| 1 | /* |
| 2 | * Shorten decoder |
| 3 | * Copyright (c) 2005 Jeff Muizelaar |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Shorten decoder |
| 25 | * @author Jeff Muizelaar |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | #include <limits.h> |
| 30 | #include "avcodec.h" |
| 31 | #include "bytestream.h" |
| 32 | #include "get_bits.h" |
| 33 | #include "golomb.h" |
| 34 | #include "internal.h" |
| 35 | |
| 36 | #define MAX_CHANNELS 8 |
| 37 | #define MAX_BLOCKSIZE 65535 |
| 38 | |
| 39 | #define OUT_BUFFER_SIZE 16384 |
| 40 | |
| 41 | #define ULONGSIZE 2 |
| 42 | |
| 43 | #define WAVE_FORMAT_PCM 0x0001 |
| 44 | |
| 45 | #define DEFAULT_BLOCK_SIZE 256 |
| 46 | |
| 47 | #define TYPESIZE 4 |
| 48 | #define CHANSIZE 0 |
| 49 | #define LPCQSIZE 2 |
| 50 | #define ENERGYSIZE 3 |
| 51 | #define BITSHIFTSIZE 2 |
| 52 | |
| 53 | #define TYPE_S8 1 |
| 54 | #define TYPE_U8 2 |
| 55 | #define TYPE_S16HL 3 |
| 56 | #define TYPE_U16HL 4 |
| 57 | #define TYPE_S16LH 5 |
| 58 | #define TYPE_U16LH 6 |
| 59 | |
| 60 | #define NWRAP 3 |
| 61 | #define NSKIPSIZE 1 |
| 62 | |
| 63 | #define LPCQUANT 5 |
| 64 | #define V2LPCQOFFSET (1 << LPCQUANT) |
| 65 | |
| 66 | #define FNSIZE 2 |
| 67 | #define FN_DIFF0 0 |
| 68 | #define FN_DIFF1 1 |
| 69 | #define FN_DIFF2 2 |
| 70 | #define FN_DIFF3 3 |
| 71 | #define FN_QUIT 4 |
| 72 | #define FN_BLOCKSIZE 5 |
| 73 | #define FN_BITSHIFT 6 |
| 74 | #define FN_QLPC 7 |
| 75 | #define FN_ZERO 8 |
| 76 | #define FN_VERBATIM 9 |
| 77 | |
| 78 | /** indicates if the FN_* command is audio or non-audio */ |
| 79 | static const uint8_t is_audio_command[10] = { 1, 1, 1, 1, 0, 0, 0, 1, 1, 0 }; |
| 80 | |
| 81 | #define VERBATIM_CKSIZE_SIZE 5 |
| 82 | #define VERBATIM_BYTE_SIZE 8 |
| 83 | #define CANONICAL_HEADER_SIZE 44 |
| 84 | |
| 85 | typedef struct ShortenContext { |
| 86 | AVCodecContext *avctx; |
| 87 | GetBitContext gb; |
| 88 | |
| 89 | int min_framesize, max_framesize; |
| 90 | unsigned channels; |
| 91 | |
| 92 | int32_t *decoded[MAX_CHANNELS]; |
| 93 | int32_t *decoded_base[MAX_CHANNELS]; |
| 94 | int32_t *offset[MAX_CHANNELS]; |
| 95 | int *coeffs; |
| 96 | uint8_t *bitstream; |
| 97 | int bitstream_size; |
| 98 | int bitstream_index; |
| 99 | unsigned int allocated_bitstream_size; |
| 100 | int header_size; |
| 101 | uint8_t header[OUT_BUFFER_SIZE]; |
| 102 | int version; |
| 103 | int cur_chan; |
| 104 | int bitshift; |
| 105 | int nmean; |
| 106 | int internal_ftype; |
| 107 | int nwrap; |
| 108 | int blocksize; |
| 109 | int bitindex; |
| 110 | int32_t lpcqoffset; |
| 111 | int got_header; |
| 112 | int got_quit_command; |
| 113 | } ShortenContext; |
| 114 | |
| 115 | static av_cold int shorten_decode_init(AVCodecContext *avctx) |
| 116 | { |
| 117 | ShortenContext *s = avctx->priv_data; |
| 118 | s->avctx = avctx; |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static int allocate_buffers(ShortenContext *s) |
| 124 | { |
| 125 | int i, chan, err; |
| 126 | |
| 127 | for (chan = 0; chan < s->channels; chan++) { |
| 128 | if (FFMAX(1, s->nmean) >= UINT_MAX / sizeof(int32_t)) { |
| 129 | av_log(s->avctx, AV_LOG_ERROR, "nmean too large\n"); |
| 130 | return AVERROR_INVALIDDATA; |
