gstreamer-rs/gstreamer-app/src/app_src.rs

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// Take a look at the license at the top of the repository in the LICENSE file.
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use futures_sink::Sink;
use glib::ffi::{gboolean, gpointer};
use glib::prelude::*;
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use glib::translate::*;
use crate::AppSrc;
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use std::cell::RefCell;
use std::mem;
use std::panic;
use std::pin::Pin;
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use std::ptr;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, Mutex};
use std::task::{Context, Poll, Waker};
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#[allow(clippy::type_complexity)]
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pub struct AppSrcCallbacks {
need_data: Option<RefCell<Box<dyn FnMut(&AppSrc, u32) + Send + 'static>>>,
enough_data: Option<Box<dyn Fn(&AppSrc) + Send + Sync + 'static>>,
seek_data: Option<Box<dyn Fn(&AppSrc, u64) -> bool + Send + Sync + 'static>>,
panicked: AtomicBool,
callbacks: ffi::GstAppSrcCallbacks,
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}
unsafe impl Send for AppSrcCallbacks {}
unsafe impl Sync for AppSrcCallbacks {}
impl AppSrcCallbacks {
pub fn builder() -> AppSrcCallbacksBuilder {
skip_assert_initialized!();
AppSrcCallbacksBuilder {
need_data: None,
enough_data: None,
seek_data: None,
}
}
}
#[allow(clippy::type_complexity)]
pub struct AppSrcCallbacksBuilder {
need_data: Option<RefCell<Box<dyn FnMut(&AppSrc, u32) + Send + 'static>>>,
enough_data: Option<Box<dyn Fn(&AppSrc) + Send + Sync + 'static>>,
seek_data: Option<Box<dyn Fn(&AppSrc, u64) -> bool + Send + Sync + 'static>>,
}
impl AppSrcCallbacksBuilder {
pub fn need_data<F: FnMut(&AppSrc, u32) + Send + 'static>(self, need_data: F) -> Self {
Self {
need_data: Some(RefCell::new(Box::new(need_data))),
..self
}
}
pub fn enough_data<F: Fn(&AppSrc) + Send + Sync + 'static>(self, enough_data: F) -> Self {
Self {
enough_data: Some(Box::new(enough_data)),
..self
}
}
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pub fn seek_data<F: Fn(&AppSrc, u64) -> bool + Send + Sync + 'static>(
self,
seek_data: F,
) -> Self {
Self {
seek_data: Some(Box::new(seek_data)),
..self
}
}
pub fn build(self) -> AppSrcCallbacks {
let have_need_data = self.need_data.is_some();
let have_enough_data = self.enough_data.is_some();
let have_seek_data = self.seek_data.is_some();
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AppSrcCallbacks {
need_data: self.need_data,
enough_data: self.enough_data,
seek_data: self.seek_data,
panicked: AtomicBool::new(false),
callbacks: ffi::GstAppSrcCallbacks {
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need_data: if have_need_data {
Some(trampoline_need_data)
} else {
None
},
enough_data: if have_enough_data {
Some(trampoline_enough_data)
} else {
None
},
seek_data: if have_seek_data {
Some(trampoline_seek_data)
} else {
None
},
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_gst_reserved: [
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut(),
],
},
}
}
}
fn post_panic_error_message(element: &AppSrc, err: &dyn std::any::Any) {
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skip_assert_initialized!();
if let Some(cause) = err.downcast_ref::<&str>() {
gst::gst_element_error!(&element, gst::LibraryError::Failed, ["Panicked: {}", cause]);
} else if let Some(cause) = err.downcast_ref::<String>() {
gst::gst_element_error!(&element, gst::LibraryError::Failed, ["Panicked: {}", cause]);
} else {
gst::gst_element_error!(&element, gst::LibraryError::Failed, ["Panicked"]);
}
}
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unsafe extern "C" fn trampoline_need_data(
appsrc: *mut ffi::GstAppSrc,
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length: u32,
callbacks: gpointer,
) {
let callbacks = &*(callbacks as *const AppSrcCallbacks);
let element: Borrowed<AppSrc> = from_glib_borrow(appsrc);
if callbacks.panicked.load(Ordering::Relaxed) {
let element: Borrowed<AppSrc> = from_glib_borrow(appsrc);
gst::gst_element_error!(&element, gst::LibraryError::Failed, ["Panicked"]);
return;
}
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if let Some(ref need_data) = callbacks.need_data {
let result = panic::catch_unwind(panic::AssertUnwindSafe(|| {
