apps/codecs/speex.c

   1 /**************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  *
   9  * Copyright (C) 2006 Frederik M.J. Vestre
  10  * Based on vorbis.c codec interface:
  11  * Copyright (C) 2002 Björn Stenberg
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ***************************************************************************/
  22
  23 #include "libspeex/speex/ogg.h"
  24 #include "libspeex/speex/speex.h"
  25 #include "libspeex/speex/speex_callbacks.h"
  26 #include "libspeex/speex/speex_header.h"
  27 #include "libspeex/speex/speex_stereo.h"
  28 #include "libspeex/speex/speex_config_types.h"
  29 #include "codeclib.h"
  30
  31 /* Room for one stereo frame of max size, 2*640 */
  32 #define MAX_FRAME_SIZE 1280
  33 #define CHUNKSIZE 10000  /*2kb*/
  34 #define SEEK_CHUNKSIZE 7*CHUNKSIZE
  35
  36 CODEC_HEADER
  37
  38 spx_int16_t output[MAX_FRAME_SIZE] IBSS_ATTR;
  39
  40 static int get_more_data(spx_ogg_sync_state *oy)
  41 {
  42     int bytes;
  43     char *buffer;
  44
  45     buffer = (char *)spx_ogg_sync_buffer(oy,CHUNKSIZE);
  46
  47     bytes = ci->read_filebuf(buffer, sizeof(char)*CHUNKSIZE);
  48
  49     spx_ogg_sync_wrote(oy,bytes);
  50
  51     return bytes;
  52 }
  53
  54 /* The read/seek functions track absolute position within the stream */
  55
  56 static spx_int64_t get_next_page(spx_ogg_sync_state *oy,spx_ogg_page *og,
  57                                  spx_int64_t boundary)
  58 {
  59     spx_int64_t localoffset = ci->curpos;
  60     long more;
  61     long ret;
  62
  63     if (boundary > 0)
  64         boundary += ci->curpos;
  65
  66     while (1) {
  67         more = spx_ogg_sync_pageseek(oy,og);
  68
  69         if (more < 0) {
  70             /* skipped n bytes */
  71             localoffset-=more;
  72         } else {
  73             if (more == 0) {
  74                 /* send more paramedics */
  75                 if(!boundary)return(-1);
  76                 {
  77                     ret = get_more_data(oy);
  78                     if (ret == 0)
  79                         return(-2);
  80
  81                     if (ret < 0)
  82                         return(-3);
  83                 }
  84             } else {
  85                 /* got a page.  Return the offset at the page beginning,
  86                    advance the internal offset past the page end */
  87
  88                 spx_int64_t ret=localoffset;
  89
  90                 return(ret);
  91             }
  92         }
  93     }
  94 }
  95
  96 static spx_int64_t seek_backwards(spx_ogg_sync_state *oy, spx_ogg_page *og,
  97                                   spx_int64_t wantedpos)
  98 {
  99     spx_int64_t crofs;
 100     spx_int64_t *curoffset=&crofs;
 101     *curoffset=ci->curpos;
 102     spx_int64_t begin=*curoffset;
 103     spx_int64_t end=begin;
 104     spx_int64_t ret;
 105     spx_int64_t offset=-1;
 106     spx_int64_t avgpagelen=-1;
 107     spx_int64_t lastgranule=-1;
 108
 109     short time = -1;
 110
 111     while (offset == -1) {
 112
 113         begin -= SEEK_CHUNKSIZE;
 114
 115         if (begin < 0) {
 116             if (time < 0) {
 117                 begin = 0;
 118                 time++;
 119             } else {
 120                 LOGF("Can't seek that early:%d\n",begin);
 121                 return -3;  /* too early */
