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gstreamer/gst/id3demux/id3v2frames.c
Tim-Philipp Müller 2e05af3876 id3demux: fix parsing of unsync'ed ID3 v2.4 tags and frames 
Reversing the unsynchronisation seems to work slightly differently
for ID3 v2.3 tags and v2.4 tags: v2.3 tags don't have syncsafe frame
sizes in the frame header, so the unsynchronisation is applied to
the whole frame data including all the frame headers. v2.4 frames
have sync-safe sizes, however, so the unsynchronisation only needs
to be applied to the actual frame data, and it seems that's what's
being done as well. So we need to undo the unsynchronisation on a
per-frame basis for v2.4 tags for things to work properly.

Fixes extraction of coverart/images from APIC frames in ID3 v2.4
tags (#588148).

Add unit test for this as well.
2009-08-07 16:02:23 +01:00

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/* -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
/* Copyright 2006-2008 Tim-Philipp Müller <tim centricular net>
* Copyright 2005 Jan Schmidt <thaytan@mad.scientist.com>
* Copyright 2002,2003 Scott Wheeler <wheeler@kde.org> (portions from taglib)
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <gst/tag/tag.h>
#include <gst/base/gsttypefindhelper.h>
#ifdef HAVE_ZLIB
#include <zlib.h>
#endif
#include "id3tags.h"
GST_DEBUG_CATEGORY_EXTERN (id3demux_debug);
#define GST_CAT_DEFAULT (id3demux_debug)
static gboolean parse_comment_frame (ID3TagsWorking * work);
static gchar *parse_url_link_frame (ID3TagsWorking * work,
const gchar ** tag_name);
static GArray *parse_text_identification_frame (ID3TagsWorking * work);
static gchar *parse_user_text_identification_frame (ID3TagsWorking * work,
const gchar ** tag_name);
static gchar *parse_unique_file_identifier (ID3TagsWorking * work,
const gchar ** tag_name);
static gboolean parse_relative_volume_adjustment_two (ID3TagsWorking * work);
static void parse_obsolete_tdat_frame (ID3TagsWorking * work);
static gboolean id3v2_tag_to_taglist (ID3TagsWorking * work,
const gchar * tag_name, const gchar * tag_str);
/* Parse a single string into an array of gchar* */
static void parse_split_strings (guint8 encoding, gchar * data, gint data_size,
GArray ** out_fields);
static void free_tag_strings (GArray * fields);
static gboolean
id3v2_genre_fields_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
GArray * tag_fields);
static gboolean parse_picture_frame (ID3TagsWorking * work);
#define ID3V2_ENCODING_ISO8859 0x00
#define ID3V2_ENCODING_UTF16 0x01
#define ID3V2_ENCODING_UTF16BE 0x02
#define ID3V2_ENCODING_UTF8 0x03
gboolean
id3demux_id3v2_parse_frame (ID3TagsWorking * work)
{
const gchar *tag_name;
gboolean result = FALSE;
gint i;
guint8 *frame_data = work->hdr.frame_data;
guint frame_data_size = work->cur_frame_size;
gchar *tag_str = NULL;
GArray *tag_fields = NULL;
guint8 *uu_data = NULL;
#ifdef HAVE_ZLIB
guint8 *uncompressed_data = NULL;
#endif
/* Check that the frame id is valid */
for (i = 0; i < 5 && work->frame_id[i] != '\0'; i++) {
if (!g_ascii_isalnum (work->frame_id[i])) {
GST_DEBUG ("Encountered invalid frame_id");
return FALSE;
}
}
/* Can't handle encrypted frames right now (in case we ever do, we'll have
* to do the decryption after the un-unsynchronisation and decompression,
* not here) */
if (work->frame_flags & ID3V2_FRAME_FORMAT_ENCRYPTION) {
GST_WARNING ("Encrypted frames are not supported");
return FALSE;
}
tag_name = gst_tag_from_id3_tag (work->frame_id);
if (tag_name == NULL &&
strncmp (work->frame_id, "RVA2", 4) != 0 &&
strncmp (work->frame_id, "TXXX", 4) != 0 &&
strncmp (work->frame_id, "TDAT", 4) != 0 &&
