libavcodec/lcl.c

   1 /*
   2  * LCL (LossLess Codec Library) Codec
   3  * Copyright (c) 2002-2004 Roberto Togni
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 /**
  22  * @file lcl.c
  23  * LCL (LossLess Codec Library) Video Codec
  24  * Decoder for MSZH and ZLIB codecs
  25  * Experimental encoder for ZLIB RGB24
  26  *
  27  * Fourcc: MSZH, ZLIB
  28  *
  29  * Original Win32 dll:
  30  * Ver2.23 By Kenji Oshima 2000.09.20
  31  * avimszh.dll, avizlib.dll
  32  *
  33  * A description of the decoding algorithm can be found here:
  34  *   http://www.pcisys.net/~melanson/codecs
  35  *
  36  * Supports: BGR24 (RGB 24bpp)
  37  *
  38  */
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42
  43 #include "common.h"
  44 #include "bitstream.h"
  45 #include "avcodec.h"
  46
  47 #ifdef CONFIG_ZLIB
  48 #include <zlib.h>
  49 #endif
  50
  51
  52 #define BMPTYPE_YUV 1
  53 #define BMPTYPE_RGB 2
  54
  55 #define IMGTYPE_YUV111 0
  56 #define IMGTYPE_YUV422 1
  57 #define IMGTYPE_RGB24 2
  58 #define IMGTYPE_YUV411 3
  59 #define IMGTYPE_YUV211 4
  60 #define IMGTYPE_YUV420 5
  61
  62 #define COMP_MSZH 0
  63 #define COMP_MSZH_NOCOMP 1
  64 #define COMP_ZLIB_HISPEED 1
  65 #define COMP_ZLIB_HICOMP 9
  66 #define COMP_ZLIB_NORMAL -1
  67
  68 #define FLAG_MULTITHREAD 1
  69 #define FLAG_NULLFRAME 2
  70 #define FLAG_PNGFILTER 4
  71 #define FLAGMASK_UNUSED 0xf8
  72
  73 #define CODEC_MSZH 1
  74 #define CODEC_ZLIB 3
  75
  76 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
  77 #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
  78
  79 /*
  80  * Decoder context
  81  */
  82 typedef struct LclContext {
  83
  84         AVCodecContext *avctx;
  85         AVFrame pic;
  86     PutBitContext pb;
  87
  88     // Image type
  89     int imgtype;
  90     // Compression type
  91     int compression;
  92     // Flags
  93     int flags;
  94     // Decompressed data size
  95     unsigned int decomp_size;
  96     // Decompression buffer
  97     unsigned char* decomp_buf;
  98     // Maximum compressed data size
  99     unsigned int max_comp_size;
 100     // Compression buffer
 101     unsigned char* comp_buf;
 102 #ifdef CONFIG_ZLIB
 103     z_stream zstream;
 104 #endif
 105 } LclContext;
 106
 107
 108 /*
 109  *
 110  * Helper functions
 111  *
 112  */
 113 static inline unsigned char fix (int pix14)
 114 {
 115     int tmp;
 116
 117     tmp = (pix14 + 0x80000) >> 20;
 118     if (tmp < 0)
 119         return 0;
 120     if (tmp > 255)
 121         return 255;
 122     return tmp;
 123 }
 124
 125
 126
 127 static inline unsigned char get_b (unsigned char yq, signed char bq)
 128 {
 129     return fix((yq << 20) + bq * 1858076);
 130 }
 131
 132
 133
 134 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
 135 {
 136     return fix((yq << 20) - bq * 360857 - rq * 748830);
 137 }
 138
 139
 140
 141 static inline unsigned char get_r (unsigned char yq, signed char rq)
 142 {
 143     return fix((yq << 20) + rq * 1470103);
 144 }
 145
 146
 147
 148 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
 149 {
 150     unsigned char *destptr_bak = destptr;
 151     unsigned char *destptr_end = destptr + destsize;
 152     unsigned char mask = 0;
 153     unsigned char maskbit = 0;
 154     unsigned int ofs, cnt;
 155
 156     while ((srclen > 0) && (destptr < destptr_end)) {
 157         if (maskbit == 0) {
 158             mask = *(srcptr++);
 159             maskbit = 8;
 160             srclen--;
 161             continue;
 162         }
 163         if ((mask & (1 << (--maskbit))) == 0) {
 164             if (destptr + 4 > destptr_end)
 165                 break;
 166             *(int*)destptr = *(int*)srcptr;
 167             srclen -= 4;
 168             destptr += 4;
 169             srcptr += 4;
 170         } else {
 171             ofs = *(srcptr++);
 172             cnt = *(srcptr++);
 173             ofs += cnt * 256;;
 174             cnt = ((cnt >> 3) & 0x1f) + 1;
 175             ofs &= 0x7ff;
 176             srclen -= 2;
 177             cnt *= 4;
 178             if (destptr + cnt > destptr_end) {
 179                 cnt =  destptr_end - destptr;
