1 /* -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
2 /* GStreamer ID3 tag demuxer
3 * Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
4 * Copyright (C) 2003-2004 Benjamin Otte <otte@gnome.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 * SECTION:element-id3demux
25 * id3demux accepts data streams with either (or both) ID3v2 regions at the
26 * start, or ID3v1 at the end. The mime type of the data between the tag blocks
27 * is detected using typefind functions, and the appropriate output mime type
28 * set on outgoing buffers.
30 * The element is only able to read ID3v1 tags from a seekable stream, because
31 * they are at the end of the stream. That is, when get_range mode is supported
32 * by the upstream elements. If get_range operation is available, id3demux makes
33 * it available downstream. This means that elements which require get_range
34 * mode, such as wavparse, can operate on files containing ID3 tag information.
36 * This id3demux element replaced an older element with the same name which
37 * relied on libid3tag from the MAD project.
40 * <title>Example launch line</title>
42 * gst-launch filesrc location=file.mp3 ! id3demux ! fakesink -t
43 * ]| This pipeline should read any available ID3 tag information and output it.
44 * The contents of the file inside the ID3 tag regions should be detected, and
45 * the appropriate mime type set on buffers produced from id3demux.
52 #include <gst/gst-i18n-plugin.h>
53 #include <gst/tag/tag.h>
54 #include <gst/pbutils/pbutils.h>
57 #include "gstid3demux.h"
66 #define DEFAULT_PREFER_V1 FALSE
68 GST_DEBUG_CATEGORY (id3demux_debug);
69 #define GST_CAT_DEFAULT (id3demux_debug)
71 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
74 GST_STATIC_CAPS ("application/x-id3")
77 static gboolean gst_id3demux_identify_tag (GstTagDemux * demux,
78 GstBuffer * buffer, gboolean start_tag, guint * tag_size);
79 static GstTagDemuxResult gst_id3demux_parse_tag (GstTagDemux * demux,
80 GstBuffer * buffer, gboolean start_tag, guint * tag_size,
82 static GstTagList *gst_id3demux_merge_tags (GstTagDemux * tagdemux,
83 const GstTagList * start_tags, const GstTagList * end_tags);
85 static void gst_id3demux_set_property (GObject * object, guint prop_id,
86 const GValue * value, GParamSpec * pspec);
87 static void gst_id3demux_get_property (GObject * object, guint prop_id,
88 GValue * value, GParamSpec * pspec);
90 GST_BOILERPLATE (GstID3Demux, gst_id3demux, GstTagDemux, GST_TYPE_TAG_DEMUX);
93 gst_id3demux_base_init (gpointer klass)
95 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
97 gst_element_class_add_pad_template (element_class,
98 gst_static_pad_template_get (&sink_factory));
100 gst_element_class_set_details_simple (element_class, "ID3 tag demuxer",
101 "Codec/Demuxer/Metadata",
102 "Read and output ID3v1 and ID3v2 tags while demuxing the contents",
103 "Jan Schmidt <thaytan@mad.scientist.com>");
107 gst_id3demux_class_init (GstID3DemuxClass * klass)
109 GstTagDemuxClass *tagdemux_class = (GstTagDemuxClass *) klass;
110 GObjectClass *gobject_class = (GObjectClass *) klass;
112 gobject_class->set_property = gst_id3demux_set_property;
113 gobject_class->get_property = gst_id3demux_get_property;
115 g_object_class_install_property (gobject_class, ARG_PREFER_V1,
116 g_param_spec_boolean ("prefer-v1", "Prefer version 1 tag",
117 "Prefer tags from ID3v1 tag at end of file when both ID3v1 "
118 "and ID3v2 tags are present", DEFAULT_PREFER_V1,
119 G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
121 tagdemux_class->identify_tag = GST_DEBUG_FUNCPTR (gst_id3demux_identify_tag);
122 tagdemux_class->parse_tag = GST_DEBUG_FUNCPTR (gst_id3demux_parse_tag);
123 tagdemux_class->merge_tags = GST_DEBUG_FUNCPTR (gst_id3demux_merge_tags);
125 tagdemux_class->min_start_size = ID3V2_HDR_SIZE;
