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151 lines
5.1 KiB
C
151 lines
5.1 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., 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-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 withing 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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* <refsect2>
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* <title>Example pipelines</title>
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* |[
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* gst-launch -v filesrc location=foo.ogg ! oggdemux ! vorbistag ! oggmux ! filesink location=bar.ogg
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* ]| This element is not useful with gst-launch, 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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* </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 <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 "gstvorbistag.h"
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GST_DEBUG_CATEGORY_EXTERN (vorbisparse_debug);
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#define GST_CAT_DEFAULT vorbisparse_debug
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static void gst_vorbis_tag_base_init (gpointer g_class);
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static void gst_vorbis_tag_class_init (GstVorbisTagClass * klass);
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static void gst_vorbis_tag_init (GstVorbisTag * tagger,
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GstVorbisTagClass * g_class);
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static GstFlowReturn gst_vorbis_tag_parse_packet (GstVorbisParse * parse,
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GstBuffer * buffer);
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#define _do_init(type) \
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G_STMT_START{ \
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static const GInterfaceInfo tag_setter_info = { \
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NULL, \
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NULL, \
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NULL \
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}; \
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g_type_add_interface_static (type, GST_TYPE_TAG_SETTER, \
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&tag_setter_info); \
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}G_STMT_END
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GST_BOILERPLATE_FULL (GstVorbisTag, gst_vorbis_tag, GstVorbisParse,
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GST_TYPE_VORBIS_PARSE, _do_init);
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static GstElementDetails vorbis_tag_details = {
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"VorbisTag",
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"Formatter/Metadata",
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"Retags vorbis streams",
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"James Livingston <doclivingston@gmail.com>"
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};
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static void
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gst_vorbis_tag_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_set_details (element_class, &vorbis_tag_details);
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}
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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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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, GstVorbisTagClass * g_class)
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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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/* just pass everything except the comments packet */
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if (GST_BUFFER_SIZE (buffer) >= 1 && GST_BUFFER_DATA (buffer)[0] != 0x03) {
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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_free (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_metadata (new_buf, buffer, GST_BUFFER_COPY_TIMESTAMPS);
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gst_tag_list_free (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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