2 * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
4 * gstvorbistag.c: library for reading / modifying vorbis tags
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:gsttagvorbis
24 * @short_description: tag mappings and support functions for plugins
25 * dealing with vorbiscomments
26 * @see_also: #GstTagList
30 * Contains various utility functions for plugins to parse or create
31 * vorbiscomments and map them to and from #GstTagList<!-- -->s.
39 #include <gst/gsttagsetter.h>
40 #include <gst/base/gstbytereader.h>
41 #include <gst/base/gstbytewriter.h>
42 #include "gsttageditingprivate.h"
47 * see http://xiph.org/ogg/vorbis/doc/v-comment.html
49 static const GstTagEntryMatch tag_matches[] = {
50 {GST_TAG_TITLE, "TITLE"},
51 {GST_TAG_VERSION, "VERSION"},
52 {GST_TAG_ALBUM, "ALBUM"},
53 {GST_TAG_TRACK_NUMBER, "TRACKNUMBER"},
54 {GST_TAG_ALBUM_VOLUME_NUMBER, "DISCNUMBER"},
55 {GST_TAG_TRACK_COUNT, "TRACKTOTAL"},
56 {GST_TAG_ALBUM_VOLUME_COUNT, "DISCTOTAL"},
57 {GST_TAG_ARTIST, "ARTIST"},
58 {GST_TAG_PERFORMER, "PERFORMER"},
59 {GST_TAG_COMPOSER, "COMPOSER"},
60 {GST_TAG_COPYRIGHT, "COPYRIGHT"},
61 {GST_TAG_LICENSE, "LICENSE"},
62 {GST_TAG_LICENSE_URI, "LICENSE"},
63 {GST_TAG_GEO_LOCATION_NAME, "LOCATION"},
64 {GST_TAG_ORGANIZATION, "ORGANIZATION"},
65 {GST_TAG_DESCRIPTION, "DESCRIPTION"},
66 {GST_TAG_GENRE, "GENRE"},
67 {GST_TAG_DATE, "DATE"},
68 {GST_TAG_CONTACT, "CONTACT"},
69 {GST_TAG_ISRC, "ISRC"},
70 {GST_TAG_COMMENT, "COMMENT"},
71 {GST_TAG_TRACK_GAIN, "REPLAYGAIN_TRACK_GAIN"},
72 {GST_TAG_TRACK_PEAK, "REPLAYGAIN_TRACK_PEAK"},
73 {GST_TAG_ALBUM_GAIN, "REPLAYGAIN_ALBUM_GAIN"},
74 {GST_TAG_ALBUM_PEAK, "REPLAYGAIN_ALBUM_PEAK"},
75 {GST_TAG_REFERENCE_LEVEL, "REPLAYGAIN_REFERENCE_LOUDNESS"},
76 {GST_TAG_MUSICBRAINZ_TRACKID, "MUSICBRAINZ_TRACKID"},
77 {GST_TAG_MUSICBRAINZ_ARTISTID, "MUSICBRAINZ_ARTISTID"},
78 {GST_TAG_MUSICBRAINZ_ALBUMID, "MUSICBRAINZ_ALBUMID"},
79 {GST_TAG_MUSICBRAINZ_ALBUMARTISTID, "MUSICBRAINZ_ALBUMARTISTID"},
80 {GST_TAG_MUSICBRAINZ_TRMID, "MUSICBRAINZ_TRMID"},
81 {GST_TAG_ARTIST_SORTNAME, "ARTISTSORT"},
82 {GST_TAG_ARTIST_SORTNAME, "ARTISTSORTORDER"},
83 {GST_TAG_ARTIST_SORTNAME, "MUSICBRAINZ_SORTNAME"},
84 {GST_TAG_ALBUM_SORTNAME, "ALBUMSORT"},
85 {GST_TAG_ALBUM_SORTNAME, "ALBUMSORTORDER"},
86 {GST_TAG_TITLE_SORTNAME, "TITLESORT"},
87 {GST_TAG_TITLE_SORTNAME, "TITLESORTORDER"},
88 {GST_TAG_ALBUM_ARTIST, "ALBUMARTIST"},
89 {GST_TAG_ALBUM_ARTIST_SORTNAME, "ALBUMARTISTSORT"},
90 {GST_TAG_ALBUM_ARTIST_SORTNAME, "ALBUMARTISTSORTORDER"},
91 {GST_TAG_LANGUAGE_CODE, "LANGUAGE"},
92 {GST_TAG_CDDA_MUSICBRAINZ_DISCID, "MUSICBRAINZ_DISCID"},
93 {GST_TAG_CDDA_CDDB_DISCID, "DISCID"},
94 /* For the apparent de-facto standard for coverart in vorbis comments, see:
95 * http://www.hydrogenaudio.org/forums/lofiversion/index.php/t48386.html */
96 {GST_TAG_PREVIEW_IMAGE, "COVERART"},
97 /* some evidence that "BPM" is used elsewhere:
98 * http://mail.kde.org/pipermail/amarok/2006-May/000090.html
100 {GST_TAG_BEATS_PER_MINUTE, "BPM"},
101 /* What GStreamer calls encoder ("encoder used to encode this stream") is
102 stored in the vendor string in Vorbis/Theora/Kate and possibly others.
