aboutsummaryrefslogtreecommitdiffhomepage
path: root/libaf/af_format.c
blob: 00362a9ab13195e3488a9f7f118fabec7cbd0bd8 (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
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
/* This audio output filter changes the format of a data block. Valid
   formats are: AFMT_U8, AFMT_S8, AFMT_S16_LE, AFMT_S16_BE
   AFMT_U16_LE, AFMT_U16_BE, AFMT_S32_LE and AFMT_S32_BE.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <limits.h>

#include "af.h"
#include "../bswap.h"

// Integer to float conversion through lrintf()
#ifdef HAVE_LRINTF
#define __USE_ISOC99 1
#include <math.h>
#else
#define lrintf(x) ((int)(x))
#endif

/* Functions used by play to convert the input audio to the correct
   format */

/* The below includes retrives functions for converting to and from
   ulaw and alaw */ 
#include "af_format_ulaw.c"
#include "af_format_alaw.c"

// Switch endianess
static void endian(void* in, void* out, int len, int bps);
// From singed to unsigned
static void si2us(void* in, void* out, int len, int bps);
// From unsinged to signed
static void us2si(void* in, void* out, int len, int bps);
// Change the number of bits per sample
static void change_bps(void* in, void* out, int len, int inbps, int outbps);
// From float to int signed
static void float2int(void* in, void* out, int len, int bps);
// From signed int to float
static void int2float(void* in, void* out, int len, int bps);

// Convert from string to format
int af_str2fmt(char* str)
{
  int format=0;
  // Scan for endianess
  if(strstr(str,"be") || strstr(str,"BE"))
    format |= AF_FORMAT_BE;
  else if(strstr(str,"le") || strstr(str,"LE"))
    format |= AF_FORMAT_LE;
  else
    format |= AF_FORMAT_NE;    

  // Scan for special formats
  if(strstr(str,"mulaw") || strstr(str,"MULAW")){
    format |= AF_FORMAT_MU_LAW; return format;
  }
  if(strstr(str,"alaw") || strstr(str,"ALAW")){
    format |= AF_FORMAT_A_LAW; return format;
  }
  if(strstr(str,"ac3") || strstr(str,"AC3")){
    format |= AF_FORMAT_AC3; return format;
  }
  if(strstr(str,"mpeg2") || strstr(str,"MPEG2")){
    format |= AF_FORMAT_MPEG2; return format;
  }
  if(strstr(str,"imaadpcm") || strstr(str,"IMAADPCM")){
    format |= AF_FORMAT_IMA_ADPCM; return format;
  }
  
  // Scan for int/float
  if(strstr(str,"float") || strstr(str,"FLOAT")){
    format |= AF_FORMAT_F; return format;
  }
  else
    format |= AF_FORMAT_I;

  // Scan for signed/unsigned
  if(strstr(str,"unsigned") || strstr(str,"UNSIGNED"))
    format |= AF_FORMAT_US; 
  else
    format |= AF_FORMAT_SI;
  
  return format;
}

inline int af_fmt2bits(int format)
{
    return (format & AF_FORMAT_BITS_MASK)+8;
//    return (((format & AF_FORMAT_BITS_MASK)>>3)+1) * 8;
#if 0
    switch(format & AF_FORMAT_BITS_MASK)
    {
	case AF_FORMAT_8BIT: return 8;
	case AF_FORMAT_16BIT: return 16;
	case AF_FORMAT_24BIT: return 24;
	case AF_FORMAT_32BIT: return 32;
	case AF_FORMAT_48BIT: return 48;
    }
#endif
    return -1;
}

