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_max_chunk_size(afhi);
233 set_chunk_tv(frames_per_chunk, afhi->frequency, &afhi->chunk_tv);
236 free(afhi->chunk_table);
240 static int wma_get_file_info(char *map, size_t numbytes, __a_unused int fd,
241 struct afh_info *afhi)
244 struct asf_header_info ahi;
246 ret = read_asf_header(map, numbytes, &ahi);
251 afhi->bitrate = ahi.bit_rate / 1000;
252 if (ahi.sample_rate == 0)
254 afhi->frequency = ahi.sample_rate;
255 afhi->channels = ahi.channels;
256 afhi->header_len = ahi.header_len;
258 afhi->techinfo = make_message("%s%s%s%s%s",
259 ahi.use_exp_vlc? "exp vlc" : "",
260 (ahi.use_bit_reservoir && ahi.use_exp_vlc)? ", " : "",
261 ahi.use_bit_reservoir? "bit reservoir" : "",
262 (ahi.use_variable_block_len &&
263 (ahi.use_exp_vlc || ahi.use_bit_reservoir)? ", " : ""),
264 ahi.use_variable_block_len? "vbl" : ""
266 wma_make_chunk_table(map + ahi.header_len, numbytes - ahi.header_len,
267 ahi.packet_size, afhi);
268 read_asf_tags(map, ahi.header_len, &afhi->tags);
277 struct tag_object_nums {
278 int content_descr_obj_num;
279 int extended_content_descr_obj_num;
282 struct afs_top_level_header_object {
284 uint32_t num_objects;
285 uint8_t reserved1, reserved2;
286 struct asf_object *objects;
289 #define CHECK_HEADER(_p, _h) (memcmp((_p), (_h), sizeof((_h))) == 0)
291 static int read_asf_objects(const char *src, size_t size, uint32_t num_objects,
292 struct asf_object *objs, struct tag_object_nums *ton)
297 for (i = 0, p = src; i < num_objects; p += objs[i++].size) {
298 if (p + 24 > src + size)
300 objs[i].ptr = (char *)p;
301 objs[i].size = read_u64(p + 16);
302 if (p + objs[i].size > src + size)
305 if (CHECK_HEADER(p, content_description_header))
306 ton->content_descr_obj_num = i;
307 else if (CHECK_HEADER(p, extended_content_header))
308 ton->extended_content_descr_obj_num = i;
313 static const char top_level_header_object_guid[] = {
314 0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66, 0xcf, 0x11,
315 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
318 static int convert_utf8_to_utf16(char *src, char **dst)
321 * Without specifying LE (little endian), iconv includes a byte order
322 * mark (e.g. 0xFFFE) at the beginning.
324 iconv_t cd = iconv_open("UTF-16LE", "UTF-8");
325 size_t sz, inbytes, outbytes, inbytesleft, outbytesleft;
326 char *inbuf, *outbuf;
330 *dst = para_calloc(2);
334 if (cd == (iconv_t) -1)
335 return -ERRNO_TO_PARA_ERROR(errno);
337 /* even though src is in UTF-8, strlen() should DTRT */
338 inbytes = inbytesleft = strlen(src);
339 outbytes = outbytesleft = 4 * inbytes + 2; /* hope that's enough */
340 *dst = outbuf = para_malloc(outbytes);
341 sz = iconv(cd, ICONV_CAST &inbuf, &inbytesleft, &outbuf, &outbytesleft);
342 if (sz == (size_t)-1) {
343 ret = -ERRNO_TO_PARA_ERROR(errno);
346 assert(outbytes >= outbytesleft);
347 assert(outbytes - outbytesleft < INT_MAX - 2);
348 ret = outbytes - outbytesleft;
349 outbuf = para_realloc(*dst, ret + 2);
350 outbuf[ret] = outbuf[ret + 1] = '\0';
353 PARA_INFO_LOG("converted %s to %d UTF-16 bytes\n", src, ret);
357 if (iconv_close(cd) < 0)
358 PARA_WARNING_LOG("iconv_close: %s\n", strerror(errno));
