mirrors/gstreamer-rs
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Change appsrc example to directly push data from the need-data callback

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There's no need to start yet another thread just to push data in this
case, we can simply use the callback and store the frame counter in the
mutable environment of the closure.
This commit is contained in:
Sebastian Dröge 2018-05-18 11:37:57 +03:00
parent a10532c379
commit 7734725da1
1 changed files with 45 additions and 40 deletions
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85
examples/src/bin/appsrc.rs
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@ -5,8 +5,6 @@ extern crate gstreamer_video as gst_video;
extern crate glib;
use std::thread;
use std::error::Error as StdError;
extern crate failure;
@ -35,7 +33,7 @@ struct ErrorMessage {
const WIDTH: usize = 320;
const HEIGHT: usize = 240;
fn create_pipeline() -> Result<(gst::Pipeline, gst_app::AppSrc), Error> {
fn create_pipeline() -> Result<gst::Pipeline, Error> {
gst::init()?;
let pipeline = gst::Pipeline::new(None);
@ -59,45 +57,52 @@ fn create_pipeline() -> Result<(gst::Pipeline, gst_app::AppSrc), Error> {
appsrc.set_caps(&info.to_caps().unwrap());
appsrc.set_property_format(gst::Format::Time);
appsrc.set_max_bytes(1);
appsrc.set_property_block(true);
Ok((pipeline, appsrc))
// Our frame counter, that is stored in the mutable environment
// of the closure of the need-data callback
let mut i = 0;
appsrc.set_callbacks(
gst_app::AppSrcCallbacks::new()
.need_data(move |appsrc, _| {
if i == 100 {
let _ = appsrc.end_of_stream();
return;
}
println!("Producing frame {}", i);
let r = if i % 2 == 0 { 0 } else { 255 };
let g = if i % 3 == 0 { 0 } else { 255 };
let b = if i % 5 == 0 { 0 } else { 255 };
let mut buffer = gst::Buffer::with_size(WIDTH * HEIGHT * 4).unwrap();
{
let buffer = buffer.get_mut().unwrap();
buffer.set_pts(i * 500 * gst::MSECOND);
let mut data = buffer.map_writable().unwrap();
for p in data.as_mut_slice().chunks_mut(4) {
assert_eq!(p.len(), 4);
p[0] = b;
p[1] = g;
p[2] = r;
p[3] = 0;
}
}
i += 1;
// appsrc already handles the error here
let _ = appsrc.push_buffer(buffer);
})
.build(),
);
Ok(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);
let r = if i % 2 == 0 { 0 } else { 255 };
let g = if i % 3 == 0 { 0 } else { 255 };
let b = if i % 5 == 0 { 0 } else { 255 };
let mut buffer = gst::Buffer::with_size(WIDTH * HEIGHT * 4).unwrap();
{
let buffer = buffer.get_mut().unwrap();
buffer.set_pts(i * 500 * gst::MSECOND);
let mut data = buffer.map_writable().unwrap();
for p in data.as_mut_slice().chunks_mut(4) {
assert_eq!(p.len(), 4);
p[0] = b;
p[1] = g;
p[2] = r;
p[3] = 0;
}
}
if appsrc.push_buffer(buffer) != gst::FlowReturn::Ok {
break;
}
}
let _ = appsrc.end_of_stream();
});
fn main_loop(pipeline: gst::Pipeline) -> Result<(), Error> {
pipeline.set_state(gst::State::Playing).into_result()?;
let bus = pipeline
@ -130,7 +135,7 @@ fn main_loop(pipeline: gst::Pipeline, appsrc: gst_app::AppSrc) -> Result<(), Err
}
fn example_main() {
match create_pipeline().and_then(|(pipeline, appsrc)| main_loop(pipeline, appsrc)) {
match create_pipeline().and_then(main_loop) {
Ok(r) => r,
Err(e) => eprintln!("Error! {}", e),
}