summaryrefslogtreecommitdiffstats
path: root/apps/codecs/speex.c
blob: 68010d6e76a283398b42b57b2694227b79b3d1b0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
/**************************************************************************
kate: space-indent on; indent-width 4; mixedindent off; indent-mode cstyle; 
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2006 Frederik M.J. Vestre
 * Based on vorbis.c codec interface:
 * Copyright (C) 2002 Bjrn Stenberg
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/
#include "libspeex/speex/ogg.h"
#include "libspeex/speex/speex.h"
#include "libspeex/speex/speex_header.h"
#include "libspeex/speex/speex_stereo.h"
#include "libspeex/speex/speex_callbacks.h"
#include "codeclib.h"
#define MAX_FRAME_SIZE 2000
#define CHUNKSIZE 10000  /*2kb*/
#define SEEK_CHUNKSIZE 7*CHUNKSIZE
#include <stdio.h>

//#define LOGF(...)

CODEC_HEADER

struct codec_api *rb;

int get_more_data(spx_ogg_sync_state *oy,struct codec_api *rb){
    int bytes;
    char *buffer;
    buffer=(char *)spx_ogg_sync_buffer(oy,CHUNKSIZE);
    bytes=rb->read_filebuf(buffer, sizeof(char)*CHUNKSIZE);
    spx_ogg_sync_wrote(oy,bytes);
    return bytes;
}
/* The read/seek functions track absolute position within the stream */

static spx_int64_t get_next_page(spx_ogg_sync_state *oy,spx_ogg_page *og,
	spx_int64_t boundary,struct codec_api *rb){
    spx_int64_t localoffset=rb->curpos;
    if(boundary>0)boundary+=rb->curpos;
    while(1){
        long more;
        more=spx_ogg_sync_pageseek(oy,og);
        if(more<0){
            /* skipped n bytes */
            localoffset-=more;
        }else{
            if(more==0){
                /* send more paramedics */
                if(!boundary)return(-1);
                {
                    long ret=1;
                    ret=get_more_data(oy,rb);
                    if(ret==0) 
                        return(-2);
                    if(ret<0)
                        return(-3);
                }
            }else{
                /* got a page.  Return the offset at the page beginning,
                advance the internal offset past the page end */
                spx_int64_t ret=localoffset;
                return(ret);
            }
        }
    }
}

static spx_int64_t seek_backwards(
       spx_ogg_sync_state *oy,spx_ogg_page *og,
       spx_int64_t wantedpos,
       struct codec_api *rb
){
    spx_int64_t crofs;
    spx_int64_t *curoffset=&crofs;
    *curoffset=rb->curpos;
    spx_int64_t begin=*curoffset;
    spx_int64_t end=begin;
    spx_int64_t ret;
    spx_int64_t offset=-1;
    spx_int64_t avgpagelen=-1;
    spx_int64_t lastgranule=-1;
    short time=-1;
    while(offset==-1){
        begin-=SEEK_CHUNKSIZE;
        if(begin<0){
            if(time<0){
                begin=0;
                time++;
            }else{
                LOGF("Can't seek that early:%d\n",begin);
                return -3;/*too early*/
            }
        }
        *curoffset=begin;
        rb->seek_buffer(*curoffset);
        spx_ogg_sync_reset(oy);
        lastgranule=-1;
        while(*curoffset<end){
            ret=get_next_page(oy,og,end-*curoffset,rb);
            if(ret>0){
                if(lastgranule!=-1){
                    if(avgpagelen<0)
                        avgpagelen=(spx_ogg_page_granulepos(og)-lastgranule);
                    else
                       avgpagelen=((spx_ogg_page_granulepos(og)-lastgranule)
                                +avgpagelen)/2;
                }
                lastgranule=spx_ogg_page_granulepos(og);
               if((lastgranule-(avgpagelen/4))<wantedpos&&
                   (lastgranule+avgpagelen+(avgpagelen/4))>wantedpos){
                    /*wanted offset found Yeay!*/
                   /*LOGF("GnPagefound:%d,%d,%d,%d\n",ret,
                   lastgranule,wantedpos,avgpagelen);*/
                    return ret;
                }else if (lastgranule>wantedpos){/*too late, seek more*/
                    if(offset!=-1){
                        LOGF("Toolate, returnanyway:%d,%d,%d,%d\n",
                             ret,lastgranule,wantedpos,avgpagelen);
                        return ret;
                    }
                    break;
                } else{ /*if (spx_ogg_page_granulepos(&og)<wantedpos)*/
                    /*too early*/
                    offset=ret;
                    continue;
                }
            } else if(ret==-3) return(-3);
            else if(ret<=0)
                break;
            else if(*curoffset<end) {
                /*this should not be possible*/
                //LOGF("Seek:get_earlier_page:Offset:not_cached by granule:"\"%d,%d,%d,%d,%d\n",*curoffset,end,begin,wantedpos,curpos);
                offset=ret;
            }
        }
    }
    return -1;
}

