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/*
* Copyright (C) 2011 Nokia Corporation.
* Copyright (C) 2012 Intel Corporation.
* Copyright (C) 2013 Cable Television Laboratories, Inc.
*
* Author: Jens Georg <jensg@openismus.com>
* Prasanna Modem <prasanna@ecaspia.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 2.1 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
using Gst;
using Gst.PbUtils;
using GUPnP;
/**
* Base class for all transcoders that handle audio.
*/
internal abstract class Rygel.AudioTranscoder : Rygel.GstTranscoder {
protected int audio_bitrate;
protected Caps container_format = null;
protected Caps audio_codec_format = null;
public const string NO_CONTAINER = null;
public AudioTranscoder (string name,
string content_type,
string dlna_profile,
int audio_bitrate,
string? container_caps,
string audio_codec_caps,
string extension) {
base (name, content_type, dlna_profile, extension);
this.audio_bitrate = audio_bitrate;
if (container_caps != null) {
this.container_format = Caps.from_string (container_caps);
}
this.audio_codec_format = Caps.from_string (audio_codec_caps);
}
public AudioTranscoder.with_class (string name,
string content_type,
string dlna_profile,
int audio_bitrate,
string? container_caps,
string audio_codec_caps,
string extension) {
base (name, content_type, dlna_profile, extension);
this.audio_bitrate = audio_bitrate;
if (container_caps != null) {
this.container_format = Caps.from_string (container_caps);
}
this.audio_codec_format = Caps.from_string (audio_codec_caps);
}
public override uint get_distance (MediaFileItem item) {
if (!(item is AudioItem) || item is VideoItem) {
return uint.MAX;
}
var audio_item = item as AudioItem;
var distance = uint.MIN;
if (audio_item.bitrate > 0) {
distance += (audio_item.bitrate - this.audio_bitrate).abs ();
}
return distance;
}
protected override EncodingProfile get_encoding_profile
(MediaFileItem item) {
var enc_audio_profile = new EncodingAudioProfile (audio_codec_format,
this.preset,
null,
1);
enc_audio_profile.set_name ("audio");
if (this.container_format != null) {
var enc_container_profile = new EncodingContainerProfile ("container",
null,
container_format,
this.preset);
enc_container_profile.add_profile (enc_audio_profile);
return enc_container_profile;
}
return enc_audio_profile;
}
public override MediaResource? get_resource_for_item (MediaFileItem item) {
var resource = base.get_resource_for_item (item);
if (resource == null) {
return null;
}
resource.sample_freq = this.audio_bitrate;
return resource;
}
}
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