7e144eb6b8cdb7098e6730da390f9047a237aa9b
[ffmpeg.git] / libavcodec / lcldec.c
1 /*
2  * LCL (LossLess Codec Library) Codec
3  * Copyright (c) 2002-2004 Roberto Togni
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file lcl.c
24  * LCL (LossLess Codec Library) Video Codec
25  * Decoder for MSZH and ZLIB codecs
26  * Experimental encoder for ZLIB RGB24
27  *
28  * Fourcc: MSZH, ZLIB
29  *
30  * Original Win32 dll:
31  * Ver2.23 By Kenji Oshima 2000.09.20
32  * avimszh.dll, avizlib.dll
33  *
34  * A description of the decoding algorithm can be found here:
35  *   http://www.pcisys.net/~melanson/codecs
36  *
37  * Supports: BGR24 (RGB 24bpp)
38  *
39  */
40
41 #include <stdio.h>
42 #include <stdlib.h>
43
44 #include "avcodec.h"
45 #include "bitstream.h"
46 #include "lcl.h"
47
48 #ifdef CONFIG_ZLIB
49 #include <zlib.h>
50 #endif
51
52 /*
53  * Decoder context
54  */
55 typedef struct LclDecContext {
56
57         AVCodecContext *avctx;
58         AVFrame pic;
59
60     // Image type
61     int imgtype;
62     // Compression type
63     int compression;
64     // Flags
65     int flags;
66     // Decompressed data size
67     unsigned int decomp_size;
68     // Decompression buffer
69     unsigned char* decomp_buf;
70 #ifdef CONFIG_ZLIB
71     z_stream zstream;
72 #endif
73 } LclDecContext;
74
75
76 /*
77  *
78  * Helper functions
79  *
80  */
81 static inline unsigned char fix (int pix14)
82 {
83     int tmp;
84
85     tmp = (pix14 + 0x80000) >> 20;
86     if (tmp < 0)
87         return 0;
88     if (tmp > 255)
89         return 255;
90     return tmp;
91 }
92
93
94
95 static inline unsigned char get_b (unsigned char yq, signed char bq)
96 {
97     return fix((yq << 20) + bq * 1858076);
98 }
99
100
101
102 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
103 {
104     return fix((yq << 20) - bq * 360857 - rq * 748830);
105 }
106
107
108
109 static inline unsigned char get_r (unsigned char yq, signed char rq)
110 {
111     return fix((yq << 20) + rq * 1470103);
112 }
113
114
115
116 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
117 {
118     unsigned char *destptr_bak = destptr;
119     unsigned char *destptr_end = destptr + destsize;
120     unsigned char mask = 0;
121     unsigned char maskbit = 0;
122     unsigned int ofs, cnt;
123
124     while ((srclen > 0) && (destptr < destptr_end)) {
125         if (maskbit == 0) {
126             mask = *(srcptr++);
127             maskbit = 8;
128             srclen--;
129             continue;
130         }
131         if ((mask & (1 << (--maskbit))) == 0) {
132             if (destptr + 4 > destptr_end)
133                 break;
134             *(int*)destptr = *(int*)srcptr;
135             srclen -= 4;
136             destptr += 4;
137             srcptr += 4;
138         } else {
139             ofs = *(srcptr++);
140             cnt = *(srcptr++);
141             ofs += cnt * 256;;
142             cnt = ((cnt >> 3) & 0x1f) + 1;
143             ofs &= 0x7ff;
144             srclen -= 2;
145             cnt *= 4;
146             if (destptr + cnt > destptr_end) {
147                 cnt =  destptr_end - destptr;
148             }
149             for (; cnt > 0; cnt--) {
150                 *(destptr) = *(destptr - ofs);
151                 destptr++;
152             }
153         }
154     }
155
156     return (destptr - destptr_bak);
157 }
158
159
160
161 /*
162  *
163  * Decode a frame
164  *
165  */
166 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
167 {
168         LclDecContext * const c = avctx->priv_data;
169         unsigned char *encoded = (unsigned char *)buf;
170     unsigned int pixel_ptr;
171     int row, col;
172     unsigned char *outptr;
173     unsigned int width = avctx->width; // Real image width
174     unsigned int height = avctx->height; // Real image height
175     unsigned int mszh_dlen;
176     unsigned char yq, y1q, uq, vq;
177     int uqvq;
178     unsigned int mthread_inlen, mthread_outlen;
179 #ifdef CONFIG_ZLIB
180     int zret; // Zlib return code
181 #endif
182     unsigned int len = buf_size;
183
184         if(c->pic.data[0])
185                 avctx->release_buffer(avctx, &c->pic);
186
187         c->pic.reference = 0;
188         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
189         if(avctx->get_buffer(avctx, &c->pic) < 0){
190                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
191                 return -1;
192         }
193
194     outptr = c->pic.data[0]; // Output image pointer
195
196     /* Decompress frame */
197     switch (avctx->codec_id) {
198         case CODEC_ID_MSZH:
199             switch (c->compression) {
200                 case COMP_MSZH:
201                     if (c->flags & FLAG_MULTITHREAD) {
202                         mthread_inlen = *((unsigned int*)encoded);
203                         mthread_outlen = *((unsigned int*)(encoded+4));
204                         if (mthread_outlen > c->decomp_size) // this should not happen
205                             mthread_outlen = c->decomp_size;
206                         mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
207                         if (mthread_outlen != mszh_dlen) {
208                             av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
209                                    mthread_outlen, mszh_dlen);
210                             return -1;
211                         }
212                         mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
213                                                 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
214                         if (mthread_outlen != mszh_dlen) {
215                             av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
216                                    mthread_outlen, mszh_dlen);
217                             return -1;
218                         }
219                         encoded = c->decomp_buf;
220                         len = c->decomp_size;
221                     } else {
222                         mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
223                         if (c->decomp_size != mszh_dlen) {
224                             av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
225                                    c->decomp_size, mszh_dlen);
226                             return -1;
227                         }
228                         encoded = c->decomp_buf;
229                         len = mszh_dlen;
230                     }
231                     break;
232                 case COMP_MSZH_NOCOMP:
233                     break;
234                 default:
235                     av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
236                     return -1;
237             }
238             break;
239         case CODEC_ID_ZLIB:
240 #ifdef CONFIG_ZLIB
