aboutsummaryrefslogtreecommitdiffstats
path: root/libtoolame-dab/toolame.c
blob: 7dc5aa53f905b624c10d433157172296469f2be4 (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
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "encoder.h"
#include "options.h"
#include "bitstream.h"
#include "mem.h"
#include "crc.h"
#include "psycho_n1.h"
#include "psycho_0.h"
#include "psycho_1.h"
#include "psycho_2.h"
#include "psycho_3.h"
#include "psycho_4.h"
#include "encode.h"
#include "availbits.h"
#include "subband.h"
#include "encode_new.h"
#include "toolame.h"
#include "utils.h"
#include <assert.h>

Bit_stream_struc bs;

const int FPAD_LENGTH=2;

void smr_dump(double smr[2][SBLIMIT], int nch);

void global_init (void)
{
    glopts.usepsy = TRUE;
    glopts.usepadbit = TRUE;
    glopts.quickmode = FALSE;
    glopts.quickcount = 10;
    glopts.downmix = FALSE;
    glopts.byteswap = FALSE;
    glopts.vbr = FALSE;
    glopts.vbrlevel = 0;
    glopts.athlevel = 0;
    glopts.verbosity = 2;
}

/************************************************************************
 *
 * main
 *
 * PURPOSE:  MPEG II Encoder with
 * psychoacoustic models 1 (MUSICAM) and 2 (AT&T)
 *
 * SEMANTICS:  One overlapping frame of audio of up to 2 channels are
 * processed at a time in the following order:
 * (associated routines are in parentheses)
 *
 * 1.  Filter sliding window of data to get 32 subband
 * samples per channel.
 * (window_subband,filter_subband)
 *
 * 2.  If joint stereo mode, combine left and right channels
 * for subbands above #jsbound#.
 * (combine_LR)
 *
 * 3.  Calculate scalefactors for the frame, and 
 * also calculate scalefactor select information.
 * (*_scale_factor_calc)
 *
 * 4.  Calculate psychoacoustic masking levels using selected
 * psychoacoustic model.
 * (psycho_i, psycho_ii)
 *
 * 5.  Perform iterative bit allocation for subbands with low
 * mask_to_noise ratios using masking levels from step 4.
 * (*_main_bit_allocation)
 *
 * 6.  If error protection flag is active, add redundancy for
 * error protection.
 * (*_CRC_calc)
 *
 * 7.  Pack bit allocation, scalefactors, and scalefactor select
 *headerrmation onto bitstream.
 * (*_encode_bit_alloc,*_encode_scale,transmission_pattern)
 *
 * 8.  Quantize subbands and pack them into bitstream
 * (*_subband_quantization, *_sample_encoding)
 *
 ************************************************************************/

static frame_info frame;
static frame_header header;
static int frameNum;
static int psycount;
static int model;
static unsigned int crc;

typedef double SBS[2][3][SCALE_BLOCK][SBLIMIT];
typedef double JSBS[3][SCALE_BLOCK][SBLIMIT];
typedef unsigned int SUB[2][3][SCALE_BLOCK][SBLIMIT];

static SBS *sb_sample;
static JSBS *j_sample;
static SUB *subband;

static unsigned int scalar[2][3][SBLIMIT];
static unsigned int j_scale[3][SBLIMIT];

static double smr[2][SBLIMIT];
static double max_sc[2][SBLIMIT];
static short sam[2][1344];

