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708 lines
21 KiB
C
708 lines
21 KiB
C
/*
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* gstcmmldec.c - GStreamer annodex CMML decoder
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* Copyright (C) 2005 Alessandro Decina
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*
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* Authors:
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* Alessandro Decina <alessandro@nnva.org>
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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:element-cmmldec
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* @see_also: cmmlenc, oggdemux
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*
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* Cmmldec extracts a CMML document from a CMML bitstream.<ulink
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* url="http://www.annodex.net/TR/draft-pfeiffer-cmml-02.html">CMML</ulink> is
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* an XML markup language for time-continuous data maintained by the <ulink
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* url="http:/www.annodex.org/">Annodex Foundation</ulink>.
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*
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* <refsect2>
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* <title>Example pipeline</title>
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* |[
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* gst-launch -v filesrc location=annotated.ogg ! oggdemux ! cmmldec ! filesink location=annotations.cmml
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* ]|
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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 <string.h>
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#include <glib.h>
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#include <gst/tag/tag.h>
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#include "gstannodex.h"
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#include "gstcmmltag.h"
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#include "gstcmmldec.h"
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#include "gstcmmlutils.h"
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GST_DEBUG_CATEGORY_STATIC (cmmldec);
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#define GST_CAT_DEFAULT cmmldec
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#define CMML_IDENT_HEADER_SIZE 29
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enum
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{
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ARG_0,
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GST_CMML_DEC_WAIT_CLIP_END
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};
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enum
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{
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LAST_SIGNAL
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};
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static GstStaticPadTemplate gst_cmml_dec_src_factory =
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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 ("text/x-cmml, encoded = (boolean) false")
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);
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static GstStaticPadTemplate gst_cmml_dec_sink_factory =
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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 ("text/x-cmml, encoded = (boolean) true")
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);
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/* GstCmmlDec */
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GST_BOILERPLATE (GstCmmlDec, gst_cmml_dec, GstElement, GST_TYPE_ELEMENT);
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static void gst_cmml_dec_get_property (GObject * dec, guint property_id,
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GValue * value, GParamSpec * pspec);
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static void gst_cmml_dec_set_property (GObject * dec, guint property_id,
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const GValue * value, GParamSpec * pspec);
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static const GstQueryType *gst_cmml_dec_query_types (GstPad * pad);
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static gboolean gst_cmml_dec_sink_query (GstPad * pad, GstQuery * query);
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static gboolean gst_cmml_dec_sink_event (GstPad * pad, GstEvent * event);
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static gboolean gst_cmml_dec_convert (GstPad * pad, GstFormat src_fmt,
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gint64 src_val, GstFormat * dest_fmt, gint64 * dest_val);
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static GstStateChangeReturn gst_cmml_dec_change_state (GstElement * element,
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GstStateChange transition);
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static GstFlowReturn gst_cmml_dec_chain (GstPad * pad, GstBuffer * buffer);
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static GstCmmlPacketType gst_cmml_dec_parse_packet_type (GstCmmlDec * dec,
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GstBuffer * buffer);
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static void gst_cmml_dec_parse_ident_header (GstCmmlDec * dec, GstBuffer * buf);
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static void gst_cmml_dec_parse_first_header (GstCmmlDec * dec, GstBuffer * buf);
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static void gst_cmml_dec_parse_preamble (GstCmmlDec * dec,
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guchar * preamble, guchar * cmml_root_element);
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static void gst_cmml_dec_parse_xml (GstCmmlDec * dec,
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guchar * data, guint size);
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static void gst_cmml_dec_parse_head (GstCmmlDec * dec, GstCmmlTagHead * head);
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static void gst_cmml_dec_parse_clip (GstCmmlDec * dec, GstCmmlTagClip * clip);
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static GstFlowReturn gst_cmml_dec_new_buffer (GstCmmlDec * dec,
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guchar * data, gint size, GstBuffer ** buffer);
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static void gst_cmml_dec_push_clip (GstCmmlDec * dec, GstCmmlTagClip * clip);
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static void gst_cmml_dec_send_clip_tag (GstCmmlDec * dec,
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GstCmmlTagClip * clip);
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static void gst_cmml_dec_finalize (GObject * object);
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static void
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gst_cmml_dec_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_static_pad_template (element_class,
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&gst_cmml_dec_sink_factory);
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gst_element_class_add_static_pad_template (element_class,
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&gst_cmml_dec_src_factory);
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gst_element_class_set_details_simple (element_class, "CMML stream decoder",
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"Codec/Decoder",
