/* GStreamer
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* gstvorbistag.c: library for reading / modifying vorbis tags
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gsttagvorbis
* @title: GstVorbisTag
* @short_description: tag mappings and support functions for plugins
* dealing with vorbiscomments
* @see_also: #GstTagList
*
* Contains various utility functions for plugins to parse or create
* vorbiscomments and map them to and from #GstTagList<!-- -->s.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gsttagsetter.h>
#include <gst/base/gstbytereader.h>
#include <gst/base/gstbytewriter.h>
#include "gsttageditingprivate.h"
#include <stdlib.h>
#include <string.h>
/*
* see http://xiph.org/ogg/vorbis/doc/v-comment.html
*/
static const GstTagEntryMatch tag_matches[] = {
{GST_TAG_TITLE, "TITLE"},
{GST_TAG_VERSION, "VERSION"},
{GST_TAG_ALBUM, "ALBUM"},
{GST_TAG_TRACK_NUMBER, "TRACKNUMBER"},
{GST_TAG_ALBUM_VOLUME_NUMBER, "DISCNUMBER"},
{GST_TAG_TRACK_COUNT, "TRACKTOTAL"},
{GST_TAG_TRACK_COUNT, "TOTALTRACKS"}, /* old / non-standard */
{GST_TAG_ALBUM_VOLUME_COUNT, "DISCTOTAL"},
{GST_TAG_ALBUM_VOLUME_COUNT, "TOTALDISCS"}, /* old / non-standard */
{GST_TAG_ARTIST, "ARTIST"},
{GST_TAG_PERFORMER, "PERFORMER"},
{GST_TAG_COMPOSER, "COMPOSER"},
{GST_TAG_COPYRIGHT, "COPYRIGHT"},
{GST_TAG_LICENSE, "LICENSE"},
{GST_TAG_LICENSE_URI, "LICENSE"},
{GST_TAG_GEO_LOCATION_NAME, "LOCATION"},
{GST_TAG_ORGANIZATION, "ORGANIZATION"},
{GST_TAG_DESCRIPTION, "DESCRIPTION"},
{GST_TAG_GENRE, "GENRE"},
{GST_TAG_DATE_TIME, "DATE"},
{GST_TAG_CONTACT, "CONTACT"},
{GST_TAG_ISRC, "ISRC"},
{GST_TAG_COMMENT, "COMMENT"},
{GST_TAG_TRACK_GAIN, "REPLAYGAIN_TRACK_GAIN"},
{GST_TAG_TRACK_PEAK, "REPLAYGAIN_TRACK_PEAK"},
{GST_TAG_ALBUM_GAIN, "REPLAYGAIN_ALBUM_GAIN"},
{GST_TAG_ALBUM_PEAK, "REPLAYGAIN_ALBUM_PEAK"},
{GST_TAG_REFERENCE_LEVEL, "REPLAYGAIN_REFERENCE_LOUDNESS"},
{GST_TAG_MUSICBRAINZ_TRACKID, "MUSICBRAINZ_TRACKID"},
{GST_TAG_MUSICBRAINZ_ARTISTID, "MUSICBRAINZ_ARTISTID"},
{GST_TAG_MUSICBRAINZ_ALBUMID, "MUSICBRAINZ_ALBUMID"},
{GST_TAG_MUSICBRAINZ_ALBUMARTISTID, "MUSICBRAINZ_ALBUMARTISTID"},
{GST_TAG_MUSICBRAINZ_TRMID, "MUSICBRAINZ_TRMID"},
{GST_TAG_ARTIST_SORTNAME, "ARTISTSORT"},
{GST_TAG_ARTIST_SORTNAME, "ARTISTSORTORDER"},
{GST_TAG_ARTIST_SORTNAME, "MUSICBRAINZ_SORTNAME"},
{GST_TAG_ALBUM_SORTNAME, "ALBUMSORT"},
{GST_TAG_ALBUM_SORTNAME, "ALBUMSORTORDER"},
{GST_TAG_TITLE_SORTNAME, "TITLESORT"},
{GST_TAG_TITLE_SORTNAME, "TITLESORTORDER"},
{GST_TAG_ALBUM_ARTIST, "ALBUMARTIST"},
{GST_TAG_ALBUM_ARTIST, "ALBUM ARTIST"},
{GST_TAG_ALBUM_ARTIST_SORTNAME, "ALBUMARTISTSORT"},
{GST_TAG_ALBUM_ARTIST_SORTNAME, "ALBUMARTISTSORTORDER"},
{GST_TAG_LANGUAGE_CODE, "LANGUAGE"},
{GST_TAG_CDDA_MUSICBRAINZ_DISCID, "MUSICBRAINZ_DISCID"},
{GST_TAG_CDDA_CDDB_DISCID, "DISCID"},
/* For the apparent de-facto standard for coverart in vorbis comments, see:
* http://www.hydrogenaudio.org/forums/lofiversion/index.php/t48386.html */
{GST_TAG_PREVIEW_IMAGE, "COVERART"},
/* some evidence that "BPM" is used elsewhere:
* http://mail.kde.org/pipermail/amarok/2006-May/000090.html
*/
{GST_TAG_BEATS_PER_MINUTE, "BPM"},
/* What GStreamer calls encoder ("encoder used to encode this stream") is
stored in the vendor string in Vorbis/Theora/Kate and possibly others.