241             /* Using the original dll with normal compression (-1) and RGB format
242              * gives a file with ZLIB fourcc, but frame is really uncompressed.
243              * To be sure that's true check also frame size */
244             if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
245                (len == width * height * 3))
246                 break;
247             zret = inflateReset(&(c->zstream));
248             if (zret != Z_OK) {
249                 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
250                 return -1;
251             }
252             if (c->flags & FLAG_MULTITHREAD) {
253                 mthread_inlen = *((unsigned int*)encoded);
254                 mthread_outlen = *((unsigned int*)(encoded+4));
255                 if (mthread_outlen > c->decomp_size)
256                     mthread_outlen = c->decomp_size;
257                 c->zstream.next_in = encoded + 8;
258                 c->zstream.avail_in = mthread_inlen;
259                 c->zstream.next_out = c->decomp_buf;
260                 c->zstream.avail_out = c->decomp_size;
261                 zret = inflate(&(c->zstream), Z_FINISH);
262                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
263                     av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
264                     return -1;
265                 }
266                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
267                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
268                            mthread_outlen, c->zstream.total_out);
269                     return -1;
270                 }
271                 zret = inflateReset(&(c->zstream));
272                 if (zret != Z_OK) {
273                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
274                     return -1;
275                 }
276                 c->zstream.next_in = encoded + 8 + mthread_inlen;
277                 c->zstream.avail_in = len - mthread_inlen;
278                 c->zstream.next_out = c->decomp_buf + mthread_outlen;
279                 c->zstream.avail_out = c->decomp_size - mthread_outlen;
280                 zret = inflate(&(c->zstream), Z_FINISH);
281                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
282                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
283                     return -1;
284                 }
285                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
286                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
287                            mthread_outlen, c->zstream.total_out);
288                     return -1;
289                 }
290             } else {
291                 c->zstream.next_in = encoded;
292                 c->zstream.avail_in = len;
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, "Inflate error: %d\n", zret);
298                     return -1;
299                 }
300                 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
301                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
302                            c->decomp_size, c->zstream.total_out);
303                     return -1;
304                 }
305             }
306             encoded = c->decomp_buf;
307             len = c->decomp_size;;
308 #else
309             av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
310             return -1;
311 #endif
312             break;
313         default:
314             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
315             return -1;
316     }
317
318
319     /* Apply PNG filter */
320     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
321         switch (c->imgtype) {
322             case IMGTYPE_YUV111:
323             case IMGTYPE_RGB24:
324                 for (row = 0; row < height; row++) {
325                     pixel_ptr = row * width * 3;
326                     yq = encoded[pixel_ptr++];
327                     uqvq = AV_RL16(encoded+pixel_ptr);
328                     pixel_ptr += 2;
329                     for (col = 1; col < width; col++) {
330                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
331                         uqvq -= AV_RL16(encoded+pixel_ptr+1);
332                         AV_WL16(encoded+pixel_ptr+1, uqvq);
333                         pixel_ptr += 3;
334                     }
335                 }
336                 break;
337             case IMGTYPE_YUV422:
338                 for (row = 0; row < height; row++) {
339                     pixel_ptr = row * width * 2;
340                     yq = uq = vq =0;
341                     for (col = 0; col < width/4; col++) {
342                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
343                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
344                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
345                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
346                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
347                         encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
348                         encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
349                         encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
350                         pixel_ptr += 8;
351                     }
352                 }
353                 break;
354             case IMGTYPE_YUV411:
355                 for (row = 0; row < height; row++) {
356                     pixel_ptr = row * width / 2 * 3;
357                     yq = uq = vq =0;
358                     for (col = 0; col < width/4; col++) {
359                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
360                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
361                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
362                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
363                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
364                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
365                         pixel_ptr += 6;
366                     }
367                 }
368                 break;
369             case IMGTYPE_YUV211:
370                 for (row = 0; row < height; row++) {
371                     pixel_ptr = row * width * 2;
372                     yq = uq = vq =0;
373                     for (col = 0; col < width/2; col++) {
374                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
375                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
376                         encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
377                         encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
378                         pixel_ptr += 4;
379                     }
380                 }
