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 /**
  24  * @file lcl.c
  25  * LCL (LossLess Codec Library) Video Codec
  26  * Decoder for MSZH and ZLIB codecs
  27  * Experimental encoder for ZLIB RGB24
  28  *
  29  * Fourcc: MSZH, ZLIB
  30  *
  31  * Original Win32 dll:
  32  * Ver2.23 By Kenji Oshima 2000.09.20
  33  * avimszh.dll, avizlib.dll
  34  *
  35  * A description of the decoding algorithm can be found here:
  36  *   http://www.pcisys.net/~melanson/codecs
  37  *
  38  * Supports: BGR24 (RGB 24bpp)
  39  *
  40  */
  41
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44
  45 #include "avcodec.h"
  46 #include "bitstream.h"
  47
  48 #ifdef CONFIG_ZLIB
  49 #include <zlib.h>
  50 #endif
  51
  52
  53 #define BMPTYPE_YUV 1
  54 #define BMPTYPE_RGB 2
  55
  56 #define IMGTYPE_YUV111 0
  57 #define IMGTYPE_YUV422 1
  58 #define IMGTYPE_RGB24 2
  59 #define IMGTYPE_YUV411 3
  60 #define IMGTYPE_YUV211 4
  61 #define IMGTYPE_YUV420 5
  62
  63 #define COMP_MSZH 0
  64 #define COMP_MSZH_NOCOMP 1
  65 #define COMP_ZLIB_HISPEED 1
  66 #define COMP_ZLIB_HICOMP 9
  67 #define COMP_ZLIB_NORMAL -1
  68
  69 #define FLAG_MULTITHREAD 1
  70 #define FLAG_NULLFRAME 2
  71 #define FLAG_PNGFILTER 4
  72 #define FLAGMASK_UNUSED 0xf8
  73
  74 #define CODEC_MSZH 1
  75 #define CODEC_ZLIB 3
  76
  77 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
  78 #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
  79
  80 /*
  81  * Decoder context
  82  */
  83 typedef struct LclContext {
  84
  85         AVCodecContext *avctx;
  86         AVFrame pic;
  87     PutBitContext pb;
  88
  89     // Image type
  90     int imgtype;
  91     // Compression type
  92     int compression;
  93     // Flags
  94     int flags;
  95     // Decompressed data size
  96     unsigned int decomp_size;
  97     // Decompression buffer
  98     unsigned char* decomp_buf;
  99     // Maximum compressed data size
 100     unsigned int max_comp_size;
 101     // Compression buffer
 102     unsigned char* comp_buf;
 103 #ifdef CONFIG_ZLIB
 104     z_stream zstream;
 105 #endif
 106 } LclContext;
 107
 108
 109 /*
 110  *
 111  * Helper functions
 112  *
 113  */
 114 static inline unsigned char fix (int pix14)
 115 {
 116     int tmp;
 117
 118     tmp = (pix14 + 0x80000) >> 20;
 119     if (tmp < 0)
 120         return 0;
 121     if (tmp > 255)
 122         return 255;
 123     return tmp;
 124 }
 125
 126
 127
 128 static inline unsigned char get_b (unsigned char yq, signed char bq)
 129 {
 130     return fix((yq << 20) + bq * 1858076);
 131 }
 132
 133
 134
 135 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
 136 {
 137     return fix((yq << 20) - bq * 360857 - rq * 748830);
 138 }
 139
 140
 141
 142 static inline unsigned char get_r (unsigned char yq, signed char rq)
 143 {
 144     return fix((yq << 20) + rq * 1470103);
 145 }
 146
 147
 148
 149 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
 150 {
 151     unsigned char *destptr_bak = destptr;
 152     unsigned char *destptr_end = destptr + destsize;
 153     unsigned char mask = 0;
 154     unsigned char maskbit = 0;
 155     unsigned int ofs, cnt;
 156
 157     while ((srclen > 0) && (destptr < destptr_end)) {
 158         if (maskbit == 0) {
 159             mask = *(srcptr++);
 160             maskbit = 8;
 161             srclen--;
 162             continue;
 163         }
 164         if ((mask & (1 << (--maskbit))) == 0) {
 165             if (destptr + 4 > destptr_end)
 166                 break;
 167             *(int*)destptr = *(int*)srcptr;
 168             srclen -= 4;
 169             destptr += 4;
 170             srcptr += 4;
 171         } else {
 172             ofs = *(srcptr++);
 173             cnt = *(srcptr++);
 174             ofs += cnt * 256;;
 175             cnt = ((cnt >> 3) & 0x1f) + 1;
 176             ofs &= 0x7ff;
 177             srclen -= 2;
 178             cnt *= 4;
 179             if (destptr + cnt > destptr_end) {
 180                 cnt =  destptr_end - destptr;
