77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/* GStreamer
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* Copyright (C) <2021> Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:plugin-codecalpha
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*
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* This plugin contains a set of utilities that helps handling alpha encoded
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* streams as produced by some WebM streams using VP8/VP9. The elements are
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* meant to be used in decoder wrappers which allows playbin to automatically
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* handle these streams.
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*
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* `codecalphademux` will produce two streams out of a stream of buffers holding
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* the #GstVideoCodecAlphaMeta. The presence of the meta is indicated by the
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* usage of the field `codec-alpha=(boolean)true` in the caps. This is only
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* applicable to VP8 and VP9 for now.
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*
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* Wrappers for vp8dec and vp9dec are available, allowing seamless support for
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* these streams inside playbin (which is used by WebKit GTK and WPE).
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*
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* Since: 1.20
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gst/gst.h>
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#include "gstcodecalphademux.h"
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#include "gstalphacombine.h"
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#include "gstvp8alphadecodebin.h"
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#include "gstvp9alphadecodebin.h"
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/* When wrapping, use the original rank plus this offset. The ad-hoc rules is
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* that hardware implementation will use PRIMARY+1 or +2 to override the
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* software decoder, so the offset must be large enough to jump over those.
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* This should also be small enough so that a marginal (64) or secondary
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* wrapper does not cross the PRIMARY line.
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*/
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#define RANK_OFFSET 10
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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gboolean ret = FALSE;
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ret |= GST_ELEMENT_REGISTER (codec_alpha_demux, plugin);
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ret |= GST_ELEMENT_REGISTER (alpha_combine, plugin);
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ret |= GST_ELEMENT_REGISTER (vp8_alpha_decode_bin, plugin);
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ret |= GST_ELEMENT_REGISTER (vp9_alpha_decode_bin, plugin);
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return ret;
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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codecalpha,
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"CODEC Alpha Utilities",
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plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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