| 131 | } |
| 132 | if (s->blocksize + s->nwrap >= UINT_MAX / sizeof(int32_t) || |
| 133 | s->blocksize + s->nwrap <= (unsigned)s->nwrap) { |
| 134 | av_log(s->avctx, AV_LOG_ERROR, |
| 135 | "s->blocksize + s->nwrap too large\n"); |
| 136 | return AVERROR_INVALIDDATA; |
| 137 | } |
| 138 | |
| 139 | if ((err = av_reallocp(&s->offset[chan], |
| 140 | sizeof(int32_t) * |
| 141 | FFMAX(1, s->nmean))) < 0) |
| 142 | return err; |
| 143 | |
| 144 | if ((err = av_reallocp(&s->decoded_base[chan], (s->blocksize + s->nwrap) * |
| 145 | sizeof(s->decoded_base[0][0]))) < 0) |
| 146 | return err; |
| 147 | for (i = 0; i < s->nwrap; i++) |
| 148 | s->decoded_base[chan][i] = 0; |
| 149 | s->decoded[chan] = s->decoded_base[chan] + s->nwrap; |
| 150 | } |
| 151 | |
| 152 | if ((err = av_reallocp(&s->coeffs, s->nwrap * sizeof(*s->coeffs))) < 0) |
| 153 | return err; |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static inline unsigned int get_uint(ShortenContext *s, int k) |
| 159 | { |
| 160 | if (s->version != 0) |
| 161 | k = get_ur_golomb_shorten(&s->gb, ULONGSIZE); |
| 162 | return get_ur_golomb_shorten(&s->gb, k); |
| 163 | } |
| 164 | |
| 165 | static void fix_bitshift(ShortenContext *s, int32_t *buffer) |
| 166 | { |
| 167 | int i; |
| 168 | |
| 169 | if (s->bitshift != 0) |
| 170 | for (i = 0; i < s->blocksize; i++) |
| 171 | buffer[i] <<= s->bitshift; |
| 172 | } |
| 173 | |
| 174 | static int init_offset(ShortenContext *s) |
| 175 | { |
| 176 | int32_t mean = 0; |
| 177 | int chan, i; |
| 178 | int nblock = FFMAX(1, s->nmean); |
| 179 | /* initialise offset */ |
| 180 | switch (s->internal_ftype) { |
| 181 | case TYPE_U8: |
| 182 | s->avctx->sample_fmt = AV_SAMPLE_FMT_U8P; |
| 183 | mean = 0x80; |
| 184 | break; |
| 185 | case TYPE_S16HL: |
| 186 | case TYPE_S16LH: |
| 187 | s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
| 188 | break; |
| 189 | default: |
| 190 | av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n"); |
| 191 | return AVERROR_PATCHWELCOME; |
| 192 | } |
| 193 | |
| 194 | for (chan = 0; chan < s->channels; chan++) |
| 195 | for (i = 0; i < nblock; i++) |
| 196 | s->offset[chan][i] = mean; |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header, |
| 201 | int header_size) |
| 202 | { |
| 203 | int len, bps; |
| 204 | short wave_format; |
| 205 | GetByteContext gb; |
| 206 | |
| 207 | bytestream2_init(&gb, header, header_size); |
| 208 | |
| 209 | if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) { |
| 210 | av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n"); |
| 211 | return AVERROR_INVALIDDATA; |
| 212 | } |
| 213 | |
| 214 | bytestream2_skip(&gb, 4); /* chunk size */ |
| 215 | |
| 216 | if (bytestream2_get_le32(&gb) != MKTAG('W', 'A', 'V', 'E')) { |
| 217 | av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n"); |
| 218 | return AVERROR_INVALIDDATA; |
| 219 | } |
| 220 | |
| 221 | while (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', ' ')) { |
| 222 | len = bytestream2_get_le32(&gb); |
| 223 | bytestream2_skip(&gb, len); |
| 224 | if (len < 0 || bytestream2_get_bytes_left(&gb) < 16) { |
| 225 | av_log(avctx, AV_LOG_ERROR, "no fmt chunk found\n"); |
