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author | Jens Georg <jensg@openismus.org> | 2012-09-12 14:25:24 +0200 |
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committer | Jens Georg <jensg@openismus.com> | 2012-10-05 17:33:28 +0200 |
commit | 21af74d799944290f9faaef744f71a1450b40320 (patch) | |
tree | 5a6924525d55cff7831b98b99ca97331d291991c /src/media-engines/gstreamer/rygel-l16-transcoder.vala | |
parent | 3c11305e5bed40b3e6edff7229bec471fe22a3ae (diff) | |
download | rygel-21af74d799944290f9faaef744f71a1450b40320.tar.gz |
server,engine: Move MediaEngine into .so
Diffstat (limited to 'src/media-engines/gstreamer/rygel-l16-transcoder.vala')
-rw-r--r-- | src/media-engines/gstreamer/rygel-l16-transcoder.vala | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/media-engines/gstreamer/rygel-l16-transcoder.vala b/src/media-engines/gstreamer/rygel-l16-transcoder.vala new file mode 100644 index 00000000..54516f5f --- /dev/null +++ b/src/media-engines/gstreamer/rygel-l16-transcoder.vala @@ -0,0 +1,101 @@ +/* + * Copyright (C) 2009 Nokia Corporation. + * + * Author: Zeeshan Ali (Khattak) <zeeshanak@gnome.org> + * <zeeshan.ali@nokia.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; +using Gee; + +/** + * Transcoder for linear PCM audio (LPCM). + */ +internal class Rygel.L16Transcoder : Rygel.AudioTranscoder { + private const int CHANNELS = 2; + private const int FREQUENCY = 44100; + private const int WIDTH = 16; + private const int DEPTH = 16; + private const bool SIGNED = true; + private const int ENDIANNESS = ByteOrder.BIG_ENDIAN; + + public L16Transcoder () { + var mime_type = "audio/L" + L16Transcoder.WIDTH.to_string () + + ";rate=" + L16Transcoder.FREQUENCY.to_string () + + ";channels=" + L16Transcoder.CHANNELS.to_string (); + + var caps_str = "audio/x-raw-int" + + ",channels=" + CHANNELS.to_string () + + ",rate=" + FREQUENCY.to_string () + + ",width=" + WIDTH.to_string () + + ",depth=" + DEPTH.to_string () + + ",signed=" + SIGNED.to_string () + + ",endianness=" + ENDIANNESS.to_string(); + + base (mime_type, + "LPCM", + 0, + AudioTranscoder.NO_CONTAINER, + caps_str, + "lpcm"); + } + + public override DIDLLiteResource? add_resource (DIDLLiteItem didl_item, + MediaItem item, + TranscodeManager manager) + throws Error { + var resource = base.add_resource (didl_item, item, manager); + if (resource == null) { + return null; + } + + resource.sample_freq = L16Transcoder.FREQUENCY; + resource.audio_channels = L16Transcoder.CHANNELS; + resource.bits_per_sample = L16Transcoder.WIDTH; + // Set bitrate in bytes/second + resource.bitrate = L16Transcoder.FREQUENCY * + L16Transcoder.CHANNELS * + L16Transcoder.WIDTH / 8; + + return resource; + } + + public override uint get_distance (MediaItem item) { + if (!(item is AudioItem) || item is VideoItem) { + return uint.MAX; + } + + var audio_item = item as AudioItem; + var distance = uint.MIN; + + if (audio_item.sample_freq > 0) { + distance += (audio_item.sample_freq - FREQUENCY).abs (); + } + + if (audio_item.channels > 0) { + distance += (audio_item.channels - CHANNELS).abs (); + } + + if (audio_item.bits_per_sample > 0) { + distance += (audio_item.bits_per_sample - WIDTH).abs (); + } + + return distance; + } +} |