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Check environment variables GST_ID3V2_TAG_ENCODING,

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Original commit message from CVS:
Check environment variables GST_ID3V2_TAG_ENCODING,
GST_ID3_TAG_ENCODING and GST_TAG_ENCODING for a colon-separated
list of character encodings to force interpretation of non-unicode
strings stored in an ID3v2 tag to a particular encoding. If none
is specified, try to use current locale's encoding, then fall back
to ISO-8859-1 (which will always succeed). (Resolves #149274)

Check environment variables GST_ID3V1_TAG_ENCODING,
GST_ID3_TAG_ENCODING and GST_TAG_ENCODING for a colon-separated
list of character encodings to use in case a string encountered
in an ID3v1 tag is not valid UTF-8 already. If no encoding is
specified, try to use the current locale's encoding, then fall
back to ISO-8859-1 (which will always succeed).
This commit is contained in:
Tim-Philipp Müller 2005-01-26 12:38:02 +00:00
parent 804052d1ef
commit 913dd3f78e
2 changed files with 147 additions and 28 deletions
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19
ChangeLog
View file

@ -1,3 +1,22 @@
2005-01-26 Tim-Philipp Müller <tim at centricular dot net>
* ext/mad/gstid3tag.c: (mad_id3_parse_latin1_string),
(mad_id3_parse_comment_frame), (gst_mad_id3_to_tag_list):
Check environment variables GST_ID3V2_TAG_ENCODING,
GST_ID3_TAG_ENCODING and GST_TAG_ENCODING for a colon-separated
list of character encodings to force interpretation of non-unicode
strings stored in an ID3v2 tag to a particular encoding. If none
is specified, try to use current locale's encoding, then fall back
to ISO-8859-1 (which will always succeed). (Resolves #149274)
* gst/tags/gstid3tag.c: (gst_tag_from_id3_tag),
(gst_tag_extract_id3v1_string), (gst_tag_list_new_from_id3v1):
Check environment variables GST_ID3V1_TAG_ENCODING,
GST_ID3_TAG_ENCODING and GST_TAG_ENCODING for a colon-separated
list of character encodings to use in case a string encountered
in an ID3v1 tag is not valid UTF-8 already. If no encoding is
specified, try to use the current locale's encoding, then fall
back to ISO-8859-1 (which will always succeed).
2005-01-25 Benjamin Otte <otte@gnome.org>
* ext/mad/gstmad.c: (gst_mad_check_caps_reset), (gst_mad_chain):

