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
24 * LCL (LossLess Codec Library) Video Codec
25 * Decoder for MSZH and ZLIB codecs
26 * Experimental encoder for ZLIB RGB24
31 * Ver2.23 By Kenji Oshima 2000.09.20
32 * avimszh.dll, avizlib.dll
34 * A description of the decoding algorithm can be found here:
35 * http://www.pcisys.net/~melanson/codecs
37 * Supports: BGR24 (RGB 24bpp)
44 #include "libavutil/mem.h"
45 #include "libavutil/pixdesc.h"
47 #include "bytestream.h"
51 #if CONFIG_ZLIB_DECODER
58 typedef struct LclDecContext
{
65 // Decompressed data size
66 unsigned int decomp_size
;
67 // Decompression buffer
68 unsigned char* decomp_buf
;
69 #if CONFIG_ZLIB_DECODER
76 * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
77 * @param destptr must be padded sufficiently for av_memcpy_backptr
79 static unsigned int mszh_decomp(const unsigned char * srcptr
, int srclen
, unsigned char * destptr
, unsigned int destsize
)
81 unsigned char *destptr_bak
= destptr
;
82 unsigned char *destptr_end
= destptr
+ destsize
;
83 const unsigned char *srcptr_end
= srcptr
+ srclen
;
84 unsigned mask
= *srcptr
++;
85 unsigned maskbit
= 0x80;
87 while (srcptr
< srcptr_end
&& destptr
< destptr_end
) {
88 if (!(mask
& maskbit
)) {
89 memcpy(destptr
, srcptr
, 4);
93 unsigned ofs
= bytestream_get_le16(&srcptr
);
94 unsigned cnt
= (ofs
>> 11) + 1;
96 ofs
= FFMIN(ofs
, destptr
- destptr_bak
);
98 cnt
= FFMIN(cnt
, destptr_end
- destptr
);
100 av_memcpy_backptr(destptr
, ofs
, cnt
);
102 // Not known what the correct behaviour is, but
103 // this at least avoids uninitialized data.
104 memset(destptr
, 0, cnt
);
112 if (destptr_end
- destptr
< 32 || srcptr_end
- srcptr
< 32) break;
113 memcpy(destptr
, srcptr
, 32);
122 return destptr
- destptr_bak
;
126 #if CONFIG_ZLIB_DECODER
128 * @brief decompress a zlib-compressed data block into decomp_buf
129 * @param src compressed input buffer
130 * @param src_len data length in input buffer
131 * @param offset offset in decomp_buf
132 * @param expected expected decompressed length
134 static int zlib_decomp(AVCodecContext
*avctx
, const uint8_t *src
, int src_len
, int offset
, int expected
)
136 LclDecContext
*c
= avctx
->priv_data
;
137 int zret
= inflateReset(&c
->zstream
);
139 av_log(avctx
, AV_LOG_ERROR
, "Inflate reset error: %d\n", zret
);
140 return AVERROR_UNKNOWN
;
142 c
->zstream
.next_in
= (uint8_t *)src
;
143 c
->zstream
.avail_in
= src_len
;
144 c
->zstream
.next_out
= c
->decomp_buf
+ offset
;
145 c
->zstream
.avail_out
= c
->decomp_size
- offset
;
146 zret
= inflate(&c
->zstream
, Z_FINISH
);
147 if (zret
!= Z_OK
&& zret
!= Z_STREAM_END
) {
148 av_log(avctx
, AV_LOG_ERROR
, "Inflate error: %d\n", zret
);
149 return AVERROR_UNKNOWN
;
151 if (expected
!= (unsigned int)c
->zstream
.total_out
) {
152 av_log(avctx
