6f187f8734f28b12193f5d72325394c35eb31f7e
[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 "avcodec.h"
46 #include "bitstream.h"
47
48 #ifdef CONFIG_ZLIB
49 #include <zlib.h>
50 #endif
51
52
53 #define BMPTYPE_YUV 1
54 #define BMPTYPE_RGB 2
55
56 #define IMGTYPE_YUV111 0
57 #define IMGTYPE_YUV422 1
58 #define IMGTYPE_RGB24 2
59 #define IMGTYPE_YUV411 3
60 #define IMGTYPE_YUV211 4
61 #define IMGTYPE_YUV420 5
62
63 #define COMP_MSZH 0
64 #define COMP_MSZH_NOCOMP 1
65 #define COMP_ZLIB_HISPEED 1
66 #define COMP_ZLIB_HICOMP 9
67 #define COMP_ZLIB_NORMAL -1
68
69 #define FLAG_MULTITHREAD 1
70 #define FLAG_NULLFRAME 2
71 #define FLAG_PNGFILTER 4
72 #define FLAGMASK_UNUSED 0xf8
73
74 #define CODEC_MSZH 1
75 #define CODEC_ZLIB 3
76
77 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
78 #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
79
80 /*
81  * Decoder context
82  */
83 typedef struct LclContext {
84
85         AVCodecContext *avctx;
86         AVFrame pic;
87     PutBitContext pb;
88
89     // Image type
90     int imgtype;
91     // Compression type
92     int compression;
93     // Flags
94     int flags;
95     // Decompressed data size
96     unsigned int decomp_size;
97     // Decompression buffer
98     unsigned char* decomp_buf;
99     // Maximum compressed data size
100     unsigned int max_comp_size;
101     // Compression buffer
102     unsigned char* comp_buf;
103 #ifdef CONFIG_ZLIB
104     z_stream zstream;
105 #endif
106 } LclContext;
107
108
109 /*
110  *
111  * Helper functions
112  *
113  */
114 static inline unsigned char fix (int pix14)
115 {
116     int tmp;
117
118     tmp = (pix14 + 0x80000) >> 20;
119     if (tmp < 0)
120         return 0;
121     if (tmp > 255)
122         return 255;
123     return tmp;
124 }
125
126
127
128 static inline unsigned char get_b (unsigned char yq, signed char bq)
129 {
130     return fix((yq << 20) + bq * 1858076);
131 }
132
133
134
135 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
136 {
137     return fix((yq << 20) - bq * 360857 - rq * 748830);
138 }
139
140
141
142 static inline unsigned char get_r (unsigned char yq, signed char rq)
143 {
144     return fix((yq << 20) + rq * 1470103);
145 }
146
147
148
149 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
150 {
151     unsigned char *destptr_bak = destptr;
152     unsigned char *destptr_end = destptr + destsize;
153     unsigned char mask = 0;
154     unsigned char maskbit = 0;
155     unsigned int ofs, cnt;
156
157     while ((srclen > 0) && (destptr < destptr_end)) {
158         if (maskbit == 0) {
159             mask = *(srcptr++);
160             maskbit = 8;
161             srclen--;
162             continue;
163         }
164         if ((mask & (1 << (--maskbit))) == 0) {
165             if (destptr + 4 > destptr_end)
166                 break;
167             *(int*)destptr = *(int*)srcptr;
168             srclen -= 4;
169             destptr += 4;
170             srcptr += 4;
171         } else {
172             ofs = *(srcptr++);
173             cnt = *(srcptr++);
174             ofs += cnt * 256;;
175             cnt = ((cnt >> 3) & 0x1f) + 1;
176             ofs &= 0x7ff;
177             srclen -= 2;
178             cnt *= 4;
179             if (destptr + cnt > destptr_end) {
180                 cnt =  destptr_end - destptr;
181             }
182             for (; cnt > 0; cnt--) {
183                 *(destptr) = *(destptr - ofs);
184                 destptr++;
185             }
186         }
187     }
188
189     return (destptr - destptr_bak);
190 }
191
192
193
194 #ifdef CONFIG_DECODERS
195 /*
196  *
197  * Decode a frame
198  *
199  */
200 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
201 {
202         LclContext * const c = avctx->priv_data;
203         unsigned char *encoded = (unsigned char *)buf;
204     unsigned int pixel_ptr;
205     int row, col;
206     unsigned char *outptr;
207     unsigned int width = avctx->width; // Real image width
208     unsigned int height = avctx->height; // Real image height
209     unsigned int mszh_dlen;
210     unsigned char yq, y1q, uq, vq;
211     int uqvq;
212     unsigned int mthread_inlen, mthread_outlen;
213 #ifdef CONFIG_ZLIB
214     int zret; // Zlib return code
215 #endif
216     unsigned int len = buf_size;
217
218         if(c->pic.data[0])
219                 avctx->release_buffer(avctx, &c->pic);
220
221         c->pic.reference = 0;
222         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
223         if(avctx->get_buffer(avctx, &c->pic) < 0){
224                 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
225                 return -1;
226         }
227
228     outptr = c->pic.data[0]; // Output image pointer
229
230     /* Decompress frame */
231     switch (avctx->codec_id) {
232         case CODEC_ID_MSZH:
233             switch (c->compression) {
234                 case COMP_MSZH:
235                     if (c->flags & FLAG_MULTITHREAD) {
236                         mthread_inlen = *((unsigned int*)encoded);
237                         mthread_outlen = *((unsigned int*)(encoded+4));
238                         if (mthread_outlen > c->decomp_size) // this should not happen
239                             mthread_outlen = c->decomp_size;
240                         mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
241                         if (mthread_outlen != mszh_dlen) {
242                             av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
243                                    mthread_outlen, mszh_dlen);
244                             return -1;
245                         }
246                         mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
247                                                 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
248                         if (mthread_outlen != mszh_dlen) {
249                             av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
250                                    mthread_outlen, mszh_dlen);
