Commit c9027fb2 authored by Sebastian Dröge's avatar Sebastian Dröge 🍵
Browse files

Switch appsrc example to failure based error handling

parent 1481cba5
......@@ -14,13 +14,11 @@ use std::i32;
use std::error::Error as StdError;
extern crate failure;
use failure::Error;
#[macro_use]
extern crate failure_derive;
#[allow(unused_imports)]
use failure::{Error, Fail};
#[derive(Debug, Fail)]
#[fail(display = "Missing element {}", _0)]
struct MissingElement(&'static str);
......
......@@ -3,26 +3,46 @@ use gst::prelude::*;
extern crate gstreamer_app as gst_app;
extern crate gstreamer_video as gst_video;
extern crate glib;
use std::thread;
pub mod utils;
use std::error::Error as StdError;
extern crate failure;
use failure::Error;
#[macro_use]
extern crate failure_derive;
#[derive(Debug, Fail)]
#[fail(display = "Missing element {}", _0)]
struct MissingElement(&'static str);
#[derive(Debug, Fail)]
#[fail(display = "Received error from {}: {} (debug: {:?})", src, error, debug)]
struct ErrorMessage {
src: String,
error: String,
debug: Option<String>,
#[cause] cause: glib::Error,
}
const WIDTH: usize = 320;
const HEIGHT: usize = 240;
fn create_pipeline() -> Result<(gst::Pipeline, gst_app::AppSrc), utils::ExampleError> {
gst::init().map_err(utils::ExampleError::InitFailed)?;
fn create_pipeline() -> Result<(gst::Pipeline, gst_app::AppSrc), Error> {
gst::init()?;
let pipeline = gst::Pipeline::new(None);
let src = utils::create_element("appsrc")?;
let videoconvert = utils::create_element("videoconvert")?;
let sink = utils::create_element("autovideosink")?;
let src = gst::ElementFactory::make("appsrc", None).ok_or(MissingElement("appsrc"))?;
let videoconvert =
gst::ElementFactory::make("videoconvert", None).ok_or(MissingElement("videoconvert"))?;
let sink =
gst::ElementFactory::make("autovideosink", None).ok_or(MissingElement("autovideosink"))?;
pipeline
.add_many(&[&src, &videoconvert, &sink])
.expect("Unable to add elements in the pipeline");
utils::link_elements(&src, &videoconvert)?;
utils::link_elements(&videoconvert, &sink)?;
pipeline.add_many(&[&src, &videoconvert, &sink])?;
gst::Element::link_many(&[&src, &videoconvert, &sink])?;
let appsrc = src.clone()
.dynamic_cast::<gst_app::AppSrc>()
......@@ -31,7 +51,7 @@ fn create_pipeline() -> Result<(gst::Pipeline, gst_app::AppSrc), utils::ExampleE
let info = gst_video::VideoInfo::new(gst_video::VideoFormat::Bgrx, WIDTH as u32, HEIGHT as u32)
.fps(gst::Fraction::new(2, 1))
.build()
.unwrap();
.expect("Failed to create video info");
appsrc.set_caps(&info.to_caps().unwrap());
appsrc.set_property_format(gst::Format::Time);
......@@ -41,9 +61,7 @@ fn create_pipeline() -> Result<(gst::Pipeline, gst_app::AppSrc), utils::ExampleE
Ok((pipeline, appsrc))
}
fn main_loop() -> Result<(), utils::ExampleError> {
let (pipeline, appsrc) = create_pipeline()?;
fn main_loop(pipeline: gst::Pipeline, appsrc: gst_app::AppSrc) -> Result<(), Error> {
thread::spawn(move || {
for i in 0..100 {
println!("Producing frame {}", i);
......@@ -76,7 +94,7 @@ fn main_loop() -> Result<(), utils::ExampleError> {
let _ = appsrc.end_of_stream();
});
utils::set_state(&pipeline, gst::State::Playing)?;
pipeline.set_state(gst::State::Playing).into_result()?;
let bus = pipeline
.get_bus()
......@@ -88,24 +106,25 @@ fn main_loop() -> Result<(), utils::ExampleError> {
match msg.view() {
MessageView::Eos(..) => break,
MessageView::Error(err) => {
utils::set_state(&pipeline, gst::State::Null)?;
return Err(utils::ExampleError::ElementError(
msg.get_src().get_path_string(),
err.get_error(),
err.get_debug().unwrap(),
));
pipeline.set_state(gst::State::Null).into_result()?;
Err(ErrorMessage {
src: msg.get_src().get_path_string(),
error: err.get_error().description().into(),
debug: err.get_debug(),
cause: err.get_error(),
})?;
}
_ => (),
}
}
utils::set_state(&pipeline, gst::State::Null)?;
pipeline.set_state(gst::State::Null).into_result()?;
Ok(())
}
fn main() {
match main_loop() {
match create_pipeline().and_then(|(pipeline, appsrc)| main_loop(pipeline, appsrc)) {
Ok(r) => r,
Err(e) => eprintln!("Error! {}", e),
}
......
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