git.sesse.net Git - ffmpeg/blob - libavcodec/lcl.c

   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 lcl.c
  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 "bitstream.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 #ifdef CONFIG_DECODERS
 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 = 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         if(c->pic.data[0])
 218                 avctx->release_buffer(avctx, &c->pic);
 219
 220         c->pic.reference = 0;
 221         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
 222         if(avctx->get_buffer(avctx, &c->pic) < 0){
 223                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 224                 return -1;
 225         }
 226
 227     outptr = c->pic.data[0]; // Output image pointer
 228
 229     /* Decompress frame */
 230     switch (avctx->codec_id) {
 231         case CODEC_ID_MSZH:
 232             switch (c->compression) {
 233                 case COMP_MSZH:
 234                     if (c->flags & FLAG_MULTITHREAD) {
 235                         mthread_inlen = *((unsigned int*)encoded);
 236                         mthread_outlen = *((unsigned int*)(encoded+4));
 237                         if (mthread_outlen > c->decomp_size) // this should not happen
 238                             mthread_outlen = c->decomp_size;
 239                         mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
 240                         if (mthread_outlen != mszh_dlen) {
 241                             av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
 242                                    mthread_outlen, mszh_dlen);
 243                             return -1;
 244                         }
 245                         mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
 246                                                 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
 247                         if (mthread_outlen != mszh_dlen) {
 248                             av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
 249                                    mthread_outlen, mszh_dlen);
 250                             return -1;
 251                         }
 252                         encoded = c->decomp_buf;
 253                         len = c->decomp_size;
 254                     } else {
 255                         mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
 256                         if (c->decomp_size != mszh_dlen) {
 257                             av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
 258                                    c->decomp_size, mszh_dlen);
 259                             return -1;
 260                         }
 261                         encoded = c->decomp_buf;
 262                         len = mszh_dlen;
 263                     }
 264                     break;
 265                 case COMP_MSZH_NOCOMP:
 266                     break;
 267                 default:
 268                     av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
 269                     return -1;
 270             }
 271             break;
 272         case CODEC_ID_ZLIB:
 273 #ifdef CONFIG_ZLIB
 274             /* Using the original dll with normal compression (-1) and RGB format
 275              * gives a file with ZLIB fourcc, but frame is really uncompressed.
 276              * To be sure that's true check also frame size */
 277             if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
 278                (len == width * height * 3))
 279                 break;
 280             zret = inflateReset(&(c->zstream));
 281             if (zret != Z_OK) {
 282                 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 283                 return -1;
 284             }
 285             if (c->flags & FLAG_MULTITHREAD) {
 286                 mthread_inlen = *((unsigned int*)encoded);
 287                 mthread_outlen = *((unsigned int*)(encoded+4));
 288                 if (mthread_outlen > c->decomp_size)
 289                     mthread_outlen = c->decomp_size;
 290                 c->zstream.next_in = encoded + 8;
 291                 c->zstream.avail_in = mthread_inlen;
 292                 c->zstream.next_out = c->decomp_buf;
 293                 c->zstream.avail_out = c->decomp_size;
 294                 zret = inflate(&(c->zstream), Z_FINISH);
 295                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 296                     av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
 297                     return -1;
 298                 }
 299                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 300                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
 301                            mthread_outlen, c->zstream.total_out);
 302                     return -1;
 303                 }
 304                 zret = inflateReset(&(c->zstream));
 305                 if (zret != Z_OK) {
 306                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
 307                     return -1;
 308                 }
 309                 c->zstream.next_in = encoded + 8 + mthread_inlen;
 310                 c->zstream.avail_in = len - mthread_inlen;
 311                 c->zstream.next_out = c->decomp_buf + mthread_outlen;
 312                 c->zstream.avail_out = c->decomp_size - mthread_outlen;
 313                 zret = inflate(&(c->zstream), Z_FINISH);
 314                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 315                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
 316                     return -1;
 317                 }
 318                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 319                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
 320                            mthread_outlen, c->zstream.total_out);