strncmp (work->frame_id, "UFID", 4) != 0) {
return FALSE;
}
if (work->frame_flags & (ID3V2_FRAME_FORMAT_COMPRESSION |
ID3V2_FRAME_FORMAT_DATA_LENGTH_INDICATOR)) {
if (work->hdr.frame_data_size <= 4)
return FALSE;
work->parse_size = read_synch_uint (frame_data, 4);
frame_data += 4;
frame_data_size -= 4;
if (work->parse_size < frame_data_size) {
GST_WARNING ("ID3v2 frame %s has invalid size %d.", tag_name,
frame_data_size);
return FALSE;
}
}
/* in v2.3 the frame sizes are not syncsafe, so the entire tag had to be
* unsynced. In v2.4 the frame sizes are syncsafe so it's just the frame
* data that needs un-unsyncing, but not the frame headers. */
if (ID3V2_VER_MAJOR (work->hdr.version) == 4) {
if ((work->hdr.flags & ID3V2_HDR_FLAG_UNSYNC) != 0 ||
((work->frame_flags & ID3V2_FRAME_FORMAT_UNSYNCHRONISATION) != 0)) {
GST_DEBUG ("Un-unsyncing frame %s", work->frame_id);
uu_data = id3demux_ununsync_data (frame_data, &frame_data_size);
frame_data = uu_data;
GST_MEMDUMP ("ID3v2 frame (un-unsyced)", frame_data, frame_data_size);
}
}
work->parse_size = frame_data_size;
if (work->frame_flags & ID3V2_FRAME_FORMAT_COMPRESSION) {
#ifdef HAVE_ZLIB
uLongf destSize = work->parse_size;
Bytef *dest, *src;
uncompressed_data = g_malloc (work->parse_size);
dest = (Bytef *) uncompressed_data;
src = (Bytef *) frame_data;
if (uncompress (dest, &destSize, src, frame_data_size) != Z_OK) {
g_free (uncompressed_data);
g_free (uu_data);
return FALSE;
}
if (destSize != work->parse_size) {
GST_WARNING
("Decompressing ID3v2 frame %s did not produce expected size %d bytes (got %lu)",
tag_name, work->parse_size, destSize);
g_free (uncompressed_data);
g_free (uu_data);
return FALSE;
}
work->parse_data = uncompressed_data;
#else
GST_WARNING ("Compressed ID3v2 tag frame could not be decompressed"
" because gstid3demux was compiled without zlib support");
g_free (uu_data);
return FALSE;
#endif
} else {
work->parse_data = frame_data;
}
if (work->frame_id[0] == 'T') {
if (strcmp (work->frame_id, "TDAT") == 0) {
parse_obsolete_tdat_frame (work);
result = TRUE;
} else if (strcmp (work->frame_id, "TXXX") == 0) {
/* Handle user text frame */
tag_str = parse_user_text_identification_frame (work, &tag_name);
} else {
/* Text identification frame */
tag_fields = parse_text_identification_frame (work);
}
} else if (work->frame_id[0] == 'W' && strcmp (work->frame_id, "WXXX") != 0) {
/* URL link frame: ISO-8859-1 encoded, one frame per tag */
tag_str = parse_url_link_frame (work, &tag_name);
} else if (!strcmp (work->frame_id, "COMM")) {
/* Comment */
result = parse_comment_frame (work);
} else if (!strcmp (work->frame_id, "APIC")) {
/* Attached picture */
result = parse_picture_frame (work);
} else if (!strcmp (work->frame_id, "RVA2")) {
/* Relative volume */
result = parse_relative_volume_adjustment_two (work);
} else if (!strcmp (work->frame_id, "UFID")) {
/* Unique file identifier */
tag_str = parse_unique_file_identifier (work, &tag_name);
}
#ifdef HAVE_ZLIB
if (work->frame_flags & ID3V2_FRAME_FORMAT_COMPRESSION) {
g_free (uncompressed_data);
uncompressed_data = NULL;
work->parse_data = frame_data;
}
#endif
if (tag_str != NULL) {
/* g_print ("Tag %s value %s\n", tag_name, tag_str); */
result = id3v2_tag_to_taglist (work, tag_name, tag_str);
g_free (tag_str);
}
if (tag_fields != NULL) {
if (strcmp (work->frame_id, "TCON") == 0) {
/* Genre strings need special treatment */
result |= id3v2_genre_fields_to_taglist (work, tag_name, tag_fields);
} else {
gint t;
for (t = 0; t < tag_fields->len; t++) {
tag_str = g_array_index (tag_fields, gchar *, t);
if (tag_str != NULL && tag_str[0] != '\0')
result |= id3v2_tag_to_taglist (work, tag_name, tag_str);
