| /* GStreamer | |
| * Copyright (C) <2021> Collabora Ltd. | |
| * Author: Nicolas Dufresne <nicolas.dufresne@collabora.com> | |
| * | |
| * This library is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Library General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2 of the License, or (at your option) any later version. | |
| * | |
| * This library 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 | |
| * Library General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Library General Public | |
| * License along with this library; if not, write to the | |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, | |
| * Boston, MA 02110-1301, USA. | |
| */ | |
| /** | |
| * SECTION:plugin-codecalpha | |
| * | |
| * This plugin contains a set of utilities that helps handling alpha encoded | |
| * streams as produced by some WebM streams using VP8/VP9. The elements are | |
| * meant to be used in decoder wrappers which allows playbin to automatically | |
| * handle these streams. | |
| * | |
| * `codecalphademux` will produce two streams out of a stream of buffers holding | |
| * the #GstVideoCodecAlphaMeta. The presence of the meta is indicated by the | |
| * usage of the field `codec-alpha=(boolean)true` in the caps. This is only | |
| * applicable to VP8 and VP9 for now. | |
| * | |
| * Wrappers for vp8dec and vp9dec are available, allowing seamless support for | |
| * these streams inside playbin (which is used by WebKit GTK and WPE). | |
| * | |
| * Since: 1.20 | |
| */ | |
| #ifdef HAVE_CONFIG_H | |
| # include <config.h> | |
| #endif | |
| #include <gst/gst.h> | |
| #include "gstcodecalphademux.h" | |
| #include "gstalphacombine.h" | |
| #include "gstvp8alphadecodebin.h" | |
| #include "gstvp9alphadecodebin.h" | |
| /* When wrapping, use the original rank plus this offset. The ad-hoc rules is | |
| * that hardware implementation will use PRIMARY+1 or +2 to override the | |
| * software decoder, so the offset must be large enough to jump over those. | |
| * This should also be small enough so that a marginal (64) or secondary | |
| * wrapper does not cross the PRIMARY line. | |
| */ | |
| #define RANK_OFFSET 10 | |
| static gboolean | |
| plugin_init (GstPlugin * plugin) | |
| { | |
| gboolean ret = FALSE; | |
| ret |= GST_ELEMENT_REGISTER (codec_alpha_demux, plugin); | |
| ret |= GST_ELEMENT_REGISTER (alpha_combine, plugin); | |
| ret |= GST_ELEMENT_REGISTER (vp8_alpha_decode_bin, plugin); | |
| ret |= GST_ELEMENT_REGISTER (vp9_alpha_decode_bin, plugin); | |
| return ret; | |
| } | |
| GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, | |
| GST_VERSION_MINOR, | |
| codecalpha, | |
| "CODEC Alpha Utilities", | |
| plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN) |