 181             }
 182             for (; cnt > 0; cnt--) {
 183                 *(destptr) = *(destptr - ofs);
 184                 destptr++;
 185             }
 186         }
 187     }
 188
 189     return (destptr - destptr_bak);
 190 }
 191
 192
 193
 194 #ifdef CONFIG_DECODERS
 195 /*
 196  *
 197  * Decode a frame
 198  *
 199  */
 200 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
 201 {
 202         LclContext * const c = avctx->priv_data;
 203         unsigned char *encoded = (unsigned char *)buf;
 204     unsigned int pixel_ptr;
 205     int row, col;
 206     unsigned char *outptr;
 207     unsigned int width = avctx->width; // Real image width
 208     unsigned int height = avctx->height; // Real image height
 209     unsigned int mszh_dlen;
 210     unsigned char yq, y1q, uq, vq;
 211     int uqvq;
 212     unsigned int mthread_inlen, mthread_outlen;
 213 #ifdef CONFIG_ZLIB
 214     int zret; // Zlib return code
 215 #endif
 216     unsigned int len = buf_size;
 217
 218         if(c->pic.data[0])
 219                 avctx->release_buffer(avctx, &c->pic);
 220
 221         c->pic.reference = 0;
 222         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
 223         if(avctx->get_buffer(avctx, &c->pic) < 0){
 224                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 225                 return -1;
 226         }
 227
 228     outptr = c->pic.data[0]; // Output image pointer
 229
 230     /* Decompress frame */
 231     switch (avctx->codec_id) {
 232         case CODEC_ID_MSZH:
 233             switch (c->compression) {
 234                 case COMP_MSZH:
 235                     if (c->flags & FLAG_MULTITHREAD) {
 236                         mthread_inlen = *((unsigned int*)encoded);
 237                         mthread_outlen = *((unsigned int*)(encoded+4));
 238                         if (mthread_outlen > c->decomp_size) // this should not happen
 239                             mthread_outlen = c->decomp_size;
 240                         mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
 241                         if (mthread_outlen != mszh_dlen) {
 242                             av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
 243                                    mthread_outlen, mszh_dlen);
 244                             return -1;
 245                         }
 246                         mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
 247                                                 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
 248                         if (mthread_outlen != mszh_dlen) {
 249                             av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
 250                                    mthread_outlen, mszh_dlen);
 251                             return -1;
 252                         }
 253                         encoded = c->decomp_buf;
 254                         len = c->decomp_size;
 255                     } else {
 256                         mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
 257                         if (c->decomp_size != mszh_dlen) {
 258                             av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
 259                                    c->decomp_size, mszh_dlen);
 260                             return -1;
 261                         }
 262                         encoded = c->decomp_buf;
 263                         len = mszh_dlen;
 264                     }
 265                     break;
 266                 case COMP_MSZH_NOCOMP:
 267                     break;
 268                 default:
 269                     av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
 270                     return -1;
 271             }
 272             break;
 273         case CODEC_ID_ZLIB:
 274 #ifdef CONFIG_ZLIB
 275             /* Using the original dll with normal compression (-1) and RGB format
 276              * gives a file with ZLIB fourcc, but frame is really uncompressed.
