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Add failure-based error handling to the decodebin example

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This also makes use of directly reporting errors from a callback, by
transferring it via the error message to the main thread.
This commit is contained in:
Sebastian Dröge 2017-11-16 13:39:34 +02:00
parent d430467ed5
commit 86b787ac81
2 changed files with 148 additions and 55 deletions
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1
examples/Cargo.toml
View file

@ -28,6 +28,7 @@ gtkvideooverlay-x11 = ["gtkvideooverlay"]
gtkvideooverlay-quartz = ["gtkvideooverlay"] gtkvideooverlay-quartz = ["gtkvideooverlay"]
tokio = ["gstreamer/futures", "futures", "tokio-core"] tokio = ["gstreamer/futures", "futures", "tokio-core"]
default-features = [] default-features = []
v1_10 = ["gstreamer/v1_10"]
[badges] [badges]
travis-ci = { repository = "sdroege/gstreamer-rs", branch = "master" } travis-ci = { repository = "sdroege/gstreamer-rs", branch = "master" }

186
examples/src/bin/decodebin.rs
View file

@ -1,15 +1,37 @@
#[macro_use]
extern crate gstreamer as gst; extern crate gstreamer as gst;
use gst::prelude::*; use gst::prelude::*;
extern crate glib; extern crate glib;
use std::env; use std::env;
use std::error::Error as StdError;
use std::sync::{Arc, Mutex};
extern crate failure;
use failure::Error;
#[macro_use]
extern crate failure_derive;
#[path = "../examples-common.rs"] #[path = "../examples-common.rs"]
mod examples_common; mod examples_common;
fn example_main() { #[derive(Debug, Fail)]
gst::init().unwrap(); #[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,
}
fn example_main() -> Result<(), Error> {
gst::init()?;
let args: Vec<_> = env::args().collect(); let args: Vec<_> = env::args().collect();
let uri: &str = if args.len() == 2 { let uri: &str = if args.len() == 2 {
@ -20,69 +42,110 @@ fn example_main() {
}; };
let pipeline = gst::Pipeline::new(None); let pipeline = gst::Pipeline::new(None);
let src = gst::ElementFactory::make("filesrc", None).unwrap(); let src = gst::ElementFactory::make("filesrc", None).ok_or(MissingElement("filesrc"))?;
let decodebin = gst::ElementFactory::make("decodebin", None).unwrap(); let decodebin =
gst::ElementFactory::make("decodebin", None).ok_or(MissingElement("decodebin"))?;
src.set_property("location", &glib::Value::from(uri)) src.set_property("location", &uri)?;
.unwrap();
pipeline.add_many(&[&src, &decodebin]).unwrap(); pipeline.add_many(&[&src, &decodebin])?;
gst::Element::link_many(&[&src, &decodebin]).unwrap(); gst::Element::link_many(&[&src, &decodebin])?;
// Need to move a new reference into the closure // Need to move a new reference into the closure
let pipeline_clone = pipeline.clone(); let pipeline_clone = pipeline.clone();
decodebin.connect_pad_added(move |_, src_pad| { decodebin.connect_pad_added(move |dbin, src_pad| {
let pipeline = &pipeline_clone; let pipeline = &pipeline_clone;
let (is_audio, is_video) = { let (is_audio, is_video) = {
let caps = src_pad.get_current_caps().unwrap(); let media_type = src_pad.get_current_caps().and_then(|caps| {
let structure = caps.get_structure(0).unwrap(); caps.get_structure(0).map(|s| {
let name = structure.get_name(); let name = s.get_name();
(name.starts_with("audio/"), name.starts_with("video/")) (name.starts_with("audio/"), name.starts_with("video/"))
})
});
match media_type {
None => {
gst_element_warning!(
dbin,
gst::CoreError::Negotiation,
("Failed to get media type from pad {}", src_pad.get_name())
);
return;
}
Some(media_type) => media_type,
}
}; };
let insert_sink = |is_audio, is_video| -> Result<(), Error> {
if is_audio { if is_audio {
let queue = gst::ElementFactory::make("queue", None).unwrap(); let queue =
let convert = gst::ElementFactory::make("audioconvert", None).unwrap(); gst::ElementFactory::make("queue", None).ok_or(MissingElement("queue"))?;
let resample = gst::ElementFactory::make("audioresample", None).unwrap(); let convert = gst::ElementFactory::make("audioconvert", None)
let sink = gst::ElementFactory::make("autoaudiosink", None).unwrap(); .ok_or(MissingElement("audioconvert"))?;
let resample = gst::ElementFactory::make("audioresample", None)
.ok_or(MissingElement("audioresample"))?;
let sink = gst::ElementFactory::make("autoaudiosink", None)
.ok_or(MissingElement("autoaudiosink"))?;
let elements = &[&queue, &convert, &resample, &sink]; let elements = &[&queue, &convert, &resample, &sink];