381                 break;
382             case IMGTYPE_YUV420:
383                 for (row = 0; row < height/2; row++) {
384                     pixel_ptr = row * width * 3;
385                     yq = y1q = uq = vq =0;
386                     for (col = 0; col < width/2; col++) {
387                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
388                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
389                         encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
390                         encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
391                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
392                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
393                         pixel_ptr += 6;
394                     }
395                 }
396                 break;
397             default:
398                 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
399                 return -1;
400         }
401     }
402
403     /* Convert colorspace */
404     switch (c->imgtype) {
405         case IMGTYPE_YUV111:
406             for (row = height - 1; row >= 0; row--) {
407                 pixel_ptr = row * c->pic.linesize[0];
408                 for (col = 0; col < width; col++) {
409                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
410                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
411                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
412                     encoded += 3;
413                 }
414             }
415             break;
416         case IMGTYPE_YUV422:
417             for (row = height - 1; row >= 0; row--) {
418                 pixel_ptr = row * c->pic.linesize[0];
419                 for (col = 0; col < width/4; col++) {
420                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
421                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
422                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
423                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
424                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
425                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
426                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
427                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
428                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
429                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
430                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
431                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
432                     encoded += 8;
433                 }
434             }
435             break;
436         case IMGTYPE_RGB24:
437             for (row = height - 1; row >= 0; row--) {
438                 pixel_ptr = row * c->pic.linesize[0];
439                 for (col = 0; col < width; col++) {
440                     outptr[pixel_ptr++] = encoded[0];
441                     outptr[pixel_ptr++] = encoded[1];
442                     outptr[pixel_ptr++] = encoded[2];
443                     encoded += 3;
444                 }
445             }
446             break;
447         case IMGTYPE_YUV411:
448             for (row = height - 1; row >= 0; row--) {
449                 pixel_ptr = row * c->pic.linesize[0];
450                 for (col = 0; col < width/4; col++) {
451                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
452                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
453                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
454                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
455                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
456                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
457                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
458                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
459                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
460                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
461                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
462                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
463                     encoded += 6;
464                 }
465             }
466             break;
467         case IMGTYPE_YUV211:
468             for (row = height - 1; row >= 0; row--) {
469                 pixel_ptr = row * c->pic.linesize[0];
470                 for (col = 0; col < width/2; col++) {
471                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
472                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
473                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
474                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
475                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
476                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
477                     encoded += 4;
478                 }
479             }
480             break;
481         case IMGTYPE_YUV420:
482             for (row = height / 2 - 1; row >= 0; row--) {
483                 pixel_ptr = 2 * row * c->pic.linesize[0];
484                 for (col = 0; col < width/2; col++) {
485                     outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
486                     outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
487                     outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
488                     outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
489                     outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
490                     outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
491                     outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
492                     outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
493                     outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
494                     outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
495                     outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
496                     outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
497                     pixel_ptr += 6;
498                     encoded += 6;
499                 }
500             }
501             break;
502         default:
503             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
504             return -1;
505     }
506
507     *data_size = sizeof(AVFrame);
508     *(AVFrame*)data = c->pic;
509
510     /* always report that the buffer was completely consumed */
511     return buf_size;
512 }
513
514 /*
515  *
516  * Init lcl decoder
517  *