int speex_seek_page_granule(
    spx_int64_t pos,
    spx_int64_t curpos,
    spx_ogg_sync_state *oy,
    spx_int64_t headerssize,
    struct codec_api *rb
){
    /* TODO: Someone may want to try to implement seek to packet, 
    * instead of just to page (should be more accurate, not be any faster)*/
    spx_int64_t crofs;
    spx_int64_t *curbyteoffset=&crofs;
    *curbyteoffset=rb->curpos;
    spx_int64_t curoffset;
    curoffset=*curbyteoffset;
    spx_int64_t offset=0;
    spx_ogg_page og={0,0,0,0};
    spx_int64_t avgpagelen=-1;
    spx_int64_t lastgranule=-1;
    if(abs(pos-curpos)>10000 && headerssize>0 && curoffset-headerssize>10000){
        /*if seeking for more that 10sec,
        headersize is known & more than 10kb is played,
        try to guess a place to seek from the number of
        bytes playe for this position, this works best when 
        the bitrate is relativly constant.*/
       curoffset=(int)((((float)(*curbyteoffset-(headerssize))
               *(float)pos)/(float)curpos)*0.98);
        if(curoffset<0)
            curoffset=0;
        //spx_int64_t toffset=curoffset;
        rb->seek_buffer(curoffset);
        spx_ogg_sync_reset(oy);
        offset=get_next_page(oy,&og,-1,rb);
        if(offset<0){/*could not find new page,use old offset*/
           LOGF("Seek/guess/fault:%d->-<-%d,%d:%d,%d,%d\n",
                curpos,0,pos,offset,0,
                rb->curpos,/*stream_length*/0);
            curoffset=*curbyteoffset;
            rb->seek_buffer(curoffset);
            spx_ogg_sync_reset(oy);
        }else{
            if(spx_ogg_page_granulepos(&og)==0&&pos>5000){
               LOGF("SEEK/guess/fault:%d->-<-%d,%d:%d,%d,%d\n",
                    curpos,spx_ogg_page_granulepos(&og),pos,
                    offset,0,rb->curpos,/*stream_length*/0);
                curoffset=*curbyteoffset;
                rb->seek_buffer(curoffset);
                spx_ogg_sync_reset(oy);
            }else{
                curoffset=offset;
                curpos=spx_ogg_page_granulepos(&og);
            }
        }
    }
    /*which way do we want to seek?*/
    if(curpos>pos){/*backwards*/
        offset=seek_backwards(oy,&og,pos,rb);
        if(offset>0){
            *curbyteoffset=curoffset;
            return 1;
        }
    }else{/*forwards*/
        while((offset=get_next_page(oy,&og,-1,rb))>0){
            if(lastgranule!=-1){
               if(avgpagelen<0)
                   avgpagelen=(spx_ogg_page_granulepos(&og)-lastgranule);
                else
                    avgpagelen=((spx_ogg_page_granulepos(&og)-lastgranule)
                            +avgpagelen)/2;
            }
            lastgranule=spx_ogg_page_granulepos(&og);
            if(((lastgranule-(avgpagelen/4))<pos
                 &&(lastgranule+avgpagelen+(avgpagelen/4))>pos)||
                 lastgranule>pos
            ){
                /*wanted offset found Yeay!*/
                *curbyteoffset=offset;
                return offset;
            }
        }
    }
    rb->seek_buffer(*curbyteoffset);
    spx_ogg_sync_reset(oy);
    LOGF("Seek failed:%d\n",offset);
    rb->splash(HZ*2, true, "Seek failed");
    return -1;
}