 277              * To be sure that's true check also frame size */
 278             if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
 279                (len == width * height * 3))
 280                 break;
 281             zret = inflateReset(&(c->zstream));
 282             if (zret != Z_OK) {
 283                 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
 284                 return -1;
 285             }
 286             if (c->flags & FLAG_MULTITHREAD) {
 287                 mthread_inlen = *((unsigned int*)encoded);
 288                 mthread_outlen = *((unsigned int*)(encoded+4));
 289                 if (mthread_outlen > c->decomp_size)
 290                     mthread_outlen = c->decomp_size;
 291                 c->zstream.next_in = encoded + 8;
 292                 c->zstream.avail_in = mthread_inlen;
 293                 c->zstream.next_out = c->decomp_buf;
 294                 c->zstream.avail_out = c->decomp_size;
 295                 zret = inflate(&(c->zstream), Z_FINISH);
 296                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 297                     av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
 298                     return -1;
 299                 }
 300                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 301                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
 302                            mthread_outlen, c->zstream.total_out);
 303                     return -1;
 304                 }
 305                 zret = inflateReset(&(c->zstream));
 306                 if (zret != Z_OK) {
 307                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
 308                     return -1;
 309                 }
 310                 c->zstream.next_in = encoded + 8 + mthread_inlen;
 311                 c->zstream.avail_in = len - mthread_inlen;
 312                 c->zstream.next_out = c->decomp_buf + mthread_outlen;
 313                 c->zstream.avail_out = c->decomp_size - mthread_outlen;
 314                 zret = inflate(&(c->zstream), Z_FINISH);
 315                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 316                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
 317                     return -1;
 318                 }
 319                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
 320                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
 321                            mthread_outlen, c->zstream.total_out);
 322                     return -1;
 323                 }
 324             } else {
 325                 c->zstream.next_in = encoded;
 326                 c->zstream.avail_in = len;
 327                 c->zstream.next_out = c->decomp_buf;
 328                 c->zstream.avail_out = c->decomp_size;
 329                 zret = inflate(&(c->zstream), Z_FINISH);
 330                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
 331                     av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
 332                     return -1;
 333                 }
 334                 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
 335                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
 336                            c->decomp_size, c->zstream.total_out);
 337                     return -1;
 338                 }
 339             }
 340             encoded = c->decomp_buf;
 341             len = c->decomp_size;;
 342 #else
 343             av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
 344             return -1;
 345 #endif
 346             break;
 347         default:
 348             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
 349             return -1;
 350     }
 351
 352
 353     /* Apply PNG filter */
 354     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
 355         switch (c->imgtype) {
 356             case IMGTYPE_YUV111:
 357             case IMGTYPE_RGB24:
 358                 for (row = 0; row < height; row++) {
 359                     pixel_ptr = row * width * 3;
 360                     yq = encoded[pixel_ptr++];
 361                     uqvq = AV_RL16(encoded+pixel_ptr);
 362                     pixel_ptr += 2;
 363                     for (col = 1; col < width; col++) {
 364                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 365                         uqvq -= AV_RL16(encoded+pixel_ptr+1);
 366                         AV_WL16(encoded+pixel_ptr+1, uqvq);
 367                         pixel_ptr += 3;
 368                     }
 369                 }
 370                 break;
 371             case IMGTYPE_YUV422:
 372                 for (row = 0; row < height; row++) {
 373                     pixel_ptr = row * width * 2;
 374                     yq = uq = vq =0;
 375                     for (col = 0; col < width/4; col++) {
 376                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 377                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 378                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 379                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 380                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 381                         encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
