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286 lines
8 KiB
C
286 lines
8 KiB
C
/* GStreamer video sink base class
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* Copyright (C) <2003> Julien Moutte <julien@moutte.net>
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* Copyright (C) <2009> Tim-Philipp Müller <tim centricular net>
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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:gstvideosink
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* @short_description: Base class for video sinks
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*
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* <refsect2>
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* <para>
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* Provides useful functions and a base class for video sinks.
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* </para>
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* <para>
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* GstVideoSink will configure the default base sink to drop frames that
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* arrive later than 20ms as this is considered the default threshold for
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* observing out-of-sync frames.
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* </para>
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* </refsect2>
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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 "gstvideosink.h"
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enum
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{
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PROP_SHOW_PREROLL_FRAME = 1
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};
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#define DEFAULT_SHOW_PREROLL_FRAME TRUE
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struct _GstVideoSinkPrivate
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{
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gboolean show_preroll_frame; /* ATOMIC */
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};
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GST_DEBUG_CATEGORY_STATIC (video_sink_debug);
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#define GST_CAT_DEFAULT video_sink_debug
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static GstBaseSinkClass *parent_class = NULL;
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static void gst_video_sink_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_video_sink_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_video_sink_show_preroll_frame (GstBaseSink * bsink,
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GstBuffer * buf);
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static GstFlowReturn gst_video_sink_show_frame (GstBaseSink * bsink,
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GstBuffer * buf);
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/**
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* gst_video_sink_center_rect:
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* @src: the #GstVideoRectangle describing the source area
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* @dst: the #GstVideoRectangle describing the destination area
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* @result: a pointer to a #GstVideoRectangle which will receive the result area
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* @scaling: a #gboolean indicating if scaling should be applied or not
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*
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* Takes @src rectangle and position it at the center of @dst rectangle with or
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* without @scaling. It handles clipping if the @src rectangle is bigger than
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* the @dst one and @scaling is set to FALSE.
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*/
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void
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gst_video_sink_center_rect (GstVideoRectangle src, GstVideoRectangle dst,
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GstVideoRectangle * result, gboolean scaling)
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{
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g_return_if_fail (result != NULL);
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if (!scaling) {
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result->w = MIN (src.w, dst.w);
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result->h = MIN (src.h, dst.h);
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result->x = (dst.w - result->w) / 2;
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result->y = (dst.h - result->h) / 2;
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} else {
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gdouble src_ratio, dst_ratio;
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src_ratio = (gdouble) src.w / src.h;
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dst_ratio = (gdouble) dst.w / dst.h;
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if (src_ratio > dst_ratio) {
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result->w = dst.w;
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result->h = dst.w / src_ratio;
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result->x = 0;
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result->y = (dst.h - result->h) / 2;
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} else if (src_ratio < dst_ratio) {
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result->w = dst.h * src_ratio;
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result->h = dst.h;
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result->x = (dst.w - result->w) / 2;
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result->y = 0;
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} else {
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result->x = 0;
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result->y = 0;
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result->w = dst.w;
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result->h = dst.h;
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}
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}
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GST_DEBUG ("source is %dx%d dest is %dx%d, result is %dx%d with x,y %dx%d",
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src.w, src.h, dst.w, dst.h, result->w, result->h, result->x, result->y);
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}
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/* Initing stuff */
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static void
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gst_video_sink_init (GstVideoSink * videosink)
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{
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videosink->width = 0;
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videosink->height = 0;
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/* 20ms is more than enough, 80-130ms is noticable */
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gst_base_sink_set_max_lateness (GST_BASE_SINK (videosink), 20 * GST_MSECOND);
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gst_base_sink_set_qos_enabled (GST_BASE_SINK (videosink), TRUE);
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videosink->priv = G_TYPE_INSTANCE_GET_PRIVATE (videosink,
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GST_TYPE_VIDEO_SINK, GstVideoSinkPrivate);
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}
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static void
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gst_video_sink_class_init (GstVideoSinkClass * klass)
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{
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GstBaseSinkClass *basesink_class = (GstBaseSinkClass *) klass;
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GObjectClass *gobject_class = (GObjectClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_video_sink_set_property;
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gobject_class->get_property = gst_video_sink_get_property;
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/**
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* GstVideoSink:show-preroll-frame:
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*
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* Whether to show video frames during preroll. If set to #FALSE, video
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* frames will only be rendered in PLAYING state.
