mp3_afh.c

   1 /*
   2  * Copyright (C) 2003 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file mp3_afh.c para_server's mp3 audio format handler */
   8
   9 /*
  10  * This file is based in part on mp3tech.c and mp3tech.h, Copyright (C)
  11  * 2000-2001 Cedric Tefft <cedric@earthling.net>, which in turn is based
  12  * in part on
  13  *
  14  *      * MP3Info 0.5 by Ricardo Cerqueira <rmc@rccn.net>
  15  *      * MP3Stat 0.9 by Ed Sweetman <safemode@voicenet.com> and
  16  *                       Johannes Overmann <overmann@iname.com>
  17  */
  18
  19 #include <regex.h>
  20
  21 #include "para.h"
  22 #include "error.h"
  23 #include "afh.h"
  24 #include "string.h"
  25 #include "fd.h"
  26
  27 /*
  28  * MIN_CONSEC_GOOD_FRAMES defines how many consecutive valid MP3 frames we need
  29  * to see before we decide we are looking at a real MP3 file
  30  */
  31 #define MIN_CONSEC_GOOD_FRAMES 4
  32 #define FRAME_HEADER_SIZE 4
  33 #define MIN_FRAME_SIZE 21
  34
  35 struct mp3header {
  36         unsigned long sync;
  37         unsigned int version;
  38         unsigned int layer;
  39         unsigned int crc;
  40         unsigned int bitrate;
  41         unsigned int freq;
  42         unsigned int padding;
  43         unsigned int mode;
  44         unsigned int copyright;
  45         unsigned int original;
  46         unsigned int emphasis;
  47 };
  48
  49 static const int frequencies[3][4] = {
  50         {22050,24000,16000,50000}, /* MPEG 2.0 */
  51         {44100,48000,32000,50000}, /* MPEG 1.0 */
  52         {11025,12000,8000,50000} /* MPEG 2.5 */
  53 };
  54
  55 static const int mp3info_bitrate[2][3][14] = {
  56 { /* MPEG 2.0 */
  57         {32,48,56,64,80,96,112,128,144,160,176,192,224,256}, /* layer 1 */
  58         {8,16,24,32,40,48,56,64,80,96,112,128,144,160}, /* layer 2 */
  59         {8,16,24,32,40,48,56,64,80,96,112,128,144,160} /* layer 3 */
  60 },
  61
  62 { /* MPEG 1.0 */
  63         {32,64,96,128,160,192,224,256,288,320,352,384,416,448}, /* layer 1 */
  64         {32,48,56,64,80,96,112,128,160,192,224,256,320,384}, /* layer 2 */
  65         {32,40,48,56,64,80,96,112,128,160,192,224,256,320} /* layer 3 */
  66 }
  67 };
  68
  69 static const int frame_size_index[] = {24000, 72000, 72000};
  70 static const char *mode_text[] = {"stereo", "joint stereo", "dual channel", "mono", "invalid"};
  71
  72 #ifdef HAVE_ID3TAG
  73
  74 #include <id3tag.h>
  75
  76 static char *get_utf8(id3_ucs4_t const *string)
  77 {
  78         if (!string)
  79                 return NULL;
  80         return (char *)id3_ucs4_utf8duplicate(string);
  81 }
  82
  83 static char *get_stringlist(union id3_field *field)
  84 {
  85         unsigned int k, nstrings = id3_field_getnstrings(field);
  86         char *result = NULL;
  87
  88         for (k = 0; k < nstrings; k++) {
  89                 char *tmp = (char *)get_utf8(id3_field_getstrings(field, k));
  90                 if (result) {
  91                         char *tmp2 = result;
  92                         result = make_message("%s %s", tmp2, tmp);
  93                         free(tmp);
  94                         free(tmp2);
  95                 } else
  96                         result = tmp;
  97         }
  98         return result;
  99 }
 100
 101 static char *get_string(union id3_field *field)
 102 {
 103         id3_ucs4_t const *string = id3_field_getfullstring(field);
 104
 105         return get_utf8(string);
 106 }
 107
 108 #define FOR_EACH_FIELD(f, j, fr) for (j = 0; j < (fr)->nfields && \
 109         (f = id3_frame_field((fr), j)); j++)
 110
 111 static char *get_strings(struct id3_frame *fr)
 112 {
 113         int j;
 114         union id3_field *field;
 115
 116         FOR_EACH_FIELD(field, j, fr) {
 117                 enum id3_field_type type = id3_field_type(field);
 118