| 226 | return AVERROR_INVALIDDATA; |
| 227 | } |
| 228 | } |
| 229 | len = bytestream2_get_le32(&gb); |
| 230 | |
| 231 | if (len < 16) { |
| 232 | av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n"); |
| 233 | return AVERROR_INVALIDDATA; |
| 234 | } |
| 235 | |
| 236 | wave_format = bytestream2_get_le16(&gb); |
| 237 | |
| 238 | switch (wave_format) { |
| 239 | case WAVE_FORMAT_PCM: |
| 240 | break; |
| 241 | default: |
| 242 | av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n"); |
| 243 | return AVERROR(ENOSYS); |
| 244 | } |
| 245 | |
| 246 | bytestream2_skip(&gb, 2); // skip channels (already got from shorten header) |
| 247 | avctx->sample_rate = bytestream2_get_le32(&gb); |
| 248 | bytestream2_skip(&gb, 4); // skip bit rate (represents original uncompressed bit rate) |
| 249 | bytestream2_skip(&gb, 2); // skip block align (not needed) |
| 250 | bps = bytestream2_get_le16(&gb); |
| 251 | avctx->bits_per_coded_sample = bps; |
| 252 | |
| 253 | if (bps != 16 && bps != 8) { |
| 254 | av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps); |
| 255 | return AVERROR(ENOSYS); |
| 256 | } |
| 257 | |
| 258 | len -= 16; |
| 259 | if (len > 0) |
| 260 | av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len); |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static const int fixed_coeffs[][3] = { |
| 266 | { 0, 0, 0 }, |
| 267 | { 1, 0, 0 }, |
| 268 | { 2, -1, 0 }, |
| 269 | { 3, -3, 1 } |
| 270 | }; |
| 271 | |
| 272 | static int decode_subframe_lpc(ShortenContext *s, int command, int channel, |
| 273 | int residual_size, int32_t coffset) |
| 274 | { |
| 275 | int pred_order, sum, qshift, init_sum, i, j; |
| 276 | const int *coeffs; |
| 277 | |
| 278 | if (command == FN_QLPC) { |
| 279 | /* read/validate prediction order */ |
| 280 | pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE); |
| 281 | if (pred_order > s->nwrap) { |
| 282 | av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n", |
| 283 | pred_order); |
| 284 | return AVERROR(EINVAL); |
| 285 | } |
| 286 | /* read LPC coefficients */ |
| 287 | for (i = 0; i < pred_order; i++) |
| 288 | s->coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT); |
| 289 | coeffs = s->coeffs; |
| 290 | |
| 291 | qshift = LPCQUANT; |
| 292 | } else { |
| 293 | /* fixed LPC coeffs */ |
| 294 | pred_order = command; |
| 295 | if (pred_order >= FF_ARRAY_ELEMS(fixed_coeffs)) { |
| 296 | av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n", |
| 297 | pred_order); |
| 298 | return AVERROR_INVALIDDATA; |
| 299 | } |
| 300 | coeffs = fixed_coeffs[pred_order]; |
| 301 | qshift = 0; |
| 302 | } |
| 303 | |
| 304 | /* subtract offset from previous samples to use in prediction */ |
| 305 | if (command == FN_QLPC && coffset) |
| 306 | for (i = -pred_order; i < 0; i++) |
| 307 | s->decoded[channel][i] -= coffset; |
| 308 | |
| 309 | /* decode residual and do LPC prediction */ |
| 310 | init_sum = pred_order ? (command == FN_QLPC ? s->lpcqoffset : 0) : coffset; |
| 311 | for (i = 0; i < s->blocksize; i++) { |
| 312 | sum = init_sum; |
| 313 | for (j = 0; j < pred_order; j++) |
| 314 | sum += coeffs[j] * s->decoded[channel][i - j - 1]; |