518  */
519 static int decode_init(AVCodecContext *avctx)
520 {
521     LclDecContext * const c = avctx->priv_data;
522     unsigned int basesize = avctx->width * avctx->height;
523     unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
524     unsigned int max_decomp_size;
525     int zret; // Zlib return code
526
527     c->avctx = avctx;
528
529     c->pic.data[0] = NULL;
530
531 #ifdef CONFIG_ZLIB
532     // Needed if zlib unused or init aborted before inflateInit
533     memset(&(c->zstream), 0, sizeof(z_stream));
534 #endif
535
536     if (avctx->extradata_size < 8) {
537         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
538         return 1;
539     }
540
541     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
542         return 1;
543     }
544
545     /* Check codec type */
546     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
547         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
548         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
549     }
550
551     /* Detect image type */
552     switch (c->imgtype = *((char *)avctx->extradata + 4)) {
553         case IMGTYPE_YUV111:
554             c->decomp_size = basesize * 3;
555             max_decomp_size = max_basesize * 3;
556             av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
557             break;
558         case IMGTYPE_YUV422:
559             c->decomp_size = basesize * 2;
560             max_decomp_size = max_basesize * 2;
561             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
562             break;
563         case IMGTYPE_RGB24:
564             c->decomp_size = basesize * 3;
565             max_decomp_size = max_basesize * 3;
566             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
567             break;
568         case IMGTYPE_YUV411:
569             c->decomp_size = basesize / 2 * 3;
570             max_decomp_size = max_basesize / 2 * 3;
571             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
572             break;
573         case IMGTYPE_YUV211:
574             c->decomp_size = basesize * 2;
575             max_decomp_size = max_basesize * 2;
576             av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
577             break;
578         case IMGTYPE_YUV420:
579             c->decomp_size = basesize / 2 * 3;
580             max_decomp_size = max_basesize / 2 * 3;
581             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
582             break;
583         default:
584             av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
585             return 1;
586     }
587
588     /* Detect compression method */
589     c->compression = *((char *)avctx->extradata + 5);
590     switch (avctx->codec_id) {
591         case CODEC_ID_MSZH:
592             switch (c->compression) {
593                 case COMP_MSZH:
594                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
595                     break;
596                 case COMP_MSZH_NOCOMP:
597                     c->decomp_size = 0;
598                     av_log(avctx, AV_LOG_INFO, "No compression.\n");
599                     break;
600                 default:
601                     av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
602                     return 1;
603             }
604             break;
605         case CODEC_ID_ZLIB:
606 #ifdef CONFIG_ZLIB
607             switch (c->compression) {
608                 case COMP_ZLIB_HISPEED:
609                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
610                     break;
611                 case COMP_ZLIB_HICOMP:
612                     av_log(avctx, AV_LOG_INFO, "High compression.\n");
613                     break;
614                 case COMP_ZLIB_NORMAL:
615                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
616                     break;
617                 default:
618                     if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
619                             av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
620                         return 1;
621                     }
622                     av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
623             }
624 #else
625             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
626             return 1;
627 #endif
628             break;
629         default:
630             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
631             return 1;
632     }
633
634     /* Allocate decompression buffer */
635     if (c->decomp_size) {
636         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
637             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
638             return 1;
639         }
640     }
641
642     /* Detect flags */
643     c->flags = *((char *)avctx->extradata + 6);
644     if (c->flags & FLAG_MULTITHREAD)
645         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
646     if (c->flags & FLAG_NULLFRAME)
647         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
648     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
649         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
650     if (c->flags & FLAGMASK_UNUSED)
651         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
652
653     /* If needed init zlib */
654     if (avctx->codec_id == CODEC_ID_ZLIB) {
655 #ifdef CONFIG_ZLIB
656         c->zstream.zalloc = Z_NULL;
657         c->zstream.zfree = Z_NULL;
658         c->zstream.opaque = Z_NULL;
659         zret = inflateInit(&(c->zstream));
660         if (zret != Z_OK) {
661             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
662             return 1;
663         }
664 #else
665     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
666     return 1;
667 #endif
668     }
669
670     avctx->pix_fmt = PIX_FMT_BGR24;
671
672     return 0;
673 }
674
675 /*
676  *
677  * Uninit lcl decoder
678  *
679  */
680 static int decode_end(AVCodecContext *avctx)
681 {
682         LclDecContext * const c = avctx->priv_data;
683
684         if (c->pic.data[0])
685                 avctx->release_buffer(avctx, &c->pic);
686 #ifdef CONFIG_ZLIB
687     inflateEnd(&(c->zstream));
688 #endif
689
690         return 0;
691 }
692
693 #ifdef CONFIG_MSZH_DECODER
694 AVCodec mszh_decoder = {
695         "mszh",
696         CODEC_TYPE_VIDEO,
697         CODEC_ID_MSZH,
698         sizeof(LclDecContext),
699         decode_init,
700         NULL,
701         decode_end,
702         decode_frame,
703         CODEC_CAP_DR1,
704 };
705 #endif
706
707 #ifdef CONFIG_ZLIB_DECODER
708 AVCodec zlib_decoder = {
709         "zlib",
710         CODEC_TYPE_VIDEO,
711         CODEC_ID_ZLIB,
712         sizeof(LclDecContext),
713         decode_init,
714         NULL,
715         decode_end,
716         decode_frame,
717         CODEC_CAP_DR1,
718 };
719 #endif