1 /* -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
2 /* Copyright 2005 Jan Schmidt <thaytan@mad.scientist.com>
3 * Copyright 2002,2003 Scott Wheeler <wheeler@kde.org> (portions from taglib)
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
26 #include <gst/tag/tag.h>
30 GST_DEBUG_CATEGORY_EXTERN (id3demux_debug);
31 #define GST_CAT_DEFAULT (id3demux_debug)
33 #define HANDLE_INVALID_SYNCSAFE
35 id3demux_id3v2_frames_to_tag_list (ID3TagsWorking * work, guint size);
38 read_synch_uint (const guint8 * data, guint size)
47 for (i = 0; i <= size; i++) {
48 invalid |= data[i] & 0x80;
49 result |= (data[i] & 0x7f) << ((size - i) * 7);
52 #ifdef HANDLE_INVALID_SYNCSAFE
54 GST_WARNING ("Invalid synch-safe integer in ID3v2 frame "
55 "- using the actual value instead");
57 for (i = 0; i <= size; i++) {
58 result |= data[i] << ((size - i) * 8);
66 id3demux_calc_id3v2_tag_size (GstBuffer * buf)
71 g_assert (buf != NULL);
72 g_assert (GST_BUFFER_SIZE (buf) >= ID3V2_HDR_SIZE);
74 data = GST_BUFFER_DATA (buf);
76 /* Check for 'ID3' string at start of buffer */
77 if (data[0] != 'I' || data[1] != 'D' || data[2] != '3') {
78 GST_DEBUG ("No ID3v2 tag in data");
85 /* Read the size from the header */
86 size = read_synch_uint (data + 6, 4);
88 return ID3V2_HDR_SIZE;
90 size += ID3V2_HDR_SIZE;
92 /* Expand the read size to include a footer if there is one */
93 if ((flags & ID3V2_HDR_FLAG_FOOTER))
96 GST_DEBUG ("ID3v2 tag, size: %u bytes", size);
101 id3demux_ununsync_data (const guint8 * unsync_data, guint32 * size)
107 uu = out = g_malloc (*size);
109 for (end = unsync_data + *size; unsync_data < end - 1; ++unsync_data, ++uu) {
111 if (G_UNLIKELY (*unsync_data == 0xff && *(unsync_data + 1) == 0x00))
115 /* take care of last byte (if last two bytes weren't 0xff 0x00) */
116 if (unsync_data < end) {
122 GST_DEBUG ("size after un-unsyncing: %u (before: %u)", out_size, *size);
128 /* caller must pass buffer with full ID3 tag */
130 id3demux_read_id3v2_tag (GstBuffer * buffer, guint * id3v2_size,
133 guint8 *data, *uu_data = NULL;
137 ID3TagsResult result;
140 read_size = id3demux_calc_id3v2_tag_size (buffer);
143 *id3v2_size = read_size;
145 /* Ignore tag if it has no frames attached, but skip the header then */
146 if (read_size <= ID3V2_HDR_SIZE)
147 return ID3TAGS_BROKEN_TAG;
149 data = GST_BUFFER_DATA (buffer);
151 /* Read the version */
152 version = GST_READ_UINT16_BE (data + 3);
157 /* Validate the version. At the moment, we only support up to 2.4.0 */
158 if (ID3V2_VER_MAJOR (version) > 4 || ID3V2_VER_MINOR (version) > 0) {
159 GST_WARNING ("ID3v2 tag is from revision 2.%d.%d, "
160 "but decoder only supports 2.%d.%d. Ignoring as per spec.",
161 version >> 8, version & 0xff, ID3V2_VERSION >> 8, ID3V2_VERSION & 0xff);
162 return ID3TAGS_BROKEN_TAG;
165 GST_DEBUG ("ID3v2 header flags: %s %s %s %s",
166 (flags & ID3V2_HDR_FLAG_UNSYNC) ? "UNSYNC" : "",