| 315 | s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + |
| 316 | (sum >> qshift); |
| 317 | } |
| 318 | |
| 319 | /* add offset to current samples */ |
| 320 | if (command == FN_QLPC && coffset) |
| 321 | for (i = 0; i < s->blocksize; i++) |
| 322 | s->decoded[channel][i] += coffset; |
| 323 | |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | static int read_header(ShortenContext *s) |
| 328 | { |
| 329 | int i, ret; |
| 330 | int maxnlpc = 0; |
| 331 | /* shorten signature */ |
| 332 | if (get_bits_long(&s->gb, 32) != AV_RB32("ajkg")) { |
| 333 | av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n"); |
| 334 | return AVERROR_INVALIDDATA; |
| 335 | } |
| 336 | |
| 337 | s->lpcqoffset = 0; |
| 338 | s->blocksize = DEFAULT_BLOCK_SIZE; |
| 339 | s->nmean = -1; |
| 340 | s->version = get_bits(&s->gb, 8); |
| 341 | s->internal_ftype = get_uint(s, TYPESIZE); |
| 342 | |
| 343 | s->channels = get_uint(s, CHANSIZE); |
| 344 | if (!s->channels) { |
| 345 | av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n"); |
| 346 | return AVERROR_INVALIDDATA; |
| 347 | } |
| 348 | if (s->channels > MAX_CHANNELS) { |
| 349 | av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels); |
| 350 | s->channels = 0; |
| 351 | return AVERROR_INVALIDDATA; |
| 352 | } |
| 353 | s->avctx->channels = s->channels; |
| 354 | |
| 355 | /* get blocksize if version > 0 */ |
| 356 | if (s->version > 0) { |
| 357 | int skip_bytes; |
| 358 | unsigned blocksize; |
| 359 | |
| 360 | blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE)); |
| 361 | if (!blocksize || blocksize > MAX_BLOCKSIZE) { |
| 362 | av_log(s->avctx, AV_LOG_ERROR, |
| 363 | "invalid or unsupported block size: %d\n", |
| 364 | blocksize); |
| 365 | return AVERROR(EINVAL); |
| 366 | } |
| 367 | s->blocksize = blocksize; |
| 368 | |
| 369 | maxnlpc = get_uint(s, LPCQSIZE); |
| 370 | s->nmean = get_uint(s, 0); |
| 371 | |
| 372 | skip_bytes = get_uint(s, NSKIPSIZE); |
| 373 | for (i = 0; i < skip_bytes; i++) |
| 374 | skip_bits(&s->gb, 8); |
| 375 | } |
| 376 | s->nwrap = FFMAX(NWRAP, maxnlpc); |
| 377 | |
| 378 | if ((ret = allocate_buffers(s)) < 0) |
| 379 | return ret; |
| 380 | |
| 381 | if ((ret = init_offset(s)) < 0) |
| 382 | return ret; |
| 383 | |
| 384 | if (s->version > 1) |
| 385 | s->lpcqoffset = V2LPCQOFFSET; |
| 386 | |
| 387 | if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) { |
| 388 | av_log(s->avctx, AV_LOG_ERROR, |
| 389 | "missing verbatim section at beginning of stream\n"); |
| 390 | return AVERROR_INVALIDDATA; |
| 391 | } |
| 392 | |
| 393 | s->header_size = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE); |
| 394 | if (s->header_size >= OUT_BUFFER_SIZE || |
| 395 | s->header_size < CANONICAL_HEADER_SIZE) { |
| 396 | av_log(s->avctx, AV_LOG_ERROR, "header is wrong size: %d\n", |
| 397 | s->header_size); |
| 398 | return AVERROR_INVALIDDATA; |
| 399 | } |
| 400 | |
| 401 | for (i = 0; i < s->header_size; i++) |
| 402 | s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE); |
| 403 | |
| 404 | if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0) |
| 405 | return ret; |
| 406 | |
| 407 | s->cur_chan = 0; |
