Commit 0c3c4166 authored by Sebastian Dröge's avatar Sebastian Dröge 🍵

Add example for pad probes

parent 77912e71
extern crate gstreamer as gst;
use gst::*;
use std::u64;
use std::i16;
use std::env;
use std::mem;
fn main() {
gst::init().unwrap();
let pipeline = gst::parse_launch("audiotestsrc name=src ! audio/x-raw,format=S16BE,channels=1 ! fakesink").unwrap();
let bus = pipeline.get_bus().unwrap();
let src = pipeline.clone().dynamic_cast::<Bin>().unwrap().get_by_name("src").unwrap();
let src_pad = src.get_static_pad("src").unwrap();
src_pad.add_probe(PAD_PROBE_TYPE_BUFFER, |_, probe_info| {
if let Some(ref probe_data) = probe_info.data {
match *probe_data {
PadProbeData::Buffer(ref buffer) => {
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);
},
_ => (),
}
}
PadProbeReturn::Ok
});
let ret = pipeline.set_state(gst::State::Playing);
assert_ne!(ret, gst::StateChangeReturn::Failure);
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;
}
_ => (),
}
}
let ret = pipeline.set_state(gst::State::Null);
assert_ne!(ret, gst::StateChangeReturn::Failure);
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment