apps/talk.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2004 Jörg Hohensohn
  11  *
  12  * This module collects the Talkbox and voice UI functions.
  13  * (Talkbox reads directory names from mp3 clips called thumbnails,
  14  *  the voice UI lets menus and screens "talk" from a voicefile in memory.
  15  *
  16  * All files in this archive are subject to the GNU General Public License.
  17  * See the file COPYING in the source tree root for full license agreement.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23
  24 #include <stdio.h>
  25 #include <stddef.h>
  26 #include <string.h>
  27 #include "file.h"
  28 #include "buffer.h"
  29 #include "system.h"
  30 #include "settings.h"
  31 #include "mp3_playback.h"
  32 #include "audio.h"
  33 #include "lang.h"
  34 #include "talk.h"
  35 #include "id3.h"
  36 #include "logf.h"
  37 #include "bitswap.h"
  38 #if CONFIG_CODEC == SWCODEC
  39 #include "playback.h"
  40 #endif
  41 #include "debug.h"
  42
  43
  44 /* Memory layout varies between targets because the
  45    Archos (MASCODEC) devices cannot mix voice and audio playback
  46
  47              MASCODEC  | MASCODEC  | SWCODEC
  48              (playing) | (stopped) |
  49     audiobuf-----------+-----------+-----------
  50               audio    | voice     | thumbnail
  51                        |-----------|----------- filebuf
  52                        | thumbnail | voice
  53                        |           |-----------
  54                        |           | audio
  55   audiobufend----------+-----------+-----------
  56
  57   SWCODEC allocates dedicated buffers, MASCODEC reuses audiobuf. */
  58
  59
  60 /***************** Constants *****************/
  61
  62 #define QUEUE_SIZE 64 /* must be a power of two */
  63 #define QUEUE_MASK (QUEUE_SIZE-1)
  64 const char* const dir_thumbnail_name = "_dirname.talk";
  65 const char* const file_thumbnail_ext = ".talk";
  66
  67 /***************** Functional Macros *****************/
  68
  69 #define QUEUE_LEVEL ((queue_write - queue_read) & QUEUE_MASK)
  70
  71 #define LOADED_MASK 0x80000000 /* MSB */
  72
  73 #if CONFIG_CODEC == SWCODEC
  74 #define MAX_THUMBNAIL_BUFSIZE 32768
  75 #endif
  76
  77
  78 /***************** Data types *****************/
  79
  80 struct clip_entry /* one entry of the index table */
  81 {
  82     int offset; /* offset from start of voicefile file */
  83     int size; /* size of the clip */
  84 };
  85
  86 struct voicefile /* file format of our voice file */
  87 {
  88     int version; /* version of the voicefile */
  89     int table;   /* offset to index table, (=header size) */
  90     int id1_max; /* number of "normal" clips contained in above index */
  91     int id2_max; /* number of "voice only" clips contained in above index */
  92     struct clip_entry index[]; /* followed by the index tables */
  93     /* and finally the bitswapped mp3 clips, not visible here */
  94 };
  95
  96 struct queue_entry /* one entry of the internal queue */
  97 {
  98     unsigned char* buf;
  99     long len;
 100 };
 101
 102
 103 /***************** Globals *****************/
 104
 105 static unsigned char* p_thumbnail; /* buffer for thumbnail */
 106 static long size_for_thumbnail; /* leftover buffer size for it */
 107 static struct voicefile* p_voicefile; /* loaded voicefile */
 108 static bool has_voicefile; /* a voicefile file is present */
 109 static struct queue_entry queue[QUEUE_SIZE]; /* queue of scheduled clips */
 110 static int queue_write; /* write index of queue, by application */
 111 static int queue_read; /* read index of queue, by ISR context */
 112 static int sent; /* how many bytes handed over to playback, owned by ISR */