 122             }
 123         }
 124
 125         *curoffset = begin;
 126
 127         ci->seek_buffer(*curoffset);
 128
 129         spx_ogg_sync_reset(oy);
 130
 131         lastgranule = -1;
 132
 133         while (*curoffset < end) {
 134             ret = get_next_page(oy,og,end-*curoffset);
 135
 136             if (ret > 0) {
 137                 if (lastgranule != -1) {
 138                     if (avgpagelen < 0)
 139                         avgpagelen = (spx_ogg_page_granulepos(og)-lastgranule);
 140                     else
 141                        avgpagelen=((spx_ogg_page_granulepos(og)-lastgranule)
 142                                    + avgpagelen) / 2;
 143                 }
 144
 145                 lastgranule=spx_ogg_page_granulepos(og);
 146
 147                 if ((lastgranule - (avgpagelen/4)) < wantedpos &&
 148                     (lastgranule + avgpagelen + (avgpagelen/4)) > wantedpos) {
 149
 150                     /*wanted offset found Yeay!*/
 151
 152                     /*LOGF("GnPagefound:%d,%d,%d,%d\n",ret,
 153                            lastgranule,wantedpos,avgpagelen);*/
 154
 155                     return ret;
 156
 157                 } else if (lastgranule > wantedpos) {  /*too late, seek more*/
 158                     if (offset != -1) {
 159                         LOGF("Toolate, returnanyway:%d,%d,%d,%d\n",
 160                              ret,lastgranule,wantedpos,avgpagelen);
 161                         return ret;
 162                     }
 163                     break;
 164                 } else{ /*if (spx_ogg_page_granulepos(&og)<wantedpos)*/
 165                     /*too early*/
 166                     offset = ret;
 167                     continue;
 168                 }
 169             } else if (ret == -3)
 170                 return(-3);
 171             else if (ret<=0)
 172                 break;
 173             else if (*curoffset < end) {
 174                 /*this should not be possible*/
 175
 176                 //LOGF("Seek:get_earlier_page:Offset:not_cached by granule:"\"%d,%d,%d,%d,%d\n",*curoffset,end,begin,wantedpos,curpos);
 177
 178                 offset=ret;
 179             }
 180         }
 181     }
 182     return -1;
 183 }
 184
 185 static int speex_seek_page_granule(spx_int64_t pos, spx_int64_t curpos,
 186                                    spx_ogg_sync_state *oy,
 187                                    spx_int64_t headerssize)
 188 {
 189     /* TODO: Someone may want to try to implement seek to packet,
 190              instead of just to page (should be more accurate, not be any
 191              faster) */
 192
 193     spx_int64_t crofs;
 194     spx_int64_t *curbyteoffset = &crofs;
 195     *curbyteoffset = ci->curpos;
 196     spx_int64_t curoffset;
 197     curoffset = *curbyteoffset;
 198     spx_int64_t offset = 0;
 199     spx_ogg_page og = {0,0,0,0};
 200     spx_int64_t avgpagelen = -1;
 201     spx_int64_t lastgranule = -1;
 202
 203     if(abs(pos-curpos)>10000 && headerssize>0 && curoffset-headerssize>10000) {
 204         /* if seeking for more that 10sec,
 205            headersize is known & more than 10kb is played,
 206            try to guess a place to seek from the number of
 207            bytes playe for this position, this works best when
 208            the bitrate is relativly constant.
