2 * LCL (LossLess Codec Library) Codec
3 * Copyright (c) 2002-2004 Roberto Togni
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.
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.
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
23 * LCL (LossLess Codec Library) Video Codec
24 * Decoder for MSZH and ZLIB codecs
25 * Experimental encoder for ZLIB RGB24
30 * Ver2.23 By Kenji Oshima 2000.09.20
31 * avimszh.dll, avizlib.dll
33 * A description of the decoding algorithm can be found here:
34 * http://www.pcisys.net/~melanson/codecs
36 * Supports: BGR24 (RGB 24bpp)
44 #include "bitstream.h"
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
63 #define COMP_MSZH_NOCOMP 1
64 #define COMP_ZLIB_HISPEED 1
65 #define COMP_ZLIB_HICOMP 9
66 #define COMP_ZLIB_NORMAL -1
68 #define FLAG_MULTITHREAD 1
69 #define FLAG_NULLFRAME 2
70 #define FLAG_PNGFILTER 4
71 #define FLAGMASK_UNUSED 0xf8
76 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
77 #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
82 typedef struct LclContext {
84 AVCodecContext *avctx;
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;
113 static inline unsigned char fix (int pix14)
117 tmp = (pix14 + 0x80000) >> 20;
127 static inline unsigned char get_b (unsigned char yq, signed char bq)
129 return fix((yq << 20) + bq * 1858076);
134 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
136 return fix((yq << 20) - bq * 360857 - rq * 748830);
141 static inline unsigned char get_r (unsigned char yq, signed char rq)
143 return fix((yq << 20) + rq * 1470103);
148 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
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;
156 while ((srclen > 0) && (destptr < destptr_end)) {
163 if ((mask & (1 << (--maskbit))) == 0) {
164 if (destptr + 4 > destptr_end)
166 *(int*)destptr = *(int*)srcptr;
174 cnt = ((cnt >> 3) & 0x1f) + 1;
178 if (destptr + cnt > destptr_end) {
179 cnt = destptr_end - destptr;
181 for (; cnt > 0; cnt--) {
182 *(destptr) = *(destptr - ofs);
188 return (destptr - destptr_bak);
199 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
201 LclContext * const c = (LclContext *)avctx->priv_data;
202 unsigned char *encoded = (unsigned char *)buf;
203 unsigned int pixel_ptr;
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;
211 unsigned int mthread_inlen, mthread_outlen;
213 int zret; // Zlib return code
215 unsigned int len = buf_size;
217 /* no supplementary picture */
222 avctx->release_buffer(avctx, &c->pic);
224 c->pic.reference = 0;
225 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
226 if(avctx->get_buffer(avctx, &c->pic) < 0){
227 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
231 outptr = c->pic.data[0]; // Output image pointer
233 /* Decompress frame */
234 switch (avctx->codec_id) {
236 switch (c->compression) {
238 if (c->flags & FLAG_MULTITHREAD) {
239 mthread_inlen = *((unsigned int*)encoded);
240 mthread_outlen = *((unsigned int*)(encoded+4));
241 if (mthread_outlen > c->decomp_size) // this should not happen
242 mthread_outlen = c->decomp_size;
243 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
244 if (mthread_outlen != mszh_dlen) {
245 av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
246 mthread_outlen, mszh_dlen);
249 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
250 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
251 if (mthread_outlen != mszh_dlen) {
252 av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
253 mthread_outlen, mszh_dlen);
256 encoded = c->decomp_buf;
257 len = c->decomp_size;
259 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
260 if (c->decomp_size != mszh_dlen) {
261 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
262 c->decomp_size, mszh_dlen);
265 encoded = c->decomp_buf;
269 case COMP_MSZH_NOCOMP:
272 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
278 /* Using the original dll with normal compression (-1) and RGB format
279 * gives a file with ZLIB fourcc, but frame is really uncompressed.