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"Decodes CMML streams", "Alessandro Decina <alessandro@nnva.org>");
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}
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static void
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gst_cmml_dec_class_init (GstCmmlDecClass * dec_class)
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{
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GObjectClass *klass = G_OBJECT_CLASS (dec_class);
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GST_ELEMENT_CLASS (klass)->change_state = gst_cmml_dec_change_state;
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klass->set_property = gst_cmml_dec_set_property;
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klass->get_property = gst_cmml_dec_get_property;
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klass->finalize = gst_cmml_dec_finalize;
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g_object_class_install_property (klass, GST_CMML_DEC_WAIT_CLIP_END,
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g_param_spec_boolean ("wait-clip-end-time",
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"Wait clip end time",
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"Send a tag for a clip when the clip ends, setting its end-time. "
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"Use when you need to know both clip's start-time and end-time.",
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FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_cmml_dec_init (GstCmmlDec * dec, GstCmmlDecClass * klass)
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{
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dec->sinkpad =
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gst_pad_new_from_static_template (&gst_cmml_dec_sink_factory, "sink");
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gst_pad_set_chain_function (dec->sinkpad, gst_cmml_dec_chain);
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gst_pad_set_query_type_function (dec->sinkpad, gst_cmml_dec_query_types);
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gst_pad_set_query_function (dec->sinkpad, gst_cmml_dec_sink_query);
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gst_pad_set_event_function (dec->sinkpad, gst_cmml_dec_sink_event);
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gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
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dec->srcpad =
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gst_pad_new_from_static_template (&gst_cmml_dec_src_factory, "src");
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gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
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dec->wait_clip_end = FALSE;
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}
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static void
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gst_cmml_dec_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstCmmlDec *dec = GST_CMML_DEC (object);
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switch (property_id) {
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case GST_CMML_DEC_WAIT_CLIP_END:
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g_value_set_boolean (value, dec->wait_clip_end);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
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}
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static void
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gst_cmml_dec_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstCmmlDec *dec = GST_CMML_DEC (object);
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switch (property_id) {
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case GST_CMML_DEC_WAIT_CLIP_END:
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dec->wait_clip_end = 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 (dec, property_id, pspec);
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}
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}
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static void
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gst_cmml_dec_finalize (GObject * object)
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{
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GstCmmlDec *dec = GST_CMML_DEC (object);
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if (dec->tracks) {
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gst_cmml_track_list_destroy (dec->tracks);
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dec->tracks = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static GstStateChangeReturn
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gst_cmml_dec_change_state (GstElement * element, GstStateChange transition)
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{
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GstCmmlDec *dec = GST_CMML_DEC (element);
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GstStateChangeReturn res;
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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dec->parser = gst_cmml_parser_new (GST_CMML_PARSER_DECODE);
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dec->parser->user_data = dec;
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dec->parser->preamble_callback =
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(GstCmmlParserPreambleCallback) gst_cmml_dec_parse_preamble;
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dec->parser->head_callback =
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(GstCmmlParserHeadCallback) gst_cmml_dec_parse_head;
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dec->parser->clip_callback =
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(GstCmmlParserClipCallback) gst_cmml_dec_parse_clip;
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dec->major = -1;
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dec->minor = -1;
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dec->granulerate_n = -1;
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dec->granulerate_d = -1;
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dec->granuleshift = 0;
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dec->granulepos = 0;
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dec->flow_return = GST_FLOW_OK;
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dec->sent_root = FALSE;
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dec->tracks = gst_cmml_track_list_new ();
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break;
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default:
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break;
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}
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res = parent_class->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_cmml_parser_free (dec->parser);
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gst_cmml_track_list_destroy (dec->tracks);
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dec->tracks = NULL;
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break;
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default:
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break;
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}
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return res;
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}
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static const GstQueryType *
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gst_cmml_dec_query_types (GstPad * pad)
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{