 113 static unsigned char curr_hd[3]; /* current frame header, for re-sync */
 114 static int filehandle = -1; /* global, so the MMC variant can keep the file open */
 115 static unsigned char* p_silence; /* VOICE_PAUSE clip, used for termination */
 116 static long silence_len; /* length of the VOICE_PAUSE clip */
 117 static unsigned char* p_lastclip; /* address of latest clip, for silence add */
 118 static unsigned long voicefile_size = 0; /* size of the loaded voice file */
 119 static unsigned char last_lang[MAX_FILENAME+1]; /* name of last used lang file (in talk_init) */
 120 static bool talk_initialized; /* true if talk_init has been called */
 121
 122 /***************** Private prototypes *****************/
 123
 124 static void load_voicefile(void);
 125 static void mp3_callback(unsigned char** start, int* size);
 126 static int shutup(void);
 127 static int queue_clip(unsigned char* buf, long size, bool enqueue);
 128 static int open_voicefile(void);
 129 static unsigned char* get_clip(long id, long* p_size);
 130
 131
 132 /***************** Private implementation *****************/
 133
 134 static int open_voicefile(void)
 135 {
 136     char buf[64];
 137     char* p_lang = "english"; /* default */
 138
 139     if ( global_settings.lang_file[0] &&
 140          global_settings.lang_file[0] != 0xff )
 141     {   /* try to open the voice file of the selected language */
 142         p_lang = (char *)global_settings.lang_file;
 143     }
 144
 145     snprintf(buf, sizeof(buf), ROCKBOX_DIR LANG_DIR "/%s.voice", p_lang);
 146
 147     return open(buf, O_RDONLY);
 148 }
 149
 150
 151 /* load the voice file into the mp3 buffer */
 152 static void load_voicefile(void)
 153 {
 154     int load_size;
 155     int got_size;
 156     int file_size;
 157 #if CONFIG_CODEC == SWCODEC
 158     int length, i;
 159     unsigned char *buf, temp;
 160 #endif
 161
 162     filehandle = open_voicefile();
 163     if (filehandle < 0) /* failed to open */
 164         goto load_err;
 165
 166     file_size = filesize(filehandle);
 167     if (file_size > audiobufend - audiobuf) /* won't fit? */
 168        goto load_err;
 169
 170 #ifdef HAVE_MMC /* load only the header for now */
 171     load_size = offsetof(struct voicefile, index);
 172 #else /* load the full file */
 173     load_size = file_size;
 174 #endif
 175
 176     got_size = read(filehandle, audiobuf, load_size);
 177     if (got_size != load_size /* failure */)
 178         goto load_err;
 179
 180 #ifdef ROCKBOX_LITTLE_ENDIAN
 181     logf("Byte swapping voice file");
 182     p_voicefile = (struct voicefile*)audiobuf;
 183     p_voicefile->version = swap32(p_voicefile->version);
 184     p_voicefile->table = swap32(p_voicefile->table);
 185     p_voicefile->id1_max = swap32(p_voicefile->id1_max);
 186     p_voicefile->id2_max = swap32(p_voicefile->id2_max);
 187     p_voicefile = NULL;
 188 #endif
 189
 190     if (((struct voicefile*)audiobuf)->table /* format check */
 191            == offsetof(struct voicefile, index))
 192     {
 193         p_voicefile = (struct voicefile*)audiobuf;
 194
 195 #if CONFIG_CODEC != SWCODEC
 196         /* MASCODEC: now use audiobuf for voice then thumbnail */
 197         p_thumbnail = audiobuf + file_size;
 198         p_thumbnail += (long)p_thumbnail % 2; /* 16-bit align */
 199         size_for_thumbnail = audiobufend - p_thumbnail;
 200 #endif
 201     }
 202     else
 203        goto load_err;
 204
 205 #ifdef ROCKBOX_LITTLE_ENDIAN
 206     for (i = 0; i < p_voicefile->id1_max + p_voicefile->id2_max; i++)
 207     {
 208         struct clip_entry *ce;
 209         ce = &p_voicefile->index[i];
 210         ce->offset = swap32(ce->offset);
 211         ce->size = swap32(ce->size);
