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241 lines
6.9 KiB
C
241 lines
6.9 KiB
C
/* GStreamer DVD subtitle parser
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* Copyright (C) 2007 Mark Nauwelaerts <mnauw@users.sourceforge.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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <gst/gst.h>
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#include "gstdvdsubparse.h"
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GST_DEBUG_CATEGORY_STATIC (dvdsubparse_debug);
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#define GST_CAT_DEFAULT dvdsubparse_debug
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("subpicture/x-dvd, parsed=(boolean)true")
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);
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("subpicture/x-dvd")
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);
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static void gst_dvd_sub_parse_finalize (GObject * object);
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static void gst_dvd_sub_parse_reset (GstDvdSubParse * parse);
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static gboolean gst_dvd_sub_parse_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static GstFlowReturn gst_dvd_sub_parse_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buf);
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static GstStateChangeReturn gst_dvd_sub_parse_change_state (GstElement *
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element, GstStateChange transition);
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#define gst_dvd_sub_parse_parent_class parent_class
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G_DEFINE_TYPE (GstDvdSubParse, gst_dvd_sub_parse, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE (dvdsubparse, "dvdsubparse", GST_RANK_NONE,
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GST_TYPE_DVD_SUB_PARSE);
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static void
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gst_dvd_sub_parse_class_init (GstDvdSubParseClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gobject_class->finalize = gst_dvd_sub_parse_finalize;
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GST_DEBUG_CATEGORY_INIT (dvdsubparse_debug, "dvdsubparse", 0,
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"DVD subtitle parser");
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_dvd_sub_parse_change_state);
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gst_element_class_add_static_pad_template (gstelement_class, &src_template);
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gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"DVD subtitle parser", "Codec/Parser/Subtitle",
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"Parses and packetizes DVD subtitle streams",
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"Mark Nauwelaerts <mnauw@users.sourceforge.net>");
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}
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static void
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gst_dvd_sub_parse_finalize (GObject * object)
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{
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GstDvdSubParse *parse = GST_DVD_SUB_PARSE (object);
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g_object_unref (parse->adapter);
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parse->adapter = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_dvd_sub_parse_init (GstDvdSubParse * parse)
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{
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parse->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
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gst_pad_set_chain_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_dvd_sub_parse_chain));
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gst_pad_set_event_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_dvd_sub_parse_event));
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gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
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parse->srcpad = gst_pad_new_from_static_template (&src_template, "src");
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gst_pad_use_fixed_caps (parse->srcpad);
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gst_pad_set_caps (parse->srcpad,
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gst_static_pad_template_get_caps (&src_template));
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gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
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/* remainder */
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parse->adapter = gst_adapter_new ();
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gst_dvd_sub_parse_reset (parse);
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}
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static void
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gst_dvd_sub_parse_reset (GstDvdSubParse * parse)
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{
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parse->needed = 0;
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parse->stamp = GST_CLOCK_TIME_NONE;
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gst_adapter_clear (parse->adapter);
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}
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static gboolean
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gst_dvd_sub_parse_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstDvdSubParse *parse;
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gboolean ret;
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parse = GST_DVD_SUB_PARSE (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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gst_event_unref (event);
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caps = gst_static_pad_template_get_caps (&src_template);
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gst_pad_push_event (parse->srcpad, gst_event_new_caps (caps));
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gst_caps_unref (caps);
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ret = TRUE;
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break;
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}
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case GST_EVENT_FLUSH_STOP:
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gst_dvd_sub_parse_reset (parse);
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/* fall-through */
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default:
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ret = gst_pad_event_default (pad, parent, event);
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break;
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}
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return ret;
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}
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static GstFlowReturn
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gst_dvd_sub_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
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{
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GstDvdSubParse *parse = GST_DVD_SUB_PARSE (parent);
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GstAdapter *adapter;
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GstBuffer *outbuf = NULL;
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GstFlowReturn ret = GST_FLOW_OK;
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adapter = parse->adapter;
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GST_LOG_OBJECT (parse, "%" G_GSIZE_FORMAT " bytes, ts: %" GST_TIME_FORMAT,
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gst_buffer_get_size (buf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
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gst_adapter_push (adapter, buf);
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if (!parse->needed) {
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guint8 data[2];
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gst_adapter_copy (adapter, data, 0, 2);
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parse->needed = GST_READ_UINT16_BE (data);
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}
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if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
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if (GST_CLOCK_TIME_IS_VALID (parse->stamp))
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/* normally, we expect only the first fragment to carry a timestamp */
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GST_WARNING_OBJECT (parse, "Received more timestamps than expected.");
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else
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parse->stamp = GST_BUFFER_TIMESTAMP (buf);
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}
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if (parse->needed) {
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guint av;
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av = gst_adapter_available (adapter);
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if (av >= parse->needed) {
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if (av > parse->needed) {
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/* normally, we expect several fragment, boundary aligned */
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GST_WARNING_OBJECT (parse, "Unexpected: needed %d, "
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"but more (%d) is available.", parse->needed, av);
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}
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outbuf = gst_adapter_take_buffer (adapter, parse->needed);
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/* decorate buffer */
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GST_BUFFER_TIMESTAMP (outbuf) = parse->stamp;
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/* reset state */
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parse->stamp = GST_CLOCK_TIME_NONE;
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parse->needed = 0;
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/* and send along */
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ret = gst_pad_push (parse->srcpad, outbuf);
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}
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}
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return ret;
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}
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static GstStateChangeReturn
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gst_dvd_sub_parse_change_state (GstElement * element, GstStateChange transition)
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{
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GstDvdSubParse *parse = GST_DVD_SUB_PARSE (element);
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GstStateChangeReturn ret;
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret != GST_STATE_CHANGE_SUCCESS)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_dvd_sub_parse_reset (parse);
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break;
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default:
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break;
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}
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return GST_STATE_CHANGE_SUCCESS;
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}
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