libmpcodecs/ad_hwac3.c

   1 /*
   2  * DTS code based on "ac3/decode_dts.c" and "ac3/conversion.c" from "ogle 0.9"
   3  * (see http://www.dtek.chalmers.se/~dvd/)
   4  * Reference: DOCS/tech/hwac3.txt !!!!!
   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 #define _XOPEN_SOURCE 600
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28
  29 #include "config.h"
  30 #include "mp_msg.h"
  31 #include "mpbswap.h"
  32 #include "libavutil/common.h"
  33 #include "ffmpeg_files/intreadwrite.h"
  34
  35 #include "ad_internal.h"
  36
  37
  38 static int isdts = -1;
  39
  40 static const ad_info_t info =
  41 {
  42   "AC3/DTS pass-through S/PDIF",
  43   "hwac3",
  44   "Nick Kurshev/Peter Schüller",
  45   "???",
  46   ""
  47 };
  48
  49 LIBAD_EXTERN(hwac3)
  50
  51
  52 static int dts_syncinfo(uint8_t *indata_ptr, int *flags, int *sample_rate, int *bit_rate);
  53 static int decode_audio_dts(unsigned char *indata_ptr, int len, unsigned char *buf);
  54
  55
  56 static int a52_syncinfo (uint8_t *buf, int *sample_rate, int *bit_rate)
  57 {
  58     static const uint16_t rate[] = { 32,  40,  48,  56,  64,  80,  96, 112,
  59                                     128, 160, 192, 224, 256, 320, 384, 448,
  60                                     512, 576, 640};
  61     int frmsizecod;
  62     int bitrate;
  63     int half;
  64
  65     if (buf[0] != 0x0b || buf[1] != 0x77)    /* syncword */
  66         return 0;
  67
  68     if (buf[5] >= 0x60)                      /* bsid >= 12 */
  69         return 0;
  70     half = buf[5] >> 3;
  71     half = FFMAX(half - 8, 0);
  72
  73     frmsizecod = buf[4] & 63;
  74     if (frmsizecod >= 38)
  75         return 0;
  76     bitrate = rate[frmsizecod >> 1];
  77     *bit_rate = (bitrate * 1000) >> half;
  78
  79     switch (buf[4] & 0xc0) {
  80     case 0:
  81         *sample_rate = 48000 >> half;
  82         return 4 * bitrate;
  83     case 0x40:
  84         *sample_rate = 44100 >> half;
  85         return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
  86     case 0x80:
  87         *sample_rate = 32000 >> half;
  88         return 6 * bitrate;
  89     default:
  90         return 0;
  91     }
  92 }
  93
  94 static int ac3dts_fillbuff(sh_audio_t *sh_audio)
  95 {
  96   int length = 0;
  97   int flags = 0;
  98   int sample_rate = 0;
  99   int bit_rate = 0;
 100
 101   sh_audio->a_in_buffer_len = 0;
 102   /* sync frame:*/
 103   while(1)
 104   {
 105     // Original code DTS has a 10 bytes header.
 106     // Now max 12 bytes for 14 bits DTS header.