/* Used to keep the SNR values for the fast/quick psy models */
static FLOAT smrdef[2][32];

static unsigned int scfsi[2][SBLIMIT];
static unsigned int bit_alloc[2][SBLIMIT];

static char* mot_file = NULL;
static char* icy_file = NULL;

int toolame_init(void)
{
    frameNum = 0;
    psycount = 0;

    frame.header = &header;
    frame.tab_num = -1;		/* no table loaded */
    frame.alloc = NULL;

    sb_sample = (SBS *) mem_alloc (sizeof (SBS), "sb_sample");
    j_sample = (JSBS *) mem_alloc (sizeof (JSBS), "j_sample");
    subband = (SUB *) mem_alloc (sizeof (SUB), "subband");
    memset ((char *) scalar, 0, sizeof (scalar));
    memset ((char *) j_scale, 0, sizeof (j_scale));
    memset ((char *) smr, 0, sizeof (smr));
    memset ((char *) max_sc, 0, sizeof (max_sc));
    memset ((char *) sam, 0, sizeof (sam));
    memset ((char *) scfsi, 0, sizeof (scfsi));
    memset ((char *) bit_alloc, 0, sizeof (bit_alloc));

    global_init();

    header.extension = 0;
    header.version = MPEG_AUDIO_ID;	/* Default: MPEG-1 */
    header.copyright = 0;
    header.original = 0;
    header.error_protection = TRUE;
    header.dab_extension = 4;
    header.lay = DFLT_LAY;

    model = DFLT_PSY;

    return 0;
}

int toolame_finish(
        unsigned char *output_buffer,
        size_t output_buffer_size)
{
    bs.output_buffer = output_buffer;
    bs.output_buffer_size = output_buffer_size;
    bs.output_buffer_written = 0;

    close_bit_stream_w(&bs);

    return bs.output_buffer_written;
}

int toolame_enable_downmix_stereo(void)
{
    glopts.downmix = TRUE;
    header.mode = MPG_MD_MONO;
    header.mode_ext = 0;
    return 0;
}

int toolame_enable_byteswap(void)
{
    glopts.byteswap = TRUE;
    return 0;
}

int toolame_set_channel_mode(const char mode)
{
    switch (mode) {
        case 's':
            header.mode = MPG_MD_STEREO;
            header.mode_ext = 0;
            break;
        case 'd':
            header.mode = MPG_MD_DUAL_CHANNEL;
            header.mode_ext = 0;
            break;
            /* in j-stereo mode, no default header.mode_ext was defined, gave error..
               now  default = 2   added by MFC 14 Dec 1999.  */
        case 'j':
            header.mode = MPG_MD_JOINT_STEREO;
            header.mode_ext = 2;
            break;
        case 'm':
            header.mode = MPG_MD_MONO;
            header.mode_ext = 0;
            break;
        default:
            fprintf (stderr, "libtoolame-dab: Bad mode %c\n", mode);
            return 1;
    }
    return 0;
}

int toolame_set_psy_model(int new_model)
{
    if (new_model < 0 || new_model > 3) {
        fprintf(stderr, "libtoolame-dab: Invalid PSY model %d\n", new_model);
        return 1;
    }
    model = new_model;
    return 0;
}

int toolame_set_bitrate(int brate)
{
    int err = 0;

    /* check for a valid bitrate */
    if (brate == 0)
        brate = bitrate[header.version][10];

    /* Check to see we have a sane value for the bitrate for this version */
    if ((header.bitrate_index = BitrateIndex (brate, header.version)) < 0) {
        err = 1;
    }

    if (header.dab_extension) {
        /* in 48 kHz (= MPEG-1) */
        /* if the bit rate per channel is less then 56 kbit/s, we have 2 scf-crc */
        /* else we have 4 scf-crc */
        /* in 24 kHz (= MPEG-2), we have 4 scf-crc */
        if (header.version == MPEG_AUDIO_ID && (brate / (header.mode == MPG_MD_MONO ? 1 : 2) < 56))
            header.dab_extension = 2;
    }

    open_bit_stream_w(&bs, BUFFER_SIZE);

    return err;
}

int toolame_set_samplerate(long sample_rate)
{
    int s_freq = SmpFrqIndex(sample_rate, &header.version);
    if (s_freq < 0) {
        return s_freq;
    }

    header.sampling_frequency = s_freq;
    return 0;
}

int toolame_set_pad(int pad_len)
{
    if (pad_len < 0) {
        fprintf(stderr, "Invalid XPAD length specified\n");
        return 1;
    }