 382                         encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
 383                         encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
 384                         pixel_ptr += 8;
 385                     }
 386                 }
 387                 break;
 388             case IMGTYPE_YUV411:
 389                 for (row = 0; row < height; row++) {
 390                     pixel_ptr = row * width / 2 * 3;
 391                     yq = uq = vq =0;
 392                     for (col = 0; col < width/4; col++) {
 393                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 394                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 395                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
 396                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
 397                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 398                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 399                         pixel_ptr += 6;
 400                     }
 401                 }
 402                 break;
 403             case IMGTYPE_YUV211:
 404                 for (row = 0; row < height; row++) {
 405                     pixel_ptr = row * width * 2;
 406                     yq = uq = vq =0;
 407                     for (col = 0; col < width/2; col++) {
 408                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 409                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 410                         encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
 411                         encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
 412                         pixel_ptr += 4;
 413                     }
 414                 }
 415                 break;
 416             case IMGTYPE_YUV420:
 417                 for (row = 0; row < height/2; row++) {
 418                     pixel_ptr = row * width * 3;
 419                     yq = y1q = uq = vq =0;
 420                     for (col = 0; col < width/2; col++) {
 421                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 422                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
 423                         encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
 424                         encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
 425                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
 426                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
 427                         pixel_ptr += 6;
 428                     }
 429                 }
 430                 break;
 431             default:
 432                 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
 433                 return -1;
 434         }
 435     }
 436
 437     /* Convert colorspace */
 438     switch (c->imgtype) {
 439         case IMGTYPE_YUV111:
 440             for (row = height - 1; row >= 0; row--) {
 441                 pixel_ptr = row * c->pic.linesize[0];
 442                 for (col = 0; col < width; col++) {
 443                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
 444                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
 445                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
 446                     encoded += 3;
 447                 }
 448             }
 449             break;
 450         case IMGTYPE_YUV422:
 451             for (row = height - 1; row >= 0; row--) {
 452                 pixel_ptr = row * c->pic.linesize[0];
 453                 for (col = 0; col < width/4; col++) {
 454                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 455                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
 456                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
 457                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 458                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
 459                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
 460                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
 461                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
 462                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
 463                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
 464                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
 465                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
 466                     encoded += 8;
 467                 }
 468             }
 469             break;
 470         case IMGTYPE_RGB24:
 471             for (row = height - 1; row >= 0; row--) {
 472                 pixel_ptr = row * c->pic.linesize[0];
 473                 for (col = 0; col < width; col++) {
 474                     outptr[pixel_ptr++] = encoded[0];
 475                     outptr[pixel_ptr++] = encoded[1];
 476                     outptr[pixel_ptr++] = encoded[2];
 477                     encoded += 3;
 478                 }