}
}
free_tag_strings (tag_fields);
}
g_free (uu_data);
return result;
}
static gboolean
parse_comment_frame (ID3TagsWorking * work)
{
guint dummy;
guint8 encoding;
gchar language[4];
GArray *fields = NULL;
gchar *description, *text;
if (work->parse_size < 6)
return FALSE;
encoding = work->parse_data[0];
language[0] = g_ascii_tolower (work->parse_data[1]);
language[1] = g_ascii_tolower (work->parse_data[2]);
language[2] = g_ascii_tolower (work->parse_data[3]);
language[3] = '\0';
parse_split_strings (encoding, (gchar *) work->parse_data + 4,
work->parse_size - 4, &fields);
if (fields == NULL || fields->len < 2) {
GST_WARNING ("Failed to decode comment frame");
goto fail;
}
description = g_array_index (fields, gchar *, 0);
text = g_array_index (fields, gchar *, 1);
if (!g_utf8_validate (text, -1, NULL)) {
GST_WARNING ("Converted string is not valid utf-8");
goto fail;
}
/* skip our own dummy descriptions (from id3v2mux) */
if (strlen (description) > 0 && g_utf8_validate (description, -1, NULL) &&
sscanf (description, "c%u", &dummy) != 1) {
gchar *s;
/* must be either an ISO-639-1 or ISO-639-2 language code */
if (language[0] != '\0' &&
g_ascii_isalpha (language[0]) &&
g_ascii_isalpha (language[1]) &&
(g_ascii_isalpha (language[2]) || language[2] == '\0')) {
s = g_strdup_printf ("%s[%s]=%s", description, language, text);
} else {
s = g_strdup_printf ("%s=%s", description, text);
}
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
GST_TAG_EXTENDED_COMMENT, s, NULL);
g_free (s);
} else if (text != NULL && *text != '\0') {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
GST_TAG_COMMENT, text, NULL);
} else {
goto fail;
}
free_tag_strings (fields);
return TRUE;
fail:
{
GST_WARNING ("failed to parse COMM frame");
free_tag_strings (fields);
return FALSE;
}
}
static GArray *
parse_text_identification_frame (ID3TagsWorking * work)
{
guchar encoding;
GArray *fields = NULL;
if (work->parse_size < 2)
return NULL;
encoding = work->parse_data[0];
parse_split_strings (encoding, (gchar *) work->parse_data + 1,
work->parse_size - 1, &fields);
if (fields) {
if (fields->len > 0) {
GST_LOG ("Read %d fields from Text ID frame of size %d with encoding %d"
". First is '%s'", fields->len, work->parse_size - 1, encoding,
g_array_index (fields, gchar *, 0));
} else {
GST_LOG ("Read 0 fields from Text ID frame of size %d with encoding %d",
work->parse_size - 1, encoding);
}
}
return fields;
}
static gboolean
link_is_known_license (const gchar * url)
{
return g_str_has_prefix (url, "http://creativecommons.org/licenses/");
}
static gchar *
parse_url_link_frame (ID3TagsWorking * work, const gchar ** tag_name)
{
gsize len;
gchar *nul, *data, *link;
*tag_name = NULL;
if (work->parse_size == 0)
return NULL;
data = (gchar *) work->parse_data;
/* if there's more data then the string is long, we only want to parse the
* data up to the terminating zero to g_convert and ignore the rest, as
* per spec */
nul = memchr (data, '\0', work->parse_size);
if (nul != NULL) {
len = (gsize) (nul - data);
} else {
len = work->parse_size;
}
link = g_convert (data, len, "UTF-8", "ISO-8859-1", NULL, NULL, NULL);
if (link == NULL || !gst_uri_is_valid (link)) {
GST_DEBUG ("Invalid URI in %s frame: %s", work->frame_id,
GST_STR_NULL (link));
g_free (link);
return NULL;
}
/* we don't know if it's a link to a page that explains the copyright
* situation, or a link that points to/represents a license, the ID3 spec
* does not separate those two things; for now only put known license URIs
* into GST_TAG_LICENSE_URI and everything else into GST_TAG_COPYRIGHT_URI */
if (strcmp (work->frame_id, "WCOP") == 0) {