103 The Vorbis comment packet used in those streams uses ENCODER as the name
104 of the encoding program, which GStreamer calls application-name. */
105 {GST_TAG_APPLICATION_NAME, "ENCODER"},
110 * gst_tag_from_vorbis_tag:
111 * @vorbis_tag: vorbiscomment tag to convert to GStreamer tag
113 * Looks up the GStreamer tag for a vorbiscomment tag.
115 * Returns: The corresponding GStreamer tag or NULL if none exists.
118 gst_tag_from_vorbis_tag (const gchar * vorbis_tag)
121 gchar *real_vorbis_tag;
123 g_return_val_if_fail (vorbis_tag != NULL, NULL);
125 gst_tag_register_musicbrainz_tags ();
127 real_vorbis_tag = g_ascii_strup (vorbis_tag, -1);
128 while (tag_matches[i].gstreamer_tag != NULL) {
129 if (strcmp (real_vorbis_tag, tag_matches[i].original_tag) == 0) {
134 g_free (real_vorbis_tag);
135 return tag_matches[i].gstreamer_tag;
139 * gst_tag_to_vorbis_tag:
140 * @gst_tag: GStreamer tag to convert to vorbiscomment tag
142 * Looks up the vorbiscomment tag for a GStreamer tag.
144 * Returns: The corresponding vorbiscomment tag or NULL if none exists.
147 gst_tag_to_vorbis_tag (const gchar * gst_tag)
151 g_return_val_if_fail (gst_tag != NULL, NULL);
153 gst_tag_register_musicbrainz_tags ();
155 while (tag_matches[i].gstreamer_tag != NULL) {
156 if (strcmp (gst_tag, tag_matches[i].gstreamer_tag) == 0) {
157 return tag_matches[i].original_tag;
166 * gst_vorbis_tag_add:
167 * @list: a #GstTagList
168 * @tag: a vorbiscomment tag string (key in key=value), must be valid UTF-8
169 * @value: a vorbiscomment value string (value in key=value), must be valid UTF-8
171 * Convenience function using gst_tag_from_vorbis_tag(), parsing
172 * a vorbis comment string into the right type and adding it to the
173 * given taglist @list.
175 * Unknown vorbiscomment tags will be added to the tag list in form
176 * of a #GST_TAG_EXTENDED_COMMENT (since 0.10.10 at least).
