2 * Copyright (C) 2009 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file wma_afh.c The audio format handler for WMA files. */
16 #include "portable_io.h"
21 #define FOR_EACH_FRAME(_f, _buf, _size, _ps) for (_f = (_buf); \
22 _f + (_ps) < (_buf) + (_size); \
26 * Must be called on a frame boundary, e.g. start + header_len.
27 * \return Frame count, superframe count via *num_superframes.
29 static int count_frames(const char *buf, int buf_size, uint32_t packet_size,
32 int fc = 0, sfc = 0; /* frame count, superframe count */
36 FOR_EACH_FRAME(p, (uint8_t *)buf, buf_size, packet_size) {
37 fc += p[WMA_FRAME_SKIP] & 0x0f;
40 PARA_INFO_LOG("%d frames, %d superframes\n", fc, sfc);
42 *num_superframes = sfc;
47 * put_utf8() and get_str16() below are based on macros in libavutil/common.h
48 * of the mplayer source code, copyright (c) 2006 Michael Niedermayer
53 * Convert a 32-bit Unicode character to its UTF-8 encoded form.
55 * Writes up to 4 bytes for values in the valid UTF-8 range and up to 7 bytes
56 * in the general case, depending on the length of the converted Unicode
59 * \param result Where the converted UTF-8 bytes are written.
61 static int put_utf8(uint32_t val, char *result)
71 bytes = (wma_log2(in) + 4) / 5;
72 shift = (bytes - 1) * 6;
73 *out++ = (256 - (256 >> bytes)) | (in >> shift);
76 *out++ = 0x80 | ((in >> shift) & 0x3f);
81 static char *get_str16(const char *in, int len)
84 int out_size = 0, out_len = 0;
90 if (out_len + 7 + 1 >= out_size) {
91 out_size = 2 * out_size + 50;
92 out = para_realloc(out, out_size);
96 out_len += put_utf8(x, out + out_len);
105 static const char content_description_header[] = {
106 0x33, 0x26, 0xb2, 0x75, 0x8E, 0x66, 0xCF, 0x11,
107 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
110 static const char extended_content_header[] = {
111 0x40, 0xA4, 0xD0, 0xD2, 0x07, 0xE3, 0xD2, 0x11,
112 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50
115 static const char year_tag_header[] = { /* WM/Year */
116 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x59, 0x00,
117 0x65, 0x00, 0x61, 0x00, 0x72, 0x00
120 static const char album_tag_header[] = { /* WM/AlbumTitle */
121 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x41, 0x00,
122 0x6c, 0x00, 0x62, 0x00, 0x75, 0x00, 0x6d, 0x00,
123 0x54, 0x00, 0x69, 0x00, 0x74, 0x00, 0x6c, 0x00,
127 static void read_asf_tags(const char *buf, int buf_size, struct taginfo *ti)
129 const char *p, *end = buf + buf_size, *q;
130 uint16_t len1, len2, len3, len4;
132 p = search_pattern(content_description_header,
133 sizeof(content_description_header), buf, buf_size);
134 if (!p || p + 34 >= end) {
135 PARA_NOTICE_LOG("content description header not found\n");
147 /* ignore length of the rating information */
151 ti->title = get_str16(p, len1);
155 ti->artist = get_str16(p, len2);
159 ti->comment = get_str16(p, len4);
161 p = search_pattern(extended_content_header, sizeof(extended_content_header),
164 PARA_NOTICE_LOG("extended content header not found\n");
167 q = search_pattern(year_tag_header, sizeof(year_tag_header),
170 const char *r = q + sizeof(year_tag_header) + 6;
172 ti->year = get_str16(r, end - r);
174 q = search_pattern(album_tag_header, sizeof(album_tag_header),
177 const char *r = q + sizeof(album_tag_header) + 6;
179 ti->album = get_str16(r, end - r);
183 static void set_chunk_tv(int frames_per_chunk, int frequency,