The Vorbis comment packet used in those streams uses ENCODER as the name
of the encoding program, which GStreamer calls application-name. */
{GST_TAG_APPLICATION_NAME, "ENCODER"},
{NULL, NULL}
};
/**
* gst_tag_from_vorbis_tag:
* @vorbis_tag: vorbiscomment tag to convert to GStreamer tag
*
* Looks up the GStreamer tag for a vorbiscomment tag.
*
* Returns: The corresponding GStreamer tag or NULL if none exists.
*/
const gchar *
gst_tag_from_vorbis_tag (const gchar * vorbis_tag)
{
int i = 0;
gchar *real_vorbis_tag;
g_return_val_if_fail (vorbis_tag != NULL, NULL);
gst_tag_register_musicbrainz_tags ();
real_vorbis_tag = g_ascii_strup (vorbis_tag, -1);
while (tag_matches[i].gstreamer_tag != NULL) {
if (strcmp (real_vorbis_tag, tag_matches[i].original_tag) == 0) {
break;
}
i++;
}
g_free (real_vorbis_tag);
return tag_matches[i].gstreamer_tag;
}
/**
* gst_tag_to_vorbis_tag:
* @gst_tag: GStreamer tag to convert to vorbiscomment tag
*
* Looks up the vorbiscomment tag for a GStreamer tag.
*
* Returns: The corresponding vorbiscomment tag or NULL if none exists.
*/
const gchar *
gst_tag_to_vorbis_tag (const gchar * gst_tag)
{
int i = 0;
g_return_val_if_fail (gst_tag != NULL, NULL);
gst_tag_register_musicbrainz_tags ();
while (tag_matches[i].gstreamer_tag != NULL) {
if (strcmp (gst_tag, tag_matches[i].gstreamer_tag) == 0) {
return tag_matches[i].original_tag;
}
i++;
}
return NULL;
}
/**
* gst_vorbis_tag_add:
* @list: a #GstTagList
* @tag: a vorbiscomment tag string (key in key=value), must be valid UTF-8
* @value: a vorbiscomment value string (value in key=value), must be valid UTF-8
*
* Convenience function using gst_tag_from_vorbis_tag(), parsing
* a vorbis comment string into the right type and adding it to the
* given taglist @list.
*
* Unknown vorbiscomment tags will be added to the tag list in form
* of a #GST_TAG_EXTENDED_COMMENT.