    if (pad_len) {
        header.dab_length = pad_len;
    }

    return 0;
}


static int encode_first_call = 1;

int toolame_encode_frame(
        short buffer[2][1152],
        unsigned char *xpad_data,
        size_t xpad_len,
        unsigned char *output_buffer,
        size_t output_buffer_size)
{
    extern int minimum;
    if (encode_first_call) {
        hdr_to_frps(&frame);
        encode_first_call = 0;
    }

    const int nch = frame.nch;
    const int error_protection = header.error_protection;

    bs.output_buffer = output_buffer;
    bs.output_buffer_size = output_buffer_size;
    bs.output_buffer_written = 0;

#ifdef REFERENCECODE
    short *win_buf[2] = {&buffer[0][0], &buffer[1][0]};
#endif

    int adb = available_bits (&header, &glopts);
    int lg_frame = adb / 8;
    if (header.dab_extension) {
        /* You must have one frame in memory if you are in DAB mode                 */
        /* in conformity of the norme ETS 300 401 http://www.etsi.org               */
        /* see bitstream.c            */
        if (frameNum == 1)
            minimum = lg_frame + MINIMUM;
        adb -= header.dab_extension * 8 + (xpad_len ? xpad_len : FPAD_LENGTH) * 8;
    }

    {
        int gr, bl, ch;
        /* New polyphase filter
           Combines windowing and filtering. Ricardo Feb'03 */
        for( gr = 0; gr < 3; gr++ )
            for ( bl = 0; bl < 12; bl++ )
                for ( ch = 0; ch < nch; ch++ )
                    WindowFilterSubband( &buffer[ch][gr * 12 * 32 + 32 * bl], ch,
                            &(*sb_sample)[ch][gr][bl][0] );
    }

#ifdef REFERENCECODE
    {
        /* Old code. left here for reference */
        int gr, bl, ch;
        for (gr = 0; gr < 3; gr++)
            for (bl = 0; bl < SCALE_BLOCK; bl++)
                for (ch = 0; ch < nch; ch++) {
                    window_subband (&win_buf[ch], &(*win_que)[ch][0], ch);
                    filter_subband (&(*win_que)[ch][0], &(*sb_sample)[ch][gr][bl][0]);
                }
    }
#endif


#ifdef NEWENCODE
    scalefactor_calc_new(*sb_sample, scalar, nch, frame.sblimit);
    find_sf_max (scalar, &frame, max_sc);
    if (frame.actual_mode == MPG_MD_JOINT_STEREO) {
        /* this way we calculate more mono than we need */
        /* but it is cheap */
        combine_LR_new (*sb_sample, *j_sample, frame.sblimit);
        scalefactor_calc_new (j_sample, &j_scale, 1, frame.sblimit);
    }
#else
    scale_factor_calc (*sb_sample, scalar, nch, frame.sblimit);
    pick_scale (scalar, &frame, max_sc);
    if (frame.actual_mode == MPG_MD_JOINT_STEREO) {
        /* this way we calculate more mono than we need */
        /* but it is cheap */
        combine_LR (*sb_sample, *j_sample, frame.sblimit);
        scale_factor_calc (j_sample, &j_scale, 1, frame.sblimit);
    }
#endif