184 struct timeval *result)
186 uint64_t x = (uint64_t)frames_per_chunk * 2048 * 1000 * 1000
189 result->tv_sec = x / 1000 / 1000;
190 result->tv_usec = x % (1000 * 1000);
191 PARA_INFO_LOG("chunk time: %lums\n", tv2ms(result));
194 /* Must be called on a frame boundary. */
195 static int wma_make_chunk_table(char *buf, size_t buf_size, uint32_t packet_size,
196 struct afh_info *afhi)
198 const uint8_t *f, *start = (uint8_t *)buf;
199 int j, frames_per_chunk;
200 size_t ct_size = 250;
201 int ret, count = 0, num_frames, num_superframes;
203 afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
204 afhi->chunk_table[0] = 0;
205 afhi->chunk_table[1] = afhi->header_len;
207 num_frames = count_frames(buf, buf_size, packet_size,
210 if (num_frames == 0 || num_superframes == 0)
212 afhi->seconds_total = num_frames * 2048 /* FIXME */
214 frames_per_chunk = num_frames / num_superframes / 2;
215 PARA_INFO_LOG("%d frames per chunk\n", frames_per_chunk);
217 FOR_EACH_FRAME(f, start, buf_size, packet_size) {
218 count += f[WMA_FRAME_SKIP] & 0x0f;
219 while (count > j * frames_per_chunk) {
223 afhi->chunk_table = para_realloc(
225 ct_size * sizeof(uint32_t));
227 afhi->chunk_table[j] = f - start + afhi->header_len
231 afhi->chunks_total = j;
232 set_chunk_tv(frames_per_chunk, afhi->frequency, &afhi->chunk_tv);
235 free(afhi->chunk_table);
239 static int wma_get_file_info(char *map, size_t numbytes, __a_unused int fd,
240 struct afh_info *afhi)
243 struct asf_header_info ahi;
245 ret = read_asf_header(map, numbytes, &ahi);
250 afhi->bitrate = ahi.bit_rate / 1000;
251 if (ahi.sample_rate == 0)
253 afhi->frequency = ahi.sample_rate;
254 afhi->channels = ahi.channels;
255 afhi->header_len = ahi.header_len;
257 afhi->techinfo = make_message("%s%s%s%s%s",
258 ahi.use_exp_vlc? "exp vlc" : "",
259 (ahi.use_bit_reservoir && ahi.use_exp_vlc)? ", " : "",
260 ahi.use_bit_reservoir? "bit reservoir" : "",
261 (ahi.use_variable_block_len &&
262 (ahi.use_exp_vlc || ahi.use_bit_reservoir)? ", " : ""),
263 ahi.use_variable_block_len? "vbl" : ""
265 wma_make_chunk_table(map + ahi.header_len, numbytes - ahi.header_len,
266 ahi.packet_size, afhi);
267 read_asf_tags(map, ahi.header_len, &afhi->tags);
276 struct tag_object_nums {
277 int content_descr_obj_num;
278 int extended_content_descr_obj_num;
281 struct afs_top_level_header_object {
283 uint32_t num_objects;
284 uint8_t reserved1, reserved2;
285 struct asf_object *objects;
288 #define CHECK_HEADER(_p, _h) (memcmp((_p), (_h), sizeof((_h))) == 0)
290 static int read_asf_objects(const char *src, size_t size, uint32_t num_objects,
291 struct asf_object *objs, struct tag_object_nums *ton)
296 for (i = 0, p = src; i < num_objects; p += objs[i++].size) {
297 if (p + 24 > src + size)
299 objs[i].ptr = (char *)p;
300 objs[i].size = read_u64(p + 16);
301 if (p + objs[i].size > src + size)
304 if (CHECK_HEADER(p, content_description_header))
305 ton->content_descr_obj_num = i;
306 else if (CHECK_HEADER(p, extended_content_header))
307 ton->extended_content_descr_obj_num = i;
312 static const char top_level_header_object_guid[] = {
313 0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66, 0xcf, 0x11,
314 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
317 static int convert_utf8_to_utf16(char *src, char **dst)
320 * Without specifying LE (little endian), iconv includes a byte order
321 * mark (e.g. 0xFFFE) at the beginning.
