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