167 (flags & ID3V2_HDR_FLAG_EXTHDR) ? "EXTENDED_HEADER" : "",
168 (flags & ID3V2_HDR_FLAG_EXPERIMENTAL) ? "EXPERIMENTAL" : "",
169 (flags & ID3V2_HDR_FLAG_FOOTER) ? "FOOTER" : "");
171 /* This shouldn't really happen! Caller should have checked first */
172 if (GST_BUFFER_SIZE (buffer) < read_size) {
174 ("Found ID3v2 tag with revision 2.%d.%d - need %u more bytes to read",
175 version >> 8, version & 0xff,
176 (guint) (read_size - GST_BUFFER_SIZE (buffer)));
177 return ID3TAGS_MORE_DATA; /* Need more data to decode with */
180 GST_DEBUG ("Reading ID3v2 tag with revision 2.%d.%d of size %u", version >> 8,
181 version & 0xff, read_size);
183 g_return_val_if_fail (tags != NULL, ID3TAGS_READ_TAG);
185 GST_MEMDUMP ("ID3v2 tag", GST_BUFFER_DATA (buffer), read_size);
187 memset (&work, 0, sizeof (ID3TagsWorking));
188 work.buffer = buffer;
189 work.hdr.version = version;
190 work.hdr.size = read_size;
191 work.hdr.flags = flags;
192 work.hdr.frame_data = GST_BUFFER_DATA (buffer) + ID3V2_HDR_SIZE;
193 if (flags & ID3V2_HDR_FLAG_FOOTER)
194 work.hdr.frame_data_size = read_size - ID3V2_HDR_SIZE - 10;
196 work.hdr.frame_data_size = read_size - ID3V2_HDR_SIZE;
198 /* in v2.3 the frame sizes are not syncsafe, so the entire tag had to be
199 * unsynced. In v2.4 the frame sizes are syncsafe so it's just the frame
200 * data that needs un-unsyncing, but not the frame headers. */
201 if ((flags & ID3V2_HDR_FLAG_UNSYNC) != 0 && ID3V2_VER_MAJOR (version) <= 3) {
202 GST_DEBUG ("Un-unsyncing entire tag");
203 uu_data = id3demux_ununsync_data (work.hdr.frame_data,
204 &work.hdr.frame_data_size);
205 work.hdr.frame_data = uu_data;
206 GST_MEMDUMP ("ID3v2 tag (un-unsyced)", uu_data, work.hdr.frame_data_size);
209 result = id3demux_id3v2_frames_to_tag_list (&work, work.hdr.frame_data_size);
219 id3demux_id3v2_frame_hdr_size (guint id3v2ver)
221 /* ID3v2 < 2.3.0 only had 6 byte header */
222 switch (ID3V2_VER_MAJOR (id3v2ver)) {
234 static const gchar *obsolete_frame_ids[] = {
235 "CRM", "EQU", "LNK", "RVA", "TIM", "TSI", /* From 2.2 */
236 "EQUA", "RVAD", "TIME", "TRDA", "TSIZ", /* From 2.3 */
240 const struct ID3v2FrameIDConvert
244 } frame_id_conversions[] = {
270 "TDA", "TDAT"}, { /* obsolete, but we need to parse it anyway */
312 convert_fid_to_v240 (gchar * frame_id)
316 while (obsolete_frame_ids[i] != NULL) {
317 if (strncmp (frame_id, obsolete_frame_ids[i], 5) == 0)
323 while (frame_id_conversions[i].orig != NULL) {
324 if (strncmp (frame_id, frame_id_conversions[i].orig, 5) == 0) {
325 strcpy (frame_id, frame_id_conversions[i].new);
334 /* add unknown or unhandled ID3v2 frames to the taglist as binary blobs */
336 id3demux_add_id3v2_frame_blob_to_taglist (ID3TagsWorking * work, guint size)
342 guint frame_size, header_size;
345 switch (ID3V2_VER_MAJOR (work->hdr.version)) {
352 header_size = 4 + 4 + 2;
355 g_return_if_reached ();
358 frame_data = work->hdr.frame_data - header_size;
359 frame_size = size + header_size;