323 iconv_t cd = iconv_open("UTF-16LE", "UTF-8");
324 size_t sz, inbytes, outbytes, inbytesleft, outbytesleft;
325 char *inbuf, *outbuf;
329 *dst = para_calloc(2);
333 if (cd == (iconv_t) -1)
334 return -ERRNO_TO_PARA_ERROR(errno);
336 /* even though src is in UTF-8, strlen() should DTRT */
337 inbytes = inbytesleft = strlen(src);
338 outbytes = outbytesleft = 4 * inbytes + 2; /* hope that's enough */
339 *dst = outbuf = para_malloc(outbytes);
340 sz = iconv(cd, ICONV_CAST &inbuf, &inbytesleft, &outbuf, &outbytesleft);
341 if (sz == (size_t)-1) {
342 ret = -ERRNO_TO_PARA_ERROR(errno);
345 assert(outbytes >= outbytesleft);
346 assert(outbytes - outbytesleft < INT_MAX - 2);
347 ret = outbytes - outbytesleft;
348 outbuf = para_realloc(*dst, ret + 2);
349 outbuf[ret] = outbuf[ret + 1] = '\0';
352 PARA_INFO_LOG("converted %s to %d UTF-16 bytes\n", src, ret);
356 if (iconv_close(cd) < 0)
357 PARA_WARNING_LOG("iconv_close: %s\n", strerror(errno));
361 /* The content description object contains artist, title, comment. */
362 static int make_cdo(struct taginfo *tags, const struct asf_object *cdo,
363 struct asf_object *result)
365 const char *cr, *rating; /* orig data */
366 uint16_t orig_title_bytes, orig_artist_bytes, orig_cr_bytes,
367 orig_comment_bytes, orig_rating_bytes;
368 /* pointers to new UTF-16 tags */
369 char *artist = NULL, *title = NULL, *comment = NULL;
370 /* number of bytes in UTF-16 for the new tags */
371 int artist_bytes, title_bytes, comment_bytes, ret;
372 char *p, null[2] = "\0\0";
376 ret = convert_utf8_to_utf16(tags->artist, &artist);
380 ret = convert_utf8_to_utf16(tags->title, &title);
384 ret = convert_utf8_to_utf16(tags->comment, &comment);
391 * Sizes of the five fields (stored as 16-bit numbers) are
392 * located after the header (16 bytes) and the cdo size (8
395 orig_title_bytes = read_u16(cdo->ptr + 24);
396 orig_artist_bytes = read_u16(cdo->ptr + 26);
397 orig_cr_bytes = read_u16(cdo->ptr + 28);
398 orig_comment_bytes = read_u16(cdo->ptr + 30);
399 orig_rating_bytes = read_u16(cdo->ptr + 32);
400 cr = cdo->ptr + 34 + orig_title_bytes + orig_artist_bytes;
401 rating = cr + orig_cr_bytes + orig_comment_bytes;
403 orig_title_bytes = 2;
404 orig_artist_bytes = 2;
406 orig_comment_bytes = 2;
407 orig_rating_bytes = 2;
412 /* compute size of result cdo */
413 result->size = 16 + 8 + 5 * 2 + title_bytes + artist_bytes
414 + orig_cr_bytes + comment_bytes + orig_rating_bytes;
415 PARA_DEBUG_LOG("cdo is %zu bytes\n", (size_t)result->size);
416 p = result->ptr = para_malloc(result->size);
417 memcpy(p, content_description_header, 16);
419 write_u64(p, result->size);
421 write_u16(p, title_bytes);
423 write_u16(p, artist_bytes);
425 write_u16(p, orig_cr_bytes);
427 write_u16(p, comment_bytes);
429 write_u16(p, orig_rating_bytes);
431 memcpy(p, title, title_bytes);
433 memcpy(p, artist, artist_bytes);
435 memcpy(p, cr, orig_cr_bytes);
437 memcpy(p, comment, comment_bytes);
439 memcpy(p, rating, orig_rating_bytes);
440 p += orig_rating_bytes;
441 assert(p - result->ptr == result->size);
450 /* The extended content description object contains album and year. */
451 static int make_ecdo(struct taginfo *tags, struct asf_object *result)
454 char *p, *album = NULL, *year = NULL, null[2] = "\0\0";
455 int album_bytes, year_bytes;
459 ret = convert_utf8_to_utf16(tags->album, &album);
463 ret = convert_utf8_to_utf16(tags->year, &year);
467 result->size = 16 + 8 + 2; /* GUID, size, count */
468 /* name_length + name + null + data type + val length + val */
469 result->size += 2 + sizeof(album_tag_header) + 2 + 2 + 2 + album_bytes;
470 result->size += 2 + sizeof(year_tag_header) + 2 + 2 + 2 + year_bytes;
472 p = result->ptr = para_malloc(result->size);
