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628 lines
18 KiB
C
628 lines
18 KiB
C
/*
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* gstcmmlenc.c - GStreamer CMML encoder
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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-cmmlenc
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* @see_also: cmmldec, oggmux
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*
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* Cmmlenc encodes a CMML document into a CMML stream. <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=annotations.cmml ! cmmlenc ! oggmux name=mux ! filesink location=annotated.ogg
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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 "gstcmmlenc.h"
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#include "gstannodex.h"
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GST_DEBUG_CATEGORY_STATIC (cmmlenc);
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#define GST_CAT_DEFAULT cmmlenc
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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_ENC_GRANULERATE_N,
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GST_CMML_ENC_GRANULERATE_D,
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GST_CMML_ENC_GRANULESHIFT
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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_enc_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) true")
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);
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static GstStaticPadTemplate gst_cmml_enc_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) false")
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);
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GST_BOILERPLATE (GstCmmlEnc, gst_cmml_enc, GstElement, GST_TYPE_ELEMENT);
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static void gst_cmml_enc_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec);
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static void gst_cmml_enc_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec);
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static gboolean gst_cmml_enc_sink_event (GstPad * pad, GstEvent * event);
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static GstStateChangeReturn gst_cmml_enc_change_state (GstElement * element,
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GstStateChange transition);
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static GstFlowReturn gst_cmml_enc_chain (GstPad * pad, GstBuffer * buffer);
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static void gst_cmml_enc_parse_preamble (GstCmmlEnc * enc,
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guchar * preamble, guchar * processing_instruction);
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static void gst_cmml_enc_parse_end_tag (GstCmmlEnc * enc);
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static void gst_cmml_enc_parse_tag_head (GstCmmlEnc * enc,
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GstCmmlTagHead * head);
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static void gst_cmml_enc_parse_tag_clip (GstCmmlEnc * enc,
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GstCmmlTagClip * tag);
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static GstFlowReturn gst_cmml_enc_new_buffer (GstCmmlEnc * enc,
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guchar * data, gint size, GstBuffer ** buffer);
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static GstFlowReturn gst_cmml_enc_push_clip (GstCmmlEnc * enc,
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GstCmmlTagClip * clip, GstClockTime prev_clip_time);
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static GstFlowReturn gst_cmml_enc_push (GstCmmlEnc * enc, GstBuffer * buffer);
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static void gst_cmml_enc_finalize (GObject * object);
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static void
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gst_cmml_enc_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_pad_template (element_class,
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gst_static_pad_template_get (&gst_cmml_enc_sink_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_cmml_enc_src_factory));
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gst_element_class_set_details_simple (element_class, "CMML streams encoder",
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"Codec/Encoder",
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"Encodes CMML streams", "Alessandro Decina <alessandro@nnva.org>");
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}
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static void
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gst_cmml_enc_class_init (GstCmmlEncClass * enc_class)
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{
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GObjectClass *klass = G_OBJECT_CLASS (enc_class);
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klass->get_property = gst_cmml_enc_get_property;
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klass->set_property = gst_cmml_enc_set_property;
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klass->finalize = gst_cmml_enc_finalize;
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g_object_class_install_property (klass, GST_CMML_ENC_GRANULERATE_N,
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g_param_spec_int64 ("granule-rate-numerator",
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"Granulerate numerator",
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"Granulerate numerator",
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0, G_MAXINT64, 1000, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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g_object_class_install_property (klass, GST_CMML_ENC_GRANULERATE_D,