/* Convert format to str input str is a buffer for the 
   converted string, size is the size of the buffer */
char* af_fmt2str(int format, char* str, int size)
{
  int i=0;

  if (size < 1)
    return NULL;
  size--; // reserve one for terminating 0

  // Endianess
  if(AF_FORMAT_LE == (format & AF_FORMAT_END_MASK))
    i+=snprintf(str,size-i,"little endian ");
  else
    i+=snprintf(str,size-i,"big endian ");
  
  if(format & AF_FORMAT_SPECIAL_MASK){
    switch(format & AF_FORMAT_SPECIAL_MASK){
    case(AF_FORMAT_MU_LAW): 
      i+=snprintf(&str[i],size-i,"mu law "); break;
    case(AF_FORMAT_A_LAW): 
      i+=snprintf(&str[i],size-i,"A law "); break;
    case(AF_FORMAT_MPEG2): 
      i+=snprintf(&str[i],size-i,"MPEG 2 "); break;
    case(AF_FORMAT_AC3): 
      i+=snprintf(&str[i],size-i,"AC3 "); break;
    default:
      printf("Unknown special\n");
    }
  }
  else{
    // Bits
    i+=snprintf(&str[i],size-i,"%d-bit ", af_fmt2bits(format));

    // Point
    if(AF_FORMAT_F == (format & AF_FORMAT_POINT_MASK))
      i+=snprintf(&str[i],size-i,"float ");
    else{
      // Sign
      if(AF_FORMAT_US == (format & AF_FORMAT_SIGN_MASK))
	i+=snprintf(&str[i],size-i,"unsigned ");
      else
	i+=snprintf(&str[i],size-i,"signed ");

      i+=snprintf(&str[i],size-i,"int ");
    }
  }
  str[i] = 0; // make sure it is 0 terminated.
  return str;
}

// Helper functions to check sanity for input arguments

// Sanity check for bytes per sample
static int check_bps(int bps)
{
  if(bps != 4 && bps != 3 && bps != 2 && bps != 1){
    af_msg(AF_MSG_ERROR,"[format] The number of bytes per sample" 
	   " must be 1, 2, 3 or 4. Current value is %i \n",bps);
    return AF_ERROR;
  }
  return AF_OK;
}

// Check for unsupported formats
static int check_format(int format)
{
  char buf[256];
  switch(format & AF_FORMAT_SPECIAL_MASK){
  case(AF_FORMAT_MPEG2): 
  case(AF_FORMAT_AC3):
    af_msg(AF_MSG_ERROR,"[format] Sample format %s not yet supported \n",
	 af_fmt2str(format,buf,255)); 
    return AF_ERROR;
  }
  return AF_OK;
}

// Initialization and runtime control
static int control(struct af_instance_s* af, int cmd, void* arg)
{
  switch(cmd){
  case AF_CONTROL_REINIT:{
    char buf1[256];
    char buf2[256];
    // Make sure this filter isn't redundant 
    if(af->data->format == ((af_data_t*)arg)->format && 
       af->data->bps == ((af_data_t*)arg)->bps)
      return AF_DETACH;

    // Check for errors in configuraton
    if((AF_OK != check_bps(((af_data_t*)arg)->bps)) ||
       (AF_OK != check_format(((af_data_t*)arg)->format)) ||
       (AF_OK != check_bps(af->data->bps)) ||
       (AF_OK != check_format(af->data->format)))
      return AF_ERROR;

    af_msg(AF_MSG_VERBOSE,"[format] Changing sample format from %sto %s \n",
	   af_fmt2str(((af_data_t*)arg)->format,buf1,255),
	   af_fmt2str(af->data->format,buf2,255));

    af->data->rate = ((af_data_t*)arg)->rate;
    af->data->nch  = ((af_data_t*)arg)->nch;
    af->mul.n      = af->data->bps;
    af->mul.d      = ((af_data_t*)arg)->bps;
    return AF_OK;
  }
  case AF_CONTROL_COMMAND_LINE:{
    int bps = 2;
    int format = AF_FORMAT_NE;
    char str[256];
    str[0] = '\0';
    sscanf((char*)arg,"%i:%s",&bps,str);
    // Convert string to format
    format = af_str2fmt(str);
    