| 408 | s->bitshift = 0; |
| 409 | |
| 410 | s->got_header = 1; |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | static int shorten_decode_frame(AVCodecContext *avctx, void *data, |
| 416 | int *got_frame_ptr, AVPacket *avpkt) |
| 417 | { |
| 418 | AVFrame *frame = data; |
| 419 | const uint8_t *buf = avpkt->data; |
| 420 | int buf_size = avpkt->size; |
| 421 | ShortenContext *s = avctx->priv_data; |
| 422 | int i, input_buf_size = 0; |
| 423 | int ret; |
| 424 | |
| 425 | /* allocate internal bitstream buffer */ |
| 426 | if (s->max_framesize == 0) { |
| 427 | void *tmp_ptr; |
| 428 | s->max_framesize = 8192; // should hopefully be enough for the first header |
| 429 | tmp_ptr = av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, |
| 430 | s->max_framesize + FF_INPUT_BUFFER_PADDING_SIZE); |
| 431 | if (!tmp_ptr) { |
| 432 | av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n"); |
| 433 | return AVERROR(ENOMEM); |
| 434 | } |
| 435 | memset(tmp_ptr, 0, s->allocated_bitstream_size); |
| 436 | s->bitstream = tmp_ptr; |
| 437 | } |
| 438 | |
| 439 | /* append current packet data to bitstream buffer */ |
| 440 | if (1 && s->max_framesize) { //FIXME truncated |
| 441 | buf_size = FFMIN(buf_size, s->max_framesize - s->bitstream_size); |
| 442 | input_buf_size = buf_size; |
| 443 | |
| 444 | if (s->bitstream_index + s->bitstream_size + buf_size + FF_INPUT_BUFFER_PADDING_SIZE > |
| 445 | s->allocated_bitstream_size) { |
| 446 | memmove(s->bitstream, &s->bitstream[s->bitstream_index], |
| 447 | s->bitstream_size); |
| 448 | s->bitstream_index = 0; |
| 449 | } |
| 450 | if (buf) |
| 451 | memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf, |
| 452 | buf_size); |
| 453 | buf = &s->bitstream[s->bitstream_index]; |
| 454 | buf_size += s->bitstream_size; |
| 455 | s->bitstream_size = buf_size; |
| 456 | |
| 457 | /* do not decode until buffer has at least max_framesize bytes or |
| 458 | * the end of the file has been reached */ |
| 459 | if (buf_size < s->max_framesize && avpkt->data) { |
| 460 | *got_frame_ptr = 0; |
| 461 | return input_buf_size; |
| 462 | } |
| 463 | } |
| 464 | /* init and position bitstream reader */ |
| 465 | init_get_bits(&s->gb, buf, buf_size * 8); |
| 466 | skip_bits(&s->gb, s->bitindex); |
| 467 | |
| 468 | /* process header or next subblock */ |
| 469 | if (!s->got_header) { |
| 470 | if ((ret = read_header(s)) < 0) |
| 471 | return ret; |
| 472 | *got_frame_ptr = 0; |
| 473 | goto finish_frame; |
| 474 | } |
| 475 | |
| 476 | /* if quit command was read previously, don't decode anything */ |
| 477 | if (s->got_quit_command) { |
| 478 | *got_frame_ptr = 0; |
| 479 | return avpkt->size; |
| 480 | } |
| 481 | |
| 482 | s->cur_chan = 0; |
| 483 | while (s->cur_chan < s->channels) { |
| 484 | unsigned cmd; |
| 485 | int len; |
| 486 | |
| 487 | if (get_bits_left(&s->gb) < 3 + FNSIZE) { |
| 488 | *got_frame_ptr = 0; |
| 489 | break; |
| 490 | } |
| 491 | |
| 492 | cmd = get_ur_golomb_shorten(&s->gb, FNSIZE); |
| 493 | |
| 494 | if (cmd > FN_VERBATIM) { |
| 495 | av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd); |
| 496 | *got_frame_ptr = 0; |
| 497 | break; |
| 498 | } |
| 499 | |