251                             return -1;
252                         }
253                         encoded = c->decomp_buf;
254                         len = c->decomp_size;
255                     } else {
256                         mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
257                         if (c->decomp_size != mszh_dlen) {
258                             av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
259                                    c->decomp_size, mszh_dlen);
260                             return -1;
261                         }
262                         encoded = c->decomp_buf;
263                         len = mszh_dlen;
264                     }
265                     break;
266                 case COMP_MSZH_NOCOMP:
267                     break;
268                 default:
269                     av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
270                     return -1;
271             }
272             break;
273         case CODEC_ID_ZLIB:
274 #ifdef CONFIG_ZLIB
275             /* Using the original dll with normal compression (-1) and RGB format
276              * gives a file with ZLIB fourcc, but frame is really uncompressed.
277              * To be sure that's true check also frame size */
278             if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
279                (len == width * height * 3))
280                 break;
281             zret = inflateReset(&(c->zstream));
282             if (zret != Z_OK) {
283                 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
284                 return -1;
285             }
286             if (c->flags & FLAG_MULTITHREAD) {
287                 mthread_inlen = *((unsigned int*)encoded);
288                 mthread_outlen = *((unsigned int*)(encoded+4));
289                 if (mthread_outlen > c->decomp_size)
290                     mthread_outlen = c->decomp_size;
291                 c->zstream.next_in = encoded + 8;
292                 c->zstream.avail_in = mthread_inlen;
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, "Mthread1 inflate error: %d\n", zret);
298                     return -1;
299                 }
300                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
301                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
302                            mthread_outlen, c->zstream.total_out);
303                     return -1;
304                 }
305                 zret = inflateReset(&(c->zstream));
306                 if (zret != Z_OK) {
307                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
308                     return -1;
309                 }
310                 c->zstream.next_in = encoded + 8 + mthread_inlen;
311                 c->zstream.avail_in = len - mthread_inlen;
312                 c->zstream.next_out = c->decomp_buf + mthread_outlen;
313                 c->zstream.avail_out = c->decomp_size - mthread_outlen;
314                 zret = inflate(&(c->zstream), Z_FINISH);
315                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
316                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
317                     return -1;
318                 }
319                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
320                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
321                            mthread_outlen, c->zstream.total_out);
322                     return -1;
323                 }
324             } else {
325                 c->zstream.next_in = encoded;
326                 c->zstream.avail_in = len;
327                 c->zstream.next_out = c->decomp_buf;
328                 c->zstream.avail_out = c->decomp_size;
329                 zret = inflate(&(c->zstream), Z_FINISH);
330                 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
331                     av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
332                     return -1;
333                 }
334                 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
335                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
336                            c->decomp_size, c->zstream.total_out);
337                     return -1;
338                 }
339             }
340             encoded = c->decomp_buf;
341             len = c->decomp_size;;
342 #else
343             av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
344             return -1;
345 #endif
346             break;
347         default:
348             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
349             return -1;
350     }
351
352
353     /* Apply PNG filter */
354     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
355         switch (c->imgtype) {
356             case IMGTYPE_YUV111:
357             case IMGTYPE_RGB24:
358                 for (row = 0; row < height; row++) {
359                     pixel_ptr = row * width * 3;
360                     yq = encoded[pixel_ptr++];
361                     uqvq = encoded[pixel_ptr++];
362                     uqvq+=(encoded[pixel_ptr++] << 8);
363                     for (col = 1; col < width; col++) {
364                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
365                         uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
366                         encoded[pixel_ptr+1] = (uqvq) & 0xff;
367                         encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
368                         pixel_ptr += 3;
369                     }
370                 }
371                 break;
372             case IMGTYPE_YUV422:
373                 for (row = 0; row < height; row++) {
374                     pixel_ptr = row * width * 2;
375                     yq = uq = vq =0;
376                     for (col = 0; col < width/4; col++) {
377                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
378                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
