libaf/af_format.c

   1 /*
   2  * This audio filter changes the format of a data block. Valid
   3  * formats are: AFMT_U8, AFMT_S8, AFMT_S16_LE, AFMT_S16_BE
   4  * AFMT_U16_LE, AFMT_U16_BE, AFMT_S32_LE and AFMT_S32_BE.
   5  *
   6  * This file is part of MPlayer.
   7  *
   8  * MPlayer is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * MPlayer is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <inttypes.h>
  27 #include <limits.h>
  28 #include <math.h>
  29
  30 #include "config.h"
  31 #include "af.h"
  32 #include "mpbswap.h"
  33 #include "libvo/fastmemcpy.h"
  34
  35 /* Functions used by play to convert the input audio to the correct
  36    format */
  37
  38 /* The below includes retrieves functions for converting to and from
  39    ulaw and alaw */
  40 #include "af_format_ulaw.h"
  41 #include "af_format_alaw.h"
  42
  43 // Switch endianness
  44 static void endian(void* in, void* out, int len, int bps);
  45 // From signed to unsigned and the other way
  46 static void si2us(void* data, int len, int bps);
  47 // Change the number of bits per sample
  48 static void change_bps(void* in, void* out, int len, int inbps, int outbps);
  49 // From float to int signed
  50 static void float2int(float* in, void* out, int len, int bps);
  51 // From signed int to float
  52 static void int2float(void* in, float* out, int len, int bps);
  53
  54 static af_data_t* play(struct af_instance_s* af, af_data_t* data);
  55 static af_data_t* play_swapendian(struct af_instance_s* af, af_data_t* data);
  56 static af_data_t* play_float_s16(struct af_instance_s* af, af_data_t* data);
  57 static af_data_t* play_s16_float(struct af_instance_s* af, af_data_t* data);
  58
  59 // Helper functions to check sanity for input arguments
  60
  61 // Sanity check for bytes per sample
  62 static int check_bps(int bps)
  63 {
  64   if(bps != 4 && bps != 3 && bps != 2 && bps != 1){
  65     mp_msg(MSGT_AFILTER, MSGL_ERR, "[format] The number of bytes per sample"
  66            " must be 1, 2, 3 or 4. Current value is %i \n",bps);
  67     return AF_ERROR;
  68   }
  69   return AF_OK;
  70 }
  71
  72 // Check for unsupported formats
  73 static int check_format(int format)
  74 {
  75   char buf[256];
  76   switch(format & AF_FORMAT_SPECIAL_MASK){
  77   case(AF_FORMAT_IMA_ADPCM):
  78   case(AF_FORMAT_MPEG2):
  79   case(AF_FORMAT_AC3):
  80     mp_msg(MSGT_AFILTER, MSGL_ERR, "[format] Sample format %s not yet supported \n",
  81          af_fmt2str(format,buf,256));
  82     return AF_ERROR;
  83   }
  84   return AF_OK;
  85 }
  86
  87 // Initialization and runtime control
  88 static int control(struct af_instance_s* af, int cmd, void* arg)
  89 {
  90   switch(cmd){
  91   case AF_CONTROL_REINIT:{
  92     char buf1[256];
  93     char buf2[256];
  94     af_data_t *data = arg;
  95
  96     // Make sure this filter isn't redundant
  97     if(af->data->format == data->format &&
  98        af->data->bps == data->bps)
  99       return AF_DETACH;
 100
 101     // Allow trivial AC3-endianness conversion
 102     if (!AF_FORMAT_IS_AC3(af->data->format) || !AF_FORMAT_IS_AC3(data->format))
 103     // Check for errors in configuration
 104     if((AF_OK != check_bps(data->bps)) ||
 105        (AF_OK != check_format(data->format)) ||
 106        (AF_OK != check_bps(af->data->bps)) ||
 107        (AF_OK != check_format(af->data->format)))
 108       return AF_ERROR;
 109
 110     mp_msg(MSGT_AFILTER, MSGL_V, "[format] Changing sample format from %s to %s\n",
 111            af_fmt2str(data->format,buf1,256),
 112            af_fmt2str(af->data->format,buf2,256));
 113
 114     af->data->rate = data->rate;
 115     af->data->nch  = data->nch;
 116     af->mul        = (double)af->data->bps / data->bps;
 117
 118     af->play = play; // set default
 119
 120     // look whether only endianness differences are there
 121     if ((af->data->format & ~AF_FORMAT_END_MASK) ==
 122         (data->format & ~AF_FORMAT_END_MASK))
 123     {
 124         mp_msg(MSGT_AFILTER, MSGL_V, "[format] Accelerated endianness conversion only\n");
 125         af->play = play_swapendian;
 126     }
 127     if ((data->format == AF_FORMAT_FLOAT_NE) &&
 128         (af->data->format == AF_FORMAT_S16_NE))
 129     {
 130         mp_msg(MSGT_AFILTER, MSGL_V, "[format] Accelerated %s to %s conversion\n",
 131            af_fmt2str(data->format,buf1,256),
 132            af_fmt2str(af->data->format,buf2,256));
 133         af->play = play_float_s16;
 134     }
 135     if ((data->format == AF_FORMAT_S16_NE) &&
 136         (af->data->format == AF_FORMAT_FLOAT_NE))
 137     {
 138         mp_msg(MSGT_AFILTER, MSGL_V, "[format] Accelerated %s to %s conversion\n",
 139            af_fmt2str(data->format,buf1,256),
 140            af_fmt2str(af->data->format,buf2,256));
 141         af->play = play_s16_float;
 142     }
 143     return AF_OK;
 144   }
 145   case AF_CONTROL_COMMAND_LINE:{
 146     int format = af_str2fmt_short(arg);
 147     if (format == -1) {
 148       mp_msg(MSGT_AFILTER, MSGL_ERR, "[format] %s is not a valid format\n", (char *)arg);
 149       return AF_ERROR;
 150     }
 151     if(AF_OK != af->control(af,AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET,&format))
 152       return AF_ERROR;
 153     return AF_OK;
 154   }
 155   case AF_CONTROL_FORMAT_FMT | AF_CONTROL_SET:{
 156     // Check for errors in configuration
 157     if(!AF_FORMAT_IS_AC3(*(int*)arg) && AF_OK != check_format(*(int*)arg))
 158       return AF_ERROR;
 159
 160     af->data->format = *(int*)arg;
 161     af->data->bps = af_fmt2bits(af->data->format)/8;
 162
 163     return AF_OK;
 164   }
 165   }
 166   return AF_UNKNOWN;
 167 }
 168
 169 // Deallocate memory
 170 static void uninit(struct af_instance_s* af)
 171 {
 172   if (af->data)
 173       free(af->data->audio);
 174   free(af->data);
 175   af->setup = 0;
 176 }
 177
 178 static af_data_t* play_swapendian(struct af_instance_s* af, af_data_t* data)
 179 {
 180   af_data_t*   l   = af->data;  // Local data
 181   af_data_t*   c   = data;      // Current working data
 182   int          len = c->len/c->bps; // Length in samples of current audio block
 183
 184   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 185     return NULL;
 186
 187   endian(c->audio,l->audio,len,c->bps);
 188
 189   c->audio = l->audio;
 190   c->format = l->format;
 191
 192   return c;
 193 }
 194
 195 static af_data_t* play_float_s16(struct af_instance_s* af, af_data_t* data)
 196 {
 197   af_data_t*   l   = af->data;  // Local data
 198   af_data_t*   c   = data;      // Current working data
