Drop gst-plugin- prefix in plugin directory name

1 files changed, 282 insertions, 0 deletions

diff --git a/generic/threadshare/src/dataqueue.rs b/generic/threadshare/src/dataqueue.rs
new file mode 100644
index 000000000..9f77d9664
--- /dev/null
+++ b/generic/threadshare/src/dataqueue.rs
@@ -0,0 +1,282 @@
+// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the
+// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
+// Boston, MA 02110-1335, USA.
+
+use futures::future::{self, abortable, AbortHandle};
+
+use gst;
+use gst::gst_debug;
+use gst::prelude::*;
+
+use lazy_static::lazy_static;
+
+use std::collections::VecDeque;
+use std::sync::Arc;
+use std::sync::Mutex as StdMutex;
+use std::{u32, u64};
+
+lazy_static! {
+    static ref DATA_QUEUE_CAT: gst::DebugCategory = 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.get_size() as u32),
+            DataQueueItem::BufferList(ref list) => (
+                list.len() as u32,
+                list.iter().map(|b| b.get_size() as u32).sum::<u32>(),
+            ),
+            DataQueueItem::Event(_) => (0, 0),
+        }
+    }
+
+    fn timestamp(&self) -> Option<u64> {
+        match *self {
+            DataQueueItem::Buffer(ref buffer) => buffer.get_dts_or_pts().0,
+            DataQueueItem::BufferList(ref list) => {
+                list.iter().filter_map(|b| b.get_dts_or_pts().0).next()
+            }
+            DataQueueItem::Event(_) => None,
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum DataQueueState {
+    Paused,
+    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<u64>,
+
+    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: Option<u64>,
+    ) -> 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,
+            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 pause(&self) {
+        let mut inner = self.0.lock().unwrap();
+        if inner.state == DataQueueState::Paused {
+            gst_debug!(DATA_QUEUE_CAT, obj: &inner.element, "Data queue already Paused");
+            return;
+        }
+        gst_debug!(DATA_QUEUE_CAT, obj: &inner.element, "Pausing data queue");
+        assert_eq!(DataQueueState::Started, inner.state);
+        inner.state = DataQueueState::Paused;
+        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();
+
+        assert_eq!(inner.state, DataQueueState::Paused);
+        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.get_type() != gst::EventType::Segment
+                    && event.get_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);
+            }
+        }
+
+        // FIXME: Use running time
+        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(())
+    }
+
+    // TODO: implement as a Stream now that we use a StdMutex
+    #[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::Paused => {
+                        gst_debug!(DATA_QUEUE_CAT, obj: &inner.element, "Data queue Paused");
+                        return None;
+                    }
+                    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;
+        }
+    }
+}