379                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
380                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
381                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
382                         encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
383                         encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
384                         encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
385                         pixel_ptr += 8;
386                     }
387                 }
388                 break;
389             case IMGTYPE_YUV411:
390                 for (row = 0; row < height; row++) {
391                     pixel_ptr = row * width / 2 * 3;
392                     yq = uq = vq =0;
393                     for (col = 0; col < width/4; col++) {
394                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
395                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
396                         encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
397                         encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
398                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
399                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
400                         pixel_ptr += 6;
401                     }
402                 }
403                 break;
404             case IMGTYPE_YUV211:
405                 for (row = 0; row < height; row++) {
406                     pixel_ptr = row * width * 2;
407                     yq = uq = vq =0;
408                     for (col = 0; col < width/2; col++) {
409                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
410                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
411                         encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
412                         encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
413                         pixel_ptr += 4;
414                     }
415                 }
416                 break;
417             case IMGTYPE_YUV420:
418                 for (row = 0; row < height/2; row++) {
419                     pixel_ptr = row * width * 3;
420                     yq = y1q = uq = vq =0;
421                     for (col = 0; col < width/2; col++) {
422                         encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
423                         encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
424                         encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
425                         encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
426                         encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
427                         encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
428                         pixel_ptr += 6;
429                     }
430                 }
431                 break;
432             default:
433                 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
434                 return -1;
435         }
436     }
437
438     /* Convert colorspace */
439     switch (c->imgtype) {
440         case IMGTYPE_YUV111:
441             for (row = height - 1; row >= 0; row--) {
442                 pixel_ptr = row * c->pic.linesize[0];
443                 for (col = 0; col < width; col++) {
444                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
445                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
446                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
447                     encoded += 3;
448                 }
449             }
450             break;
451         case IMGTYPE_YUV422:
452             for (row = height - 1; row >= 0; row--) {
453                 pixel_ptr = row * c->pic.linesize[0];
454                 for (col = 0; col < width/4; col++) {
455                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
456                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
457                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
458                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
459                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
460                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
461                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
462                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
463                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
464                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
465                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
466                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
467                     encoded += 8;
468                 }
469             }
470             break;
471         case IMGTYPE_RGB24:
472             for (row = height - 1; row >= 0; row--) {
473                 pixel_ptr = row * c->pic.linesize[0];
474                 for (col = 0; col < width; col++) {
475                     outptr[pixel_ptr++] = encoded[0];
476                     outptr[pixel_ptr++] = encoded[1];
477                     outptr[pixel_ptr++] = encoded[2];
478                     encoded += 3;
479                 }
480             }
481             break;
482         case IMGTYPE_YUV411:
483             for (row = height - 1; row >= 0; row--) {
484                 pixel_ptr = row * c->pic.linesize[0];
485                 for (col = 0; col < width/4; col++) {
486                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
487                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
488                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
489                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
490                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
491                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