126 tagdemux_class->min_end_size = ID3V1_TAG_SIZE;
130 gst_id3demux_init (GstID3Demux * id3demux, GstID3DemuxClass * klass)
132 id3demux->prefer_v1 = DEFAULT_PREFER_V1;
136 gst_id3demux_identify_tag (GstTagDemux * demux, GstBuffer * buf,
137 gboolean start_tag, guint * tag_size)
139 const guint8 *data = GST_BUFFER_DATA (buf);
142 if (data[0] != 'I' || data[1] != 'D' || data[2] != '3')
145 *tag_size = id3demux_calc_id3v2_tag_size (buf);
147 if (data[0] != 'T' || data[1] != 'A' || data[2] != 'G')
150 *tag_size = ID3V1_TAG_SIZE;
153 GST_INFO_OBJECT (demux, "Found ID3v%u marker, tag_size = %u",
154 (start_tag) ? 2 : 1, *tag_size);
160 GST_DEBUG_OBJECT (demux, "No ID3v%u marker found", (start_tag) ? 2 : 1);
166 gst_id3demux_add_container_format (GstTagList * tags)
170 sink_caps = gst_static_pad_template_get_caps (&sink_factory);
171 gst_pb_utils_add_codec_description_to_tag_list (tags,
172 GST_TAG_CONTAINER_FORMAT, sink_caps);
173 gst_caps_unref (sink_caps);
176 static GstTagDemuxResult
177 gst_id3demux_parse_tag (GstTagDemux * demux, GstBuffer * buffer,
178 gboolean start_tag, guint * tag_size, GstTagList ** tags)
181 ID3TagsResult res; /* FIXME: make id3tags.c return tagmuxresult values */
183 res = id3demux_read_id3v2_tag (buffer, tag_size, tags);
185 if (G_LIKELY (res == ID3TAGS_READ_TAG)) {
186 gst_id3demux_add_container_format (*tags);
187 return GST_TAG_DEMUX_RESULT_OK;
189 return GST_TAG_DEMUX_RESULT_BROKEN_TAG;
192 *tags = gst_tag_list_new_from_id3v1 (GST_BUFFER_DATA (buffer));
194 if (G_UNLIKELY (*tags == NULL))
195 return GST_TAG_DEMUX_RESULT_BROKEN_TAG;
197 gst_id3demux_add_container_format (*tags);
198 *tag_size = ID3V1_TAG_SIZE;
199 return GST_TAG_DEMUX_RESULT_OK;
204 gst_id3demux_merge_tags (GstTagDemux * tagdemux, const GstTagList * start_tags,
205 const GstTagList * end_tags)
207 GstID3Demux *id3demux;
211 id3demux = GST_ID3DEMUX (tagdemux);
213 GST_OBJECT_LOCK (id3demux);
214 prefer_v1 = id3demux->prefer_v1;
215 GST_OBJECT_UNLOCK (id3demux);
217 /* we merge in REPLACE mode, so put the less important tags first */
219 merged = gst_tag_list_merge (start_tags, end_tags, GST_TAG_MERGE_REPLACE);
221 merged = gst_tag_list_merge (end_tags, start_tags, GST_TAG_MERGE_REPLACE);
223 GST_LOG_OBJECT (id3demux, "start tags: %" GST_PTR_FORMAT, start_tags);
224 GST_LOG_OBJECT (id3demux, "end tags: %" GST_PTR_FORMAT, end_tags);
225 GST_LOG_OBJECT (id3demux, "merged tags: %" GST_PTR_FORMAT, merged);
231 gst_id3demux_set_property (GObject * object, guint prop_id,
232 const GValue * value, GParamSpec * pspec)
234 GstID3Demux *id3demux;
236 id3demux = GST_ID3DEMUX (object);
240 GST_OBJECT_LOCK (id3demux);
241 id3demux->prefer_v1 = g_value_get_boolean (value);
242 GST_OBJECT_UNLOCK (id3demux);
246 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
252 gst_id3demux_get_property (GObject * object, guint prop_id,
253 GValue * value, GParamSpec * pspec)
255 GstID3Demux *id3demux;
257 id3demux = GST_ID3DEMUX (object);
261 GST_OBJECT_LOCK (id3demux);
262 g_value_set_boolean (value, id3demux->prefer_v1);
263 GST_OBJECT_UNLOCK (id3demux);
266 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
272 plugin_init (GstPlugin * plugin)
274 GST_DEBUG_CATEGORY_INIT (id3demux_debug, "id3demux", 0,
275 "GStreamer ID3 tag demuxer");
277 gst_tag_register_musicbrainz_tags ();
279 /* ensure private tag is registered */
280 gst_tag_register (GST_ID3_DEMUX_TAG_ID3V2_FRAME, GST_TAG_FLAG_META,
281 GST_TYPE_BUFFER, "ID3v2 frame", "unparsed id3v2 tag frame",
282 gst_tag_merge_use_first);
284 return gst_element_register (plugin, "id3demux",
285 GST_RANK_PRIMARY, GST_TYPE_ID3DEMUX);
288 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
291 "Demux ID3v1 and ID3v2 tags from a file",
292 plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)