156
ext/mad/gstid3tag.c
View file

@ -522,6 +522,113 @@ gst_id3_tag_src_event (GstPad * pad, GstEvent * event)
return FALSE;
}
static id3_utf8_t *
mad_id3_parse_latin1_string (const id3_ucs4_t * ucs4)
{
gsize bytes_read, size;
const gchar *env;
char *latin1, *ret = NULL;
latin1 = id3_ucs4_latin1duplicate (ucs4);
if (latin1 == NULL)
return NULL;
size = strlen (latin1);
env = g_getenv ("GST_ID3V2_TAG_ENCODING");
if (!env || *env == '\0')
env = g_getenv ("GST_ID3_TAG_ENCODING");
if (!env || *env == '\0')
env = g_getenv ("GST_TAG_ENCODING");
if (env && *env != '\0') {
gchar **c, **csets;
csets = g_strsplit (env, G_SEARCHPATH_SEPARATOR_S, -1);
for (c = csets; !ret && c && *c; ++c) {
gchar *utf8;
if ((utf8 =
g_convert (latin1, size, "UTF-8", *c, &bytes_read, NULL, NULL))) {
if (bytes_read == size) {
ret = strdup (utf8);
}
g_free (utf8);
}
}
g_strfreev (csets);
}
/* Try current locale (if not UTF-8). Should we really do this?
* What if the tag is really correct and in ISO-8859-1 and the
* current locale is some other charset where the full byte range
* is valid? In those cases ISO-8859-1 would have to be put into
* one of the above environment variables. Do the most common
* non-Western and non-UTF8 character sets modify only the range
* from 0x80-0xff, so that ASCII is still covered at least?) */
if (!ret && !g_get_charset (&env)) {
gchar *utf8;
if ((utf8 = g_locale_to_utf8 (latin1, size, &bytes_read, NULL, NULL))) {
if (bytes_read == size) {
ret = strdup (utf8);
}
g_free (utf8);
}
}
/* Try ISO-8859-1 (this conversion should always suceed) */
if (!ret) {
gchar *utf8;
utf8 =
g_convert (latin1, size, "UTF-8", "ISO-8859-1", &bytes_read, NULL,
NULL);
if (utf8 != NULL && bytes_read == size) {
ret = strdup (utf8);
}
g_free (utf8);
}
free (latin1);
return ret;
}
static void
mad_id3_parse_comment_frame (GstTagList * tlist, const struct id3_frame *frame)
{
const id3_ucs4_t *ucs4;
id3_utf8_t *utf8;
g_assert (frame->nfields >= 4);
ucs4 = id3_field_getfullstring (&frame->fields[3]);
g_assert (ucs4);
if (frame->fields[0].type == ID3_FIELD_TYPE_TEXTENCODING
&& frame->fields[0].number.value == ID3_FIELD_TEXTENCODING_ISO_8859_1) {
utf8 = mad_id3_parse_latin1_string (ucs4);
} else {
utf8 = id3_ucs4_utf8duplicate (ucs4);
}
if (utf8 == NULL)
return;
if (!g_utf8_validate (utf8, -1, NULL)) {
g_warning ("converted string is not valid utf-8");
g_free (utf8);
return;
}
g_strchomp (utf8);
gst_tag_list_add (tlist, GST_TAG_MERGE_APPEND, GST_TAG_COMMENT, utf8, NULL);
g_free (utf8);
}
GstTagList *
gst_mad_id3_to_tag_list (const struct id3_tag * tag)
{
@ -534,52 +641,45 @@ gst_mad_id3_to_tag_list (const struct id3_tag * tag)
tag_list = gst_tag_list_new ();
while ((frame = id3_tag_findframe (tag, NULL, i++)) != NULL) {
const union id3_field *field;
const union id3_field *field, *encfield;
unsigned int nstrings, j;
const gchar *tag_name;
/* find me the function to query the frame id */
gchar *id = g_strndup (frame->id, 5);
tag_name = gst_tag_from_id3_tag (frame->id);
if (tag_name == NULL)
continue;
tag_name = gst_tag_from_id3_tag (id);
if (tag_name == NULL) {
g_free (id);
if (strncmp (frame->id, "COMM", 5) == 0) {
mad_id3_parse_comment_frame (tag_list, frame);
continue;
}
if (strcmp (id, "COMM") == 0) {
ucs4 = id3_field_getfullstring (&frame->fields[3]);
g_assert (ucs4);
utf8 = id3_ucs4_utf8duplicate (ucs4);
if (utf8 == 0)
continue;
if (!g_utf8_validate (utf8, -1, NULL)) {
g_warning ("converted string is not valid utf-8");
g_free (utf8);
continue;
}
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_COMMENT, utf8, NULL);
g_free (utf8);
if (frame->id[0] != 'T') {
g_warning ("don't know how to parse ID3v2 frame with ID '%s'", frame->id);
continue;
}
g_assert (frame->nfields >= 2);
field = &frame->fields[1];
nstrings = id3_field_getnstrings (field);
encfield = &frame->fields[0];
for (j = 0; j < nstrings; ++j) {
ucs4 = id3_field_getstrings (field, j);
g_assert (ucs4);
if (strcmp (id, ID3_FRAME_GENRE) == 0)
if (strncmp (frame->id, ID3_FRAME_GENRE, 5) == 0)
ucs4 = id3_genre_name (ucs4);
utf8 = id3_ucs4_utf8duplicate (ucs4);
if (utf8 == 0)
if (encfield->type == ID3_FIELD_TYPE_TEXTENCODING
&& encfield->number.value == ID3_FIELD_TEXTENCODING_ISO_8859_1) {
utf8 = mad_id3_parse_latin1_string (ucs4);
} else {
utf8 = id3_ucs4_utf8duplicate (ucs4);
}
if (utf8 == NULL)
continue;
if (!g_utf8_validate (utf8, -1, NULL)) {
@ -654,13 +754,13 @@ gst_mad_id3_to_tag_list (const struct id3_tag * tag)
}
default:
g_assert (gst_tag_get_type (tag_name) == G_TYPE_STRING);
g_strchomp (utf8);
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND, tag_name, utf8,
NULL);
break;
}
free (utf8);
}
g_free (id);
}
return tag_list;