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);
41 *num_superframes = sfc;
46 * put_utf8() and get_str16() below are based on macros in libavutil/common.h
47 * of the mplayer source code, copyright (c) 2006 Michael Niedermayer
52 * Convert a 32-bit Unicode character to its UTF-8 encoded form.
54 * Writes up to 4 bytes for values in the valid UTF-8 range and up to 7 bytes
55 * in the general case, depending on the length of the converted Unicode
58 * \param result Where the converted UTF-8 bytes are written.
60 static int put_utf8(uint32_t val, char *result)
70 bytes = DIV_ROUND_UP(wma_log2(in), 5);
71 shift = (bytes - 1) * 6;
72 *out++ = (256 - (256 >> bytes)) | (in >> shift);
75 *out++ = 0x80 | ((in >> shift) & 0x3f);
80 static char *get_str16(const char *in, int len)
83 int out_size = 0, out_len = 0;
89 if (out_len + 7 + 1 >= out_size) {
90 out_size = 2 * out_size + 50;
91 out = para_realloc(out, out_size);
95 out_len += put_utf8(x, out + out_len);
104 static const char content_description_header[] = {
105 0x33, 0x26, 0xb2, 0x75, 0x8E, 0x66, 0xCF, 0x11,
106 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c
109 static const char extended_content_header[] = {
110 0x40, 0xA4, 0xD0, 0xD2, 0x07, 0xE3, 0xD2, 0x11,
111 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50
114 static const char year_tag_header[] = { /* WM/Year */
115 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x59, 0x00,
116 0x65, 0x00, 0x61, 0x00, 0x72, 0x00
119 static const char album_tag_header[] = { /* WM/AlbumTitle */
120 0x57, 0x00, 0x4d, 0x00, 0x2f, 0x00, 0x41, 0x00,
121 0x6c, 0x00, 0x62, 0x00, 0x75, 0x00, 0x6d, 0x00,
122 0x54, 0x00, 0x69, 0x00, 0x74, 0x00, 0x6c, 0x00,
126 static void read_asf_tags(const char *buf, int buf_size, struct taginfo *ti)
128 const char *p, *end = buf + buf_size, *q;
129 uint16_t len1, len2, len3, len4;
131 p = search_pattern(content_description_header,
132 sizeof(content_description_header), buf, buf_size);
133 if (!p || p + 34 >= end) {
134 PARA_NOTICE_LOG("content description header not found\n");
146 /* ignore length of the rating information */
150 ti->title = get_str16(p, len1);
154 ti->artist = get_str16(p, len2);
158 ti->comment = get_str16(p, len4);
160 p = search_pattern(extended_content_header, sizeof(extended_content_header),
163 PARA_NOTICE_LOG("extended content header not found\n");
166 q = search_pattern(year_tag_header, sizeof(year_tag_header),
169 const char *r = q + sizeof(year_tag_header) + 6;
171 ti->year = get_str16(r, end - r);
173 q = search_pattern(album_tag_header, sizeof(album_tag_header),
176 const char *r = q + sizeof(album_tag_header) + 6;
178 ti->album = get_str16(r, end - r);
182 static void set_chunk_tv(int frames_per_chunk, int frequency,
183 struct timeval *result)
185 uint64_t x = (uint64_t)frames_per_chunk * 2048 * 1000 * 1000
188 result->tv_sec = x / 1000 / 1000;
189 result->tv_usec = x % (1000 * 1000);
190 PARA_INFO_LOG("chunk time: %lums\n", tv2ms(result));
193 /* Must be called on a frame boundary. */
194 static int wma_make_chunk_table(char *buf, size_t buf_size, uint32_t packet_size,
195 struct afh_info *afhi)
197 const uint8_t *f, *start = (uint8_t *)buf;
198 int j, frames_per_chunk;
199 size_t ct_size = 250;
200 int ret, count = 0, num_frames, num_superframes;
202 afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
203 afhi->chunk_table[0] = 0;
204 afhi->chunk_table[1] = afhi->header_len;
206 num_frames = count_frames(buf, buf_size, packet_size,
209 if (num_frames == 0 || num_superframes == 0)
211 afhi->seconds_total = num_frames * 2048 /* FIXME */
213 frames_per_chunk = num_frames / num_superframes / 2;
214 PARA_INFO_LOG("%d frames per chunk\n", frames_per_chunk);
216 FOR_EACH_FRAME(f, start, buf_size, packet_size) {
217 count += f[WMA_FRAME_SKIP] & 0x0f;
218 while (count > j * frames_per_chunk) {
222 afhi->chunk_table = para_realloc(
224 ct_size * sizeof(uint32_t));
226 afhi->chunk_table[j] = f - start + afhi->header_len
230 afhi->chunks_total = j;
231 set_max_chunk_size(afhi);
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 size_t sz, inbytes, outbytes, inbytesleft, outbytesleft;
321 char *inbuf, *outbuf;
325 *dst = para_calloc(2);
329 * Without specifying LE (little endian), iconv includes a byte order
330 * mark (e.g. 0xFFFE) at the beginning.