 107     while(sh_audio->a_in_buffer_len < 12)
 108     {
 109       int c = demux_getc(sh_audio->ds);
 110       if(c<0)
 111         return -1; /* EOF*/
 112       sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++] = c;
 113     }
 114
 115     if (sh_audio->format == 0x2001)
 116     {
 117       length = dts_syncinfo(sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
 118       if(length >= 12)
 119       {
 120         if(isdts != 1)
 121         {
 122           mp_msg(MSGT_DECAUDIO, MSGL_STATUS, "hwac3: switched to DTS, %d bps, %d Hz\n", bit_rate, sample_rate);
 123           isdts = 1;
 124         }
 125         break;
 126       }
 127     }
 128     else
 129     {
 130       length = a52_syncinfo(sh_audio->a_in_buffer, &sample_rate, &bit_rate);
 131       if(length >= 7 && length <= 3840)
 132       {
 133         if(isdts != 0)
 134         {
 135           mp_msg(MSGT_DECAUDIO, MSGL_STATUS, "hwac3: switched to AC3, %d bps, %d Hz\n", bit_rate, sample_rate);
 136           isdts = 0;
 137         }
 138         break; /* we're done.*/
 139       }
 140     }
 141     /* bad file => resync*/
 142     memcpy(sh_audio->a_in_buffer, sh_audio->a_in_buffer + 1, 11);
 143     --sh_audio->a_in_buffer_len;
 144   }
 145   mp_msg(MSGT_DECAUDIO, MSGL_DBG2, "ac3dts: %s len=%d  flags=0x%X  %d Hz %d bit/s\n", isdts == 1 ? "DTS" : isdts == 0 ? "AC3" : "unknown", length, flags, sample_rate, bit_rate);
 146
 147   sh_audio->samplerate = sample_rate;
 148   sh_audio->i_bps = bit_rate / 8;
 149   demux_read_data(sh_audio->ds, sh_audio->a_in_buffer + 12, length - 12);
 150   sh_audio->a_in_buffer_len = length;
 151
 152   return length;
 153 }
 154
 155
 156 static int preinit(sh_audio_t *sh)
 157 {
 158   /* Dolby AC3 audio: */
 159   sh->audio_out_minsize = 128 * 32 * 2 * 2; // DTS seems to need more than AC3
 160   sh->audio_in_minsize = 8192;
 161   sh->channels = 2;
 162   sh->samplesize = 2;
 163   sh->sample_format = AF_FORMAT_AC3_BE;
 164   // HACK for DTS where useless swapping can't easily be removed
 165   if (sh->format == 0x2001)
 166     sh->sample_format = AF_FORMAT_AC3_NE;
 167   return 1;
 168 }
 169
 170 static int init(sh_audio_t *sh_audio)
 171 {
 172   /* Dolby AC3 passthrough:*/
 173   if(ac3dts_fillbuff(sh_audio) < 0)
 174   {
 175     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "AC3/DTS sync failed\n");
 176     return 0;
 177   }
 178   return 1;
 179 }
 180
 181 static void uninit(sh_audio_t *sh)
 182 {
 183 }
 184
 185 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 186 {
 187   switch(cmd)
 188   {
 189   case ADCTRL_RESYNC_STREAM:
 190   case ADCTRL_SKIP_FRAME:
 191       ac3dts_fillbuff(sh);
 192       return CONTROL_TRUE;
 193   }
 194   return CONTROL_UNKNOWN;
 195 }
 196
 197
 198 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 199 {
 200   int len = sh_audio->a_in_buffer_len;
 201
 202   if(len <= 0)
 203     if((len = ac3dts_fillbuff(sh_audio)) <= 0)
 204       return len; /*EOF*/
 205   sh_audio->a_in_buffer_len = 0;
 206
 207   if(isdts == 1)
 208   {
 209     return decode_audio_dts(sh_audio->a_in_buffer, len, buf);
 210   }
 211   else if(isdts == 0)
 212   {
 213     AV_WB16(buf,     0xF872);   // iec 61937 syncword 1
 214     AV_WB16(buf + 2, 0x4E1F);   // iec 61937 syncword 2
 215     buf[4] = sh_audio->a_in_buffer[5] & 0x7; // bsmod
 216     buf[5] = 0x01;              // data-type ac3
 217     AV_WB16(buf + 6, len << 3); // number of bits in payload
 218     memcpy(buf + 8, sh_audio->a_in_buffer, len);
 219     memset(buf + 8 + len, 0, 6144 - 8 - len);
 220
 221     return 6144;
 222   }
 223   else
 224     return -1;
 225 }
 226
 227
 228 static const int DTS_SAMPLEFREQS[16] =