 209          */
 210
 211         curoffset = (((*curbyteoffset-headerssize) * pos)/curpos)*98/100;
 212         if (curoffset < 0)
 213             curoffset=0;
 214
 215         //spx_int64_t toffset=curoffset;
 216
 217         ci->seek_buffer(curoffset);
 218
 219         spx_ogg_sync_reset(oy);
 220
 221         offset = get_next_page(oy,&og,-1);
 222
 223         if (offset < 0) { /* could not find new page,use old offset */
 224             LOGF("Seek/guess/fault:%d->-<-%d,%d:%d,%d,%d\n",
 225                  curpos,0,pos,offset,0,
 226                  ci->curpos,/*stream_length*/0);
 227
 228             curoffset = *curbyteoffset;
 229
 230             ci->seek_buffer(curoffset);
 231
 232             spx_ogg_sync_reset(oy);
 233         } else {
 234             if (spx_ogg_page_granulepos(&og) == 0 && pos > 5000) {
 235                 LOGF("SEEK/guess/fault:%d->-<-%d,%d:%d,%d,%d\n",
 236                      curpos,spx_ogg_page_granulepos(&og),pos,
 237                      offset,0,ci->curpos,/*stream_length*/0);
 238
 239                 curoffset = *curbyteoffset;
 240
 241                 ci->seek_buffer(curoffset);
 242
 243                 spx_ogg_sync_reset(oy);
 244             } else {
 245                 curoffset = offset;
 246                 curpos = spx_ogg_page_granulepos(&og);
 247             }
 248         }
 249     }
 250
 251     /* which way do we want to seek? */
 252
 253     if (curpos > pos) {  /* backwards */
 254         offset = seek_backwards(oy,&og,pos);
 255
 256         if (offset > 0) {
 257             *curbyteoffset = curoffset;
 258             return 1;
 259         }
 260     } else {  /* forwards */
 261
 262         while ( (offset = get_next_page(oy,&og,-1)) > 0) {
 263             if (lastgranule != -1) {
 264                if (avgpagelen < 0)
 265                    avgpagelen = (spx_ogg_page_granulepos(&og) - lastgranule);
 266                else
 267                    avgpagelen = ((spx_ogg_page_granulepos(&og) - lastgranule)
 268                                  + avgpagelen) / 2;
 269             }
 270
 271             lastgranule = spx_ogg_page_granulepos(&og);
 272
 273             if ( ((lastgranule - (avgpagelen/4)) < pos && ( lastgranule +
 274                   avgpagelen + (avgpagelen / 4)) > pos) ||
 275                  lastgranule > pos) {
 276
 277                 /*wanted offset found Yeay!*/
 278
 279                 *curbyteoffset = offset;
 280
 281                 return offset;
 282             }
 283         }
 284     }
 285
 286     ci->seek_buffer(*curbyteoffset);
 287
 288     spx_ogg_sync_reset(oy);
 289
 290     LOGF("Seek failed:%d\n", offset);
 291
 292     return -1;
 293 }
 294
 295 static void *process_header(spx_ogg_packet *op,
 296                             int enh_enabled,
 297                             int *frame_size,
 298                             int *rate,
 299                             int *nframes,
 300                             int *channels,
 301                             SpeexStereoState *stereo,
 302                             int *extra_headers
 303                            )
 304 {
 305     void *st;
 306     const SpeexMode *mode;
 307     SpeexHeader *header;
 308     int modeID;
 309     SpeexCallback callback;
 310
 311     header = speex_packet_to_header((char*)op->packet, op->bytes);
 312
 313     if (!header){
 314         DEBUGF ("Cannot read header\n");
 315         return NULL;
 316     }
 317
 318     if (header->mode >= SPEEX_NB_MODES){
 319         DEBUGF ("Mode does not exist\n");
 320         return NULL;
 321     }
 322
 323     modeID = header->mode;
 324
 325     mode = speex_lib_get_mode(modeID);
 326
 327     if (header->speex_version_id > 1) {
 328         DEBUGF("Undecodeable bitstream");
 329         return NULL;
 330     }
 331
 332     if (mode->bitstream_version < header->mode_bitstream_version){
 333         DEBUGF("Undecodeable bitstream, newer bitstream");
 334         return NULL;
 335     }
 336
 337     if (mode->bitstream_version > header->mode_bitstream_version){
 338         DEBUGF("Too old bitstream");
 339         return NULL;
 340     }
 341
 342     st = speex_decoder_init(mode);
 343     if (!st){
 344         DEBUGF("Decoder init failed");
 345         return NULL;