179 gst_vorbis_tag_add (GstTagList * list, const gchar * tag, const gchar * value)
181 const gchar *gst_tag;
184 g_return_if_fail (list != NULL);
185 g_return_if_fail (tag != NULL);
186 g_return_if_fail (value != NULL);
188 g_return_if_fail (g_utf8_validate (tag, -1, NULL));
189 g_return_if_fail (g_utf8_validate (value, -1, NULL));
190 g_return_if_fail (strchr (tag, '=') == NULL);
192 gst_tag = gst_tag_from_vorbis_tag (tag);
193 if (gst_tag == NULL) {
196 ext_comment = g_strdup_printf ("%s=%s", tag, value);
197 gst_tag_list_add (list, GST_TAG_MERGE_APPEND, GST_TAG_EXTENDED_COMMENT,
199 g_free (ext_comment);
203 tag_type = gst_tag_get_type (gst_tag);
208 gboolean is_track_number_tag;
209 gboolean is_disc_number_tag;
211 is_track_number_tag = (strcmp (gst_tag, GST_TAG_TRACK_NUMBER) == 0);
212 is_disc_number_tag = (strcmp (gst_tag, GST_TAG_ALBUM_VOLUME_NUMBER) == 0);
213 tmp = strtoul (value, &check, 10);
214 if (*check == '/' && (is_track_number_tag || is_disc_number_tag)) {
218 count = strtoul (check, &check, 10);
219 if (*check != '\0' || count == 0)
221 if (is_track_number_tag) {
222 gst_tag_list_add (list, GST_TAG_MERGE_APPEND, GST_TAG_TRACK_COUNT,
225 gst_tag_list_add (list, GST_TAG_MERGE_APPEND,
226 GST_TAG_ALBUM_VOLUME_COUNT, count, NULL);
229 if (*check == '\0') {
230 gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag, tmp, NULL);
237 /* specialcase for language code */
238 if (strcmp (tag, "LANGUAGE") == 0) {
239 const gchar *s = strchr (value, '[');
241 /* Accept both ISO-639-1 and ISO-639-2 codes */
242 if (s && strchr (s, ']') == s + 4) {
243 valid = g_strndup (s + 1, 3);
244 } else if (s && strchr (s, ']') == s + 3) {
245 valid = g_strndup (s + 1, 2);
246 } else if (strlen (value) != 2 && strlen (value) != 3) {
247 GST_WARNING ("doesn't contain an ISO-639 language code: %s", value);
249 } else if (strcmp (tag, "LICENSE") == 0) {
250 /* license tags in vorbis comments must contain an URI representing
251 * the license and nothing more, at least according to:
252 * http://wiki.xiph.org/index.php/LICENSE_and_COPYRIGHT_tags_on_Vorbis_Comments */
253 if (value && gst_uri_is_valid (value))
254 gst_tag = GST_TAG_LICENSE_URI;
258 valid = g_strdup (value);
260 gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag, valid, NULL);
267 c = g_strdup (value);
268 g_strdelimit (c, ",", '.');
269 gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag,
270 g_strtod (c, NULL), NULL);
275 if (tag_type == G_TYPE_DATE) {
276 guint y, d = 1, m = 1;
277 gchar *check = (gchar *) value;
279 y = strtoul (check, &check, 10);
282 m = strtoul (check, &check, 10);
285 d = strtoul (check, &check, 10);
289 /* accept dates like 2007-00-00 and 2007-05-00 */
291 if (m == 0 && d == 0)
293 else if (m != 0 && d == 0)
297 /* date might be followed by a time */
298 if ((*check == '\0' || g_ascii_isspace (*check)) && y != 0 &&
299 g_date_valid_dmy (d, m, y)) {
302 date = g_date_new_dmy (d, m, y);
303 gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag, date, NULL);
306 GST_DEBUG ("skipping invalid date '%s' (%u,%u,%u)", value, y, m, d);
309 GST_WARNING ("Unhandled tag of type '%s' (%d)",
310 g_type_name (tag_type), (gint) tag_type);
318 gst_vorbis_tag_add_coverart (GstTagList * tags, gchar * img_data_base64,
325 goto not_enough_data;
327 /* img_data_base64 points to a temporary copy of the base64 encoded data, so
328 * it's safe to do inpace decoding here
330 g_base64_decode_inplace (img_data_base64, &img_len);
335 gst_tag_image_data_to_image_sample ((const guint8 *) img_data_base64,
336 img_len, GST_TAG_IMAGE_TYPE_NONE);
341 gst_tag_list_add (tags, GST_TAG_MERGE_APPEND,
342 GST_TAG_PREVIEW_IMAGE, img, NULL);
344 gst_sample_unref (img);
350 GST_WARNING ("COVERART tag with too little base64-encoded data");
355 GST_WARNING ("Couldn't decode base64 image data from COVERART tag");
360 GST_WARNING ("Couldn't extract image or image type from COVERART tag");
365 /* Standardized way of adding pictures to vorbiscomments:
366 * http://wiki.xiph.org/VorbisComment#METADATA_BLOCK_PICTURE
369 gst_vorbis_tag_add_metadata_block_picture (GstTagList * tags,
370 gchar * value, gint value_len)
372 GstByteReader reader;
373 guint32 img_len = 0, img_type = 0;
374 guint32 img_mimetype_len = 0, img_description_len = 0;
376 const guint8 *data = NULL;
378 /* img_data_base64 points to a temporary copy of the base64 encoded data, so
379 * it's safe to do inpace decoding here
381 g_base64_decode_inplace (value, &decoded_len);
382 if (decoded_len == 0)
385 gst_byte_reader_init (&reader, (guint8 *) value, decoded_len);
387 if (!gst_byte_reader_get_uint32_be (&reader, &img_type))
390 if (!gst_byte_reader_get_uint32_be (&reader, &img_mimetype_len))
392 if (!gst_byte_reader_skip (&reader, img_mimetype_len))
395 if (!gst_byte_reader_get_uint32_be (&reader, &img_description_len))
397 if (!gst_byte_reader_skip (&reader, img_description_len))
400 /* Skip width, height, color depth and number of colors for
402 if (!gst_byte_reader_skip (&reader, 4 * 4))
405 if (!gst_byte_reader_get_uint32_be (&reader, &img_len))
408 if (!gst_byte_reader_get_data (&reader, img_len, &data))
411 gst_tag_list_add_id3_image (tags, data, img_len, img_type);
417 ("Couldn't extract image or image type from METADATA_BLOCK_PICTURE tag");
420 GST_WARNING ("Failed to decode Base64 data from METADATA_BLOCK_PICTURE tag");
425 * gst_tag_list_from_vorbiscomment:
426 * @data: data to convert
427 * @size: size of @data
428 * @id_data: identification data at start of stream
429 * @id_data_length: length of identification data
430 * @vendor_string: pointer to a string that should take the vendor string
431 * of this vorbis comment or NULL if you don't need it.