 321                     return -1;
 322                 }
 323             } else {
 324                 c->zstream.next_in = encoded;
 325                 c->zstream.avail_in = len;
 326                 c->zstream.next_out = c->decomp_buf;
 327                 c->zstream.avail_out = c->decomp_size;
 328                 zret = inflate(&(c->zstream), Z_FINISH);
 329                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 330                     av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
 331                     return -1;
 332                 }
 333                 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
 334                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
 335                            c->decomp_size, c->zstream.total_out);
 336                     return -1;
 337                 }
 338             }
 339             encoded = c->decomp_buf;
 340             len = c->decomp_size;;
 341 #else
 342             av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
 343             return -1;
 344 #endif
 345             break;
 346         default:
 347             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
 348             return -1;
 349     }
 350
 351
 352     /* Apply PNG filter */
 353     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
 354         switch (c->imgtype) {
 355             case IMGTYPE_YUV111:
 356             case IMGTYPE_RGB24:
 357                 for (row = 0; row < height; row++) {
 358                     pixel_ptr = row * width * 3;
 359                     yq = encoded[pixel_ptr++];
 360                     uqvq = AV_RL16(encoded+pixel_ptr);
 361                     pixel_ptr += 2;
 362                     for (col = 1; col < width; col++) {
 363                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 364                         uqvq -= AV_RL16(encoded+pixel_ptr+1);
 365                         AV_WL16(encoded+pixel_ptr+1, uqvq);
 366                         pixel_ptr += 3;
 367                     }
 368                 }
 369                 break;
 370             case IMGTYPE_YUV422:
 371                 for (row = 0; row < height; row++) {
 372                     pixel_ptr = row * width * 2;
 373                     yq = uq = vq =0;
 374                     for (col = 0; col < width/4; col++) {
 375                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 376                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 377                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 378                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 379                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 380                         encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
 381                         encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
 382                         encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
 383                         pixel_ptr += 8;
 384                     }
 385                 }
 386                 break;
 387             case IMGTYPE_YUV411:
 388                 for (row = 0; row < height; row++) {
 389                     pixel_ptr = row * width / 2 * 3;
 390                     yq = uq = vq =0;
 391                     for (col = 0; col < width/4; col++) {
 392                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 393                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 394                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 395                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 396                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 397                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 398                         pixel_ptr += 6;
 399                     }
 400                 }
 401                 break;
 402             case IMGTYPE_YUV211:
 403                 for (row = 0; row < height; row++) {
 404                     pixel_ptr = row * width * 2;
 405                     yq = uq = vq =0;
 406                     for (col = 0; col < width/2; col++) {
 407                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 408                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 409                         encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
 410                         encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
 411                         pixel_ptr += 4;
 412                     }
 413                 }
 414                 break;
 415             case IMGTYPE_YUV420:
 416                 for (row = 0; row < height/2; row++) {
 417                     pixel_ptr = row * width * 3;
 418                     yq = y1q = uq = vq =0;
 419                     for (col = 0; col < width/2; col++) {
 420                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 421                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 422                         encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
 423                         encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
 424                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 425                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 426                         pixel_ptr += 6;
 427                     }
 428                 }
 429                 break;
 430             default:
 431                 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
 432                 return -1;
 433         }
 434     }
 435
 436     /* Convert colorspace */
 437     switch (c->imgtype) {
 438         case IMGTYPE_YUV111:
 439             for (row = height - 1; row >= 0; row--) {
 440                 pixel_ptr = row * c->pic.linesize[0];