 180             }
 181             for (; cnt > 0; cnt--) {
 182                 *(destptr) = *(destptr - ofs);
 183                 destptr++;
 184             }
 185         }
 186     }
 187
 188     return (destptr - destptr_bak);
 189 }
 190
 191
 192
 193
 194 /*
 195  *
 196  * Decode a frame
 197  *
 198  */
 199 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
 200 {
 201         LclContext * const c = (LclContext *)avctx->priv_data;
 202         unsigned char *encoded = (unsigned char *)buf;
 203     unsigned int pixel_ptr;
 204     int row, col;
 205     unsigned char *outptr;
 206     unsigned int width = avctx->width; // Real image width
 207     unsigned int height = avctx->height; // Real image height
 208     unsigned int mszh_dlen;
 209     unsigned char yq, y1q, uq, vq;
 210     int uqvq;
 211     unsigned int mthread_inlen, mthread_outlen;
 212 #ifdef CONFIG_ZLIB
 213     int zret; // Zlib return code
 214 #endif
 215     unsigned int len = buf_size;
 216
 217         /* no supplementary picture */
 218         if (buf_size == 0)
 219                 return 0;
 220
 221         if(c->pic.data[0])
 222                 avctx->release_buffer(avctx, &c->pic);
 223
 224         c->pic.reference = 0;
 225         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
 226         if(avctx->get_buffer(avctx, &c->pic) < 0){
 227                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 228                 return -1;
 229         }
 230
 231     outptr = c->pic.data[0]; // Output image pointer
 232
 233     /* Decompress frame */
 234     switch (avctx->codec_id) {
 235         case CODEC_ID_MSZH:
 236             switch (c->compression) {
 237                 case COMP_MSZH:
 238                     if (c->flags & FLAG_MULTITHREAD) {
 239                         mthread_inlen = *((unsigned int*)encoded);
 240                         mthread_outlen = *((unsigned int*)(encoded+4));
 241                         if (mthread_outlen > c->decomp_size) // this should not happen
 242                             mthread_outlen = c->decomp_size;
 243                         mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
 244                         if (mthread_outlen != mszh_dlen) {
 245                             av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
 246                                    mthread_outlen, mszh_dlen);
 247                             return -1;
 248                         }
 249                         mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
 250                                                 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
 251                         if (mthread_outlen != mszh_dlen) {
 252                             av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
 253                                    mthread_outlen, mszh_dlen);
 254                             return -1;
 255                         }
 256                         encoded = c->decomp_buf;
 257                         len = c->decomp_size;
 258                     } else {
 259                         mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
 260                         if (c->decomp_size != mszh_dlen) {
 261                             av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
 262                                    c->decomp_size, mszh_dlen);
 263                             return -1;
 264                         }
 265                         encoded = c->decomp_buf;
 266                         len = mszh_dlen;
 267                     }
 268                     break;
 269                 case COMP_MSZH_NOCOMP:
 270                     break;
 271                 default:
 272                     av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
 273                     return -1;
 274             }
 275             break;
 276         case CODEC_ID_ZLIB:
 277 #ifdef CONFIG_ZLIB
 278             /* Using the original dll with normal compression (-1) and RGB format
 279              * gives a file with ZLIB fourcc, but frame is really uncompressed.