361 blob = gst_buffer_new_and_alloc (frame_size);
362 memcpy (GST_BUFFER_DATA (blob), frame_data, frame_size);
364 /* Sanitize frame id */
365 for (i = 0; i < 4; i++) {
366 if (!g_ascii_isalnum (frame_data[i]))
370 media_type = g_strdup_printf ("application/x-gst-id3v2-%c%c%c%c-frame",
371 g_ascii_tolower (frame_data[0]), g_ascii_tolower (frame_data[1]),
372 g_ascii_tolower (frame_data[2]), g_ascii_tolower (frame_data[3]));
373 caps = gst_caps_new_simple (media_type, "version", G_TYPE_INT,
374 (gint) ID3V2_VER_MAJOR (work->hdr.version), NULL);
375 gst_buffer_set_caps (blob, caps);
376 gst_caps_unref (caps);
379 /* gst_util_dump_mem (GST_BUFFER_DATA (blob), GST_BUFFER_SIZE (blob)); */
381 gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
382 GST_ID3_DEMUX_TAG_ID3V2_FRAME, blob, NULL);
383 gst_buffer_unref (blob);
387 id3demux_id3v2_frames_to_tag_list (ID3TagsWorking * work, guint size)
389 guint frame_hdr_size;
392 /* Extended header if present */
393 if (work->hdr.flags & ID3V2_HDR_FLAG_EXTHDR) {
394 work->hdr.ext_hdr_size = read_synch_uint (work->hdr.frame_data, 4);
395 if (work->hdr.ext_hdr_size < 6 ||
396 (work->hdr.ext_hdr_size) > work->hdr.frame_data_size) {
397 GST_DEBUG ("Invalid extended header. Broken tag");
398 return ID3TAGS_BROKEN_TAG;
400 work->hdr.ext_flag_bytes = work->hdr.frame_data[4];
401 if (5 + work->hdr.ext_flag_bytes > work->hdr.frame_data_size) {
403 ("Tag claims extended header, but doesn't have enough bytes. Broken tag");
404 return ID3TAGS_BROKEN_TAG;
407 work->hdr.ext_flag_data = work->hdr.frame_data + 5;
408 work->hdr.frame_data += work->hdr.ext_hdr_size;
409 work->hdr.frame_data_size -= work->hdr.ext_hdr_size;
412 start = GST_BUFFER_DATA (work->buffer);
413 frame_hdr_size = id3demux_id3v2_frame_hdr_size (work->hdr.version);
414 if (work->hdr.frame_data_size <= frame_hdr_size) {
415 GST_DEBUG ("Tag has no data frames. Broken tag");
416 return ID3TAGS_BROKEN_TAG; /* Must have at least one frame */
419 work->tags = gst_tag_list_new ();
420 g_return_val_if_fail (work->tags != NULL, ID3TAGS_READ_TAG);
422 while (work->hdr.frame_data_size > frame_hdr_size) {
423 guint frame_size = 0;
424 gchar frame_id[5] = "";
425 guint16 frame_flags = 0x0;
426 gboolean obsolete_id = FALSE;
427 gboolean read_synch_size = TRUE;
430 /* Read the header */
431 switch (ID3V2_VER_MAJOR (work->hdr.version)) {
435 frame_id[0] = work->hdr.frame_data[0];
436 frame_id[1] = work->hdr.frame_data[1];
437 frame_id[2] = work->hdr.frame_data[2];
440 obsolete_id = convert_fid_to_v240 (frame_id);
442 /* 3 byte non-synchsafe size */
443 frame_size = work->hdr.frame_data[3] << 16 |
444 work->hdr.frame_data[4] << 8 | work->hdr.frame_data[5];
448 read_synch_size = FALSE; /* 2.3 frame size is not synch-safe */
451 frame_id[0] = work->hdr.frame_data[0];
452 frame_id[1] = work->hdr.frame_data[1];
453 frame_id[2] = work->hdr.frame_data[2];
454 frame_id[3] = work->hdr.frame_data[3];