433 * Creates a new tag list that contains the information parsed out of a
434 * vorbiscomment packet.
436 * Returns: A new #GstTagList with all tags that could be extracted from the
437 * given vorbiscomment buffer or NULL on error.
440 gst_tag_list_from_vorbiscomment (const guint8 * data, gsize size,
441 const guint8 * id_data, const guint id_data_length, gchar ** vendor_string)
443 #define ADVANCE(x) G_STMT_START{ \
446 if (size < 4) goto error; \
447 cur_size = GST_READ_UINT32_LE (data); \
450 if (cur_size > size) goto error; \
451 cur = (gchar*)data; \
459 g_return_val_if_fail (data != NULL, NULL);
460 g_return_val_if_fail (id_data != NULL || id_data_length == 0, NULL);
462 list = gst_tag_list_new_empty ();
464 if (size < 11 || size <= id_data_length + 4)
467 if (id_data_length > 0 && memcmp (data, id_data, id_data_length) != 0)
470 ADVANCE (id_data_length);
473 *vendor_string = g_strndup (cur, cur_size);
476 iterations = cur_size;
482 cur = g_strndup (cur, cur_size);
483 value = strchr (cur, '=');
490 value_len = strlen (value);
491 if (value_len == 0 || !g_utf8_validate (value, value_len, NULL)) {
495 /* we'll just ignore COVERARTMIME and typefind the image data */
496 if (g_ascii_strcasecmp (cur, "COVERARTMIME") == 0) {
498 } else if (g_ascii_strcasecmp (cur, "COVERART") == 0) {
499 gst_vorbis_tag_add_coverart (list, value, value_len);
500 } else if (g_ascii_strcasecmp (cur, "METADATA_BLOCK_PICTURE") == 0) {
501 gst_vorbis_tag_add_metadata_block_picture (list, value, value_len);
503 gst_vorbis_tag_add (list, cur, value);
511 gst_tag_list_free (list);
517 * gst_tag_list_from_vorbiscomment_buffer:
518 * @buffer: buffer to convert
519 * @id_data: identification data at start of stream
520 * @id_data_length: length of identification data
521 * @vendor_string: pointer to a string that should take the vendor string
522 * of this vorbis comment or NULL if you don't need it.
524 * Creates a new tag list that contains the information parsed out of a
525 * vorbiscomment packet.
527 * Returns: A new #GstTagList with all tags that could be extracted from the
528 * given vorbiscomment buffer or NULL on error.
