/* GStreamer DVD subtitle parser * Copyright (C) 2007 Mark Nauwelaerts * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include "gstdvdsubparse.h" GST_DEBUG_CATEGORY_STATIC (dvdsubparse_debug); #define GST_CAT_DEFAULT dvdsubparse_debug static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-dvd-subpicture, parsed=(boolean)true") ); static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-dvd-subpicture") ); static void gst_dvd_sub_parse_finalize (GObject * object); static void gst_dvd_sub_parse_reset (GstDvdSubParse * parse); static gboolean gst_dvd_sub_parse_event (GstPad * pad, GstEvent * event); static GstFlowReturn gst_dvd_sub_parse_chain (GstPad * pad, GstBuffer * buf); static GstStateChangeReturn gst_dvd_sub_parse_change_state (GstElement * element, GstStateChange transition); #define gst_dvd_sub_parse_parent_class parent_class G_DEFINE_TYPE (GstDvdSubParse, gst_dvd_sub_parse, GST_TYPE_ELEMENT); static void gst_dvd_sub_parse_class_init (GstDvdSubParseClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gobject_class->finalize = gst_dvd_sub_parse_finalize; GST_DEBUG_CATEGORY_INIT (dvdsubparse_debug, "dvdsubparse", 0, "DVD subtitle parser"); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_dvd_sub_parse_change_state); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&src_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sink_template)); gst_element_class_set_details_simple (gstelement_class, "DVD subtitle parser", "Codec/Parser/Subtitle", "Parses and packetizes DVD subtitle streams", "Mark Nauwelaerts "); } static void gst_dvd_sub_parse_finalize (GObject * object) { GstDvdSubParse *parse = GST_DVD_SUB_PARSE (object); g_object_unref (parse->adapter); parse->adapter = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_dvd_sub_parse_init (GstDvdSubParse * parse) { parse->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink"); gst_pad_set_chain_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_dvd_sub_parse_chain)); gst_pad_set_event_function (parse->sinkpad, GST_DEBUG_FUNCPTR (gst_dvd_sub_parse_event)); gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad); parse->srcpad = gst_pad_new_from_static_template (&src_template, "src"); gst_pad_use_fixed_caps (parse->srcpad); gst_pad_set_caps (parse->srcpad, gst_static_pad_template_get_caps (&src_template)); gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad); /* remainder */ parse->adapter = gst_adapter_new (); gst_dvd_sub_parse_reset (parse); } static void gst_dvd_sub_parse_reset (GstDvdSubParse * parse) { parse->needed = 0; parse->stamp = GST_CLOCK_TIME_NONE; gst_adapter_clear (parse->adapter); } static gboolean gst_dvd_sub_parse_event (GstPad * pad, GstEvent * event) { GstDvdSubParse *parse; gboolean ret; parse = GST_DVD_SUB_PARSE (gst_pad_get_parent (pad)); switch GST_EVENT_TYPE (event) { case GST_EVENT_FLUSH_STOP: gst_dvd_sub_parse_reset (parse); /* fall-through */ default: ret = gst_pad_event_default (pad, event); break; } gst_object_unref (parse); return ret; } static GstFlowReturn gst_dvd_sub_parse_chain (GstPad * pad, GstBuffer * buf) { GstDvdSubParse *parse = GST_DVD_SUB_PARSE (GST_PAD_PARENT (pad)); GstAdapter *adapter; GstBuffer *outbuf = NULL; GstFlowReturn ret = GST_FLOW_OK; adapter = parse->adapter; GST_LOG_OBJECT (parse, "%4u bytes, ts: %" GST_TIME_FORMAT, gst_buffer_get_size (buf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); gst_adapter_push (adapter, buf); if (!parse->needed) { guint8 data[2]; gst_adapter_copy (adapter, data, 0, 2); parse->needed = GST_READ_UINT16_BE (data); } if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) { if (GST_CLOCK_TIME_IS_VALID (parse->stamp)) /* normally, we expect only the first fragment to carry a timestamp */ GST_WARNING_OBJECT (parse, "Received more timestamps than expected."); else parse->stamp = GST_BUFFER_TIMESTAMP (buf); } if (parse->needed) { guint av; av = gst_adapter_available (adapter); if (av >= parse->needed) { if (av > parse->needed) { /* normally, we expect several fragment, boundary aligned */ GST_WARNING_OBJECT (parse, "Unexpected: needed %d, " "but more (%d) is available.", parse->needed, av); } outbuf = gst_adapter_take_buffer (adapter, parse->needed); /* decorate buffer */ GST_BUFFER_TIMESTAMP (outbuf) = parse->stamp; /* reset state */ parse->stamp = GST_CLOCK_TIME_NONE; parse->needed = 0; /* and send along */ ret = gst_pad_push (parse->srcpad, outbuf); } } return ret; } static GstStateChangeReturn gst_dvd_sub_parse_change_state (GstElement * element, GstStateChange transition) { GstDvdSubParse *parse = GST_DVD_SUB_PARSE (element); GstStateChangeReturn ret; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: case GST_STATE_CHANGE_READY_TO_PAUSED: break; case GST_STATE_CHANGE_PAUSED_TO_READY: break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); if (ret != GST_STATE_CHANGE_SUCCESS) return ret; switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_dvd_sub_parse_reset (parse); break; default: break; } return GST_STATE_CHANGE_SUCCESS; }