1/*
2 * Copyright (C) 2013 Cable Television Laboratories, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#if ENABLE(VIDEO) && USE(GSTREAMER) && ENABLE(VIDEO_TRACK)
28
29#include "TextSinkGStreamer.h"
30
31GST_DEBUG_CATEGORY_STATIC(webkitTextSinkDebug);
32#define GST_CAT_DEFAULT webkitTextSinkDebug
33
34#define webkit_text_sink_parent_class parent_class
35G_DEFINE_TYPE_WITH_CODE(WebKitTextSink, webkit_text_sink, GST_TYPE_APP_SINK,
36    GST_DEBUG_CATEGORY_INIT(webkitTextSinkDebug, "webkittextsink", 0,
37        "webkit text sink"));
38
39enum {
40    Prop0,
41    PropSync,
42    PropLast
43};
44
45static void webkit_text_sink_init(WebKitTextSink* sink)
46{
47    /* We want to get cues as quickly as possible so WebKit has time to handle them,
48     * and we don't want cues to block when they come in the wrong order. */
49    gst_base_sink_set_sync(GST_BASE_SINK(sink), false);
50}
51
52static void webkitTextSinkGetProperty(GObject*, guint /* propertyId */,
53    GValue*, GParamSpec*)
54{
55    /* Do nothing with PropSync */
56}
57
58static void webkitTextSinkSetProperty(GObject*, guint /* propertyId */,
59    const GValue*, GParamSpec*)
60{
61    /* Do nothing with PropSync */
62}
63
64static gboolean webkitTextSinkQuery(GstElement *element, GstQuery *query)
65{
66    switch (GST_QUERY_TYPE(query)) {
67    case GST_QUERY_DURATION:
68    case GST_QUERY_POSITION:
69        /* Ignore duration and position because we don't want the seek bar to be
70         * based on where the cues are. */
71        return false;
72    default:
73        WebKitTextSink* sink = WEBKIT_TEXT_SINK(element);
74        GstElement* parent = GST_ELEMENT(&sink->parent);
75        return GST_ELEMENT_CLASS(parent_class)->query(parent, query);
76    }
77}
78
79static void webkit_text_sink_class_init(WebKitTextSinkClass* klass)
80{
81    GObjectClass* gobjectClass = G_OBJECT_CLASS(klass);
82    GstElementClass* elementClass = GST_ELEMENT_CLASS(klass);
83
84    gst_element_class_set_metadata(elementClass, "WebKit text sink", "Generic",
85        "An appsink that ignores the sync property and position and duration queries",
86        "Brendan Long <b.long@cablelabs.com>");
87
88    gobjectClass->get_property = GST_DEBUG_FUNCPTR(webkitTextSinkGetProperty);
89    gobjectClass->set_property = GST_DEBUG_FUNCPTR(webkitTextSinkSetProperty);
90    elementClass->query = GST_DEBUG_FUNCPTR(webkitTextSinkQuery);
91
92    /* Override "sync" so playsink doesn't mess with our appsink */
93    g_object_class_override_property(gobjectClass, PropSync, "sync");
94}
95
96GstElement* webkitTextSinkNew()
97{
98    return GST_ELEMENT(g_object_new(WEBKIT_TYPE_TEXT_SINK, 0));
99}
100
101#endif // ENABLE(VIDEO) && USE(GSTREAMER) && ENABLE(VIDEO_TRACK)
102