GPS: add GStreamer support

Can now get the GStreamer element's list
from the registry.

Cargo.lock

@@ -16,7 +16,7 @@ checksum = "a83b21d2aa75e464db56225e1bda2dd5993311ba1095acaa8fa03d1ae67026ba"
 dependencies = [
  "atk-sys",
  "bitflags",
- "glib",
+ "glib 0.14.8",
  "libc",
 ]
 
@@ -26,10 +26,10 @@ version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "badcf670157c84bb8b1cf6b5f70b650fed78da2033c9eed84c4e49b11cbe83ea"
 dependencies = [
- "glib-sys",
+ "glib-sys 0.14.0",
- "gobject-sys",
+ "gobject-sys 0.14.0",
  "libc",
- "system-deps",
+ "system-deps 3.2.0",
 ]
 
 [[package]]
@@ -52,7 +52,7 @@ checksum = "9164355c892b026d6257e696dde5f3cb39beb3718297f0f161b562fe2ee3ab86"
 dependencies = [
  "bitflags",
  "cairo-sys-rs",
- "glib",
+ "glib 0.14.8",
  "libc",
  "thiserror",
 ]
@@ -63,9 +63,9 @@ version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d7c9c3928781e8a017ece15eace05230f04b647457d170d2d9641c94a444ff80"
 dependencies = [
- "glib-sys",
+ "glib-sys 0.14.0",
  "libc",
- "system-deps",
+ "system-deps 3.2.0",
 ]
 
 [[package]]
@@ -77,6 +77,12 @@ dependencies = [
  "smallvec",
 ]
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "either"
 version = "1.6.1"
@@ -125,6 +131,19 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "522de2a0fe3e380f1bc577ba0474108faf3f6b18321dbf60b3b9c39a75073377"
 
+[[package]]
+name = "futures-macro"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18e4a4b95cea4b4ccbcf1c5675ca7c4ee4e9e75eb79944d07defde18068f79bb"
+dependencies = [
+ "autocfg",
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "futures-task"
 version = "0.3.17"
@@ -139,9 +158,12 @@ checksum = "36568465210a3a6ee45e1f165136d68671471a501e632e9a98d96872222b5481"
 dependencies = [
  "autocfg",
  "futures-core",
+ "futures-macro",
  "futures-task",
  "pin-project-lite",
  "pin-utils",
+ "proc-macro-hack",
+ "proc-macro-nested",
  "slab",
 ]
 
@@ -156,7 +178,7 @@ dependencies = [
  "gdk-pixbuf",
  "gdk-sys",
  "gio",
- "glib",
+ "glib 0.14.8",
  "libc",
  "pango",
 ]
@@ -169,7 +191,7 @@ checksum = "534192cb8f01daeb8fab2c8d4baa8f9aae5b7a39130525779f5c2608e235b10f"
 dependencies = [
  "gdk-pixbuf-sys",
  "gio",
- "glib",
+ "glib 0.14.8",
  "libc",
 ]
 
@@ -180,10 +202,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f097c0704201fbc8f69c1762dc58c6947c8bb188b8ed0bc7e65259f1894fe590"
 dependencies = [
  "gio-sys",
- "glib-sys",
+ "glib-sys 0.14.0",
- "gobject-sys",
+ "gobject-sys 0.14.0",
  "libc",
- "system-deps",
+ "system-deps 3.2.0",
 ]
 
 [[package]]
@@ -195,12 +217,12 @@ dependencies = [
  "cairo-sys-rs",
  "gdk-pixbuf-sys",
  "gio-sys",
- "glib-sys",
+ "glib-sys 0.14.0",
- "gobject-sys",
+ "gobject-sys 0.14.0",
  "libc",
  "pango-sys",
  "pkg-config",
- "system-deps",
+ "system-deps 3.2.0",
 ]
 