280 * To be sure that's true check also frame size */
281 if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
282 (len == width * height * 3))
284 zret = inflateReset(&(c->zstream));
286 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
289 if (c->flags & FLAG_MULTITHREAD) {
290 mthread_inlen = *((unsigned int*)encoded);
291 mthread_outlen = *((unsigned int*)(encoded+4));
292 if (mthread_outlen > c->decomp_size)
293 mthread_outlen = c->decomp_size;
294 c->zstream.next_in = encoded + 8;
295 c->zstream.avail_in = mthread_inlen;
296 c->zstream.next_out = c->decomp_buf;
297 c->zstream.avail_out = c->decomp_size;
298 zret = inflate(&(c->zstream), Z_FINISH);
299 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
300 av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
303 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
304 av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
305 mthread_outlen, c->zstream.total_out);
308 zret = inflateReset(&(c->zstream));
310 av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
313 c->zstream.next_in = encoded + 8 + mthread_inlen;
314 c->zstream.avail_in = len - mthread_inlen;
315 c->zstream.next_out = c->decomp_buf + mthread_outlen;
316 c->zstream.avail_out = c->decomp_size - mthread_outlen;
317 zret = inflate(&(c->zstream), Z_FINISH);
318 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
319 av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
322 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
323 av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
324 mthread_outlen, c->zstream.total_out);
328 c->zstream.next_in = encoded;
329 c->zstream.avail_in = len;
330 c->zstream.next_out = c->decomp_buf;
331 c->zstream.avail_out = c->decomp_size;
332 zret = inflate(&(c->zstream), Z_FINISH);
333 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
334 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
337 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
338 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
339 c->decomp_size, c->zstream.total_out);
343 encoded = c->decomp_buf;
344 len = c->decomp_size;;
346 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
351 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
356 /* Apply PNG filter */
357 if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
358 switch (c->imgtype) {
361 for (row = 0; row < height; row++) {
362 pixel_ptr = row * width * 3;
363 yq = encoded[pixel_ptr++];
364 uqvq = encoded[pixel_ptr++];
365 uqvq+=(encoded[pixel_ptr++] << 8);
366 for (col = 1; col < width; col++) {
367 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
368 uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
369 encoded[pixel_ptr+1] = (uqvq) & 0xff;
370 encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
376 for (row = 0; row < height; row++) {
377 pixel_ptr = row * width * 2;
379 for (col = 0; col < width/4; col++) {
380 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
381 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
382 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
383 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
384 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
385 encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
386 encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
387 encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
393 for (row = 0; row < height; row++) {
394 pixel_ptr = row * width / 2 * 3;
396 for (col = 0; col < width/4; col++) {
397 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
398 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
399 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
400 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
401 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
402 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
408 for (row = 0; row < height; row++) {
409 pixel_ptr = row * width * 2;
411 for (col = 0; col < width/2; col++) {
412 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
413 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
414 encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
415 encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
421 for (row = 0; row < height/2; row++) {
422 pixel_ptr = row * width * 3;
423 yq = y1q = uq = vq =0;
424 for (col = 0; col < width/2; col++) {
425 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
426 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
427 encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
428 encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
429 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
430 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
436 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
441 /* Convert colorspace */
442 switch (c->imgtype) {
444 for (row = height - 1; row >= 0; row--) {
445 pixel_ptr = row * c->pic.linesize[0];
446 for (col = 0; col < width; col++) {
447 outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
448 outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
449 outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
455 for (row = height - 1; row >= 0; row--) {
456 pixel_ptr = row * c->pic.linesize[0];
457 for (col = 0; col < width/4; col++) {
458 outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
459 outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
460 outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
461 outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
462 outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
463 outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
464 outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
465 outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
466 outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
467 outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
468 outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
469 outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
475 for (row = height - 1; row >= 0; row--) {
476 pixel_ptr = row * c->pic.linesize[0];
477 for (col = 0; col < width; col++) {
478 outptr[pixel_ptr++] = encoded[0];
479 outptr[pixel_ptr++] = encoded[1];
480 outptr[pixel_ptr++] = encoded[2];
486 for (row = height - 1; row >= 0; row--) {
487 pixel_ptr = row * c->pic.linesize[0];
488 for (col = 0; col < width/4; col++) {
489 outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
490 outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
491 outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
492 outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
493 outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
494 outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
495 outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
496 outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
497 outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
498 outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
499 outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
500 outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
506 for (row = height - 1; row >= 0; row--) {
507 pixel_ptr = row * c->pic.linesize[0];
508 for (col = 0; col < width/2; col++) {
509 outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
510 outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
511 outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
512 outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
513 outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
514 outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
520 for (row = height / 2 - 1; row >= 0; row--) {
521 pixel_ptr = 2 * row * c->pic.linesize[0];
522 for (col = 0; col < width/2; col++) {
523 outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