*/
void
gst_vorbis_tag_add (GstTagList * list, const gchar * tag, const gchar * value)
{
const gchar *gst_tag;
GType tag_type;
g_return_if_fail (list != NULL);
g_return_if_fail (tag != NULL);
g_return_if_fail (value != NULL);
g_return_if_fail (g_utf8_validate (tag, -1, NULL));
g_return_if_fail (g_utf8_validate (value, -1, NULL));
g_return_if_fail (strchr (tag, '=') == NULL);
gst_tag = gst_tag_from_vorbis_tag (tag);
if (gst_tag == NULL) {
gchar *ext_comment;
ext_comment = g_strdup_printf ("%s=%s", tag, value);
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, GST_TAG_EXTENDED_COMMENT,
ext_comment, NULL);
g_free (ext_comment);
return;
}
tag_type = gst_tag_get_type (gst_tag);
switch (tag_type) {
case G_TYPE_UINT:{
guint tmp;
gchar *check;
gboolean is_track_number_tag;
gboolean is_disc_number_tag;
is_track_number_tag = (strcmp (gst_tag, GST_TAG_TRACK_NUMBER) == 0);
is_disc_number_tag = (strcmp (gst_tag, GST_TAG_ALBUM_VOLUME_NUMBER) == 0);
tmp = strtoul (value, &check, 10);
if (*check == '/' && (is_track_number_tag || is_disc_number_tag)) {
guint count;
check++;
count = strtoul (check, &check, 10);
if (*check != '\0' || count == 0)
break;
if (is_track_number_tag) {
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, GST_TAG_TRACK_COUNT,
count, NULL);
} else {
gst_tag_list_add (list, GST_TAG_MERGE_APPEND,
GST_TAG_ALBUM_VOLUME_COUNT, count, NULL);
}
}
if (*check == '\0') {
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag, tmp, NULL);
}
break;
}
case G_TYPE_STRING:{
gchar *valid = NULL;
/* specialcase for language code */
if (strcmp (tag, "LANGUAGE") == 0) {
const gchar *s = strchr (value, '[');
/* Accept both ISO-639-1 and ISO-639-2 codes */
if (s && strchr (s, ']') == s + 4) {
valid = g_strndup (s + 1, 3);
} else if (s && strchr (s, ']') == s + 3) {
valid = g_strndup (s + 1, 2);
} else if (strlen (value) != 2 && strlen (value) != 3) {
GST_WARNING ("doesn't contain an ISO-639 language code: %s", value);
}
} else if (strcmp (tag, "LICENSE") == 0) {
/* license tags in vorbis comments must contain an URI representing
* the license and nothing more, at least according to:
* http://wiki.xiph.org/index.php/LICENSE_and_COPYRIGHT_tags_on_Vorbis_Comments */
if (value && gst_uri_is_valid (value))
gst_tag = GST_TAG_LICENSE_URI;
}
if (!valid) {
valid = g_strdup (value);
}
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag, valid, NULL);
g_free (valid);
break;
}
case G_TYPE_DOUBLE:{
gchar *c;
c = g_strdup (value);
g_strdelimit (c, ",", '.');
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag,
g_strtod (c, NULL), NULL);
g_free (c);
break;
}
default:{
if (tag_type == GST_TYPE_DATE_TIME) {
GstDateTime *datetime;
datetime = gst_date_time_new_from_iso8601_string (value);
if (datetime) {
gst_tag_list_add (list, GST_TAG_MERGE_APPEND, gst_tag, datetime,
NULL);
gst_date_time_unref (datetime);
} else {
GST_WARNING ("could not parse datetime string '%s'", value);
}
} else {
GST_WARNING ("Unhandled tag of type '%s' (%d)",
g_type_name (tag_type), (gint) tag_type);
}
break;
}
}
}
static void
gst_vorbis_tag_add_coverart (GstTagList * tags, gchar * img_data_base64,
gint base64_len)
{
GstSample *img;
gsize img_len;
if (base64_len < 2)
goto not_enough_data;
/* img_data_base64 points to a temporary copy of the base64 encoded data, so
* it's safe to do inpace decoding here
*/
g_base64_decode_inplace (img_data_base64, &img_len);
if (img_len == 0)
goto decode_failed;
img =
gst_tag_image_data_to_image_sample ((const guint8 *) img_data_base64,
img_len, GST_TAG_IMAGE_TYPE_NONE);
if (img == NULL)
goto convert_failed;
gst_tag_list_add (tags, GST_TAG_MERGE_APPEND,
GST_TAG_PREVIEW_IMAGE, img, NULL);
gst_sample_unref (img);
return;
/* ERRORS */
not_enough_data:
{
GST_WARNING ("COVERART tag with too little base64-encoded data");
return;
}
decode_failed:
{
GST_WARNING ("Couldn't decode base64 image data from COVERART tag");
return;
}
convert_failed:
{
GST_WARNING ("Couldn't extract image or image type from COVERART tag");
return;
}
}
/* Standardized way of adding pictures to vorbiscomments:
* http://wiki.xiph.org/VorbisComment#METADATA_BLOCK_PICTURE
*/
static void
gst_vorbis_tag_add_metadata_block_picture (GstTagList * tags,