 212     }
 213 #endif
 214
 215     /* Do a bitswap as necessary. */
 216 #if CONFIG_CODEC == SWCODEC
 217     logf("Bitswapping voice file.");
 218     cpu_boost(true);
 219     buf = (unsigned char *)(&p_voicefile->index) +
 220         (p_voicefile->id1_max + p_voicefile->id2_max) * sizeof(struct clip_entry);
 221     length = file_size - (buf - (unsigned char *) p_voicefile);
 222
 223     for (i = 0; i < length; i++)
 224     {
 225         temp   = buf[i];
 226         temp   = ((temp >> 4) & 0x0f) | ((temp & 0x0f) << 4);
 227         temp   = ((temp >> 2) & 0x33) | ((temp & 0x33) << 2);
 228         buf[i] = ((temp >> 1) & 0x55) | ((temp & 0x55) << 1);
 229     }
 230     cpu_boost(false);
 231
 232 #endif
 233
 234 #ifdef HAVE_MMC
 235     /* load the index table, now that we know its size from the header */
 236     load_size = (p_voicefile->id1_max + p_voicefile->id2_max)
 237                 * sizeof(struct clip_entry);
 238     got_size = read(filehandle,
 239                     (unsigned char *) p_voicefile + offsetof(struct voicefile, index), load_size);
 240     if (got_size != load_size) /* read error */
 241        goto load_err;
 242 #else
 243     close(filehandle); /* only the MMC variant leaves it open */
 244     filehandle = -1;
 245 #endif
 246
 247     /* make sure to have the silence clip, if available */
 248     p_silence = get_clip(VOICE_PAUSE, &silence_len);
 249
 250     return;
 251
 252 load_err:
 253     p_voicefile = NULL;
 254     has_voicefile = false; /* don't try again */
 255     if (filehandle >= 0)
 256     {
 257         close(filehandle);
 258         filehandle = -1;
 259     }
 260     return;
 261 }
 262
 263
 264 /* called in ISR context if mp3 data got consumed */
 265 static void mp3_callback(unsigned char** start, int* size)
 266 {
 267     queue[queue_read].len -= sent; /* we completed this */
 268     queue[queue_read].buf += sent;
 269
 270     if (queue[queue_read].len > 0) /* current clip not finished? */
 271     {   /* feed the next 64K-1 chunk */
 272 #if CONFIG_CODEC != SWCODEC
 273         sent = MIN(queue[queue_read].len, 0xFFFF);
 274 #else
 275         sent = queue[queue_read].len;
 276 #endif
 277         *start = queue[queue_read].buf;
 278         *size = sent;
 279         return;
 280     }
 281     else if (sent > 0) /* go to next entry */
 282     {
 283         queue_read = (queue_read + 1) & QUEUE_MASK;
 284     }
 285
 286 re_check:
 287
 288     if (QUEUE_LEVEL) /* queue is not empty? */
 289     {   /* start next clip */
 290 #if CONFIG_CODEC != SWCODEC
 291         sent = MIN(queue[queue_read].len, 0xFFFF);
 292 #else
 293         sent = queue[queue_read].len;
 294 #endif
 295         *start = p_lastclip = queue[queue_read].buf;
 296         *size = sent;
 297         curr_hd[0] = p_lastclip[1];
 298         curr_hd[1] = p_lastclip[2];
 299         curr_hd[2] = p_lastclip[3];
 300     }
 301     else if (p_silence != NULL             /* silence clip available */
 302              && p_lastclip != p_silence    /* previous clip wasn't silence */
 303              && p_lastclip != p_thumbnail) /* ..or thumbnail */
 304     {   /* add silence clip when queue runs empty playing a voice clip */
 305         queue[queue_write].buf = p_silence;
 306         queue[queue_write].len = silence_len;
 307         queue_write = (queue_write + 1) & QUEUE_MASK;
 308
 309         goto re_check;
 310     }
 311     else
 312     {
 313         *size = 0; /* end of data */
 314         mp3_play_stop(); /* fixme: should be done by caller */
 315     }
 316 }
 317
 318 /* stop the playback and the pending clips, but at frame boundary */
 319 static int shutup(void)
 320 {
 321     unsigned char* pos;