static void *process_header(
    spx_ogg_packet *op,
    int enh_enabled,
    int *frame_size,
    int *rate,
    int *nframes,
    int *channels,
    SpeexStereoState *stereo,
    int *extra_headers
){
    void *st;
    const SpeexMode *mode;
    SpeexHeader *header;
    int modeID;
    SpeexCallback callback;
    header = speex_packet_to_header((char*)op->packet, op->bytes);
    if (!header){
        DEBUGF ("Cannot read header\n");
        return NULL;
    }
    if (header->mode >= SPEEX_NB_MODES){
        DEBUGF ("Mode does not exist\n");
        return NULL;
    }

   modeID = header->mode;

   mode = speex_lib_get_mode (modeID);
   if (header->speex_version_id > 1){
       DEBUGF("Undecodeable bitstream");
       return NULL;
   }
   if (mode->bitstream_version < header->mode_bitstream_version){
       DEBUGF("Undecodeable bitstream, newer bitstream");
      return NULL;
   }
   if (mode->bitstream_version > header->mode_bitstream_version){
       DEBUGF("Too old bitstream");
       return NULL;
   }
   
   st = speex_decoder_init(mode);
   if (!st){
      DEBUGF("Decoder init failed");
      return NULL;
   }
   speex_decoder_ctl(st, SPEEX_SET_ENH, &enh_enabled);
   speex_decoder_ctl(st, SPEEX_GET_FRAME_SIZE, frame_size);

   if (*channels==-1)
      *channels = header->nb_channels;

   if (!(*channels==1)){
      callback.callback_id = SPEEX_INBAND_STEREO;
      callback.func = speex_std_stereo_request_handler;
      callback.data = stereo;
      speex_decoder_ctl(st, SPEEX_SET_HANDLER, &callback);
   }
   if (!*rate)
      *rate = header->rate;

   speex_decoder_ctl(st, SPEEX_SET_SAMPLING_RATE, rate);

   *nframes = header->frames_per_packet;

   if (*channels == 2) {
      rb->configure(DSP_SET_STEREO_MODE, (int *)STEREO_INTERLEAVED);
   } else if (*channels == 1) {
      rb->configure(DSP_SET_STEREO_MODE, (int *)STEREO_MONO);
   }

   *extra_headers = header->extra_headers;

   codec_free(header);
   return st;
}


#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
extern char iedata[];
extern char iend[];
#endif

/* this is the codec entry point */
enum codec_status codec_main()
{
    SpeexBits vf;
    int error;
    int eof;
    spx_ogg_sync_state oy;
    spx_ogg_page og;
    spx_ogg_packet op;
    spx_ogg_stream_state os;
    spx_int64_t page_granule=0, cur_granule=0;
    int enh_enabled;
    int nframes=2;
    int eos=0;
    SpeexStereoState stereo = SPEEX_STEREO_STATE_INIT;
    int channels=-1;
    int rate=0,samplerate=0;
    int extra_headers;
    int stream_init=0;
    int page_nb_packets,frame_size,packet_count=0;
    int lookahead;
    int headerssize=-1;
    unsigned long strtoffset;
    short output[MAX_FRAME_SIZE];
    enh_enabled = 1;
    void *st=0;
    rb = ci;

#if 0 /*USE_IRAM */
    rb->memcpy(iramstart, iramcopy, iramend - iramstart);
    rb->memset(iedata, 0, iend - iedata);
#endif
    //rb->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (long *)(CHUNKSIZE*128));
//    rb->configure(DSP_DITHER, (bool *)false);
    rb->configure(DSP_SET_SAMPLE_DEPTH, (long *)16);
    /* We need to flush reserver memory every track load. */
next_track:
    if (codec_init()) {
        error = CODEC_ERROR;
        goto exit;
    }
    strtoffset=rb->id3->offset;
    while (!*rb->taginfo_ready && !rb->stop_codec)
       rb->sleep(1);


    spx_ogg_sync_init(&oy);
    spx_ogg_alloc_buffer(&oy,2*CHUNKSIZE);
    samplerate=rb->id3->frequency; 
    codec_set_replaygain(rb->id3);
    speex_bits_init(&vf);

    eof = 0;
    while (!eof) {
        rb->yield();
        if (rb->stop_codec || rb->new_track)
            break;