 479             }
 480             break;
 481         case IMGTYPE_YUV411:
 482             for (row = height - 1; row >= 0; row--) {
 483                 pixel_ptr = row * c->pic.linesize[0];
 484                 for (col = 0; col < width/4; col++) {
 485                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
 486                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
 487                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
 488                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
 489                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
 490                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
 491                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
 492                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
 493                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
 494                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
 495                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
 496                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
 497                     encoded += 6;
 498                 }
 499             }
 500             break;
 501         case IMGTYPE_YUV211:
 502             for (row = height - 1; row >= 0; row--) {
 503                 pixel_ptr = row * c->pic.linesize[0];
 504                 for (col = 0; col < width/2; col++) {
 505                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
 506                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
 507                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
 508                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
 509                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
 510                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
 511                     encoded += 4;
 512                 }
 513             }
 514             break;
 515         case IMGTYPE_YUV420:
 516             for (row = height / 2 - 1; row >= 0; row--) {
 517                 pixel_ptr = 2 * row * c->pic.linesize[0];
 518                 for (col = 0; col < width/2; col++) {
 519                     outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
 520                     outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
 521                     outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
 522                     outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
 523                     outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
 524                     outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
 525                     outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
 526                     outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
 527                     outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
 528                     outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
 529                     outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
 530                     outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
 531                     pixel_ptr += 6;
 532                     encoded += 6;
 533                 }
 534             }
 535             break;
 536         default:
 537             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
 538             return -1;
 539     }
 540
 541     *data_size = sizeof(AVFrame);
 542     *(AVFrame*)data = c->pic;
 543
 544     /* always report that the buffer was completely consumed */
 545     return buf_size;
 546 }
 547 #endif
 548
 549 #ifdef CONFIG_ENCODERS
 550 /*
 551  *
 552  * Encode a frame
 553  *
 554  */
 555 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 556     LclContext *c = avctx->priv_data;
 557     AVFrame *pict = data;
 558     AVFrame * const p = &c->pic;
 559     int i;
 560     int zret; // Zlib return code
 561
 562 #ifndef CONFIG_ZLIB
 563     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
 564     return -1;
 565 #else
 566
 567     init_put_bits(&c->pb, buf, buf_size);
 568
 569     *p = *pict;
 570     p->pict_type= FF_I_TYPE;
 571     p->key_frame= 1;
 572
 573     if(avctx->pix_fmt != PIX_FMT_BGR24){
 574         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
 575         return -1;
 576     }
 577
 578     zret = deflateReset(&(c->zstream));
 579     if (zret != Z_OK) {
 580         av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
 581         return -1;
 582     }
 583     c->zstream.next_out = c->comp_buf;
 584     c->zstream.avail_out = c->max_comp_size;
 585
 586     for(i = avctx->height - 1; i >= 0; i--) {
 587         c->zstream.next_in = p->data[0]+p->linesize[0]*i;
 588         c->zstream.avail_in = avctx->width*3;
 589         zret = deflate(&(c->zstream), Z_NO_FLUSH);
 590         if (zret != Z_OK) {
 591             av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
 592             return -1;
 593         }
 594     }
 595     zret = deflate(&(c->zstream), Z_FINISH);
 596     if (zret != Z_STREAM_END) {
 597         av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