 322     unsigned char* search;
 323     unsigned char* end;
 324
 325     if (QUEUE_LEVEL == 0) /* has ended anyway */
 326     {
 327         return 0;
 328     }
 329 #if CONFIG_CPU == SH7034
 330     CHCR3 &= ~0x0001; /* disable the DMA (and therefore the interrupt also) */
 331 #endif
 332     /* search next frame boundary and continue up to there */
 333     pos = search = mp3_get_pos();
 334     end = queue[queue_read].buf + queue[queue_read].len;
 335
 336     if (pos >= queue[queue_read].buf
 337         && pos <= end) /* really our clip? */
 338     { /* (for strange reasons this isn't nesessarily the case) */
 339         /* find the next frame boundary */
 340         while (search < end) /* search the remaining data */
 341         {
 342             if (*search++ != 0xFF) /* quick search for frame sync byte */
 343                 continue; /* (this does the majority of the job) */
 344
 345             /* look at the (bitswapped) rest of header candidate */
 346             if (search[0] == curr_hd[0] /* do the quicker checks first */
 347              && search[2] == curr_hd[2]
 348              && (search[1] & 0x30) == (curr_hd[1] & 0x30)) /* sample rate */
 349             {
 350                 search--; /* back to the sync byte */
 351                 break; /* From looking at it, this is our header. */
 352             }
 353         }
 354
 355         if (search-pos)
 356         {   /* play old data until the frame end, to keep the MAS in sync */
 357             sent = search-pos;
 358
 359             queue_write = (queue_read + 1) & QUEUE_MASK; /* will be empty after next callback */
 360             queue[queue_read].len = sent; /* current one ends after this */
 361
 362 #if CONFIG_CPU == SH7034
 363             DTCR3 = sent; /* let the DMA finish this frame */
 364             CHCR3 |= 0x0001; /* re-enable DMA */
 365 #endif
 366             return 0;
 367         }
 368     }
 369
 370     /* nothing to do, was frame boundary or not our clip */
 371     mp3_play_stop();
 372     queue_write = queue_read = 0; /* reset the queue */
 373
 374     return 0;
 375 }
 376
 377
 378 /* schedule a clip, at the end or discard the existing queue */
 379 static int queue_clip(unsigned char* buf, long size, bool enqueue)
 380 {
 381     int queue_level;
 382
 383     if (!enqueue)
 384         shutup(); /* cut off all the pending stuff */
 385
 386     if (!size)
 387         return 0; /* safety check */
 388 #if CONFIG_CPU == SH7034
 389     /* disable the DMA temporarily, to be safe of race condition */
 390     CHCR3 &= ~0x0001;
 391 #endif
 392     queue_level = QUEUE_LEVEL; /* check old level */
 393
 394     if (queue_level < QUEUE_SIZE - 1) /* space left? */
 395     {
 396         queue[queue_write].buf = buf; /* populate an entry */
 397         queue[queue_write].len = size;
 398         queue_write = (queue_write + 1) & QUEUE_MASK;
 399     }
 400
 401     if (queue_level == 0)
 402     {   /* queue was empty, we have to do the initial start */
 403         p_lastclip = buf;
 404 #if CONFIG_CODEC != SWCODEC
 405         sent = MIN(size, 0xFFFF); /* DMA can do no more */
 406 #else
 407         sent = size;
 408 #endif
 409         mp3_play_data(buf, sent, mp3_callback);
 410         curr_hd[0] = buf[1];
 411         curr_hd[1] = buf[2];
 412         curr_hd[2] = buf[3];
 413         mp3_play_pause(true); /* kickoff audio */
 414     }
 415     else
 416     {
 417 #if CONFIG_CPU == SH7034
 418         CHCR3 |= 0x0001; /* re-enable DMA */
 419 #endif
 420     }
 421
 422     return 0;
 423 }
 424
 425 /* fetch a clip from the voice file */
 426 static unsigned char* get_clip(long id, long* p_size)
 427 {
 428     long clipsize;