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g_param_spec_int64 ("granule-rate-denominator",
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"Granulerate denominator",
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"Granulerate denominator",
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0, G_MAXINT64, 1, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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g_object_class_install_property (klass, GST_CMML_ENC_GRANULESHIFT,
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g_param_spec_uchar ("granule-shift",
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"Granuleshift",
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"The number of lower bits to use for partitioning a granule position",
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0, 64, 32, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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GST_ELEMENT_CLASS (klass)->change_state = gst_cmml_enc_change_state;
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}
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static void
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gst_cmml_enc_init (GstCmmlEnc * enc, GstCmmlEncClass * klass)
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{
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enc->sinkpad =
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gst_pad_new_from_static_template (&gst_cmml_enc_sink_factory, "sink");
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gst_pad_set_chain_function (enc->sinkpad, gst_cmml_enc_chain);
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gst_pad_set_event_function (enc->sinkpad, gst_cmml_enc_sink_event);
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gst_element_add_pad (GST_ELEMENT (enc), enc->sinkpad);
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enc->srcpad =
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gst_pad_new_from_static_template (&gst_cmml_enc_src_factory, "src");
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gst_element_add_pad (GST_ELEMENT (enc), enc->srcpad);
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enc->major = 3;
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enc->minor = 0;
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}
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static void
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gst_cmml_enc_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstCmmlEnc *enc = GST_CMML_ENC (object);
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switch (property_id) {
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case GST_CMML_ENC_GRANULERATE_N:
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/* XXX: may need to flush clips */
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enc->granulerate_n = g_value_get_int64 (value);
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break;
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case GST_CMML_ENC_GRANULERATE_D:
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enc->granulerate_d = g_value_get_int64 (value);
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break;
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case GST_CMML_ENC_GRANULESHIFT:
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enc->granuleshift = g_value_get_uchar (value);
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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_enc_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstCmmlEnc *enc = GST_CMML_ENC (object);
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switch (property_id) {
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case GST_CMML_ENC_GRANULERATE_N:
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g_value_set_int64 (value, enc->granulerate_n);
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break;
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case GST_CMML_ENC_GRANULERATE_D:
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g_value_set_int64 (value, enc->granulerate_d);
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break;
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case GST_CMML_ENC_GRANULESHIFT:
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g_value_set_uchar (value, enc->granuleshift);
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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_enc_finalize (GObject * object)
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{
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GstCmmlEnc *enc = GST_CMML_ENC (object);
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if (enc->tracks) {
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gst_cmml_track_list_destroy (enc->tracks);
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enc->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_enc_change_state (GstElement * element, GstStateChange transition)
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{
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GstCmmlEnc *enc = GST_CMML_ENC (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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enc->parser = gst_cmml_parser_new (GST_CMML_PARSER_ENCODE);
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enc->parser->user_data = enc;
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enc->parser->preamble_callback =
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(GstCmmlParserPreambleCallback) gst_cmml_enc_parse_preamble;
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enc->parser->head_callback =
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(GstCmmlParserHeadCallback) gst_cmml_enc_parse_tag_head;
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enc->parser->clip_callback =
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(GstCmmlParserClipCallback) gst_cmml_enc_parse_tag_clip;
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enc->parser->cmml_end_callback =