 229 {
 230   0,
 231   8000,
 232   16000,
 233   32000,
 234   64000,
 235   128000,
 236   11025,
 237   22050,
 238   44100,
 239   88200,
 240   176400,
 241   12000,
 242   24000,
 243   48000,
 244   96000,
 245   192000
 246 };
 247
 248 static const int DTS_BITRATES[30] =
 249 {
 250   32000,
 251   56000,
 252   64000,
 253   96000,
 254   112000,
 255   128000,
 256   192000,
 257   224000,
 258   256000,
 259   320000,
 260   384000,
 261   448000,
 262   512000,
 263   576000,
 264   640000,
 265   768000,
 266   896000,
 267   1024000,
 268   1152000,
 269   1280000,
 270   1344000,
 271   1408000,
 272   1411200,
 273   1472000,
 274   1536000,
 275   1920000,
 276   2048000,
 277   3072000,
 278   3840000,
 279   4096000
 280 };
 281
 282 static int dts_decode_header(uint8_t *indata_ptr, int *rate, int *nblks, int *sfreq)
 283 {
 284   int ftype;
 285   int surp;
 286   int unknown_bit av_unused;
 287   int fsize;
 288   int amode av_unused;
 289
 290   int word_mode;
 291   int le_mode;
 292
 293   unsigned int first4bytes = indata_ptr[0] << 24 | indata_ptr[1] << 16
 294                              | indata_ptr[2] << 8 | indata_ptr[3];
 295
 296   switch(first4bytes)
 297   {
 298     /* 14 bits LE */
 299     case 0xff1f00e8:
 300       /* Also make sure frame type is 1. */
 301       if ((indata_ptr[4]&0xf0) != 0xf0 || indata_ptr[5] != 0x07)
 302         return -1;
 303       word_mode = 0;
 304       le_mode = 1;
 305       break;
 306     /* 14 bits BE */
 307     case 0x1fffe800:
 308       /* Also make sure frame type is 1. */
 309       if (indata_ptr[4] != 0x07 || (indata_ptr[5]&0xf0) != 0xf0)
 310         return -1;
 311       word_mode = 0;
 312       le_mode = 0;
 313       break;
 314     /* 16 bits LE */
 315     case 0xfe7f0180:
 316       word_mode = 1;
 317       le_mode = 1;
 318       break;
 319     /* 16 bits BE */
 320     case 0x7ffe8001:
 321       word_mode = 1;
 322       le_mode = 0;
 323       break;
 324     default:
 325       return -1;
 326   }
 327
 328   if(word_mode)
 329   {
 330     /* First bit after first 32 bits:
 331        Frame type ( 1: Normal frame; 0: Termination frame ) */
 332     ftype = indata_ptr[4+le_mode] >> 7;
 333
 334   if(ftype != 1)
 335   {
 336     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: Termination frames not handled, REPORT BUG\n");
 337     return -1;
 338   }
 339     /* Next 5 bits: Surplus Sample Count V SURP 5 bits */
 340     surp = indata_ptr[4+le_mode] >> 2 & 0x1f;
 341     /* Number of surplus samples */
 342     surp = (surp + 1) % 32;
 343
 344     /* One unknown bit, crc? */
 345     unknown_bit = indata_ptr[4+le_mode] >> 1 & 0x01;
 346
 347     /* NBLKS 7 bits: Valid Range=5-127, Invalid Range=0-4 */
 348     *nblks = (indata_ptr[4+le_mode] & 0x01) << 6 | indata_ptr[5-le_mode] >> 2;
 349     /* NBLKS+1 indicates the number of 32 sample PCM audio blocks per channel
 350        encoded in the current frame per channel. */
 351     ++(*nblks);
 352
 353     /* Frame Byte Size V FSIZE 14 bits: 0-94=Invalid, 95-8191=Valid range-1
 354        (ie. 96 bytes to 8192 bytes), 8192-16383=Invalid
 355        FSIZE defines the byte size of the current audio frame. */
 356     fsize = (indata_ptr[5-le_mode] & 0x03) << 12 | indata_ptr[6+le_mode] << 4
 357             | indata_ptr[7-le_mode] >> 4;
 358     ++fsize;
 359
 360     /* Audio Channel Arrangement ACC AMODE 6 bits */
 361     amode = (indata_ptr[7-le_mode] & 0x0f) << 2 | indata_ptr[8+le_mode] >> 6;
 362
 363     /* Source Sampling rate ACC SFREQ 4 bits */
 364     *sfreq = indata_ptr[8+le_mode] >> 2 & 0x0f;
 365     /* Transmission Bit Rate ACC RATE 5 bits */