 429     unsigned char* clipbuf;
 430
 431     if (id > VOICEONLY_DELIMITER)
 432     {   /* voice-only entries use the second part of the table */
 433         id -= VOICEONLY_DELIMITER + 1;
 434         if (id >= p_voicefile->id2_max)
 435             return NULL; /* must be newer than we have */
 436         id += p_voicefile->id1_max; /* table 2 is behind table 1 */
 437     }
 438     else
 439     {   /* normal use of the first table */
 440         if (id >= p_voicefile->id1_max)
 441             return NULL; /* must be newer than we have */
 442     }
 443
 444     clipsize = p_voicefile->index[id].size;
 445     if (clipsize == 0) /* clip not included in voicefile */
 446         return NULL;
 447     clipbuf = (unsigned char *) p_voicefile + p_voicefile->index[id].offset;
 448
 449 #ifdef HAVE_MMC /* dynamic loading, on demand */
 450     if (!(clipsize & LOADED_MASK))
 451     {   /* clip used for the first time, needs loading */
 452         lseek(filehandle, p_voicefile->index[id].offset, SEEK_SET);
 453         if (read(filehandle, clipbuf, clipsize) != clipsize)
 454             return NULL; /* read error */
 455
 456         p_voicefile->index[id].size |= LOADED_MASK; /* mark as loaded */
 457     }
 458     else
 459     {   /* clip is in memory already */
 460         clipsize &= ~LOADED_MASK; /* without the extra bit gives true size */
 461     }
 462 #endif
 463
 464     *p_size = clipsize;
 465     return clipbuf;
 466 }
 467
 468
 469 /* common code for talk_init() and talk_buffer_steal() */
 470 static void reset_state(void)
 471 {
 472     queue_write = queue_read = 0; /* reset the queue */
 473     p_voicefile = NULL; /* indicate no voicefile (trashed) */
 474 #if CONFIG_CODEC == SWCODEC
 475     /* Allocate a dedicated thumbnail buffer */
 476     size_for_thumbnail = audiobufend - audiobuf;
 477     if (size_for_thumbnail > MAX_THUMBNAIL_BUFSIZE)
 478         size_for_thumbnail = MAX_THUMBNAIL_BUFSIZE;
 479     p_thumbnail = buffer_alloc(size_for_thumbnail);
 480 #else
 481     /* Just use the audiobuf, without allocating anything */
 482     p_thumbnail = audiobuf;
 483     size_for_thumbnail = audiobufend - audiobuf;
 484 #endif
 485     p_silence = NULL; /* pause clip not accessible */
 486 }
 487
 488 /***************** Public implementation *****************/
 489
 490 void talk_init(void)
 491 {
 492     if (talk_initialized && !strcasecmp(last_lang, global_settings.lang_file))
 493     {
 494         /* not a new file, nothing to do */
 495         return;
 496     }
 497
 498 #ifdef HAVE_MMC
 499     if (filehandle >= 0) /* MMC: An old voice file might still be open */
 500     {
 501         close(filehandle);
 502         filehandle = -1;
 503     }
 504 #endif
 505
 506     talk_initialized = true;
 507     strncpy((char *) last_lang, (char *)global_settings.lang_file,
 508         MAX_FILENAME);
 509
 510 #if CONFIG_CODEC == SWCODEC
 511     audio_stop();
 512 #endif
 513     reset_state(); /* use this for most of our inits */
 514
 515     filehandle = open_voicefile();
 516     has_voicefile = (filehandle >= 0); /* test if we can open it */
 517     voicefile_size = 0;
 518
 519     if (has_voicefile)
 520     {
 521         voicefile_size = filesize(filehandle);
 522 #if CONFIG_CODEC == SWCODEC
 523         voice_init();
 524 #endif
 525         close(filehandle); /* close again, this was just to detect presence */
 526         filehandle = -1;
 527     }
 528
 529 }
 530
 531 /* return if a voice codec is required or not */
 532 bool talk_voice_required(void)
 533 {
 534     return (voicefile_size != 0) /* Voice file is available */
 535         || (global_settings.talk_dir == 3)  /* Thumbnail clips are required */