492                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
493                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
494                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
495                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
496                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
497                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
498                     encoded += 6;
499                 }
500             }
501             break;
502         case IMGTYPE_YUV211:
503             for (row = height - 1; row >= 0; row--) {
504                 pixel_ptr = row * c->pic.linesize[0];
505                 for (col = 0; col < width/2; col++) {
506                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
507                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
508                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
509                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
510                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
511                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
512                     encoded += 4;
513                 }
514             }
515             break;
516         case IMGTYPE_YUV420:
517             for (row = height / 2 - 1; row >= 0; row--) {
518                 pixel_ptr = 2 * row * c->pic.linesize[0];
519                 for (col = 0; col < width/2; col++) {
520                     outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
521                     outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
522                     outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
523                     outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
524                     outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
525                     outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
526                     outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
527                     outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
528                     outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
529                     outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
530                     outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
531                     outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
532                     pixel_ptr += 6;
533                     encoded += 6;
534                 }
535             }
536             break;
537         default:
538             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
539             return -1;
540     }
541
542     *data_size = sizeof(AVFrame);
543     *(AVFrame*)data = c->pic;
544
545     /* always report that the buffer was completely consumed */
546     return buf_size;
547 }
548 #endif
549
550 #ifdef CONFIG_ENCODERS
551 /*
552  *
553  * Encode a frame
554  *
555  */
556 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
557     LclContext *c = avctx->priv_data;
558     AVFrame *pict = data;
559     AVFrame * const p = &c->pic;
560     int i;
561     int zret; // Zlib return code
562
563 #ifndef CONFIG_ZLIB
564     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
565     return -1;
566 #else
567
568     init_put_bits(&c->pb, buf, buf_size);
569
570     *p = *pict;
571     p->pict_type= FF_I_TYPE;
572     p->key_frame= 1;
573
574     if(avctx->pix_fmt != PIX_FMT_BGR24){
575         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
576         return -1;
577     }
578
579     zret = deflateReset(&(c->zstream));
580     if (zret != Z_OK) {
581         av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
582         return -1;
583     }
584     c->zstream.next_out = c->comp_buf;
585     c->zstream.avail_out = c->max_comp_size;
586
587     for(i = avctx->height - 1; i >= 0; i--) {
588         c->zstream.next_in = p->data[0]+p->linesize[0]*i;
589         c->zstream.avail_in = avctx->width*3;
590         zret = deflate(&(c->zstream), Z_NO_FLUSH);
591         if (zret != Z_OK) {
592             av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
593             return -1;
594         }
595     }
596     zret = deflate(&(c->zstream), Z_FINISH);
597     if (zret != Z_STREAM_END) {
598         av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
599         return -1;
600     }
601
602     for (i = 0; i < c->zstream.total_out; i++)
603         put_bits(&c->pb, 8, c->comp_buf[i]);
604     flush_put_bits(&c->pb);
605
606     return c->zstream.total_out;
607 #endif
608 }
609 #endif /* CONFIG_ENCODERS */
610
611 #ifdef CONFIG_DECODERS
612 /*
613  *
614  * Init lcl decoder
615  *
616  */
617 static int decode_init(AVCodecContext *avctx)
618 {
619     LclContext * const c = avctx->priv_data;
620     unsigned int basesize = avctx->width * avctx->height;
621     unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
622     unsigned int max_decomp_size;
623     int zret; // Zlib return code
624
625     c->avctx = avctx;
626
627     c->pic.data[0] = NULL;
628
629 #ifdef CONFIG_ZLIB
630     // Needed if zlib unused or init aborted before inflateInit
631     memset(&(c->zstream), 0, sizeof(z_stream));
632 #endif
633
634     if (avctx->extradata_size < 8) {
635         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
636         return 1;
637     }
638
639     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
640         return 1;
641     }
642
643     /* Check codec type */
644     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
645         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
646         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
647     }
648
649     /* Detect image type */
650     switch (c->imgtype = *((char *)avctx->extradata + 4)) {
651         case IMGTYPE_YUV111:
652             c->decomp_size = basesize * 3;
653             max_decomp_size = max_basesize * 3;
