1/* 2 * LCL (LossLess Codec Library) Codec 3 * Copyright (c) 2002-2004 Roberto Togni 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 * LCL (LossLess Codec Library) Video Codec 25 * Decoder for MSZH and ZLIB codecs 26 * Experimental encoder for ZLIB RGB24 27 * 28 * Fourcc: MSZH, ZLIB 29 * 30 * Original Win32 dll: 31 * Ver2.23 By Kenji Oshima 2000.09.20 32 * avimszh.dll, avizlib.dll 33 * 34 * A description of the decoding algorithm can be found here: 35 * http://www.pcisys.net/~melanson/codecs 36 * 37 * Supports: BGR24 (RGB 24bpp) 38 * 39 */ 40 41#include <stdio.h> 42#include <stdlib.h> 43 44#include "avcodec.h" 45#include "bytestream.h" 46#include "lcl.h" 47#include "libavutil/lzo.h" 48 49#if CONFIG_ZLIB_DECODER 50#include <zlib.h> 51#endif 52 53/* 54 * Decoder context 55 */ 56typedef struct LclDecContext { 57 AVFrame pic; 58 59 // Image type 60 int imgtype; 61 // Compression type 62 int compression; 63 // Flags 64 int flags; 65 // Decompressed data size 66 unsigned int decomp_size; 67 // Decompression buffer 68 unsigned char* decomp_buf; 69#if CONFIG_ZLIB_DECODER 70 z_stream zstream; 71#endif 72} LclDecContext; 73 74 75/** 76 * \param srcptr compressed source buffer, must be padded with at least 5 extra bytes 77 * \param destptr must be padded sufficiently for av_memcpy_backptr 78 */ 79static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize) 80{ 81 unsigned char *destptr_bak = destptr; 82 unsigned char *destptr_end = destptr + destsize; 83 const unsigned char *srcptr_end = srcptr + srclen; 84 unsigned mask = *srcptr++; 85 unsigned maskbit = 0x80; 86 87 while (srcptr < srcptr_end && destptr < destptr_end) { 88 if (!(mask & maskbit)) { 89 memcpy(destptr, srcptr, 4); 90 destptr += 4; 91 srcptr += 4; 92 } else { 93 unsigned ofs = bytestream_get_le16(&srcptr); 94 unsigned cnt = (ofs >> 11) + 1; 95 ofs &= 0x7ff; 96 ofs = FFMIN(ofs, destptr - destptr_bak); 97 cnt *= 4; 98 cnt = FFMIN(cnt, destptr_end - destptr); 99 av_memcpy_backptr(destptr, ofs, cnt); 100 destptr += cnt; 101 } 102 maskbit >>= 1; 103 if (!maskbit) { 104 mask = *srcptr++; 105 while (!mask) { 106 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break; 107 memcpy(destptr, srcptr, 32); 108 destptr += 32; 109 srcptr += 32; 110 mask = *srcptr++; 111 } 112 maskbit = 0x80; 113 } 114 } 115 116 return destptr - destptr_bak; 117} 118 119 120/** 121 * \brief decompress a zlib-compressed data block into decomp_buf 122 * \param src compressed input buffer 123 * \param src_len data length in input buffer 124 * \param offset offset in decomp_buf 125 * \param expected expected decompressed length 126 */ 127#if CONFIG_ZLIB_DECODER 128static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected) 129{ 130 LclDecContext *c = avctx->priv_data; 131 int zret = inflateReset(&c->zstream); 132 if (zret != Z_OK) { 133 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret); 134 return -1; 135 } 136 c->zstream.next_in = src; 137 c->zstream.avail_in = src_len; 138 c->zstream.next_out = c->decomp_buf + offset; 139 c->zstream.avail_out = c->decomp_size - offset; 140 zret = inflate(&c->zstream, Z_FINISH); 141 if (zret != Z_OK && zret != Z_STREAM_END) { 142 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret); 143 return -1; 144 } 145 if (expected != (unsigned int)c->zstream.total_out) { 146 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n", 147 expected, c->zstream.total_out); 148 return -1; 149 } 150 return c->zstream.total_out; 151} 152#endif 153 154 155/* 156 * 157 * Decode a frame 158 * 159 */ 160static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) 161{ 162 const uint8_t *buf = avpkt->data; 163 int buf_size = avpkt->size; 164 LclDecContext * const c = avctx->priv_data; 165 unsigned char *encoded = (unsigned char *)buf; 166 unsigned int pixel_ptr; 167 int row, col; 168 unsigned char *outptr; 169 uint8_t *y_out, *u_out, *v_out; 170 unsigned int width = avctx->width; // Real image width 171 unsigned int height = avctx->height; // Real image height 172 unsigned int mszh_dlen; 173 unsigned char yq, y1q, uq, vq; 174 int uqvq; 175 unsigned int mthread_inlen, mthread_outlen; 176 unsigned int len = buf_size; 177 178 if(c->pic.data[0]) 179 avctx->release_buffer(avctx, &c->pic); 180 181 c->pic.reference = 0; 182 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; 183 if(avctx->get_buffer(avctx, &c->pic) < 0){ 184 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 185 return -1; 186 } 187 188 outptr = c->pic.data[0]; // Output image pointer 189 190 /* Decompress frame */ 191 switch (avctx->codec_id) { 192 case CODEC_ID_MSZH: 