2 * LCL (LossLess Codec Library) Codec
3 * Copyright (c) 2002-2004 Roberto Togni
5 * This file is part of FFmpeg.
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.
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.
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
25 * LCL (LossLess Codec Library) Video Codec
26 * Decoder for MSZH and ZLIB codecs
27 * Experimental encoder for ZLIB RGB24
32 * Ver2.23 By Kenji Oshima 2000.09.20
33 * avimszh.dll, avizlib.dll
35 * A description of the decoding algorithm can be found here:
36 * http://www.pcisys.net/~melanson/codecs
38 * Supports: BGR24 (RGB 24bpp)
46 #include "bitstream.h"
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
64 #define COMP_MSZH_NOCOMP 1
65 #define COMP_ZLIB_HISPEED 1
66 #define COMP_ZLIB_HICOMP 9
67 #define COMP_ZLIB_NORMAL -1
69 #define FLAG_MULTITHREAD 1
70 #define FLAG_NULLFRAME 2
71 #define FLAG_PNGFILTER 4
72 #define FLAGMASK_UNUSED 0xf8
77 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
78 #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
83 typedef struct LclContext {
85 AVCodecContext *avctx;
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;
114 static inline unsigned char fix (int pix14)
118 tmp = (pix14 + 0x80000) >> 20;
128 static inline unsigned char get_b (unsigned char yq, signed char bq)
130 return fix((yq << 20) + bq * 1858076);
135 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
137 return fix((yq << 20) - bq * 360857 - rq * 748830);
142 static inline unsigned char get_r (unsigned char yq, signed char rq)
144 return fix((yq << 20) + rq * 1470103);
149 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
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;
157 while ((srclen > 0) && (destptr < destptr_end)) {
164 if ((mask & (1 << (--maskbit))) == 0) {
165 if (destptr + 4 > destptr_end)
167 *(int*)destptr = *(int*)srcptr;
175 cnt = ((cnt >> 3) & 0x1f) + 1;
179 if (destptr + cnt > destptr_end) {
180 cnt = destptr_end - destptr;
182 for (; cnt > 0; cnt--) {
183 *(destptr) = *(destptr - ofs);
189 return (destptr - destptr_bak);
194 #ifdef CONFIG_DECODERS
200 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
202 LclContext * const c = avctx->priv_data;
203 unsigned char *encoded = (unsigned char *)buf;
204 unsigned int pixel_ptr;
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;
212 unsigned int mthread_inlen, mthread_outlen;
214 int zret; // Zlib return code
216 unsigned int len = buf_size;
219 avctx->release_buffer(avctx, &c->pic);
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");
228 outptr = c->pic.data[0]; // Output image pointer
230 /* Decompress frame */
231 switch (avctx->codec_id) {
233 switch (c->compression) {
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);
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);
253 encoded = c->decomp_buf;
254 len = c->decomp_size;
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);
262 encoded = c->decomp_buf;
266 case COMP_MSZH_NOCOMP:
269 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
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))
281 zret = inflateReset(&(c->zstream));
283 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
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);
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);
305 zret = inflateReset(&(c->zstream));
307 av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
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);
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);
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);
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);
340 encoded = c->decomp_buf;
341 len = c->decomp_size;;
343 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
348 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
353 /* Apply PNG filter */
354 if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
355 switch (c->imgtype) {
358 for (row = 0; row < height; row++) {
359 pixel_ptr = row * width * 3;
360 yq = encoded[pixel_ptr++];
361 uqvq = AV_RL16(encoded+pixel_ptr);
363 for (col = 1; col < width; col++) {
364 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
365 uqvq -= AV_RL16(encoded+pixel_ptr+1);
366 AV_WL16(encoded+pixel_ptr+1, uqvq);
372 for (row = 0; row < height; row++) {
373 pixel_ptr = row * width * 2;
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];
389 for (row = 0; row < height; row++) {
390 pixel_ptr = row * width / 2 * 3;
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];
404 for (row = 0; row < height; row++) {
405 pixel_ptr = row * width * 2;
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];
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];
432 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
437 /* Convert colorspace */
438 switch (c->imgtype) {
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]);
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]);
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];
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]);
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]);
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]);
537 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
541 *data_size = sizeof(AVFrame);
542 *(AVFrame*)data = c->pic;
544 /* always report that the buffer was completely consumed */
549 #ifdef CONFIG_ENCODERS
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;
560 int zret; // Zlib return code
563 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
567 init_put_bits(&c->pb, buf, buf_size);
570 p->pict_type= FF_I_TYPE;
573 if(avctx->pix_fmt != PIX_FMT_BGR24){
574 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
578 zret = deflateReset(&(c->zstream));
580 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
583 c->zstream.next_out = c->comp_buf;
584 c->zstream.avail_out = c->max_comp_size;
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);
591 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