531 gst_tag_list_from_vorbiscomment_buffer (GstBuffer * buffer,
532 const guint8 * id_data, const guint id_data_length, gchar ** vendor_string)
538 data = gst_buffer_map (buffer, &size, NULL, GST_MAP_READ);
540 gst_tag_list_from_vorbiscomment (data, size, id_data, id_data_length,
542 gst_buffer_unmap (buffer, data, size);
556 gst_tag_to_metadata_block_picture (const gchar * tag,
557 const GValue * image_value)
560 gchar *comment_data, *data_result;
561 const gchar *mime_type;
563 GstStructure *mime_struct;
570 GstByteWriter writer;
571 GstTagImageType image_type = GST_TAG_IMAGE_TYPE_NONE;
572 gint width = 0, height = 0;
573 guint8 *metadata_block;
574 guint metadata_block_len;
577 g_return_val_if_fail (image_value != NULL, NULL);
579 /* FIXME, no more buffer caps */
580 g_assert_not_reached ();
583 buffer = gst_value_get_buffer (image_value);
584 g_return_val_if_fail (gst_caps_is_fixed (buffer->caps), NULL);
585 mime_struct = gst_caps_get_structure (buffer->caps, 0);
587 mime_type = gst_structure_get_name (mime_struct);
588 if (strcmp (mime_type, "text/uri-list") == 0)
590 mime_type_len = strlen (mime_type);
592 gst_structure_get (mime_struct, "image-type", GST_TYPE_TAG_IMAGE_TYPE,
593 &image_type, "width", G_TYPE_INT, &width, "height", G_TYPE_INT, &height,
596 metadata_block_len = 32 + mime_type_len + gst_buffer_get_size (buffer);
597 gst_byte_writer_init_with_size (&writer, metadata_block_len, TRUE);
599 if (image_type == GST_TAG_IMAGE_TYPE_NONE
600 && strcmp (tag, GST_TAG_PREVIEW_IMAGE) == 0) {
601 gst_byte_writer_put_uint32_be_unchecked (&writer, 0x01);
603 /* Convert to ID3v2 APIC image type */
604 if (image_type == GST_TAG_IMAGE_TYPE_NONE)
605 image_type = GST_TAG_IMAGE_TYPE_UNDEFINED;
607 image_type = image_type + 2;
608 gst_byte_writer_put_uint32_be_unchecked (&writer, image_type);
611 gst_byte_writer_put_uint32_be_unchecked (&writer, mime_type_len);
612 gst_byte_writer_put_data_unchecked (&writer, (guint8 *) mime_type,
614 /* description length */
615 gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
616 gst_byte_writer_put_uint32_be_unchecked (&writer, width);
617 gst_byte_writer_put_uint32_be_unchecked (&writer, height);
619 gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
620 /* for indexed formats the number of colors */
621 gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
623 data = gst_buffer_map (buffer, &size, NULL, GST_MAP_READ);
624 gst_byte_writer_put_uint32_be_unchecked (&writer, size);
625 gst_byte_writer_put_data_unchecked (&writer, data, size);
626 gst_buffer_unmap (buffer, data, size);
628 g_assert (gst_byte_writer_get_pos (&writer) == metadata_block_len);
630 metadata_block = gst_byte_writer_reset_and_get_data (&writer);
631 comment_data = g_base64_encode (metadata_block, metadata_block_len);
632 g_free (metadata_block);
633 data_result = g_strdup_printf ("METADATA_BLOCK_PICTURE=%s", comment_data);
634 g_free (comment_data);
636 l = g_list_append (l, data_result);
643 * gst_tag_to_vorbis_comments:
644 * @list: a #GstTagList
645 * @tag: a GStreamer tag identifier, such as #GST_TAG_ARTIST
647 * Creates a new tag list that contains the information parsed out of a
648 * vorbiscomment packet.
650 * Returns: A #GList of newly-allocated key=value strings. Free with
651 * g_list_foreach (list, (GFunc) g_free, NULL) plus g_list_free (list)
654 gst_tag_to_vorbis_comments (const GstTagList * list, const gchar * tag)
656 const gchar *vorbis_tag = NULL;
660 g_return_val_if_fail (list != NULL, NULL);
661 g_return_val_if_fail (tag != NULL, NULL);
663 /* Special case: cover art is split into two tags to store data and
664 * MIME-type. Even if the tag list contains multiple entries, there is
665 * no reasonable way to save more than one.
