libavcodec/tta.c

   1 /*
   2  * TTA (The Lossless True Audio) decoder
   3  * Copyright (c) 2006 Alex Beregszaszi
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 /**
  21  * @file tta.c
  22  * TTA (The Lossless True Audio) decoder
  23  * (www.true-audio.com or tta.corecodec.org)
  24  * @author Alex Beregszaszi
  25  *
  26  */
  27
  28 #define ALT_BITSTREAM_READER_LE
  29 //#define DEBUG
  30 #include <limits.h>
  31 #include "avcodec.h"
  32 #include "bitstream.h"
  33
  34 #define FORMAT_INT 1
  35 #define FORMAT_FLOAT 3
  36
  37 typedef struct TTAContext {
  38     AVCodecContext *avctx;
  39     GetBitContext gb;
  40
  41     int flags, channels, bps, is_float, data_length;
  42     int frame_length, last_frame_length, total_frames;
  43
  44     int32_t *decode_buffer;
  45 } TTAContext;
  46
  47 #if 0
  48 static inline int shift_1(int i)
  49 {
  50     if (i < 32)
  51         return 1 << i;
  52     else
  53         return 0x80000000; // 16 << 31
  54 }
  55
  56 static inline int shift_16(int i)
  57 {
  58     if (i < 28)
  59         return 16 << i;
  60     else
  61         return 0x80000000; // 16 << 27
  62 }
  63 #else
  64 static const uint32_t shift_1[] = {
  65     0x00000001, 0x00000002, 0x00000004, 0x00000008,
  66     0x00000010, 0x00000020, 0x00000040, 0x00000080,
  67     0x00000100, 0x00000200, 0x00000400, 0x00000800,
  68     0x00001000, 0x00002000, 0x00004000, 0x00008000,
  69     0x00010000, 0x00020000, 0x00040000, 0x00080000,
  70     0x00100000, 0x00200000, 0x00400000, 0x00800000,
  71     0x01000000, 0x02000000, 0x04000000, 0x08000000,
  72     0x10000000, 0x20000000, 0x40000000, 0x80000000,
  73     0x80000000, 0x80000000, 0x80000000, 0x80000000,
  74     0x80000000, 0x80000000, 0x80000000, 0x80000000
  75 };
  76
  77 static const uint32_t *shift_16 = shift_1 + 4;
  78 #endif
  79
  80 #define MAX_ORDER 16
  81 typedef struct TTAFilter {
  82     int32_t shift, round, error, mode;
  83     int32_t qm[MAX_ORDER];
  84     int32_t dx[MAX_ORDER];
  85     int32_t dl[MAX_ORDER];
  86 } TTAFilter;
  87
  88 static int32_t ttafilter_configs[4][2] = {
  89     {10, 1},
  90     {9, 1},
  91     {10, 1},
  92     {12, 0}
  93 };
  94
  95 static void ttafilter_init(TTAFilter *c, int32_t shift, int32_t mode) {
  96     memset(c, 0, sizeof(TTAFilter));
  97     c->shift = shift;
  98    c->round = shift_1[shift-1];
  99 //    c->round = 1 << (shift - 1);
 100     c->mode = mode;
 101 }
 102
 103 // FIXME: copy paste from original
 104 static inline void memshl(register int32_t *a, register int32_t *b) {
 105     *a++ = *b++;
 106     *a++ = *b++;
 107     *a++ = *b++;
 108     *a++ = *b++;
 109     *a++ = *b++;
 110     *a++ = *b++;
 111     *a++ = *b++;
 112     *a = *b;
 113 }
 114
 115 // FIXME: copy paste from original
 116 // mode=1 encoder, mode=0 decoder
 117 static inline void ttafilter_process(TTAFilter *c, int32_t *in, int32_t mode) {
 118     register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
 119
 120     if (!c->error) {
 121         sum += *dl++ * *qm, qm++;
 122         sum += *dl++ * *qm, qm++;
 123         sum += *dl++ * *qm, qm++;
 124         sum += *dl++ * *qm, qm++;
 125         sum += *dl++ * *qm, qm++;
 126         sum += *dl++ * *qm, qm++;
 127         sum += *dl++ * *qm, qm++;
 128         sum += *dl++ * *qm, qm++;
 129         dx += 8;
 130     } else if(c->error < 0) {
 131         sum += *dl++ * (*qm -= *dx++), qm++;
 132         sum += *dl++ * (*qm -= *dx++), qm++;
 133         sum += *dl++ * (*qm -= *dx++), qm++;
 134         sum += *dl++ * (*qm -= *dx++), qm++;
 135         sum += *dl++ * (*qm -= *dx++), qm++;
 136         sum += *dl++ * (*qm -= *dx++), qm++;
 137         sum += *dl++ * (*qm -= *dx++), qm++;