 280              * To be sure that's true check also frame size */
 281             if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
 282                (len == width * height * 3))
 283                 break;
 284             zret = inflateReset(&(c->zstream));
 285             if (zret != Z_OK) {
 286                 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 287                 return -1;
 288             }
 289             if (c->flags & FLAG_MULTITHREAD) {
 290                 mthread_inlen = *((unsigned int*)encoded);
 291                 mthread_outlen = *((unsigned int*)(encoded+4));
 292                 if (mthread_outlen > c->decomp_size)
 293                     mthread_outlen = c->decomp_size;
 294                 c->zstream.next_in = encoded + 8;
 295                 c->zstream.avail_in = mthread_inlen;
 296                 c->zstream.next_out = c->decomp_buf;
 297                 c->zstream.avail_out = c->decomp_size;
 298                 zret = inflate(&(c->zstream), Z_FINISH);
 299                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 300                     av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
 301                     return -1;
 302                 }
 303                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 304                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
 305                            mthread_outlen, c->zstream.total_out);
 306                     return -1;
 307                 }
 308                 zret = inflateReset(&(c->zstream));
 309                 if (zret != Z_OK) {
 310                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
 311                     return -1;
 312                 }
 313                 c->zstream.next_in = encoded + 8 + mthread_inlen;
 314                 c->zstream.avail_in = len - mthread_inlen;
 315                 c->zstream.next_out = c->decomp_buf + mthread_outlen;
 316                 c->zstream.avail_out = c->decomp_size - mthread_outlen;
 317                 zret = inflate(&(c->zstream), Z_FINISH);
 318                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 319                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
 320                     return -1;
 321                 }
 322                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 323                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
 324                            mthread_outlen, c->zstream.total_out);
 325                     return -1;
 326                 }
 327             } else {
 328                 c->zstream.next_in = encoded;
 329                 c->zstream.avail_in = len;
 330                 c->zstream.next_out = c->decomp_buf;
 331                 c->zstream.avail_out = c->decomp_size;
 332                 zret = inflate(&(c->zstream), Z_FINISH);
 333                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 334                     av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
 335                     return -1;
 336                 }
 337                 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
 338                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
 339                            c->decomp_size, c->zstream.total_out);
 340                     return -1;
 341                 }
 342             }
 343             encoded = c->decomp_buf;
 344             len = c->decomp_size;;
 345 #else
 346             av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
 347             return -1;
 348 #endif
 349             break;
 350         default:
 351             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
 352             return -1;
 353     }
 354
 355
 356     /* Apply PNG filter */
 357     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
 358         switch (c->imgtype) {
 359             case IMGTYPE_YUV111:
 360             case IMGTYPE_RGB24:
 361                 for (row = 0; row < height; row++) {
 362                     pixel_ptr = row * width * 3;
 363                     yq = encoded[pixel_ptr++];
 364                     uqvq = encoded[pixel_ptr++];
 365                   uqvq+=(encoded[pixel_ptr++] << 8);
 366                     for (col = 1; col < width; col++) {
 367                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 368                         uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
 369                         encoded[pixel_ptr+1] = (uqvq) & 0xff;
 370                         encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
 371                         pixel_ptr += 3;
 372                     }
 373                 }
 374                 break;
 375             case IMGTYPE_YUV422:
 376                 for (row = 0; row < height; row++) {
 377                     pixel_ptr = row * width * 2;
 378                     yq = uq = vq =0;
 379                     for (col = 0; col < width/4; col++) {
 380                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 381                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 382                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 383                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 384                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 385                         encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