 119                 if (type == ID3_FIELD_TYPE_STRINGLIST)
 120                         return get_stringlist(field);
 121                 if (type == ID3_FIELD_TYPE_STRINGFULL)
 122                         return get_string(field);
 123         }
 124         return NULL;
 125 }
 126
 127 /* this only sets values which are undefined so far */
 128 static void parse_frames(struct id3_tag *id3_t, struct taginfo *tags)
 129 {
 130         int i;
 131
 132         for (i = 0; i < id3_t->nframes; i++) {
 133                 struct id3_frame *fr = id3_t->frames[i];
 134                 if (!strcmp(fr->id, ID3_FRAME_TITLE)) {
 135                         if (!tags->title)
 136                                 tags->title = get_strings(fr);
 137                         continue;
 138                 }
 139                 if (!strcmp(fr->id, ID3_FRAME_ARTIST)) {
 140                         if (!tags->artist)
 141                                 tags->artist = get_strings(fr);
 142                         continue;
 143                 }
 144                 if (!strcmp(fr->id, ID3_FRAME_ALBUM)) {
 145                         if (!tags->album)
 146                                 tags->album = get_strings(fr);
 147                         continue;
 148                 }
 149                 if (!strcmp(fr->id, ID3_FRAME_YEAR)) {
 150                         if (!tags->year)
 151                                 tags->year = get_strings(fr);
 152                         continue;
 153                 }
 154                 if (!strcmp(fr->id, ID3_FRAME_COMMENT)) {
 155                         if (!tags->comment)
 156                                 tags->comment = get_strings(fr);
 157                         continue;
 158                 }
 159         }
 160 }
 161
 162 static int mp3_get_id3(unsigned char *map, size_t numbytes, __a_unused int fd,
 163                 struct taginfo *tags)
 164 {
 165         int ret = 0;
 166         struct id3_tag *id3_t;
 167
 168         /* id3v2 tags are usually located at the beginning. */
 169         id3_t = id3_tag_parse(map, numbytes);
 170         if (id3_t) {
 171                 parse_frames(id3_t, tags);
 172                 ret |= 2;
 173                 id3_tag_delete(id3_t);
 174         }
 175         /* Also look for an id3v1 tag at the end of the file. */
 176         if (numbytes >= 128) {
 177                 id3_t = id3_tag_parse(map + numbytes - 128, 128);
 178                 if (id3_t) {
 179                         parse_frames(id3_t, tags);
 180                         ret |= 1;
 181                         id3_tag_delete(id3_t);
 182                 }
 183         }
 184         return ret;
 185 }
 186
 187 /* These helpers are not mentioned in the libid3tag header file. */
 188 void id3_field_init(union id3_field *field, enum id3_field_type type);
 189 void id3_field_finish(union id3_field *field);
 190
 191 /*
 192  * Frames of type ID3_FRAME_COMMENT contain three fields of type language,
 193  * string, and fullstring. The third field contains the actual comment.
 194  */
 195 static int set_comment_fields(struct id3_frame *fr, id3_ucs4_t *ucs4_val)
 196 {
 197         int ret;
 198         union id3_field *field;
 199
 200         field = id3_frame_field(fr, 1);
 201         id3_field_init(field, ID3_FIELD_TYPE_LANGUAGE);
 202
 203         field = id3_frame_field(fr, 2);
 204         id3_field_init(field, ID3_FIELD_TYPE_STRING);
 205
 206         field = id3_frame_field(fr, 3);
 207         id3_field_init(field, ID3_FIELD_TYPE_STRINGFULL);
 208         ret = id3_field_setfullstring(field, ucs4_val);
 209         if (ret < 0)
 210                 return -E_ID3_SETSTRING;
 211         return 1;
 212 }
 213
 214 /*
 215  * UCS-4 stands for Universal Character Set where each character uses exactly
 216  * 32 bits. It is also known as UTF-32, see ISO 10646.