 199   int          len = c->len/4; // Length in samples of current audio block
 200
 201   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 202     return NULL;
 203
 204   float2int(c->audio, l->audio, len, 2);
 205
 206   c->audio = l->audio;
 207   c->len = len*2;
 208   c->bps = 2;
 209   c->format = l->format;
 210
 211   return c;
 212 }
 213
 214 static af_data_t* play_s16_float(struct af_instance_s* af, af_data_t* data)
 215 {
 216   af_data_t*   l   = af->data;  // Local data
 217   af_data_t*   c   = data;      // Current working data
 218   int          len = c->len/2; // Length in samples of current audio block
 219
 220   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 221     return NULL;
 222
 223   int2float(c->audio, l->audio, len, 2);
 224
 225   c->audio = l->audio;
 226   c->len = len*4;
 227   c->bps = 4;
 228   c->format = l->format;
 229
 230   return c;
 231 }
 232
 233 // Filter data through filter
 234 static af_data_t* play(struct af_instance_s* af, af_data_t* data)
 235 {
 236   af_data_t*   l   = af->data;  // Local data
 237   af_data_t*   c   = data;      // Current working data
 238   int          len = c->len/c->bps; // Length in samples of current audio block
 239
 240   if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
 241     return NULL;
 242
 243   // Change to cpu native endian format
 244   if((c->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
 245     endian(c->audio,c->audio,len,c->bps);
 246
 247   // Conversion table
 248   if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_MU_LAW) {
 249     from_ulaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
 250     if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
 251       to_ulaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
 252     if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
 253       si2us(l->audio,len,l->bps);
 254   } else if((c->format & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_A_LAW) {
 255     from_alaw(c->audio, l->audio, len, l->bps, l->format&AF_FORMAT_POINT_MASK);
 256     if(AF_FORMAT_A_LAW == (l->format&AF_FORMAT_SPECIAL_MASK))
 257       to_alaw(l->audio, l->audio, len, 1, AF_FORMAT_SI);
 258     if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
 259       si2us(l->audio,len,l->bps);
 260   } else if((c->format & AF_FORMAT_POINT_MASK) == AF_FORMAT_F) {
 261     switch(l->format&AF_FORMAT_SPECIAL_MASK){
 262     case(AF_FORMAT_MU_LAW):
 263       to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 264       break;
 265     case(AF_FORMAT_A_LAW):
 266       to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 267       break;
 268     default:
 269       float2int(c->audio, l->audio, len, l->bps);
 270       if((l->format&AF_FORMAT_SIGN_MASK) == AF_FORMAT_US)
 271         si2us(l->audio,len,l->bps);
 272       break;
 273     }
 274   } else {
 275     // Input must be int
 276
 277     // Change signed/unsigned
 278     if((c->format&AF_FORMAT_SIGN_MASK) != (l->format&AF_FORMAT_SIGN_MASK)){
 279       si2us(c->audio,len,c->bps);
 280     }
 281     // Convert to special formats
 282     switch(l->format&(AF_FORMAT_SPECIAL_MASK|AF_FORMAT_POINT_MASK)){
 283     case(AF_FORMAT_MU_LAW):
 284       to_ulaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 285       break;
 286     case(AF_FORMAT_A_LAW):