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static const GstQueryType query_types[] = {
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GST_QUERY_CONVERT,
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0
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};
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return query_types;
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}
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static gboolean
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gst_cmml_dec_sink_query (GstPad * pad, GstQuery * query)
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{
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gboolean res = FALSE;
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switch (GST_QUERY_TYPE (query)) {
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case GST_QUERY_CONVERT:
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{
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GstFormat src_fmt, dest_fmt;
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gint64 src_val, dest_val;
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gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
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res = gst_cmml_dec_convert (pad, src_fmt, src_val, &dest_fmt, &dest_val);
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if (res)
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gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
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break;
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}
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default:
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break;
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}
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return res;
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}
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static gboolean
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gst_cmml_dec_convert (GstPad * pad,
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GstFormat src_fmt, gint64 src_val, GstFormat * dest_fmt, gint64 * dest_val)
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{
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GstCmmlDec *dec = GST_CMML_DEC (GST_PAD_PARENT (pad));
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gboolean res = FALSE;
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switch (src_fmt) {
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case GST_FORMAT_DEFAULT:
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switch (*dest_fmt) {
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case GST_FORMAT_TIME:
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{
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*dest_val = gst_annodex_granule_to_time (src_val, dec->granulerate_n,
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dec->granulerate_d, dec->granuleshift);
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res = TRUE;
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break;
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}
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default:
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break;
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}
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break;
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default:
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break;
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}
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return res;
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}
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static gboolean
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gst_cmml_dec_sink_event (GstPad * pad, GstEvent * event)
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{
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GstCmmlDec *dec = GST_CMML_DEC (GST_PAD_PARENT (pad));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_EOS:
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{
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GstBuffer *buffer;
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GstCmmlTagClip *clip;
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GList *clips, *walk;
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GST_INFO_OBJECT (dec, "got EOS, flushing clips");
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/* since we output a clip when the next one in the same track is found, on
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* EOS we need to output the last clip (if any) of every track
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*/
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clips = gst_cmml_track_list_get_clips (dec->tracks);
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for (walk = clips; walk; walk = g_list_next (walk)) {
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clip = GST_CMML_TAG_CLIP (walk->data);
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gst_cmml_dec_push_clip (dec, clip);
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if (dec->wait_clip_end) {
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clip->end_time = dec->timestamp;
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gst_cmml_dec_send_clip_tag (dec, clip);
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}
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}
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g_list_free (clips);
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/* send the cmml end tag */
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dec->flow_return = gst_cmml_dec_new_buffer (dec,
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(guchar *) "</cmml>", strlen ("</cmml>"), &buffer);
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if (dec->flow_return == GST_FLOW_OK)
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dec->flow_return = gst_pad_push (dec->srcpad, buffer);
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if (dec->flow_return == GST_FLOW_NOT_LINKED)
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dec->flow_return = GST_FLOW_OK; /* Ignore NOT_LINKED */
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break;
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}
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default:
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break;
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}
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return gst_pad_event_default (pad, event);
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}
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static GstFlowReturn
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gst_cmml_dec_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstCmmlDec *dec = GST_CMML_DEC (GST_PAD_PARENT (pad));
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GstCmmlPacketType packet;
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if (GST_BUFFER_SIZE (buffer) == 0) {
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/* the EOS page could be empty */
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dec->flow_return = GST_FLOW_OK;
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goto done;
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}
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dec->granulepos = GST_BUFFER_OFFSET_END (buffer);
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dec->timestamp = gst_annodex_granule_to_time (dec->granulepos,
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dec->granulerate_n, dec->granulerate_d, dec->granuleshift);