 536         || (global_settings.talk_file == 3);
 537 }
 538
 539 /* return size of voice file */
 540 int talk_get_bufsize(void)
 541 {
 542     return voicefile_size;
 543 }
 544
 545 /* somebody else claims the mp3 buffer, e.g. for regular play/record */
 546 int talk_buffer_steal(void)
 547 {
 548     mp3_play_stop();
 549 #ifdef HAVE_MMC
 550     if (filehandle >= 0) /* only relevant for MMC */
 551     {
 552         close(filehandle);
 553         filehandle = -1;
 554     }
 555 #endif
 556     reset_state();
 557     return 0;
 558 }
 559
 560
 561 /* play a voice ID from voicefile */
 562 int talk_id(long id, bool enqueue)
 563 {
 564     long clipsize;
 565     unsigned char* clipbuf;
 566     int unit;
 567
 568 #if CONFIG_CODEC != SWCODEC
 569     if (audio_status()) /* busy, buffer in use */
 570         return -1;
 571 #endif
 572
 573     if (p_voicefile == NULL && has_voicefile)
 574         load_voicefile(); /* reload needed */
 575
 576     if (p_voicefile == NULL) /* still no voices? */
 577         return -1;
 578
 579     if (id == -1) /* -1 is an indication for silence */
 580         return -1;
 581
 582     /* check if this is a special ID, with a value */
 583     unit = ((unsigned long)id) >> UNIT_SHIFT;
 584     if (unit)
 585     {   /* sign-extend the value */
 586         id = (unsigned long)id << (32-UNIT_SHIFT);
 587         id >>= (32-UNIT_SHIFT);
 588         talk_value(id, unit, enqueue); /* speak it */
 589         return 0; /* and stop, end of special case */
 590     }
 591
 592     clipbuf = get_clip(id, &clipsize);
 593     if (clipbuf == NULL)
 594         return -1; /* not present */
 595
 596     queue_clip(clipbuf, clipsize, enqueue);
 597
 598     return 0;
 599 }
 600
 601
 602 /* play a thumbnail from file */
 603 int talk_file(const char* filename, bool enqueue)
 604 {
 605     int fd;
 606     int size;
 607     struct mp3entry info;
 608
 609 #if CONFIG_CODEC != SWCODEC
 610     if (audio_status()) /* busy, buffer in use */
 611         return -1;
 612 #endif
 613
 614     if (p_thumbnail == NULL || size_for_thumbnail <= 0)
 615         return -1;
 616
 617     if(mp3info(&info, filename, false)) /* use this to find real start */
 618     {
 619         return 0; /* failed to open, or invalid */
 620     }
 621
 622     fd = open(filename, O_RDONLY);
 623     if (fd < 0) /* failed to open */
 624     {
 625         return 0;
 626     }
 627
 628     lseek(fd, info.first_frame_offset, SEEK_SET); /* behind ID data */
 629
 630     size = read(fd, p_thumbnail, size_for_thumbnail);
 631     close(fd);
 632
 633     /* ToDo: find audio, skip ID headers and trailers */
 634
 635     if (size != 0 && size != size_for_thumbnail)    /* Don't play missing or truncated clips */
 636     {
 637 #if CONFIG_CODEC != SWCODEC
 638         bitswap(p_thumbnail, size);
 639 #endif
 640         queue_clip(p_thumbnail, size, enqueue);
 641     }
 642
 643     return size;
 644 }
 645
 646
 647 /* say a numeric value, this word ordering works for english,
 648    but not necessarily for other languages (e.g. german) */
 649 int talk_number(long n, bool enqueue)
 650 {
 651     int level = 2; /* mille count */
 652     long mil = 1000000000; /* highest possible "-illion" */
 653
 654 #if CONFIG_CODEC != SWCODEC
 655     if (audio_status()) /* busy, buffer in use */
 656         return -1;
 657 #endif
 658
 659     if (!enqueue)
 660         shutup(); /* cut off all the pending stuff */
 661
 662     if (n==0)
 663     {   /* special case */
 664         talk_id(VOICE_ZERO, true);
 665         return 0;
 666     }
 667
 668     if (n<0)
 669     {
 670         talk_id(VOICE_MINUS, true);
 671         n = -n;
 672     }
 673
 674     while (n)
 675     {
