libaf/af_format.c

   1 /* This audio output filter changes the format of a data block. Valid
   2    formats are: AFMT_U8, AFMT_S8, AFMT_S16_LE, AFMT_S16_BE
   3    AFMT_U16_LE, AFMT_U16_BE, AFMT_S32_LE and AFMT_S32_BE.
   4 */
   5
   6 // Must be defined before any libc headers are included!
   7 #define _ISOC9X_SOURCE
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <inttypes.h>
  14 #include <limits.h>
  15
  16 #include "af.h"
  17 #include "bswap.h"
  18 #include "libvo/fastmemcpy.h"
  19
  20 // Integer to float conversion through lrintf()
  21 #ifdef HAVE_LRINTF
  22 #include <math.h>
  23 long int lrintf(float);
  24 #else
  25 #define lrintf(x) ((int)(x))
  26 #endif
  27
  28 /* Functions used by play to convert the input audio to the correct
  29    format */
  30
  31 /* The below includes retrives functions for converting to and from
  32    ulaw and alaw */
  33 #include "af_format_ulaw.c"
  34 #include "af_format_alaw.c"
  35
  36 // Switch endianess
  37 static void endian(void* in, void* out, int len, int bps);
  38 // From singed to unsigned and the other way
  39 static void si2us(void* data, int len, int bps);
  40 // Change the number of bits per sample
  41 static void change_bps(void* in, void* out, int len, int inbps, int outbps);
  42 // From float to int signed
  43 static void float2int(float* in, void* out, int len, int bps);
  44 // From signed int to float
  45 static void int2float(void* in, float* out, int len, int bps);
  46
  47 static af_data_t* play(struct af_instance_s* af, af_data_t* data);
  48 static af_data_t* play_swapendian(struct af_instance_s* af, af_data_t* data);
  49 static af_data_t* play_float_s16(struct af_instance_s* af, af_data_t* data);
  50 static af_data_t* play_s16_float(struct af_instance_s* af, af_data_t* data);
  51
  52 // Helper functions to check sanity for input arguments
  53
  54 // Sanity check for bytes per sample
  55 static int check_bps(int bps)
  56 {
  57   if(bps != 4 && bps != 3 && bps != 2 && bps != 1){
  58     af_msg(AF_MSG_ERROR,"[format] The number of bytes per sample"
  59            " must be 1, 2, 3 or 4. Current value is %i \n",bps);
  60     return AF_ERROR;
  61   }
  62   return AF_OK;
  63 }
  64
  65 // Check for unsupported formats
  66 static int check_format(int format)
  67 {
  68   char buf[256];
  69   switch(format & AF_FORMAT_SPECIAL_MASK){
  70   case(AF_FORMAT_IMA_ADPCM):
  71   case(AF_FORMAT_MPEG2):
  72   case(AF_FORMAT_AC3):
  73     af_msg(AF_MSG_ERROR,"[format] Sample format %s not yet supported \n",
  74          af_fmt2str(format,buf,256));
  75     return AF_ERROR;
  76   }
  77   return AF_OK;
  78 }
  79
  80 // Initialization and runtime control
  81 static int control(struct af_instance_s* af, int cmd, void* arg)
  82 {
  83   switch(cmd){
  84   case AF_CONTROL_REINIT:{
  85     char buf1[256];
  86     char buf2[256];
  87     af_data_t *data = arg;
  88
  89     // Make sure this filter isn't redundant
  90     if(af->data->format == data->format &&
  91        af->data->bps == data->bps)
  92       return AF_DETACH;
  93
  94     // Check for errors in configuraton
  95     if((AF_OK != check_bps(data->bps)) ||
  96        (AF_OK != check_format(data->format)) ||
  97        (AF_OK != check_bps(af->data->bps)) ||
  98        (AF_OK != check_format(af->data->format)))
  99       return AF_ERROR;
 100
 101     af_msg(AF_MSG_VERBOSE,"[format] Changing sample format from %s to %s\n",
 102            af_fmt2str(data->format,buf1,256),
 103            af_fmt2str(af->data->format,buf2,256));
 104
 105     af->data->rate = data->rate;
 106     af->data->nch  = data->nch;
 107     af->mul.n      = af->data->bps;
 108     af->mul.d      = data->bps;
 109     af_frac_cancel(&af->mul);
 110
 111     af->play = play; // set default
 112
 113     // look whether only endianess differences are there
 114     if ((af->data->format & ~AF_FORMAT_END_MASK) ==
 115         (data->format & ~AF_FORMAT_END_MASK))
 116     {
 117         af_msg(AF_MSG_VERBOSE,"[format] Accelerated endianess conversion only\n");
 118         af->play = play_swapendian;
 119     }
