e710f942a168283e6b41afff396b07d072538672
[ffmpeg.git] / 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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, "Unusupported 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 //    .options = lcl_options,
921 };
922
923 #endif //CONFIG_ENCODERS