362 /* The content description object contains artist, title, comment. */
363 static int make_cdo(struct taginfo *tags, const struct asf_object *cdo,
364 struct asf_object *result)
366 const char *cr, *rating; /* orig data */
367 uint16_t orig_title_bytes, orig_artist_bytes, orig_cr_bytes,
368 orig_comment_bytes, orig_rating_bytes;
369 /* pointers to new UTF-16 tags */
370 char *artist = NULL, *title = NULL, *comment = NULL;
371 /* number of bytes in UTF-16 for the new tags */
372 int artist_bytes, title_bytes, comment_bytes, ret;
373 char *p, null[2] = "\0\0";
377 ret = convert_utf8_to_utf16(tags->artist, &artist);
381 ret = convert_utf8_to_utf16(tags->title, &title);
385 ret = convert_utf8_to_utf16(tags->comment, &comment);
392 * Sizes of the five fields (stored as 16-bit numbers) are
393 * located after the header (16 bytes) and the cdo size (8
396 orig_title_bytes = read_u16(cdo->ptr + 24);
397 orig_artist_bytes = read_u16(cdo->ptr + 26);
398 orig_cr_bytes = read_u16(cdo->ptr + 28);
399 orig_comment_bytes = read_u16(cdo->ptr + 30);
400 orig_rating_bytes = read_u16(cdo->ptr + 32);
401 cr = cdo->ptr + 34 + orig_title_bytes + orig_artist_bytes;
402 rating = cr + orig_cr_bytes + orig_comment_bytes;
404 orig_title_bytes = 2;
405 orig_artist_bytes = 2;
407 orig_comment_bytes = 2;
408 orig_rating_bytes = 2;
413 /* compute size of result cdo */
414 result->size = 16 + 8 + 5 * 2 + title_bytes + artist_bytes
415 + orig_cr_bytes + comment_bytes + orig_rating_bytes;
416 PARA_DEBUG_LOG("cdo is %zu bytes\n", (size_t)result->size);
417 p = result->ptr = para_malloc(result->size);
418 memcpy(p, content_description_header, 16);
420 write_u64(p, result->size);
422 write_u16(p, title_bytes);
424 write_u16(p, artist_bytes);
426 write_u16(p, orig_cr_bytes);
428 write_u16(p, comment_bytes);
430 write_u16(p, orig_rating_bytes);
432 memcpy(p, title, title_bytes);
434 memcpy(p, artist, artist_bytes);
436 memcpy(p, cr, orig_cr_bytes);
438 memcpy(p, comment, comment_bytes);
440 memcpy(p, rating, orig_rating_bytes);
441 p += orig_rating_bytes;
442 assert(p - result->ptr == result->size);
451 /* The extended content description object contains album and year. */
452 static int make_ecdo(struct taginfo *tags, struct asf_object *result)
455 char *p, *album = NULL, *year = NULL, null[2] = "\0\0";
456 int album_bytes, year_bytes;
460 ret = convert_utf8_to_utf16(tags->album, &album);
464 ret = convert_utf8_to_utf16(tags->year, &year);
468 result->size = 16 + 8 + 2; /* GUID, size, count */
469 /* name_length + name + null + data type + val length + val */
470 result->size += 2 + sizeof(album_tag_header) + 2 + 2 + 2 + album_bytes;
471 result->size += 2 + sizeof(year_tag_header) + 2 + 2 + 2 + year_bytes;
473 p = result->ptr = para_malloc(result->size);
474 memcpy(p, extended_content_header, 16);
476 write_u64(p, result->size);
478 write_u16(p, 2); /* count */
482 write_u16(p, sizeof(album_tag_header) + 2);
484 memcpy(p, album_tag_header, sizeof(album_tag_header));
485 p += sizeof(album_tag_header);
488 write_u16(p, 0); /* data type (UTF-16) */
490 write_u16(p, album_bytes);
492 memcpy(p, album, album_bytes);
496 write_u16(p, sizeof(year_tag_header));
498 memcpy(p, year_tag_header, sizeof(year_tag_header));