    if ((glopts.quickmode == TRUE) && (++psycount % glopts.quickcount != 0)) {
        /* We're using quick mode, so we're only calculating the model every
           'quickcount' frames. Otherwise, just copy the old ones across */
        for (int ch = 0; ch < nch; ch++) {
            for (int sb = 0; sb < SBLIMIT; sb++)
                smr[ch][sb] = smrdef[ch][sb];
        }
    }
    else {
        /* calculate the psymodel */
        switch (model) {
            case -1:
                psycho_n1 (smr, nch);
                break;
            case 0:	/* Psy Model A */
                psycho_0 (smr, nch, scalar, (FLOAT) s_freq[header.version][header.sampling_frequency] * 1000);
                break;
            case 1:
                psycho_1 (buffer, max_sc, smr, &frame);
                break;
            case 2:
                for (int ch = 0; ch < nch; ch++) {
                    psycho_2 (&buffer[ch][0], &sam[ch][0], ch, &smr[ch][0], //snr32,
                            (FLOAT) s_freq[header.version][header.sampling_frequency] *
                            1000, &glopts);
                }
                break;
            case 3:
                /* Modified psy model 1 */
                psycho_3 (buffer, max_sc, smr, &frame, &glopts);
                break;
            case 4:
                /* Modified Psycho Model 2 */
                for (int ch = 0; ch < nch; ch++) {
                    psycho_4 (&buffer[ch][0], &sam[ch][0], ch, &smr[ch][0], // snr32,
                            (FLOAT) s_freq[header.version][header.sampling_frequency] *
                            1000, &glopts);
                }
                break;	
            case 5:
                /* Model 5 comparse model 1 and 3 */
                psycho_1 (buffer, max_sc, smr, &frame);
                fprintf(stdout,"1 ");
                smr_dump(smr,nch);
                psycho_3 (buffer, max_sc, smr, &frame, &glopts);
                fprintf(stdout,"3 ");
                smr_dump(smr,nch);
                break;
            case 6:
                /* Model 6 compares model 2 and 4 */
                for (int ch = 0; ch < nch; ch++) 
                    psycho_2 (&buffer[ch][0], &sam[ch][0], ch, &smr[ch][0], //snr32,
                            (FLOAT) s_freq[header.version][header.sampling_frequency] *
                            1000, &glopts);
                fprintf(stdout,"2 ");
                smr_dump(smr,nch);
                for (int ch = 0; ch < nch; ch++) 
                    psycho_4 (&buffer[ch][0], &sam[ch][0], ch, &smr[ch][0], // snr32,
                            (FLOAT) s_freq[header.version][header.sampling_frequency] *
                            1000, &glopts);
                fprintf(stdout,"4 ");
                smr_dump(smr,nch);
                break;
            case 7:
                fprintf(stdout,"Frame: %i\n",frameNum);
                /* Dump the SMRs for all models */	
                psycho_1 (buffer, max_sc, smr, &frame);
                fprintf(stdout,"1");
                smr_dump(smr, nch);
                psycho_3 (buffer, max_sc, smr, &frame, &glopts);
                fprintf(stdout,"3");
                smr_dump(smr,nch);
                for (int ch = 0; ch < nch; ch++) 
                    psycho_2 (&buffer[ch][0], &sam[ch][0], ch, &smr[ch][0], //snr32,
                            (FLOAT) s_freq[header.version][header.sampling_frequency] *
                            1000, &glopts);
                fprintf(stdout,"2");
                smr_dump(smr,nch);
                for (int ch = 0; ch < nch; ch++) 
                    psycho_4 (&buffer[ch][0], &sam[ch][0], ch, &smr[ch][0], // snr32,
                            (FLOAT) s_freq[header.version][header.sampling_frequency] *
                            1000, &glopts);
                fprintf(stdout,"4");
                smr_dump(smr,nch);
                break;
            case 8:
                /* Compare 0 and 4 */	
                psycho_n1 (smr, nch);
                fprintf(stdout,"0");
                smr_dump(smr,nch);

                for (int ch = 0; ch < nch; ch++) 
                    psycho_4 (&buffer[ch][0], &sam[ch][0], ch, &smr[ch][0], // snr32,
                            (FLOAT) s_freq[header.version][header.sampling_frequency] *
                            1000, &glopts);
                fprintf(stdout,"4");
                smr_dump(smr,nch);
                break;
            default:
                fprintf (stderr, "Invalid psy model specification: %i\n", model);
                exit (0);
        }

        if (glopts.quickmode == TRUE) {
            /* copy the smr values and reuse them later */
            for (int ch = 0; ch < nch; ch++) {
                for (int sb = 0; sb < SBLIMIT; sb++)
                    smrdef[ch][sb] = smr[ch][sb];
            }
        }

