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"
57 #define IMGTYPE_YUV111 0
58 #define IMGTYPE_YUV422 1
59 #define IMGTYPE_RGB24 2
60 #define IMGTYPE_YUV411 3
61 #define IMGTYPE_YUV211 4
62 #define IMGTYPE_YUV420 5
65 #define COMP_MSZH_NOCOMP 1
66 #define COMP_ZLIB_HISPEED 1
67 #define COMP_ZLIB_HICOMP 9
68 #define COMP_ZLIB_NORMAL -1
70 #define FLAG_MULTITHREAD 1
71 #define FLAG_NULLFRAME 2
72 #define FLAG_PNGFILTER 4
73 #define FLAGMASK_UNUSED 0xf8
78 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
79 #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
84 typedef struct LclContext {
86 AVCodecContext *avctx;
96 // Decompressed data size
97 unsigned int decomp_size;
98 // Decompression buffer
99 unsigned char* decomp_buf;
100 // Maximum compressed data size
101 unsigned int max_comp_size;
102 // Compression buffer
103 unsigned char* comp_buf;
115 static inline unsigned char fix (int pix14)
119 tmp = (pix14 + 0x80000) >> 20;
129 static inline unsigned char get_b (unsigned char yq, signed char bq)
131 return fix((yq << 20) + bq * 1858076);
136 static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
138 return fix((yq << 20) - bq * 360857 - rq * 748830);
143 static inline unsigned char get_r (unsigned char yq, signed char rq)
145 return fix((yq << 20) + rq * 1470103);
150 static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
152 unsigned char *destptr_bak = destptr;
153 unsigned char *destptr_end = destptr + destsize;
154 unsigned char mask = 0;
155 unsigned char maskbit = 0;
156 unsigned int ofs, cnt;
158 while ((srclen > 0) && (destptr < destptr_end)) {
165 if ((mask & (1 << (--maskbit))) == 0) {
166 if (destptr + 4 > destptr_end)
168 *(int*)destptr = *(int*)srcptr;
176 cnt = ((cnt >> 3) & 0x1f) + 1;
180 if (destptr + cnt > destptr_end) {
181 cnt = destptr_end - destptr;
183 for (; cnt > 0; cnt--) {
184 *(destptr) = *(destptr - ofs);
190 return (destptr - destptr_bak);
195 #ifdef CONFIG_DECODERS
201 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
203 LclContext * const c = (LclContext *)avctx->priv_data;
204 unsigned char *encoded = (unsigned char *)buf;
205 unsigned int pixel_ptr;
207 unsigned char *outptr;
208 unsigned int width = avctx->width; // Real image width
209 unsigned int height = avctx->height; // Real image height
210 unsigned int mszh_dlen;
211 unsigned char yq, y1q, uq, vq;
213 unsigned int mthread_inlen, mthread_outlen;
215 int zret; // Zlib return code
217 unsigned int len = buf_size;
220 avctx->release_buffer(avctx, &c->pic);
222 c->pic.reference = 0;
223 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
224 if(avctx->get_buffer(avctx, &c->pic) < 0){
225 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
229 outptr = c->pic.data[0]; // Output image pointer
231 /* Decompress frame */
232 switch (avctx->codec_id) {
234 switch (c->compression) {
236 if (c->flags & FLAG_MULTITHREAD) {
237 mthread_inlen = *((unsigned int*)encoded);
238 mthread_outlen = *((unsigned int*)(encoded+4));
239 if (mthread_outlen > c->decomp_size) // this should not happen
240 mthread_outlen = c->decomp_size;
241 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
242 if (mthread_outlen != mszh_dlen) {
243 av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
244 mthread_outlen, mszh_dlen);
247 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
248 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
249 if (mthread_outlen != mszh_dlen) {
250 av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
251 mthread_outlen, mszh_dlen);
254 encoded = c->decomp_buf;
255 len = c->decomp_size;
257 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
258 if (c->decomp_size != mszh_dlen) {
259 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
260 c->decomp_size, mszh_dlen);
263 encoded = c->decomp_buf;
267 case COMP_MSZH_NOCOMP:
270 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
276 /* Using the original dll with normal compression (-1) and RGB format
277 * gives a file with ZLIB fourcc, but frame is really uncompressed.