 217  *
 218  * We have to use UCS-4 as an intermediate representation because the functions
 219  * of libid3tag which set the tag content expect an array of UCS-4 characters.
 220  * Fortunately, libid3tag contains conversion functions from and to UTF-8.
 221  */
 222 static int replace_tag(char const *id, const char *val, struct id3_tag *id3_t,
 223                 int options)
 224 {
 225         int ret;
 226         struct id3_frame *fr;
 227         union id3_field *field;
 228         id3_ucs4_t *ucs4_val;
 229
 230         /* First, detach all frames that match the given id. */
 231         while ((fr = id3_tag_findframe(id3_t, id, 0))) {
 232                 PARA_INFO_LOG("deleting %s frame\n", id);
 233                 ret = id3_tag_detachframe(id3_t, fr);
 234                 if (ret < 0)
 235                         return -E_ID3_DETACH;
 236                 id3_frame_delete(fr);
 237         }
 238         if (!val || !*val)
 239                 return 0;
 240         fr = id3_frame_new(id);
 241         PARA_DEBUG_LOG("frame desc: %s, %d fields\n", fr->description, fr->nfields);
 242
 243         /* Frame 0 contains the encoding. We always use UTF-8. */
 244         field = id3_frame_field(fr, 0);
 245         id3_field_init(field, ID3_FIELD_TYPE_TEXTENCODING);
 246         ret = id3_field_settextencoding(field, ID3_FIELD_TEXTENCODING_UTF_8);
 247         if (ret < 0)
 248                 return -E_ID3_SETENCODING;
 249         /* create UCS-4 representation */
 250         ucs4_val = id3_utf8_ucs4duplicate((const id3_utf8_t *)val);
 251
 252         if (strcmp(id, ID3_FRAME_COMMENT) == 0)
 253                 ret = set_comment_fields(fr, ucs4_val);
 254         else {
 255                 /* Non-comment frames contain the value in field 1. */
 256                 field = id3_frame_field(fr, 1);
 257                 if (options & ID3_TAG_OPTION_ID3V1) {
 258                         id3_ucs4_t *ptr[] = {ucs4_val, NULL};
 259                         id3_field_init(field, ID3_FIELD_TYPE_STRINGLIST);
 260                         ret = id3_field_setstrings(field, 1, ptr);
 261                 } else {
 262                         id3_field_init(field, ID3_FIELD_TYPE_STRINGFULL);
 263                         ret = id3_field_setfullstring(field, ucs4_val);
 264                 }
 265         }
 266         free(ucs4_val);
 267         if (ret < 0)
 268                 return -E_ID3_SETSTRING;
 269
 270         PARA_INFO_LOG("attaching %s frame, value: %s\n", id, val);
 271         ret = id3_tag_attachframe(id3_t, fr);
 272         if (ret < 0)
 273                 return -E_ID3_ATTACH;
 274         return 1;
 275 }
 276
 277 static int replace_tags(struct id3_tag *id3_t, struct taginfo *tags)
 278 {
 279         int ret, options = id3_tag_options(id3_t, 0, 0);
 280
 281         ret = replace_tag(ID3_FRAME_ARTIST, tags->artist, id3_t, options);
 282         if (ret < 0)
 283                 return ret;
 284         ret = replace_tag(ID3_FRAME_TITLE, tags->title, id3_t, options);
 285         if (ret < 0)
 286                 return ret;
 287         ret = replace_tag(ID3_FRAME_ALBUM, tags->album, id3_t, options);
 288         if (ret < 0)
 289                 return ret;
 290         ret = replace_tag(ID3_FRAME_YEAR, tags->year, id3_t, options);
 291         if (ret < 0)
 292                 return ret;
 293         ret = replace_tag(ID3_FRAME_COMMENT, tags->comment, id3_t, options);
 294         if (ret < 0)
 295                 return ret;
 296         return 1;
 297 }
 298
 299 /* id3_tag_delete() does not seem to work due to refcount issues. */
 300 static void free_tag(struct id3_tag *id3_t)
 301 {
 302         int i, j;