        if (glopts.verbosity > 4) {
            smr_dump(smr, nch);
        }
    }

#ifdef NEWENCODE
    sf_transmission_pattern (scalar, scfsi, &frame);
    main_bit_allocation_new (smr, scfsi, bit_alloc, &adb, &frame, &glopts);
    //main_bit_allocation (smr, scfsi, bit_alloc, &adb, &frame, &glopts);

    if (error_protection) {
        CRC_calc (&frame, bit_alloc, scfsi, &crc);
    }

    write_header (&frame, &bs);
    //encode_info (&frame, &bs);
    if (error_protection) {
        putbits (&bs, crc, 16);
    }
    write_bit_alloc (bit_alloc, &frame, &bs);
    //encode_bit_alloc (bit_alloc, &frame, &bs);
    write_scalefactors(bit_alloc, scfsi, scalar, &frame, &bs);
    //encode_scale (bit_alloc, scfsi, scalar, &frame, &bs);
    subband_quantization_new (scalar, *sb_sample, j_scale, *j_sample, bit_alloc,
            *subband, &frame);
    //subband_quantization (scalar, *sb_sample, j_scale, *j_sample, bit_alloc,
    //	  *subband, &frame);
    write_samples_new(*subband, bit_alloc, &frame, &bs);
    //sample_encoding (*subband, bit_alloc, &frame, &bs);
#else
    transmission_pattern (scalar, scfsi, &frame);
    main_bit_allocation (smr, scfsi, bit_alloc, &adb, &frame, &glopts);
    if (error_protection) {
        CRC_calc (&frame, bit_alloc, scfsi, &crc);
    }
    encode_info (&frame, &bs);
    if (error_protection) {
        encode_CRC (crc, &bs);
    }
    encode_bit_alloc (bit_alloc, &frame, &bs);
    encode_scale (bit_alloc, scfsi, scalar, &frame, &bs);
    subband_quantization (scalar, *sb_sample, j_scale, *j_sample, bit_alloc,
            *subband, &frame);
    sample_encoding (*subband, bit_alloc, &frame, &bs);
#endif


    /* If not all the bits were used, write out a stack of zeros */
    for (int i = 0; i < adb; i++) {
        put1bit (&bs, 0);
    }


    if (xpad_len) {
        assert(xpad_len > 2);

        // insert available X-PAD
        for (int i = header.dab_length - xpad_len;
                i < header.dab_length - FPAD_LENGTH;
                i++) {
            putbits (&bs, xpad_data[i], 8);
        }
    }


    for (int i = header.dab_extension - 1; i >= 0; i--) {
        CRC_calcDAB (&frame, bit_alloc, scfsi, scalar, &crc, i);
        /* this crc is for the previous frame in DAB mode  */
        if (bs.buf_byte_idx + lg_frame < bs.buf_size)
            bs.buf[bs.buf_byte_idx + lg_frame] = crc;
        /* reserved 2 bytes for F-PAD in DAB mode  */
        putbits (&bs, crc, 8);
    }

    if (xpad_len) {
        /* The F-PAD is also given us by mot-encoder */
        putbits (&bs, xpad_data[header.dab_length - 2], 8);
        putbits (&bs, xpad_data[header.dab_length - 1], 8);
    }
    else {
        putbits (&bs, 0, 16); // FPAD is all-zero
    }

    return bs.output_buffer_written;
}

// Dump function for psy model comparison
void smr_dump(double smr[2][SBLIMIT], int nch)
{
    fprintf(stdout, "SMR:");

    for (int ch = 0; ch < nch; ch++) {
        if (ch==1) {
            fprintf(stdout, "    ");
        }
        for (int sb = 0; sb < SBLIMIT; sb++) {
            fprintf(stdout, "%3.0f ", smr[ch][sb]);
        }
        fprintf(stdout, "\n");
    }
}