 120     if ((data->format == AF_FORMAT_FLOAT_NE) &&
 121         (af->data->format == AF_FORMAT_S16_NE))
 122     {
 123         af_msg(AF_MSG_VERBOSE,"[format] Accelerated %s to %s conversion\n",
 124            af_fmt2str(data->format,buf1,256),
 125            af_fmt2str(af->data->format,buf2,256));
 126         af->play = play_float_s16;
 127     }
 128     if ((data->format == AF_FORMAT_S16_NE) &&
 129         (af->data->format == AF_FORMAT_FLOAT_NE))
 130     {
 131         af_msg(AF_MSG_VERBOSE,"[format] Accelerated %s to %s conversion\n",
 132            af_fmt2str(data->format,buf1,256),
 133            af_fmt2str(af->data->format,buf2,256));
 134         af->play = play_s16_float;
 135     }
 136     return AF_OK;
 137   }
 138   case AF_CONTROL_COMMAND_LINE:{
 139     int format = af_str2fmt_short(arg);
 140     if (format == -1) {
 141       af_msg(AF_MSG_ERROR, "[format] %s is not a valid format\n", (char *)arg);
 142       return AF_ERROR;
 143     }
 144     if(AF_OK != af->control(af,AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET,&format))
 145       return AF_ERROR;
 146     return AF_OK;
 147   }
 148   case AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET:{
 149     // Check for errors in configuraton
 150     if(AF_OK != check_format(*(int*)arg))
 151       return AF_ERROR;
 152
 153     af->data->format = *(int*)arg;
 154     af->data->bps = af_fmt2bits(af->data->format)/8;
 155
 156     return AF_OK;
 157   }
 158   }
 159   return AF_UNKNOWN;
 160 }
 161
 162 // Deallocate memory
 163 static void uninit(struct af_instance_s* af)
 164 {
 165   if(af->data)
 166     free(af->data);
 167   af->setup = 0;
 168 }
 169
 170 static af_data_t* play_swapendian(struct af_instance_s* af, af_data_t* data)
 171 {
 172   af_data_t*   l   = af->data;  // Local data
 173   af_data_t*   c   = data;      // Current working data
 174   int          len = c->len/c->bps; // Lenght in samples of current audio block
 175
 176   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 177     return NULL;
 178
 179   endian(c->audio,l->audio,len,c->bps);
 180
 181   c->audio = l->audio;
 182   c->format = l->format;
 183
 184   return c;
 185 }
 186
 187 static af_data_t* play_float_s16(struct af_instance_s* af, af_data_t* data)
 188 {
 189   af_data_t*   l   = af->data;  // Local data
 190   af_data_t*   c   = data;      // Current working data
 191   int          len = c->len/4; // Lenght in samples of current audio block
 192
 193   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 194     return NULL;
 195
 196   float2int(c->audio, l->audio, len, 2);
 197
 198   c->audio = l->audio;
 199   c->len = len*2;
 200   c->bps = 2;
 201   c->format = l->format;
 202
 203   return c;
 204 }
 205
 206 static af_data_t* play_s16_float(struct af_instance_s* af, af_data_t* data)
 207 {
 208   af_data_t*   l   = af->data;  // Local data
 209   af_data_t*   c   = data;      // Current working data
 210   int          len = c->len/2; // Lenght in samples of current audio block
 211
 212   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 213     return NULL;
 214
 215   int2float(c->audio, l->audio, len, 2);
 216
 217   c->audio = l->audio;
 218   c->len = len*4;
 219   c->bps = 4;
 220   c->format = l->format;
 221
 222   return c;
 223 }
 224
 225 // Filter data through filter
 226 static af_data_t* play(struct af_instance_s* af, af_data_t* data)
 227 {
 228   af_data_t*   l   = af->data;  // Local data
 229   af_data_t*   c   = data;      // Current working data
 230   int          len = c->len/c->bps; // Lenght in samples of current audio block
 231
 232   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 233     return NULL;
 234
 235   // Change to cpu native endian format
 236   if((c->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
 237     endian(c->audio,c->audio,len,c->bps);
 238
 239   // Conversion table
 240   if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_MU_LAW) {
 241     from_ulaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
 242     if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