    // Automatic correction of errors
    switch(format & AF_FORMAT_SPECIAL_MASK){
    case(AF_FORMAT_A_LAW):
    case(AF_FORMAT_MU_LAW): 
      bps=1; break;
    case(AF_FORMAT_AC3):
      bps=4; break; // I think
    }
    if(AF_FORMAT_F == (format & AF_FORMAT_POINT_MASK))
      bps=4;
    
    if((AF_OK != af->control(af,AF_CONTROL_FORMAT_BPS | AF_CONTROL_SET,&bps)) ||
       (AF_OK != af->control(af,AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET,&format)))
      return AF_ERROR;
    return AF_OK;
  }
  case AF_CONTROL_FORMAT_BPS | AF_CONTROL_SET:
    // Reinit must be called after this function has been called
    
    // Check for errors in configuraton
    if(AF_OK != check_bps(*(int*)arg))
      return AF_ERROR;

    af->data->bps = *(int*)arg;
    return AF_OK;
  case AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET:
    // Reinit must be called after this function has been called

    // Check for errors in configuraton
    if(AF_OK != check_format(*(int*)arg))
      return AF_ERROR;

    af->data->format = *(int*)arg;
    return AF_OK;
  }
  return AF_UNKNOWN;
}

// Deallocate memory 
static void uninit(struct af_instance_s* af)
{
  if(af->data)
    free(af->data);
  af->setup = 0;  
}

// Filter data through filter
static af_data_t* play(struct af_instance_s* af, af_data_t* data)
{
  af_data_t*   l   = af->data;	// Local data
  af_data_t*   c   = data;	// Current working data
  int 	       len = c->len/c->bps; // Lenght in samples of current audio block

  if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
    return NULL;

  // Change to cpu native endian format
  if((c->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
    endian(c->audio,c->audio,len,c->bps);

  // Conversion table
  if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_MU_LAW) {
    from_ulaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
    if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
      to_ulaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
    if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
      si2us(l->audio,l->audio,len,l->bps);
  } else if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_A_LAW) {
    from_alaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
    if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
      to_alaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
    if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
      si2us(l->audio,l->audio,len,l->bps);
  } else if((c->format & AF_FORMAT_POINT_MASK) == AF_FORMAT_F) {
    switch(l->format&AF_FORMAT_SPECIAL_MASK){
    case(AF_FORMAT_MU_LAW):
      to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
      break;
    case(AF_FORMAT_A_LAW):
      to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
      break;
    default:
      float2int(c->audio, l->audio, len, l->bps);
      if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
	si2us(l->audio,l->audio,len,l->bps);
      break;
    }
  } else {
    // Input must be int
    
    // Change signed/unsigned
    if((c->format&AF_FORMAT_SIGN_MASK) != (l->format&AF_FORMAT_SIGN_MASK)){
      if((c->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
	us2si(c->audio,c->audio,len,c->bps);
      else
	si2us(c->audio,c->audio,len,c->bps); 
    }
    // Convert to special formats
    switch(l->format&(AF_FORMAT_SPECIAL_MASK|AF_FORMAT_POINT_MASK)){
    case(AF_FORMAT_MU_LAW):
      to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
      break;
    case(AF_FORMAT_A_LAW):
      to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
      break;
    case(AF_FORMAT_F):
      int2float(c->audio, l->audio, len, c->bps);
      break;
    default:
      // Change the number of bits
      if(c->bps != l->bps)
	change_bps(c->audio,l->audio,len,c->bps,l->bps);
      else
	memcpy(l->audio,c->audio,len*c->bps);
      break;
    }
  }

  // Switch from cpu native endian to the correct endianess 
  if((l->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
    endian(l->audio,l->audio,len,l->bps);

  // Set output data
  c->audio  = l->audio;
  c->len    = len*l->bps;
  c->bps    = l->bps;
  c->format = l->format;
  return c;
}

