Commit 594418e1 authored by Sebastian Dröge's avatar Sebastian Dröge 🍵
Browse files

Add appsink example

parent dc640249
extern crate gstreamer as gst;
use gst::*;
extern crate gstreamer_app as gst_app;
use gst_app::*;
extern crate glib;
use glib::*;
use std::u64;
use std::i16;
use std::i32;
fn main() {
gst::init().unwrap();
let pipeline = gst::Pipeline::new(None);
let src = gst::ElementFactory::make("audiotestsrc", None).unwrap();
let sink = gst::ElementFactory::make("appsink", None).unwrap();
pipeline.add_many(&[&src, &sink]).unwrap();
gst::Element::link_many(&[&src, &sink]).unwrap();
let appsink = sink.clone().dynamic_cast::<AppSink>().unwrap();
appsink.set_caps(&Caps::new_simple(
"audio/x-raw",
&[
(&"format", &"S16BE"),
(&"layout", &"interleaved"),
(&"channels", &(1i32)),
(&"rate", &IntRange::<i32>::new(1, i32::MAX)),
],
));
appsink.set_callbacks(AppSinkCallbacks::new(
/* eos */
|_| {},
/* new_preroll */
|_| FlowReturn::Ok,
/* new_samples */
|appsink| {
let sample = match appsink.pull_sample() {
None => return FlowReturn::Eos,
Some(sample) => sample,
};
let buffer = sample.get_buffer().unwrap();
assert_eq!(buffer.get_size() % 2, 0);
let map = buffer.map_read().unwrap();
let data = map.as_slice();
let sum: f64 = data.chunks(2)
.map(|sample| {
let u: u16 = ((sample[0] as u16) << 8) | (sample[1] as u16);
let f = (u as i16 as f64) / (i16::MAX as f64);
f * f
})
.sum();
let rms = (sum / ((data.len() / 2) as f64)).sqrt();
println!("rms: {}", rms);
FlowReturn::Ok
},
));
assert_ne!(
pipeline.set_state(gst::State::Playing),
gst::StateChangeReturn::Failure
);
let bus = pipeline.get_bus().unwrap();
loop {
let msg = match bus.timed_pop(u64::MAX) {
None => break,
Some(msg) => msg,
};
match msg.view() {
MessageView::Eos(..) => break,
MessageView::Error(err) => {
println!(
"Error from {}: {} ({:?})",
msg.get_src().get_path_string(),
err.get_error(),
err.get_debug()
);
break;
}
_ => (),
}
}
assert_ne!(
pipeline.set_state(gst::State::Null),
gst::StateChangeReturn::Failure
);
}
......@@ -36,3 +36,5 @@ pub use auto::traits::*;
mod app_src;
mod app_sink;
pub use app_src::AppSrcCallbacks;
pub use app_sink::AppSinkCallbacks;
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