 303         for (i = 0; i < id3_t->nframes; i++) {
 304                 struct id3_frame *fr = id3_t->frames[i];
 305                 for (j = 0; j < fr->nfields; j++) {
 306                         union id3_field *field = &fr->fields[j];
 307                         id3_field_finish(field);
 308                 }
 309                 free(fr);
 310         }
 311         free(id3_t->frames);
 312         free(id3_t);
 313 }
 314
 315 static int mp3_rewrite_tags(const char *map, size_t mapsize,
 316                 struct taginfo *tags, int fd, __a_unused const char *filename)
 317 {
 318         int ret;
 319         id3_length_t old_v2size, new_v2size;
 320         id3_byte_t v1_buffer[128], *v2_buffer;
 321         size_t data_sz;
 322         struct id3_tag *v1_tag = NULL, *v2_tag = NULL;
 323
 324         if (mapsize >= 128) {
 325                 v1_tag = id3_tag_parse((const id3_byte_t *)map + mapsize - 128,
 326                         128);
 327                 if (v1_tag) {
 328                         PARA_NOTICE_LOG("replacing id3v1 tag\n");
 329                         ret = replace_tags(v1_tag, tags);
 330                         if (ret < 0)
 331                                 goto out;
 332                         id3_tag_render(v1_tag, v1_buffer);
 333                 }
 334         }
 335         old_v2size = 0;
 336         v2_tag = id3_tag_parse((const id3_byte_t *)map, mapsize);
 337         if (v2_tag) {
 338                 PARA_NOTICE_LOG("replacing id3v2 tag\n");
 339                 old_v2size = v2_tag->paddedsize;
 340         } else if (!v1_tag) {
 341                 PARA_NOTICE_LOG("no id3 tags found, adding id3v2 tag\n");
 342                 v2_tag = id3_tag_new();
 343                 assert(v2_tag);
 344         }
 345         if (v2_tag) {
 346                 /*
 347                  * Turn off all options to avoid creating an extended header.
 348                  * id321 does not understand it.
 349                  */
 350                 id3_tag_options(v2_tag, ~0U, 0);
 351                 ret = replace_tags(v2_tag, tags);
 352                 if (ret < 0)
 353                         goto out;
 354                 new_v2size = id3_tag_render(v2_tag, NULL);
 355                 v2_buffer = para_malloc(new_v2size);
 356                 id3_tag_render(v2_tag, v2_buffer);
 357                 PARA_INFO_LOG("writing v2 tag (%lu bytes)\n", new_v2size);
 358                 ret = write_all(fd, (char *)v2_buffer, new_v2size);
 359                 free(v2_buffer);
 360                 if (ret < 0)
 361                         goto out;
 362         }
 363         data_sz = mapsize - old_v2size;
 364         if (v1_tag && data_sz >= 128)
 365                 data_sz -= 128;
 366         PARA_INFO_LOG("writing data part (%zu bytes)\n", data_sz);
 367         ret = write_all(fd, map + old_v2size, data_sz);
 368         if (ret < 0)
 369                 goto out;
 370         if (v1_tag) {
 371                 PARA_INFO_LOG("writing v1 tag\n");
 372                 ret = write_all(fd, (char *)v1_buffer, 128);
 373         }
 374 out:
 375         if (v1_tag)
 376                 free_tag(v1_tag);
 377         if (v2_tag)
 378                 free_tag(v2_tag);
 379         return ret;
 380 }
 381
 382 #else /* HAVE_ID3TAG */
 383
 384 /*
 385  * Remove trailing whitespace from the end of a string
 386  */
 387 static char *unpad(char *string)
 388 {
 389         char *pos = string + strlen(string) - 1;
 390         while (para_isspace(pos[0]))
 391                 (pos--)[0] = 0;
 392         return string;
 393 }
 394
 395 static int mp3_get_id3(unsigned char *map, size_t numbytes, __a_unused int fd,
 396         struct taginfo *tags)
