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 "kernel.h"
  31 #include "settings.h"
  32 #include "mp3_playback.h"
  33 #include "audio.h"
  34 #include "lang.h"
  35 #include "talk.h"
  36 #include "id3.h"
  37 #include "logf.h"
  38 #include "bitswap.h"
  39 #include "structec.h"
  40 #if CONFIG_CODEC == SWCODEC
  41 #include "playback.h"
  42 #endif
  43 #include "debug.h"
  44
  45
  46 /* Memory layout varies between targets because the
  47    Archos (MASCODEC) devices cannot mix voice and audio playback
  48
  49              MASCODEC  | MASCODEC  | SWCODEC
  50              (playing) | (stopped) |
  51     audiobuf-----------+-----------+------------
  52               audio    | voice     | thumbnail
  53                        |-----------|------------
  54                        | thumbnail | voice
  55                        |           |------------
  56                        |           | filebuf
  57                        |           |------------
  58                        |           | audio
  59                        |           |------------
  60                        |           | codec swap
  61   audiobufend----------+-----------+------------
  62
  63   SWCODEC allocates dedicated buffers, MASCODEC reuses audiobuf. */
  64
  65
  66 /***************** Constants *****************/
  67
  68 #define QUEUE_SIZE 64 /* must be a power of two */
  69 #define QUEUE_MASK (QUEUE_SIZE-1)
  70 const char* const dir_thumbnail_name = "_dirname.talk";
  71 const char* const file_thumbnail_ext = ".talk";
  72
  73 /***************** Functional Macros *****************/
  74
  75 #define QUEUE_LEVEL ((queue_write - queue_read) & QUEUE_MASK)
  76
  77 #define LOADED_MASK 0x80000000 /* MSB */
  78
  79 #if CONFIG_CODEC == SWCODEC
  80 #define MAX_THUMBNAIL_BUFSIZE 32768
  81 #endif
  82
  83 #ifndef SIMULATOR
  84 extern bool audio_is_initialized;
  85 #endif
  86
  87 /***************** Data types *****************/
  88
  89 struct clip_entry /* one entry of the index table */
  90 {
  91     int offset; /* offset from start of voicefile file */
  92     int size; /* size of the clip */
  93 };
  94
  95 struct voicefile /* file format of our voice file */
  96 {
  97     int version; /* version of the voicefile */
  98     int target_id; /* the rockbox target the file was made for */
  99     int table;   /* offset to index table, (=header size) */
 100     int id1_max; /* number of "normal" clips contained in above index */
 101     int id2_max; /* number of "voice only" clips contained in above index */
 102     struct clip_entry index[]; /* followed by the index tables */
 103     /* and finally the mp3 clips, not visible here, bitswapped
 104        for SH based players */
 105 };
 106
 107 struct queue_entry /* one entry of the internal queue */
 108 {
 109     unsigned char* buf;
 110     long len;
 111 };
 112
 113
 114 /***************** Globals *****************/
 115
 116 static unsigned char* p_thumbnail = NULL; /* buffer for thumbnail */
 117 static long size_for_thumbnail; /* leftover buffer size for it */
 118 static struct voicefile* p_voicefile; /* loaded voicefile */
 119 static bool has_voicefile; /* a voicefile file is present */
 120 static struct queue_entry queue[QUEUE_SIZE]; /* queue of scheduled clips */
 121 /* enqueue next utterance even if enqueue is false. */
 122 static bool force_enqueue_next;
 123 static int queue_write; /* write index of queue, by application */
 124 static int queue_read; /* read index of queue, by ISR context */
 125 static int sent; /* how many bytes handed over to playback, owned by ISR */
