1 /* Copyright (C) 2009 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file wma_afh.c The audio format handler for WMA files. */
12 #include "portable_io.h"
17 #define FOR_EACH_FRAME(_f, _buf, _size, _ps) for (_f = (_buf); \
18 _f + (_ps) < (_buf) + (_size); \
22 * Must be called on a frame boundary, e.g. start + header_len.
23 * \return Frame count, superframe count via *num_superframes.
25 static int count_frames(const char *buf, int buf_size, uint32_t packet_size,
28 int fc = 0, sfc = 0; /* frame count, superframe count */
32 FOR_EACH_FRAME(p, (uint8_t *)buf, buf_size, packet_size) {
33 fc += p[WMA_FRAME_SKIP] & 0x0f;
36 PARA_INFO_LOG("%d frames, %d superframes\n", fc, sfc);
37 *num_superframes = sfc;
42 * put_utf8() and get_str16() below are based on macros in libavutil/common.h
43 * of the mplayer source code, copyright (c) 2006 Michael Niedermayer
48 * Convert a 32-bit Unicode character to its UTF-8 encoded form.
50 * Writes up to 4 bytes for values in the valid UTF-8 range and up to 7 bytes
51 * in the general case, depending on the length of the converted Unicode
54 * \param result Where the converted UTF-8 bytes are written.
56 static int put_utf8(uint32_t val, char *result)
66 bytes = DIV_ROUND_UP(wma_log2(in), 5);
67 shift = (bytes - 1) * 6;
68 *out++ = (256 - (256 >> bytes)) | (in >> shift);
71 *out++ = 0x80 | ((in >> shift) & 0x3f);
76 static char *get_str16(const char *in, int len)
79 int out_size = 0, out_len = 0;
85 if (out_len + 7 + 1 >= out_size) {
86 out_size = 2 * out_size + 50;
87 out = para_realloc(out, out_size);
91 out_len += put_utf8(x, out + out_len);
100 static const char content_description_header[] = {
101 0x33, 0x26, 0xb2, 0x75, 0x8E, 0x66, 0xCF, 0x11,
102 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
105 static const char extended_content_header[] = {
106 0x40, 0xA4, 0xD0, 0xD2, 0x07, 0xE3, 0xD2, 0x11,
107 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50
110 static const char year_tag_header[] = { /* WM/Year */
111 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x59, 0x00,
112 0x65, 0x00, 0x61, 0x00, 0x72, 0x00
115 static const char album_tag_header[] = { /* WM/AlbumTitle */
116 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x41, 0x00,
117 0x6c, 0x00, 0x62, 0x00, 0x75, 0x00, 0x6d, 0x00,
118 0x54, 0x00, 0x69, 0x00, 0x74, 0x00, 0x6c, 0x00,
122 static void read_asf_tags(const char *buf, int buf_size, struct taginfo *ti)
124 const char *p, *end = buf + buf_size, *q;
125 uint16_t len1, len2, len3, len4;
127 p = search_pattern(content_description_header,
128 sizeof(content_description_header), buf, buf_size);
129 if (!p || p + 34 >= end) {
130 PARA_NOTICE_LOG("content description header not found\n");
142 /* ignore length of the rating information */
146 ti->title = get_str16(p, len1);
150 ti->artist = get_str16(p, len2);
154 ti->comment = get_str16(p, len4);
156 p = search_pattern(extended_content_header, sizeof(extended_content_header),
159 PARA_NOTICE_LOG("extended content header not found\n");
162 q = search_pattern(year_tag_header, sizeof(year_tag_header),
165 const char *r = q + sizeof(year_tag_header) + 6;
167 ti->year = get_str16(r, end - r);
169 q = search_pattern(album_tag_header, sizeof(album_tag_header),
172 const char *r = q + sizeof(album_tag_header) + 6;
174 ti->album = get_str16(r, end - r);
178 static void set_chunk_tv(int frames_per_chunk, int frequency,
179 struct timeval *result)
181 uint64_t x = (uint64_t)frames_per_chunk * 2048 * 1000 * 1000