gchar * value, gint value_len)
{
GstByteReader reader;
guint32 img_len = 0, img_type = 0;
guint32 img_mimetype_len = 0, img_description_len = 0;
gsize decoded_len;
const guint8 *data = NULL;
/* img_data_base64 points to a temporary copy of the base64 encoded data, so
* it's safe to do inpace decoding here
*/
g_base64_decode_inplace (value, &decoded_len);
if (decoded_len == 0)
goto decode_failed;
gst_byte_reader_init (&reader, (guint8 *) value, decoded_len);
if (!gst_byte_reader_get_uint32_be (&reader, &img_type))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_mimetype_len))
goto error;
if (!gst_byte_reader_skip (&reader, img_mimetype_len))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_description_len))
goto error;
if (!gst_byte_reader_skip (&reader, img_description_len))
goto error;
/* Skip width, height, color depth and number of colors for
* indexed formats */
if (!gst_byte_reader_skip (&reader, 4 * 4))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_len))
goto error;
if (!gst_byte_reader_get_data (&reader, img_len, &data))
goto error;
gst_tag_list_add_id3_image (tags, data, img_len, img_type);
return;
error:
GST_WARNING
("Couldn't extract image or image type from METADATA_BLOCK_PICTURE tag");
return;
decode_failed:
GST_WARNING ("Failed to decode Base64 data from METADATA_BLOCK_PICTURE tag");
return;
}
/**
* gst_tag_list_from_vorbiscomment:
* @data: (array length=size): data to convert
* @size: size of @data
* @id_data: (array length=id_data_length): identification data at start of stream
* @id_data_length: length of identification data
* @vendor_string: (out) (optional): pointer to a string that should take the
* vendor string of this vorbis comment or NULL if you don't need it.
*
* Creates a new tag list that contains the information parsed out of a
* vorbiscomment packet.
*
* Returns: A new #GstTagList with all tags that could be extracted from the
* given vorbiscomment buffer or NULL on error.
*/
GstTagList *
gst_tag_list_from_vorbiscomment (const guint8 * data, gsize size,
const guint8 * id_data, const guint id_data_length, gchar ** vendor_string)
{
#define ADVANCE(x) G_STMT_START{ \
data += x; \
size -= x; \
if (size < 4) goto error; \
cur_size = GST_READ_UINT32_LE (data); \
data += 4; \
size -= 4; \
if (cur_size > size) goto error; \
cur = (gchar*)data; \
}G_STMT_END
gchar *cur, *value;
guint cur_size;
guint iterations;
guint value_len;
GstTagList *list;
g_return_val_if_fail (data != NULL, NULL);
g_return_val_if_fail (id_data != NULL || id_data_length == 0, NULL);
list = gst_tag_list_new_empty ();
if (size < 11 || size <= id_data_length + 4)
goto error;
if (id_data_length > 0 && memcmp (data, id_data, id_data_length) != 0)
goto error;
ADVANCE (id_data_length);
if (vendor_string)
*vendor_string = g_strndup (cur, cur_size);
ADVANCE (cur_size);
iterations = cur_size;
cur_size = 0;
while (iterations) {
ADVANCE (cur_size);
iterations--;
cur = g_strndup (cur, cur_size);
value = strchr (cur, '=');
if (value == NULL) {
g_free (cur);
continue;
}
*value = '\0';
value++;
value_len = strlen (value);
if (value_len == 0 || !g_utf8_validate (value, value_len, NULL)) {
g_free (cur);
continue;
}
/* we'll just ignore COVERARTMIME and typefind the image data */
if (g_ascii_strcasecmp (cur, "COVERARTMIME") == 0) {
g_free (cur);
continue;
} else if (g_ascii_strcasecmp (cur, "COVERART") == 0) {
gst_vorbis_tag_add_coverart (list, value, value_len);
} else if (g_ascii_strcasecmp (cur, "METADATA_BLOCK_PICTURE") == 0) {
gst_vorbis_tag_add_metadata_block_picture (list, value, value_len);
} else if (g_utf8_validate (cur, -1, NULL)) {
gst_vorbis_tag_add (list, cur, value);
}
g_free (cur);
}
return list;
error:
if (vendor_string && *vendor_string) {
g_free (*vendor_string);
*vendor_string = NULL;
}
gst_tag_list_unref (list);
return NULL;
#undef ADVANCE
}
/**
* gst_tag_list_from_vorbiscomment_buffer:
* @buffer: buffer to convert
* @id_data: (array length=id_data_length): identification data at start of stream
* @id_data_length: length of identification data
* @vendor_string: (out) (optional): pointer to a string that should take the
* vendor string of this vorbis comment or NULL if you don't need it.