pipeline.add_many(elements).unwrap(); pipeline.add_many(elements)?;
gst::Element::link_many(elements).unwrap(); gst::Element::link_many(elements)?;
for e in elements { for e in elements {
e.sync_state_with_parent().unwrap(); e.sync_state_with_parent()?;
} }
let sink_pad = queue.get_static_pad("sink").unwrap(); let sink_pad = queue.get_static_pad("sink").expect("queue has no sinkpad");
assert_eq!(src_pad.link(&sink_pad), gst::PadLinkReturn::Ok); src_pad.link(&sink_pad).into_result()?;
} else if is_video { } else if is_video {
let queue = gst::ElementFactory::make("queue", None).unwrap(); let queue =
let convert = gst::ElementFactory::make("videoconvert", None).unwrap(); gst::ElementFactory::make("queue", None).ok_or(MissingElement("queue"))?;
let scale = gst::ElementFactory::make("videoscale", None).unwrap(); let convert = gst::ElementFactory::make("videoconvert", None)
let sink = gst::ElementFactory::make("autovideosink", None).unwrap(); .ok_or(MissingElement("videoconvert"))?;
let scale = gst::ElementFactory::make("videoscale", None)
.ok_or(MissingElement("videoscale"))?;
let sink = gst::ElementFactory::make("autovideosink", None)
.ok_or(MissingElement("autovideosink"))?;
let elements = &[&queue, &convert, &scale, &sink]; let elements = &[&queue, &convert, &scale, &sink];
pipeline.add_many(elements).unwrap(); pipeline.add_many(elements)?;
gst::Element::link_many(elements).unwrap(); gst::Element::link_many(elements)?;
for e in elements { for e in elements {
e.sync_state_with_parent().unwrap(); e.sync_state_with_parent()?
} }
let sink_pad = queue.get_static_pad("sink").unwrap(); let sink_pad = queue.get_static_pad("sink").expect("queue has no sinkpad");
assert_eq!(src_pad.link(&sink_pad), gst::PadLinkReturn::Ok); src_pad.link(&sink_pad).into_result()?;
}
Ok(())
};
if let Err(err) = insert_sink(is_audio, is_video) {
#[cfg(feature = "v1_10")]
gst_element_error!(
dbin,
gst::LibraryError::Failed,
("Failed to insert sink"),
details: gst::Structure::builder("error-details")
.field("error",
glib::AnySendValue::new(Arc::new(Mutex::new(Some(err)))))
.build()
);
#[cfg(not(feature = "v1_10"))]
gst_element_error!(dbin, gst::LibraryError::Failed, ("Failed to insert sink"));
} }
}); });
assert_ne!( pipeline.set_state(gst::State::Playing).into_result()?;
pipeline.set_state(gst::State::Playing),
gst::StateChangeReturn::Failure
);
let bus = pipeline.get_bus().unwrap(); let bus = pipeline
.get_bus()
.expect("Pipeline without bus. Shouldn't happen!");
while let Some(msg) = bus.timed_pop(gst::CLOCK_TIME_NONE) { while let Some(msg) = bus.timed_pop(gst::CLOCK_TIME_NONE) {
use gst::MessageView; use gst::MessageView;
@ -90,12 +153,39 @@ fn example_main() {
match msg.view() { match msg.view() {
MessageView::Eos(..) => break, MessageView::Eos(..) => break,
MessageView::Error(err) => { MessageView::Error(err) => {
println!( pipeline.set_state(gst::State::Null).into_result()?;
"Error from {}: {} ({:?})",
msg.get_src().get_path_string(), #[cfg(feature = "v1_10")]
err.get_error(), {
err.get_debug() match err.get_details() {
); Some(details) if details.get_name() == "error-details" => details
.get::<&glib::AnySendValue>("error")
.cloned()
.and_then(|v| {
v.downcast_ref::<Arc<Mutex<Option<Error>>>>()
.and_then(|v| v.lock().unwrap().take())
})
.map(Result::Err)
.expect("error-details message without actual error"),
_ => Err(
ErrorMessage {
src: msg.get_src().get_path_string(),
error: err.get_error().description().into(),
debug: err.get_debug(),
cause: err.get_error(),
}.into(),
),
}?;
}
#[cfg(not(feature = "v1_10"))]
{
Err(ErrorMessage {
src: msg.get_src().get_path_string(),
error: err.get_error().description().into(),
debug: err.get_debug(),
cause: err.get_error(),
})?;
}
break; break;
} }
MessageView::StateChanged(s) => { MessageView::StateChanged(s) => {
@ -111,14 +201,16 @@ fn example_main() {
} }
} }
assert_ne!( pipeline.set_state(gst::State::Null).into_result()?;
pipeline.set_state(gst::State::Null),
gst::StateChangeReturn::Failure Ok(())
);
} }
fn main() { fn main() {
// tutorials_common::run is only required to set up the application environent on macOS // tutorials_common::run is only required to set up the application environent on macOS
// (but not necessary in normal Cocoa applications where this is set up autmatically) // (but not necessary in normal Cocoa applications where this is set up autmatically)
examples_common::run(example_main); match examples_common::run(example_main) {
Ok(r) => r,
Err(e) => eprintln!("Error! {}", e),
}
} }