654             av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
655             break;
656         case IMGTYPE_YUV422:
657             c->decomp_size = basesize * 2;
658             max_decomp_size = max_basesize * 2;
659             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
660             break;
661         case IMGTYPE_RGB24:
662             c->decomp_size = basesize * 3;
663             max_decomp_size = max_basesize * 3;
664             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
665             break;
666         case IMGTYPE_YUV411:
667             c->decomp_size = basesize / 2 * 3;
668             max_decomp_size = max_basesize / 2 * 3;
669             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
670             break;
671         case IMGTYPE_YUV211:
672             c->decomp_size = basesize * 2;
673             max_decomp_size = max_basesize * 2;
674             av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
675             break;
676         case IMGTYPE_YUV420:
677             c->decomp_size = basesize / 2 * 3;
678             max_decomp_size = max_basesize / 2 * 3;
679             av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
680             break;
681         default:
682             av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
683             return 1;
684     }
685
686     /* Detect compression method */
687     c->compression = *((char *)avctx->extradata + 5);
688     switch (avctx->codec_id) {
689         case CODEC_ID_MSZH:
690             switch (c->compression) {
691                 case COMP_MSZH:
692                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
693                     break;
694                 case COMP_MSZH_NOCOMP:
695                     c->decomp_size = 0;
696                     av_log(avctx, AV_LOG_INFO, "No compression.\n");
697                     break;
698                 default:
699                     av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
700                     return 1;
701             }
702             break;
703         case CODEC_ID_ZLIB:
704 #ifdef CONFIG_ZLIB
705             switch (c->compression) {
706                 case COMP_ZLIB_HISPEED:
707                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
708                     break;
709                 case COMP_ZLIB_HICOMP:
710                     av_log(avctx, AV_LOG_INFO, "High compression.\n");
711                     break;
712                 case COMP_ZLIB_NORMAL:
713                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
714                     break;
715                 default:
716                     if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
717                             av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
718                         return 1;
719                     }
720                     av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
721             }
722 #else
723             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
724             return 1;
725 #endif
726             break;
727         default:
728             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
729             return 1;
730     }
731
732     /* Allocate decompression buffer */
733     if (c->decomp_size) {
734         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
735             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
736             return 1;
737         }
738     }
739
740     /* Detect flags */
741     c->flags = *((char *)avctx->extradata + 6);
742     if (c->flags & FLAG_MULTITHREAD)
743         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
744     if (c->flags & FLAG_NULLFRAME)
745         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
746     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
747         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
748     if (c->flags & FLAGMASK_UNUSED)
749         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
750
751     /* If needed init zlib */
752     if (avctx->codec_id == CODEC_ID_ZLIB) {
753 #ifdef CONFIG_ZLIB
754         c->zstream.zalloc = Z_NULL;
755         c->zstream.zfree = Z_NULL;
756         c->zstream.opaque = Z_NULL;
757         zret = inflateInit(&(c->zstream));
758         if (zret != Z_OK) {
759             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
760             return 1;
761         }
762 #else
763     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
764     return 1;
765 #endif
766     }
767
768     avctx->pix_fmt = PIX_FMT_BGR24;
769
770     return 0;
771 }
772 #endif /* CONFIG_DECODERS */
773
774 #ifdef CONFIG_ENCODERS
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 #endif /* CONFIG_ENCODERS */
843
844
845
846 #ifdef CONFIG_DECODERS
847 /*
848  *
849  * Uninit lcl decoder
850  *
851  */
852 static int decode_end(AVCodecContext *avctx)
853 {
854         LclContext * const c = 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 #endif
865
866 #ifdef CONFIG_ENCODERS
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 #endif
885
886 #ifdef CONFIG_MSZH_DECODER
887 AVCodec mszh_decoder = {
888         "mszh",
889         CODEC_TYPE_VIDEO,
890         CODEC_ID_MSZH,
891         sizeof(LclContext),
892         decode_init,
893         NULL,
894         decode_end,
895         decode_frame,
896         CODEC_CAP_DR1,
897 };
898 #endif
899
900 #ifdef CONFIG_ZLIB_DECODER
901 AVCodec zlib_decoder = {
902         "zlib",
903         CODEC_TYPE_VIDEO,
904         CODEC_ID_ZLIB,
905         sizeof(LclContext),
906         decode_init,
907         NULL,
908         decode_end,
909         decode_frame,
910         CODEC_CAP_DR1,
911 };
912 #endif
913
914 #ifdef CONFIG_ENCODERS
915
916 AVCodec zlib_encoder = {
917     "zlib",
918     CODEC_TYPE_VIDEO,
919     CODEC_ID_ZLIB,
920     sizeof(LclContext),
921     encode_init,
922     encode_frame,
923     encode_end,
924 };
925
926 #endif //CONFIG_ENCODERS