 126 static unsigned char curr_hd[3]; /* current frame header, for re-sync */
 127 static int filehandle = -1; /* global, so the MMC variant can keep the file open */
 128 static unsigned char* p_silence; /* VOICE_PAUSE clip, used for termination */
 129 static long silence_len; /* length of the VOICE_PAUSE clip */
 130 static unsigned char* p_lastclip; /* address of latest clip, for silence add */
 131 static unsigned long voicefile_size = 0; /* size of the loaded voice file */
 132 static unsigned char last_lang[MAX_FILENAME+1]; /* name of last used lang file (in talk_init) */
 133 static bool talk_initialized; /* true if talk_init has been called */
 134 static int talk_menu_disable; /* if non-zero, temporarily disable voice UI (not saved) */
 135
 136 /***************** Private prototypes *****************/
 137
 138 static void load_voicefile(void);
 139 static void mp3_callback(unsigned char** start, size_t* size);
 140 static int queue_clip(unsigned char* buf, long size, bool enqueue);
 141 static int open_voicefile(void);
 142 static unsigned char* get_clip(long id, long* p_size);
 143 static int shutup(void); /* Interrupt voice, as when enqueue is false */
 144
 145 /***************** Private implementation *****************/
 146
 147 static int open_voicefile(void)
 148 {
 149     char buf[64];
 150     char* p_lang = "english"; /* default */
 151
 152     if ( global_settings.lang_file[0] &&
 153          global_settings.lang_file[0] != 0xff )
 154     {   /* try to open the voice file of the selected language */
 155         p_lang = (char *)global_settings.lang_file;
 156     }
 157
 158     snprintf(buf, sizeof(buf), LANG_DIR "/%s.voice", p_lang);
 159
 160     return open(buf, O_RDONLY);
 161 }
 162
 163
 164 /* load the voice file into the mp3 buffer */
 165 static void load_voicefile(void)
 166 {
 167     int load_size;
 168     int got_size;
 169     int file_size;
 170 #ifdef ROCKBOX_LITTLE_ENDIAN
 171     int i;
 172 #endif
 173
 174     filehandle = open_voicefile();
 175     if (filehandle < 0) /* failed to open */
 176         goto load_err;
 177
 178     file_size = filesize(filehandle);
 179     if (file_size > audiobufend - audiobuf) /* won't fit? */
 180        goto load_err;
 181
 182 #ifdef HAVE_MMC /* load only the header for now */
 183     load_size = offsetof(struct voicefile, index);
 184 #else /* load the full file */
 185     load_size = file_size;
 186 #endif
 187
 188     got_size = read(filehandle, audiobuf, load_size);
 189     if (got_size != load_size /* failure */)
 190         goto load_err;
 191
 192 #ifdef ROCKBOX_LITTLE_ENDIAN
 193     logf("Byte swapping voice file");
 194     structec_convert(audiobuf, "lllll", 1, true);
 195 #endif
 196
 197     if (((struct voicefile*)audiobuf)->table /* format check */
 198            == offsetof(struct voicefile, index))
 199     {
 200         p_voicefile = (struct voicefile*)audiobuf;
 201
 202         if (p_voicefile->target_id != TARGET_ID)
 203         {
 204             logf("Incompatible voice file (wrong target)");
 205             goto load_err;
 206         }
 207 #if CONFIG_CODEC != SWCODEC
 208         /* MASCODEC: now use audiobuf for voice then thumbnail */
 209         p_thumbnail = audiobuf + file_size;
 210         p_thumbnail += (long)p_thumbnail % 2; /* 16-bit align */
 211         size_for_thumbnail = audiobufend - p_thumbnail;
 212 #endif
 213     }
 214     else
 215        goto load_err;
 216
 217 #ifdef ROCKBOX_LITTLE_ENDIAN
 218     for (i = 0; i < p_voicefile->id1_max + p_voicefile->id2_max; i++)
 219         structec_convert(&p_voicefile->index[i], "ll", 1, true);
 220 #endif
 221
 222 #ifdef HAVE_MMC