 346     }
 347     speex_decoder_ctl(st, SPEEX_SET_ENH, &enh_enabled);
 348     speex_decoder_ctl(st, SPEEX_GET_FRAME_SIZE, frame_size);
 349
 350     if (header->nb_channels!=1){
 351         callback.callback_id = SPEEX_INBAND_STEREO;
 352         callback.func = speex_std_stereo_request_handler;
 353         callback.data = stereo;
 354         speex_decoder_ctl(st, SPEEX_SET_HANDLER, &callback);
 355     }
 356     *channels = header->nb_channels;
 357
 358     if (!*rate)
 359         *rate = header->rate;
 360
 361     speex_decoder_ctl(st, SPEEX_SET_SAMPLING_RATE, rate);
 362
 363     *nframes = header->frames_per_packet;
 364
 365     *extra_headers = header->extra_headers;
 366
 367     return st;
 368 }
 369
 370 /* this is the codec entry point */
 371 enum codec_status codec_main(void)
 372 {
 373     SpeexBits bits;
 374     int error = 0;
 375     int eof = 0;
 376     spx_ogg_sync_state oy;
 377     spx_ogg_page og;
 378     spx_ogg_packet op;
 379     spx_ogg_stream_state os;
 380     spx_int64_t page_granule = 0, cur_granule = 0;
 381     int enh_enabled = 1;
 382     int nframes = 2;
 383     int eos = 0;
 384     SpeexStereoState *stereo;
 385     int channels = -1;
 386     int rate = 0, samplerate = 0;
 387     int extra_headers = 0;
 388     int stream_init = 0;
 389     int page_nb_packets, frame_size, packet_count = 0;
 390     int lookahead;
 391     int headerssize = -1;
 392     unsigned long strtoffset = 0;
 393     void *st = NULL;
 394     int j = 0;
 395
 396     /* Ogg handling still uses mallocs, so reset the malloc buffer per track */
 397 next_track:
 398
 399     if (codec_init()) {
 400         error = CODEC_ERROR;
 401         goto exit;
 402     }
 403     stereo = speex_stereo_state_init();
 404     strtoffset = ci->id3->offset;
 405
 406     while (!*ci->taginfo_ready && !ci->stop_codec)
 407        ci->sleep(1);
 408
 409     spx_ogg_sync_init(&oy);
 410     spx_ogg_alloc_buffer(&oy,2*CHUNKSIZE);
 411
 412     samplerate = ci->id3->frequency;
 413     codec_set_replaygain(ci->id3);
 414
 415     eof = 0;
 416     while (!eof) {
 417         ci->yield();
 418         if (ci->stop_codec || ci->new_track)
 419             break;
 420
 421         /*seek (seeks to the page before the position) */
 422         if (ci->seek_time) {
 423             if(samplerate!=0&&packet_count>1){
 424                 LOGF("Speex seek page:%d,%d,%d,%d\n",
 425                      ((spx_int64_t)ci->seek_time/1000) *
 426                      (spx_int64_t)samplerate,
 427                      page_granule, ci->seek_time,
 428                      (page_granule/samplerate)*1000, samplerate);
 429
 430                 speex_seek_page_granule(((spx_int64_t)ci->seek_time/1000) *
 431                                         (spx_int64_t)samplerate,
 432                                         page_granule, &oy, headerssize);
 433                 ci->seek_complete();
 434             }
 435         }
 436
 437 next_page:
 438         /*Get the ogg buffer for writing*/
 439         if(get_more_data(&oy)<1){/*read error*/
 440             error=CODEC_ERROR;
 441             goto done;
 442         }
 443
 444         /* Loop for all complete pages we got (most likely only one) */
 445         while (spx_ogg_sync_pageout(&oy, &og) == 1) {
 446             int packet_no;
 447             if (stream_init == 0) {
 448                 spx_ogg_stream_init(&os, spx_ogg_page_serialno(&og));
 449                 stream_init = 1;
 450             }
 451
 452             /* Add page to the bitstream */
 453             spx_ogg_stream_pagein(&os, &og);
 454
 455             page_granule = spx_ogg_page_granulepos(&og);
 456             page_nb_packets = spx_ogg_page_packets(&og);
 457
 458             cur_granule = page_granule;
 459
 460             /* Extract all available packets */
 461             packet_no=0;
 462
 463             while (!eos && spx_ogg_stream_packetout(&os, &op)==1){
 464                 /* If first packet, process as Speex header */
 465                 if (packet_count==0){
 466                     st = process_header(&op, enh_enabled, &frame_size,
 467                                          &samplerate, &nframes, &channels,
 468                                          stereo, &extra_headers);
