Add gst::TagSetter example

This commit is contained in:
Sebastian Dröge 2017-12-24 14:49:27 +02:00
parent 25a8ce4f8d
commit f4da93aadb

View file

@ -0,0 +1,99 @@
extern crate gstreamer as gst;
use gst::prelude::*;
extern crate glib;
use std::error::Error as StdError;
extern crate failure;
use failure::Error;
#[macro_use]
extern crate failure_derive;
#[path = "../examples-common.rs"]
mod examples_common;
#[derive(Debug, Fail)]
#[fail(display = "Missing element {}", _0)]
struct MissingElement(String);
#[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 mut context = gst::ParseContext::new();
let pipeline = match gst::parse_launch_full(
"audiotestsrc wave=white-noise num-buffers=100 ! flacenc ! filesink location=test.flac",
Some(&mut context),
gst::ParseFlags::NONE,
) {
Ok(pipeline) => pipeline,
Err(err) => {
if let Some(gst::ParseError::NoSuchElement) = err.kind::<gst::ParseError>() {
return Err(MissingElement(context.get_missing_elements().join(",")).into());
} else {
return Err(err.into());
}
}
};
let pipeline = pipeline
.downcast::<gst::Pipeline>()
.map_err(|_| failure::err_msg("Generated pipeline is no pipeline"))?;
let tagsetter = pipeline
.get_by_interface(gst::TagSetter::static_type())
.ok_or(failure::err_msg("No TagSetter found"))?;
let tagsetter = tagsetter
.dynamic_cast::<gst::TagSetter>()
.map_err(|_| failure::err_msg("No TagSetter found"))?;
tagsetter.set_tag_merge_mode(gst::TagMergeMode::KeepAll);
tagsetter.add::<gst::tags::Title>(&"Special randomized white-noise", gst::TagMergeMode::Append);
let bus = pipeline.get_bus().unwrap();
pipeline.set_state(gst::State::Playing).into_result()?;
while let Some(msg) = bus.timed_pop(gst::CLOCK_TIME_NONE) {
use gst::MessageView;
match msg.view() {
MessageView::Eos(..) => break,
MessageView::Error(err) => {
Err(ErrorMessage {
src: msg.get_src()
.map(|s| s.get_path_string())
.unwrap_or_else(|| String::from("None")),
error: err.get_error().description().into(),
debug: err.get_debug(),
cause: err.get_error(),
})?;
break;
}
_ => (),
}
}
pipeline.set_state(gst::State::Null).into_result()?;
Ok(())
}
fn main() {
// 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)
match examples_common::run(example_main) {
Ok(r) => r,
Err(e) => eprintln!("Error! {}", e),
}
}