524 outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
525 outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
526 outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
527 outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
528 outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
529 outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
530 outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
531 outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
532 outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
533 outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
534 outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
541 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
545 *data_size = sizeof(AVFrame);
546 *(AVFrame*)data = c->pic;
548 /* always report that the buffer was completely consumed */
559 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
560 LclContext *c = avctx->priv_data;
561 AVFrame *pict = data;
562 AVFrame * const p = &c->pic;
564 int zret; // Zlib return code
567 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
571 init_put_bits(&c->pb, buf, buf_size);
574 p->pict_type= FF_I_TYPE;
577 if(avctx->pix_fmt != PIX_FMT_BGR24){
578 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
582 zret = deflateReset(&(c->zstream));
584 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
587 c->zstream.next_out = c->comp_buf;
588 c->zstream.avail_out = c->max_comp_size;
590 for(i = avctx->height - 1; i >= 0; i--) {
591 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
592 c->zstream.avail_in = avctx->width*3;
593 zret = deflate(&(c->zstream), Z_NO_FLUSH);
595 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
599 zret = deflate(&(c->zstream), Z_FINISH);
600 if (zret != Z_STREAM_END) {
601 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
605 for (i = 0; i < c->zstream.total_out; i++)
606 put_bits(&c->pb, 8, c->comp_buf[i]);
607 flush_put_bits(&c->pb);
609 return c->zstream.total_out;
620 static int decode_init(AVCodecContext *avctx)
622 LclContext * const c = (LclContext *)avctx->priv_data;
623 unsigned int basesize = avctx->width * avctx->height;
624 unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
625 unsigned int max_decomp_size;
626 int zret; // Zlib return code
629 avctx->has_b_frames = 0;
631 c->pic.data[0] = NULL;
634 // Needed if zlib unused or init aborted before inflateInit
635 memset(&(c->zstream), 0, sizeof(z_stream));
638 if (avctx->extradata_size < 8) {
639 av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
643 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
647 /* Check codec type */
648 if (((avctx->codec_id == CODEC_ID_MSZH) && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
649 ((avctx->codec_id == CODEC_ID_ZLIB) && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
650 av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
653 /* Detect image type */
654 switch (c->imgtype = *((char *)avctx->extradata + 4)) {
656 c->decomp_size = basesize * 3;
657 max_decomp_size = max_basesize * 3;
658 av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
661 c->decomp_size = basesize * 2;
662 max_decomp_size = max_basesize * 2;
663 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
666 c->decomp_size = basesize * 3;
667 max_decomp_size = max_basesize * 3;
668 av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
671 c->decomp_size = basesize / 2 * 3;
672 max_decomp_size = max_basesize / 2 * 3;
673 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
676 c->decomp_size = basesize * 2;
677 max_decomp_size = max_basesize * 2;
678 av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
681 c->decomp_size = basesize / 2 * 3;
682 max_decomp_size = max_basesize / 2 * 3;
683 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
686 av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
690 /* Detect compression method */
691 c->compression = *((char *)avctx->extradata + 5);
692 switch (avctx->codec_id) {
694 switch (c->compression) {
696 av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
698 case COMP_MSZH_NOCOMP:
700 av_log(avctx, AV_LOG_INFO, "No compression.\n");
703 av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
709 switch (c->compression) {
710 case COMP_ZLIB_HISPEED:
711 av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
713 case COMP_ZLIB_HICOMP:
714 av_log(avctx, AV_LOG_INFO, "High compression.\n");
716 case COMP_ZLIB_NORMAL:
717 av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
720 if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
721 av_log(avctx, AV_LOG_ERROR, "Unusupported compression level for ZLIB: (%d).\n", c->compression);
724 av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
727 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
732 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
736 /* Allocate decompression buffer */
737 if (c->decomp_size) {
738 if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
739 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
745 c->flags = *((char *)avctx->extradata + 6);
746 if (c->flags & FLAG_MULTITHREAD)
747 av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
748 if (c->flags & FLAG_NULLFRAME)
749 av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
750 if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
751 av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
752 if (c->flags & FLAGMASK_UNUSED)
753 av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
755 /* If needed init zlib */
756 if (avctx->codec_id == CODEC_ID_ZLIB) {
758 c->zstream.zalloc = Z_NULL;
759 c->zstream.zfree = Z_NULL;
760 c->zstream.opaque = Z_NULL;
761 zret = inflateInit(&(c->zstream));
763 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
767 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
772 avctx->pix_fmt = PIX_FMT_BGR24;
784 static int encode_init(AVCodecContext *avctx)
786 LclContext *c = avctx->priv_data;
787 int zret; // Zlib return code
790 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
796 assert(avctx->width && avctx->height);
798 avctx->extradata= av_mallocz(8);
799 avctx->coded_frame= &c->pic;
801 // Will be user settable someday
805 switch(avctx->pix_fmt){
807 c->imgtype = IMGTYPE_RGB24;
808 c->decomp_size = avctx->width * avctx->height * 3;
809 avctx->bits_per_sample= 24;
812 av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
816 ((uint8_t*)avctx->extradata)[0]= 4;
817 ((uint8_t*)avctx->extradata)[1]= 0;
818 ((uint8_t*)avctx->extradata)[2]= 0;
819 ((uint8_t*)avctx->extradata)[3]= 0;
820 ((uint8_t*)avctx->extradata)[4]= c->imgtype;
821 ((uint8_t*)avctx->extradata)[5]= c->compression;
822 ((uint8_t*)avctx->extradata)[6]= c->flags;
823 ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
824 c->avctx->extradata_size= 8;
826 c->zstream.zalloc = Z_NULL;
827 c->zstream.zfree = Z_NULL;
828 c->zstream.opaque = Z_NULL;
829 zret = deflateInit(&(c->zstream), c->compression);
831 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
835 /* Conservative upper bound taken from zlib v1.2.1 source */
836 c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
837 ((c->decomp_size + 63) >> 6) + 11;
838 if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
839 av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
856 static int decode_end(AVCodecContext *avctx)
858 LclContext * const c = (LclContext *)avctx->priv_data;
861 avctx->release_buffer(avctx, &c->pic);
863 inflateEnd(&(c->zstream));
876 static int encode_end(AVCodecContext *avctx)
878 LclContext *c = avctx->priv_data;
880 av_freep(&avctx->extradata);
881 av_freep(&c->comp_buf);
883 deflateEnd(&(c->zstream));
889 AVCodec mszh_decoder = {
902 AVCodec zlib_decoder = {
914 #ifdef CONFIG_ENCODERS
916 AVCodec zlib_encoder = {
924 // .options = lcl_options,
927 #endif //CONFIG_ENCODERS