2017-08-01 18:44:01 +00:00
|
|
|
extern crate gstreamer as gst;
|
|
|
|
use gst::*;
|
|
|
|
extern crate gstreamer_app as gst_app;
|
|
|
|
use gst_app::*;
|
|
|
|
|
|
|
|
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",
|
|
|
|
&[
|
2017-08-02 17:15:16 +00:00
|
|
|
("format", &"S16BE"),
|
|
|
|
("layout", &"interleaved"),
|
|
|
|
("channels", &(1i32)),
|
|
|
|
("rate", &IntRange::<i32>::new(1, i32::MAX)),
|
2017-08-01 18:44:01 +00:00
|
|
|
],
|
|
|
|
));
|
|
|
|
|
|
|
|
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
|
|
|
|
);
|
|
|
|
}
|