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*/
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g_object_class_install_property (gobject_class, PROP_SHOW_PREROLL_FRAME,
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g_param_spec_boolean ("show-preroll-frame", "Show preroll frame",
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"Whether to render video frames during preroll",
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DEFAULT_SHOW_PREROLL_FRAME,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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basesink_class->render = GST_DEBUG_FUNCPTR (gst_video_sink_show_frame);
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basesink_class->preroll =
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GST_DEBUG_FUNCPTR (gst_video_sink_show_preroll_frame);
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g_type_class_add_private (klass, sizeof (GstVideoSinkPrivate));
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}
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static void
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gst_video_sink_base_init (gpointer g_class)
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{
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GST_DEBUG_CATEGORY_INIT (video_sink_debug, "videosink", 0, "GstVideoSink");
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}
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static GstFlowReturn
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gst_video_sink_show_preroll_frame (GstBaseSink * bsink, GstBuffer * buf)
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{
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GstVideoSinkClass *klass;
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GstVideoSink *vsink;
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gboolean do_show;
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vsink = GST_VIDEO_SINK_CAST (bsink);
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klass = GST_VIDEO_SINK_GET_CLASS (vsink);
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do_show = g_atomic_int_get (&vsink->priv->show_preroll_frame);
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if (G_UNLIKELY (!do_show)) {
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GST_DEBUG_OBJECT (bsink, "not rendering frame with ts=%" GST_TIME_FORMAT
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", preroll rendering disabled",
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
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}
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if (klass->show_frame == NULL || !do_show) {
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if (parent_class->preroll != NULL)
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return parent_class->preroll (bsink, buf);
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else
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return GST_FLOW_OK;
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}
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GST_LOG_OBJECT (bsink, "rendering frame, ts=%" GST_TIME_FORMAT,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
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return klass->show_frame (GST_VIDEO_SINK_CAST (bsink), buf);
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}
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static GstFlowReturn
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gst_video_sink_show_frame (GstBaseSink * bsink, GstBuffer * buf)
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{
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GstVideoSinkClass *klass;
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klass = GST_VIDEO_SINK_GET_CLASS (bsink);
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if (klass->show_frame == NULL) {
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if (parent_class->render != NULL)
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return parent_class->render (bsink, buf);
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else
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return GST_FLOW_OK;
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}
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GST_LOG_OBJECT (bsink, "rendering frame, ts=%" GST_TIME_FORMAT,
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GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
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return klass->show_frame (GST_VIDEO_SINK_CAST (bsink), buf);
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}
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static void
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gst_video_sink_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstVideoSink *vsink;
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vsink = GST_VIDEO_SINK (object);
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switch (prop_id) {
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case PROP_SHOW_PREROLL_FRAME:
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g_atomic_int_set (&vsink->priv->show_preroll_frame,
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g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_video_sink_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstVideoSink *vsink;
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vsink = GST_VIDEO_SINK (object);
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switch (prop_id) {
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case PROP_SHOW_PREROLL_FRAME:
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g_value_set_boolean (value,
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g_atomic_int_get (&vsink->priv->show_preroll_frame));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* Public methods */
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GType
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gst_video_sink_get_type (void)
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{
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static GType videosink_type = 0;
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if (!videosink_type) {
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static const GTypeInfo videosink_info = {
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sizeof (GstVideoSinkClass),
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gst_video_sink_base_init,
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NULL,
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(GClassInitFunc) gst_video_sink_class_init,
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NULL,
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NULL,
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sizeof (GstVideoSink),
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0,
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(GInstanceInitFunc) gst_video_sink_init,
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};
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videosink_type = g_type_register_static (GST_TYPE_BASE_SINK,
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"GstVideoSink", &videosink_info, 0);
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}
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return videosink_type;
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}
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