 397 {
 398         char title[31], artist[31], album[31], year[5], comment[31];
 399         off_t fpos;
 400
 401         if (numbytes < 128 || strncmp("TAG", (char *)map + numbytes - 128, 3)) {
 402                 PARA_DEBUG_LOG("no id3 v1 tag\n");
 403                 return 0;
 404         }
 405         fpos = numbytes - 125;
 406         memcpy(title, map + fpos, 30);
 407         fpos += 30;
 408         title[30] = '\0';
 409         memcpy(artist, map + fpos, 30);
 410         fpos += 30;
 411         artist[30] = '\0';
 412         memcpy(album, map + fpos, 30);
 413         fpos += 30;
 414         album[30] = '\0';
 415         memcpy(year, map + fpos, 4);
 416         fpos += 4;
 417         year[4] = '\0';
 418         memcpy(comment, map + fpos, 30);
 419         comment[30] = '\0';
 420         unpad(title);
 421         unpad(artist);
 422         unpad(album);
 423         unpad(year);
 424         unpad(comment);
 425         tags->artist = para_strdup(artist);
 426         tags->title = para_strdup(title);
 427         tags->year = para_strdup(year);
 428         tags->album = para_strdup(album);
 429         tags->comment = para_strdup(comment);
 430         return 1;
 431 }
 432 #endif /* HAVE_ID3TAG */
 433
 434 static int header_frequency(struct mp3header *h)
 435 {
 436         if (h->version > 2 || h->freq > 3)
 437                 return -E_HEADER_FREQ;
 438         return frequencies[h->version][h->freq];
 439 }
 440
 441 static const char *header_mode(struct mp3header *h)
 442 {
 443         if (h->mode > 4)
 444                 h->mode = 4; /* invalid */
 445         return mode_text[h->mode];
 446 }
 447
 448 static int header_channels(struct mp3header *h)
 449 {
 450         if (h->mode > 3)
 451                 return 0;
 452         if (h->mode < 3)
 453                 return 2;
 454         return 1;
 455 }
 456
 457 static int header_bitrate(struct mp3header *h)
 458 {
 459         if (!h->layer || h->layer > 3 || h->bitrate > 14 || !h->bitrate)
 460                 return -E_HEADER_BITRATE;
 461         return mp3info_bitrate[h->version & 1][3 - h->layer][h->bitrate - 1];
 462 }
 463
 464 static int frame_length(struct mp3header *header)
 465 {
 466         int hb, hf = header_frequency(header);
 467
 468         if (hf < 0)
 469                 return hf;
 470         hb = header_bitrate(header);
 471         if (hb < 0)
 472                 return hb;
 473         if (header->sync != 0xFFE || header->layer > 3)
 474                 return -E_FRAME;
 475         return frame_size_index[3 - header->layer] *
 476                 ((header->version & 1) + 1) * hb / hf
 477                 + header->padding;
 478 }
 479
 480 static int compare_headers(struct mp3header *h1,struct mp3header *h2)
 481 {
 482         if ((*(unsigned int*)h1) == (*(unsigned int*)h2))
 483                 return 1;
 484         if ((h1->version == h2->version) &&
 485                         (h1->layer == h2->layer) &&
 486                         (h1->crc == h2->crc) &&
 487                         (h1->freq == h2->freq) &&
 488                         (h1->mode == h2->mode) &&
 489                         (h1->copyright == h2->copyright) &&
 490                         (h1->original == h2->original) &&
 491                         (h1->emphasis == h2->emphasis))
 492                 return 1;
 493         return 0;
 494 }
 495
 496 /*
 497  * get next MP3 frame header.
 498  *
 499  * On success, the header frame length is returned and the given header
 500  * structure that is filled in.  A return value of zero means that we did not
 501  * retrieve a valid frame header, and a negative return value indicates an
 502  * error.