| 500 | if (!is_audio_command[cmd]) { |
| 501 | /* process non-audio command */ |
| 502 | switch (cmd) { |
| 503 | case FN_VERBATIM: |
| 504 | len = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE); |
| 505 | while (len--) |
| 506 | get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE); |
| 507 | break; |
| 508 | case FN_BITSHIFT: { |
| 509 | unsigned bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE); |
| 510 | if (bitshift > 31) { |
| 511 | av_log(avctx, AV_LOG_ERROR, "bitshift %d is invalid\n", |
| 512 | bitshift); |
| 513 | return AVERROR_INVALIDDATA; |
| 514 | } |
| 515 | s->bitshift = bitshift; |
| 516 | break; |
| 517 | } |
| 518 | case FN_BLOCKSIZE: { |
| 519 | unsigned blocksize = get_uint(s, av_log2(s->blocksize)); |
| 520 | if (blocksize > s->blocksize) { |
| 521 | av_log(avctx, AV_LOG_ERROR, |
| 522 | "Increasing block size is not supported\n"); |
| 523 | return AVERROR_PATCHWELCOME; |
| 524 | } |
| 525 | if (!blocksize || blocksize > MAX_BLOCKSIZE) { |
| 526 | av_log(avctx, AV_LOG_ERROR, "invalid or unsupported " |
| 527 | "block size: %d\n", blocksize); |
| 528 | return AVERROR(EINVAL); |
| 529 | } |
| 530 | s->blocksize = blocksize; |
| 531 | break; |
| 532 | } |
| 533 | case FN_QUIT: |
| 534 | s->got_quit_command = 1; |
| 535 | break; |
| 536 | } |
| 537 | if (cmd == FN_BLOCKSIZE || cmd == FN_QUIT) { |
| 538 | *got_frame_ptr = 0; |
| 539 | break; |
| 540 | } |
| 541 | } else { |
| 542 | /* process audio command */ |
| 543 | int residual_size = 0; |
| 544 | int channel = s->cur_chan; |
| 545 | int32_t coffset; |
| 546 | |
| 547 | /* get Rice code for residual decoding */ |
| 548 | if (cmd != FN_ZERO) { |
| 549 | residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE); |
| 550 | /* This is a hack as version 0 differed in the definition |
| 551 | * of get_sr_golomb_shorten(). */ |
| 552 | if (s->version == 0) |
| 553 | residual_size--; |
| 554 | } |
| 555 | |
| 556 | /* calculate sample offset using means from previous blocks */ |
| 557 | if (s->nmean == 0) |
| 558 | coffset = s->offset[channel][0]; |
| 559 | else { |
| 560 | int32_t sum = (s->version < 2) ? 0 : s->nmean / 2; |
| 561 | for (i = 0; i < s->nmean; i++) |
| 562 | sum += s->offset[channel][i]; |
| 563 | coffset = sum / s->nmean; |
| 564 | if (s->version >= 2) |
| 565 | coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1; |
| 566 | } |
| 567 | |
| 568 | /* decode samples for this channel */ |
| 569 | if (cmd == FN_ZERO) { |
| 570 | for (i = 0; i < s->blocksize; i++) |
| 571 | s->decoded[channel][i] = 0; |
| 572 | } else { |
| 573 | if ((ret = decode_subframe_lpc(s, cmd, channel, |
| 574 | residual_size, coffset)) < 0) |
| 575 | return ret; |
| 576 | } |
| 577 | |
| 578 | /* update means with info from the current block */ |
| 579 | if (s->nmean > 0) { |
| 580 | int32_t sum = (s->version < 2) ? 0 : s->blocksize / 2; |
| 581 | for (i = 0; i < s->blocksize; i++) |
| 582 | sum += s->decoded[channel][i]; |
| 583 | |
| 584 | for (i = 1; i < s->nmean; i++) |
| 585 | s->offset[channel][i - 1] = s->offset[channel][i]; |
| 586 | |
| 587 | if (s->version < 2) |
| 588 | s->offset[channel][s->nmean - 1] = sum / s->blocksize; |