*
* Creates a new tag list that contains the information parsed out of a
* vorbiscomment packet.
*
* Returns: A new #GstTagList with all tags that could be extracted from the
* given vorbiscomment buffer or NULL on error.
*/
GstTagList *
gst_tag_list_from_vorbiscomment_buffer (GstBuffer * buffer,
const guint8 * id_data, const guint id_data_length, gchar ** vendor_string)
{
GstTagList *res;
GstMapInfo info;
if (!gst_buffer_map (buffer, &info, GST_MAP_READ))
g_return_val_if_reached (NULL);
res =
gst_tag_list_from_vorbiscomment (info.data, info.size, id_data,
id_data_length, vendor_string);
gst_buffer_unmap (buffer, &info);
return res;
}
typedef struct
{
guint count;
guint data_count;
GList *entries;
}
MyForEach;
static GList *
gst_tag_to_metadata_block_picture (const gchar * tag,
const GValue * image_value)
{
gchar *comment_data, *data_result;
const gchar *mime_type;
guint mime_type_len;
GstStructure *mime_struct;
GstSample *sample;
GstBuffer *buffer;
GstCaps *caps;
GList *l = NULL;
GstMapInfo mapinfo = { 0, };
GstByteWriter writer;
GstTagImageType image_type = GST_TAG_IMAGE_TYPE_NONE;
gint width = 0, height = 0;
guint8 *metadata_block;
guint metadata_block_len;
g_return_val_if_fail (image_value != NULL, NULL);
sample = gst_value_get_sample (image_value);
buffer = gst_sample_get_buffer (sample);
caps = gst_sample_get_caps (sample);
g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
mime_struct = gst_caps_get_structure (caps, 0);
mime_type = gst_structure_get_name (mime_struct);
if (strcmp (mime_type, "text/uri-list") == 0)
mime_type = "-->";
mime_type_len = strlen (mime_type);
/* FIXME 2.0: Remove the image-type reading from the caps, this was
* a bug until 1.2.2. The image-type is only supposed to be in the
* info structure */
gst_structure_get (mime_struct, "image-type", GST_TYPE_TAG_IMAGE_TYPE,
&image_type, "width", G_TYPE_INT, &width, "height", G_TYPE_INT, &height,
NULL);
if (image_type == GST_TAG_IMAGE_TYPE_NONE) {
const GstStructure *info_struct;
info_struct = gst_sample_get_info (sample);
if (info_struct && gst_structure_has_name (info_struct, "GstTagImageInfo")) {
gst_structure_get (info_struct, "image-type", GST_TYPE_TAG_IMAGE_TYPE,
&image_type, NULL);
}
}
metadata_block_len = 32 + mime_type_len + gst_buffer_get_size (buffer);
gst_byte_writer_init_with_size (&writer, metadata_block_len, TRUE);
if (image_type == GST_TAG_IMAGE_TYPE_NONE
&& strcmp (tag, GST_TAG_PREVIEW_IMAGE) == 0) {
gst_byte_writer_put_uint32_be_unchecked (&writer, 0x01);
} else {
/* Convert to ID3v2 APIC image type */
if (image_type == GST_TAG_IMAGE_TYPE_NONE)
image_type = GST_TAG_IMAGE_TYPE_UNDEFINED;
else
image_type = image_type + 2;
gst_byte_writer_put_uint32_be_unchecked (&writer, image_type);
}
gst_byte_writer_put_uint32_be_unchecked (&writer, mime_type_len);
gst_byte_writer_put_data_unchecked (&writer, (guint8 *) mime_type,
mime_type_len);
/* description length */
gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
gst_byte_writer_put_uint32_be_unchecked (&writer, width);
gst_byte_writer_put_uint32_be_unchecked (&writer, height);
/* color depth */
gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
/* for indexed formats the number of colors */
gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
if (gst_buffer_map (buffer, &mapinfo, GST_MAP_READ)) {
gst_byte_writer_put_uint32_be_unchecked (&writer, mapinfo.size);
gst_byte_writer_put_data_unchecked (&writer, mapinfo.data, mapinfo.size);
gst_buffer_unmap (buffer, &mapinfo);
} else {
GST_WARNING ("Failed to map vorbistag image buffer");
gst_byte_writer_reset (&writer);
return NULL; /* List is always null up to here */
}
g_assert (gst_byte_writer_get_pos (&writer) == metadata_block_len);
metadata_block = gst_byte_writer_reset_and_get_data (&writer);
comment_data = g_base64_encode (metadata_block, metadata_block_len);
g_free (metadata_block);
data_result = g_strdup_printf ("METADATA_BLOCK_PICTURE=%s", comment_data);
g_free (comment_data);
l = g_list_append (l, data_result);
return l;
}
/**
* gst_tag_to_vorbis_comments:
* @list: a #GstTagList
* @tag: a GStreamer tag identifier, such as #GST_TAG_ARTIST
*
* Creates a new tag list that contains the information parsed out of a
* vorbiscomment packet.
*
* Returns: (element-type utf8) (transfer full): A #GList of newly-allocated
* key=value strings. Free with g_list_foreach (list, (GFunc) g_free, NULL)
* plus g_list_free (list)
*/
GList *
gst_tag_to_vorbis_comments (const GstTagList * list, const gchar * tag)
{
const gchar *vorbis_tag = NULL;
GList *l = NULL;
guint i;
g_return_val_if_fail (list != NULL, NULL);
g_return_val_if_fail (tag != NULL, NULL);
/* Special case: cover art is split into two tags to store data and
* MIME-type. Even if the tag list contains multiple entries, there is
* no reasonable way to save more than one.
* If both, preview image and image, are present we prefer the
* image tag.
*/
if ((strcmp (tag, GST_TAG_PREVIEW_IMAGE) == 0 &&
gst_tag_list_get_tag_size (list, GST_TAG_IMAGE) == 0) ||
strcmp (tag, GST_TAG_IMAGE) == 0) {
return gst_tag_to_metadata_block_picture (tag,
gst_tag_list_get_value_index (list, tag, 0));
}
if (strcmp (tag, GST_TAG_EXTENDED_COMMENT) != 0) {
vorbis_tag = gst_tag_to_vorbis_tag (tag);
if (!vorbis_tag)
return NULL;
}
/* FIXME: for tags that can map to multiple vorbis comment keys, add all
* of the possible keys */
for (i = 0; i < gst_tag_list_get_tag_size (list, tag); i++) {
GType tag_type = gst_tag_get_type (tag);
gchar *result = NULL;
switch (tag_type) {
case G_TYPE_UINT:{
guint u;
if (!gst_tag_list_get_uint_index (list, tag, i, &u))
g_return_val_if_reached (NULL);
result = g_strdup_printf ("%s=%u", vorbis_tag, u);
break;
}
case G_TYPE_STRING:{
const gchar *str = NULL;
if (!gst_tag_list_peek_string_index (list, tag, i, &str))
g_return_val_if_reached (NULL);
/* special case: GST_TAG_EXTENDED_COMMENT */
if (vorbis_tag == NULL) {
gchar *key = NULL, *val = NULL;
if (gst_tag_parse_extended_comment (str, &key, NULL, &val, TRUE)) {
result = g_strdup_printf ("%s=%s", key, val);
g_free (key);
g_free (val);
} else {
GST_WARNING ("Not a valid extended comment string: %s", str);
continue;
}
} else {
result = g_strdup_printf ("%s=%s", vorbis_tag, str);
}
break;
}
case G_TYPE_DOUBLE:{
gdouble value;
gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
if (!gst_tag_list_get_double_index (list, tag, i, &value))