278 * To be sure that's true check also frame size */
279 if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
280 (len == width * height * 3))
282 zret = inflateReset(&(c->zstream));
284 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
287 if (c->flags & FLAG_MULTITHREAD) {
288 mthread_inlen = *((unsigned int*)encoded);
289 mthread_outlen = *((unsigned int*)(encoded+4));
290 if (mthread_outlen > c->decomp_size)
291 mthread_outlen = c->decomp_size;
292 c->zstream.next_in = encoded + 8;
293 c->zstream.avail_in = mthread_inlen;
294 c->zstream.next_out = c->decomp_buf;
295 c->zstream.avail_out = c->decomp_size;
296 zret = inflate(&(c->zstream), Z_FINISH);
297 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
298 av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
301 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
302 av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
303 mthread_outlen, c->zstream.total_out);
306 zret = inflateReset(&(c->zstream));
308 av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
311 c->zstream.next_in = encoded + 8 + mthread_inlen;
312 c->zstream.avail_in = len - mthread_inlen;
313 c->zstream.next_out = c->decomp_buf + mthread_outlen;
314 c->zstream.avail_out = c->decomp_size - mthread_outlen;
315 zret = inflate(&(c->zstream), Z_FINISH);
316 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
317 av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
320 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
321 av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
322 mthread_outlen, c->zstream.total_out);
326 c->zstream.next_in = encoded;
327 c->zstream.avail_in = len;
328 c->zstream.next_out = c->decomp_buf;
329 c->zstream.avail_out = c->decomp_size;
330 zret = inflate(&(c->zstream), Z_FINISH);
331 if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
332 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
335 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
336 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
337 c->decomp_size, c->zstream.total_out);
341 encoded = c->decomp_buf;
342 len = c->decomp_size;;
344 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
349 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
354 /* Apply PNG filter */
355 if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
356 switch (c->imgtype) {
359 for (row = 0; row < height; row++) {
360 pixel_ptr = row * width * 3;
361 yq = encoded[pixel_ptr++];
362 uqvq = encoded[pixel_ptr++];
363 uqvq+=(encoded[pixel_ptr++] << 8);
364 for (col = 1; col < width; col++) {
365 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
366 uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
367 encoded[pixel_ptr+1] = (uqvq) & 0xff;
368 encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
374 for (row = 0; row < height; row++) {
375 pixel_ptr = row * width * 2;
377 for (col = 0; col < width/4; col++) {
378 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
379 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
380 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
381 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
382 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
383 encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
384 encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
385 encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
391 for (row = 0; row < height; row++) {
392 pixel_ptr = row * width / 2 * 3;
394 for (col = 0; col < width/4; col++) {
395 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
396 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
397 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
398 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
399 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
400 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
406 for (row = 0; row < height; row++) {
407 pixel_ptr = row * width * 2;
409 for (col = 0; col < width/2; col++) {
410 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
411 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
412 encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
413 encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
419 for (row = 0; row < height/2; row++) {
420 pixel_ptr = row * width * 3;
421 yq = y1q = uq = vq =0;
422 for (col = 0; col < width/2; col++) {
423 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
424 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
425 encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
426 encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
427 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
428 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
434 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
439 /* Convert colorspace */
440 switch (c->imgtype) {
442 for (row = height - 1; row >= 0; row--) {
443 pixel_ptr = row * c->pic.linesize[0];
444 for (col = 0; col < width; col++) {
445 outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
446 outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
447 outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
453 for (row = height - 1; row >= 0; row--) {
454 pixel_ptr = row * c->pic.linesize[0];
455 for (col = 0; col < width/4; col++) {