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(GstCmmlParserCmmlEndCallback) gst_cmml_enc_parse_end_tag;
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enc->tracks = gst_cmml_track_list_new ();
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enc->sent_headers = FALSE;
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enc->sent_eos = FALSE;
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enc->flow_return = GST_FLOW_OK;
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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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{
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gst_cmml_track_list_destroy (enc->tracks);
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enc->tracks = NULL;
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g_free (enc->preamble);
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enc->preamble = NULL;
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gst_cmml_parser_free (enc->parser);
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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_enc_sink_event (GstPad * pad, GstEvent * event)
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{
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GstCmmlEnc *enc = GST_CMML_ENC (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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if (!enc->sent_eos)
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gst_cmml_enc_parse_end_tag (enc);
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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_enc_new_buffer (GstCmmlEnc * enc,
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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 (enc->srcpad, GST_BUFFER_OFFSET_NONE, size,
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NULL, 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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} else {
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GST_WARNING_OBJECT (enc, "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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static GstCaps *
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gst_cmml_enc_set_header_on_caps (GstCmmlEnc * enc, GstCaps * caps,
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GstBuffer * ident, GstBuffer * preamble, GstBuffer * head)
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{
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GValue array = { 0 };
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GValue value = { 0 };
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GstStructure *structure;
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GstBuffer *buffer;
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caps = gst_caps_make_writable (caps);
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structure = gst_caps_get_structure (caps, 0);
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g_value_init (&array, GST_TYPE_ARRAY);
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g_value_init (&value, GST_TYPE_BUFFER);
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/* Make copies of header buffers to avoid circular references */
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buffer = gst_buffer_copy (ident);
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gst_value_set_buffer (&value, buffer);
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gst_value_array_append_value (&array, &value);
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gst_buffer_unref (buffer);
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buffer = gst_buffer_copy (preamble);
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gst_value_set_buffer (&value, buffer);
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gst_value_array_append_value (&array, &value);
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gst_buffer_unref (buffer);
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buffer = gst_buffer_copy (head);
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gst_value_set_buffer (&value, buffer);
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gst_value_array_append_value (&array, &value);
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gst_buffer_unref (buffer);
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GST_BUFFER_FLAG_SET (ident, GST_BUFFER_FLAG_IN_CAPS);
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GST_BUFFER_FLAG_SET (preamble, GST_BUFFER_FLAG_IN_CAPS);
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GST_BUFFER_FLAG_SET (head, GST_BUFFER_FLAG_IN_CAPS);
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gst_structure_set_value (structure, "streamheader", &array);
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g_value_unset (&value);
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g_value_unset (&array);
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return caps;
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}
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/* create a CMML ident header buffer
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*/
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static GstFlowReturn
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gst_cmml_enc_new_ident_header (GstCmmlEnc * enc, GstBuffer ** buffer)
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{
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guint8 ident_header[CMML_IDENT_HEADER_SIZE];
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guint8 *wptr = ident_header;
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memcpy (wptr, "CMML\0\0\0\0", 8);
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wptr += 8;
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GST_WRITE_UINT16_LE (wptr, enc->major);
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wptr += 2;
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GST_WRITE_UINT16_LE (wptr, enc->minor);
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wptr += 2;