 386                         encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
 387                         encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
 388                         pixel_ptr += 8;
 389                     }
 390                 }
 391                 break;
 392             case IMGTYPE_YUV411:
 393                 for (row = 0; row < height; row++) {
 394                     pixel_ptr = row * width / 2 * 3;
 395                     yq = uq = vq =0;
 396                     for (col = 0; col < width/4; col++) {
 397                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 398                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 399                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 400                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 401                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 402                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 403                         pixel_ptr += 6;
 404                     }
 405                 }
 406                 break;
 407             case IMGTYPE_YUV211:
 408                 for (row = 0; row < height; row++) {
 409                     pixel_ptr = row * width * 2;
 410                     yq = uq = vq =0;
 411                     for (col = 0; col < width/2; col++) {
 412                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 413                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 414                         encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
 415                         encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
 416                         pixel_ptr += 4;
 417                     }
 418                 }
 419                 break;
 420             case IMGTYPE_YUV420:
 421                 for (row = 0; row < height/2; row++) {
 422                     pixel_ptr = row * width * 3;
 423                     yq = y1q = uq = vq =0;
 424                     for (col = 0; col < width/2; col++) {
 425                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 426                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 427                         encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
 428                         encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
 429                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 430                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 431                         pixel_ptr += 6;
 432                     }
 433                 }
 434                 break;
 435             default:
 436                 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
 437                 return -1;
 438         }
 439     }
 440
 441     /* Convert colorspace */
 442     switch (c->imgtype) {
 443         case IMGTYPE_YUV111:
 444             for (row = height - 1; row >= 0; row--) {
 445                 pixel_ptr = row * c->pic.linesize[0];
 446                 for (col = 0; col < width; col++) {
 447                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
 448                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
 449                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
 450                     encoded += 3;
 451                 }
 452             }
 453             break;
 454         case IMGTYPE_YUV422:
 455             for (row = height - 1; row >= 0; row--) {
 456                 pixel_ptr = row * c->pic.linesize[0];
 457                 for (col = 0; col < width/4; col++) {
 458                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 459                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
 460                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
 461                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 462                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
 463                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
 464                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
 465                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
 466                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
 467                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
 468                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
 469                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
 470                     encoded += 8;
 471                 }
 472             }
 473             break;
 474         case IMGTYPE_RGB24:
 475             for (row = height - 1; row >= 0; row--) {
 476                 pixel_ptr = row * c->pic.linesize[0];
 477                 for (col = 0; col < width; col++) {
 478                     outptr[pixel_ptr++] = encoded[0];
 479                     outptr[pixel_ptr++] = encoded[1];
 480                     outptr[pixel_ptr++] = encoded[2];