if (link_is_known_license (link))
*tag_name = GST_TAG_LICENSE_URI;
else
*tag_name = GST_TAG_COPYRIGHT_URI;
} else if (strcmp (work->frame_id, "WOAF") == 0) {
/* can't be bothered to create a CONTACT_URI tag for this, so let's just
* put into into GST_TAG_CONTACT, which is where it ends up when reading
* the info from vorbis comments as well */
*tag_name = GST_TAG_CONTACT;
}
return link;
}
static gchar *
parse_user_text_identification_frame (ID3TagsWorking * work,
const gchar ** tag_name)
{
gchar *ret;
guchar encoding;
GArray *fields = NULL;
*tag_name = NULL;
if (work->parse_size < 2)
return NULL;
encoding = work->parse_data[0];
parse_split_strings (encoding, (gchar *) work->parse_data + 1,
work->parse_size - 1, &fields);
if (fields == NULL)
return NULL;
if (fields->len != 2) {
GST_WARNING ("Expected 2 fields in TXXX frame, but got %d", fields->len);
free_tag_strings (fields);
return NULL;
}
*tag_name =
gst_tag_from_id3_user_tag ("TXXX", g_array_index (fields, gchar *, 0));
GST_LOG ("TXXX frame of size %d. Mapped descriptor '%s' to GStreamer tag %s",
work->parse_size - 1, g_array_index (fields, gchar *, 0),
GST_STR_NULL (*tag_name));
if (*tag_name) {
ret = g_strdup (g_array_index (fields, gchar *, 1));
/* GST_LOG ("%s = %s", *tag_name, GST_STR_NULL (ret)); */
} else {
ret = NULL;
}
free_tag_strings (fields);
return ret;
}
static gboolean
parse_id_string (ID3TagsWorking * work, gchar ** p_str, gint * p_len,
gint * p_datalen)
{
gint len, datalen;
if (work->parse_size < 2)
return FALSE;
for (len = 0; len < work->parse_size - 1; ++len) {
if (work->parse_data[len] == '\0')
break;
}
datalen = work->parse_size - (len + 1);
if (len == 0 || datalen <= 0)
return FALSE;
*p_str = g_strndup ((gchar *) work->parse_data, len);
*p_len = len;
*p_datalen = datalen;
return TRUE;
}
static gchar *
parse_unique_file_identifier (ID3TagsWorking * work, const gchar ** tag_name)
{
gint len, datalen;
gchar *owner_id, *data, *ret = NULL;
GST_LOG ("parsing UFID frame of size %d", work->parse_size);
if (!parse_id_string (work, &owner_id, &len, &datalen))
return NULL;
data = (gchar *) work->parse_data + len + 1;
GST_LOG ("UFID owner ID: %s (+ %d bytes of data)", owner_id, datalen);
if (strcmp (owner_id, "http://musicbrainz.org") == 0 &&
g_utf8_validate (data, datalen, NULL)) {
*tag_name = GST_TAG_MUSICBRAINZ_TRACKID;
ret = g_strndup (data, datalen);
} else {
GST_INFO ("Unknown UFID owner ID: %s", owner_id);
}
g_free (owner_id);
return ret;
}
/* parse data and return length of the next string in the given encoding,
* including the NUL terminator */
static gint
scan_encoded_string (guint8 encoding, gchar * data, gint data_size)
{
gint i;
switch (encoding) {
case ID3V2_ENCODING_ISO8859:
case ID3V2_ENCODING_UTF8:
for (i = 0; i < data_size; ++i) {
if (data[i] == '\0')
return i + 1;
}
break;
case ID3V2_ENCODING_UTF16:
case ID3V2_ENCODING_UTF16BE:
/* we don't care about BOMs here and treat them as part of the string */
/* Find '\0\0' terminator */
for (i = 0; i < data_size - 1; i += 2) {
if (data[i] == '\0' && data[i + 1] == '\0')
return i + 2;
}
break;
default:
break;
}
return 0;
}
static gboolean
parse_picture_frame (ID3TagsWorking * work)
{
guint8 txt_encoding, pic_type;
gchar *mime_str = NULL;
gint len, datalen;
GST_LOG ("APIC frame (ID3v2.%u)", ID3V2_VER_MAJOR (work->hdr.version));
if (work->parse_size < 1 + 1 + 1 + 1 + 1)
goto not_enough_data;
txt_encoding = work->parse_data[0];
++work->parse_data;
--work->parse_size;
/* Read image format; in early ID3v2 versions this is a fixed-length
* 3-character string without terminator; in later versions (>= 2.3.0)
* this is a NUL-terminated string of variable length */
