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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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b3034dba54
Original commit message from CVS: added check test suite for the controller fixed a doc typo
150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2005 Wim Taymans <wim@fluendo.com>
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*
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* gstpushsrc.c:
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstpushsrc
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* @short_description: Base class for push based source elements
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* @see_also: #GstBaseSrc
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*
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* This class is mostly usefull for elements that cannot do
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* random access, or at least very slowly. The source usually
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* prefers to push out a fixed size buffer.
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*
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* Classes extending this base class will usually be scheduled
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* in a push based mode. It the peer accepts to operate without
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* offsets and withing the limits of the allowed block size, this
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* class can operate in getrange based mode automatically.
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*
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* The subclass should extend the methods from the baseclass in
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* addition to the create method.
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*
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* Seeking, flushing, scheduling and sync is all handled by this
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* base class.
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*/
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#include <stdlib.h>
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#include <string.h>
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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 "gstpushsrc.h"
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#include "gsttypefindhelper.h"
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#include <gst/gstmarshal.h>
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GST_DEBUG_CATEGORY_STATIC (gst_push_src_debug);
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#define GST_CAT_DEFAULT gst_push_src_debug
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/* PushSrc signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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PROP_0,
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};
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static GstElementClass *parent_class = NULL;
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static void gst_push_src_base_init (gpointer g_class);
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static void gst_push_src_class_init (GstPushSrcClass * klass);
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static void gst_push_src_init (GstPushSrc * src, gpointer g_class);
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GType
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gst_push_src_get_type (void)
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{
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static GType push_src_type = 0;
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if (!push_src_type) {
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static const GTypeInfo push_src_info = {
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sizeof (GstPushSrcClass),
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(GBaseInitFunc) gst_push_src_base_init,
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NULL,
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(GClassInitFunc) gst_push_src_class_init,
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NULL,
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NULL,
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sizeof (GstPushSrc),
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0,
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(GInstanceInitFunc) gst_push_src_init,
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};
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push_src_type = g_type_register_static (GST_TYPE_BASE_SRC,
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"GstPushSrc", &push_src_info, G_TYPE_FLAG_ABSTRACT);
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}
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return push_src_type;
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}
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#if 0
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static const GstEventMask *gst_push_src_get_event_mask (GstPad * pad);
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#endif
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static GstFlowReturn gst_push_src_create (GstBaseSrc * bsrc, guint64 offset,
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guint length, GstBuffer ** ret);
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static void
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gst_push_src_base_init (gpointer g_class)
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{
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GST_DEBUG_CATEGORY_INIT (gst_push_src_debug, "pushsrc", 0, "pushsrc element");
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}
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static void
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gst_push_src_class_init (GstPushSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseSrcClass *gstbasesrc_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstbasesrc_class = (GstBaseSrcClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_BASE_SRC);
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gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_push_src_create);
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}
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static void
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gst_push_src_init (GstPushSrc * pushsrc, gpointer g_class)
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{
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}
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static GstFlowReturn
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gst_push_src_create (GstBaseSrc * bsrc, guint64 offset, guint length,
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GstBuffer ** ret)
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{
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GstFlowReturn fret;
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GstPushSrc *src;
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GstPushSrcClass *pclass;
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src = GST_PUSH_SRC (bsrc);
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pclass = GST_PUSH_SRC_GET_CLASS (src);
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if (pclass->create)
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fret = pclass->create (src, ret);
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else
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fret = GST_FLOW_ERROR;
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return fret;
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}
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