 [[package]]
@@ -214,7 +236,7 @@ dependencies = [
  "futures-core",
  "futures-io",
  "gio-sys",
- "glib",
+ "glib 0.14.8",
  "libc",
  "once_cell",
  "thiserror",
@@ -226,13 +248,32 @@ version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0a41df66e57fcc287c4bcf74fc26b884f31901ea9792ec75607289b456f48fa"
 dependencies = [
- "glib-sys",
+ "glib-sys 0.14.0",
- "gobject-sys",
+ "gobject-sys 0.14.0",
  "libc",
- "system-deps",
+ "system-deps 3.2.0",
  "winapi",
 ]
 
+[[package]]
+name = "glib"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c685013b7515e668f1b57a165b009d4d28cb139a8a989bbd699c10dad29d0c5"
+dependencies = [
+ "bitflags",
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-task",
+ "futures-util",
+ "glib-macros 0.10.1",
+ "glib-sys 0.10.1",
+ "gobject-sys 0.10.0",
+ "libc",
+ "once_cell",
+]
+
 [[package]]
 name = "glib"
 version = "0.14.8"
@@ -244,14 +285,30 @@ dependencies = [
  "futures-core",
  "futures-executor",
  "futures-task",
- "glib-macros",
+ "glib-macros 0.14.1",
- "glib-sys",
+ "glib-sys 0.14.0",
- "gobject-sys",
+ "gobject-sys 0.14.0",
  "libc",
  "once_cell",
  "smallvec",
 ]
 
+[[package]]
+name = "glib-macros"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41486a26d1366a8032b160b59065a59fb528530a46a49f627e7048fb8c064039"
+dependencies = [
+ "anyhow",
+ "heck",
+ "itertools 0.9.0",
+ "proc-macro-crate 0.1.5",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "glib-macros"
 version = "0.14.1"
@@ -260,13 +317,23 @@ checksum = "2aad66361f66796bfc73f530c51ef123970eb895ffba991a234fcf7bea89e518"
 dependencies = [
  "anyhow",
  "heck",
- "proc-macro-crate",
+ "proc-macro-crate 1.1.0",
  "proc-macro-error",
  "proc-macro2",
  "quote",
  "syn",
 ]
 
+[[package]]
+name = "glib-sys"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7e9b997a66e9a23d073f2b1abb4dbfc3925e0b8952f67efd8d9b6e168e4cdc1"
+dependencies = [
+ "libc",
+ "system-deps 1.3.2",
+]
+
 [[package]]
 name = "glib-sys"
 version = "0.14.0"
@@ -274,7 +341,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1c1d60554a212445e2a858e42a0e48cece1bd57b311a19a9468f70376cf554ae"
 dependencies = [
  "libc",
- "system-deps",
+ "system-deps 3.2.0",
+]
+
+[[package]]
+name = "gobject-sys"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "952133b60c318a62bf82ee75b93acc7e84028a093e06b9e27981c2b6fe68218c"
+dependencies = [
+ "glib-sys 0.10.1",
+ "libc",
+ "system-deps 1.3.2",
 ]
 
 [[package]]
@@ -283,9 +361,9 @@ version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa92cae29759dae34ab5921d73fff5ad54b3d794ab842c117e36cafc7994c3f5"
 dependencies = [
- "glib-sys",
+ "glib-sys 0.14.0",
  "libc",
- "system-deps",
+ "system-deps 3.2.0",
 ]
 
 [[package]]
@@ -293,9 +371,46 @@ name = "gst_pipeline_studio"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "gstreamer",
  "gtk",
 ]
 
+[[package]]
+name = "gstreamer"
+version = "0.16.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ff5d0f7ff308ae37e6eb47b6ded17785bdea06e438a708cd09e0288c1862f33"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "futures-channel",
+ "futures-core",
+ "futures-util",
+ "glib 0.10.3",
+ "glib-sys 0.10.1",
+ "gobject-sys 0.10.0",
+ "gstreamer-sys",
+ "libc",
+ "muldiv",
+ "num-rational",
+ "once_cell",
+ "paste",
+ "pretty-hex",
+ "thiserror",
+]
+
+[[package]]
+name = "gstreamer-sys"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc1f154082d01af5718c5f8a8eb4f565a4ea5586ad8833a8fc2c2aa6844b601d"
+dependencies = [
+ "glib-sys 0.10.1",
+ "gobject-sys 0.10.0",
+ "libc",
+ "system-deps 1.3.2",
+]
+
 [[package]]
 name = "gtk"
 version = "0.14.3"
@@ -310,7 +425,7 @@ dependencies = [
  "gdk",
  "gdk-pixbuf",
  "gio",
- "glib",
+ "glib 0.14.8",
  "gtk-sys",
  "gtk3-macros",
  "libc",
@@ -330,11 +445,11 @@ dependencies = [
  "gdk-pixbuf-sys",
  "gdk-sys",
  "gio-sys",
- "glib-sys",
+ "glib-sys 0.14.0",
- "gobject-sys",
+ "gobject-sys 0.14.0",
  "libc",
  "pango-sys",
- "system-deps",
+ "system-deps 3.2.0",
 ]
 