        if (rb->seek_time) {/*seek (seeks to the page before the position*/
            if(samplerate!=0&&packet_count>1){
                LOGF("Speex seek page:%d,%d,%d,%d\n",
                     ((spx_int64_t)rb->seek_time/1000)
                             *(spx_int64_t)samplerate,
                     page_granule,
                     rb->seek_time,
                     (page_granule/samplerate)*1000,
                     samplerate
                );
                speex_seek_page_granule(
                        ((spx_int64_t)rb->seek_time/1000)
                                *(spx_int64_t)samplerate,
                        page_granule,&oy,
                        headerssize,
                        rb
                );
                rb->seek_complete();
            }
        }
        int j;
next_page:
        /*Get the ogg buffer for writing*/
        if(get_more_data(&oy,rb)<1){/*read error*/
            error=CODEC_ERROR;
            goto done;
        }
        /*Loop for all complete pages we got (most likely only one)*/
        while (spx_ogg_sync_pageout(&oy, &og)==1){
            int packet_no;
            if (stream_init == 0) {
                spx_ogg_stream_init(&os,spx_ogg_page_serialno(&og));
                stream_init = 1;
            }
            /*Add page to the bitstream*/
            spx_ogg_stream_pagein(&os, &og);

            page_granule = spx_ogg_page_granulepos(&og);
            page_nb_packets = spx_ogg_page_packets(&og);

            cur_granule = page_granule;

            /*Extract all available packets*/
            packet_no=0;

            while (!eos && spx_ogg_stream_packetout(&os, &op)==1){
                /*If first packet, process as Speex header*/
                if (packet_count==0){
                    st = process_header(&op, enh_enabled, &frame_size,
                                         &samplerate,&nframes, &channels,
                                         &stereo, &extra_headers);
                    speex_decoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead);
                    if (!nframes)
                        nframes=1;
                    if (!st){
                        error=CODEC_ERROR;
                        goto exit;
                    }
                    rb->id3->vbr = true;
                    rb->id3->frequency = samplerate;
                    rb->configure(DSP_SET_FREQUENCY, (int *)samplerate);
                    headerssize+=og.header_len+og.body_len;/*Speex header in 
                        it's own page, add the whole page  headersize*/
                } else if (packet_count<=1+extra_headers){
                    headerssize+=op.bytes;/*add packet to headersize*/
                    /* Ignore extra headers */
                } else {
                    if(packet_count<=2+extra_headers){
                        if (strtoffset) {
                            rb->seek_buffer(strtoffset);
                            spx_ogg_sync_reset(&oy);
                            packet_count++;
                            goto next_page;
                        }
                    }
                    packet_no++;
                    if (op.e_o_s) /*End of stream condition*/
                        eos=1;
                    /*Copy Ogg packet to Speex bitstream*/
                    speex_bits_read_from(&vf, (char*)op.packet, op.bytes);
                    for (j=0;j!=nframes;j++){
                        int ret;
                        /*Decode frame*/
                        ret = speex_decode_int(st, &vf, output);
                        if (ret==-1)
                            break;
                        if (ret==-2)
                            break;
                        if (speex_bits_remaining(&vf)<0)
                            break;
                        if (channels==2)
                            speex_decode_stereo_int(output, frame_size,&stereo);
                        {
                            int new_frame_size = frame_size;
                            if (new_frame_size>0){  
                                rb->pcmbuf_insert(
                                        (const char*)output,
                                        (const char*)output,
                                        new_frame_size*channels
                                );
                                cur_granule+=new_frame_size/2;/*2 bytes/sample*/
                                rb->set_offset((long)rb->curpos);
                                rb->set_elapsed((samplerate==0)?0:
                                        cur_granule*1000/samplerate
                                );
                            }
                        }
                    }
                }
                packet_count++;
            }
        }
    }
done:
    if (rb->request_next_track()) {
        /* Clean things up for the next track */
        speex_decoder_destroy(st);
        speex_bits_reset(&vf);
        if (stream_init==1)
            spx_ogg_stream_reset(&os);
        spx_ogg_sync_reset(&oy);
        cur_granule=stream_init=rate=samplerate=headerssize=packet_count=eos=0;
        stereo.balance=stereo.smooth_left=stereo.smooth_right= 1;
        stereo.e_ratio = .5;
        stereo.reserved1=stereo.reserved2= 0;
        goto next_track;
    }
    error = CODEC_OK;
exit:
    speex_bits_destroy(&vf);
    if (stream_init)
       spx_ogg_stream_destroy(&os);
    spx_ogg_sync_destroy(&oy);
    return error;
}