 469
 470                     speex_decoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead);
 471                     if (!nframes)
 472                         nframes=1;
 473
 474                     if (!st){
 475                         error=CODEC_ERROR;
 476                         goto exit;
 477                     }
 478
 479                     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
 480                     ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
 481                     if (channels == 2) {
 482                         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
 483                     } else if (channels == 1) {
 484                         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
 485                     }
 486
 487                     /* Speex header in its own page, add the whole page
 488                        headersize */
 489                     headerssize += og.header_len+og.body_len;
 490
 491                 } else if (packet_count<=1+extra_headers){
 492                     /* add packet to headersize */
 493                     headerssize += op.bytes;
 494
 495                     /* Ignore extra headers */
 496                 } else {
 497                     if (packet_count <= 2+extra_headers) {
 498                         if (strtoffset) {
 499                             ci->seek_buffer(strtoffset);
 500                             spx_ogg_sync_reset(&oy);
 501                             packet_count++;
 502                             goto next_page;
 503                         }
 504                     }
 505                     packet_no++;
 506
 507                     if (op.e_o_s) /* End of stream condition */
 508                         eos=1;
 509
 510                     /* Set Speex bitstream to point to Ogg packet */
 511                     speex_bits_set_bit_buffer(&bits, (char *)op.packet,
 512                                                      op.bytes);
 513                     for (j = 0; j != nframes; j++){
 514                         int ret;
 515
 516                         /* Decode frame */
 517                         ret = speex_decode_int(st, &bits, output);
 518
 519                         if (ret == -1)
 520                             break;
 521
 522                         if (ret == -2)
 523                             break;
 524
 525                         if (speex_bits_remaining(&bits) < 0)
 526                             break;
 527
 528                         if (channels == 2)
 529                             speex_decode_stereo_int(output, frame_size, stereo);
 530
 531                         if (frame_size > 0) {
 532                             spx_int16_t *frame_start = output + lookahead;
 533
 534                             if (channels == 2)
 535                                 frame_start += lookahead;
 536                             ci->pcmbuf_insert(frame_start, NULL,
 537                                               frame_size - lookahead);
 538                             lookahead = 0;
 539                             /* 2 bytes/sample */
 540                             cur_granule += frame_size / 2;
 541
 542                             ci->set_offset((long) ci->curpos);
 543
 544                             ci->set_elapsed((samplerate == 0) ? 0 :
 545                                              cur_granule * 1000 / samplerate);
 546                          }
 547                     }
 548                 }
 549                 packet_count++;
 550             }
 551         }
 552     }
 553
 554 done:
 555     if (ci->request_next_track()) {
 556
 557         /* Clean things up for the next track */
 558
 559         speex_decoder_destroy(st);
 560
 561         if (stream_init == 1)
 562             spx_ogg_stream_reset(&os);
 563
 564         spx_ogg_sync_reset(&oy);
 565
 566         cur_granule = stream_init = rate = samplerate = headerssize
 567             = packet_count = eos = 0;
 568
 569         goto next_track;
 570     }
 571
 572     error = CODEC_OK;
 573
 574 exit:
 575     speex_bits_destroy(&bits);
 576
 577     if (stream_init)
 578        spx_ogg_stream_destroy(&os);
 579
 580     spx_ogg_sync_destroy(&oy);
 581
 582     return error;
 583 }