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/* identify the packet type */
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packet = gst_cmml_dec_parse_packet_type (dec, buffer);
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/* handle the packet. the handler will set dec->flow_return */
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switch (packet) {
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case GST_CMML_PACKET_IDENT_HEADER:
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if (dec->sent_root == FALSE)
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/* don't parse the ident again in case of seeking to the beginning */
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gst_cmml_dec_parse_ident_header (dec, buffer);
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break;
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case GST_CMML_PACKET_FIRST_HEADER:
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if (dec->sent_root == FALSE)
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/* don't parse the xml preamble if it has already been parsed because it
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* would error out, so seeking to the beginning would fail */
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gst_cmml_dec_parse_first_header (dec, buffer);
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break;
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case GST_CMML_PACKET_SECOND_HEADER:
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case GST_CMML_PACKET_CLIP:
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gst_cmml_dec_parse_xml (dec,
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GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer));
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break;
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case GST_CMML_PACKET_UNKNOWN:
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default:
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GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL), ("unknown packet type"));
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dec->flow_return = GST_FLOW_ERROR;
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}
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done:
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gst_buffer_unref (buffer);
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return dec->flow_return;
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}
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/* finds the packet type of the buffer
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*/
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static GstCmmlPacketType
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gst_cmml_dec_parse_packet_type (GstCmmlDec * dec, GstBuffer * buffer)
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{
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GstCmmlPacketType packet_type = GST_CMML_PACKET_UNKNOWN;
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gchar *data = (gchar *) GST_BUFFER_DATA (buffer);
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guint size = GST_BUFFER_SIZE (buffer);
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if (size >= 8 && !memcmp (data, "CMML\0\0\0\0", 8)) {
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packet_type = GST_CMML_PACKET_IDENT_HEADER;
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} else if (size >= 5) {
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if (!strncmp (data, "<?xml", 5))
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packet_type = GST_CMML_PACKET_FIRST_HEADER;
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else if (!strncmp (data, "<head", 5))
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packet_type = GST_CMML_PACKET_SECOND_HEADER;
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else if (!strncmp (data, "<clip", 5))
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packet_type = GST_CMML_PACKET_CLIP;
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}
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return packet_type;
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}
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/* creates a new buffer and sets caps and timestamp on it
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*/
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static GstFlowReturn
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gst_cmml_dec_new_buffer (GstCmmlDec * dec,
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guchar * data, gint size, GstBuffer ** buffer)
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{
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GstFlowReturn res;
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res = gst_pad_alloc_buffer (dec->srcpad, GST_BUFFER_OFFSET_NONE,
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size, gst_static_pad_template_get_caps (&gst_cmml_dec_src_factory),
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buffer);
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if (res == GST_FLOW_OK) {
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if (data)
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memcpy (GST_BUFFER_DATA (*buffer), data, size);
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GST_BUFFER_TIMESTAMP (*buffer) = dec->timestamp;
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} else if (res == GST_FLOW_NOT_LINKED) {
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GST_DEBUG_OBJECT (dec, "alloc function return NOT-LINKED, ignoring");
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} else {
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GST_WARNING_OBJECT (dec, "alloc function returned error %s",
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gst_flow_get_name (res));
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}
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return res;
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}
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/* parses the first CMML packet (the ident header)
|
|
*/
|
|
static void
|
|
gst_cmml_dec_parse_ident_header (GstCmmlDec * dec, GstBuffer * buffer)
|
|
{
|
|
guint8 *data = GST_BUFFER_DATA (buffer);
|
|
|
|
/* the ident header has a fixed length */
|
|
if (GST_BUFFER_SIZE (buffer) != CMML_IDENT_HEADER_SIZE) {
|
|
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
|
|
(NULL), ("wrong ident header size: %d", GST_BUFFER_SIZE (buffer)));
|
|
dec->flow_return = GST_FLOW_ERROR;
|
|
|
|
return;
|
|
}
|
|
|
|
data += 8;
|
|
dec->major = GST_READ_UINT16_LE (data);
|
|
data += 2;
|
|
dec->minor = GST_READ_UINT16_LE (data);
|
|
data += 2;
|
|
dec->granulerate_n = GST_READ_UINT64_LE (data);
|
|
data += 8;
|
|
dec->granulerate_d = GST_READ_UINT64_LE (data);
|
|
data += 8;
|
|
dec->granuleshift = GST_READ_UINT8 (data);
|
|
|
|
GST_INFO_OBJECT (dec, "bitstream initialized "
|
|
"(major: %" G_GINT16_FORMAT " minor: %" G_GINT16_FORMAT
|
|
" granulerate_n: %" G_GINT64_FORMAT " granulerate_d: %" G_GINT64_FORMAT
|
|
" granuleshift: %d)",
|
|
dec->major, dec->minor,
|
|
dec->granulerate_n, dec->granulerate_d, dec->granuleshift);
|
|
|
|
dec->flow_return = GST_FLOW_OK;
|
|
}
|
|
|
|
/* parses the first secondary header.
|
|
* the first secondary header contains the xml version, the doctype and the
|
|
* optional "cmml" processing instruction.
|
|
*/
|
|
static void
|
|
gst_cmml_dec_parse_first_header (GstCmmlDec * dec, GstBuffer * buffer)
|
|
{
|
|
gst_cmml_dec_parse_xml (dec,
|
|
GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer));
|
|
|
|
/* if there is a processing instruction, gst_cmml_dec_parse_preamble
|
|
* will be triggered. Otherwise we need to call it manually.