// Allocate memory and set function pointers
static int open(af_instance_t* af){
  af->control=control;
  af->uninit=uninit;
  af->play=play;
  af->mul.n=1;
  af->mul.d=1;
  af->data=calloc(1,sizeof(af_data_t));
  if(af->data == NULL)
    return AF_ERROR;
  return AF_OK;
}

// Description of this filter
af_info_t af_info_format = {
  "Sample format conversion",
  "format",
  "Anders",
  "",
  AF_FLAGS_REENTRANT,
  open
};

static inline uint32_t load24bit(void* data, int pos) {
#if WORDS_BIGENDIAN
  return (((uint32_t)((uint8_t*)data)[3*pos])<<24) |
	 (((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
	 (((uint32_t)((uint8_t*)data)[3*pos+2])<<8);
#else
  return (((uint32_t)((uint8_t*)data)[3*pos])<<8) |
	 (((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
	 (((uint32_t)((uint8_t*)data)[3*pos+2])<<24);
#endif
}

static inline void store24bit(void* data, int pos, uint32_t expanded_value) {
#if WORDS_BIGENDIAN
      ((uint8_t*)data)[3*pos]=expanded_value>>24;
      ((uint8_t*)data)[3*pos+1]=expanded_value>>16;
      ((uint8_t*)data)[3*pos+2]=expanded_value>>8;
#else
      ((uint8_t*)data)[3*pos]=expanded_value>>8;
      ((uint8_t*)data)[3*pos+1]=expanded_value>>16;
      ((uint8_t*)data)[3*pos+2]=expanded_value>>24;
#endif
}

// Function implementations used by play
static void endian(void* in, void* out, int len, int bps)
{
  register int i;
  switch(bps){
    case(2):{
      for(i=0;i<len;i++){
	((uint16_t*)out)[i]=bswap_16(((uint16_t*)in)[i]);
      }
      break;
    }
    case(3):{
      register uint8_t s;
      for(i=0;i<len;i++){
	s=((uint8_t*)in)[3*i];
	((uint8_t*)out)[3*i]=((uint8_t*)in)[3*i+2];
	if (in != out)
	  ((uint8_t*)out)[3*i+1]=((uint8_t*)in)[3*i+1];
	((uint8_t*)out)[3*i+2]=s;
      }
      break;
    }
    case(4):{
      for(i=0;i<len;i++){
	((uint32_t*)out)[i]=bswap_32(((uint32_t*)in)[i]);
      }
      break;
    }
  }
}

static void si2us(void* in, void* out, int len, int bps)
{
  register int i;
  switch(bps){
  case(1):
    for(i=0;i<len;i++)
      ((uint8_t*)out)[i]=(uint8_t)(SCHAR_MAX+((int)((int8_t*)in)[i]));
    break;
  case(2):
    for(i=0;i<len;i++)
      ((uint16_t*)out)[i]=(uint16_t)(SHRT_MAX+((int)((int16_t*)in)[i]));
    break;
  case(3):
    for(i=0;i<len;i++)
      store24bit(out, i, (uint32_t)(INT_MAX+(int32_t)load24bit(in, i)));
    break;
  case(4):
    for(i=0;i<len;i++)
      ((uint32_t*)out)[i]=(uint32_t)(INT_MAX+((int32_t*)in)[i]);
    break;
  }
}

static void us2si(void* in, void* out, int len, int bps)
{
  register int i;
  switch(bps){
  case(1):
    for(i=0;i<len;i++)
      ((int8_t*)out)[i]=(int8_t)(SCHAR_MIN+((int)((uint8_t*)in)[i]));
    break;
  case(2):
    for(i=0;i<len;i++)
      ((int16_t*)out)[i]=(int16_t)(SHRT_MIN+((int)((uint16_t*)in)[i]));
    break;
  case(3):
    for(i=0;i<len;i++)
      store24bit(out, i, (int32_t)(INT_MIN+(uint32_t)load24bit(in, i)));
    break;
  case(4):
    for(i=0;i<len;i++)
      ((int32_t*)out)[i]=(int32_t)(INT_MIN+((uint32_t*)in)[i]);
    break;
  }	
}