184 result->tv_sec = x / 1000 / 1000;
185 result->tv_usec = x % (1000 * 1000);
186 PARA_INFO_LOG("chunk time: %lums\n", tv2ms(result));
189 /* Must be called on a frame boundary. */
190 static int wma_make_chunk_table(char *buf, size_t buf_size, uint32_t packet_size,
191 struct afh_info *afhi)
193 const uint8_t *f, *start = (uint8_t *)buf;
194 int j, frames_per_chunk;
195 size_t ct_size = 250;
196 int ret, count = 0, num_frames, num_superframes;
198 afhi->chunk_table = arr_alloc(ct_size, sizeof(uint32_t));
199 afhi->chunk_table[0] = 0;
200 afhi->chunk_table[1] = afhi->header_len;
202 num_frames = count_frames(buf, buf_size, packet_size,
205 if (num_frames == 0 || num_superframes == 0)
207 afhi->seconds_total = num_frames * 2048 /* FIXME */
209 frames_per_chunk = num_frames / num_superframes / 2;
210 PARA_INFO_LOG("%d frames per chunk\n", frames_per_chunk);
212 FOR_EACH_FRAME(f, start, buf_size, packet_size) {
213 count += f[WMA_FRAME_SKIP] & 0x0f;
214 while (count > j * frames_per_chunk) {
218 afhi->chunk_table = para_realloc(
220 ct_size * sizeof(uint32_t));
222 afhi->chunk_table[j] = f - start + afhi->header_len
226 afhi->chunks_total = j;
227 set_max_chunk_size(afhi);
228 set_chunk_tv(frames_per_chunk, afhi->frequency, &afhi->chunk_tv);
231 free(afhi->chunk_table);
235 static int wma_get_file_info(char *map, size_t numbytes, __a_unused int fd,
236 struct afh_info *afhi)
239 struct asf_header_info ahi;
241 ret = read_asf_header(map, numbytes, &ahi);
246 afhi->bitrate = ahi.bit_rate / 1000;
247 if (ahi.sample_rate == 0)
249 afhi->frequency = ahi.sample_rate;
250 afhi->channels = ahi.channels;
251 afhi->header_len = ahi.header_len;
253 afhi->techinfo = make_message("%s%s%s%s%s",
254 ahi.use_exp_vlc? "exp vlc" : "",
255 (ahi.use_bit_reservoir && ahi.use_exp_vlc)? ", " : "",
256 ahi.use_bit_reservoir? "bit reservoir" : "",
257 (ahi.use_variable_block_len &&
258 (ahi.use_exp_vlc || ahi.use_bit_reservoir)? ", " : ""),
259 ahi.use_variable_block_len? "vbl" : ""
261 wma_make_chunk_table(map + ahi.header_len, numbytes - ahi.header_len,
262 ahi.packet_size, afhi);
263 read_asf_tags(map, ahi.header_len, &afhi->tags);
272 struct tag_object_nums {
273 int content_descr_obj_num;
274 int extended_content_descr_obj_num;
277 struct afs_top_level_header_object {
279 uint32_t num_objects;
280 uint8_t reserved1, reserved2;
281 struct asf_object *objects;
284 #define CHECK_HEADER(_p, _h) (memcmp((_p), (_h), sizeof((_h))) == 0)
286 static int read_asf_objects(const char *src, size_t size, uint32_t num_objects,
287 struct asf_object *objs, struct tag_object_nums *ton)
292 for (i = 0, p = src; i < num_objects; p += objs[i++].size) {
293 if (p + 24 > src + size)
295 objs[i].ptr = (char *)p;
296 objs[i].size = read_u64(p + 16);
297 if (p + objs[i].size > src + size)
300 if (CHECK_HEADER(p, content_description_header))
301 ton->content_descr_obj_num = i;
302 else if (CHECK_HEADER(p, extended_content_header))
303 ton->extended_content_descr_obj_num = i;
308 static const char top_level_header_object_guid[] = {
309 0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66, 0xcf, 0x11,
310 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
313 static int convert_utf8_to_utf16(char *src, char **dst)
316 size_t sz, inbytes, outbytes, inbytesleft, outbytesleft;
317 char *inbuf, *outbuf;
325 * Without specifying LE (little endian), iconv includes a byte order
326 * mark (e.g. 0xFFFE) at the beginning.