g_return_val_if_reached (NULL);
g_ascii_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f", value);
result = g_strconcat (vorbis_tag, "=", buf, NULL);
break;
}
default:{
if (tag_type == GST_TYPE_DATE_TIME) {
GstDateTime *datetime;
if (gst_tag_list_get_date_time_index (list, tag, i, &datetime)) {
gchar *string;
/* vorbis suggests using ISO date formats:
* http://wiki.xiph.org/VorbisComment#Date_and_time */
string = gst_date_time_to_iso8601_string (datetime);
result = g_strdup_printf ("%s=%s", vorbis_tag, string);
g_free (string);
gst_date_time_unref (datetime);
}
} else {
GST_DEBUG ("Couldn't write tag %s", tag);
continue;
}
break;
}
}
l = g_list_prepend (l, result);
}
return g_list_reverse (l);
}
static void
write_one_tag (const GstTagList * list, const gchar * tag, gpointer user_data)
{
MyForEach *data = (MyForEach *) user_data;
GList *comments;
GList *it;
comments = gst_tag_to_vorbis_comments (list, tag);
for (it = comments; it != NULL; it = it->next) {
gchar *result = it->data;
data->count++;
data->data_count += strlen (result);
data->entries = g_list_prepend (data->entries, result);
}
g_list_free (comments);
}
/**
* gst_tag_list_to_vorbiscomment_buffer:
* @list: tag list to convert
* @id_data: (array length=id_data_length): identification data at start of stream
* @id_data_length: length of identification data, may be 0 if @id_data is NULL
* @vendor_string: (nullable): string that describes the vendor string or NULL
*
* Creates a new vorbiscomment buffer from a tag list.
*
* Returns: A new #GstBuffer containing a vorbiscomment buffer with all tags
* that could be converted from the given tag list.
*/
GstBuffer *
gst_tag_list_to_vorbiscomment_buffer (const GstTagList * list,
const guint8 * id_data, const guint id_data_length,
const gchar * vendor_string)
{
GstBuffer *buffer;
GstMapInfo info;
guint8 *data;
guint i;
GList *l;
MyForEach my_data = { 0, 0, NULL };
guint vendor_len;
int required_size;
g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
g_return_val_if_fail (id_data != NULL || id_data_length == 0, NULL);
if (vendor_string == NULL)
vendor_string = "GStreamer encoded vorbiscomment";
vendor_len = strlen (vendor_string);
required_size = id_data_length + 4 + vendor_len + 4 + 1;
gst_tag_list_foreach ((GstTagList *) list, write_one_tag, &my_data);
required_size += 4 * my_data.count + my_data.data_count;
buffer = gst_buffer_new_and_alloc (required_size);
gst_buffer_map (buffer, &info, GST_MAP_WRITE);
data = info.data;
if (id_data_length > 0) {
memcpy (data, id_data, id_data_length);
data += id_data_length;
}
GST_WRITE_UINT32_LE (data, vendor_len);
data += 4;
memcpy (data, vendor_string, vendor_len);
data += vendor_len;
l = my_data.entries = g_list_reverse (my_data.entries);
GST_WRITE_UINT32_LE (data, my_data.count);
data += 4;
for (i = 0; i < my_data.count; i++) {
guint size;
gchar *cur;
g_assert (l != NULL);
cur = l->data;
l = g_list_next (l);
size = strlen (cur);
GST_WRITE_UINT32_LE (data, size);
data += 4;
memcpy (data, cur, size);
data += size;
}
g_list_foreach (my_data.entries, (GFunc) g_free, NULL);
g_list_free (my_data.entries);
*data = 1;
gst_buffer_unmap (buffer, &info);
return buffer;
}