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189 lines
5.5 KiB
C
189 lines
5.5 KiB
C
/* GStreamer Editing Services
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* Copyright (C) <2013> Thibault Saunier <thibault.saunier@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: gesvideotrack
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* @title: GESVideoTrack
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* @short_description: A standard GESTrack for raw video
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*
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* A #GESVideoTrack is a default video #GESTrack, with a
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* #GES_TRACK_TYPE_VIDEO #GESTrack:track-type and "video/x-raw(ANY)"
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* #GESTrack:caps.
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*
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* By default, a video track will have its #GESTrack:restriction-caps
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* set to "video/x-raw" with the following properties:
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*
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* - width: 1280
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* - height: 720
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* - framerate: 30/1
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*
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* These fields are needed for negotiation purposes, but you can change
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* their values if you wish. It is advised that you do so using
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* ges_track_update_restriction_caps() with new values for the fields you
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* wish to change, and any additional fields you may want to add. Unlike
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* using ges_track_set_restriction_caps(), this will ensure that these
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* default fields will at least have some value set.
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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 "ges-video-track.h"
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#include "ges-smart-video-mixer.h"
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#include "ges-internal.h"
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#define DEFAULT_RESTRICTION_CAPS "video/x-raw(ANY), framerate=" G_STRINGIFY(DEFAULT_FRAMERATE_N) "/" G_STRINGIFY(DEFAULT_FRAMERATE_D) ", width=" G_STRINGIFY(DEFAULT_WIDTH) ", height=" G_STRINGIFY(DEFAULT_HEIGHT)
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struct _GESVideoTrackPrivate
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{
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gpointer nothing;
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};
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G_DEFINE_TYPE_WITH_PRIVATE (GESVideoTrack, ges_video_track, GES_TYPE_TRACK);
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static void
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_sync_capsfilter_with_track (GESTrack * track, GstElement * capsfilter)
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{
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GstCaps *restriction, *caps;
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gint fps_n, fps_d;
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GstStructure *structure;
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g_object_get (track, "restriction-caps", &restriction, NULL);
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if (restriction == NULL)
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return;
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if (gst_caps_get_size (restriction) == 0)
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goto done;
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structure = gst_caps_get_structure (restriction, 0);
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if (!gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d))
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goto done;
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caps =
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gst_caps_new_simple ("video/x-raw", "framerate", GST_TYPE_FRACTION, fps_n,
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fps_d, NULL);
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g_object_set (capsfilter, "caps", caps, NULL);
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gst_caps_unref (caps);
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done:
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gst_caps_unref (restriction);
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}
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static void
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_track_restriction_changed_cb (GESTrack * track, GParamSpec * arg G_GNUC_UNUSED,
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GstElement * capsfilter)
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{
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_sync_capsfilter_with_track (track, capsfilter);
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}
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static void
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_weak_notify_cb (GESTrack * track, GstElement * capsfilter)
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{
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g_signal_handlers_disconnect_by_func (track,
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(GCallback) _track_restriction_changed_cb, capsfilter);
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}
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static GstElement *
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create_element_for_raw_video_gap (GESTrack * track)
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{
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GstElement *bin;
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GstElement *capsfilter;
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bin = gst_parse_bin_from_description
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("videotestsrc pattern=2 name=src ! videorate ! capsfilter name=gapfilter caps=video/x-raw",
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TRUE, NULL);
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capsfilter = gst_bin_get_by_name (GST_BIN (bin), "gapfilter");
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g_object_weak_ref (G_OBJECT (capsfilter), (GWeakNotify) _weak_notify_cb,
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track);
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g_signal_connect (track, "notify::restriction-caps",
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(GCallback) _track_restriction_changed_cb, capsfilter);
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_sync_capsfilter_with_track (track, capsfilter);
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gst_object_unref (capsfilter);
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return bin;
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}
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static void
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ges_video_track_init (GESVideoTrack * ges_video_track)
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{
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/* GESVideoTrackPrivate *priv = GES_VIDEO_TRACK_GET_PRIVATE (ges_video_track);
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*/
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/* TODO: Add initialization code here */
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}
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static void
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ges_video_track_finalize (GObject * object)
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{
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/* TODO: Add deinitalization code here */
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G_OBJECT_CLASS (ges_video_track_parent_class)->finalize (object);
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}
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static void
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ges_video_track_class_init (GESVideoTrackClass * klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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/* GESTrackClass *parent_class = GES_TRACK_CLASS (klass);
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*/
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object_class->finalize = ges_video_track_finalize;
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GES_TRACK_CLASS (klass)->get_mixing_element = ges_smart_mixer_new;
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}
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/**
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* ges_video_track_new:
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*
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* Creates a new video track, with a #GES_TRACK_TYPE_VIDEO
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* #GESTrack:track-type and "video/x-raw(ANY)" #GESTrack:caps, and
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* "video/x-raw" #GESTrack:restriction-caps with the properties:
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*
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* - width: 1280
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* - height: 720
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* - framerate: 30/1
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*
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* You should use ges_track_update_restriction_caps() if you wish to
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* modify these fields, or add additional ones.
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*
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* Returns: (transfer floating): The newly created video track.
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*/
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GESVideoTrack *
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ges_video_track_new (void)
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{
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GESVideoTrack *ret;
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GstCaps *caps = gst_caps_new_empty_simple ("video/x-raw");
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GstCaps *restriction_caps = gst_caps_from_string (DEFAULT_RESTRICTION_CAPS);
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ret = g_object_new (GES_TYPE_VIDEO_TRACK, "track-type", GES_TRACK_TYPE_VIDEO,
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"caps", caps, NULL);
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ges_track_set_create_element_for_gap_func (GES_TRACK (ret),
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create_element_for_raw_video_gap);
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ges_track_set_restriction_caps (GES_TRACK (ret), restriction_caps);
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gst_caps_unref (caps);
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gst_caps_unref (restriction_caps);
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return ret;
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}
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