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GST_WRITE_UINT64_LE (wptr, enc->granulerate_n);
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wptr += 8;
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GST_WRITE_UINT64_LE (wptr, enc->granulerate_d);
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wptr += 8;
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*wptr = enc->granuleshift;
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return gst_cmml_enc_new_buffer (enc,
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(guchar *) & ident_header, CMML_IDENT_HEADER_SIZE, buffer);
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}
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/* parse the CMML preamble */
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static void
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gst_cmml_enc_parse_preamble (GstCmmlEnc * enc,
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guchar * preamble, guchar * processing_instruction)
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{
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GST_INFO_OBJECT (enc, "parsing preamble");
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/* save the preamble: it will be pushed when the head tag is found */
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enc->preamble = (guchar *) g_strconcat ((gchar *) preamble,
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(gchar *) processing_instruction, NULL);
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}
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/* parse the CMML end tag */
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static void
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gst_cmml_enc_parse_end_tag (GstCmmlEnc * enc)
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{
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GstBuffer *buffer;
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GST_INFO_OBJECT (enc, "parsing end tag");
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/* push an empty buffer to signal EOS */
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enc->flow_return = gst_cmml_enc_new_buffer (enc, NULL, 0, &buffer);
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if (enc->flow_return == GST_FLOW_OK) {
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/* set granulepos 0 on EOS */
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GST_BUFFER_OFFSET_END (buffer) = 0;
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enc->flow_return = gst_cmml_enc_push (enc, buffer);
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enc->sent_eos = TRUE;
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}
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return;
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}
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/* encode the CMML head tag and push the CMML headers
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*/
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static void
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gst_cmml_enc_parse_tag_head (GstCmmlEnc * enc, GstCmmlTagHead * head)
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{
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GList *headers = NULL;
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GList *walk;
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guchar *head_string;
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GstCaps *caps;
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GstBuffer *ident_buf, *preamble_buf, *head_buf;
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GstBuffer *buffer;
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if (enc->preamble == NULL)
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goto flow_unexpected;
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GST_INFO_OBJECT (enc, "parsing head tag");
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enc->flow_return = gst_cmml_enc_new_ident_header (enc, &ident_buf);
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if (enc->flow_return != GST_FLOW_OK)
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goto alloc_error;
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headers = g_list_append (headers, ident_buf);
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enc->flow_return = gst_cmml_enc_new_buffer (enc,
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enc->preamble, strlen ((gchar *) enc->preamble), &preamble_buf);
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if (enc->flow_return != GST_FLOW_OK)
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goto alloc_error;
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headers = g_list_append (headers, preamble_buf);
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head_string = gst_cmml_parser_tag_head_to_string (enc->parser, head);
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enc->flow_return = gst_cmml_enc_new_buffer (enc,
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head_string, strlen ((gchar *) head_string), &head_buf);
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g_free (head_string);
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if (enc->flow_return != GST_FLOW_OK)
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goto alloc_error;
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headers = g_list_append (headers, head_buf);
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caps = gst_pad_get_caps (enc->srcpad);
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caps = gst_cmml_enc_set_header_on_caps (enc, caps,
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ident_buf, preamble_buf, head_buf);
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while (headers) {
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buffer = GST_BUFFER (headers->data);
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/* set granulepos 0 on headers */