if (ID3V2_VER_MAJOR (work->hdr.version) < 3) {
if (work->parse_size < 3)
goto not_enough_data;
mime_str = g_strndup ((gchar *) work->parse_data, 3);
len = 3;
} else {
if (!parse_id_string (work, &mime_str, &len, &datalen))
return FALSE;
++len; /* for string terminator */
}
if (work->parse_size < len + 1 + 1 + 1)
goto not_enough_data;
work->parse_data += len;
work->parse_size -= len;
/* Read image type */
pic_type = work->parse_data[0];
++work->parse_data;
--work->parse_size;
GST_LOG ("APIC frame mime type : %s", GST_STR_NULL (mime_str));
GST_LOG ("APIC frame picture type : 0x%02x", (guint) pic_type);
if (work->parse_size < 1 + 1)
goto not_enough_data;
len = scan_encoded_string (txt_encoding, (gchar *) work->parse_data,
work->parse_size);
if (len < 1)
goto error;
/* just skip the description string ... */
GST_LOG ("Skipping description string (%d bytes in original coding)", len);
if (work->parse_size < len + 1)
goto not_enough_data;
work->parse_data += len;
work->parse_size -= len;
GST_DEBUG ("image data is %u bytes", work->parse_size);
if (work->parse_size <= 0)
goto not_enough_data;
if (!gst_tag_list_add_id3_image (work->tags, (guint8 *) work->parse_data,
work->parse_size, pic_type)) {
goto error;
}
g_free (mime_str);
return TRUE;
not_enough_data:
{
GST_DEBUG ("not enough data, skipping APIC frame");
/* fall through to error */
}
error:
{
GST_DEBUG ("problem parsing APIC frame, skipping");
g_free (mime_str);
return FALSE;
}
}
#define ID3V2_RVA2_CHANNEL_MASTER 1
static gboolean
parse_relative_volume_adjustment_two (ID3TagsWorking * work)
{
const gchar *gain_tag_name = NULL;
const gchar *peak_tag_name = NULL;
gdouble gain_dB, peak_val;
guint64 peak;
guint8 *data, chan, peak_bits;
gchar *id;
gint len, datalen, i;
if (!parse_id_string (work, &id, &len, &datalen))
return FALSE;
if (datalen < (1 + 2 + 1)) {
GST_WARNING ("broken RVA2 frame, data size only %d bytes", datalen);
g_free (id);
return FALSE;
}
data = work->parse_data + len + 1;
chan = GST_READ_UINT8 (data);
gain_dB = (gdouble) ((gint16) GST_READ_UINT16_BE (data + 1)) / 512.0;
/* The meaning of the peak value is not defined in the ID3v2 spec. However,
* the first/only implementation of this seems to have been in XMMS, and
* other libs (like mutagen) seem to follow that implementation as well:
* see http://bugs.xmms.org/attachment.cgi?id=113&action=view */
peak_bits = GST_READ_UINT8 (data + 1 + 2);
if (peak_bits > 64) {
GST_WARNING ("silly peak precision of %d bits, ignoring", (gint) peak_bits);
peak_bits = 0;
}
data += 1 + 2 + 1;
datalen -= 1 + 2 + 1;
if (peak_bits == 16) {
peak = GST_READ_UINT16_BE (data);
} else {
peak = 0;
for (i = 0; i < (GST_ROUND_UP_8 (peak_bits) / 8) && datalen > 0; ++i) {
peak = peak << 8;
peak |= GST_READ_UINT8 (data);
++data;
--datalen;
}
}
peak = peak << (64 - GST_ROUND_UP_8 (peak_bits));
peak_val =
gst_guint64_to_gdouble (peak) / gst_util_guint64_to_gdouble (G_MAXINT64);
GST_LOG ("RVA2 frame: id=%s, chan=%u, adj=%.2fdB, peak_bits=%u, peak=%.2f",
id, chan, gain_dB, (guint) peak_bits, peak_val);
if (chan == ID3V2_RVA2_CHANNEL_MASTER && strcmp (id, "track") == 0) {
gain_tag_name = GST_TAG_TRACK_GAIN;
peak_tag_name = GST_TAG_TRACK_PEAK;
} else if (chan == ID3V2_RVA2_CHANNEL_MASTER && strcmp (id, "album") == 0) {
gain_tag_name = GST_TAG_ALBUM_GAIN;
peak_tag_name = GST_TAG_ALBUM_PEAK;
} else {
GST_INFO ("Unhandled RVA2 frame id '%s' for channel %d", id, chan);
}
if (gain_tag_name) {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
gain_tag_name, gain_dB, NULL);
}
if (peak_tag_name && peak_bits > 0) {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
peak_tag_name, peak_val, NULL);
}
g_free (id);