 503  */
 504 static int get_header(unsigned char *map, size_t numbytes, off_t *fpos,
 505         struct mp3header *header)
 506 {
 507         int fl, ret;
 508
 509         if (*fpos + FRAME_HEADER_SIZE > numbytes) {
 510                 *fpos = numbytes - 1;
 511                 header->sync = 0;
 512                 return 0;
 513         }
 514         header->layer = (map[*fpos + 1] >> 1) & 3;
 515         header->sync = (((int)map[*fpos]<<4) | ((int)(map[*fpos + 1]&0xE0)>>4));
 516         if (map[*fpos + 1] & 0x10)
 517                 header->version = (map[*fpos + 1] >> 3) & 1;
 518         else
 519                 header->version = 2;
 520         if ((header->sync != 0xFFE) || (header->layer != 1)) {
 521                 ret = 0;
 522                 header->sync = 0;
 523                 goto out;
 524         }
 525         header->crc = map[*fpos + 1] & 1;
 526         header->bitrate = (map[*fpos + 2] >> 4) & 0x0F;
 527         header->freq = (map[*fpos + 2] >> 2) & 0x3;
 528         header->padding = (map[*fpos + 2] >>1) & 0x1;
 529         header->mode = (map[*fpos + 3] >> 6) & 0x3;
 530         fl = frame_length(header);
 531         ret = (fl >= MIN_FRAME_SIZE)? fl : -E_FRAME_LENGTH;
 532 out:
 533         *fpos += FRAME_HEADER_SIZE;
 534         return ret;
 535 }
 536
 537 /*
 538  * find the next mp3 header
 539  *
 540  * Return the length of the next frame header or zero if the end of the file is
 541  * reached.
 542  */
 543 static int mp3_seek_next_header(unsigned char *map, size_t numbytes, off_t *fpos,
 544         struct mp3header *result)
 545 {
 546         int k, l = 0, first_len;
 547         struct mp3header h, h2;
 548         long valid_start = 0;
 549
 550         for (; *fpos < numbytes; (*fpos)++) {
 551                 if (map[*fpos] != 0xff)
 552                         continue;
 553                 valid_start = *fpos;
 554                 first_len = get_header(map, numbytes, fpos, &h);
 555                 if (first_len <= 0)
 556                         continue;
 557                 *fpos += first_len - FRAME_HEADER_SIZE;
 558                 for (k = 1; k < MIN_CONSEC_GOOD_FRAMES; k++) {
 559                         if ((l = get_header(map, numbytes, fpos, &h2)) <= 0)
 560                                 break;
 561                         if (!compare_headers(&h, &h2))
 562                                 break;
 563                         *fpos += l - FRAME_HEADER_SIZE;
 564                 }
 565                 if (k == MIN_CONSEC_GOOD_FRAMES) {
 566                         *fpos = valid_start;
 567                         *result = h2;
 568                         return first_len;
 569                 }
 570         }
 571         return 0;
 572 }
 573
 574 static int find_valid_start(unsigned char *map, size_t numbytes, off_t *fpos,
 575         struct mp3header *header)
 576 {
 577         int frame_len;
 578
 579         frame_len = get_header(map, numbytes, fpos, header);
 580         if (frame_len < 0)
 581                 return frame_len;
 582         if (!frame_len) {
 583                 frame_len = mp3_seek_next_header(map, numbytes, fpos, header);
 584                 if (frame_len <= 0)
 585                         return frame_len;
 586         } else
 587                 *fpos -= FRAME_HEADER_SIZE;
 588         if (frame_len <= 1)
 589                 return -E_FRAME_LENGTH;
 590         return frame_len;
 591 }
 592
 593 static int mp3_read_info(unsigned char *map, size_t numbytes, int fd,
 594                 struct afh_info *afhi)
 595 {
 596         uint64_t freq_sum = 0, br_sum = 0;
 597         int fl = 0, ret, len = 0, old_br = -1, vbr = 0;
 598         struct timeval total_time = {0, 0};
 599         unsigned chunk_table_size = 1000; /* gets increased on demand */
 600         off_t fpos = 0;
 601         struct mp3header header;
 602         const char *tag_versions[] = {"no", "id3v1", "id3v2", "id3v1+id3v2"};
 603
 604         afhi->chunks_total = 0;