 [[package]]
@@ -345,7 +460,7 @@ checksum = "21de1da96dc117443fb03c2e270b2d34b7de98d0a79a19bbb689476173745b79"
 dependencies = [
  "anyhow",
  "heck",
- "proc-macro-crate",
+ "proc-macro-crate 1.1.0",
  "proc-macro-error",
  "proc-macro2",
  "quote",
@@ -361,6 +476,15 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.1"
@@ -385,6 +509,42 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "muldiv"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0419348c027fa7be448d2ae7ea0e4e04c2334c31dc4e74ab29f00a2a7ca69204"
+
+[[package]]
+name = "num-integer"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12ac428b1cb17fce6f731001d307d351ec70a6d202fc2e60f7d4c5e42d8f4f07"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.8.0"
@@ -398,7 +558,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "546fd59801e5ca735af82839007edd226fe7d3bb06433ec48072be4439c28581"
 dependencies = [
  "bitflags",
- "glib",
+ "glib 0.14.8",
  "libc",
  "once_cell",
  "pango-sys",
@@ -410,12 +570,18 @@ version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2367099ca5e761546ba1d501955079f097caa186bb53ce0f718dca99ac1942fe"
 dependencies = [
- "glib-sys",
+ "glib-sys 0.14.0",
- "gobject-sys",
+ "gobject-sys 0.14.0",
  "libc",
- "system-deps",
+ "system-deps 3.2.0",
 ]
 
+[[package]]
+name = "paste"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0744126afe1a6dd7f394cb50a716dbe086cb06e255e53d8d0185d82828358fb5"
+
 [[package]]
 name = "pest"
 version = "2.1.3"
@@ -443,6 +609,21 @@ version = "0.3.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c9b1041b4387893b91ee6746cddfc28516aff326a3519fb2adf820932c5e6cb"
 
+[[package]]
+name = "pretty-hex"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc5c99d529f0d30937f6f4b8a86d988047327bb88d04d2c4afc356de74722131"
+
+[[package]]
+name = "proc-macro-crate"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d6ea3c4595b96363c13943497db34af4460fb474a95c43f4446ad341b8c9785"
+dependencies = [
+ "toml",
+]
+
 [[package]]
 name = "proc-macro-crate"
 version = "1.1.0"
@@ -477,6 +658,18 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
+
+[[package]]
+name = "proc-macro-nested"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc881b2c22681370c6a780e47af9840ef841837bc98118431d4e1868bd0c1086"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.30"
@@ -540,12 +733,30 @@ version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ecab6c735a6bb4139c0caafd0cc3635748bbb3acf4550e8138122099251f309"
 
+[[package]]
+name = "strum"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57bd81eb48f4c437cadc685403cad539345bf703d78e63707418431cecd4522b"
+
 [[package]]
 name = "strum"
 version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aaf86bbcfd1fa9670b7a129f64fc0c9fcbbfe4f1bc4210e9e98fe71ffc12cde2"
 