 598         return -1;
 599     }
 600
 601     for (i = 0; i < c->zstream.total_out; i++)
 602         put_bits(&c->pb, 8, c->comp_buf[i]);
 603     flush_put_bits(&c->pb);
 604
 605     return c->zstream.total_out;
 606 #endif
 607 }
 608 #endif /* CONFIG_ENCODERS */
 609
 610 #ifdef CONFIG_DECODERS
 611 /*
 612  *
 613  * Init lcl decoder
 614  *
 615  */
 616 static int decode_init(AVCodecContext *avctx)
 617 {
 618     LclContext * const c = avctx->priv_data;
 619     unsigned int basesize = avctx->width * avctx->height;
 620     unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
 621     unsigned int max_decomp_size;
 622     int zret; // Zlib return code
 623
 624     c->avctx = avctx;
 625
 626     c->pic.data[0] = NULL;
 627
 628 #ifdef CONFIG_ZLIB
 629     // Needed if zlib unused or init aborted before inflateInit
 630     memset(&(c->zstream), 0, sizeof(z_stream));
 631 #endif
 632
 633     if (avctx->extradata_size < 8) {
 634         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
 635         return 1;
 636     }
 637
 638     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 639         return 1;
 640     }
 641
 642     /* Check codec type */
 643     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
 644         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
 645         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
 646     }
 647
 648     /* Detect image type */
 649     switch (c->imgtype = *((char *)avctx->extradata + 4)) {
 650         case IMGTYPE_YUV111:
 651             c->decomp_size = basesize * 3;
 652             max_decomp_size = max_basesize * 3;
 653             av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
 654             break;
 655         case IMGTYPE_YUV422:
 656             c->decomp_size = basesize * 2;
 657             max_decomp_size = max_basesize * 2;
 658             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
 659             break;
 660         case IMGTYPE_RGB24:
 661             c->decomp_size = basesize * 3;
 662             max_decomp_size = max_basesize * 3;
 663             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
 664             break;
 665         case IMGTYPE_YUV411:
 666             c->decomp_size = basesize / 2 * 3;
 667             max_decomp_size = max_basesize / 2 * 3;
 668             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
 669             break;
 670         case IMGTYPE_YUV211:
 671             c->decomp_size = basesize * 2;
 672             max_decomp_size = max_basesize * 2;
 673             av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
 674             break;
 675         case IMGTYPE_YUV420:
 676             c->decomp_size = basesize / 2 * 3;
 677             max_decomp_size = max_basesize / 2 * 3;
 678             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
 679             break;
 680         default:
 681             av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
 682             return 1;
 683     }
 684
 685     /* Detect compression method */
 686     c->compression = *((char *)avctx->extradata + 5);
 687     switch (avctx->codec_id) {
 688         case CODEC_ID_MSZH:
 689             switch (c->compression) {
 690                 case COMP_MSZH:
 691                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
 692                     break;
 693                 case COMP_MSZH_NOCOMP:
 694                     c->decomp_size = 0;
 695                     av_log(avctx, AV_LOG_INFO, "No compression.\n");
 696                     break;
 697                 default:
 698                     av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
 699                     return 1;
 700             }
 701             break;
 702         case CODEC_ID_ZLIB:
 703 #ifdef CONFIG_ZLIB
 704             switch (c->compression) {
 705                 case COMP_ZLIB_HISPEED:
 706                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
 707                     break;
 708                 case COMP_ZLIB_HICOMP:
 709                     av_log(avctx, AV_LOG_INFO, "High compression.\n");
 710                     break;
 711                 case COMP_ZLIB_NORMAL:
 712                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
 713                     break;
 714                 default:
 715                     if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
 716                             av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
 717                         return 1;
 718                     }
 719                     av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
 720             }
 721 #else
 722             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 723             return 1;
 724 #endif
 725             break;
 726         default:
 727             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
 728             return 1;
 729     }
 730
 731     /* Allocate decompression buffer */
 732     if (c->decomp_size) {
 733         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
 734             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 735             return 1;