return (gain_tag_name != NULL || peak_tag_name != NULL);
}
static void
parse_obsolete_tdat_frame (ID3TagsWorking * work)
{
if (work->parse_size >= 5 &&
work->parse_data[0] == ID3V2_ENCODING_ISO8859 &&
g_ascii_isdigit (work->parse_data[1]) &&
g_ascii_isdigit (work->parse_data[2]) &&
g_ascii_isdigit (work->parse_data[3]) &&
g_ascii_isdigit (work->parse_data[4])) {
work->pending_day = (10 * g_ascii_digit_value (work->parse_data[1])) +
g_ascii_digit_value (work->parse_data[2]);
work->pending_month = (10 * g_ascii_digit_value (work->parse_data[3])) +
g_ascii_digit_value (work->parse_data[4]);
GST_LOG ("date (dd/mm) %02u/%02u", work->pending_day, work->pending_month);
}
}
static gboolean
id3v2_tag_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
const gchar * tag_str)
{
GType tag_type = gst_tag_get_type (tag_name);
GstTagList *tag_list = work->tags;
if (tag_str == NULL)
return FALSE;
switch (tag_type) {
case G_TYPE_UINT:
{
gint current, total;
if (sscanf (tag_str, "%d/%d", &current, &total) == 2) {
if (total <= 0) {
GST_WARNING ("Ignoring invalid value for total %d in tag %s",
total, tag_name);
} else {
if (strcmp (tag_name, GST_TAG_TRACK_NUMBER) == 0) {
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_TRACK_COUNT, total, NULL);
} else if (strcmp (tag_name, GST_TAG_ALBUM_VOLUME_NUMBER) == 0) {
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_ALBUM_VOLUME_COUNT, total, NULL);
}
}
} else if (sscanf (tag_str, "%d", &current) != 1) {
/* Not an integer in the string */
GST_WARNING ("Tag string for tag %s does not contain an integer - "
"ignoring", tag_name);
break;
}
if (current <= 0) {
GST_WARNING ("Ignoring invalid value %d in tag %s", current, tag_name);
} else {
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND, tag_name, current,
NULL);
}
break;
}
case G_TYPE_UINT64:
{
guint64 tmp;
g_assert (strcmp (tag_name, GST_TAG_DURATION) == 0);
tmp = strtoul (tag_str, NULL, 10);
if (tmp == 0) {
break;
}
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_DURATION, tmp * 1000 * 1000, NULL);
break;
}
case G_TYPE_STRING:{
const GValue *val;
guint i, num;
/* make sure we add each unique string only once per tag, we don't want
* to have the same genre in the genre list multiple times, for example,
* or the same DiscID in there twice just because it's contained in the
* tag multiple times under different TXXX user tags */
num = gst_tag_list_get_tag_size (tag_list, tag_name);
for (i = 0; i < num; ++i) {
val = gst_tag_list_get_value_index (tag_list, tag_name, i);
if (val != NULL && strcmp (g_value_get_string (val), tag_str) == 0)
break;
}
if (i == num) {
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
tag_name, tag_str, NULL);
}
break;
}
default:{
gchar *tmp = NULL;
GValue src = { 0, };
GValue dest = { 0, };
/* Ensure that any date string is complete */
if (tag_type == GST_TYPE_DATE) {
guint year = 1901, month = 1, day = 1;
/* Dates can be yyyy-MM-dd, yyyy-MM or yyyy, but we need
* the first type */
if (sscanf (tag_str, "%04u-%02u-%02u", &year, &month, &day) == 0)
break;
tmp = g_strdup_printf ("%04u-%02u-%02u", year, month, day);
tag_str = tmp;
}
/* handles anything else */
g_value_init (&src, G_TYPE_STRING);
g_value_set_string (&src, (const gchar *) tag_str);
g_value_init (&dest, tag_type);
if (g_value_transform (&src, &dest)) {
gst_tag_list_add_values (tag_list, GST_TAG_MERGE_APPEND,
tag_name, &dest, NULL);
} else if (tag_type == G_TYPE_DOUBLE) {
/* replaygain tags in TXXX frames ... */
g_value_set_double (&dest, g_strtod (tag_str, NULL));
gst_tag_list_add_values (tag_list, GST_TAG_MERGE_KEEP,
tag_name, &dest, NULL);
GST_LOG ("Converted string '%s' to double %f", tag_str,