328 cd = iconv_open("UTF-16LE", "UTF-8");
329 if (cd == (iconv_t)-1) {
331 return -ERRNO_TO_PARA_ERROR(errno);
334 /* even though src is in UTF-8, strlen() should DTRT */
335 inbytes = inbytesleft = strlen(src);
336 outbytes = outbytesleft = 4 * inbytes + 2; /* hope that's enough */
337 *dst = outbuf = alloc(outbytes);
338 sz = iconv(cd, ICONV_CAST &inbuf, &inbytesleft, &outbuf, &outbytesleft);
339 if (sz == (size_t)-1) {
340 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);
354 if (iconv_close(cd) < 0)
355 PARA_WARNING_LOG("iconv_close: %s\n", strerror(errno));
359 /* The content description object contains artist, title, comment. */
360 static int make_cdo(struct taginfo *tags, const struct asf_object *cdo,
361 struct asf_object *result)
363 const char *cr, *rating; /* orig data */
364 uint16_t orig_cr_bytes, orig_rating_bytes;
365 /* pointers to new UTF-16 tags */
366 char *artist = NULL, *title = NULL, *comment = NULL;
367 /* number of bytes in UTF-16 for the new tags */
368 int artist_bytes, title_bytes, comment_bytes, ret;
369 char *p, null[2] = "\0\0";
373 ret = convert_utf8_to_utf16(tags->artist, &artist);
378 ret = convert_utf8_to_utf16(tags->title, &title);
383 ret = convert_utf8_to_utf16(tags->comment, &comment);
390 uint16_t orig_title_bytes, orig_artist_bytes, orig_comment_bytes;
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;
405 orig_rating_bytes = 2;
410 /* compute size of result cdo */
411 result->size = 16 + 8 + 5 * 2 + title_bytes + artist_bytes
412 + orig_cr_bytes + comment_bytes + orig_rating_bytes;
413 PARA_DEBUG_LOG("cdo is %zu bytes\n", (size_t)result->size);
414 p = result->ptr = alloc(result->size);
415 memcpy(p, content_description_header, 16);
417 write_u64(p, result->size);
419 write_u16(p, title_bytes);
421 write_u16(p, artist_bytes);
423 write_u16(p, orig_cr_bytes);
425 write_u16(p, comment_bytes);
427 write_u16(p, orig_rating_bytes);
429 memcpy(p, title, title_bytes);
431 memcpy(p, artist, artist_bytes);
433 memcpy(p, cr, orig_cr_bytes);
435 memcpy(p, comment, comment_bytes);
437 memcpy(p, rating, orig_rating_bytes);
438 p += orig_rating_bytes;
439 assert(p - result->ptr == result->size);
448 /* The extended content description object contains album and year. */
449 static int make_ecdo(struct taginfo *tags, struct asf_object *result)
452 char *p, *album = NULL, *year = NULL, null[2] = "\0\0";
453 int album_bytes, year_bytes;
457 ret = convert_utf8_to_utf16(tags->album, &album);
462 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 = alloc(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 = arr_alloc(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 audio format handler for Windows Media Audio.
651 * Only WMA version 2 is supported. This audio format handler does not depend
652 * on any third party libraries and is therefore always compiled in.
654 const struct audio_format_handler wma_afh = {
655 .get_file_info = wma_get_file_info,
656 .suffixes = wma_suffixes,
657 .rewrite_tags = wma_rewrite_tags,