 481                     encoded += 3;
 482                 }
 483             }
 484             break;
 485         case IMGTYPE_YUV411:
 486             for (row = height - 1; row >= 0; row--) {
 487                 pixel_ptr = row * c->pic.linesize[0];
 488                 for (col = 0; col < width/4; col++) {
 489                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 490                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
 491                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
 492                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 493                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
 494                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
 495                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
 496                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
 497                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
 498                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
 499                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
 500                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
 501                     encoded += 6;
 502                 }
 503             }
 504             break;
 505         case IMGTYPE_YUV211:
 506             for (row = height - 1; row >= 0; row--) {
 507                 pixel_ptr = row * c->pic.linesize[0];
 508                 for (col = 0; col < width/2; col++) {
 509                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
 510                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
 511                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
 512                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
 513                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
 514                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
 515                     encoded += 4;
 516                 }
 517             }
 518             break;
 519         case IMGTYPE_YUV420:
 520             for (row = height / 2 - 1; row >= 0; row--) {
 521                 pixel_ptr = 2 * row * c->pic.linesize[0];
 522                 for (col = 0; col < width/2; col++) {
 523                     outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
 524                     outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
 525                     outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
 526                     outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
 527                     outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
 528                     outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
 529                     outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
 530                     outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
 531                     outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
 532                     outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
 533                     outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
 534                     outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
 535                     pixel_ptr += 6;
 536                     encoded += 6;
 537                 }
 538             }
 539             break;
 540         default:
 541             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
 542             return -1;
 543     }
 544
 545     *data_size = sizeof(AVFrame);
 546     *(AVFrame*)data = c->pic;
 547
 548     /* always report that the buffer was completely consumed */
 549     return buf_size;
 550 }
 551
 552
 553
 554 /*
 555  *
 556  * Encode a frame
 557  *
 558  */
 559 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 560     LclContext *c = avctx->priv_data;
 561     AVFrame *pict = data;
 562     AVFrame * const p = &c->pic;
 563     int i;
 564     int zret; // Zlib return code
 565
 566 #ifndef CONFIG_ZLIB
 567     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
 568     return -1;
 569 #else
 570
 571     init_put_bits(&c->pb, buf, buf_size);
 572
 573     *p = *pict;
 574     p->pict_type= FF_I_TYPE;
 575     p->key_frame= 1;
 576
 577     if(avctx->pix_fmt != PIX_FMT_BGR24){
 578         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
 579         return -1;
 580     }
 581
 582     zret = deflateReset(&(c->zstream));
 583     if (zret != Z_OK) {
 584         av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
 585         return -1;
 586     }
 587     c->zstream.next_out = c->comp_buf;
 588     c->zstream.avail_out = c->max_comp_size;
 589
 590     for(i = avctx->height - 1; i >= 0; i--) {
 591         c->zstream.next_in = p->data[0]+p->linesize[0]*i;
 592         c->zstream.avail_in = avctx->width*3;
 593         zret = deflate(&(c->zstream), Z_NO_FLUSH);
 594         if (zret != Z_OK) {
 595             av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
 596             return -1;
 597         }
 598     }
 599     zret = deflate(&(c->zstream), Z_FINISH);
 600     if (zret != Z_STREAM_END) {
 601         av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