 243       to_ulaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
 244     if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
 245       si2us(l->audio,len,l->bps);
 246   } else if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_A_LAW) {
 247     from_alaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
 248     if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
 249       to_alaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
 250     if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
 251       si2us(l->audio,len,l->bps);
 252   } else if((c->format & AF_FORMAT_POINT_MASK) == AF_FORMAT_F) {
 253     switch(l->format&AF_FORMAT_SPECIAL_MASK){
 254     case(AF_FORMAT_MU_LAW):
 255       to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 256       break;
 257     case(AF_FORMAT_A_LAW):
 258       to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 259       break;
 260     default:
 261       float2int(c->audio, l->audio, len, l->bps);
 262       if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
 263         si2us(l->audio,len,l->bps);
 264       break;
 265     }
 266   } else {
 267     // Input must be int
 268
 269     // Change signed/unsigned
 270     if((c->format&AF_FORMAT_SIGN_MASK) != (l->format&AF_FORMAT_SIGN_MASK)){
 271       si2us(c->audio,len,c->bps);
 272     }
 273     // Convert to special formats
 274     switch(l->format&(AF_FORMAT_SPECIAL_MASK|AF_FORMAT_POINT_MASK)){
 275     case(AF_FORMAT_MU_LAW):
 276       to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 277       break;
 278     case(AF_FORMAT_A_LAW):
 279       to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 280       break;
 281     case(AF_FORMAT_F):
 282       int2float(c->audio, l->audio, len, c->bps);
 283       break;
 284     default:
 285       // Change the number of bits
 286       if(c->bps != l->bps)
 287         change_bps(c->audio,l->audio,len,c->bps,l->bps);
 288       else
 289         memcpy(l->audio,c->audio,len*c->bps);
 290       break;
 291     }
 292   }
 293
 294   // Switch from cpu native endian to the correct endianess
 295   if((l->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
 296     endian(l->audio,l->audio,len,l->bps);
 297
 298   // Set output data
 299   c->audio  = l->audio;
 300   c->len    = len*l->bps;
 301   c->bps    = l->bps;
 302   c->format = l->format;
 303   return c;
 304 }
 305
 306 // Allocate memory and set function pointers
 307 static int open(af_instance_t* af){
 308   af->control=control;
 309   af->uninit=uninit;
 310   af->play=play;
 311   af->mul.n=1;
 312   af->mul.d=1;
 313   af->data=calloc(1,sizeof(af_data_t));
 314   if(af->data == NULL)
 315     return AF_ERROR;
 316   return AF_OK;
 317 }
 318
 319 // Description of this filter
 320 af_info_t af_info_format = {
 321   "Sample format conversion",
 322   "format",
 323   "Anders",
 324   "",
 325   AF_FLAGS_REENTRANT,
 326   open
 327 };
 328
 329 static inline uint32_t load24bit(void* data, int pos) {
 330 #if WORDS_BIGENDIAN
 331   return (((uint32_t)((uint8_t*)data)[3*pos])<<24) |
 332          (((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
 333          (((uint32_t)((uint8_t*)data)[3*pos+2])<<8);
 334 #else
 335   return (((uint32_t)((uint8_t*)data)[3*pos])<<8) |
 336          (((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
 337          (((uint32_t)((uint8_t*)data)[3*pos+2])<<24);
 338 #endif
 339 }
 340
 341 static inline void store24bit(void* data, int pos, uint32_t expanded_value) {
 342 #if WORDS_BIGENDIAN
 343       ((uint8_t*)data)[3*pos]=expanded_value>>24;
 344       ((uint8_t*)data)[3*pos+1]=expanded_value>>16;
 345       ((uint8_t*)data)[3*pos+2]=expanded_value>>8;
 346 #else
 347       ((uint8_t*)data)[3*pos]=expanded_value>>8;
 348       ((uint8_t*)data)[3*pos+1]=expanded_value>>16;
 349       ((uint8_t*)data)[3*pos+2]=expanded_value>>24;
 350 #endif
 351 }
 352
 353 // Function implementations used by play
 354 static void endian(void* in, void* out, int len, int bps)
 355 {
 356   register int i;
 357   switch(bps){
 358     case(2):{
 359       for(i=0;i<len;i++){
 360         ((uint16_t*)out)[i]=bswap_16(((uint16_t*)in)[i]);