332 cd = iconv_open("UTF-16LE", "UTF-8");
333 if (cd == (iconv_t)-1) {
335 return -ERRNO_TO_PARA_ERROR(errno);
338 /* even though src is in UTF-8, strlen() should DTRT */
339 inbytes = inbytesleft = strlen(src);
340 outbytes = outbytesleft = 4 * inbytes + 2; /* hope that's enough */
341 *dst = outbuf = para_malloc(outbytes);
342 sz = iconv(cd, ICONV_CAST &inbuf, &inbytesleft, &outbuf, &outbytesleft);
343 if (sz == (size_t)-1) {
344 ret = -ERRNO_TO_PARA_ERROR(errno);
349 assert(outbytes >= outbytesleft);
350 assert(outbytes - outbytesleft < INT_MAX - 2);
351 ret = outbytes - outbytesleft;
352 outbuf = para_realloc(*dst, ret + 2);
353 outbuf[ret] = outbuf[ret + 1] = '\0';
356 PARA_INFO_LOG("converted %s to %d UTF-16 bytes\n", src, ret);
358 if (iconv_close(cd) < 0)
359 PARA_WARNING_LOG("iconv_close: %s\n", strerror(errno));
363 /* The content description object contains artist, title, comment. */
364 static int make_cdo(struct taginfo *tags, const struct asf_object *cdo,
365 struct asf_object *result)
367 const char *cr, *rating; /* orig data */
368 uint16_t orig_cr_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);
382 ret = convert_utf8_to_utf16(tags->title, &title);
387 ret = convert_utf8_to_utf16(tags->comment, &comment);
394 uint16_t orig_title_bytes, orig_artist_bytes, orig_comment_bytes;
396 * Sizes of the five fields (stored as 16-bit numbers) are
397 * located after the header (16 bytes) and the cdo size (8
400 orig_title_bytes = read_u16(cdo->ptr + 24);
401 orig_artist_bytes = read_u16(cdo->ptr + 26);
402 orig_cr_bytes = read_u16(cdo->ptr + 28);
403 orig_comment_bytes = read_u16(cdo->ptr + 30);
404 orig_rating_bytes = read_u16(cdo->ptr + 32);
405 cr = cdo->ptr + 34 + orig_title_bytes + orig_artist_bytes;
406 rating = cr + orig_cr_bytes + orig_comment_bytes;
409 orig_rating_bytes = 2;
414 /* compute size of result cdo */
415 result->size = 16 + 8 + 5 * 2 + title_bytes + artist_bytes
416 + orig_cr_bytes + comment_bytes + orig_rating_bytes;
417 PARA_DEBUG_LOG("cdo is %zu bytes\n", (size_t)result->size);
418 p = result->ptr = para_malloc(result->size);
419 memcpy(p, content_description_header, 16);
421 write_u64(p, result->size);
423 write_u16(p, title_bytes);
425 write_u16(p, artist_bytes);
427 write_u16(p, orig_cr_bytes);
429 write_u16(p, comment_bytes);
431 write_u16(p, orig_rating_bytes);
433 memcpy(p, title, title_bytes);
435 memcpy(p, artist, artist_bytes);
437 memcpy(p, cr, orig_cr_bytes);
439 memcpy(p, comment, comment_bytes);
441 memcpy(p, rating, orig_rating_bytes);
442 p += orig_rating_bytes;
443 assert(p - result->ptr == result->size);
452 /* The extended content description object contains album and year. */
453 static int make_ecdo(struct taginfo *tags, struct asf_object *result)
456 char *p, *album = NULL, *year = NULL, null[2] = "\0\0";
457 int album_bytes, year_bytes;
461 ret = convert_utf8_to_utf16(tags->album, &album);
466 ret = convert_utf8_to_utf16(tags->year, &year);
471 result->size = 16 + 8 + 2; /* GUID, size, count */
472 /* name_length + name + null + data type + val length + val */
473 result->size += 2 + sizeof(album_tag_header) + 2 + 2 + 2 + album_bytes;
474 result->size += 2 + sizeof(year_tag_header) + 2 + 2 + 2 + year_bytes;
476 p = result->ptr = para_malloc(result->size);
477 memcpy(p, extended_content_header, 16);
479 write_u64(p, result->size);
481 write_u16(p, 2); /* count */
485 write_u16(p, sizeof(album_tag_header) + 2);
487 memcpy(p, album_tag_header, sizeof(album_tag_header));
