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/*
* Copyright (C) 2011 Nokia Corporation.
* Copyright (C) 2012 Intel Corporation.
*
* Author: Zeeshan Ali (Khattak) <zeeshanak@gnome.org>
* <zeeshan.ali@nokia.com>
* Jens Georg <jensg@openismus.com>
*
* This file is part of Rygel.
*
* Rygel is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Rygel 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
using Gst;
internal class Rygel.GstSink : BaseSink {
public const string NAME = "http-gst-sink";
public const string PAD_NAME = "sink";
// High and low threshold for number of buffered chunks
private const uint MAX_BUFFERED_CHUNKS = 32;
private const uint MIN_BUFFERED_CHUNKS = 4;
public Cancellable cancellable;
private int priority;
private int64 chunks_buffered;
private int64 bytes_sent;
private int64 max_bytes;
private Mutex buffer_mutex = Mutex ();
private Cond buffer_condition = Cond ();
private unowned DataSource source;
private HTTPSeek offsets;
private bool frozen;
static construct {
var caps = new Caps.any ();
var template = new PadTemplate (PAD_NAME,
PadDirection.SINK,
PadPresence.ALWAYS,
caps);
add_pad_template (template);
}
public GstSink (DataSource source, HTTPSeek? offsets) {
this.chunks_buffered = 0;
this.bytes_sent = 0;
this.max_bytes = int64.MAX;
this.source = source;
this.offsets = offsets;
this.cancellable = new Cancellable ();
this.sync = false;
this.name = NAME;
this.frozen = false;
if (this.offsets != null) {
if (this.offsets is HTTPByteSeek) {
this.max_bytes = this.offsets.length;
}
}
this.cancellable.cancelled.connect (this.on_cancelled);
}
public void freeze () {
if (this.frozen) {
return;
}
this.buffer_mutex.lock ();
this.frozen = true;
this.buffer_mutex.unlock ();
}
public void thaw () {
if (!this.frozen) {
return;
}
this.buffer_mutex.lock ();
this.frozen = false;
this.buffer_condition.broadcast ();
this.buffer_mutex.unlock ();
}
public override FlowReturn render (Buffer buffer) {
this.buffer_mutex.lock ();
while (!this.cancellable.is_cancelled () &&
this.frozen) {
// Client is either not reading (Paused) or not fast enough
this.buffer_condition.wait (this.buffer_mutex);
}
this.buffer_mutex.unlock ();
if (this.cancellable.is_cancelled ()) {
return FlowReturn.OK;
}
Idle.add_full (this.priority, () => {
return this.push_data (buffer);
});
return FlowReturn.OK;
}
// Runs in application thread
public bool push_data (Buffer buffer) {
var left = this.max_bytes - this.bytes_sent;
if (this.cancellable.is_cancelled () || left <= 0) {
return false;
}
var to_send = int64.min (buffer.size, left);
this.source.data_available (buffer.data[0:to_send]);
this.chunks_buffered++;
this.bytes_sent += to_send;
return false;
}
private void on_cancelled () {
this.buffer_mutex.lock ();
this.buffer_condition.broadcast ();
this.buffer_mutex.unlock ();
}
}
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