 676         int segment = n / mil; /* extract in groups of 3 digits */
 677         n -= segment * mil; /* remove the used digits from number */
 678         mil /= 1000; /* digit place for next round */
 679
 680         if (segment)
 681         {
 682             int hundreds = segment / 100;
 683             int ones = segment % 100;
 684
 685             if (hundreds)
 686             {
 687                 talk_id(VOICE_ZERO + hundreds, true);
 688                 talk_id(VOICE_HUNDRED, true);
 689             }
 690
 691             /* combination indexing */
 692             if (ones > 20)
 693             {
 694                int tens = ones/10 + 18;
 695                talk_id(VOICE_ZERO + tens, true);
 696                ones %= 10;
 697             }
 698
 699             /* direct indexing */
 700             if (ones)
 701                 talk_id(VOICE_ZERO + ones, true);
 702
 703             /* add billion, million, thousand */
 704             if (mil)
 705                 talk_id(VOICE_THOUSAND + level, true);
 706         }
 707         level--;
 708     }
 709
 710     return 0;
 711 }
 712
 713 /* singular/plural aware saying of a value */
 714 int talk_value(long n, int unit, bool enqueue)
 715 {
 716     int unit_id;
 717     static const int unit_voiced[] =
 718     {   /* lookup table for the voice ID of the units */
 719         -1, -1, -1, /* regular ID, int, signed */
 720         VOICE_MILLISECONDS, /* here come the "real" units */
 721         VOICE_SECONDS,
 722         VOICE_MINUTES,
 723         VOICE_HOURS,
 724         VOICE_KHZ,
 725         VOICE_DB,
 726         VOICE_PERCENT,
 727         VOICE_MILLIAMPHOURS,
 728         VOICE_PIXEL,
 729         VOICE_PER_SEC,
 730         VOICE_HERTZ,
 731     };
 732
 733 #if CONFIG_CODEC != SWCODEC
 734     if (audio_status()) /* busy, buffer in use */
 735         return -1;
 736 #endif
 737
 738     if (unit < 0 || unit >= UNIT_LAST)
 739         unit_id = -1;
 740     else
 741         unit_id = unit_voiced[unit];
 742
 743     if ((n==1 || n==-1) /* singular? */
 744         && unit_id >= VOICE_SECONDS && unit_id <= VOICE_HOURS)
 745     {
 746         unit_id--; /* use the singular for those units which have */
 747     }
 748
 749     /* special case with a "plus" before */
 750     if (n > 0 && (unit == UNIT_SIGNED || unit == UNIT_DB))
 751     {
 752         talk_id(VOICE_PLUS, enqueue);
 753         enqueue = true;
 754     }
 755
 756     talk_number(n, enqueue); /* say the number */
 757     talk_id(unit_id, true); /* say the unit, if any */
 758
 759     return 0;
 760 }
 761
 762 /* spell a string */
 763 int talk_spell(const char* spell, bool enqueue)
 764 {
 765     char c; /* currently processed char */
 766
 767 #if CONFIG_CODEC != SWCODEC
 768     if (audio_status()) /* busy, buffer in use */
 769         return -1;
 770 #endif
 771
 772     if (!enqueue)
 773         shutup(); /* cut off all the pending stuff */
 774
 775     while ((c = *spell++) != '\0')
 776     {
 777         /* if this grows into too many cases, I should use a table */
 778         if (c >= 'A' && c <= 'Z')
 779             talk_id(VOICE_CHAR_A + c - 'A', true);
 780         else if (c >= 'a' && c <= 'z')
 781             talk_id(VOICE_CHAR_A + c - 'a', true);
 782         else if (c >= '0' && c <= '9')
 783             talk_id(VOICE_ZERO + c - '0', true);
 784         else if (c == '-')
 785             talk_id(VOICE_MINUS, true);
 786         else if (c == '+')
 787             talk_id(VOICE_PLUS, true);
 788         else if (c == '.')
 789             talk_id(VOICE_DOT, true);
 790         else if (c == ' ')
 791             talk_id(VOICE_PAUSE, true);
 792     }
 793
 794     return 0;
 795 }