| 589 | else |
| 590 | s->offset[channel][s->nmean - 1] = (sum / s->blocksize) << s->bitshift; |
| 591 | } |
| 592 | |
| 593 | /* copy wrap samples for use with next block */ |
| 594 | for (i = -s->nwrap; i < 0; i++) |
| 595 | s->decoded[channel][i] = s->decoded[channel][i + s->blocksize]; |
| 596 | |
| 597 | /* shift samples to add in unused zero bits which were removed |
| 598 | * during encoding */ |
| 599 | fix_bitshift(s, s->decoded[channel]); |
| 600 | |
| 601 | /* if this is the last channel in the block, output the samples */ |
| 602 | s->cur_chan++; |
| 603 | if (s->cur_chan == s->channels) { |
| 604 | uint8_t *samples_u8; |
| 605 | int16_t *samples_s16; |
| 606 | int chan; |
| 607 | |
| 608 | /* get output buffer */ |
| 609 | frame->nb_samples = s->blocksize; |
| 610 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 611 | return ret; |
| 612 | |
| 613 | for (chan = 0; chan < s->channels; chan++) { |
| 614 | samples_u8 = ((uint8_t **)frame->extended_data)[chan]; |
| 615 | samples_s16 = ((int16_t **)frame->extended_data)[chan]; |
| 616 | for (i = 0; i < s->blocksize; i++) { |
| 617 | switch (s->internal_ftype) { |
| 618 | case TYPE_U8: |
| 619 | *samples_u8++ = av_clip_uint8(s->decoded[chan][i]); |
| 620 | break; |
| 621 | case TYPE_S16HL: |
| 622 | case TYPE_S16LH: |
| 623 | *samples_s16++ = av_clip_int16(s->decoded[chan][i]); |
| 624 | break; |
| 625 | } |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | *got_frame_ptr = 1; |
| 630 | } |
| 631 | } |
| 632 | } |
| 633 | if (s->cur_chan < s->channels) |
| 634 | *got_frame_ptr = 0; |
| 635 | |
| 636 | finish_frame: |
| 637 | s->bitindex = get_bits_count(&s->gb) - 8 * (get_bits_count(&s->gb) / 8); |
| 638 | i = get_bits_count(&s->gb) / 8; |
| 639 | if (i > buf_size) { |
| 640 | av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size); |
| 641 | s->bitstream_size = 0; |
| 642 | s->bitstream_index = 0; |
| 643 | return AVERROR_INVALIDDATA; |
| 644 | } |
| 645 | if (s->bitstream_size) { |
| 646 | s->bitstream_index += i; |
| 647 | s->bitstream_size -= i; |
| 648 | return input_buf_size; |
| 649 | } else |
| 650 | return i; |
| 651 | } |
| 652 | |
| 653 | static av_cold int shorten_decode_close(AVCodecContext *avctx) |
| 654 | { |
| 655 | ShortenContext *s = avctx->priv_data; |
| 656 | int i; |
| 657 | |
| 658 | for (i = 0; i < s->channels; i++) { |
| 659 | s->decoded[i] = NULL; |
| 660 | av_freep(&s->decoded_base[i]); |
| 661 | av_freep(&s->offset[i]); |
| 662 | } |
| 663 | av_freep(&s->bitstream); |
| 664 | av_freep(&s->coeffs); |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | AVCodec ff_shorten_decoder = { |
| 670 | .name = "shorten", |
| 671 | .long_name = NULL_IF_CONFIG_SMALL("Shorten"), |
| 672 | .type = AVMEDIA_TYPE_AUDIO, |
| 673 | .id = AV_CODEC_ID_SHORTEN, |
| 674 | .priv_data_size = sizeof(ShortenContext), |
| 675 | .init = shorten_decode_init, |
| 676 | .close = shorten_decode_close, |
| 677 | .decode = shorten_decode_frame, |
| 678 | .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, |
| 679 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
| 680 | AV_SAMPLE_FMT_U8P, |
| 681 | AV_SAMPLE_FMT_NONE }, |
| 682 | }; |