|
|
*/
|
|
if (dec->flow_return == GST_FLOW_OK && !dec->sent_root) {
|
|
guchar *preamble = (guchar *) g_strndup ((gchar *) GST_BUFFER_DATA (buffer),
|
|
GST_BUFFER_SIZE (buffer));
|
|
|
|
gst_cmml_dec_parse_preamble (dec, preamble, (guchar *) "<cmml>");
|
|
g_free (preamble);
|
|
}
|
|
}
|
|
|
|
/* feeds data into the cmml parser.
|
|
*/
|
|
static void
|
|
gst_cmml_dec_parse_xml (GstCmmlDec * dec, guchar * data, guint size)
|
|
{
|
|
GError *err = NULL;
|
|
|
|
if (!gst_cmml_parser_parse_chunk (dec->parser, (gchar *) data, size, &err)) {
|
|
GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL), ("%s", err->message));
|
|
g_error_free (err);
|
|
dec->flow_return = GST_FLOW_ERROR;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_cmml_dec_parse_preamble (GstCmmlDec * dec, guchar * preamble,
|
|
guchar * root_element)
|
|
{
|
|
GstBuffer *buffer;
|
|
guchar *encoded_preamble;
|
|
|
|
encoded_preamble = (guchar *) g_strconcat ((gchar *) preamble,
|
|
(gchar *) root_element, NULL);
|
|
|
|
/* send the root element to the internal parser */
|
|
gst_cmml_dec_parse_xml (dec, root_element, strlen ((gchar *) root_element));
|
|
dec->sent_root = TRUE;
|
|
|
|
/* push the root element */
|
|
dec->flow_return = gst_cmml_dec_new_buffer (dec,
|
|
encoded_preamble, strlen ((gchar *) encoded_preamble), &buffer);
|
|
if (dec->flow_return == GST_FLOW_OK) {
|
|
dec->flow_return = gst_pad_push (dec->srcpad, buffer);
|
|
}
|
|
|
|
if (dec->flow_return == GST_FLOW_OK) {
|
|
GST_INFO_OBJECT (dec, "preamble parsed");
|
|
}
|
|
|
|
g_free (encoded_preamble);
|
|
return;
|
|
}
|
|
|
|
/* outputs the cmml head element and send TITLE and CMML_HEAD tags.
|
|
* This callback is registered with dec->parser. It is called when the
|
|
* head element is parsed.
|
|
*/
|
|
static void
|
|
gst_cmml_dec_parse_head (GstCmmlDec * dec, GstCmmlTagHead * head)
|
|
{
|
|
GstTagList *tags;
|
|
GValue str_val = { 0 }, title_val = {
|
|
0};
|
|
guchar *head_str;
|
|
GstBuffer *buffer;
|
|
|
|
GST_DEBUG_OBJECT (dec, "found CMML head (title: %s base: %s)",
|
|
head->title, head->base);
|
|
|
|
/* create the GST_TAG_TITLE tag */
|
|
g_value_init (&str_val, G_TYPE_STRING);
|
|
g_value_init (&title_val, gst_tag_get_type (GST_TAG_TITLE));
|
|
g_value_set_string (&str_val, (gchar *) head->title);
|
|
g_value_transform (&str_val, &title_val);
|
|
|
|
tags = gst_tag_list_new ();
|
|
gst_tag_list_add_values (tags, GST_TAG_MERGE_APPEND,
|
|
GST_TAG_TITLE, &title_val, NULL);
|
|
gst_tag_list_add (tags, GST_TAG_MERGE_APPEND, GST_TAG_CMML_HEAD, head, NULL);
|
|
gst_element_found_tags_for_pad (GST_ELEMENT (dec), dec->srcpad, tags);
|
|
|
|
g_value_unset (&str_val);
|
|
g_value_unset (&title_val);
|
|
|
|
head_str = gst_cmml_parser_tag_head_to_string (dec->parser, head);
|
|
|
|
dec->flow_return = gst_cmml_dec_new_buffer (dec,
|
|
head_str, strlen ((gchar *) head_str), &buffer);
|
|
g_free (head_str);
|
|
if (dec->flow_return == GST_FLOW_OK)
|
|
dec->flow_return = gst_pad_push (dec->srcpad, buffer);
|
|
if (dec->flow_return == GST_FLOW_NOT_LINKED)
|
|
dec->flow_return = GST_FLOW_OK; /* Ignore NOT_LINKED */