(&mut *need_data.borrow_mut())(&element, length)
}));
match result {
Ok(result) => result,
Err(err) => {
callbacks.panicked.store(true, Ordering::Relaxed);
post_panic_error_message(&element, &err);
}
}
}
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}
unsafe extern "C" fn trampoline_enough_data(appsrc: *mut ffi::GstAppSrc, callbacks: gpointer) {
let callbacks = &*(callbacks as *const AppSrcCallbacks);
let element: Borrowed<AppSrc> = from_glib_borrow(appsrc);
if callbacks.panicked.load(Ordering::Relaxed) {
let element: Borrowed<AppSrc> = from_glib_borrow(appsrc);
gst::gst_element_error!(&element, gst::LibraryError::Failed, ["Panicked"]);
return;
}
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if let Some(ref enough_data) = callbacks.enough_data {
let result = panic::catch_unwind(panic::AssertUnwindSafe(|| (*enough_data)(&element)));
match result {
Ok(result) => result,
Err(err) => {
callbacks.panicked.store(true, Ordering::Relaxed);
post_panic_error_message(&element, &err);
}
}
}
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}
unsafe extern "C" fn trampoline_seek_data(
appsrc: *mut ffi::GstAppSrc,
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offset: u64,
callbacks: gpointer,
) -> gboolean {
let callbacks = &*(callbacks as *const AppSrcCallbacks);
let element: Borrowed<AppSrc> = from_glib_borrow(appsrc);
if callbacks.panicked.load(Ordering::Relaxed) {
let element: Borrowed<AppSrc> = from_glib_borrow(appsrc);
gst::gst_element_error!(&element, gst::LibraryError::Failed, ["Panicked"]);
return false.to_glib();
}
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let ret = if let Some(ref seek_data) = callbacks.seek_data {
let result =
panic::catch_unwind(panic::AssertUnwindSafe(|| (*seek_data)(&element, offset)));
match result {
Ok(result) => result,
Err(err) => {
callbacks.panicked.store(true, Ordering::Relaxed);
post_panic_error_message(&element, &err);
false
}
}
} else {
false
};
ret.to_glib()
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}
unsafe extern "C" fn destroy_callbacks(ptr: gpointer) {
Box::<AppSrcCallbacks>::from_raw(ptr as *mut _);
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}
impl AppSrc {
pub fn end_of_stream(&self) -> Result<gst::FlowSuccess, gst::FlowError> {
let ret: gst::FlowReturn =
unsafe { from_glib(ffi::gst_app_src_end_of_stream(self.to_glib_none().0)) };
ret.into_result()
}
pub fn push_buffer(&self, buffer: gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError> {
let ret: gst::FlowReturn = unsafe {
from_glib(ffi::gst_app_src_push_buffer(
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self.to_glib_none().0,
buffer.into_ptr(),
))
};
ret.into_result()
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}
#[cfg(any(feature = "v1_14", feature = "dox"))]
#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14")))]
pub fn push_buffer_list(
&self,
list: gst::BufferList,
) -> Result<gst::FlowSuccess, gst::FlowError> {
let ret: gst::FlowReturn = unsafe {
from_glib(ffi::gst_app_src_push_buffer_list(
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self.to_glib_none().0,
list.into_ptr(),
))
};
ret.into_result()
}
pub fn push_sample(&self, sample: &gst::Sample) -> Result<gst::FlowSuccess, gst::FlowError> {
let ret: gst::FlowReturn = unsafe {
from_glib(ffi::gst_app_src_push_sample(
self.to_glib_none().0,
sample.to_glib_none().0,
))
};
ret.into_result()
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}
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pub fn set_callbacks(&self, callbacks: AppSrcCallbacks) {
use once_cell::sync::Lazy;
static SET_ONCE_QUARK: Lazy<glib::Quark> =
Lazy::new(|| glib::Quark::from_string("gstreamer-rs-app-src-callbacks"));
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unsafe {
let src = self.to_glib_none().0;
// This is not thread-safe before 1.16.3, see
// https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/merge_requests/570
if gst::version() < (1, 16, 3, 0) {
if !glib::gobject_ffi::g_object_get_qdata(src as *mut _, SET_ONCE_QUARK.to_glib())
.is_null()
{
panic!("AppSrc callbacks can only be set once");
}
glib::gobject_ffi::g_object_set_qdata(
src as *mut _,
SET_ONCE_QUARK.to_glib(),
1 as *mut _,
);
}
ffi::gst_app_src_set_callbacks(
src,
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mut_override(&callbacks.callbacks),
Box::into_raw(Box::new(callbacks)) as *mut _,