 223     /* load the index table, now that we know its size from the header */
 224     load_size = (p_voicefile->id1_max + p_voicefile->id2_max)
 225                 * sizeof(struct clip_entry);
 226     got_size = read(filehandle,
 227                     (unsigned char *) p_voicefile + offsetof(struct voicefile, index), load_size);
 228     if (got_size != load_size) /* read error */
 229        goto load_err;
 230 #else
 231     close(filehandle); /* only the MMC variant leaves it open */
 232     filehandle = -1;
 233 #endif
 234
 235     /* make sure to have the silence clip, if available */
 236     p_silence = get_clip(VOICE_PAUSE, &silence_len);
 237
 238     return;
 239
 240 load_err:
 241     p_voicefile = NULL;
 242     has_voicefile = false; /* don't try again */
 243     if (filehandle >= 0)
 244     {
 245         close(filehandle);
 246         filehandle = -1;
 247     }
 248     return;
 249 }
 250
 251
 252 /* Are more voice clips queued and waiting? */
 253 bool is_voice_queued()
 254 {
 255     return !!QUEUE_LEVEL;
 256 }
 257
 258
 259 /* called in ISR context if mp3 data got consumed */
 260 static void mp3_callback(unsigned char** start, size_t* size)
 261 {
 262     queue[queue_read].len -= sent; /* we completed this */
 263     queue[queue_read].buf += sent;
 264
 265     if (queue[queue_read].len > 0) /* current clip not finished? */
 266     {   /* feed the next 64K-1 chunk */
 267 #if CONFIG_CODEC != SWCODEC
 268         sent = MIN(queue[queue_read].len, 0xFFFF);
 269 #else
 270         sent = queue[queue_read].len;
 271 #endif
 272         *start = queue[queue_read].buf;
 273         *size = sent;
 274         return;
 275     }
 276     else if (sent > 0) /* go to next entry */
 277     {
 278         queue_read = (queue_read + 1) & QUEUE_MASK;
 279     }
 280
 281 re_check:
 282
 283     if (QUEUE_LEVEL) /* queue is not empty? */
 284     {   /* start next clip */
 285 #if CONFIG_CODEC != SWCODEC
 286         sent = MIN(queue[queue_read].len, 0xFFFF);
 287 #else
 288         sent = queue[queue_read].len;
 289 #endif
 290         *start = p_lastclip = queue[queue_read].buf;
 291         *size = sent;
 292         curr_hd[0] = p_lastclip[1];
 293         curr_hd[1] = p_lastclip[2];
 294         curr_hd[2] = p_lastclip[3];
 295     }
 296     else if (p_silence != NULL             /* silence clip available */
 297              && p_lastclip != p_silence    /* previous clip wasn't silence */
 298              && p_lastclip != p_thumbnail) /* ..or thumbnail */
 299     {   /* add silence clip when queue runs empty playing a voice clip */
 300         queue[queue_write].buf = p_silence;
 301         queue[queue_write].len = silence_len;
 302         queue_write = (queue_write + 1) & QUEUE_MASK;
 303
 304         goto re_check;
 305     }
 306     else
 307     {
 308         *size = 0; /* end of data */
 309     }
 310 }
 311
 312 /* stop the playback and the pending clips */
 313 int do_shutup(void)
 314 {
 315 #if CONFIG_CODEC != SWCODEC
 316     unsigned char* pos;
 317     unsigned char* search;
 318     unsigned char* end;
 319 #endif
 320
 321     if (QUEUE_LEVEL == 0) /* has ended anyway */
 322     {
 323 #if CONFIG_CODEC == SWCODEC
 324         mp3_play_stop();
 325 #endif
 326         return 0;
 327     }
 328 #if CONFIG_CODEC != SWCODEC
 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 #endif
 370
 371     /* nothing to do, was frame boundary or not our clip */
 372     mp3_play_stop();
 373
 374     queue_write = queue_read = 0; /* reset the queue */
 375
 376     return 0;
 377 }
 378
 379 /* Shutup the voice, except if force_enqueue_next is set. */