 441                 for (col = 0; col < width; col++) {
 442                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
 443                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
 444                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
 445                     encoded += 3;
 446                 }
 447             }
 448             break;
 449         case IMGTYPE_YUV422:
 450             for (row = height - 1; row >= 0; row--) {
 451                 pixel_ptr = row * c->pic.linesize[0];
 452                 for (col = 0; col < width/4; col++) {
 453                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 454                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
 455                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
 456                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 457                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
 458                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
 459                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
 460                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
 461                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
 462                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
 463                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
 464                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
 465                     encoded += 8;
 466                 }
 467             }
 468             break;
 469         case IMGTYPE_RGB24:
 470             for (row = height - 1; row >= 0; row--) {
 471                 pixel_ptr = row * c->pic.linesize[0];
 472                 for (col = 0; col < width; col++) {
 473                     outptr[pixel_ptr++] = encoded[0];
 474                     outptr[pixel_ptr++] = encoded[1];
 475                     outptr[pixel_ptr++] = encoded[2];
 476                     encoded += 3;
 477                 }
 478             }
 479             break;
 480         case IMGTYPE_YUV411:
 481             for (row = height - 1; row >= 0; row--) {
 482                 pixel_ptr = row * c->pic.linesize[0];
 483                 for (col = 0; col < width/4; col++) {
 484                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 485                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
 486                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
 487                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 488                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
 489                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
 490                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
 491                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
 492                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
 493                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
 494                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
 495                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
 496                     encoded += 6;
 497                 }
 498             }
 499             break;
 500         case IMGTYPE_YUV211:
 501             for (row = height - 1; row >= 0; row--) {
 502                 pixel_ptr = row * c->pic.linesize[0];
 503                 for (col = 0; col < width/2; col++) {
 504                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
 505                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
 506                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
 507                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
 508                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
 509                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
 510                     encoded += 4;
 511                 }
 512             }
 513             break;
 514         case IMGTYPE_YUV420:
 515             for (row = height / 2 - 1; row >= 0; row--) {
 516                 pixel_ptr = 2 * row * c->pic.linesize[0];
 517                 for (col = 0; col < width/2; col++) {
 518                     outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
 519                     outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
 520                     outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
 521                     outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
 522                     outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
 523                     outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
 524                     outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
 525                     outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
 526                     outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
 527                     outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
 528                     outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
 529                     outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
 530                     pixel_ptr += 6;
 531                     encoded += 6;
 532                 }
 533             }
 534             break;
 535         default:
 536             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
 537             return -1;
 538     }
 539
 540     *data_size = sizeof(AVFrame);
 541     *(AVFrame*)data = c->pic;
 542
 543     /* always report that the buffer was completely consumed */
 544     return buf_size;
 545 }
 546 #endif
 547
 548 #ifdef CONFIG_ENCODERS
 549 /*
 550  *
 551  * Encode a frame
 552  *
 553  */
 554 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 555     LclContext *c = avctx->priv_data;