 602         return -1;
 603     }
 604
 605     for (i = 0; i < c->zstream.total_out; i++)
 606         put_bits(&c->pb, 8, c->comp_buf[i]);
 607     flush_put_bits(&c->pb);
 608
 609     return c->zstream.total_out;
 610 #endif
 611 }
 612
 613
 614
 615 /*
 616  *
 617  * Init lcl decoder
 618  *
 619  */
 620 static int decode_init(AVCodecContext *avctx)
 621 {
 622     LclContext * const c = (LclContext *)avctx->priv_data;
 623     unsigned int basesize = avctx->width * avctx->height;
 624     unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
 625     unsigned int max_decomp_size;
 626     int zret; // Zlib return code
 627
 628     c->avctx = avctx;
 629     avctx->has_b_frames = 0;
 630
 631     c->pic.data[0] = NULL;
 632
 633 #ifdef CONFIG_ZLIB
 634     // Needed if zlib unused or init aborted before inflateInit
 635     memset(&(c->zstream), 0, sizeof(z_stream));
 636 #endif
 637
 638     if (avctx->extradata_size < 8) {
 639         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
 640         return 1;
 641     }
 642
 643     // FIXME: find a better way to prevent integer overflow
 644     if (((unsigned int)avctx->width > 32000) || ((unsigned int)avctx->height > 32000)) {
 645         av_log(avctx, AV_LOG_ERROR, "Bad image size (w = %d, h = %d).\n", avctx->width, avctx->height);
 646         return 1;
 647     }
 648
 649     /* Check codec type */
 650     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
 651         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
 652         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
 653     }
 654
 655     /* Detect image type */
 656     switch (c->imgtype = *((char *)avctx->extradata + 4)) {
 657         case IMGTYPE_YUV111:
 658             c->decomp_size = basesize * 3;
 659             max_decomp_size = max_basesize * 3;
 660             av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
 661             break;
 662         case IMGTYPE_YUV422:
 663             c->decomp_size = basesize * 2;
 664             max_decomp_size = max_basesize * 2;
 665             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
 666             break;
 667         case IMGTYPE_RGB24:
 668             c->decomp_size = basesize * 3;
 669             max_decomp_size = max_basesize * 3;
 670             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
 671             break;
 672         case IMGTYPE_YUV411:
 673             c->decomp_size = basesize / 2 * 3;
 674             max_decomp_size = max_basesize / 2 * 3;
 675             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
 676             break;
 677         case IMGTYPE_YUV211:
 678             c->decomp_size = basesize * 2;
 679             max_decomp_size = max_basesize * 2;
 680             av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
 681             break;
 682         case IMGTYPE_YUV420:
 683             c->decomp_size = basesize / 2 * 3;
 684             max_decomp_size = max_basesize / 2 * 3;
 685             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
 686             break;
 687         default:
 688             av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
 689             return 1;
 690     }
 691
 692     /* Detect compression method */
 693     c->compression = *((char *)avctx->extradata + 5);
 694     switch (avctx->codec_id) {
 695         case CODEC_ID_MSZH:
 696             switch (c->compression) {
 697                 case COMP_MSZH:
 698                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
 699                     break;
 700                 case COMP_MSZH_NOCOMP:
 701                     c->decomp_size = 0;
 702                     av_log(avctx, AV_LOG_INFO, "No compression.\n");
 703                     break;
 704                 default:
 705                     av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
 706                     return 1;
 707             }
 708             break;
 709         case CODEC_ID_ZLIB:
 710 #ifdef CONFIG_ZLIB
 711             switch (c->compression) {
 712                 case COMP_ZLIB_HISPEED:
 713                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
 714                     break;
 715                 case COMP_ZLIB_HICOMP:
 716                     av_log(avctx, AV_LOG_INFO, "High compression.\n");
 717                     break;
 718                 case COMP_ZLIB_NORMAL:
 719                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
 720                     break;
 721                 default:
 722                     if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
 723                             av_log(avctx, AV_LOG_ERROR, "Unusupported compression level for ZLIB: (%d).\n", c->compression);
 724                         return 1;
 725                     }
 726                     av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
 727             }
 728 #else
 729             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 730             return 1;
 731 #endif
 732             break;
 733         default:
 734             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
 735             return 1;
 736     }
 737
