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 library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  *
  19  */
  20
  21 /**
  22  * @file lcl.c
  23  * LCL (LossLess Codec Library) Video Codec
  24  * Decoder for MSZH and ZLIB codecs
  25  * Experimental encoder for ZLIB RGB24
  26  *
  27  * Fourcc: MSZH, ZLIB
  28  *
  29  * Original Win32 dll:
  30  * Ver2.23 By Kenji Oshima 2000.09.20
  31  * avimszh.dll, avizlib.dll
  32  *
  33  * A description of the decoding algorithm can be found here:
  34  *   http://www.pcisys.net/~melanson/codecs
  35  *
  36  * Supports: BGR24 (RGB 24bpp)
  37  *
  38  */
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42
  43 #include "common.h"
  44 #include "bitstream.h"
  45 #include "avcodec.h"
  46
  47 #ifdef CONFIG_ZLIB
  48 #include <zlib.h>
  49 #endif
  50
  51
  52 #define BMPTYPE_YUV 1
  53 #define BMPTYPE_RGB 2
  54
  55 #define IMGTYPE_YUV111 0
  56 #define IMGTYPE_YUV422 1
  57 #define IMGTYPE_RGB24 2
  58 #define IMGTYPE_YUV411 3
  59 #define IMGTYPE_YUV211 4
  60 #define IMGTYPE_YUV420 5
  61
  62 #define COMP_MSZH 0
  63 #define COMP_MSZH_NOCOMP 1
  64 #define COMP_ZLIB_HISPEED 1
  65 #define COMP_ZLIB_HICOMP 9
  66 #define COMP_ZLIB_NORMAL -1
  67
  68 #define FLAG_MULTITHREAD 1
  69 #define FLAG_NULLFRAME 2
  70 #define FLAG_PNGFILTER 4
  71 #define FLAGMASK_UNUSED 0xf8
  72
  73 #define CODEC_MSZH 1
  74 #define CODEC_ZLIB 3
  75
  76 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
  77 #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
  78
  79 /*
  80  * Decoder context
  81  */
  82 typedef struct LclContext {
  83
  84         AVCodecContext *avctx;
  85         AVFrame pic;
  86     PutBitContext pb;
  87
  88     // Image type
  89     int imgtype;
  90     // Compression type
  91     int compression;
  92     // Flags
  93     int flags;
  94     // Decompressed data size
  95     unsigned int decomp_size;
  96     // Decompression buffer
  97     unsigned char* decomp_buf;
  98     // Maximum compressed data size
  99     unsigned int max_comp_size;
 100     // Compression buffer
 101     unsigned char* comp_buf;
 102 #ifdef CONFIG_ZLIB
 103     z_stream zstream;
 104 #endif
 105 } LclContext;
 106
 107
 108 /*
 109  *
 110  * Helper functions
 111  *
 112  */
 113 static inline unsigned char fix (int pix14)
 114 {
 115     int tmp;
 116
 117     tmp = (pix14 + 0x80000) >> 20;
 118     if (tmp < 0)
 119         return 0;
 120     if (tmp > 255)
 121         return 255;
 122     return tmp;
 123 }
 124
 125
 126
 127 static inline unsigned char get_b (unsigned char yq, signed char bq)
 128 {
 129     return fix((yq << 20) + bq * 1858076);
 130 }
 131
 132
 133
 134 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
 135 {
 136     return fix((yq << 20) - bq * 360857 - rq * 748830);
 137 }
 138
 139
 140
 141 static inline unsigned char get_r (unsigned char yq, signed char rq)
 142 {
 143     return fix((yq << 20) + rq * 1470103);
 144 }
 145
 146
 147
 148 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
 149 {
 150     unsigned char *destptr_bak = destptr;
 151     unsigned char *destptr_end = destptr + destsize;
 152     unsigned char mask = 0;
 153     unsigned char maskbit = 0;
 154     unsigned int ofs, cnt;
 155
 156     while ((srclen > 0) && (destptr < destptr_end)) {
 157         if (maskbit == 0) {
 158             mask = *(srcptr++);
 159             maskbit = 8;
 160             srclen--;
 161             continue;
 162         }
 163         if ((mask & (1 << (--maskbit))) == 0) {
 164             if (destptr + 4 > destptr_end)
 165                 break;
 166             *(int*)destptr = *(int*)srcptr;
 167             srclen -= 4;
 168             destptr += 4;
 169             srcptr += 4;
 170         } else {
 171             ofs = *(srcptr++);
 172             cnt = *(srcptr++);
 173             ofs += cnt * 256;;
 174             cnt = ((cnt >> 3) & 0x1f) + 1;
 175             ofs &= 0x7ff;
 176             srclen -= 2;
 177             cnt *= 4;
 178             if (destptr + cnt > destptr_end) {
 179                 cnt =  destptr_end - destptr;
 180             }
 181             for (; cnt > 0; cnt--) {
 182                 *(destptr) = *(destptr - ofs);
 183                 destptr++;
 184             }
 185         }
 186     }
 187
 188     return (destptr - destptr_bak);
 189 }
 190
 191
 192
 193
 194 /*
 195  *
 196  * Decode a frame
 197  *
 198  */
 199 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
 200 {
 201         LclContext * const c = (LclContext *)avctx->priv_data;
 202         unsigned char *encoded = (unsigned char *)buf;
 203     unsigned int pixel_ptr;
 204     int row, col;
 205     unsigned char *outptr;
 206     unsigned int width = avctx->width; // Real image width
 207     unsigned int height = avctx->height; // Real image height
 208     unsigned int mszh_dlen;
 209     unsigned char yq, y1q, uq, vq;
 210     int uqvq;
 211     unsigned int mthread_inlen, mthread_outlen;
 212 #ifdef CONFIG_ZLIB
 213     int zret; // Zlib return code
 214 #endif