193 switch (c->compression) { 194 case COMP_MSZH: 195 if (c->flags & FLAG_MULTITHREAD) { 196 mthread_inlen = AV_RL32(encoded); 197 mthread_inlen = FFMIN(mthread_inlen, len - 8); 198 mthread_outlen = AV_RL32(encoded+4); 199 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size); 200 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size); 201 if (mthread_outlen != mszh_dlen) { 202 av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n", 203 mthread_outlen, mszh_dlen); 204 return -1; 205 } 206 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen, 207 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen); 208 if (mthread_outlen != mszh_dlen) { 209 av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n", 210 mthread_outlen, mszh_dlen); 211 return -1; 212 } 213 encoded = c->decomp_buf; 214 len = c->decomp_size; 215 } else { 216 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size); 217 if (c->decomp_size != mszh_dlen) { 218 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n", 219 c->decomp_size, mszh_dlen); 220 return -1; 221 } 222 encoded = c->decomp_buf; 223 len = mszh_dlen; 224 } 225 break; 226 case COMP_MSZH_NOCOMP: 227 break; 228 default: 229 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n"); 230 return -1; 231 } 232 break; 233#if CONFIG_ZLIB_DECODER 234 case CODEC_ID_ZLIB: 235 /* Using the original dll with normal compression (-1) and RGB format 236 * gives a file with ZLIB fourcc, but frame is really uncompressed. 237 * To be sure that's true check also frame size */ 238 if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 && 239 len == width * height * 3) 240 break; 241 if (c->flags & FLAG_MULTITHREAD) { 242 int ret; 243 mthread_inlen = AV_RL32(encoded); 244 mthread_inlen = FFMIN(mthread_inlen, len - 8); 245 mthread_outlen = AV_RL32(encoded+4); 246 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size); 247 ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen); 248 if (ret < 0) return ret; 249 ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen, 250 mthread_outlen, mthread_outlen); 251 if (ret < 0) return ret; 252 } else { 253 int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size); 254 if (ret < 0) return ret; 255 } 256 encoded = c->decomp_buf; 257 len = c->decomp_size; 258 break; 259#endif 260 default: 261 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n"); 262 return -1; 263 } 264 265 266 /* Apply PNG filter */ 267 if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) { 268 switch (c->imgtype) { 269 case IMGTYPE_YUV111: 270 case IMGTYPE_RGB24: 271 for (row = 0; row < height; row++) { 272 pixel_ptr = row * width * 3; 273 yq = encoded[pixel_ptr++]; 274 uqvq = AV_RL16(encoded+pixel_ptr); 275 pixel_ptr += 2; 276 for (col = 1; col < width; col++) { 277 encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; 278 uqvq -= AV_RL16(encoded+pixel_ptr+1); 279 AV_WL16(encoded+pixel_ptr+1, uqvq); 280 pixel_ptr += 3; 281 } 282 } 283 break; 284 case IMGTYPE_YUV422: 285 for (row = 0; row < height; row++) { 286 pixel_ptr = row * width * 2; 287 yq = uq = vq =0; 288 for (col = 0; col < width/4; col++) { 289 encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; 290 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; 291 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2]; 292 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3]; 293 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; 294 encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5]; 295 encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6]; 296 encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7]; 297 pixel_ptr += 8; 298 } 299 } 300 break; 301 case IMGTYPE_YUV411: 302 for (row = 0; row < height; row++) { 303 pixel_ptr = row * width / 2 * 3; 304 yq = uq = vq =0; 305 for (col = 0; col < width/4; col++) { 306 encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; 307 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; 308 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2]; 309 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3]; 310 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; 311 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5]; 312 pixel_ptr += 6; 313 } 314 } 315 break; 316 case IMGTYPE_YUV211: 317 for (row = 0; row < height; row++) { 318 pixel_ptr = row * width * 2; 319 yq = uq = vq =0; 320 for (col = 0; col < width/2; col++) { 321 encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; 322 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; 323 encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2]; 324 encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3]; 325 pixel_ptr += 4; 326 } 327 } 328 break; 329 case IMGTYPE_YUV420: 330 for (row = 0; row < height/2; row++) { 331 pixel_ptr = row * width * 3; 332 yq = y1q = uq = vq =0; 333 for (col = 0; col < width/2; col++) { 334 encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; 335 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; 336 encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2]; 337 encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3]; 338 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; 339 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5]; 340 pixel_ptr += 6; 341 } 342 } 343 break; 344 default: 345 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n"); 346 return -1; 347 } 348 } 349 350 /* Convert colorspace */ 351 y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0]; 352 u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1]; 353 v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2]; 354 switch (c->imgtype) { 355 case IMGTYPE_YUV111: 356 for (row = 0; row < height; row++) { 357 for (col = 0; col < width; col++) { 358 y_out[col] = *encoded++; 359 u_out[col] = *encoded++ + 128; 360 v_out[col] = *encoded++ + 128; 361 } 362 y_out -= c->pic.linesize[0]; 363 u_out -= c->pic.linesize[1]; 364 v_out -= c->pic.linesize[2]; 365 } 366 break; 367 case IMGTYPE_YUV422: 368 for (row = 0; row < height; row++) { 369 for (col = 0; col < width - 3; col += 4) { 370 memcpy(y_out + col, encoded, 4); 371 encoded += 4; 372 u_out[ col >> 1 ] = *encoded++ + 128; 373 u_out[(col >> 1) + 1] = *encoded++ + 128; 374 v_out[ col >> 1 ] = *encoded++ + 128; 375 v_out[(col >> 1) + 1] = *encoded++ + 128; 376 } 377 y_out -= c->pic.linesize[0]; 378 u_out -= c->pic.linesize[1]; 379 v_out -= c->pic.linesize[2]; 380 } 381 break; 382 case IMGTYPE_RGB24: 383 for (row = height - 1; row >= 0; row--) { 384 pixel_ptr = row * c->pic.linesize[0]; 385 memcpy(outptr + pixel_ptr, encoded, 3 * width); 386 encoded += 3 * width; 387 } 388 break; 389 case IMGTYPE_YUV411: 390 for (row = 0; row < height; row++) { 391 for (col = 0; col < width - 3; col += 4) { 392 memcpy(y_out + col, encoded, 4); 393 encoded += 4; 394 u_out[col >> 2] = *encoded++ + 128; 395 v_out[col >> 2] = *encoded++ + 128; 396 } 397 y_out -= c->pic.linesize[0]; 398 u_out -= c->pic.linesize[1]; 399 v_out -= c->pic.linesize[2]; 400 } 401 break; 402 case IMGTYPE_YUV211: 403 for (row = 0; row < height; row++) { 404 for (col = 0; col < width - 1; col += 2) { 405 memcpy(y_out + col, encoded, 2); 406 encoded += 2; 407 u_out[col >> 1] = *encoded++ + 128; 408 v_out[col >> 1] = *encoded++ + 128; 409 } 410 y_out -= c->pic.linesize[0]; 411 u_out -= c->pic.linesize[1]; 412 v_out -= c->pic.linesize[2]; 413 } 414 break; 415 case IMGTYPE_YUV420: 416 u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1]; 417 v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2]; 418 for (row = 0; row < height - 1; row += 2) { 419 for (col = 0; col < width - 1; col += 2) { 420 memcpy(y_out + col, encoded, 2); 421 encoded += 2; 422 memcpy(y_out + col - c->pic.linesize[0], encoded, 2); 423 encoded += 2; 424 u_out[col >> 1] = *encoded++ + 128; 425 v_out[col >> 1] = *encoded++ + 128; 426 } 427 y_out -= c->pic.linesize[0] << 1; 428 u_out -= c->pic.linesize[1]; 429 v_out -= c->pic.linesize[2]; 430 } 431 break; 432 default: 433 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n"); 434 return -1; 435 } 436 437 *data_size = sizeof(AVFrame); 438 *(AVFrame*)data = c->pic; 439 440 /* always report that the buffer was completely consumed */ 441 return buf_size; 442} 443 444/* 445 * 446 * Init lcl decoder 447 * 448 */ 449static av_cold int decode_init(AVCodecContext *avctx) 450{ 451 LclDecContext * const c = avctx->priv_data; 452 unsigned int basesize = avctx->width * avctx->height; 453 unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING; 454 unsigned int max_decomp_size; 455 456 if (avctx->extradata_size < 8) { 457 av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n"); 458 return 1; 459 } 460 461 /* Check codec type */ 462 if ((avctx->codec_id == CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) || 463 (avctx->codec_id == CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) { 464 av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n"); 465 } 466 467 /* Detect image type */ 468 switch (c->imgtype = avctx->extradata[4]) { 469 case IMGTYPE_YUV111: 470 c->decomp_size = basesize * 3; 471 max_decomp_size = max_basesize * 3; 472 avctx->pix_fmt = PIX_FMT_YUV444P; 473 