 380 static int shutup(void)
 381 {
 382     if (!force_enqueue_next)
 383         return do_shutup();
 384     return 0;
 385 }
 386
 387 /* schedule a clip, at the end or discard the existing queue */
 388 static int queue_clip(unsigned char* buf, long size, bool enqueue)
 389 {
 390     int queue_level;
 391
 392     if (!enqueue)
 393         shutup(); /* cut off all the pending stuff */
 394     /* Something is being enqueued, force_enqueue_next override is no
 395        longer in effect. */
 396     force_enqueue_next = false;
 397
 398     if (!size)
 399         return 0; /* safety check */
 400 #if CONFIG_CPU == SH7034
 401     /* disable the DMA temporarily, to be safe of race condition */
 402     CHCR3 &= ~0x0001;
 403 #endif
 404     queue_level = QUEUE_LEVEL; /* check old level */
 405
 406     if (queue_level < QUEUE_SIZE - 1) /* space left? */
 407     {
 408         queue[queue_write].buf = buf; /* populate an entry */
 409         queue[queue_write].len = size;
 410         queue_write = (queue_write + 1) & QUEUE_MASK;
 411     }
 412
 413     if (queue_level == 0)
 414     {   /* queue was empty, we have to do the initial start */
 415         p_lastclip = buf;
 416 #if CONFIG_CODEC != SWCODEC
 417         sent = MIN(size, 0xFFFF); /* DMA can do no more */
 418 #else
 419         sent = size;
 420 #endif
 421         mp3_play_data(buf, sent, mp3_callback);
 422         curr_hd[0] = buf[1];
 423         curr_hd[1] = buf[2];
 424         curr_hd[2] = buf[3];
 425         mp3_play_pause(true); /* kickoff audio */
 426     }
 427     else
 428     {
 429 #if CONFIG_CPU == SH7034
 430         CHCR3 |= 0x0001; /* re-enable DMA */
 431 #endif
 432     }
 433
 434     return 0;
 435 }
 436
 437 /* fetch a clip from the voice file */
 438 static unsigned char* get_clip(long id, long* p_size)
 439 {
 440     long clipsize;
 441     unsigned char* clipbuf;
 442
 443     if (id > VOICEONLY_DELIMITER)
 444     {   /* voice-only entries use the second part of the table */
 445         id -= VOICEONLY_DELIMITER + 1;
 446         if (id >= p_voicefile->id2_max)
 447             return NULL; /* must be newer than we have */
 448         id += p_voicefile->id1_max; /* table 2 is behind table 1 */
 449     }
 450     else
 451     {   /* normal use of the first table */
 452         if (id >= p_voicefile->id1_max)
 453             return NULL; /* must be newer than we have */
 454     }
 455
 456     clipsize = p_voicefile->index[id].size;
 457     if (clipsize == 0) /* clip not included in voicefile */
 458         return NULL;
 459     clipbuf = (unsigned char *) p_voicefile + p_voicefile->index[id].offset;
 460
 461 #ifdef HAVE_MMC /* dynamic loading, on demand */
 462     if (!(clipsize & LOADED_MASK))
 463     {   /* clip used for the first time, needs loading */
 464         lseek(filehandle, p_voicefile->index[id].offset, SEEK_SET);
 465         if (read(filehandle, clipbuf, clipsize) != clipsize)
 466             return NULL; /* read error */
 467
 468         p_voicefile->index[id].size |= LOADED_MASK; /* mark as loaded */
 469     }
 470     else
 471     {   /* clip is in memory already */
 472         clipsize &= ~LOADED_MASK; /* without the extra bit gives true size */
 473     }
 474 #endif
 475
 476     *p_size = clipsize;
 477     return clipbuf;
 478 }
 479
 480
 481 /* common code for talk_init() and talk_buffer_steal() */
 482 static void reset_state(void)
 483 {
 484     queue_write = queue_read = 0; /* reset the queue */
 485     p_voicefile = NULL; /* indicate no voicefile (trashed) */
 486 #if CONFIG_CODEC == SWCODEC
 487     /* Allocate a dedicated thumbnail buffer - once */