 605         afhi->chunk_table = para_malloc(chunk_table_size * sizeof(uint32_t));
 606         while (1) {
 607                 int freq, br;
 608                 struct timeval tmp, cct; /* current chunk time */
 609                 fpos += len;
 610                 len = find_valid_start(map, numbytes, &fpos, &header);
 611                 if (len <= 0) {
 612                         size_t end;
 613                         ret = -E_MP3_INFO;
 614                         if (!afhi->chunks_total)
 615                                 goto err_out;
 616                         end = afhi->chunk_table[afhi->chunks_total - 1] + fl;
 617                         afhi->chunk_table[afhi->chunks_total]
 618                                 = PARA_MIN(end, numbytes);
 619                         break;
 620                 }
 621                 ret = header_frequency(&header);
 622                 if (ret < 0)
 623                         continue;
 624                 freq = ret;
 625                 ret = header_bitrate(&header);
 626                 if (ret < 0)
 627                         continue;
 628                 br = ret;
 629                 ret = frame_length(&header);
 630                 if (ret < 0)
 631                         continue;
 632                 fl = ret;
 633                 tmp.tv_sec = fl - header.padding;
 634                 tmp.tv_usec = 0;
 635                 tv_divide(br * 125, &tmp, &cct);
 636                 tv_add(&cct, &total_time, &tmp);
 637                 total_time = tmp;
 638                 if (afhi->chunks_total >= chunk_table_size) {
 639                         chunk_table_size *= 2;
 640                         afhi->chunk_table = para_realloc(afhi->chunk_table,
 641                                 chunk_table_size * sizeof(uint32_t));
 642                 }
 643                 afhi->chunk_table[afhi->chunks_total] = fpos;
 644                 afhi->chunks_total++;
 645                 freq_sum += freq;
 646                 br_sum += br;
 647                 if (afhi->chunks_total != 1 && old_br != br)
 648                         vbr = 1;
 649                 old_br = br;
 650         }
 651         ret = -E_MP3_INFO;
 652         if (!freq_sum || !br_sum)
 653                 goto err_out;
 654         afhi->bitrate = br_sum / afhi->chunks_total;
 655         afhi->frequency = freq_sum / afhi->chunks_total;
 656         afhi->channels = header_channels(&header);
 657         afhi->seconds_total = (tv2ms(&total_time) + 500) / 1000;
 658         tv_divide(afhi->chunks_total, &total_time, &afhi->chunk_tv);
 659         PARA_DEBUG_LOG("%" PRIu32 "chunks, each %lums\n", afhi->chunks_total,
 660                 tv2ms(&afhi->chunk_tv));
 661         ret = mp3_get_id3(map, numbytes, fd, &afhi->tags);
 662         afhi->techinfo = make_message("%cbr, %s, %s tags", vbr? 'v' : 'c',
 663                 header_mode(&header), tag_versions[ret]);
 664         return 1;
 665 err_out:
 666         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 667         free(afhi->chunk_table);
 668         return ret;
 669 }
 670
 671 /*
 672  * Read mp3 information from audio file
 673  */
 674 static int mp3_get_file_info(char *map, size_t numbytes, int fd,
 675                 struct afh_info *afhi)
 676 {
 677         int ret;
 678
 679         ret = mp3_read_info((unsigned char *)map, numbytes, fd, afhi);
 680         if (ret < 0)
 681                 return ret;
 682         if (afhi->seconds_total < 2 || !afhi->chunks_total)
 683                 return -E_MP3_INFO;
 684         return 1;
 685 }
 686
 687 static const char* mp3_suffixes[] = {"mp3", NULL};
 688
 689 /**
 690  * the init function of the mp3 audio format handler
 691  *
 692  * \param afh pointer to the struct to initialize
 693  */
 694 void mp3_init(struct audio_format_handler *afh)
 695 {
 696         afh->get_file_info = mp3_get_file_info;
 697         afh->suffixes = mp3_suffixes;
 698 #ifdef HAVE_LIBID3TAG
 699         afh->rewrite_tags = mp3_rewrite_tags;
 700 #endif /* HAVE_LIBID3TAG */
 701 }