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n"); 474 break; 475 case IMGTYPE_YUV422: 476 c->decomp_size = basesize * 2; 477 max_decomp_size = max_basesize * 2; 478 avctx->pix_fmt = PIX_FMT_YUV422P; 479 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n"); 480 break; 481 case IMGTYPE_RGB24: 482 c->decomp_size = basesize * 3; 483 max_decomp_size = max_basesize * 3; 484 avctx->pix_fmt = PIX_FMT_BGR24; 485 av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n"); 486 break; 487 case IMGTYPE_YUV411: 488 c->decomp_size = basesize / 2 * 3; 489 max_decomp_size = max_basesize / 2 * 3; 490 avctx->pix_fmt = PIX_FMT_YUV411P; 491 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n"); 492 break; 493 case IMGTYPE_YUV211: 494 c->decomp_size = basesize * 2; 495 max_decomp_size = max_basesize * 2; 496 avctx->pix_fmt = PIX_FMT_YUV422P; 497 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n"); 498 break; 499 case IMGTYPE_YUV420: 500 c->decomp_size = basesize / 2 * 3; 501 max_decomp_size = max_basesize / 2 * 3; 502 avctx->pix_fmt = PIX_FMT_YUV420P; 503 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n"); 504 break; 505 default: 506 av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype); 507 return 1; 508 } 509 510 /* Detect compression method */ 511 c->compression = (int8_t)avctx->extradata[5]; 512 switch (avctx->codec_id) { 513 case CODEC_ID_MSZH: 514 switch (c->compression) { 515 case COMP_MSZH: 516 av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n"); 517 break; 518 case COMP_MSZH_NOCOMP: 519 c->decomp_size = 0; 520 av_log(avctx, AV_LOG_DEBUG, "No compression.\n"); 521 break; 522 default: 523 av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression); 524 return 1; 525 } 526 break; 527#if CONFIG_ZLIB_DECODER 528 case CODEC_ID_ZLIB: 529 switch (c->compression) { 530 case COMP_ZLIB_HISPEED: 531 av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n"); 532 break; 533 case COMP_ZLIB_HICOMP: 534 av_log(avctx, AV_LOG_DEBUG, "High compression.\n"); 535 break; 536 case COMP_ZLIB_NORMAL: 537 av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n"); 538 break; 539 default: 540 if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) { 541 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression); 542 return 1; 543 } 544 av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression); 545 } 546 break; 547#endif 548 default: 549 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n"); 550 return 1; 551 } 552 553 /* Allocate decompression buffer */ 554 if (c->decomp_size) { 555 if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) { 556 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); 557 return 1; 558 } 559 } 560 561 /* Detect flags */ 562 c->flags = avctx->extradata[6]; 563 if (c->flags & FLAG_MULTITHREAD) 564 av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n"); 565 if (c->flags & FLAG_NULLFRAME) 566 av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n"); 567 if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) 568 av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n"); 569 if (c->flags & FLAGMASK_UNUSED) 570 av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags); 571 572 /* If needed init zlib */ 573#if CONFIG_ZLIB_DECODER 574 if (avctx->codec_id == CODEC_ID_ZLIB) { 575 int zret; 576 c->zstream.zalloc = Z_NULL; 577 c->zstream.zfree = Z_NULL; 578 c->zstream.opaque = Z_NULL; 579 zret = inflateInit(&c->zstream); 580 if (zret != Z_OK) { 581 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); 582 av_freep(&c->decomp_buf); 583 return 1; 584 } 585 } 586#endif 587 588 return 0; 589} 590 591/* 592 * 593 * Uninit lcl decoder 594 * 595 */ 596static av_cold int decode_end(AVCodecContext *avctx) 597{ 598 LclDecContext * const c = avctx->priv_data; 599 600 av_freep(&c->decomp_buf); 601 if (c->pic.data[0]) 602 avctx->release_buffer(avctx, &c->pic); 603#if CONFIG_ZLIB_DECODER 604 if (avctx->codec_id == CODEC_ID_ZLIB) 605 inflateEnd(&c->zstream); 606#endif 607 608 return 0; 609} 610 611#if CONFIG_MSZH_DECODER 612AVCodec mszh_decoder = { 613 "mszh", 614 AVMEDIA_TYPE_VIDEO, 615 CODEC_ID_MSZH, 616 sizeof(LclDecContext), 617 decode_init, 618 NULL, 619 decode_end, 620 decode_frame, 621 CODEC_CAP_DR1, 622 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"), 623}; 624#endif 625 626#if CONFIG_ZLIB_DECODER 627AVCodec zlib_decoder = { 628 "zlib", 629 AVMEDIA_TYPE_VIDEO, 630 CODEC_ID_ZLIB, 631 sizeof(LclDecContext), 632 decode_init, 633 NULL, 634 decode_end, 635 decode_frame, 636 CODEC_CAP_DR1, 637 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"), 638}; 639#endif 640