|
|
}
|
|
|
|
/* send a TAG_MESSAGE event for a clip */
|
|
static void
|
|
gst_cmml_dec_send_clip_tag (GstCmmlDec * dec, GstCmmlTagClip * clip)
|
|
{
|
|
GstTagList *tags;
|
|
|
|
GST_DEBUG_OBJECT (dec, "sending clip tag %s", clip->id);
|
|
|
|
tags = gst_tag_list_new ();
|
|
gst_tag_list_add (tags, GST_TAG_MERGE_APPEND, GST_TAG_CMML_CLIP, clip, NULL);
|
|
gst_element_found_tags_for_pad (GST_ELEMENT (dec), dec->srcpad, tags);
|
|
}
|
|
|
|
/* push the string representation of a clip */
|
|
static void
|
|
gst_cmml_dec_push_clip (GstCmmlDec * dec, GstCmmlTagClip * clip)
|
|
{
|
|
GstBuffer *buffer;
|
|
guchar *clip_str;
|
|
|
|
GST_DEBUG_OBJECT (dec, "pushing clip %s", clip->id);
|
|
|
|
clip_str = gst_cmml_parser_tag_clip_to_string (dec->parser, clip);
|
|
dec->flow_return = gst_cmml_dec_new_buffer (dec,
|
|
clip_str, strlen ((gchar *) clip_str), &buffer);
|
|
if (dec->flow_return == GST_FLOW_OK)
|
|
dec->flow_return = gst_pad_push (dec->srcpad, buffer);
|
|
if (dec->flow_return == GST_FLOW_NOT_LINKED)
|
|
dec->flow_return = GST_FLOW_OK; /* Ignore NOT_LINKED */
|
|
|
|
g_free (clip_str);
|
|
}
|
|
|
|
/* decode a clip tag
|
|
* this callback is registered with dec->parser. It is called whenever a
|
|
* clip is parsed.
|
|
*/
|
|
static void
|
|
gst_cmml_dec_parse_clip (GstCmmlDec * dec, GstCmmlTagClip * clip)
|
|
{
|
|
GstCmmlTagClip *prev_clip;
|
|
|
|
dec->flow_return = GST_FLOW_OK;
|
|
|
|
if (clip->empty)
|
|
GST_INFO_OBJECT (dec, "parsing empty clip");
|
|
else
|
|
GST_INFO_OBJECT (dec, "parsing clip (id: %s)", clip->id);
|
|
|
|
clip->start_time = dec->timestamp;
|
|
if (clip->start_time == GST_CLOCK_TIME_NONE) {
|
|
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
|
|
(NULL), ("invalid clip start time"));
|
|
|
|
dec->flow_return = GST_FLOW_ERROR;
|
|
return;
|
|
}
|
|
|
|
/* get the last clip in the current track */
|
|
prev_clip = gst_cmml_track_list_get_track_last_clip (dec->tracks,
|
|
(gchar *) clip->track);
|
|
if (prev_clip) {
|
|
/* output the previous clip */
|
|
if (clip->empty)
|
|
/* the current clip marks the end of the previous one */
|
|
prev_clip->end_time = clip->start_time;
|
|
|
|
gst_cmml_dec_push_clip (dec, prev_clip);
|
|
}
|
|
|
|
if (dec->wait_clip_end) {
|
|
/* now it's time to send the tag for the previous clip */
|
|
if (prev_clip) {
|
|
prev_clip->end_time = clip->start_time;
|
|
gst_cmml_dec_send_clip_tag (dec, prev_clip);
|
|
}
|
|
} else if (!clip->empty) {
|
|
/* send the tag for the current clip */
|
|
gst_cmml_dec_send_clip_tag (dec, clip);
|
|
}
|
|
|
|
if (prev_clip)
|
|
gst_cmml_track_list_del_clip (dec->tracks, prev_clip);
|
|
|
|
if (!clip->empty)
|
|
if (!gst_cmml_track_list_has_clip (dec->tracks, clip))
|
|
gst_cmml_track_list_add_clip (dec->tracks, clip);
|
|
}
|
|
|
|
gboolean
|
|
gst_cmml_dec_plugin_init (GstPlugin * plugin)
|
|
{
|
|
if (!gst_element_register (plugin, "cmmldec", GST_RANK_PRIMARY,
|
|
GST_TYPE_CMML_DEC))
|
|
return FALSE;
|
|
|
|
GST_DEBUG_CATEGORY_INIT (cmmldec, "cmmldec", 0,
|
|
"annodex CMML decoding element");
|
|
|
|
return TRUE;
|
|
}
|