 138         sum += *dl++ * (*qm -= *dx++), qm++;
 139     } else {
 140         sum += *dl++ * (*qm += *dx++), qm++;
 141         sum += *dl++ * (*qm += *dx++), qm++;
 142         sum += *dl++ * (*qm += *dx++), qm++;
 143         sum += *dl++ * (*qm += *dx++), qm++;
 144         sum += *dl++ * (*qm += *dx++), qm++;
 145         sum += *dl++ * (*qm += *dx++), qm++;
 146         sum += *dl++ * (*qm += *dx++), qm++;
 147         sum += *dl++ * (*qm += *dx++), qm++;
 148     }
 149
 150     *(dx-0) = ((*(dl-1) >> 30) | 1) << 2;
 151     *(dx-1) = ((*(dl-2) >> 30) | 1) << 1;
 152     *(dx-2) = ((*(dl-3) >> 30) | 1) << 1;
 153     *(dx-3) = ((*(dl-4) >> 30) | 1);
 154
 155     // compress
 156     if (mode) {
 157         *dl = *in;
 158         *in -= (sum >> c->shift);
 159         c->error = *in;
 160     } else {
 161         c->error = *in;
 162         *in += (sum >> c->shift);
 163         *dl = *in;
 164     }
 165
 166     if (c->mode) {
 167         *(dl-1) = *dl - *(dl-1);
 168         *(dl-2) = *(dl-1) - *(dl-2);
 169         *(dl-3) = *(dl-2) - *(dl-3);
 170     }
 171
 172     memshl(c->dl, c->dl + 1);
 173     memshl(c->dx, c->dx + 1);
 174 }
 175
 176 typedef struct TTARice {
 177     uint32_t k0, k1, sum0, sum1;
 178 } TTARice;
 179
 180 static void rice_init(TTARice *c, uint32_t k0, uint32_t k1)
 181 {
 182     c->k0 = k0;
 183     c->k1 = k1;
 184     c->sum0 = shift_16[k0];
 185     c->sum1 = shift_16[k1];
 186 }
 187
 188 static int tta_get_unary(GetBitContext *gb)
 189 {
 190     int ret = 0;
 191
 192     // count ones
 193     while(get_bits1(gb))
 194         ret++;
 195     return ret;
 196 }
 197
 198 // shamelessly copied from shorten.c
 199 static int inline get_le16(GetBitContext *gb)
 200 {
 201     return bswap_16(get_bits_long(gb, 16));
 202 }
 203
 204 static int inline get_le32(GetBitContext *gb)
 205 {
 206     return bswap_32(get_bits_long(gb, 32));
 207 }
 208
 209 static int tta_decode_init(AVCodecContext * avctx)
 210 {
 211     TTAContext *s = avctx->priv_data;
 212     int i;
 213
 214     s->avctx = avctx;
 215
 216     // 30bytes includes a seektable with one frame
 217     if (avctx->extradata_size < 30)
 218         return -1;
 219
 220     init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size);
 221     if (show_bits_long(&s->gb, 32) == bswap_32(ff_get_fourcc("TTA1")))
 222     {
 223         /* signature */
 224         skip_bits(&s->gb, 32);
 225 //        if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("TTA1"))) {
 226 //            av_log(s->avctx, AV_LOG_ERROR, "Missing magic\n");
 227 //            return -1;
 228 //        }
 229
 230         s->flags = get_le16(&s->gb);
 231         if (s->flags != 1 && s->flags != 3)
 232         {
 233             av_log(s->avctx, AV_LOG_ERROR, "Invalid flags\n");
 234             return -1;
 235         }
 236         s->is_float = (s->flags == FORMAT_FLOAT);
 237         avctx->channels = s->channels = get_le16(&s->gb);
 238         avctx->bits_per_sample = get_le16(&s->gb);
 239         s->bps = (avctx->bits_per_sample + 7) / 8;
 240         avctx->sample_rate = get_le32(&s->gb);
 241         if(avctx->sample_rate > 1000000){ //prevent FRAME_TIME * avctx->sample_rate from overflowing and sanity check
 242             av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
 243             return -1;
 244         }
 245         s->data_length = get_le32(&s->gb);
 246         skip_bits(&s->gb, 32); // CRC32 of header
 247
 248         if (s->is_float)
 249         {
 250             avctx->sample_fmt = SAMPLE_FMT_FLT;
 251             av_log(s->avctx, AV_LOG_ERROR, "Unsupported sample format. Please contact the developers.\n");
 252             return -1;
 253         }