666 * If both, preview image and image, are present we prefer the
669 if ((strcmp (tag, GST_TAG_PREVIEW_IMAGE) == 0 &&
670 gst_tag_list_get_tag_size (list, GST_TAG_IMAGE) == 0) ||
671 strcmp (tag, GST_TAG_IMAGE) == 0) {
672 return gst_tag_to_metadata_block_picture (tag,
673 gst_tag_list_get_value_index (list, tag, 0));
676 if (strcmp (tag, GST_TAG_EXTENDED_COMMENT) != 0) {
677 vorbis_tag = gst_tag_to_vorbis_tag (tag);
682 /* FIXME: for tags that can map to multiple vorbis comment keys, add all
683 * of the possible keys */
684 for (i = 0; i < gst_tag_list_get_tag_size (list, tag); i++) {
685 GType tag_type = gst_tag_get_type (tag);
686 gchar *result = NULL;
692 if (!gst_tag_list_get_uint_index (list, tag, i, &u))
693 g_return_val_if_reached (NULL);
694 result = g_strdup_printf ("%s=%u", vorbis_tag, u);
698 const gchar *str = NULL;
700 if (!gst_tag_list_peek_string_index (list, tag, i, &str))
701 g_return_val_if_reached (NULL);
703 /* special case: GST_TAG_EXTENDED_COMMENT */
704 if (vorbis_tag == NULL) {
705 gchar *key = NULL, *val = NULL;
707 if (gst_tag_parse_extended_comment (str, &key, NULL, &val, TRUE)) {
708 result = g_strdup_printf ("%s=%s", key, val);
712 GST_WARNING ("Not a valid extended comment string: %s", str);
716 result = g_strdup_printf ("%s=%s", vorbis_tag, str);
722 gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
724 if (!gst_tag_list_get_double_index (list, tag, i, &value))
725 g_return_val_if_reached (NULL);
726 g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f", value);
727 result = g_strconcat (vorbis_tag, "=", buf, NULL);
731 if (tag_type == G_TYPE_DATE) {
734 if (!gst_tag_list_get_date_index (list, tag, i, &date))
735 g_return_val_if_reached (NULL);
737 /* vorbis suggests using ISO date formats */
739 g_strdup_printf ("%s=%04d-%02d-%02d", vorbis_tag,
740 (gint) g_date_get_year (date), (gint) g_date_get_month (date),
741 (gint) g_date_get_day (date));
744 GST_DEBUG ("Couldn't write tag %s", tag);
750 l = g_list_prepend (l, result);
753 return g_list_reverse (l);
757 write_one_tag (const GstTagList * list, const gchar * tag, gpointer user_data)
759 MyForEach *data = (MyForEach *) user_data;
763 comments = gst_tag_to_vorbis_comments (list, tag);
765 for (it = comments; it != NULL; it = it->next) {
766 gchar *result = it->data;
769 data->data_count += strlen (result);
770 data->entries = g_list_prepend (data->entries, result);
773 g_list_free (comments);
777 * gst_tag_list_to_vorbiscomment_buffer:
778 * @list: tag list to convert
779 * @id_data: identification data at start of stream
780 * @id_data_length: length of identification data, may be 0 if @id_data is NULL
781 * @vendor_string: string that describes the vendor string or NULL
783 * Creates a new vorbiscomment buffer from a tag list.
785 * Returns: A new #GstBuffer containing a vorbiscomment buffer with all tags
786 * that could be converted from the given tag list.
789 gst_tag_list_to_vorbiscomment_buffer (const GstTagList * list,
790 const guint8 * id_data, const guint id_data_length,
791 const gchar * vendor_string)
794 guint8 *data, *odata;
797 MyForEach my_data = { 0, 0, NULL };
801 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
802 g_return_val_if_fail (id_data != NULL || id_data_length == 0, NULL);
804 if (vendor_string == NULL)
805 vendor_string = "GStreamer encoded vorbiscomment";
806 vendor_len = strlen (vendor_string);
807 required_size = id_data_length + 4 + vendor_len + 4 + 1;
808 gst_tag_list_foreach ((GstTagList *) list, write_one_tag, &my_data);
809 required_size += 4 * my_data.count + my_data.data_count;
811 buffer = gst_buffer_new_and_alloc (required_size);
812 odata = data = gst_buffer_map (buffer, NULL, NULL, GST_MAP_WRITE);
813 if (id_data_length > 0) {
814 memcpy (data, id_data, id_data_length);
815 data += id_data_length;
817 GST_WRITE_UINT32_LE (data, vendor_len);
819 memcpy (data, vendor_string, vendor_len);
821 l = my_data.entries = g_list_reverse (my_data.entries);
822 GST_WRITE_UINT32_LE (data, my_data.count);
824 for (i = 0; i < my_data.count; i++) {
828 g_assert (l != NULL);
832 GST_WRITE_UINT32_LE (data, size);
834 memcpy (data, cur, size);
837 g_list_foreach (my_data.entries, (GFunc) g_free, NULL);
838 g_list_free (my_data.entries);
840 gst_buffer_unmap (buffer, odata, required_size);