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https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
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121 lines
3.9 KiB
Rust
121 lines
3.9 KiB
Rust
use gst::prelude::*;
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#[path = "../tutorials-common.rs"]
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mod tutorials_common;
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fn tutorial_main() {
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// Initialize GStreamer
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gst::init().unwrap();
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let uri =
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"https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm";
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// Create the elements
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let source = gst::ElementFactory::make("uridecodebin")
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.name("source")
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// Set the URI to play
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.property("uri", uri)
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.build()
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.expect("Could not create uridecodebin element.");
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let convert = gst::ElementFactory::make("audioconvert")
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.name("convert")
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.build()
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.expect("Could not create convert element.");
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let sink = gst::ElementFactory::make("autoaudiosink")
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.name("sink")
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.build()
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.expect("Could not create sink element.");
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let resample = gst::ElementFactory::make("audioresample")
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.name("resample")
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.build()
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.expect("Could not create resample element.");
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// Create the empty pipeline
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let pipeline = gst::Pipeline::builder().name("test-pipeline").build();
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// Build the pipeline Note that we are NOT linking the source at this
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// point. We will do it later.
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pipeline
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.add_many(&[&source, &convert, &resample, &sink])
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.unwrap();
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gst::Element::link_many(&[&convert, &resample, &sink]).expect("Elements could not be linked.");
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// Connect the pad-added signal
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source.connect_pad_added(move |src, src_pad| {
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println!("Received new pad {} from {}", src_pad.name(), src.name());
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let sink_pad = convert
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.static_pad("sink")
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.expect("Failed to get static sink pad from convert");
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if sink_pad.is_linked() {
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println!("We are already linked. Ignoring.");
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return;
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}
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let new_pad_caps = src_pad
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.current_caps()
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.expect("Failed to get caps of new pad.");
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let new_pad_struct = new_pad_caps
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.structure(0)
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.expect("Failed to get first structure of caps.");
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let new_pad_type = new_pad_struct.name();
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let is_audio = new_pad_type.starts_with("audio/x-raw");
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if !is_audio {
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println!("It has type {new_pad_type} which is not raw audio. Ignoring.");
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return;
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}
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let res = src_pad.link(&sink_pad);
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if res.is_err() {
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println!("Type is {new_pad_type} but link failed.");
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} else {
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println!("Link succeeded (type {new_pad_type}).");
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}
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});
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// Start playing
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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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// Wait until error or EOS
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let bus = pipeline.bus().unwrap();
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for msg in bus.iter_timed(gst::ClockTime::NONE) {
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use gst::MessageView;
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match msg.view() {
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MessageView::Error(err) => {
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eprintln!(
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"Error received from element {:?} {}",
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err.src().map(|s| s.path_string()),
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err.error()
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);
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eprintln!("Debugging information: {:?}", err.debug());
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break;
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}
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MessageView::StateChanged(state_changed) => {
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if state_changed.src().map(|s| s == &pipeline).unwrap_or(false) {
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println!(
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"Pipeline state changed from {:?} to {:?}",
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state_changed.old(),
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state_changed.current()
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);
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}
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}
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MessageView::Eos(..) => break,
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_ => (),
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}
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}
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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 environment on macOS
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// (but not necessary in normal Cocoa applications where this is set up automatically)
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tutorials_common::run(tutorial_main);
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}
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