Some(destroy_callbacks),
);
}
}
pub fn set_latency(&self, min: gst::ClockTime, max: gst::ClockTime) {
unsafe {
ffi::gst_app_src_set_latency(self.to_glib_none().0, min.to_glib(), max.to_glib());
}
}
pub fn get_latency(&self) -> (gst::ClockTime, gst::ClockTime) {
unsafe {
let mut min = mem::MaybeUninit::uninit();
let mut max = mem::MaybeUninit::uninit();
ffi::gst_app_src_get_latency(self.to_glib_none().0, min.as_mut_ptr(), max.as_mut_ptr());
(from_glib(min.assume_init()), from_glib(max.assume_init()))
}
}
pub fn sink(&self) -> AppSrcSink {
AppSrcSink::new(self)
}
}
#[derive(Debug)]
pub struct AppSrcSink {
app_src: glib::WeakRef<AppSrc>,
waker_reference: Arc<Mutex<Option<Waker>>>,
}
impl AppSrcSink {
fn new(app_src: &AppSrc) -> Self {
skip_assert_initialized!();
let waker_reference = Arc::new(Mutex::new(None as Option<Waker>));
app_src.set_callbacks(
AppSrcCallbacks::builder()
.need_data({
let waker_reference = Arc::clone(&waker_reference);
move |_, _| {
if let Some(waker) = waker_reference.lock().unwrap().take() {
waker.wake();
}
}
})
.build(),
);
Self {
app_src: app_src.downgrade(),
waker_reference,
}
}
}
impl Drop for AppSrcSink {
fn drop(&mut self) {
// This is not thread-safe before 1.16.3, see
// https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/merge_requests/570
if gst::version() >= (1, 16, 3, 0) {
if let Some(app_src) = self.app_src.upgrade() {
app_src.set_callbacks(AppSrcCallbacks::builder().build());
}
}
}
}
impl Sink<gst::Sample> for AppSrcSink {
type Error = gst::FlowError;
fn poll_ready(self: Pin<&mut Self>, context: &mut Context) -> Poll<Result<(), Self::Error>> {
let mut waker = self.waker_reference.lock().unwrap();
let app_src = match self.app_src.upgrade() {
Some(app_src) => app_src,
None => return Poll::Ready(Err(gst::FlowError::Eos)),
};
let current_level_bytes = app_src.get_current_level_bytes();
let max_bytes = app_src.get_max_bytes();
if current_level_bytes >= max_bytes && max_bytes != 0 {
waker.replace(context.waker().to_owned());
Poll::Pending
} else {
Poll::Ready(Ok(()))
}
}
fn start_send(self: Pin<&mut Self>, sample: gst::Sample) -> Result<(), Self::Error> {
let app_src = match self.app_src.upgrade() {
Some(app_src) => app_src,
None => return Err(gst::FlowError::Eos),
};
app_src.push_sample(&sample)?;
Ok(())
}
fn poll_flush(self: Pin<&mut Self>, _: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn poll_close(self: Pin<&mut Self>, _: &mut Context) -> Poll<Result<(), Self::Error>> {
let app_src = match self.app_src.upgrade() {
Some(app_src) => app_src,
None => return Poll::Ready(Ok(())),
};
app_src.end_of_stream()?;
Poll::Ready(Ok(()))
}
}
#[cfg(test)]
mod tests {
use super::*;
use futures_util::{sink::SinkExt, stream::StreamExt};
use gst::prelude::*;
use std::sync::atomic::{AtomicUsize, Ordering};
#[test]
fn test_app_src_sink() {
gst::init().unwrap();
let appsrc = gst::ElementFactory::make("appsrc", None).unwrap();
let fakesink = gst::ElementFactory::make("fakesink", None).unwrap();
fakesink.set_property("signal-handoffs", &true).unwrap();
let pipeline = gst::Pipeline::new(None);
pipeline.add(&appsrc).unwrap();
pipeline.add(&fakesink).unwrap();
appsrc.link(&fakesink).unwrap();
let mut bus_stream = pipeline.get_bus().unwrap().stream();
let mut app_src_sink = appsrc.dynamic_cast::<AppSrc>().unwrap().sink();
let sample_quantity = 5;
let samples = (0..sample_quantity)
.map(|_| gst::Sample::builder().buffer(&gst::Buffer::new()).build())
.collect::<Vec<gst::Sample>>();
let mut sample_stream = futures_util::stream::iter(samples).map(Ok);
let handoff_count_reference = Arc::new(AtomicUsize::new(0));
fakesink
.connect("handoff", false, {
let handoff_count_reference = Arc::clone(&handoff_count_reference);
move |_| {
handoff_count_reference.fetch_add(1, Ordering::AcqRel);
None
}
})
.unwrap();
pipeline.set_state(gst::State::Playing).unwrap();
futures_executor::block_on(app_src_sink.send_all(&mut sample_stream)).unwrap();
futures_executor::block_on(app_src_sink.close()).unwrap();
while let Some(message) = futures_executor::block_on(bus_stream.next()) {
match message.view() {
gst::MessageView::Eos(_) => break,
gst::MessageView::Error(_) => unreachable!(),
_ => continue,
}
}
pipeline.set_state(gst::State::Null).unwrap();
assert_eq!(
handoff_count_reference.load(Ordering::Acquire),
sample_quantity
);
}
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}