 488     if (p_thumbnail == NULL)
 489     {
 490         size_for_thumbnail = audiobufend - audiobuf;
 491         if (size_for_thumbnail > MAX_THUMBNAIL_BUFSIZE)
 492             size_for_thumbnail = MAX_THUMBNAIL_BUFSIZE;
 493         p_thumbnail = buffer_alloc(size_for_thumbnail);
 494     }
 495 #else
 496     /* Just use the audiobuf, without allocating anything */
 497     p_thumbnail = audiobuf;
 498     size_for_thumbnail = audiobufend - audiobuf;
 499 #endif
 500     p_silence = NULL; /* pause clip not accessible */
 501 }
 502
 503 /***************** Public implementation *****************/
 504
 505 void talk_init(void)
 506 {
 507     talk_menu_disable = 0;
 508     if (talk_initialized && !strcasecmp(last_lang, global_settings.lang_file))
 509     {
 510         /* not a new file, nothing to do */
 511         return;
 512     }
 513
 514 #ifdef HAVE_MMC
 515     if (filehandle >= 0) /* MMC: An old voice file might still be open */
 516     {
 517         close(filehandle);
 518         filehandle = -1;
 519     }
 520 #endif
 521
 522     talk_initialized = true;
 523     strncpy((char *) last_lang, (char *)global_settings.lang_file,
 524         MAX_FILENAME);
 525
 526 #if CONFIG_CODEC == SWCODEC
 527     audio_get_buffer(false, NULL);  /* Must tell audio to reinitialize */
 528 #endif
 529     reset_state(); /* use this for most of our inits */
 530
 531     filehandle = open_voicefile();
 532     has_voicefile = (filehandle >= 0); /* test if we can open it */
 533     voicefile_size = 0;
 534
 535     if (has_voicefile)
 536     {
 537         voicefile_size = filesize(filehandle);
 538         close(filehandle); /* close again, this was just to detect presence */
 539         filehandle = -1;
 540     }
 541
 542 }
 543
 544 #if CONFIG_CODEC == SWCODEC
 545 /* return if a voice codec is required or not */
 546 bool talk_voice_required(void)
 547 {
 548     return (voicefile_size != 0) /* Voice file is available */
 549         || (global_settings.talk_dir_clip)  /* Thumbnail clips are required */
 550         || (global_settings.talk_file_clip);
 551 }
 552 #endif
 553
 554 /* return size of voice file */
 555 int talk_get_bufsize(void)
 556 {
 557     return voicefile_size;
 558 }
 559
 560 /* somebody else claims the mp3 buffer, e.g. for regular play/record */
 561 int talk_buffer_steal(void)
 562 {
 563 #if CONFIG_CODEC != SWCODEC
 564     mp3_play_stop();
 565 #endif
 566 #ifdef HAVE_MMC
 567     if (filehandle >= 0) /* only relevant for MMC */
 568     {
 569         close(filehandle);
 570         filehandle = -1;
 571     }
 572 #endif
 573     reset_state();
 574
 575     return 0;
 576 }
 577
 578
 579 /* play a voice ID from voicefile */
 580 int talk_id(long id, bool enqueue)
 581 {
 582     long clipsize;
 583     unsigned char* clipbuf;
 584     int unit;
 585
 586 #if CONFIG_CODEC != SWCODEC
 587     if (audio_status()) /* busy, buffer in use */
 588         return -1;
 589 #endif
 590
 591     if (p_voicefile == NULL && has_voicefile)
 592         load_voicefile(); /* reload needed */
 593
 594     if (p_voicefile == NULL) /* still no voices? */
 595         return -1;
 596
 597     if (id == -1) /* -1 is an indication for silence */
 598         return -1;
 599
 600     /* check if this is a special ID, with a value */
 601     unit = ((unsigned long)id) >> UNIT_SHIFT;
 602     if (unit)
 603     {   /* sign-extend the value */
 604         id = (unsigned long)id << (32-UNIT_SHIFT);
 605         id >>= (32-UNIT_SHIFT);
 606         talk_value(id, unit, enqueue); /* speak it */
 607         return 0; /* and stop, end of special case */
 608     }