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);
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);
605 return c->zstream.total_out;
608 #endif /* CONFIG_ENCODERS */
610 #ifdef CONFIG_DECODERS
616 static int decode_init(AVCodecContext *avctx)
618 LclContext * const c = 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
626 c->pic.data[0] = NULL;
629 // Needed if zlib unused or init aborted before inflateInit
630 memset(&(c->zstream), 0, sizeof(z_stream));
633 if (avctx->extradata_size < 8) {
634 av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
638 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
642 /* Check codec type */
643 if (((avctx->codec_id == CODEC_ID_MSZH) && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
644 ((avctx->codec_id == CODEC_ID_ZLIB) && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
645 av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
648 /* Detect image type */
649 switch (c->imgtype = *((char *)avctx->extradata + 4)) {
651 c->decomp_size = basesize * 3;
652 max_decomp_size = max_basesize * 3;
653 av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
656 c->decomp_size = basesize * 2;
657 max_decomp_size = max_basesize * 2;
658 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
661 c->decomp_size = basesize * 3;
662 max_decomp_size = max_basesize * 3;
663 av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
666 c->decomp_size = basesize / 2 * 3;
667 max_decomp_size = max_basesize / 2 * 3;
668 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
671 c->decomp_size = basesize * 2;
672 max_decomp_size = max_basesize * 2;
673 av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
676 c->decomp_size = basesize / 2 * 3;
677 max_decomp_size = max_basesize / 2 * 3;
678 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
681 av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
685 /* Detect compression method */
686 c->compression = *((char *)avctx->extradata + 5);
687 switch (avctx->codec_id) {
689 switch (c->compression) {
691 av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
693 case COMP_MSZH_NOCOMP:
695 av_log(avctx, AV_LOG_INFO, "No compression.\n");
698 av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
704 switch (c->compression) {
705 case COMP_ZLIB_HISPEED:
706 av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
708 case COMP_ZLIB_HICOMP:
709 av_log(avctx, AV_LOG_INFO, "High compression.\n");
711 case COMP_ZLIB_NORMAL:
712 av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
715 if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
716 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
719 av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
722 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
727 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
731 /* Allocate decompression buffer */
732 if (c->decomp_size) {
733 if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
734 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
740 c->flags = *((char *)avctx->extradata + 6);
741 if (c->flags & FLAG_MULTITHREAD)
742 av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
743 if (c->flags & FLAG_NULLFRAME)
744 av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
745 if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
746 av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
747 if (c->flags & FLAGMASK_UNUSED)
748 av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
750 /* If needed init zlib */
751 if (avctx->codec_id == CODEC_ID_ZLIB) {
753 c->zstream.zalloc = Z_NULL;
754 c->zstream.zfree = Z_NULL;
755 c->zstream.opaque = Z_NULL;
756 zret = inflateInit(&(c->zstream));
758 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
762 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
767 avctx->pix_fmt = PIX_FMT_BGR24;
771 #endif /* CONFIG_DECODERS */
773 #ifdef CONFIG_ENCODERS
779 static int encode_init(AVCodecContext *avctx)
781 LclContext *c = avctx->priv_data;
782 int zret; // Zlib return code
785 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
791 assert(avctx->width && avctx->height);
793 avctx->extradata= av_mallocz(8);
794 avctx->coded_frame= &c->pic;
796 // Will be user settable someday
800 switch(avctx->pix_fmt){
802 c->imgtype = IMGTYPE_RGB24;
803 c->decomp_size = avctx->width * avctx->height * 3;
804 avctx->bits_per_sample= 24;
807 av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
811 ((uint8_t*)avctx->extradata)[0]= 4;
812 ((uint8_t*)avctx->extradata)[1]= 0;
813 ((uint8_t*)avctx->extradata)[2]= 0;
814 ((uint8_t*)avctx->extradata)[3]= 0;
815 ((uint8_t*)avctx->extradata)[4]= c->imgtype;
816 ((uint8_t*)avctx->extradata)[5]= c->compression;
817 ((uint8_t*)avctx->extradata)[6]= c->flags;
818 ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
819 c->avctx->extradata_size= 8;
821 c->zstream.zalloc = Z_NULL;
822 c->zstream.zfree = Z_NULL;
823 c->zstream.opaque = Z_NULL;
824 zret = deflateInit(&(c->zstream), c->compression);
826 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
830 /* Conservative upper bound taken from zlib v1.2.1 source */
831 c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
832 ((c->decomp_size + 63) >> 6) + 11;
833 if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
834 av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
841 #endif /* CONFIG_ENCODERS */
845 #ifdef CONFIG_DECODERS
851 static int decode_end(AVCodecContext *avctx)
853 LclContext * const c = avctx->priv_data;
856 avctx->release_buffer(avctx, &c->pic);
858 inflateEnd(&(c->zstream));
865 #ifdef CONFIG_ENCODERS
871 static int encode_end(AVCodecContext *avctx)
873 LclContext *c = avctx->priv_data;
875 av_freep(&avctx->extradata);
876 av_freep(&c->comp_buf);
878 deflateEnd(&(c->zstream));
885 #ifdef CONFIG_MSZH_DECODER
886 AVCodec mszh_decoder = {
899 #ifdef CONFIG_ZLIB_DECODER
900 AVCodec zlib_decoder = {
913 #ifdef CONFIG_ENCODERS
915 AVCodec zlib_encoder = {
925 #endif //CONFIG_ENCODERS