456 outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
457 outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
458 outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
459 outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
460 outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
461 outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
462 outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
463 outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
464 outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
465 outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
466 outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
467 outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
473 for (row = height - 1; row >= 0; row--) {
474 pixel_ptr = row * c->pic.linesize[0];
475 for (col = 0; col < width; col++) {
476 outptr[pixel_ptr++] = encoded[0];
477 outptr[pixel_ptr++] = encoded[1];
478 outptr[pixel_ptr++] = encoded[2];
484 for (row = height - 1; row >= 0; row--) {
485 pixel_ptr = row * c->pic.linesize[0];
486 for (col = 0; col < width/4; col++) {
487 outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
488 outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
489 outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
490 outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
491 outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
492 outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
493 outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
494 outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
495 outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
496 outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
497 outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
498 outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
504 for (row = height - 1; row >= 0; row--) {
505 pixel_ptr = row * c->pic.linesize[0];
506 for (col = 0; col < width/2; col++) {
507 outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
508 outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
509 outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
510 outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
511 outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
512 outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
518 for (row = height / 2 - 1; row >= 0; row--) {
519 pixel_ptr = 2 * row * c->pic.linesize[0];
520 for (col = 0; col < width/2; col++) {
521 outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
522 outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
523 outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
524 outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
525 outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
526 outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
527 outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
528 outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
529 outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
530 outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
531 outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
532 outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
539 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
543 *data_size = sizeof(AVFrame);
544 *(AVFrame*)data = c->pic;
546 /* always report that the buffer was completely consumed */
551 #ifdef CONFIG_ENCODERS
557 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
558 LclContext *c = avctx->priv_data;
559 AVFrame *pict = data;
560 AVFrame * const p = &c->pic;
562 int zret; // Zlib return code
565 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
569 init_put_bits(&c->pb, buf, buf_size);
572 p->pict_type= FF_I_TYPE;
575 if(avctx->pix_fmt != PIX_FMT_BGR24){
576 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
580 zret = deflateReset(&(c->zstream));
582 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
585 c->zstream.next_out = c->comp_buf;
586 c->zstream.avail_out = c->max_comp_size;
588 for(i = avctx->height - 1; i >= 0; i--) {
589 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
590 c->zstream.avail_in = avctx->width*3;
591 zret = deflate(&(c->zstream), Z_NO_FLUSH);
593 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
597 zret = deflate(&(c->zstream), Z_FINISH);
598 if (zret != Z_STREAM_END) {
599 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
603 for (i = 0; i < c->zstream.total_out; i++)
604 put_bits(&c->pb, 8, c->comp_buf[i]);
605 flush_put_bits(&c->pb);
607 return c->zstream.total_out;
610 #endif /* CONFIG_ENCODERS */
612 #ifdef CONFIG_DECODERS
618 static int decode_init(AVCodecContext *avctx)
620 LclContext * const c = (LclContext *)avctx->priv_data;
621 unsigned int basesize = avctx->width * avctx->height;
622 unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
623 unsigned int max_decomp_size;
624 int zret; // Zlib return code
627 avctx->has_b_frames = 0;
629 c->pic.data[0] = NULL;
632 // Needed if zlib unused or init aborted before inflateInit
633 memset(&(c->zstream), 0, sizeof(z_stream));
636 if (avctx->extradata_size < 8) {
637 av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
641 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
645 /* Check codec type */
