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https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
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78 lines
2.6 KiB
Rust
78 lines
2.6 KiB
Rust
// This is a simplified rust-reimplementation of the gst-launch-<version>
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// cli tool. It has no own parameters and simply parses the cli arguments
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// as launch syntax.
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// When the parsing succeeded, the pipeline is run until it exits.
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// Main difference between this example and the launch example is the use of
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// GLib's main loop to operate GStreamer's bus. This allows to also do other
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// things from the main loop (timeouts, UI events, socket events, ...) instead
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// of just handling messages from GStreamer's bus.
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extern crate gstreamer as gst;
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use gst::prelude::*;
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extern crate glib;
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use std::env;
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#[path = "../examples-common.rs"]
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mod examples_common;
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fn example_main() {
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// Get a string containing the passed pipeline launch syntax
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let pipeline_str = env::args().collect::<Vec<String>>()[1..].join(" ");
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gst::init().unwrap();
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// Like teasered above, we use GLib's main loop to operate GStreamer's bus.
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let main_loop = glib::MainLoop::new(None, false);
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// Let GStreamer create a pipeline from the parsed launch syntax on the cli.
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let pipeline = gst::parse_launch(&pipeline_str).unwrap();
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let bus = pipeline.get_bus().unwrap();
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pipeline
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.set_state(gst::State::Playing)
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.expect("Unable to set the pipeline to the `Playing` state");
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let main_loop_clone = main_loop.clone();
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//bus.add_signal_watch();
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//bus.connect_message(move |_, msg| {
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bus.add_watch(move |_, msg| {
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use gst::MessageView;
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let main_loop = &main_loop_clone;
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match msg.view() {
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MessageView::Eos(..) => main_loop.quit(),
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MessageView::Error(err) => {
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println!(
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"Error from {:?}: {} ({:?})",
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err.get_src().map(|s| s.get_path_string()),
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err.get_error(),
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err.get_debug()
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);
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main_loop.quit();
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}
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_ => (),
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};
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glib::Continue(true)
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});
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main_loop.run();
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pipeline
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.set_state(gst::State::Null)
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.expect("Unable to set the pipeline to the `Null` state");
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// Here we remove the bus watch we added above. This avoids a memory leak, that might
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// otherwise happen because we moved a strong reference (clone of main_loop) into the
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// callback closure above.
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bus.remove_watch().unwrap();
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}
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fn main() {
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// tutorials_common::run is only required to set up the application environent on macOS
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// (but not necessary in normal Cocoa applications where this is set up autmatically)
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examples_common::run(example_main);
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}
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