 366     *rate = (indata_ptr[8+le_mode] & 0x03) << 3
 367             | (indata_ptr[9-le_mode] >> 5 & 0x07);
 368   }
 369   else
 370   {
 371     /* in the case judgement, we assure this */
 372     ftype = 1;
 373     surp = 0;
 374     /* 14 bits support, every 2 bytes, & 0x3fff, got used 14 bits */
 375     /* Bits usage:
 376        32 bits: Sync code (28 + 4)      1th and 2th word, 4 bits in 3th word
 377        1  bits: Frame type              1 bits in 3th word
 378        5  bits: SURP                    5 bits in 3th word
 379        1  bits: crc?                    1 bits in 3th word
 380        7  bits: NBLKS                   3 bits in 3th word, 4 bits in 4th word
 381        14 bits: FSIZE                   10 bits in 4th word, 4 bits in 5th word
 382                                         in 14 bits mode, FSIZE = FSIZE*8/14*2
 383        6  bits: AMODE                   6 bits in 5th word
 384        4  bits: SFREQ                   4 bits in 5th word
 385        5  bits: RATE                    5 bits in 6th word
 386        total bits: 75 bits    */
 387
 388     /* NBLKS 7 bits: Valid Range=5-127, Invalid Range=0-4 */
 389     *nblks = (indata_ptr[5-le_mode] & 0x07) << 4
 390              | (indata_ptr[6+le_mode] & 0x3f) >> 2;
 391     /* NBLKS+1 indicates the number of 32 sample PCM audio blocks per channel
 392        encoded in the current frame per channel. */
 393     ++(*nblks);
 394
 395     /* Frame Byte Size V FSIZE 14 bits: 0-94=Invalid, 95-8191=Valid range-1
 396        (ie. 96 bytes to 8192 bytes), 8192-16383=Invalid
 397        FSIZE defines the byte size of the current audio frame. */
 398     fsize = (indata_ptr[6+le_mode] & 0x03) << 12 | indata_ptr[7-le_mode] << 4
 399             | (indata_ptr[8+le_mode] & 0x3f) >> 2;
 400     ++fsize;
 401     fsize = fsize * 8 / 14 * 2;
 402
 403     /* Audio Channel Arrangement ACC AMODE 6 bits */
 404     amode = (indata_ptr[8+le_mode] & 0x03) << 4
 405             | (indata_ptr[9-le_mode] & 0xf0) >> 4;
 406
 407     /* Source Sampling rate ACC SFREQ 4 bits */
 408     *sfreq = indata_ptr[9-le_mode] & 0x0f;
 409     /* Transmission Bit Rate ACC RATE 5 bits */
 410     *rate = (indata_ptr[10+le_mode] & 0x3f) >> 1;
 411   }
 412 #if 0
 413   if(*sfreq != 13)
 414   {
 415     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: Only 48kHz supported, REPORT BUG\n");
 416     return -1;
 417   }
 418 #endif
 419   if((fsize > 8192) || (fsize < 96))
 420   {
 421     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: fsize: %d invalid, REPORT BUG\n", fsize);
 422     return -1;
 423   }
 424
 425   if(*nblks != 8 &&
 426     *nblks != 16 &&
 427     *nblks != 32 &&
 428     *nblks != 64 &&
 429     *nblks != 128 &&
 430     ftype == 1)
 431   {
 432     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: nblks %d not valid for normal frame, REPORT BUG\n", *nblks);
 433     return -1;
 434   }
 435
 436   return fsize;
 437 }
 438
 439 static int dts_syncinfo(uint8_t *indata_ptr, int *flags, int *sample_rate, int *bit_rate)
 440 {
 441   int nblks;
 442   int fsize;
 443   int rate;
 444   int sfreq;
 445
 446   fsize = dts_decode_header(indata_ptr, &rate, &nblks, &sfreq);
 447   if(fsize >= 0)
 448   {
 449     if(rate >= 0 && rate <= 29)
 450       *bit_rate = DTS_BITRATES[rate];
 451     else
 452       *bit_rate = 0;
 453     if(sfreq >= 1 && sfreq <= 15)
 454       *sample_rate = DTS_SAMPLEFREQS[sfreq];
 455     else
 456       *sample_rate = 0;
 457   }
 458   return fsize;
 459 }
 460
 461 static int convert_14bits_to_16bits(const unsigned char *src,
 462                                     unsigned char *dest,
 463                                     int len,