 556     AVFrame *pict = data;
 557     AVFrame * const p = &c->pic;
 558     int i;
 559     int zret; // Zlib return code
 560
 561 #ifndef CONFIG_ZLIB
 562     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
 563     return -1;
 564 #else
 565
 566     init_put_bits(&c->pb, buf, buf_size);
 567
 568     *p = *pict;
 569     p->pict_type= FF_I_TYPE;
 570     p->key_frame= 1;
 571
 572     if(avctx->pix_fmt != PIX_FMT_BGR24){
 573         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
 574         return -1;
 575     }
 576
 577     zret = deflateReset(&(c->zstream));
 578     if (zret != Z_OK) {
 579         av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
 580         return -1;
 581     }
 582     c->zstream.next_out = c->comp_buf;
 583     c->zstream.avail_out = c->max_comp_size;
 584
 585     for(i = avctx->height - 1; i >= 0; i--) {
 586         c->zstream.next_in = p->data[0]+p->linesize[0]*i;
 587         c->zstream.avail_in = avctx->width*3;
 588         zret = deflate(&(c->zstream), Z_NO_FLUSH);
 589         if (zret != Z_OK) {
 590             av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
 591             return -1;
 592         }
 593     }
 594     zret = deflate(&(c->zstream), Z_FINISH);
 595     if (zret != Z_STREAM_END) {
 596         av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
 597         return -1;
 598     }
 599
 600     for (i = 0; i < c->zstream.total_out; i++)
 601         put_bits(&c->pb, 8, c->comp_buf[i]);
 602     flush_put_bits(&c->pb);
 603
 604     return c->zstream.total_out;
 605 #endif
 606 }
 607 #endif /* CONFIG_ENCODERS */
 608
 609 #ifdef CONFIG_DECODERS
 610 /*
 611  *
 612  * Init lcl decoder
 613  *
 614  */
 615 static int decode_init(AVCodecContext *avctx)
 616 {
 617     LclContext * const c = avctx->priv_data;
 618     unsigned int basesize = avctx->width * avctx->height;
 619     unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
 620     unsigned int max_decomp_size;
 621     int zret; // Zlib return code
 622
 623     c->avctx = avctx;
 624
 625     c->pic.data[0] = NULL;
 626
 627 #ifdef CONFIG_ZLIB
 628     // Needed if zlib unused or init aborted before inflateInit
 629     memset(&(c->zstream), 0, sizeof(z_stream));
 630 #endif
 631
 632     if (avctx->extradata_size < 8) {
 633         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
 634         return 1;
 635     }
 636
 637     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 638         return 1;
 639     }
 640
 641     /* Check codec type */
 642     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
 643         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
 644         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
 645     }
 646
 647     /* Detect image type */
 648     switch (c->imgtype = *((char *)avctx->extradata + 4)) {
 649         case IMGTYPE_YUV111:
 650             c->decomp_size = basesize * 3;
 651             max_decomp_size = max_basesize * 3;
 652             av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
 653             break;
 654         case IMGTYPE_YUV422:
 655             c->decomp_size = basesize * 2;
 656             max_decomp_size = max_basesize * 2;
 657             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
 658             break;
 659         case IMGTYPE_RGB24:
 660             c->decomp_size = basesize * 3;
 661             max_decomp_size = max_basesize * 3;
 662             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
 663             break;
 664         case IMGTYPE_YUV411:
 665             c->decomp_size = basesize / 2 * 3;
 666             max_decomp_size = max_basesize / 2 * 3;
 667             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
 668             break;
 669         case IMGTYPE_YUV211:
 670             c->decomp_size = basesize * 2;
 671             max_decomp_size = max_basesize * 2;
 672             av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
 673             break;
 674         case IMGTYPE_YUV420:
 675             c->decomp_size = basesize / 2 * 3;
 676             max_decomp_size = max_basesize / 2 * 3;
 677             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
 678             break;
 679         default:
 680             av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
 681             return 1;
 682     }
 683
 684     /* Detect compression method */
 685     c->compression = *((char *)avctx->extradata + 5);
 686     switch (avctx->codec_id) {
 687         case CODEC_ID_MSZH:
 688             switch (c->compression) {
 689                 case COMP_MSZH:
 690                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
 691                     break;
 692                 case COMP_MSZH_NOCOMP:
 693                     c->decomp_size = 0;
 694                     av_log(avctx, AV_LOG_INFO, "No compression.\n");
 695                     break;
 696                 default:
 697                     av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
 698                     return 1;
 699             }
 700             break;
 701         case CODEC_ID_ZLIB:
 702 #ifdef CONFIG_ZLIB
 703             switch (c->compression) {
 704                 case COMP_ZLIB_HISPEED:
 705                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
 706                     break;
 707                 case COMP_ZLIB_HICOMP:
 708                     av_log(avctx, AV_LOG_INFO, "High compression.\n");
 709                     break;
 710                 case COMP_ZLIB_NORMAL:
 711                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
 712                     break;
 713                 default:
 714                     if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
 715                             av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
