b02ea1543f54d26dee3a6afc1b86b45ce27f5a9c
[ffmpeg.git] / 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