 254         else switch(s->bps) {
 255 //            case 1: avctx->sample_fmt = SAMPLE_FMT_U8; break;
 256             case 2: avctx->sample_fmt = SAMPLE_FMT_S16; break;
 257 //            case 3: avctx->sample_fmt = SAMPLE_FMT_S24; break;
 258             case 4: avctx->sample_fmt = SAMPLE_FMT_S32; break;
 259             default:
 260                 av_log(s->avctx, AV_LOG_ERROR, "Invalid/unsupported sample format. Please contact the developers.\n");
 261                 return -1;
 262         }
 263
 264         // FIXME: horribly broken, but directly from reference source
 265 #define FRAME_TIME 1.04489795918367346939
 266         s->frame_length = (int)(FRAME_TIME * avctx->sample_rate);
 267
 268         s->last_frame_length = s->data_length % s->frame_length;
 269         s->total_frames = s->data_length / s->frame_length +
 270                         (s->last_frame_length ? 1 : 0);
 271
 272         av_log(s->avctx, AV_LOG_DEBUG, "flags: %x chans: %d bps: %d rate: %d block: %d\n",
 273             s->flags, avctx->channels, avctx->bits_per_sample, avctx->sample_rate,
 274             avctx->block_align);
 275         av_log(s->avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
 276             s->data_length, s->frame_length, s->last_frame_length, s->total_frames);
 277
 278         // FIXME: seek table
 279         for (i = 0; i < s->total_frames; i++)
 280             skip_bits(&s->gb, 32);
 281         skip_bits(&s->gb, 32); // CRC32 of seektable
 282
 283         if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
 284             av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
 285             return -1;
 286         }
 287
 288         s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
 289     } else {
 290         av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
 291         return -1;
 292     }
 293
 294     return 0;
 295 }
 296
 297 static int tta_decode_frame(AVCodecContext *avctx,
 298         void *data, int *data_size,
 299         uint8_t *buf, int buf_size)
 300 {
 301     TTAContext *s = avctx->priv_data;
 302     int i;
 303
 304     init_get_bits(&s->gb, buf, buf_size*8);
 305     {
 306         int32_t predictors[s->channels];
 307         TTAFilter filters[s->channels];
 308         TTARice rices[s->channels];
 309         int cur_chan = 0, framelen = s->frame_length;
 310         int32_t *p;
 311
 312         // FIXME: seeking
 313         s->total_frames--;
 314         if (!s->total_frames && s->last_frame_length)
 315             framelen = s->last_frame_length;
 316
 317         // init per channel states
 318         for (i = 0; i < s->channels; i++) {
 319             predictors[i] = 0;
 320             ttafilter_init(&(filters[i]), ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]);
 321             rice_init(&(rices[i]), 10, 10);
 322         }
 323
 324         for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
 325             int32_t *predictor = &(predictors[cur_chan]);
 326             TTAFilter *filter = &(filters[cur_chan]);
 327             TTARice *rice = &(rices[cur_chan]);
 328             uint32_t unary, depth, k;
 329             int32_t value;
 330
 331             unary = tta_get_unary(&s->gb);
 332
 333             if (unary == 0) {
 334                 depth = 0;
 335                 k = rice->k0;
 336             } else {
 337                 depth = 1;
 338                 k = rice->k1;
 339                 unary--;
 340             }
 341
 342             if (k)
 343                 value = (unary << k) + get_bits(&s->gb, k);
 344             else
 345                 value = unary;
 346
 347             // FIXME: copy paste from original
 348             switch (depth) {
 349             case 1:
 350                 rice->sum1 += value - (rice->sum1 >> 4);
 351                 if (rice->k1 > 0 && rice->sum1 < shift_16[rice->k1])
 352                     rice->k1--;
 353                 else if(rice->sum1 > shift_16[rice->k1 + 1])
 354                     rice->k1++;
 355                 value += shift_1[rice->k0];
 356             default:
 357                 rice->sum0 += value - (rice->sum0 >> 4);
 358                 if (rice->k0 > 0 && rice->sum0 < shift_16[rice->k0])
 359                     rice->k0--;
 360                 else if(rice->sum0 > shift_16[rice->k0 + 1])
 361                     rice->k0++;
 362             }
 363
 364             // extract sign
 365 #define SIGN(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
 366             *p = SIGN(value);
 367
 368             // run hybrid filter
 369             ttafilter_process(filter, p, 0);
 370
 371             // fixed order prediction
 372 #define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
 373             switch (s->bps) {
 374                 case 1: *p += PRED(*predictor, 4); break;
 375                 case 2:
 376                 case 3: *p += PRED(*predictor, 5); break;
 377                 case 4: *p += *predictor; break;
 378             }
 379             *predictor = *p;
 380
 381 #if 0
 382             // extract 32bit float from last two int samples
 383             if (s->is_float && ((p - data) & 1)) {
 384                 uint32_t neg = *p & 0x80000000;
 385                 uint32_t hi = *(p - 1);
 386                 uint32_t lo = abs(*p) - 1;
 387
 388                 hi += (hi || lo) ? 0x3f80 : 0;
 389                 // SWAP16: swap all the 16 bits
 390                 *(p - 1) = (hi << 16) | SWAP16(lo) | neg;
 391             }
 392 #endif
 393
 394             /*if ((get_bits_count(&s->gb)+7)/8 > buf_size)
 395             {
 396                 av_log(NULL, AV_LOG_INFO, "overread!!\n");
 397                 break;
 398             }*/
 399
 400             // flip channels
 401             if (cur_chan < (s->channels-1))
 402                 cur_chan++;
 403             else {
 404                 // decorrelate in case of stereo integer
 405                 if (!s->is_float && (s->channels > 1)) {
 406                     int32_t *r = p - 1;
 407                     for (*p += *r / 2; r > p - s->channels; r--)
 408                         *r = *(r + 1) - *r;
 409                 }
 410                 cur_chan = 0;
 411             }
 412         }
 413
 414         skip_bits(&s->gb, 32); // frame crc
 415
 416         // convert to output buffer
 417         switch(s->bps) {
 418             case 2: {
 419                 uint16_t *samples = data;
 420                 for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
 421 //                    *samples++ = (unsigned char)*p;
 422 //                    *samples++ = (unsigned char)(*p >> 8);
 423                     *samples++ = *p;
 424                 }
 425                 *data_size = (uint8_t *)samples - (uint8_t *)data;
 426                 break;
 427             }
 428             default:
 429                 av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
 430         }
 431     }
 432
 433 //    return get_bits_count(&s->gb)+7)/8;
 434     return buf_size;
 435 }
 436
 437 static int tta_decode_close(AVCodecContext *avctx) {
 438     TTAContext *s = avctx->priv_data;
 439
 440     if (s->decode_buffer)
 441         av_free(s->decode_buffer);
 442
 443     return 0;
 444 }
 445
 446 AVCodec tta_decoder = {
 447     "tta",
 448     CODEC_TYPE_AUDIO,
 449     CODEC_ID_TTA,
 450     sizeof(TTAContext),
 451     tta_decode_init,
 452     NULL,
 453     tta_decode_close,
 454     tta_decode_frame,
 455 };