 287       to_alaw(c->audio, l->audio, len, c->bps, c->format&AF_FORMAT_POINT_MASK);
 288       break;
 289     case(AF_FORMAT_F):
 290       int2float(c->audio, l->audio, len, c->bps);
 291       break;
 292     default:
 293       // Change the number of bits
 294       if(c->bps != l->bps)
 295         change_bps(c->audio,l->audio,len,c->bps,l->bps);
 296       else
 297         fast_memcpy(l->audio,c->audio,len*c->bps);
 298       break;
 299     }
 300   }
 301
 302   // Switch from cpu native endian to the correct endianness
 303   if((l->format&AF_FORMAT_END_MASK)!=AF_FORMAT_NE)
 304     endian(l->audio,l->audio,len,l->bps);
 305
 306   // Set output data
 307   c->audio  = l->audio;
 308   c->len    = len*l->bps;
 309   c->bps    = l->bps;
 310   c->format = l->format;
 311   return c;
 312 }
 313
 314 // Allocate memory and set function pointers
 315 static int af_open(af_instance_t* af){
 316   af->control=control;
 317   af->uninit=uninit;
 318   af->play=play;
 319   af->mul=1;
 320   af->data=calloc(1,sizeof(af_data_t));
 321   if(af->data == NULL)
 322     return AF_ERROR;
 323   return AF_OK;
 324 }
 325
 326 // Description of this filter
 327 af_info_t af_info_format = {
 328   "Sample format conversion",
 329   "format",
 330   "Anders",
 331   "",
 332   AF_FLAGS_REENTRANT,
 333   af_open
 334 };
 335
 336 static inline uint32_t load24bit(void* data, int pos) {
 337 #if HAVE_BIGENDIAN
 338   return (((uint32_t)((uint8_t*)data)[3*pos])<<24) |
 339          (((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
 340          (((uint32_t)((uint8_t*)data)[3*pos+2])<<8);
 341 #else
 342   return (((uint32_t)((uint8_t*)data)[3*pos])<<8) |
 343          (((uint32_t)((uint8_t*)data)[3*pos+1])<<16) |
 344          (((uint32_t)((uint8_t*)data)[3*pos+2])<<24);
 345 #endif
 346 }
 347
 348 static inline void store24bit(void* data, int pos, uint32_t expanded_value) {
 349 #if HAVE_BIGENDIAN
 350       ((uint8_t*)data)[3*pos]=expanded_value>>24;
 351       ((uint8_t*)data)[3*pos+1]=expanded_value>>16;
 352       ((uint8_t*)data)[3*pos+2]=expanded_value>>8;
 353 #else
 354       ((uint8_t*)data)[3*pos]=expanded_value>>8;
 355       ((uint8_t*)data)[3*pos+1]=expanded_value>>16;
 356       ((uint8_t*)data)[3*pos+2]=expanded_value>>24;
 357 #endif
 358 }
 359
 360 // Function implementations used by play
 361 static void endian(void* in, void* out, int len, int bps)
 362 {
 363   register int i;
 364   switch(bps){
 365     case(2):{
 366       for(i=0;i<len;i++){
 367         ((uint16_t*)out)[i]=bswap_16(((uint16_t*)in)[i]);
 368       }
 369       break;
 370     }
 371     case(3):{
 372       register uint8_t s;
 373       for(i=0;i<len;i++){
 374         s=((uint8_t*)in)[3*i];
 375         ((uint8_t*)out)[3*i]=((uint8_t*)in)[3*i+2];
 376         if (in != out)
 377           ((uint8_t*)out)[3*i+1]=((uint8_t*)in)[3*i+1];
 378         ((uint8_t*)out)[3*i+2]=s;
 379       }
 380       break;
 381     }
 382     case(4):{
 383       for(i=0;i<len;i++){
 384         ((uint32_t*)out)[i]=bswap_32(((uint32_t*)in)[i]);
 385       }
 386       break;
 387     }
 388   }
 389 }
 390
 391 static void si2us(void* data, int len, int bps)
 392 {
 393   register long i = -(len * bps);
 394   register uint8_t *p = &((uint8_t *)data)[len * bps];
 395 #if AF_FORMAT_NE == AF_FORMAT_LE
 396   p += bps - 1;