static void change_bps(void* in, void* out, int len, int inbps, int outbps)
{
  register int i;
  switch(inbps){
  case(1):
    switch(outbps){
    case(2):
      for(i=0;i<len;i++)
	((uint16_t*)out)[i]=((uint16_t)((uint8_t*)in)[i])<<8;
      break;
    case(3):
      for(i=0;i<len;i++)
	store24bit(out, i, ((uint32_t)((uint8_t*)in)[i])<<24);
      break;
    case(4):
      for(i=0;i<len;i++)
	((uint32_t*)out)[i]=((uint32_t)((uint8_t*)in)[i])<<24;
      break;
    }
    break;
  case(2):
    switch(outbps){
    case(1):
      for(i=0;i<len;i++)
	((uint8_t*)out)[i]=(uint8_t)((((uint16_t*)in)[i])>>8);
      break;
    case(3):
      for(i=0;i<len;i++)
	store24bit(out, i, ((uint32_t)((uint16_t*)in)[i])<<16);
      break;
    case(4):
      for(i=0;i<len;i++)
	((uint32_t*)out)[i]=((uint32_t)((uint16_t*)in)[i])<<16;
      break;
    }
    break;
  case(3):
    switch(outbps){
    case(1):
      for(i=0;i<len;i++)
	((uint8_t*)out)[i]=(uint8_t)(load24bit(in, i)>>24);
      break;
    case(2):
      for(i=0;i<len;i++)
	((uint16_t*)out)[i]=(uint16_t)(load24bit(in, i)>>16);
      break;
    case(4):
      for(i=0;i<len;i++)
	((uint32_t*)out)[i]=(uint32_t)load24bit(in, i);
      break;
    }
    break;      
  case(4):
    switch(outbps){
    case(1):
      for(i=0;i<len;i++)
	((uint8_t*)out)[i]=(uint8_t)((((uint32_t*)in)[i])>>24);
      break;
    case(2):
      for(i=0;i<len;i++)
	((uint16_t*)out)[i]=(uint16_t)((((uint32_t*)in)[i])>>16);
      break;
    case(3):
      for(i=0;i<len;i++)
        store24bit(out, i, ((uint32_t*)in)[i]);
      break;
    }
    break;      
  }
}

static void float2int(void* in, void* out, int len, int bps)
{
  register int i;
  switch(bps){
  case(1):
    for(i=0;i<len;i++)
      ((int8_t*)out)[i]=(int8_t)lrintf(SCHAR_MAX*((float*)in)[i]);
    break;
  case(2): 
    for(i=0;i<len;i++)
      ((int16_t*)out)[i]=(int16_t)lrintf(SHRT_MAX*((float*)in)[i]);
    break;
  case(3):
    for(i=0;i<len;i++)
      store24bit(out, i, (int32_t)lrintf(INT_MAX*((float*)in)[i]));
    break;
  case(4):
    for(i=0;i<len;i++)
      ((int32_t*)out)[i]=(int32_t)lrintf(INT_MAX*((float*)in)[i]);
    break;
  }	
}

static void int2float(void* in, void* out, int len, int bps)
{
  register int i;
  switch(bps){
  case(1):
    for(i=0;i<len;i++)
      ((float*)out)[i]=(1.0/SCHAR_MAX)*((float)((int8_t*)in)[i]);
    break;
  case(2):
    for(i=0;i<len;i++)
      ((float*)out)[i]=(1.0/SHRT_MAX)*((float)((int16_t*)in)[i]);
    break;
  case(3):
    for(i=0;i<len;i++)
      ((float*)out)[i]=(1.0/INT_MAX)*((float)((int32_t)load24bit(in, i)));
    break;
  case(4):
    for(i=0;i<len;i++)
      ((float*)out)[i]=(1.0/INT_MAX)*((float)((int32_t*)in)[i]);
    break;
  }	
}