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139 lines
4.4 KiB
C
139 lines
4.4 KiB
C
/*
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* Copyright (C) 2006 James Livingston <doclivingston@gmail.com>
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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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/**
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* SECTION:element-vorbistag
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* @title: vorbistag
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* @see_also: #oggdemux, #oggmux, #vorbisparse, #GstTagSetter
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*
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* The vorbistags element can change the tag contained within a raw
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* vorbis stream. Specifically, it modifies the comments header packet
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* of the vorbis stream.
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*
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* The element will also process the stream as the #vorbisparse element does
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* so it can be used when remuxing an Ogg Vorbis stream, without additional
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* elements.
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*
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* Applications can set the tags to write using the #GstTagSetter interface.
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* Tags contained within the vorbis bitstream will be picked up
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* automatically (and merged according to the merge mode set via the tag
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* setter interface).
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*
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* ## Example pipelines
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* |[
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* gst-launch-1.0 -v filesrc location=foo.ogg ! oggdemux ! vorbistag ! oggmux ! filesink location=bar.ogg
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* ]|
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* This element is not useful with gst-launch-1.0, because it does not support
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* setting the tags on a #GstTagSetter interface. Conceptually, the element
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* will usually be used in this order though.
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*
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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 <glib.h>
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#include <gst/tag/tag.h>
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#include <gst/gsttagsetter.h>
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#include <vorbis/codec.h>
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#include "gstvorbiselements.h"
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#include "gstvorbistag.h"
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GST_DEBUG_CATEGORY_STATIC (vorbistag_debug);
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#define GST_CAT_DEFAULT vorbistag_debug
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static GstFlowReturn gst_vorbis_tag_parse_packet (GstVorbisParse * parse,
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GstBuffer * buffer);
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#define gst_vorbis_tag_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstVorbisTag, gst_vorbis_tag,
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GST_TYPE_VORBIS_PARSE, G_IMPLEMENT_INTERFACE (GST_TYPE_TAG_SETTER, NULL));
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (vorbistag, "vorbistag",
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GST_RANK_NONE, GST_TYPE_VORBIS_TAG,
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GST_DEBUG_CATEGORY_INIT (vorbistag_debug, "vorbistag", 0,
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"vorbis tagging element"); vorbis_element_init (plugin));
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static void
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gst_vorbis_tag_class_init (GstVorbisTagClass * klass)
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{
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GstVorbisParseClass *vorbisparse_class = GST_VORBIS_PARSE_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_set_static_metadata (element_class,
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"VorbisTag", "Formatter/Metadata",
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"Retags vorbis streams", "James Livingston <doclivingston@gmail.com>");
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vorbisparse_class->parse_packet = gst_vorbis_tag_parse_packet;
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}
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static void
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gst_vorbis_tag_init (GstVorbisTag * tagger)
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{
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/* nothing to do */
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}
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static GstFlowReturn
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gst_vorbis_tag_parse_packet (GstVorbisParse * parse, GstBuffer * buffer)
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{
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GstTagList *old_tags, *new_tags;
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const GstTagList *user_tags;
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GstVorbisTag *tagger;
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gchar *encoder = NULL;
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GstBuffer *new_buf;
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GstMapInfo map;
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gboolean do_parse = FALSE;
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gst_buffer_map (buffer, &map, GST_MAP_READ);
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/* just pass everything except the comments packet */
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if (map.size >= 1 && map.data[0] != 0x03)
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do_parse = TRUE;
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gst_buffer_unmap (buffer, &map);
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if (do_parse) {
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return GST_VORBIS_PARSE_CLASS (parent_class)->parse_packet (parse, buffer);
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}
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tagger = GST_VORBIS_TAG (parse);
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old_tags =
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gst_tag_list_from_vorbiscomment_buffer (buffer, (guint8 *) "\003vorbis",
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7, &encoder);
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user_tags = gst_tag_setter_get_tag_list (GST_TAG_SETTER (tagger));
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/* build new tag list */
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new_tags = gst_tag_list_merge (user_tags, old_tags,
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gst_tag_setter_get_tag_merge_mode (GST_TAG_SETTER (tagger)));
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gst_tag_list_unref (old_tags);
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new_buf =
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gst_tag_list_to_vorbiscomment_buffer (new_tags, (guint8 *) "\003vorbis",
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7, encoder);
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gst_buffer_copy_into (new_buf, buffer, GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
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gst_tag_list_unref (new_tags);
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g_free (encoder);
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gst_buffer_unref (buffer);
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return GST_VORBIS_PARSE_CLASS (parent_class)->parse_packet (parse, new_buf);
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}
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