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);
381 ret = convert_utf8_to_utf16(tags->title, &title);
385 ret = convert_utf8_to_utf16(tags->comment, &comment);
391 uint16_t orig_title_bytes, orig_artist_bytes, orig_comment_bytes;
393 * Sizes of the five fields (stored as 16-bit numbers) are
394 * located after the header (16 bytes) and the cdo size (8
397 orig_title_bytes = read_u16(cdo->ptr + 24);
398 orig_artist_bytes = read_u16(cdo->ptr + 26);
399 orig_cr_bytes = read_u16(cdo->ptr + 28);
400 orig_comment_bytes = read_u16(cdo->ptr + 30);
401 orig_rating_bytes = read_u16(cdo->ptr + 32);
402 cr = cdo->ptr + 34 + orig_title_bytes + orig_artist_bytes;
403 rating = cr + orig_cr_bytes + orig_comment_bytes;
406 orig_rating_bytes = 2;
411 /* compute size of result cdo */
412 result->size = 16 + 8 + 5 * 2 + title_bytes + artist_bytes
413 + orig_cr_bytes + comment_bytes + orig_rating_bytes;
414 PARA_DEBUG_LOG("cdo is %zu bytes\n", (size_t)result->size);
415 p = result->ptr = para_malloc(result->size);
416 memcpy(p, content_description_header, 16);
418 write_u64(p, result->size);
420 write_u16(p, title_bytes);
422 write_u16(p, artist_bytes);
424 write_u16(p, orig_cr_bytes);
426 write_u16(p, comment_bytes);
428 write_u16(p, orig_rating_bytes);
430 memcpy(p, title, title_bytes);
432 memcpy(p, artist, artist_bytes);
434 memcpy(p, cr, orig_cr_bytes);
436 memcpy(p, comment, comment_bytes);
438 memcpy(p, rating, orig_rating_bytes);
439 p += orig_rating_bytes;
440 assert(p - result->ptr == result->size);
449 /* The extended content description object contains album and year. */
450 static int make_ecdo(struct taginfo *tags, struct asf_object *result)
453 char *p, *album = NULL, *year = NULL, null[2] = "\0\0";
454 int album_bytes, year_bytes;
458 ret = convert_utf8_to_utf16(tags->album, &album);
462 ret = convert_utf8_to_utf16(tags->year, &year);
466 result->size = 16 + 8 + 2; /* GUID, size, count */
467 /* name_length + name + null + data type + val length + val */
468 result->size += 2 + sizeof(album_tag_header) + 2 + 2 + 2 + album_bytes;
469 result->size += 2 + sizeof(year_tag_header) + 2 + 2 + 2 + year_bytes;
471 p = result->ptr = para_malloc(result->size);
472 memcpy(p, extended_content_header, 16);
474 write_u64(p, result->size);
476 write_u16(p, 2); /* count */
480 write_u16(p, sizeof(album_tag_header) + 2);
482 memcpy(p, album_tag_header, sizeof(album_tag_header));
483 p += sizeof(album_tag_header);
486 write_u16(p, 0); /* data type (UTF-16) */
488 write_u16(p, album_bytes);
490 memcpy(p, album, album_bytes);
494 write_u16(p, sizeof(year_tag_header));
496 memcpy(p, year_tag_header, sizeof(year_tag_header));
497 p += sizeof(year_tag_header);
500 write_u16(p, 0); /* data type (UTF-16) */
502 write_u16(p, year_bytes);
504 memcpy(p, year, year_bytes);
506 assert(p - result->ptr == result->size);
514 static int write_output_file(int fd, const char *map, size_t mapsize,
515 struct afs_top_level_header_object *top, struct tag_object_nums *ton,
516 struct asf_object *cdo, struct asf_object *ecdo)
519 uint64_t sz; /* of the new header object */
520 uint32_t num_objects;
523 sz = 16 + 8 + 4 + 1 + 1; /* top-level header object */
524 for (i = 0; i < top->num_objects; i++) {
525 if (i == ton->content_descr_obj_num)
527 if (i == ton->extended_content_descr_obj_num)
529 sz += top->objects[i].size;
533 num_objects = top->num_objects;
534 if (ton->content_descr_obj_num < 0)
536 if (ton->extended_content_descr_obj_num < 0)
538 ret = xwrite(fd, top_level_header_object_guid, 16);
542 ret = xwrite(fd, tmp, 8);
545 write_u32(tmp, num_objects);
546 ret = xwrite(fd, tmp, 4);
549 write_u8(tmp, top->reserved1);
550 ret = xwrite(fd, tmp, 1);
553 write_u8(tmp, top->reserved2);
554 ret = xwrite(fd, tmp, 1);
558 * Write cto and ecto as objects 0 and 1 if they did not exist in the
561 if (ton->content_descr_obj_num < 0) {
562 ret = xwrite(fd, cdo->ptr, cdo->size);
566 if (ton->extended_content_descr_obj_num < 0) {
567 ret = xwrite(fd, ecdo->ptr, ecdo->size);
572 for (i = 0; i < top->num_objects; i++) {
573 char *buf = top->objects[i].ptr;
574 sz = top->objects[i].size;
575 if (i == ton->content_descr_obj_num) {
578 } else if (i == ton->extended_content_descr_obj_num) {
582 ret = xwrite(fd, buf, sz);
586 ret = xwrite(fd, map + top->size, mapsize - top->size);
591 static int wma_rewrite_tags(const char *map, size_t mapsize,
592 struct taginfo *tags, int fd,
593 __a_unused const char *filename)
595 struct afs_top_level_header_object top;
596 struct tag_object_nums ton = {-1, -1};
598 /* (extended) content description object */
599 struct asf_object cdo = {.ptr = NULL}, ecdo = {.ptr = NULL};
602 /* guid + size + num_objects + 2 * reserved */
603 if (mapsize < 16 + 8 + 4 + 1 + 1)
605 if (memcmp(map, top_level_header_object_guid, 16))
608 top.size = read_u64(p);
609 PARA_INFO_LOG("header_size: %lu\n", (long unsigned)top.size);
610 if (top.size >= mapsize)
613 top.num_objects = read_u32(p);
614 PARA_NOTICE_LOG("%u header objects\n", top.num_objects);
615 if (top.num_objects > top.size / 24)
618 top.reserved1 = read_u8(p);
620 top.reserved2 = read_u8(p);
621 if (top.reserved2 != 2)
623 p++; /* objects start at p */
624 top.objects = para_malloc(top.num_objects * sizeof(struct asf_object));
625 ret = read_asf_objects(p, top.size - (p - map), top.num_objects,
629 ret = make_cdo(tags, ton.content_descr_obj_num >= 0?
630 top.objects + ton.content_descr_obj_num : NULL, &cdo);
633 ret = make_ecdo(tags, &ecdo);
636 ret = write_output_file(fd, map, mapsize, &top, &ton, &cdo,
645 static const char * const wma_suffixes[] = {"wma", NULL};
648 * The init function of the wma audio format handler.
650 * \param afh Pointer to the struct to initialize.
652 void wma_afh_init(struct audio_format_handler *afh)
654 afh->get_file_info = wma_get_file_info;
655 afh->suffixes = wma_suffixes;
656 afh->rewrite_tags = wma_rewrite_tags;