g_value_get_double (&dest));
} else {
GST_WARNING ("Failed to transform tag from string to type '%s'",
g_type_name (tag_type));
}
g_value_unset (&src);
g_value_unset (&dest);
g_free (tmp);
break;
}
}
return TRUE;
}
/* Check that an array of characters contains only digits */
static gboolean
id3v2_are_digits (const gchar * chars, gint size)
{
gint i;
for (i = 0; i < size; i++) {
if (!g_ascii_isdigit (chars[i]))
return FALSE;
}
return TRUE;
}
static gboolean
id3v2_genre_string_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
const gchar * tag_str, gint len)
{
g_return_val_if_fail (tag_str != NULL, FALSE);
/* If it's a number, it might be a defined genre */
if (id3v2_are_digits (tag_str, len)) {
tag_str = gst_tag_id3_genre_get (strtol (tag_str, NULL, 10));
return id3v2_tag_to_taglist (work, tag_name, tag_str);
}
/* Otherwise it might be "RX" or "CR" */
if (len == 2) {
if (g_ascii_strncasecmp ("rx", tag_str, len) == 0)
return id3v2_tag_to_taglist (work, tag_name, "Remix");
if (g_ascii_strncasecmp ("cr", tag_str, len) == 0)
return id3v2_tag_to_taglist (work, tag_name, "Cover");
}
/* Otherwise it's a string */
return id3v2_tag_to_taglist (work, tag_name, tag_str);
}
static gboolean
id3v2_genre_fields_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
GArray * tag_fields)
{
gchar *tag_str = NULL;
gboolean result = FALSE;
gint i;
for (i = 0; i < tag_fields->len; i++) {
gint len;
tag_str = g_array_index (tag_fields, gchar *, 0);
if (tag_str == NULL)
continue;
len = strlen (tag_str);
/* Only supposed to see '(n)' type numeric genre strings in ID3 <= 2.3.0
* but apparently we see them in 2.4.0 sometimes too */
if (TRUE || work->hdr.version <= 0x300) { /* <= 2.3.0 */
/* Check for genre numbers wrapped in parentheses, possibly
* followed by a string */
while (len >= 2) {
gint pos;
gboolean found = FALSE;
/* Double parenthesis ends the numeric genres, but we need
* to swallow the first one so we actually output '(' */
if (tag_str[0] == '(' && tag_str[1] == '(') {
tag_str++;
len--;
break;
}
/* If the first char is not a parenthesis, then stop
* looking for parenthesised genre strings */
if (tag_str[0] != '(')
break;
for (pos = 1; pos < len; pos++) {
if (tag_str[pos] == ')') {
gchar *tmp_str;
tmp_str = g_strndup (tag_str + 1, pos - 1);
result |=
id3v2_genre_string_to_taglist (work, tag_name, tmp_str,
pos - 1);
g_free (tmp_str);
tag_str += pos + 1;
len -= pos + 1;
found = TRUE;
break;
}
/* If we encounter a non-digit while searching for a closing
* parenthesis, we should not try and interpret this as a
* numeric genre string */
if (!g_ascii_isdigit (tag_str[pos]))
break;
}
if (!found)
break; /* There was no closing parenthesis */
}
}
if (len > 0 && tag_str != NULL)
result |= id3v2_genre_string_to_taglist (work, tag_name, tag_str, len);
}
return result;
}
static const gchar utf16enc[] = "UTF-16";
static const gchar utf16leenc[] = "UTF-16LE";
static const gchar utf16beenc[] = "UTF-16BE";
static gboolean
find_utf16_bom (gchar * data, const gchar ** p_in_encoding)
{
guint16 marker = (GST_READ_UINT8 (data) << 8) | GST_READ_UINT8 (data + 1);
switch (marker) {
case 0xFFFE:
*p_in_encoding = utf16leenc;
return TRUE;
case 0xFEFF:
*p_in_encoding = utf16beenc;
return TRUE;
default:
break;
}
return FALSE;
}
static void
parse_insert_string_field (guint8 encoding, gchar * data, gint data_size,
GArray * fields)
{
gchar *field = NULL;
switch (encoding) {
case ID3V2_ENCODING_UTF16:
case ID3V2_ENCODING_UTF16BE:
{
const gchar *in_encode;
if (encoding == ID3V2_ENCODING_UTF16)
in_encode = utf16enc;
else
in_encode = utf16beenc;
/* Sometimes we see strings with multiple BOM markers at the start.