646 if (((avctx->codec_id == CODEC_ID_MSZH) && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
647 ((avctx->codec_id == CODEC_ID_ZLIB) && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
648 av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
651 /* Detect image type */
652 switch (c->imgtype = *((char *)avctx->extradata + 4)) {
654 c->decomp_size = basesize * 3;
655 max_decomp_size = max_basesize * 3;
656 av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
659 c->decomp_size = basesize * 2;
660 max_decomp_size = max_basesize * 2;
661 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
664 c->decomp_size = basesize * 3;
665 max_decomp_size = max_basesize * 3;
666 av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
669 c->decomp_size = basesize / 2 * 3;
670 max_decomp_size = max_basesize / 2 * 3;
671 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
674 c->decomp_size = basesize * 2;
675 max_decomp_size = max_basesize * 2;
676 av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
679 c->decomp_size = basesize / 2 * 3;
680 max_decomp_size = max_basesize / 2 * 3;
681 av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
684 av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
688 /* Detect compression method */
689 c->compression = *((char *)avctx->extradata + 5);
690 switch (avctx->codec_id) {
692 switch (c->compression) {
694 av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
696 case COMP_MSZH_NOCOMP:
698 av_log(avctx, AV_LOG_INFO, "No compression.\n");
701 av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
707 switch (c->compression) {
708 case COMP_ZLIB_HISPEED:
709 av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
711 case COMP_ZLIB_HICOMP:
712 av_log(avctx, AV_LOG_INFO, "High compression.\n");
714 case COMP_ZLIB_NORMAL:
715 av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
718 if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
719 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
722 av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
725 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
730 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
734 /* Allocate decompression buffer */
735 if (c->decomp_size) {
736 if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
737 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
743 c->flags = *((char *)avctx->extradata + 6);
744 if (c->flags & FLAG_MULTITHREAD)
745 av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
746 if (c->flags & FLAG_NULLFRAME)
747 av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
748 if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
749 av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
750 if (c->flags & FLAGMASK_UNUSED)
751 av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
753 /* If needed init zlib */
754 if (avctx->codec_id == CODEC_ID_ZLIB) {
756 c->zstream.zalloc = Z_NULL;
757 c->zstream.zfree = Z_NULL;
758 c->zstream.opaque = Z_NULL;
759 zret = inflateInit(&(c->zstream));
761 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
765 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
770 avctx->pix_fmt = PIX_FMT_BGR24;
774 #endif /* CONFIG_DECODERS */
776 #ifdef CONFIG_ENCODERS
782 static int encode_init(AVCodecContext *avctx)
784 LclContext *c = avctx->priv_data;
785 int zret; // Zlib return code
788 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
794 assert(avctx->width && avctx->height);
796 avctx->extradata= av_mallocz(8);
797 avctx->coded_frame= &c->pic;
799 // Will be user settable someday
803 switch(avctx->pix_fmt){
805 c->imgtype = IMGTYPE_RGB24;
806 c->decomp_size = avctx->width * avctx->height * 3;
807 avctx->bits_per_sample= 24;
810 av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
814 ((uint8_t*)avctx->extradata)[0]= 4;
815 ((uint8_t*)avctx->extradata)[1]= 0;
816 ((uint8_t*)avctx->extradata)[2]= 0;
817 ((uint8_t*)avctx->extradata)[3]= 0;
818 ((uint8_t*)avctx->extradata)[4]= c->imgtype;
819 ((uint8_t*)avctx->extradata)[5]= c->compression;
820 ((uint8_t*)avctx->extradata)[6]= c->flags;
821 ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
822 c->avctx->extradata_size= 8;
824 c->zstream.zalloc = Z_NULL;
825 c->zstream.zfree = Z_NULL;
826 c->zstream.opaque = Z_NULL;
827 zret = deflateInit(&(c->zstream), c->compression);
829 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
833 /* Conservative upper bound taken from zlib v1.2.1 source */
834 c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
835 ((c->decomp_size + 63) >> 6) + 11;
836 if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
837 av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
844 #endif /* CONFIG_ENCODERS */
848 #ifdef CONFIG_DECODERS
854 static int decode_end(AVCodecContext *avctx)
856 LclContext * const c = (LclContext *)avctx->priv_data;
859 avctx->release_buffer(avctx, &c->pic);
861 inflateEnd(&(c->zstream));
868 #ifdef CONFIG_ENCODERS
874 static int encode_end(AVCodecContext *avctx)
876 LclContext *c = avctx->priv_data;
878 av_freep(&avctx->extradata);
879 av_freep(&c->comp_buf);
881 deflateEnd(&(c->zstream));
888 #ifdef CONFIG_MSZH_DECODER
889 AVCodec mszh_decoder = {
902 #ifdef CONFIG_ZLIB_DECODER
903 AVCodec zlib_decoder = {
916 #ifdef CONFIG_ENCODERS
918 AVCodec zlib_encoder = {
928 #endif //CONFIG_ENCODERS