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/*
* Copyright (C) 2009-2012 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;
using GUPnP;
/**
* The base Transcoder class. Each implementation derives from it and must
* implement get_distance and get_encoding_profile methods.
*/
internal abstract class Rygel.GstTranscoder : Rygel.Transcoder {
public string preset { get;
protected set;
default = DEFAULT_ENCODING_PRESET; }
private const string DECODE_BIN = "decodebin2";
private const string ENCODE_BIN = "encodebin";
private const string DEFAULT_ENCODING_PRESET = "Rygel DLNA preset";
dynamic Element decoder;
dynamic Element encoder;
private bool link_failed;
public GstTranscoder (string mime_type,
string dlna_profile,
string upnp_class,
string extension) {
this.mime_type = mime_type;
this.dlna_profile = dlna_profile;
this.link_failed = true;
this.extension = extension;
}
/**
* Creates a transcoding source.
*
* @param src the media item to create the transcoding source for
* @param src the original (non-transcoding) source
*
* @return the new transcoding source
*/
public override DataSource create_source (MediaItem item,
DataSource src) throws Error {
// We can only link GStreamer data sources together
assert (src is GstDataSource);
var orig_source = src as GstDataSource;
this.decoder = GstUtils.create_element (DECODE_BIN,
DECODE_BIN);
this.encoder = GstUtils.create_element (ENCODE_BIN,
ENCODE_BIN);
encoder.profile = this.get_encoding_profile ();
debug ("%s using the following encoding profile:",
this.get_class ().get_type ().name ());
GstUtils.dump_encoding_profile (encoder.profile);
var bin = new Bin ("transcoder-source");
bin.add_many (orig_source.src, decoder, encoder);
orig_source.src.link (decoder);
decoder.pad_added.connect (this.on_decoder_pad_added);
decoder.autoplug_continue.connect (this.on_autoplug_continue);
decoder.no_more_pads.connect (this.on_no_more_pads);
var pad = encoder.get_static_pad ("src");
var ghost = new GhostPad (null, pad);
bin.add_pad (ghost);
return new GstDataSource.from_element (bin);
}
/**
* Gets the Gst.EncodingProfile for this transcoder.
*
* @return the Gst.EncodingProfile for this transcoder.
*/
protected abstract EncodingProfile get_encoding_profile ();
private bool on_autoplug_continue (Element decodebin,
Pad new_pad,
Caps caps) {
Gst.Pad sinkpad = null;
Signal.emit_by_name (this.encoder, "request-pad", caps, out sinkpad);
if (sinkpad == null) {
return true;
}
return false;
}
private void on_decoder_pad_added (Element decodebin, Pad new_pad) {
Gst.Pad sinkpad;
sinkpad = this.encoder.get_compatible_pad (new_pad, null);
if (sinkpad == null) {
var caps = new_pad.get_caps_reffed ();
Signal.emit_by_name (this.encoder, "request-pad", caps, out sinkpad);
}
if (sinkpad == null) {
debug ("No compatible encodebin pad found for pad '%s', ignoring..",
new_pad.name);
return;
}
var pad_link_ok = (new_pad.link (sinkpad) == PadLinkReturn.OK);
if (!pad_link_ok) {
warning ("Failed to link pad '%s' to '%s'",
new_pad.name,
sinkpad.name);
} else {
this.link_failed = false;
}
return;
}
private const string description = "Encoder and decoder are not " +
"compatible";
private void on_no_more_pads (Element decodebin) {
// We haven't found any pads we could link
if (this.link_failed) {
// Signalize that error
var bin = this.encoder.get_parent () as Bin;
var error = new IOError.FAILED ("Could not link");
var message = new Message.error (bin,
error,
description);
var bus = bin.get_bus ();
bus.post (message);
}
}
}
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