 738     /* Allocate decompression buffer */
 739     if (c->decomp_size) {
 740         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
 741             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 742             return 1;
 743         }
 744     }
 745
 746     /* Detect flags */
 747     c->flags = *((char *)avctx->extradata + 6);
 748     if (c->flags & FLAG_MULTITHREAD)
 749         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
 750     if (c->flags & FLAG_NULLFRAME)
 751         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
 752     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
 753         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
 754     if (c->flags & FLAGMASK_UNUSED)
 755         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 756
 757     /* If needed init zlib */
 758     if (avctx->codec_id == CODEC_ID_ZLIB) {
 759 #ifdef CONFIG_ZLIB
 760         c->zstream.zalloc = Z_NULL;
 761         c->zstream.zfree = Z_NULL;
 762         c->zstream.opaque = Z_NULL;
 763         zret = inflateInit(&(c->zstream));
 764         if (zret != Z_OK) {
 765             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 766             return 1;
 767         }
 768 #else
 769     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 770     return 1;
 771 #endif
 772     }
 773
 774     avctx->pix_fmt = PIX_FMT_BGR24;
 775
 776     return 0;
 777 }
 778
 779
 780
 781 /*
 782  *
 783  * Init lcl encoder
 784  *
 785  */
 786 static int encode_init(AVCodecContext *avctx)
 787 {
 788     LclContext *c = avctx->priv_data;
 789     int zret; // Zlib return code
 790
 791 #ifndef CONFIG_ZLIB
 792     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 793     return 1;
 794 #else
 795
 796     c->avctx= avctx;
 797
 798     assert(avctx->width && avctx->height);
 799
 800     avctx->extradata= av_mallocz(8);
 801     avctx->coded_frame= &c->pic;
 802
 803     // Will be user settable someday
 804     c->compression = 6;
 805     c->flags = 0;
 806
 807     switch(avctx->pix_fmt){
 808         case PIX_FMT_BGR24:
 809             c->imgtype = IMGTYPE_RGB24;
 810             c->decomp_size = avctx->width * avctx->height * 3;
 811             avctx->bits_per_sample= 24;
 812             break;
 813         default:
 814             av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
 815             return -1;
 816     }
 817
 818     ((uint8_t*)avctx->extradata)[0]= 4;
 819     ((uint8_t*)avctx->extradata)[1]= 0;
 820     ((uint8_t*)avctx->extradata)[2]= 0;
 821     ((uint8_t*)avctx->extradata)[3]= 0;
 822     ((uint8_t*)avctx->extradata)[4]= c->imgtype;
 823     ((uint8_t*)avctx->extradata)[5]= c->compression;
 824     ((uint8_t*)avctx->extradata)[6]= c->flags;
 825     ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
 826     c->avctx->extradata_size= 8;
 827
 828     c->zstream.zalloc = Z_NULL;
 829     c->zstream.zfree = Z_NULL;
 830     c->zstream.opaque = Z_NULL;
 831     zret = deflateInit(&(c->zstream), c->compression);
 832     if (zret != Z_OK) {
 833         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
 834         return 1;
 835     }
 836
 837         /* Conservative upper bound taken from zlib v1.2.1 source */
 838         c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
 839                            ((c->decomp_size + 63) >> 6) + 11;
 840     if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
 841         av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
 842         return 1;
 843     }
 844
 845     return 0;
 846 #endif
 847 }
 848
 849
 850
 851
 852
 853 /*
 854  *
 855  * Uninit lcl decoder
 856  *
 857  */
 858 static int decode_end(AVCodecContext *avctx)
 859 {
 860         LclContext * const c = (LclContext *)avctx->priv_data;
 861
 862         if (c->pic.data[0])
 863                 avctx->release_buffer(avctx, &c->pic);
 864 #ifdef CONFIG_ZLIB
 865     inflateEnd(&(c->zstream));
 866 #endif
 867
 868         return 0;
 869 }
 870
 871
 872
 873 /*
 874  *
 875  * Uninit lcl encoder
 876  *
 877  */
 878 static int encode_end(AVCodecContext *avctx)
 879 {
 880     LclContext *c = avctx->priv_data;
 881
 882     av_freep(&avctx->extradata);
 883     av_freep(&c->comp_buf);
 884 #ifdef CONFIG_ZLIB
 885     deflateEnd(&(c->zstream));
 886 #endif
 887
 888     return 0;
 889 }
 890
 891 AVCodec mszh_decoder = {
 892         "mszh",
 893         CODEC_TYPE_VIDEO,
 894         CODEC_ID_MSZH,
 895         sizeof(LclContext),
 896         decode_init,
 897         NULL,
 898         decode_end,
 899         decode_frame,
 900         CODEC_CAP_DR1,
 901 };
 902
 903
 904 AVCodec zlib_decoder = {
 905         "zlib",
 906         CODEC_TYPE_VIDEO,
 907         CODEC_ID_ZLIB,
 908         sizeof(LclContext),
 909         decode_init,
 910         NULL,
 911         decode_end,
 912         decode_frame,
 913         CODEC_CAP_DR1,
 914 };
 915
 916 #ifdef CONFIG_ENCODERS
 917
 918 AVCodec zlib_encoder = {
 919     "zlib",
 920     CODEC_TYPE_VIDEO,
 921     CODEC_ID_ZLIB,
 922     sizeof(LclContext),
 923     encode_init,
 924     encode_frame,
 925     encode_end,
 926 //    .options = lcl_options,
 927 };
 928
 929 #endif //CONFIG_ENCODERS