473 memcpy(p, extended_content_header, 16);
475 write_u64(p, result->size);
477 write_u16(p, 2); /* count */
481 write_u16(p, sizeof(album_tag_header) + 2);
483 memcpy(p, album_tag_header, sizeof(album_tag_header));
484 p += sizeof(album_tag_header);
487 write_u16(p, 0); /* data type (UTF-16) */
489 write_u16(p, album_bytes);
491 memcpy(p, album, album_bytes);
495 write_u16(p, sizeof(year_tag_header));
497 memcpy(p, year_tag_header, sizeof(year_tag_header));
498 p += sizeof(year_tag_header);
501 write_u16(p, 0); /* data type (UTF-16) */
503 write_u16(p, year_bytes);
505 memcpy(p, year, year_bytes);
507 assert(p - result->ptr == result->size);
515 static int write_output_file(int fd, const char *map, size_t mapsize,
516 struct afs_top_level_header_object *top, struct tag_object_nums *ton,
517 struct asf_object *cdo, struct asf_object *ecdo)
520 uint64_t sz; /* of the new header object */
521 uint32_t num_objects;
524 sz = 16 + 8 + 4 + 1 + 1; /* top-level header object */
525 for (i = 0; i < top->num_objects; i++) {
526 if (i == ton->content_descr_obj_num)
528 if (i == ton->extended_content_descr_obj_num)
530 sz += top->objects[i].size;
534 num_objects = top->num_objects;
535 if (ton->content_descr_obj_num < 0)
537 if (ton->extended_content_descr_obj_num < 0)
539 ret = xwrite(fd, top_level_header_object_guid, 16);
543 ret = xwrite(fd, tmp, 8);
546 write_u32(tmp, num_objects);
547 ret = xwrite(fd, tmp, 4);
550 write_u8(tmp, top->reserved1);
551 ret = xwrite(fd, tmp, 1);
554 write_u8(tmp, top->reserved2);
555 ret = xwrite(fd, tmp, 1);
559 * Write cto and ecto as objects 0 and 1 if they did not exist in the
562 if (ton->content_descr_obj_num < 0) {
563 ret = xwrite(fd, cdo->ptr, cdo->size);
567 if (ton->extended_content_descr_obj_num < 0) {
568 ret = xwrite(fd, ecdo->ptr, ecdo->size);
573 for (i = 0; i < top->num_objects; i++) {
574 char *buf = top->objects[i].ptr;
575 sz = top->objects[i].size;
576 if (i == ton->content_descr_obj_num) {
579 } else if (i == ton->extended_content_descr_obj_num) {
583 ret = xwrite(fd, buf, sz);
587 ret = xwrite(fd, map + top->size, mapsize - top->size);
592 static int wma_rewrite_tags(const char *map, size_t mapsize,
593 struct taginfo *tags, int fd,
594 __a_unused const char *filename)
596 struct afs_top_level_header_object top;
597 struct tag_object_nums ton = {-1, -1};
599 /* (extended) content description object */
600 struct asf_object cdo = {.ptr = NULL}, ecdo = {.ptr = NULL};
603 /* guid + size + num_objects + 2 * reserved */
604 if (mapsize < 16 + 8 + 4 + 1 + 1)
606 if (memcmp(map, top_level_header_object_guid, 16))
609 top.size = read_u64(p);
610 PARA_INFO_LOG("header_size: %lu\n", (long unsigned)top.size);
611 if (top.size >= mapsize)
614 top.num_objects = read_u32(p);
615 PARA_NOTICE_LOG("%u header objects\n", top.num_objects);
616 if (top.num_objects > top.size / 24)
619 top.reserved1 = read_u8(p);
621 top.reserved2 = read_u8(p);
622 if (top.reserved2 != 2)
624 p++; /* objects start at p */
625 top.objects = para_malloc(top.num_objects * sizeof(struct asf_object));
626 ret = read_asf_objects(p, top.size - (p - map), top.num_objects,
630 ret = make_cdo(tags, ton.content_descr_obj_num >= 0?
631 top.objects + ton.content_descr_obj_num : NULL, &cdo);
634 ret = make_ecdo(tags, &ecdo);
637 ret = write_output_file(fd, map, mapsize, &top, &ton, &cdo,
646 static const char * const wma_suffixes[] = {"wma", NULL};
649 * The init function of the wma audio format handler.
651 * \param afh Pointer to the struct to initialize.
653 void wma_afh_init(struct audio_format_handler *afh)
655 afh->get_file_info = wma_get_file_info;
656 afh->suffixes = wma_suffixes;
657 afh->rewrite_tags = wma_rewrite_tags;