use futures::future::{self, abortable, AbortHandle};
use gst::prelude::*;
use once_cell::sync::Lazy;
use std::collections::VecDeque;
use std::sync::Arc;
use std::sync::Mutex as StdMutex;
use std::u32;
static DATA_QUEUE_CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"ts-dataqueue",
gst::DebugColorFlags::empty(),
Some("Thread-sharing queue"),
)
});
#[derive(Debug)]
pub enum DataQueueItem {
Buffer(gst::Buffer),
BufferList(gst::BufferList),
Event(gst::Event),
}
impl DataQueueItem {
fn size(&self) -> (u32, u32) {
match *self {
DataQueueItem::Buffer(ref buffer) => (1, buffer.size() as u32),
DataQueueItem::BufferList(ref list) => (
list.len() as u32,
list.iter().map(|b| b.size() as u32).sum::<u32>(),
),
DataQueueItem::Event(_) => (0, 0),
}
}
fn timestamp(&self) -> Option<gst::ClockTime> {
match *self {
DataQueueItem::Buffer(ref buffer) => buffer.dts_or_pts(),
DataQueueItem::BufferList(ref list) => list.iter().find_map(|b| b.dts_or_pts()),
DataQueueItem::Event(_) => None,
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum DataQueueState {
Started,
Stopped,
}
#[derive(Clone, Debug)]
pub struct DataQueue(Arc<StdMutex<DataQueueInner>>);
#[derive(Debug)]
struct DataQueueInner {
element: gst::Element,
src_pad: gst::Pad,
state: DataQueueState,
queue: VecDeque<DataQueueItem>,
cur_size_buffers: u32,
cur_size_bytes: u32,
max_size_buffers: Option<u32>,
max_size_bytes: Option<u32>,
max_size_time: Option<gst::ClockTime>,
pending_handle: Option<AbortHandle>,
}
impl DataQueueInner {
fn wake(&mut self) {
if let Some(pending_handle) = self.pending_handle.take() {
pending_handle.abort();
}
}
}
impl DataQueue {
pub fn new(
element: &gst::Element,
src_pad: &gst::Pad,
max_size_buffers: Option<u32>,
max_size_bytes: Option<u32>,
max_size_time: impl Into<Option<gst::ClockTime>>,
) -> DataQueue {
DataQueue(Arc::new(StdMutex::new(DataQueueInner {
element: element.clone(),
src_pad: src_pad.clone(),
state: DataQueueState::Stopped,
queue: VecDeque::new(),
cur_size_buffers: 0,
cur_size_bytes: 0,
max_size_buffers,
max_size_bytes,
max_size_time: max_size_time.into(),
pending_handle: None,
})))
}
pub fn state(&self) -> DataQueueState {
self.0.lock().unwrap().state
}
pub fn start(&self) {
let mut inner = self.0.lock().unwrap();
if inner.state == DataQueueState::Started {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Data queue already Started");
return;
}
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Starting data queue");
inner.state = DataQueueState::Started;
inner.wake();
}
pub fn stop(&self) {
let mut inner = self.0.lock().unwrap();
if inner.state == DataQueueState::Stopped {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Data queue already Stopped");
return;
}
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Stopping data queue");
inner.state = DataQueueState::Stopped;
inner.wake();
}
pub fn clear(&self) {
let mut inner = self.0.lock().unwrap();
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Clearing data queue");
let src_pad = inner.src_pad.clone();
for item in inner.queue.drain(..) {
if let DataQueueItem::Event(event) = item {
if event.is_sticky()
&& event.type_() != gst::EventType::Segment
&& event.type_() != gst::EventType::Eos
{
let _ = src_pad.store_sticky_event(&event);
}
}
}
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Data queue cleared");
}
pub fn push(&self, item: DataQueueItem) -> Result<(), DataQueueItem> {
let mut inner = self.0.lock().unwrap();
if inner.state == DataQueueState::Stopped {
gst::debug!(
DATA_QUEUE_CAT,
obj: inner.element,
"Rejecting item {:?} in state {:?}",
item,
inner.state
);
return Err(item);
}
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Pushing item {:?}", item);
let (count, bytes) = item.size();
let queue_ts = inner.queue.iter().filter_map(|i| i.timestamp()).next();
let ts = item.timestamp();
if let Some(max) = inner.max_size_buffers {
if max <= inner.cur_size_buffers {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Queue is full (buffers): {} <= {}", max, inner.cur_size_buffers);
return Err(item);
}
}
if let Some(max) = inner.max_size_bytes {
if max <= inner.cur_size_bytes {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Queue is full (bytes): {} <= {}", max, inner.cur_size_bytes);
return Err(item);
}
}
if let (Some(max), Some(queue_ts), Some(ts)) = (inner.max_size_time, queue_ts, ts) {
let level = if queue_ts > ts {
queue_ts - ts
} else {
ts - queue_ts
};
if max <= level {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Queue is full (time): {} <= {}", max, level);
return Err(item);
}
}
inner.queue.push_back(item);
inner.cur_size_buffers += count;
inner.cur_size_bytes += bytes;
inner.wake();
Ok(())
}
#[allow(clippy::should_implement_trait)]
pub async fn next(&mut self) -> Option<DataQueueItem> {
loop {
let pending_fut = {
let mut inner = self.0.lock().unwrap();
match inner.state {
DataQueueState::Started => match inner.queue.pop_front() {
None => {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Data queue is empty");
}
Some(item) => {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Popped item {:?}", item);
let (count, bytes) = item.size();
inner.cur_size_buffers -= count;
inner.cur_size_bytes -= bytes;
return Some(item);
}
},
DataQueueState::Stopped => {
gst::debug!(DATA_QUEUE_CAT, obj: inner.element, "Data queue Stopped");
return None;
}
}
let (pending_fut, abort_handle) = abortable(future::pending::<()>());
inner.pending_handle = Some(abort_handle);
pending_fut
};
let _ = pending_fut.await;
}
}
}