* In that case, we assume the innermost one is correct. If that fails
* to produce valid UTF-8, we try the other endianness anyway */
while (data_size > 2 && find_utf16_bom (data, &in_encode)) {
data += 2; /* skip BOM */
data_size -= 2;
}
field = g_convert (data, data_size, "UTF-8", in_encode, NULL, NULL, NULL);
if (field == NULL || g_utf8_validate (field, -1, NULL) == FALSE) {
/* As a fallback, try interpreting UTF-16 in the other endianness */
if (in_encode == utf16beenc)
field = g_convert (data, data_size, "UTF-8", utf16leenc,
NULL, NULL, NULL);
}
}
break;
case ID3V2_ENCODING_ISO8859:
if (g_utf8_validate (data, data_size, NULL))
field = g_strndup (data, data_size);
else
field = g_convert (data, data_size, "UTF-8", "ISO-8859-1",
NULL, NULL, NULL);
break;
default:
field = g_strndup (data, data_size);
break;
}
if (field) {
if (g_utf8_validate (field, -1, NULL)) {
g_array_append_val (fields, field);
return;
}
GST_DEBUG ("%s was bad UTF-8 after conversion from encoding %d. Ignoring",
field, encoding);
g_free (field);
}
}
static void
parse_split_strings (guint8 encoding, gchar * data, gint data_size,
GArray ** out_fields)
{
GArray *fields = g_array_new (FALSE, TRUE, sizeof (gchar *));
gint text_pos;
gint prev = 0;
g_return_if_fail (out_fields != NULL);
switch (encoding) {
case ID3V2_ENCODING_ISO8859:
for (text_pos = 0; text_pos < data_size; text_pos++) {
if (data[text_pos] == 0) {
parse_insert_string_field (encoding, data + prev,
text_pos - prev + 1, fields);
prev = text_pos + 1;
}
}
if (data_size - prev > 0 && data[prev] != 0x00) {
parse_insert_string_field (encoding, data + prev,
data_size - prev, fields);
}
break;
case ID3V2_ENCODING_UTF8:
for (prev = 0, text_pos = 0; text_pos < data_size; text_pos++) {
if (data[text_pos] == '\0') {
parse_insert_string_field (encoding, data + prev,
text_pos - prev + 1, fields);
prev = text_pos + 1;
}
}
if (data_size - prev > 0 && data[prev] != 0x00) {
parse_insert_string_field (encoding, data + prev,
data_size - prev, fields);
}
break;
case ID3V2_ENCODING_UTF16:
case ID3V2_ENCODING_UTF16BE:
{
/* Find '\0\0' terminator */
for (text_pos = 0; text_pos < data_size - 1; text_pos += 2) {
if (data[text_pos] == '\0' && data[text_pos + 1] == '\0') {
/* found a delimiter */
parse_insert_string_field (encoding, data + prev,
text_pos - prev + 2, fields);
text_pos++; /* Advance to the 2nd NULL terminator */
prev = text_pos + 1;
break;
}
}
if (data_size - prev > 1 &&
(data[prev] != 0x00 || data[prev + 1] != 0x00)) {
/* There were 2 or more non-null chars left, convert those too */
parse_insert_string_field (encoding, data + prev,
data_size - prev, fields);
}
break;
}
}
if (fields->len > 0)
*out_fields = fields;
else
g_array_free (fields, TRUE);
}
static void
free_tag_strings (GArray * fields)
{
if (fields) {
gint i;
gchar *c;
for (i = 0; i < fields->len; i++) {
c = g_array_index (fields, gchar *, i);
g_free (c);
}
g_array_free (fields, TRUE);
}
}
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