 397 #endif
 398   if (len <= 0) return;
 399   do {
 400     p[i] ^= 0x80;
 401   } while (i += bps);
 402 }
 403
 404 static void change_bps(void* in, void* out, int len, int inbps, int outbps)
 405 {
 406   register int i;
 407   switch(inbps){
 408   case(1):
 409     switch(outbps){
 410     case(2):
 411       for(i=0;i<len;i++)
 412         ((uint16_t*)out)[i]=((uint16_t)((uint8_t*)in)[i])<<8;
 413       break;
 414     case(3):
 415       for(i=0;i<len;i++)
 416         store24bit(out, i, ((uint32_t)((uint8_t*)in)[i])<<24);
 417       break;
 418     case(4):
 419       for(i=0;i<len;i++)
 420         ((uint32_t*)out)[i]=((uint32_t)((uint8_t*)in)[i])<<24;
 421       break;
 422     }
 423     break;
 424   case(2):
 425     switch(outbps){
 426     case(1):
 427       for(i=0;i<len;i++)
 428         ((uint8_t*)out)[i]=(uint8_t)((((uint16_t*)in)[i])>>8);
 429       break;
 430     case(3):
 431       for(i=0;i<len;i++)
 432         store24bit(out, i, ((uint32_t)((uint16_t*)in)[i])<<16);
 433       break;
 434     case(4):
 435       for(i=0;i<len;i++)
 436         ((uint32_t*)out)[i]=((uint32_t)((uint16_t*)in)[i])<<16;
 437       break;
 438     }
 439     break;
 440   case(3):
 441     switch(outbps){
 442     case(1):
 443       for(i=0;i<len;i++)
 444         ((uint8_t*)out)[i]=(uint8_t)(load24bit(in, i)>>24);
 445       break;
 446     case(2):
 447       for(i=0;i<len;i++)
 448         ((uint16_t*)out)[i]=(uint16_t)(load24bit(in, i)>>16);
 449       break;
 450     case(4):
 451       for(i=0;i<len;i++)
 452         ((uint32_t*)out)[i]=(uint32_t)load24bit(in, i);
 453       break;
 454     }
 455     break;
 456   case(4):
 457     switch(outbps){
 458     case(1):
 459       for(i=0;i<len;i++)
 460         ((uint8_t*)out)[i]=(uint8_t)((((uint32_t*)in)[i])>>24);
 461       break;
 462     case(2):
 463       for(i=0;i<len;i++)
 464         ((uint16_t*)out)[i]=(uint16_t)((((uint32_t*)in)[i])>>16);
 465       break;
 466     case(3):
 467       for(i=0;i<len;i++)
 468         store24bit(out, i, ((uint32_t*)in)[i]);
 469       break;
 470     }
 471     break;
 472   }
 473 }
 474
 475 static void float2int(float* in, void* out, int len, int bps)
 476 {
 477   register int i;
 478   switch(bps){
 479   case(1):
 480     for(i=0;i<len;i++)
 481       ((int8_t*)out)[i] = lrintf(127.0 * in[i]);
 482     break;
 483   case(2):
 484     for(i=0;i<len;i++)
 485       ((int16_t*)out)[i] = lrintf(32767.0 * in[i]);
 486     break;
 487   case(3):
 488     for(i=0;i<len;i++)
 489       store24bit(out, i, lrintf(2147483647.0 * in[i]));
 490     break;
 491   case(4):
 492     for(i=0;i<len;i++)
 493       ((int32_t*)out)[i] = lrintf(2147483647.0 * in[i]);
 494     break;
 495   }
 496 }
 497
 498 static void int2float(void* in, float* out, int len, int bps)
 499 {
 500   register int i;
 501   switch(bps){
 502   case(1):
 503     for(i=0;i<len;i++)
 504       out[i]=(1.0/128.0)*((int8_t*)in)[i];
 505     break;
 506   case(2):
 507     for(i=0;i<len;i++)
 508       out[i]=(1.0/32768.0)*((int16_t*)in)[i];
 509     break;
 510   case(3):
 511     for(i=0;i<len;i++)
 512       out[i]=(1.0/2147483648.0)*((int32_t)load24bit(in, i));
 513     break;
 514   case(4):
 515     for(i=0;i<len;i++)
 516       out[i]=(1.0/2147483648.0)*((int32_t*)in)[i];
 517     break;
 518   }
 519 }