488 p += sizeof(album_tag_header);
491 write_u16(p, 0); /* data type (UTF-16) */
493 write_u16(p, album_bytes);
495 memcpy(p, album, album_bytes);
499 write_u16(p, sizeof(year_tag_header));
501 memcpy(p, year_tag_header, sizeof(year_tag_header));
502 p += sizeof(year_tag_header);
505 write_u16(p, 0); /* data type (UTF-16) */
507 write_u16(p, year_bytes);
509 memcpy(p, year, year_bytes);
511 assert(p - result->ptr == result->size);
519 static int write_output_file(int fd, const char *map, size_t mapsize,
520 struct afs_top_level_header_object *top, struct tag_object_nums *ton,
521 struct asf_object *cdo, struct asf_object *ecdo)
524 uint64_t sz; /* of the new header object */
525 uint32_t num_objects;
528 sz = 16 + 8 + 4 + 1 + 1; /* top-level header object */
529 for (i = 0; i < top->num_objects; i++) {
530 if (i == ton->content_descr_obj_num)
532 if (i == ton->extended_content_descr_obj_num)
534 sz += top->objects[i].size;
538 num_objects = top->num_objects;
539 if (ton->content_descr_obj_num < 0)
541 if (ton->extended_content_descr_obj_num < 0)
543 ret = xwrite(fd, top_level_header_object_guid, 16);
547 ret = xwrite(fd, tmp, 8);
550 write_u32(tmp, num_objects);
551 ret = xwrite(fd, tmp, 4);
554 write_u8(tmp, top->reserved1);
555 ret = xwrite(fd, tmp, 1);
558 write_u8(tmp, top->reserved2);
559 ret = xwrite(fd, tmp, 1);
563 * Write cto and ecto as objects 0 and 1 if they did not exist in the
566 if (ton->content_descr_obj_num < 0) {
567 ret = xwrite(fd, cdo->ptr, cdo->size);
571 if (ton->extended_content_descr_obj_num < 0) {
572 ret = xwrite(fd, ecdo->ptr, ecdo->size);
577 for (i = 0; i < top->num_objects; i++) {
578 char *buf = top->objects[i].ptr;
579 sz = top->objects[i].size;
580 if (i == ton->content_descr_obj_num) {
583 } else if (i == ton->extended_content_descr_obj_num) {
587 ret = xwrite(fd, buf, sz);
591 ret = xwrite(fd, map + top->size, mapsize - top->size);
596 static int wma_rewrite_tags(const char *map, size_t mapsize,
597 struct taginfo *tags, int fd,
598 __a_unused const char *filename)
600 struct afs_top_level_header_object top;
601 struct tag_object_nums ton = {-1, -1};
603 /* (extended) content description object */
604 struct asf_object cdo = {.ptr = NULL}, ecdo = {.ptr = NULL};
607 /* guid + size + num_objects + 2 * reserved */
608 if (mapsize < 16 + 8 + 4 + 1 + 1)
610 if (memcmp(map, top_level_header_object_guid, 16))
613 top.size = read_u64(p);
614 PARA_INFO_LOG("header_size: %lu\n", (long unsigned)top.size);
615 if (top.size >= mapsize)
618 top.num_objects = read_u32(p);
619 PARA_NOTICE_LOG("%u header objects\n", top.num_objects);
620 if (top.num_objects > top.size / 24)
623 top.reserved1 = read_u8(p);
625 top.reserved2 = read_u8(p);
626 if (top.reserved2 != 2)
628 p++; /* objects start at p */
629 top.objects = para_malloc(top.num_objects * sizeof(struct asf_object));
630 ret = read_asf_objects(p, top.size - (p - map), top.num_objects,
634 ret = make_cdo(tags, ton.content_descr_obj_num >= 0?
635 top.objects + ton.content_descr_obj_num : NULL, &cdo);
638 ret = make_ecdo(tags, &ecdo);
641 ret = write_output_file(fd, map, mapsize, &top, &ton, &cdo,
650 static const char * const wma_suffixes[] = {"wma", NULL};
653 * The init function of the wma audio format handler.
655 * \param afh Pointer to the struct to initialize.
657 void wma_afh_init(struct audio_format_handler *afh)
659 afh->get_file_info = wma_get_file_info;
660 afh->suffixes = wma_suffixes;
661 afh->rewrite_tags = wma_rewrite_tags;