushTimings;
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type ParentType = gst::Tracer;
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}
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impl ObjectImpl for PadPushTimings {
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fn constructed(&self) {
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self.parent_constructed();
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if let Some(params) = self.obj().property::<Option<String>>("params") {
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let mut state = self.state.lock().unwrap();
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state.settings.update_from_params(self, params);
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}
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self.register_hook(TracerHook::PadPushPre);
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self.register_hook(TracerHook::PadPushListPre);
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self.register_hook(TracerHook::PadPushPost);
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self.register_hook(TracerHook::PadPushListPost);
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self.register_hook(TracerHook::ObjectDestroyed);
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}
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fn dispose(&self) {
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use std::io::prelude::*;
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let state = self.state.lock().unwrap();
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let mut file = match std::fs::File::create(&state.settings.file) {
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Ok(file) => file,
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Err(err) => {
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gst::error!(CAT, imp: self, "Failed to create file: {err}");
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return;
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}
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};
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gst::debug!(
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CAT,
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imp: self,
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"Writing file {}",
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state.settings.file.display()
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);
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for LogLine {
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timestamp,
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parent_name,
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pad_name,
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ptr,
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push_duration,
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} in &state.log
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{
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let res = if let Some(parent_name) = parent_name {
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writeln!(
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&mut file,
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"{timestamp},{parent_name}:{pad_name},0x{ptr:08x},{push_duration}"
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)
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} else {
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writeln!(
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&mut file,
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"{timestamp},:{pad_name},0x{ptr:08x},{push_duration}"
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)
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};
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if let Err(err) = res {
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gst::error!(CAT, imp: self, "Failed to write to file: {err}");
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return;
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}
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}
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}
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}
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impl GstObjectImpl for PadPushTimings {}
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impl TracerImpl for PadPushTimings {
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fn pad_push_pre(&self, ts: u64, pad: &gst::Pad, _buffer: &gst::Buffer) {
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self.push_pre(ts, pad);
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}
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fn pad_push_list_pre(&self, ts: u64, pad: &gst::Pad, _list: &gst::BufferList) {
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self.push_pre(ts, pad);
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}
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fn pad_push_post(
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&self,
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ts: u64,
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pad: &gst::Pad,
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_result: Result<gst::FlowSuccess, gst::FlowError>,
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) {
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self.push_post(ts, pad);
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}
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fn pad_push_list_post(
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&self,
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ts: u64,
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pad: &gst::Pad,
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_result: Result<gst::FlowSuccess, gst::FlowError>,
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) {
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self.push_post(ts, pad);
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}
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fn object_destroyed(&self, _ts: u64, object: std::ptr::NonNull<gst::ffi::GstObject>) {
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let ptr = object.as_ptr() as usize;
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let mut state = self.state.lock().unwrap();
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state.pads.remove(&ptr);
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}
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}
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impl PadPushTimings {
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fn push_pre(&self, ts: u64, pad: &gst::Pad) {
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let ptr = pad.as_ptr() as usize;
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let mut state = self.state.lock().unwrap();
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let State {
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ref mut pads,
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ref settings,
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..
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} = &mut *state;
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let pad = pads.entry(ptr).or_insert_with(|| {
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let parent_name = pad.parent().map(|p| p.name());
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let pad_name = pad.name();
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let mut include = true;
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let name = if let Some(ref parent_name) = parent_name {
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format!("{}:{}", parent_name, pad_name)
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} else {
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format!(":{}", pad_name)
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};
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if let Some(ref filter) = settings.include_filter {
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if !filter.is_match(&name) {
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include = false;
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}
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}
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if let Some(ref filter) = settings.exclude_filter {
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if filter.is_match(&name) {
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include = false;
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}
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}
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Pad {
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parent_name: parent_name.map(Arc::new),
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pad_name: Arc::new(pad_name),
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pending_push_start: None,
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include,
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}
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});
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if !pad.include {
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return;
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}
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assert!(pad.pending_push_start.is_none());
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pad.pending_push_start = Some(ts);
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}
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fn push_post(&self, ts: u64, pad: &gst::Pad) {
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let ptr = pad.as_ptr() as usize;
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let mut state = self.state.lock().unwrap();
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let State {
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ref mut pads,
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ref mut log,
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..
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} = &mut *state;
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let Some(pad) = pads.get_mut(&ptr) else {
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return;
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};
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if !pad.include {
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return;
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}
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let push_start = pad.pending_push_start.take().unwrap();
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log.push(LogLine {
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timestamp: push_start,
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parent_name: pad.parent_name.clone(),
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pad_name: pad.pad_name.clone(),
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ptr,
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push_duration: ts - push_start,
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});
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}
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}
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