 215     unsigned int len = buf_size;
 216
 217         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 = encoded[pixel_ptr++];
 361                     uqvq+=(encoded[pixel_ptr++] << 8);
 362                     for (col = 1; col < width; col++) {
 363                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
 364                         uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
 365                         encoded[pixel_ptr+1] = (uqvq) & 0xff;
 366                         encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
 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
 548
 549
 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
 609
 610
 611 /*
 612  *
 613  * Init lcl decoder
 614  *
 615  */
 616 static int decode_init(AVCodecContext *avctx)
 617 {
 618     LclContext * const c = (LclContext *)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     avctx->has_b_frames = 0;
 626
 627     c->pic.data[0] = NULL;
 628
 629 #ifdef CONFIG_ZLIB
 630     // Needed if zlib unused or init aborted before inflateInit
 631     memset(&(c->zstream), 0, sizeof(z_stream));
 632 #endif
 633
 634     if (avctx->extradata_size < 8) {
 635         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
 636         return 1;
 637     }
 638
 639     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
 640         return 1;
 641     }
 642
 643     /* Check codec type */
 644     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
 645         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
 646         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
 647     }
 648
 649     /* Detect image type */
 650     switch (c->imgtype = *((char *)avctx->extradata + 4)) {
 651         case IMGTYPE_YUV111:
 652             c->decomp_size = basesize * 3;
 653             max_decomp_size = max_basesize * 3;
 654             av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
 655             break;
 656         case IMGTYPE_YUV422:
 657             c->decomp_size = basesize * 2;
 658             max_decomp_size = max_basesize * 2;
 659             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
 660             break;
 661         case IMGTYPE_RGB24:
 662             c->decomp_size = basesize * 3;
 663             max_decomp_size = max_basesize * 3;
 664             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
 665             break;
 666         case IMGTYPE_YUV411:
 667             c->decomp_size = basesize / 2 * 3;
 668             max_decomp_size = max_basesize / 2 * 3;
 669             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
 670             break;
 671         case IMGTYPE_YUV211:
 672             c->decomp_size = basesize * 2;
 673             max_decomp_size = max_basesize * 2;
 674             av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
 675             break;
 676         case IMGTYPE_YUV420:
 677             c->decomp_size = basesize / 2 * 3;
 678             max_decomp_size = max_basesize / 2 * 3;
 679             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
 680             break;
 681         default:
 682             av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
 683             return 1;
 684     }
 685
 686     /* Detect compression method */
 687     c->compression = *((char *)avctx->extradata + 5);
 688     switch (avctx->codec_id) {
 689         case CODEC_ID_MSZH:
 690             switch (c->compression) {
 691                 case COMP_MSZH:
 692                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
 693                     break;
 694                 case COMP_MSZH_NOCOMP:
 695                     c->decomp_size = 0;
 696                     av_log(avctx, AV_LOG_INFO, "No compression.\n");
 697                     break;
 698                 default:
 699                     av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
 700                     return 1;
 701             }
 702             break;
 703         case CODEC_ID_ZLIB:
 704 #ifdef CONFIG_ZLIB
 705             switch (c->compression) {
 706                 case COMP_ZLIB_HISPEED:
 707                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
 708                     break;
 709                 case COMP_ZLIB_HICOMP:
 710                     av_log(avctx, AV_LOG_INFO, "High compression.\n");
 711                     break;
 712                 case COMP_ZLIB_NORMAL:
 713                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
 714                     break;
 715                 default:
 716                     if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
 717                             av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
 718                         return 1;
 719                     }
 720                     av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
 721             }
 722 #else
 723             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 724             return 1;
 725 #endif
 726             break;
 727         default:
 728             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
 729             return 1;
 730     }
 731
 732     /* Allocate decompression buffer */
 733     if (c->decomp_size) {
 734         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
 735             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 736             return 1;
 737         }
 738     }
 739
 740     /* Detect flags */
 741     c->flags = *((char *)avctx->extradata + 6);
 742     if (c->flags & FLAG_MULTITHREAD)
 743         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
 744     if (c->flags & FLAG_NULLFRAME)
 745         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
 746     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
 747         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
 748     if (c->flags & FLAGMASK_UNUSED)
 749         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
 750
 751     /* If needed init zlib */
 752     if (avctx->codec_id == CODEC_ID_ZLIB) {
 753 #ifdef CONFIG_ZLIB
 754         c->zstream.zalloc = Z_NULL;
 755         c->zstream.zfree = Z_NULL;
 756         c->zstream.opaque = Z_NULL;
 757         zret = inflateInit(&(c->zstream));
 758         if (zret != Z_OK) {
 759             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
 760             return 1;
 761         }
 762 #else
 763     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 764     return 1;
 765 #endif
 766     }
 767
 768     avctx->pix_fmt = PIX_FMT_BGR24;
 769
 770     return 0;
 771 }
 772
 773
 774
 775 /*
 776  *
 777  * Init lcl encoder
 778  *
 779  */
 780 static int encode_init(AVCodecContext *avctx)
 781 {
 782     LclContext *c = avctx->priv_data;
 783     int zret; // Zlib return code
 784
 785 #ifndef CONFIG_ZLIB
 786     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
 787     return 1;
 788 #else
 789
 790     c->avctx= avctx;
 791
 792     assert(avctx->width && avctx->height);
 793
 794     avctx->extradata= av_mallocz(8);
 795     avctx->coded_frame= &c->pic;
 796
 797     // Will be user settable someday
 798     c->compression = 6;
 799     c->flags = 0;
 800
 801     switch(avctx->pix_fmt){
 802         case PIX_FMT_BGR24:
 803             c->imgtype = IMGTYPE_RGB24;
 804             c->decomp_size = avctx->width * avctx->height * 3;
 805             avctx->bits_per_sample= 24;
 806             break;
 807         default:
 808             av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
 809             return -1;
 810     }
 811
 812     ((uint8_t*)avctx->extradata)[0]= 4;
 813     ((uint8_t*)avctx->extradata)[1]= 0;
 814     ((uint8_t*)avctx->extradata)[2]= 0;
 815     ((uint8_t*)avctx->extradata)[3]= 0;
 816     ((uint8_t*)avctx->extradata)[4]= c->imgtype;
 817     ((uint8_t*)avctx->extradata)[5]= c->compression;
 818     ((uint8_t*)avctx->extradata)[6]= c->flags;
 819     ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
 820     c->avctx->extradata_size= 8;
 821
 822     c->zstream.zalloc = Z_NULL;
 823     c->zstream.zfree = Z_NULL;
 824     c->zstream.opaque = Z_NULL;
 825     zret = deflateInit(&(c->zstream), c->compression);
 826     if (zret != Z_OK) {
 827         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
 828         return 1;
 829     }
 830
 831         /* Conservative upper bound taken from zlib v1.2.1 source */
 832         c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
 833                            ((c->decomp_size + 63) >> 6) + 11;
 834     if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
 835         av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
 836         return 1;
 837     }
 838
 839     return 0;
 840 #endif
 841 }
 842
 843
 844
 845
 846
 847 /*
 848  *
 849  * Uninit lcl decoder
 850  *
 851  */
 852 static int decode_end(AVCodecContext *avctx)
 853 {
 854         LclContext * const c = (LclContext *)avctx->priv_data;
 855
 856         if (c->pic.data[0])
 857                 avctx->release_buffer(avctx, &c->pic);
 858 #ifdef CONFIG_ZLIB
 859     inflateEnd(&(c->zstream));
 860 #endif
 861
 862         return 0;
 863 }
 864
 865
 866
 867 /*
 868  *
 869  * Uninit lcl encoder
 870  *
 871  */
 872 static int encode_end(AVCodecContext *avctx)
 873 {
 874     LclContext *c = avctx->priv_data;
 875
 876     av_freep(&avctx->extradata);
 877     av_freep(&c->comp_buf);
 878 #ifdef CONFIG_ZLIB
 879     deflateEnd(&(c->zstream));
 880 #endif
 881
 882     return 0;
 883 }
 884
 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
 897
 898 AVCodec zlib_decoder = {
 899         "zlib",
 900         CODEC_TYPE_VIDEO,
 901         CODEC_ID_ZLIB,
 902         sizeof(LclContext),
 903         decode_init,
 904         NULL,
 905         decode_end,
 906         decode_frame,
 907         CODEC_CAP_DR1,
 908 };
 909
 910 #ifdef CONFIG_ENCODERS
 911
 912 AVCodec zlib_encoder = {
 913     "zlib",
 914     CODEC_TYPE_VIDEO,
 915     CODEC_ID_ZLIB,
 916     sizeof(LclContext),
 917     encode_init,
 918     encode_frame,
 919     encode_end,
 920 };
 921
 922 #endif //CONFIG_ENCODERS