 609
 610     clipbuf = get_clip(id, &clipsize);
 611     if (clipbuf == NULL)
 612         return -1; /* not present */
 613
 614     queue_clip(clipbuf, clipsize, enqueue);
 615
 616     return 0;
 617 }
 618
 619 /* Speaks zero or more IDs (from an array). */
 620 int talk_idarray(long *ids, bool enqueue)
 621 {
 622     int r;
 623     if(!ids)
 624         return 0;
 625     while(*ids != TALK_FINAL_ID)
 626     {
 627         if((r = talk_id(*ids++, enqueue)) <0)
 628             return r;
 629         enqueue = true;
 630     }
 631     return 0;
 632 }
 633
 634 /* Make sure the current utterance is not interrupted by the next one. */
 635 void talk_force_enqueue_next(void)
 636 {
 637     force_enqueue_next = true;
 638 }
 639
 640 /* play a thumbnail from file */
 641 int talk_file(const char* filename, bool enqueue)
 642 {
 643     int fd;
 644     int size;
 645     struct mp3entry info;
 646
 647 #if CONFIG_CODEC != SWCODEC
 648     if (audio_status()) /* busy, buffer in use */
 649         return -1;
 650 #endif
 651
 652     if (p_thumbnail == NULL || size_for_thumbnail <= 0)
 653         return -1;
 654
 655     if(mp3info(&info, filename)) /* use this to find real start */
 656     {
 657         return 0; /* failed to open, or invalid */
 658     }
 659
 660     fd = open(filename, O_RDONLY);
 661     if (fd < 0) /* failed to open */
 662     {
 663         return 0;
 664     }
 665
 666     lseek(fd, info.first_frame_offset, SEEK_SET); /* behind ID data */
 667
 668     size = read(fd, p_thumbnail, size_for_thumbnail);
 669     close(fd);
 670
 671     /* ToDo: find audio, skip ID headers and trailers */
 672
 673     if (size != 0 && size != size_for_thumbnail)    /* Don't play missing or truncated clips */
 674     {
 675 #if CONFIG_CODEC != SWCODEC
 676         bitswap(p_thumbnail, size);
 677 #endif
 678         queue_clip(p_thumbnail, size, enqueue);
 679     }
 680
 681     return size;
 682 }
 683
 684
 685 /* say a numeric value, this word ordering works for english,
 686    but not necessarily for other languages (e.g. german) */
 687 int talk_number(long n, bool enqueue)
 688 {
 689     int level = 2; /* mille count */
 690     long mil = 1000000000; /* highest possible "-illion" */
 691
 692 #if CONFIG_CODEC != SWCODEC
 693     if (audio_status()) /* busy, buffer in use */
 694         return -1;
 695 #endif
 696
 697     if (!enqueue)
 698         shutup(); /* cut off all the pending stuff */
 699
 700     if (n==0)
 701     {   /* special case */
 702         talk_id(VOICE_ZERO, true);
 703         return 0;
 704     }
 705
 706     if (n<0)
 707     {
 708         talk_id(VOICE_MINUS, true);
 709         n = -n;
 710     }
 711
 712     while (n)
 713     {
 714         int segment = n / mil; /* extract in groups of 3 digits */
 715         n -= segment * mil; /* remove the used digits from number */
 716         mil /= 1000; /* digit place for next round */
 717
 718         if (segment)
 719         {
 720             int hundreds = segment / 100;
 721             int ones = segment % 100;
 722
 723             if (hundreds)
 724             {
 725                 talk_id(VOICE_ZERO + hundreds, true);
 726                 talk_id(VOICE_HUNDRED, true);
 727             }
 728
 729             /* combination indexing */
 730             if (ones > 20)
 731             {
 732                int tens = ones/10 + 18;
 733                talk_id(VOICE_ZERO + tens, true);
 734                ones %= 10;
 735             }
 736
 737             /* direct indexing */
 738             if (ones)
 739                 talk_id(VOICE_ZERO + ones, true);
 740