 716                         return 1;
 717                     }
 718                     av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
 719             }
 720 #else
 721             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 722             return 1;
 723 #endif
 724             break;
 725         default:
 726             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
 727             return 1;
 728     }
 729
 730     /* Allocate decompression buffer */
 731     if (c->decomp_size) {
 732         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
 733             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 734             return 1;
 735         }
 736     }
 737
 738     /* Detect flags */
 739     c->flags = *((char *)avctx->extradata + 6);
 740     if (c->flags & FLAG_MULTITHREAD)
 741         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
 742     if (c->flags & FLAG_NULLFRAME)
 743         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
 744     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
 745         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
 746     if (c->flags & FLAGMASK_UNUSED)
 747         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 748
 749     /* If needed init zlib */
 750     if (avctx->codec_id == CODEC_ID_ZLIB) {
 751 #ifdef CONFIG_ZLIB
 752         c->zstream.zalloc = Z_NULL;
 753         c->zstream.zfree = Z_NULL;
 754         c->zstream.opaque = Z_NULL;
 755         zret = inflateInit(&(c->zstream));
 756         if (zret != Z_OK) {
 757             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 758             return 1;
 759         }
 760 #else
 761     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 762     return 1;
 763 #endif
 764     }
 765
 766     avctx->pix_fmt = PIX_FMT_BGR24;
 767
 768     return 0;
 769 }
 770 #endif /* CONFIG_DECODERS */
 771
 772 #ifdef CONFIG_ENCODERS
 773 /*
 774  *
 775  * Init lcl encoder
 776  *
 777  */
 778 static int encode_init(AVCodecContext *avctx)
 779 {
 780     LclContext *c = avctx->priv_data;
 781     int zret; // Zlib return code
 782
 783 #ifndef CONFIG_ZLIB
 784     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 785     return 1;
 786 #else
 787
 788     c->avctx= avctx;
 789
 790     assert(avctx->width && avctx->height);
 791
 792     avctx->extradata= av_mallocz(8);
 793     avctx->coded_frame= &c->pic;
 794
 795     // Will be user settable someday
 796     c->compression = 6;
 797     c->flags = 0;
 798
 799     switch(avctx->pix_fmt){
 800         case PIX_FMT_BGR24:
 801             c->imgtype = IMGTYPE_RGB24;
 802             c->decomp_size = avctx->width * avctx->height * 3;
 803             avctx->bits_per_sample= 24;
 804             break;
 805         default:
 806             av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
 807             return -1;
 808     }
 809
 810     ((uint8_t*)avctx->extradata)[0]= 4;
 811     ((uint8_t*)avctx->extradata)[1]= 0;
 812     ((uint8_t*)avctx->extradata)[2]= 0;
 813     ((uint8_t*)avctx->extradata)[3]= 0;
 814     ((uint8_t*)avctx->extradata)[4]= c->imgtype;
 815     ((uint8_t*)avctx->extradata)[5]= c->compression;
 816     ((uint8_t*)avctx->extradata)[6]= c->flags;
 817     ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
 818     c->avctx->extradata_size= 8;
 819
 820     c->zstream.zalloc = Z_NULL;
 821     c->zstream.zfree = Z_NULL;
 822     c->zstream.opaque = Z_NULL;
 823     zret = deflateInit(&(c->zstream), c->compression);
 824     if (zret != Z_OK) {
 825         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
 826         return 1;
 827     }
 828
 829         /* Conservative upper bound taken from zlib v1.2.1 source */
 830         c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
 831                            ((c->decomp_size + 63) >> 6) + 11;
 832     if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
 833         av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
 834         return 1;
 835     }
 836
 837     return 0;
 838 #endif
 839 }
 840 #endif /* CONFIG_ENCODERS */
 841
 842
 843
 844 #ifdef CONFIG_DECODERS
 845 /*
 846  *
 847  * Uninit lcl decoder
 848  *
 849  */
 850 static int decode_end(AVCodecContext *avctx)
 851 {
 852         LclContext * const c = avctx->priv_data;
 853
 854         if (c->pic.data[0])
 855                 avctx->release_buffer(avctx, &c->pic);
 856 #ifdef CONFIG_ZLIB
 857     inflateEnd(&(c->zstream));
 858 #endif
 859
 860         return 0;
 861 }
 862 #endif
 863
 864 #ifdef CONFIG_ENCODERS
 865 /*
 866  *
 867  * Uninit lcl encoder
 868  *
 869  */
 870 static int encode_end(AVCodecContext *avctx)
 871 {
 872     LclContext *c = avctx->priv_data;
 873
 874     av_freep(&avctx->extradata);
 875     av_freep(&c->comp_buf);
 876 #ifdef CONFIG_ZLIB
 877     deflateEnd(&(c->zstream));
 878 #endif
 879
 880     return 0;
 881 }
 882 #endif
 883
 884 #ifdef CONFIG_MSZH_DECODER
 885 AVCodec mszh_decoder = {
 886         "mszh",
 887         CODEC_TYPE_VIDEO,
 888         CODEC_ID_MSZH,
 889         sizeof(LclContext),
 890         decode_init,
 891         NULL,
 892         decode_end,
 893         decode_frame,
 894         CODEC_CAP_DR1,
 895 };
 896 #endif
 897
 898 #ifdef CONFIG_ZLIB_DECODER
 899 AVCodec zlib_decoder = {
 900         "zlib",
 901         CODEC_TYPE_VIDEO,
 902         CODEC_ID_ZLIB,
 903         sizeof(LclContext),
 904         decode_init,
 905         NULL,
 906         decode_end,
 907         decode_frame,
 908         CODEC_CAP_DR1,
 909 };
 910 #endif
 911
 912 #ifdef CONFIG_ENCODERS
 913
 914 AVCodec zlib_encoder = {
 915     "zlib",
 916     CODEC_TYPE_VIDEO,
 917     CODEC_ID_ZLIB,
 918     sizeof(LclContext),
 919     encode_init,
 920     encode_frame,
 921     encode_end,
 922 };
 923
 924 #endif //CONFIG_ENCODERS