 464                                     int is_le)
 465 {
 466   uint16_t *p = (uint16_t *)dest;
 467   uint16_t buf = 0;
 468   int spacebits = 16;
 469   if (len <= 0) return 0;
 470   while (len > 0) {
 471     uint16_t v;
 472     if (len == 1)
 473       v = is_le ? src[0] : src[0] << 8;
 474     else
 475       v = is_le ? src[1] << 8 | src[0] : src[0] << 8 | src[1];
 476     v <<= 2;
 477     src += 2;
 478     len -= 2;
 479     buf |= v >> (16 - spacebits);
 480     spacebits -= 14;
 481     if (spacebits < 0) {
 482       *p++ = buf;
 483       spacebits += 16;
 484       buf = v << (spacebits - 2);
 485     }
 486   }
 487   *p++ = buf;
 488   return (unsigned char *)p - dest;
 489 }
 490
 491 static int decode_audio_dts(unsigned char *indata_ptr, int len, unsigned char *buf)
 492 {
 493   int nblks;
 494   int fsize;
 495   int rate;
 496   int sfreq;
 497   int nr_samples;
 498   int convert_16bits = 0;
 499   uint16_t *buf16 = (uint16_t *)buf;
 500
 501   fsize = dts_decode_header(indata_ptr, &rate, &nblks, &sfreq);
 502   if(fsize < 0)
 503     return -1;
 504   nr_samples = nblks * 32;
 505
 506   buf16[0] = 0xf872; /* iec 61937     */
 507   buf16[1] = 0x4e1f; /*  syncword     */
 508   switch(nr_samples)
 509   {
 510   case 512:
 511     buf16[2] = 0x000b;      /* DTS-1 (512-sample bursts) */
 512     break;
 513   case 1024:
 514     buf16[2] = 0x000c;      /* DTS-2 (1024-sample bursts) */
 515     break;
 516   case 2048:
 517     buf16[2] = 0x000d;      /* DTS-3 (2048-sample bursts) */
 518     break;
 519   default:
 520     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: %d-sample bursts not supported\n", nr_samples);
 521     buf16[2] = 0x0000;
 522     break;
 523   }
 524
 525   if(fsize + 8 > nr_samples * 2 * 2)
 526   {
 527     // dts wav (14bits LE) match this condition, one way to passthrough
 528     // is not add iec 61937 header, decoders will notice the dts header
 529     // and identify the dts stream. Another way here is convert
 530     // the stream from 14 bits to 16 bits.
 531     if ((indata_ptr[0] == 0xff || indata_ptr[0] == 0x1f)
 532         && fsize * 14 / 16 + 8 <= nr_samples * 2 * 2) {
 533       // The input stream is 14 bits, we can shrink it to 16 bits
 534       // to save space for add the 61937 header
 535       fsize = convert_14bits_to_16bits(indata_ptr,
 536                                        &buf[8],
 537                                        fsize,
 538                                        indata_ptr[0] == 0xff /* is LE */
 539                                        );
 540       mp_msg(MSGT_DECAUDIO, MSGL_DBG3, "DTS: shrink 14 bits stream to "
 541              "16 bits %02x%02x%02x%02x => %02x%02x%02x%02x, new size %d.\n",
 542              indata_ptr[0], indata_ptr[1], indata_ptr[2], indata_ptr[3],
 543              buf[8], buf[9], buf[10], buf[11], fsize);
 544       convert_16bits = 1;
 545     }
 546     else
 547     mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: more data than fits\n");
 548   }
 549
 550   buf16[3] = fsize << 3;
 551
 552   if (!convert_16bits) {
 553 #if HAVE_BIGENDIAN
 554   /* BE stream */
 555   if (indata_ptr[0] == 0x1f || indata_ptr[0] == 0x7f)
 556 #else
 557   /* LE stream */
 558   if (indata_ptr[0] == 0xff || indata_ptr[0] == 0xfe)
 559 #endif
 560   memcpy(&buf[8], indata_ptr, fsize);
 561   else
 562   {
 563   swab(indata_ptr, &buf[8], fsize);
 564   if (fsize & 1) {
 565     buf[8+fsize-1] = 0;
 566     buf[8+fsize] = indata_ptr[fsize-1];
 567     fsize++;
 568   }
 569   }
 570   }
 571   memset(&buf[fsize + 8], 0, nr_samples * 2 * 2 - (fsize + 8));
 572
 573   return nr_samples * 2 * 2;
 574 }