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gstreamer/gst/id3demux/id3v2frames.c
Tim-Philipp Müller 8acd6050ef gst/id3demux/id3v2frames.c: Extract images from ID3v2 tags (APIC frames). Fixes #339704. 
Original commit message from CVS:
* gst/id3demux/id3v2frames.c: (id3demux_id3v2_parse_frame),
(scan_encoded_string), (parse_picture_frame):
Extract images from ID3v2 tags (APIC frames). Fixes #339704.
* configure.ac:
Require core >= 0.10.8 (for GST_TAG_IMAGE and
GST_TAG_PPEVIEW_IMAGE used in the patch above).
2006-06-11 19:31:10 +00:00

990 lines
28 KiB
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/* -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
/* Copyright 2006 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 gchar *parse_comment_frame (ID3TagsWorking * work);
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 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
extern guint read_synch_uint (guint8 * data, guint size);
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;
/* 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 */
if (work->frame_flags & ID3V2_FRAME_FORMAT_ENCRYPTION) {
GST_WARNING ("Encrypted frames are not supported");
return FALSE;
}
if (work->frame_flags & ID3V2_FRAME_FORMAT_UNSYNCHRONISATION) {
GST_WARNING ("ID3v2 frame with unsupported unsynchronisation applied. "
"May fail badly");
}
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, "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;
}
}
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;
work->parse_data = g_malloc (work->parse_size);
g_return_val_if_fail (work->parse_data != NULL, FALSE);
dest = (Bytef *) work->parse_data;
src = (Bytef *) frame_data;
if (uncompress (dest, &destSize, src, frame_data_size) != Z_OK) {
g_free (work->parse_data);
return FALSE;
}
if (destSize != work->parse_size) {
GST_WARNING
("Decompressing ID3v2 frame %s did not produce expected size %d bytes (got %d)",
tag_name, work->parse_data, destSize);
return FALSE;
}
#else
GST_WARNING ("Compressed ID3v2 tag frame could not be decompressed"
" because gstid3demux was compiled without zlib support");
return FALSE;
#endif
} else {
work->parse_data = frame_data;
}
if (work->frame_id[0] == 'T') {
if (strcmp (work->frame_id, "TXXX") != 0) {
/* Text identification frame */
tag_fields = parse_text_identification_frame (work);
} else {
/* Handle user text frame */
tag_str = parse_user_text_identification_frame (work, &tag_name);
}
} else if (!strcmp (work->frame_id, "COMM")) {
/* Comment */
tag_str = 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);
}
if (work->frame_flags & ID3V2_FRAME_FORMAT_COMPRESSION)
g_free (work->parse_data);
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);
}
return result;
}
static gchar *
parse_comment_frame (ID3TagsWorking * work)
{
guint8 encoding;
gchar language[4];
GArray *fields = NULL;
gchar *out_str = NULL;
gchar *description, *text;
if (work->parse_size < 6)
return NULL;
encoding = work->parse_data[0];
language[0] = work->parse_data[1];
language[1] = work->parse_data[2];
language[2] = 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;
} else {
if (strlen (description) > 0 && g_utf8_validate (description, -1, NULL)) {
out_str = g_strdup_printf ("Description: %s\nComment: %s",
description, text);
} else {
out_str = g_strdup (text);
}
}
fail:
free_tag_strings (fields);
return out_str;
}
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. First is '%s'",
fields->len, work->parse_size - 1,
g_array_index (fields, gchar *, 0));
} else {
GST_LOG ("Read %d fields from Text ID frame of size %d", fields->len,
work->parse_size - 1);
}
}
return fields;
}
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)
{
GstBuffer *image = NULL;
GstCaps *image_caps = NULL;
gboolean is_pic_uri = FALSE;
guint8 txt_encoding, pic_type;
gchar *mime_str = NULL;
gint len, datalen;
GST_LOG ("APIC frame");
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;
if (!parse_id_string (work, &mime_str, &len, &datalen)) {
return FALSE;
}
is_pic_uri = (mime_str != NULL && strcmp (mime_str, "-->") == 0);
if (mime_str && *mime_str && strchr (mime_str, '/') == NULL && !is_pic_uri) {
gchar *tmp;
tmp = g_strdup_printf ("image/%s", mime_str);
g_free (mime_str);
mime_str = tmp;
}
if (work->parse_size < (len + 1) + 1 + 1 + 1)
goto not_enough_data;
work->parse_data += (len + 1);
work->parse_size -= (len + 1);
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 (is_pic_uri) {
gchar *uri;
uri = g_strndup ((gchar *) work->parse_data, work->parse_size);
GST_DEBUG ("image URI: %s", uri);
image = gst_buffer_new ();
GST_BUFFER_MALLOCDATA (image) = (guint8 *) uri; /* take ownership */
GST_BUFFER_DATA (image) = (guint8 *) uri;
GST_BUFFER_SIZE (image) = work->parse_size;
image_caps = gst_caps_new_simple ("text/uri-list", NULL);
} else {
image = gst_buffer_new_and_alloc (work->parse_size);
memcpy (GST_BUFFER_DATA (image), work->parse_data, work->parse_size);
/* if possible use GStreamer media type rather than declared type */
image_caps = gst_type_find_helper_for_buffer (NULL, image, NULL);
if (image_caps) {
GST_DEBUG ("Found GStreamer media type: %" GST_PTR_FORMAT, image_caps);
} else if (mime_str && *mime_str) {
GST_DEBUG ("No GStreamer media type found, using declared type");
image_caps = gst_caps_new_simple (mime_str, NULL);
} else {
GST_DEBUG ("Empty declared mime type, ignoring image frame");
image = NULL;
image_caps = NULL;
goto error;
}
}
if (image && image_caps) {
/* FIXME: use an enum here, declare in -base/gst-libs/gst/tag/? */
/* gst_structure_set (gst_caps_get_structure (image_caps, 0),
"id3-picture-type", G_TYPE_INT, (gint) pic_type, NULL); */
gst_buffer_set_caps (image, image_caps);
gst_caps_unref (image_caps);
if (pic_type == 0x01 || pic_type == 0x02) {
/* file icon of some sort */
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
GST_TAG_PREVIEW_IMAGE, image, NULL);
} else {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
GST_TAG_IMAGE, image, NULL);
}
gst_buffer_unref (image);
}
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 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:{
if (!strcmp (tag_name, GST_TAG_GENRE)) {
if (work->prev_genre && !strcmp (tag_str, work->prev_genre))
break; /* Same as the last genre */
g_free (work->prev_genre);
work->prev_genre = g_strdup (tag_str);
}
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:
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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