 361       }
 362       break;
 363     }
 364     case(3):{
 365       register uint8_t s;
 366       for(i=0;i<len;i++){
 367         s=((uint8_t*)in)[3*i];
 368         ((uint8_t*)out)[3*i]=((uint8_t*)in)[3*i+2];
 369         if (in != out)
 370           ((uint8_t*)out)[3*i+1]=((uint8_t*)in)[3*i+1];
 371         ((uint8_t*)out)[3*i+2]=s;
 372       }
 373       break;
 374     }
 375     case(4):{
 376       for(i=0;i<len;i++){
 377         ((uint32_t*)out)[i]=bswap_32(((uint32_t*)in)[i]);
 378       }
 379       break;
 380     }
 381   }
 382 }
 383
 384 static void si2us(void* data, int len, int bps)
 385 {
 386   register long i = -(len * bps);
 387   register uint8_t *p = &((uint8_t *)data)[len * bps];
 388 #if AF_FORMAT_NE == AF_FORMAT_LE
 389   p += bps - 1;
 390 #endif
 391   if (len <= 0) return;
 392   do {
 393     p[i] ^= 0x80;
 394   } while (i += bps);
 395 }
 396
 397 static void change_bps(void* in, void* out, int len, int inbps, int outbps)
 398 {
 399   register int i;
 400   switch(inbps){
 401   case(1):
 402     switch(outbps){
 403     case(2):
 404       for(i=0;i<len;i++)
 405         ((uint16_t*)out)[i]=((uint16_t)((uint8_t*)in)[i])<<8;
 406       break;
 407     case(3):
 408       for(i=0;i<len;i++)
 409         store24bit(out, i, ((uint32_t)((uint8_t*)in)[i])<<24);
 410       break;
 411     case(4):
 412       for(i=0;i<len;i++)
 413         ((uint32_t*)out)[i]=((uint32_t)((uint8_t*)in)[i])<<24;
 414       break;
 415     }
 416     break;
 417   case(2):
 418     switch(outbps){
 419     case(1):
 420       for(i=0;i<len;i++)
 421         ((uint8_t*)out)[i]=(uint8_t)((((uint16_t*)in)[i])>>8);
 422       break;
 423     case(3):
 424       for(i=0;i<len;i++)
 425         store24bit(out, i, ((uint32_t)((uint16_t*)in)[i])<<16);
 426       break;
 427     case(4):
 428       for(i=0;i<len;i++)
 429         ((uint32_t*)out)[i]=((uint32_t)((uint16_t*)in)[i])<<16;
 430       break;
 431     }
 432     break;
 433   case(3):
 434     switch(outbps){
 435     case(1):
 436       for(i=0;i<len;i++)
 437         ((uint8_t*)out)[i]=(uint8_t)(load24bit(in, i)>>24);
 438       break;
 439     case(2):
 440       for(i=0;i<len;i++)
 441         ((uint16_t*)out)[i]=(uint16_t)(load24bit(in, i)>>16);
 442       break;
 443     case(4):
 444       for(i=0;i<len;i++)
 445         ((uint32_t*)out)[i]=(uint32_t)load24bit(in, i);
 446       break;
 447     }
 448     break;
 449   case(4):
 450     switch(outbps){
 451     case(1):
 452       for(i=0;i<len;i++)
 453         ((uint8_t*)out)[i]=(uint8_t)((((uint32_t*)in)[i])>>24);
 454       break;
 455     case(2):
 456       for(i=0;i<len;i++)
 457         ((uint16_t*)out)[i]=(uint16_t)((((uint32_t*)in)[i])>>16);
 458       break;
 459     case(3):
 460       for(i=0;i<len;i++)
 461         store24bit(out, i, ((uint32_t*)in)[i]);
 462       break;
 463     }
 464     break;
 465   }
 466 }
 467
 468 static void float2int(float* in, void* out, int len, int bps)
 469 {
 470   register int i;
 471   switch(bps){
 472   case(1):
 473     for(i=0;i<len;i++)
 474       ((int8_t*)out)[i] = lrintf(127.0 * in[i]);
 475     break;
 476   case(2):
 477     for(i=0;i<len;i++)
 478       ((int16_t*)out)[i] = lrintf(32767.0 * in[i]);
 479     break;
 480   case(3):
 481     for(i=0;i<len;i++)
 482       store24bit(out, i, lrintf(2147483647.0 * in[i]));
 483     break;
 484   case(4):
 485     for(i=0;i<len;i++)
 486       ((int32_t*)out)[i] = lrintf(2147483647.0 * in[i]);
 487     break;
 488   }
 489 }
 490
 491 static void int2float(void* in, float* out, int len, int bps)
 492 {
 493   register int i;
 494   switch(bps){
 495   case(1):
 496     for(i=0;i<len;i++)
 497       out[i]=(1.0/128.0)*((int8_t*)in)[i];
 498     break;
 499   case(2):
 500     for(i=0;i<len;i++)
 501       out[i]=(1.0/32768.0)*((int16_t*)in)[i];
 502     break;
 503   case(3):
 504     for(i=0;i<len;i++)
 505       out[i]=(1.0/2147483648.0)*((int32_t)load24bit(in, i));
 506     break;
 507   case(4):
 508     for(i=0;i<len;i++)
 509       out[i]=(1.0/2147483648.0)*((int32_t*)in)[i];
 510     break;
 511   }
 512 }