mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
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84 lines
2.9 KiB
Rust
84 lines
2.9 KiB
Rust
// This example demonstrates how to use the gstreamer crate in conjunction
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// with the future trait. The example waits for either an error to occur,
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// or for an EOS message. When a message notifying about either of both
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// is received, the future is resolved.
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extern crate gstreamer as gst;
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use gst::prelude::*;
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extern crate futures;
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use futures::executor::LocalPool;
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use futures::future;
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use futures::prelude::*;
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use futures::task::SpawnExt;
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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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// Read the pipeline to launch from the commandline, using the 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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// Create a pipeline from the launch-syntax given 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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// Use a LocalPool as executor. This runs single threaded on this very thread.
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let mut pool = LocalPool::new();
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// We use an AbortHandle for having a Future that runs forever
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// until we call handle.abort() to quit our event loop
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let (quit_handle, quit_registration) = future::AbortHandle::new_pair();
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let quit_future = future::Abortable::new(future::empty::<()>(), quit_registration).map(|_| ());
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// BusStream implements the Stream trait. Stream::for_each is calling a closure for each item
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// and returns a Future that resolves when the stream is done
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let messages = gst::BusStream::new(&bus).for_each(move |msg| {
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use gst::MessageView;
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// Determine whether we want to quit: on EOS or error message
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// we quit, otherwise simply continue.
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match msg.view() {
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MessageView::Eos(..) => quit_handle.abort(),
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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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quit_handle.abort();
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}
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_ => (),
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};
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// New future to resolve for each message: nothing here
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future::ready(())
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});
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// Spawn our message handling stream
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pool.spawner().spawn(messages).unwrap();
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// And run until something is quitting the loop, i.e. an EOS
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// or error message is received above
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pool.run_until(quit_future);
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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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}
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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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