forked from mirrors/gstreamer-rs
Switch appsink example to failure based error handling
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parent
d857fbd349
commit
90700aa9b2
2 changed files with 72 additions and 26 deletions
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@ -17,7 +17,8 @@ futures = { version = "0.1", optional = true }
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tokio-core = { version = "0.1", optional = true }
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send-cell = "0.1"
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byte-slice-cast = "0.1"
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failure = "0.0.1"
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failure = { git = "https://github.com/withoutboats/failure.git" }
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failure_derive = { git = "https://github.com/withoutboats/failure_derive.git" }
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[features]
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gst-player = ["gstreamer-player"]
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@ -1,27 +1,49 @@
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#[macro_use]
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extern crate gstreamer as gst;
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use gst::prelude::*;
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extern crate gstreamer_app as gst_app;
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extern crate gstreamer_audio as gst_audio;
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extern crate glib;
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extern crate byte_slice_cast;
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use byte_slice_cast::*;
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use std::i16;
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use std::i32;
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use std::error::Error as StdError;
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pub mod utils;
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extern crate failure;
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#[macro_use]
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extern crate failure_derive;
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#[allow(unused_imports)]
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use failure::{Error, Fail};
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#[derive(Debug, Fail)]
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#[fail(display = "Missing element {}", _0)]
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struct MissingElement(&'static str);
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#[derive(Debug, Fail)]
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#[fail(display = "Received error from {}: {} (debug: {:?})", src, error, debug)]
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struct ErrorMessage {
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src: String,
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error: String,
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debug: Option<String>,
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#[cause] cause: glib::Error,
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}
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fn create_pipeline() -> Result<gst::Pipeline, Error> {
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gst::init()?;
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fn create_pipeline() -> Result<gst::Pipeline, utils::ExampleError> {
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gst::init().map_err(utils::ExampleError::InitFailed)?;
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let pipeline = gst::Pipeline::new(None);
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let src = utils::create_element("audiotestsrc")?;
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let sink = utils::create_element("appsink")?;
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let src =
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gst::ElementFactory::make("audiotestsrc", None).ok_or(MissingElement("audiotestsrc"))?;
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let sink = gst::ElementFactory::make("appsink", None).ok_or(MissingElement("appsink"))?;
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pipeline
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.add_many(&[&src, &sink])
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.expect("Unable to add elements in the pipeline");
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utils::link_elements(&src, &sink)?;
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pipeline.add_many(&[&src, &sink])?;
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src.link(&sink)?;
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let appsink = sink.clone()
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.dynamic_cast::<gst_app::AppSink>()
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@ -49,17 +71,39 @@ fn create_pipeline() -> Result<gst::Pipeline, utils::ExampleError> {
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Some(sample) => sample,
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};
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let buffer = sample
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.get_buffer()
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.expect("Unable to extract buffer from the sample");
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let buffer = if let Some(buffer) = sample.get_buffer() {
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buffer
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} else {
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gst_element_error!(
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appsink,
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gst::ResourceError::Failed,
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("Failed to get buffer from appsink")
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);
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let map = buffer
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.map_readable()
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.expect("Unable to map buffer for reading");
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return gst::FlowReturn::Error;
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};
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let map = if let Some(map) = buffer.map_readable() {
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map
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} else {
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gst_element_error!(
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appsink,
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gst::ResourceError::Failed,
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("Failed to map buffer readable")
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);
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return gst::FlowReturn::Error;
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};
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let samples = if let Ok(samples) = map.as_slice().as_slice_of::<i16>() {
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samples
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} else {
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gst_element_error!(
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appsink,
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gst::ResourceError::Failed,
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("Failed to interprete buffer as S16 PCM")
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);
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return gst::FlowReturn::Error;
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};
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@ -80,10 +124,10 @@ fn create_pipeline() -> Result<gst::Pipeline, utils::ExampleError> {
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Ok(pipeline)
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}
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fn main_loop() -> Result<(), utils::ExampleError> {
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fn main_loop() -> Result<(), Error> {
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let pipeline = create_pipeline()?;
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utils::set_state(&pipeline, gst::State::Playing)?;
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pipeline.set_state(gst::State::Playing).into_result()?;
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let bus = pipeline
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.get_bus()
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@ -95,18 +139,19 @@ fn main_loop() -> Result<(), utils::ExampleError> {
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match msg.view() {
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MessageView::Eos(..) => break,
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MessageView::Error(err) => {
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utils::set_state(&pipeline, gst::State::Null)?;
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return Err(utils::ExampleError::ElementError(
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msg.get_src().get_path_string(),
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err.get_error(),
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err.get_debug().unwrap(),
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));
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pipeline.set_state(gst::State::Null).into_result()?;
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Err(ErrorMessage {
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src: msg.get_src().get_path_string(),
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error: err.get_error().description().into(),
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debug: err.get_debug(),
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cause: err.get_error(),
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})?;
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}
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_ => (),
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}
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}
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utils::set_state(&pipeline, gst::State::Null)?;
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pipeline.set_state(gst::State::Null).into_result()?;
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Ok(())
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}
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