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GST_BUFFER_OFFSET_END (buffer) = 0;
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gst_buffer_set_caps (buffer, caps);
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enc->flow_return = gst_cmml_enc_push (enc, buffer);
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headers = g_list_delete_link (headers, headers);
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if (GST_FLOW_IS_FATAL (enc->flow_return))
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goto push_error;
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}
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gst_caps_unref (caps);
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enc->sent_headers = TRUE;
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return;
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flow_unexpected:
|
|
GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
|
|
(NULL), ("got head tag before preamble"));
|
|
enc->flow_return = GST_FLOW_ERROR;
|
|
return;
|
|
push_error:
|
|
gst_caps_unref (caps);
|
|
/* fallthrough */
|
|
alloc_error:
|
|
for (walk = headers; walk; walk = walk->next)
|
|
gst_buffer_unref (GST_BUFFER (walk->data));
|
|
g_list_free (headers);
|
|
return;
|
|
}
|
|
|
|
/* encode a CMML clip tag
|
|
* remove the start and end attributes (GstCmmlParser does this itself) and
|
|
* push the tag with the timestamp of its start attribute. If the tag has the
|
|
* end attribute, create a new empty clip and encode it.
|
|
*/
|
|
static void
|
|
gst_cmml_enc_parse_tag_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip)
|
|
{
|
|
GstCmmlTagClip *prev_clip;
|
|
GstClockTime prev_clip_time = GST_CLOCK_TIME_NONE;
|
|
|
|
/* this can happen if there's a programming error (eg user forgets to set
|
|
* the start-time property) or if one of the gst_cmml_clock_time_from_*
|
|
* overflows in GstCmmlParser */
|
|
if (clip->start_time == GST_CLOCK_TIME_NONE) {
|
|
GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
|
|
(NULL), ("invalid start time for clip (%s)", clip->id));
|
|
enc->flow_return = GST_FLOW_ERROR;
|
|
|
|
return;
|
|
}
|
|
|
|
/* get the previous clip's start time to encode the current granulepos */
|
|
prev_clip = gst_cmml_track_list_get_track_last_clip (enc->tracks,
|
|
(gchar *) clip->track);
|
|
if (prev_clip) {
|
|
prev_clip_time = prev_clip->start_time;
|
|
if (prev_clip_time > clip->start_time) {
|
|
GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
|
|
(NULL), ("previous clip start time > current clip (%s) start time",
|
|
clip->id));
|
|
enc->flow_return = GST_FLOW_ERROR;
|
|
return;
|
|
}
|
|
|
|
/* we don't need the prev clip anymore */
|
|
gst_cmml_track_list_del_clip (enc->tracks, prev_clip);
|
|
}
|
|
|
|
/* add the current clip to the tracklist */
|
|
gst_cmml_track_list_add_clip (enc->tracks, clip);
|
|
|
|
enc->flow_return = gst_cmml_enc_push_clip (enc, clip, prev_clip_time);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_cmml_enc_push_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip,
|
|
GstClockTime prev_clip_time)
|
|
{
|
|
GstFlowReturn res;
|
|
GstBuffer *buffer;
|
|
gchar *clip_string;
|
|
gint64 granulepos;
|
|
|
|
/* encode the clip */
|
|
clip_string =
|
|
(gchar *) gst_cmml_parser_tag_clip_to_string (enc->parser, clip);
|
|
|
|
res = gst_cmml_enc_new_buffer (enc,
|
|
(guchar *) clip_string, strlen (clip_string), &buffer);
|
|
g_free (clip_string);
|
|
if (res != GST_FLOW_OK)
|
|
goto done;
|
|
|
|
GST_INFO_OBJECT (enc, "encoding clip"
|
|
"(start-time: %" GST_TIME_FORMAT " end-time: %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (clip->start_time), GST_TIME_ARGS (clip->end_time));
|
|
|
|
/* set the granulepos */
|
|
granulepos = gst_cmml_clock_time_to_granule (prev_clip_time, clip->start_time,
|
|
enc->granulerate_n, enc->granulerate_d, enc->granuleshift);
|
|
if (granulepos == -1) {
|
|
gst_buffer_unref (buffer);
|
|
goto granule_overflow;
|
|
}
|
|
|
|
GST_BUFFER_OFFSET (buffer) = clip->start_time;
|
|
GST_BUFFER_OFFSET_END (buffer) = granulepos;
|
|
GST_BUFFER_TIMESTAMP (buffer) = clip->start_time;
|
|
|
|
res = gst_cmml_enc_push (enc, buffer);
|
|
if (GST_FLOW_IS_FATAL (res))
|
|
goto done;
|
|
|
|
if (clip->end_time != GST_CLOCK_TIME_NONE) {
|
|
/* create a new empty clip for the same cmml track starting at end_time
|
|
*/
|
|
GObject *end_clip = g_object_new (GST_TYPE_CMML_TAG_CLIP,
|
|
"start-time", clip->end_time, "track", clip->track, NULL);
|
|
|
|
/* encode the empty end clip */
|
|
gst_cmml_enc_push_clip (enc, GST_CMML_TAG_CLIP (end_clip),
|
|
clip->start_time);
|
|
g_object_unref (end_clip);
|
|
}
|
|
done:
|
|
return res;
|
|
|
|
granule_overflow:
|
|
GST_ELEMENT_ERROR (enc, STREAM, ENCODE, (NULL), ("granulepos overflow"));
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_cmml_enc_push (GstCmmlEnc * enc, GstBuffer * buffer)
|
|
{
|
|
GstFlowReturn res;
|
|
|
|
res = gst_pad_push (enc->srcpad, buffer);
|
|
if (GST_FLOW_IS_FATAL (res))
|
|
GST_WARNING_OBJECT (enc, "push returned: %s", gst_flow_get_name (res));
|
|
|
|
return res;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_cmml_enc_chain (GstPad * pad, GstBuffer * buffer)
|
|
{
|
|
GError *err = NULL;
|
|
GstCmmlEnc *enc = GST_CMML_ENC (GST_PAD_PARENT (pad));
|
|
|
|
/* the CMML handlers registered with enc->parser will override this when
|
|
* encoding/pushing the buffers downstream
|
|
*/
|
|
enc->flow_return = GST_FLOW_OK;
|
|
|
|
if (!gst_cmml_parser_parse_chunk (enc->parser,
|
|
(gchar *) GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer), &err)) {
|
|
GST_ELEMENT_ERROR (enc, STREAM, ENCODE, (NULL), ("%s", err->message));
|
|
g_error_free (err);
|
|
enc->flow_return = GST_FLOW_ERROR;
|
|
}
|
|
|
|
gst_buffer_unref (buffer);
|
|
return enc->flow_return;
|
|
}
|
|
|
|
gboolean
|
|
gst_cmml_enc_plugin_init (GstPlugin * plugin)
|
|
{
|
|
if (!gst_element_register (plugin, "cmmlenc", GST_RANK_NONE,
|
|
GST_TYPE_CMML_ENC))
|
|
return FALSE;
|
|
|
|
GST_DEBUG_CATEGORY_INIT (cmmlenc, "cmmlenc", 0,
|
|
"annodex cmml decoding element");
|
|
|
|
return TRUE;
|
|
}
|