gstreamer-rs/examples/src/bin/decodebin.rs

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extern crate gstreamer as gst;
use gst::prelude::*;
extern crate glib;
use std::env;
fn main() {
gst::init().unwrap();
let args: Vec<_> = env::args().collect();
let uri: &str = if args.len() == 2 {
args[1].as_ref()
} else {
panic!("Usage: decodebin file_path")
};
let pipeline = gst::Pipeline::new(None);
let src = gst::ElementFactory::make("filesrc", None).unwrap();
let decodebin = gst::ElementFactory::make("decodebin", None).unwrap();
src.set_property("location", &glib::Value::from(uri))
.unwrap();
pipeline.add_many(&[&src, &decodebin]).unwrap();
gst::Element::link_many(&[&src, &decodebin]).unwrap();
// Need to move a new reference into the closure
let pipeline_clone = pipeline.clone();
decodebin.connect_pad_added(move |_, src_pad| {
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let pipeline = &pipeline_clone;
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let (is_audio, is_video) = {
let caps = src_pad.get_current_caps().unwrap();
let structure = caps.get_structure(0).unwrap();
let name = structure.get_name();
(name.starts_with("audio/"), name.starts_with("video/"))
};
if is_audio {
let queue = gst::ElementFactory::make("queue", None).unwrap();
let convert = gst::ElementFactory::make("audioconvert", None).unwrap();
let resample = gst::ElementFactory::make("audioresample", None).unwrap();
let sink = gst::ElementFactory::make("autoaudiosink", None).unwrap();
let elements = &[&queue, &convert, &resample, &sink];
pipeline.add_many(elements).unwrap();
gst::Element::link_many(elements).unwrap();
for e in elements {
e.sync_state_with_parent().unwrap();
}
let sink_pad = queue.get_static_pad("sink").unwrap();
assert_eq!(src_pad.link(&sink_pad), gst::PadLinkReturn::Ok);
} else if is_video {
let queue = gst::ElementFactory::make("queue", None).unwrap();
let convert = gst::ElementFactory::make("videoconvert", None).unwrap();
let scale = gst::ElementFactory::make("videoscale", None).unwrap();
let sink = gst::ElementFactory::make("autovideosink", None).unwrap();
let elements = &[&queue, &convert, &scale, &sink];
pipeline.add_many(elements).unwrap();
gst::Element::link_many(elements).unwrap();
for e in elements {
e.sync_state_with_parent().unwrap();
}
let sink_pad = queue.get_static_pad("sink").unwrap();
assert_eq!(src_pad.link(&sink_pad), gst::PadLinkReturn::Ok);
}
});
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assert_ne!(
pipeline.set_state(gst::State::Playing),
gst::StateChangeReturn::Failure
);
let bus = pipeline.get_bus().unwrap();
while let Some(msg) = bus.timed_pop(gst::CLOCK_TIME_NONE) {
use gst::MessageView;
match msg.view() {
MessageView::Eos(..) => break,
MessageView::Error(err) => {
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println!(
"Error from {}: {} ({:?})",
msg.get_src().get_path_string(),
err.get_error(),
err.get_debug()
);
break;
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}
MessageView::StateChanged(s) => {
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println!(
"State changed from {}: {:?} -> {:?} ({:?})",
msg.get_src().get_path_string(),
s.get_old(),
s.get_current(),
s.get_pending()
);
}
_ => (),
}
}
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assert_ne!(
pipeline.set_state(gst::State::Null),
gst::StateChangeReturn::Failure
);
}