+[[package]]
+name = "strum_macros"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87c85aa3f8ea653bfd3ddf25f7ee357ee4d204731f6aa9ad04002306f6e2774c"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "strum_macros"
 version = "0.21.1"
@@ -569,6 +780,21 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "system-deps"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f3ecc17269a19353b3558b313bba738b25d82993e30d62a18406a24aba4649b"
+dependencies = [
+ "heck",
+ "pkg-config",
+ "strum 0.18.0",
+ "strum_macros 0.18.0",
+ "thiserror",
+ "toml",
+ "version-compare 0.0.10",
+]
+
 [[package]]
 name = "system-deps"
 version = "3.2.0"
@@ -578,13 +804,13 @@ dependencies = [
  "anyhow",
  "cfg-expr",
  "heck",
- "itertools",
+ "itertools 0.10.1",
  "pkg-config",
- "strum",
+ "strum 0.21.0",
- "strum_macros",
+ "strum_macros 0.21.1",
  "thiserror",
  "toml",
- "version-compare",
+ "version-compare 0.0.11",
 ]
 
 [[package]]
@@ -634,6 +860,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
+[[package]]
+name = "version-compare"
+version = "0.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d63556a25bae6ea31b52e640d7c41d1ab27faba4ccb600013837a3d0b3994ca1"
+
 [[package]]
 name = "version-compare"
 version = "0.0.11"

Cargo.toml

@@ -8,3 +8,4 @@ edition = "2018"
 [dependencies]
 gtk = "0.14.3"
 anyhow = "1"
+gstreamer = "0.16"

src/main.rs

@@ -18,7 +18,7 @@
 //
 // SPDX-License-Identifier: GPL-3.0-only
 mod mainwindow;
-
+mod pipeline;
 use gtk::prelude::*;
 
 fn main() {

src/mainwindow.rs

@@ -8,6 +8,7 @@ use gtk::{
 use std::cell::RefCell;
 use std::rc::Rc;
 
+use crate::pipeline::Pipeline;
 #[derive(Debug, Clone, Default)]
 struct Element {
     name: String,
@@ -72,6 +73,8 @@ pub fn build_ui(application: &gtk::Application) {
         .expect("Couldn't get window");
     add_button.connect_clicked(glib::clone!(@weak window => move |_| {
         // entry.set_text("Clicked!");
+        let pipeline = Pipeline::new();
+        Pipeline::get_elements_list().expect("cocuou");
         add_dialog.connect_response(|dialog, _| dialog.close());
         add_dialog.show_all();
     }));

src/pipeline.rs

@@ -0,0 +1,77 @@
+// pipeline.rs
+//
+// Copyright 2021 Stéphane Cerveau <scerveau@collabora.com>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// SPDX-License-Identifier: GPL-3.0-only
+use gst::prelude::*;
+use gstreamer as gst;
+use std::error;
+
+#[derive(Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub struct ElementInfo {
+    pub name: Option<String>,
+    plugin_name: Option<String>,
+    rank: i32,
+}
+
+impl Default for ElementInfo {
+    fn default() -> ElementInfo {
+        ElementInfo {
+            name: None,
+            plugin_name: None,
+            rank: -1,
+        }
+    }
+}
+
+pub struct Pipeline {
+    initialized: bool,
+}
+
+impl Default for Pipeline {
+    fn default() -> Pipeline {
+        Pipeline { initialized: false }
+    }
+}
+
+impl Pipeline {
+    pub fn new() -> Result<Self, Box<dyn error::Error>> {
+        gst::init()?;
+        Ok(Self { initialized: true })
+    }
+
+    pub fn elements_list() -> Result<Vec<ElementInfo>, Box<dyn error::Error>> {
+        let registry = gst::Registry::get();
+        let mut elements: Vec<ElementInfo> = Vec::new();
+        let plugins = gst::Registry::get_plugin_list(&registry);
+        for plugin in plugins {
+            let plugin_name = gst::Plugin::get_plugin_name(&plugin);
+            let features = gst::Registry::get_feature_list_by_plugin(&registry, &plugin_name);
+            for feature in features {
+                let mut element = ElementInfo::default();
+                if let Ok(factory) = feature.downcast::<gst::ElementFactory>() {
+                    let feature = factory.upcast::<gst::PluginFeature>();
+
+                    element.name = Some(gst::PluginFeature::get_name(&feature).as_str().to_owned());
+                    element.plugin_name =
+                        Some(gst::Plugin::get_plugin_name(&plugin).as_str().to_owned());
+                    elements.push(element);
+                }
+            }
+        }
+        Ok(elements)
+    }
+}