 741             /* add billion, million, thousand */
 742             if (mil)
 743                 talk_id(VOICE_THOUSAND + level, true);
 744         }
 745         level--;
 746     }
 747
 748     return 0;
 749 }
 750
 751 /* singular/plural aware saying of a value */
 752 int talk_value(long n, int unit, bool enqueue)
 753 {
 754     int unit_id;
 755     static const int unit_voiced[] =
 756     {   /* lookup table for the voice ID of the units */
 757         [0 ... UNIT_LAST-1] = -1, /* regular ID, int, signed */
 758         [UNIT_MS]
 759             = VOICE_MILLISECONDS, /* here come the "real" units */
 760         [UNIT_SEC]
 761             = VOICE_SECONDS,
 762         [UNIT_MIN]
 763             = VOICE_MINUTES,
 764         [UNIT_HOUR]
 765             = VOICE_HOURS,
 766         [UNIT_KHZ]
 767             = VOICE_KHZ,
 768         [UNIT_DB]
 769             = VOICE_DB,
 770         [UNIT_PERCENT]
 771             = VOICE_PERCENT,
 772         [UNIT_MAH]
 773             = VOICE_MILLIAMPHOURS,
 774         [UNIT_PIXEL]
 775             = VOICE_PIXEL,
 776         [UNIT_PER_SEC]
 777             = VOICE_PER_SEC,
 778         [UNIT_HERTZ]
 779             = VOICE_HERTZ,
 780         [UNIT_MB]
 781             = LANG_MEGABYTE,
 782         [UNIT_KBIT]
 783             = VOICE_KBIT_PER_SEC,
 784         [UNIT_PM_TICK]
 785             = VOICE_PM_UNITS_PER_TICK,
 786     };
 787
 788 #if CONFIG_CODEC != SWCODEC
 789     if (audio_status()) /* busy, buffer in use */
 790         return -1;
 791 #endif
 792
 793     if (unit < 0 || unit >= UNIT_LAST)
 794         unit_id = -1;
 795     else
 796         unit_id = unit_voiced[unit];
 797
 798     if ((n==1 || n==-1) /* singular? */
 799         && unit_id >= VOICE_SECONDS && unit_id <= VOICE_HOURS)
 800     {
 801         unit_id--; /* use the singular for those units which have */
 802     }
 803
 804     /* special case with a "plus" before */
 805     if (n > 0 && (unit == UNIT_SIGNED || unit == UNIT_DB))
 806     {
 807         talk_id(VOICE_PLUS, enqueue);
 808         enqueue = true;
 809     }
 810
 811     talk_number(n, enqueue); /* say the number */
 812     talk_id(unit_id, true); /* say the unit, if any */
 813
 814     return 0;
 815 }
 816
 817 /* spell a string */
 818 int talk_spell(const char* spell, bool enqueue)
 819 {
 820     char c; /* currently processed char */
 821
 822 #if CONFIG_CODEC != SWCODEC
 823     if (audio_status()) /* busy, buffer in use */
 824         return -1;
 825 #endif
 826
 827     if (!enqueue)
 828         shutup(); /* cut off all the pending stuff */
 829
 830     while ((c = *spell++) != '\0')
 831     {
 832         /* if this grows into too many cases, I should use a table */
 833         if (c >= 'A' && c <= 'Z')
 834             talk_id(VOICE_CHAR_A + c - 'A', true);
 835         else if (c >= 'a' && c <= 'z')
 836             talk_id(VOICE_CHAR_A + c - 'a', true);
 837         else if (c >= '0' && c <= '9')
 838             talk_id(VOICE_ZERO + c - '0', true);
 839         else if (c == '-')
 840             talk_id(VOICE_MINUS, true);
 841         else if (c == '+')
 842             talk_id(VOICE_PLUS, true);
 843         else if (c == '.')
 844             talk_id(VOICE_DOT, true);
 845         else if (c == ' ')
 846             talk_id(VOICE_PAUSE, true);
 847     }
 848
 849     return 0;
 850 }
 851
 852 bool talk_menus_enabled(void)
 853 {
 854     return (global_settings.talk_menu && talk_menu_disable == 0);
 855 }
 856
 857
 858 void talk_disable_menus(void)
 859 {
 860     talk_menu_disable++;
 861 }
 862
 863 void talk_enable_menus(void)
 864 {
 865     talk_menu_disable--;
 866 }