 736         }
 737     }
 738
 739     /* Detect flags */
 740     c->flags = *((char *)avctx->extradata + 6);
 741     if (c->flags & FLAG_MULTITHREAD)
 742         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
 743     if (c->flags & FLAG_NULLFRAME)
 744         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
 745     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
 746         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
 747     if (c->flags & FLAGMASK_UNUSED)
 748         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 749
 750     /* If needed init zlib */
 751     if (avctx->codec_id == CODEC_ID_ZLIB) {
 752 #ifdef CONFIG_ZLIB
 753         c->zstream.zalloc = Z_NULL;
 754         c->zstream.zfree = Z_NULL;
 755         c->zstream.opaque = Z_NULL;
 756         zret = inflateInit(&(c->zstream));
 757         if (zret != Z_OK) {
 758             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 759             return 1;
 760         }
 761 #else
 762     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 763     return 1;
 764 #endif
 765     }
 766
 767     avctx->pix_fmt = PIX_FMT_BGR24;
 768
 769     return 0;
 770 }
 771 #endif /* CONFIG_DECODERS */
 772
 773 #ifdef CONFIG_ENCODERS
 774 /*
 775  *
 776  * Init lcl encoder
 777  *
 778  */
 779 static int encode_init(AVCodecContext *avctx)
 780 {
 781     LclContext *c = avctx->priv_data;
 782     int zret; // Zlib return code
 783
 784 #ifndef CONFIG_ZLIB
 785     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 786     return 1;
 787 #else
 788
 789     c->avctx= avctx;
 790
 791     assert(avctx->width && avctx->height);
 792
 793     avctx->extradata= av_mallocz(8);
 794     avctx->coded_frame= &c->pic;
 795
 796     // Will be user settable someday
 797     c->compression = 6;
 798     c->flags = 0;
 799
 800     switch(avctx->pix_fmt){
 801         case PIX_FMT_BGR24:
 802             c->imgtype = IMGTYPE_RGB24;
 803             c->decomp_size = avctx->width * avctx->height * 3;
 804             avctx->bits_per_sample= 24;
 805             break;
 806         default:
 807             av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
 808             return -1;
 809     }
 810
 811     ((uint8_t*)avctx->extradata)[0]= 4;
 812     ((uint8_t*)avctx->extradata)[1]= 0;
 813     ((uint8_t*)avctx->extradata)[2]= 0;
 814     ((uint8_t*)avctx->extradata)[3]= 0;
 815     ((uint8_t*)avctx->extradata)[4]= c->imgtype;
 816     ((uint8_t*)avctx->extradata)[5]= c->compression;
 817     ((uint8_t*)avctx->extradata)[6]= c->flags;
 818     ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
 819     c->avctx->extradata_size= 8;
 820
 821     c->zstream.zalloc = Z_NULL;
 822     c->zstream.zfree = Z_NULL;
 823     c->zstream.opaque = Z_NULL;
 824     zret = deflateInit(&(c->zstream), c->compression);
 825     if (zret != Z_OK) {
 826         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
 827         return 1;
 828     }
 829
 830         /* Conservative upper bound taken from zlib v1.2.1 source */
 831         c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
 832                            ((c->decomp_size + 63) >> 6) + 11;
 833     if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
 834         av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
 835         return 1;
 836     }
 837
 838     return 0;
 839 #endif
 840 }
 841 #endif /* CONFIG_ENCODERS */
 842
 843
 844
 845 #ifdef CONFIG_DECODERS
 846 /*
 847  *
 848  * Uninit lcl decoder
 849  *
 850  */
 851 static int decode_end(AVCodecContext *avctx)
 852 {
 853         LclContext * const c = avctx->priv_data;
 854
 855         if (c->pic.data[0])
 856                 avctx->release_buffer(avctx, &c->pic);
 857 #ifdef CONFIG_ZLIB
 858     inflateEnd(&(c->zstream));
 859 #endif
 860
 861         return 0;
 862 }
 863 #endif
 864
 865 #ifdef CONFIG_ENCODERS
 866 /*
 867  *
 868  * Uninit lcl encoder
 869  *
 870  */
 871 static int encode_end(AVCodecContext *avctx)
 872 {
 873     LclContext *c = avctx->priv_data;
 874
 875     av_freep(&avctx->extradata);
 876     av_freep(&c->comp_buf);
 877 #ifdef CONFIG_ZLIB
 878     deflateEnd(&(c->zstream));
 879 #endif
 880
 881     return 0;
 882 }
 883 #endif
 884
 885 #ifdef CONFIG_MSZH_DECODER
 886 AVCodec mszh_decoder = {
 887         "mszh",
 888         CODEC_TYPE_VIDEO,
 889         CODEC_ID_MSZH,
 890         sizeof(LclContext),
 891         decode_init,
 892         NULL,
 893         decode_end,
 894         decode_frame,
 895         CODEC_CAP_DR1,
 896 };
 897 #endif
 898
 899 #ifdef CONFIG_ZLIB_DECODER
 900 AVCodec zlib_decoder = {
 901         "zlib",
 902         CODEC_TYPE_VIDEO,
 903         CODEC_ID_ZLIB,
 904         sizeof(LclContext),
 905         decode_init,
 906         NULL,
 907         decode_end,
 908         decode_frame,
 909         CODEC_CAP_DR1,
 910 };
 911 #endif
 912
 913 #ifdef CONFIG_ENCODERS
 914
 915 AVCodec zlib_encoder = {
 916     "zlib",
 917     CODEC_TYPE_VIDEO,
 918     CODEC_ID_ZLIB,
 919     sizeof(LclContext),
 920     encode_init,
 921     encode_frame,
 922     encode_end,
 923 };
 924
 925 #endif //CONFIG_ENCODERS