457 frame_size = read_synch_uint (work->hdr.frame_data + 4, 4);
459 frame_size = GST_READ_UINT32_BE (work->hdr.frame_data + 4);
461 frame_flags = GST_READ_UINT16_BE (work->hdr.frame_data + 8);
463 if (ID3V2_VER_MAJOR (work->hdr.version) == 3) {
464 frame_flags &= ID3V2_3_FRAME_FLAGS_MASK;
465 obsolete_id = convert_fid_to_v240 (frame_id);
467 GST_DEBUG ("Ignoring v2.3 frame %s", frame_id);
472 work->hdr.frame_data += frame_hdr_size;
473 work->hdr.frame_data_size -= frame_hdr_size;
475 if (frame_size > work->hdr.frame_data_size || strcmp (frame_id, "") == 0)
476 break; /* No more frames to read */
478 /* Sanitize frame id */
479 switch (ID3V2_VER_MAJOR (work->hdr.version)) {
483 for (i = 0; i < 3; i++) {
484 if (!g_ascii_isalnum (frame_id[i]))
489 for (i = 0; i < 4; i++) {
490 if (!g_ascii_isalnum (frame_id[i]))
496 ("Frame @ %ld (0x%02lx) id %s size %u, next=%ld (0x%02lx) obsolete=%d",
497 (glong) (work->hdr.frame_data - start),
498 (glong) (work->hdr.frame_data - start), frame_id, frame_size,
499 (glong) (work->hdr.frame_data + frame_hdr_size + frame_size - start),
500 (glong) (work->hdr.frame_data + frame_hdr_size + frame_size - start),
502 #define flag_string(flag,str) \
503 ((frame_flags & (flag)) ? (str) : "")
504 GST_LOG ("Frame header flags: 0x%04x %s %s %s %s %s %s %s", frame_flags,
505 flag_string (ID3V2_FRAME_STATUS_FRAME_ALTER_PRESERVE, "ALTER_PRESERVE"),
506 flag_string (ID3V2_FRAME_STATUS_READONLY, "READONLY"),
507 flag_string (ID3V2_FRAME_FORMAT_GROUPING_ID, "GROUPING_ID"),
508 flag_string (ID3V2_FRAME_FORMAT_COMPRESSION, "COMPRESSION"),
509 flag_string (ID3V2_FRAME_FORMAT_ENCRYPTION, "ENCRYPTION"),
510 flag_string (ID3V2_FRAME_FORMAT_UNSYNCHRONISATION, "UNSYNC"),
511 flag_string (ID3V2_FRAME_FORMAT_DATA_LENGTH_INDICATOR, "LENGTH_IND"));
516 /* Now, read, decompress etc the contents of the frame
517 * into a TagList entry */
518 work->cur_frame_size = frame_size;
519 work->frame_id = frame_id;
520 work->frame_flags = frame_flags;
522 if (id3demux_id3v2_parse_frame (work)) {
523 GST_LOG ("Extracted frame with id %s", frame_id);
525 GST_LOG ("Failed to extract frame with id %s", frame_id);
526 id3demux_add_id3v2_frame_blob_to_taglist (work, frame_size);
529 work->hdr.frame_data += frame_size;
530 work->hdr.frame_data_size -= frame_size;
533 if (gst_structure_n_fields (GST_STRUCTURE (work->tags)) == 0) {
534 GST_DEBUG ("Could not extract any frames from tag. Broken or empty tag");
535 gst_tag_list_free (work->tags);
537 return ID3TAGS_BROKEN_TAG;
540 /* Set day/month now if they were in a separate (obsolete) TDAT frame */
541 if (work->pending_day != 0 && work->pending_month != 0) {
544 if (gst_tag_list_get_date (work->tags, GST_TAG_DATE, &date)) {
545 g_date_set_day (date, work->pending_day);
546 g_date_set_month (date, work->pending_month);
547 gst_tag_list_add (work->tags, GST_TAG_MERGE_REPLACE, GST_TAG_DATE,
553 return ID3TAGS_READ_TAG;