499 p += sizeof(year_tag_header);
502 write_u16(p, 0); /* data type (UTF-16) */
504 write_u16(p, year_bytes);
506 memcpy(p, year, year_bytes);
508 assert(p - result->ptr == result->size);
516 static int write_output_file(int fd, const char *map, size_t mapsize,
517 struct afs_top_level_header_object *top, struct tag_object_nums *ton,
518 struct asf_object *cdo, struct asf_object *ecdo)
521 uint64_t sz; /* of the new header object */
522 uint32_t num_objects;
525 sz = 16 + 8 + 4 + 1 + 1; /* top-level header object */
526 for (i = 0; i < top->num_objects; i++) {
527 if (i == ton->content_descr_obj_num)
529 if (i == ton->extended_content_descr_obj_num)
531 sz += top->objects[i].size;
535 num_objects = top->num_objects;
536 if (ton->content_descr_obj_num < 0)
538 if (ton->extended_content_descr_obj_num < 0)
540 ret = xwrite(fd, top_level_header_object_guid, 16);
544 ret = xwrite(fd, tmp, 8);
547 write_u32(tmp, num_objects);
548 ret = xwrite(fd, tmp, 4);
551 write_u8(tmp, top->reserved1);
552 ret = xwrite(fd, tmp, 1);
555 write_u8(tmp, top->reserved2);
556 ret = xwrite(fd, tmp, 1);
560 * Write cto and ecto as objects 0 and 1 if they did not exist in the
563 if (ton->content_descr_obj_num < 0) {
564 ret = xwrite(fd, cdo->ptr, cdo->size);
568 if (ton->extended_content_descr_obj_num < 0) {
569 ret = xwrite(fd, ecdo->ptr, ecdo->size);
574 for (i = 0; i < top->num_objects; i++) {
575 char *buf = top->objects[i].ptr;
576 sz = top->objects[i].size;
577 if (i == ton->content_descr_obj_num) {
580 } else if (i == ton->extended_content_descr_obj_num) {
584 ret = xwrite(fd, buf, sz);
588 ret = xwrite(fd, map + top->size, mapsize - top->size);
593 static int wma_rewrite_tags(const char *map, size_t mapsize,
594 struct taginfo *tags, int fd,
595 __a_unused const char *filename)
597 struct afs_top_level_header_object top;
598 struct tag_object_nums ton = {-1, -1};
600 /* (extended) content description object */
601 struct asf_object cdo = {.ptr = NULL}, ecdo = {.ptr = NULL};
604 /* guid + size + num_objects + 2 * reserved */
605 if (mapsize < 16 + 8 + 4 + 1 + 1)
607 if (memcmp(map, top_level_header_object_guid, 16))
610 top.size = read_u64(p);
611 PARA_INFO_LOG("header_size: %lu\n", (long unsigned)top.size);
612 if (top.size >= mapsize)
615 top.num_objects = read_u32(p);
616 PARA_NOTICE_LOG("%u header objects\n", top.num_objects);
617 if (top.num_objects > top.size / 24)
620 top.reserved1 = read_u8(p);
622 top.reserved2 = read_u8(p);
623 if (top.reserved2 != 2)
625 p++; /* objects start at p */
626 top.objects = para_malloc(top.num_objects * sizeof(struct asf_object));
627 ret = read_asf_objects(p, top.size - (p - map), top.num_objects,
631 ret = make_cdo(tags, ton.content_descr_obj_num >= 0?
632 top.objects + ton.content_descr_obj_num : NULL, &cdo);
635 ret = make_ecdo(tags, &ecdo);
638 ret = write_output_file(fd, map, mapsize, &top, &ton, &cdo,
647 static const char * const wma_suffixes[] = {"wma", NULL};
650 * The init function of the wma audio format handler.
652 * \param afh Pointer to the struct to initialize.
654 void wma_afh_init(struct audio_format_handler *afh)
656 afh->get_file_info = wma_get_file_info;
657 afh->suffixes = wma_suffixes;
658 afh->rewrite_tags = wma_rewrite_tags;