, AV_LOG_ERROR
, "Decoded size differs (%d != %lu)\n",
153 expected
, c
->zstream
.total_out
);
154 return AVERROR_UNKNOWN
;
156 return c
->zstream
.total_out
;
166 static int decode_frame(AVCodecContext
*avctx
, void *data
, int *got_frame
, AVPacket
*avpkt
)
168 AVFrame
*frame
= data
;
169 const uint8_t *buf
= avpkt
->data
;
170 int buf_size
= avpkt
->size
;
171 LclDecContext
* const c
= avctx
->priv_data
;
172 unsigned int pixel_ptr
;
174 unsigned char *encoded
= avpkt
->data
, *outptr
;
175 uint8_t *y_out
, *u_out
, *v_out
;
176 unsigned int width
= avctx
->width
; // Real image width
177 unsigned int height
= avctx
->height
; // Real image height
178 unsigned int mszh_dlen
;
179 unsigned char yq
, y1q
, uq
, vq
;
181 unsigned int mthread_inlen
, mthread_outlen
;
182 unsigned int len
= buf_size
;
184 if ((ret
= ff_get_buffer(avctx
, frame
, 0)) < 0)
187 outptr
= frame
->data
[0]; // Output image pointer
189 /* Decompress frame */
190 switch (avctx
->codec_id
) {
191 case AV_CODEC_ID_MSZH
:
192 switch (c
->compression
) {
194 if (c
->imgtype
== IMGTYPE_RGB24
&& len
== width
* height
* 3 ||
195 c
->imgtype
== IMGTYPE_YUV111
&& len
== width
* height
* 3) {
197 } else if (c
->flags
& FLAG_MULTITHREAD
) {
198 mthread_inlen
= AV_RL32(buf
);
200 av_log(avctx
, AV_LOG_ERROR
, "len %d is too small\n", len
);
201 return AVERROR_INVALIDDATA
;
203 mthread_inlen
= FFMIN(mthread_inlen
, len
- 8);
204 mthread_outlen
= AV_RL32(buf
+ 4);
205 mthread_outlen
= FFMIN(mthread_outlen
, c
->decomp_size
);
206 mszh_dlen
= mszh_decomp(buf
+ 8, mthread_inlen
, c
->decomp_buf
, c
->decomp_size
);
207 if (mthread_outlen
!= mszh_dlen
) {
208 av_log(avctx
, AV_LOG_ERROR
, "Mthread1 decoded size differs (%d != %d)\n",
209 mthread_outlen
, mszh_dlen
);
210 return AVERROR_INVALIDDATA
;
212 mszh_dlen
= mszh_decomp(buf
+ 8 + mthread_inlen
, len
- 8 - mthread_inlen
,
213 c
->decomp_buf
+ mthread_outlen
, c
->decomp_size
- mthread_outlen
);
214 if (mthread_outlen
!= mszh_dlen
) {
215 av_log(avctx
, AV_LOG_ERROR
, "Mthread2 decoded size differs (%d != %d)\n",
216 mthread_outlen
, mszh_dlen
);
217 return AVERROR_INVALIDDATA
;
219 encoded
= c
->decomp_buf
;
220 len
= c
->decomp_size
;
222 mszh_dlen
= mszh_decomp(buf
, len
, c
->decomp_buf
, c
->decomp_size
);
223 if (c
->decomp_size
!= mszh_dlen
) {
224 av_log(avctx
, AV_LOG_ERROR
, "Decoded size differs (%d != %d)\n",
225 c
->decomp_size
, mszh_dlen
);
226 return AVERROR_INVALIDDATA
;
228 encoded
= c
->decomp_buf
;
232 case COMP_MSZH_NOCOMP
: {
234 switch (c
->imgtype
) {
248 bppx2
= 0; // will error out below
251 if (len
< ((width
* height
* bppx2
) >> 1))
252 return AVERROR_INVALIDDATA
;
256 av_log(avctx
, AV_LOG_ERROR
, "BUG! Unknown MSZH compression in frame decoder.\n");
257 return AVERROR_INVALIDDATA
;
260 #if CONFIG_ZLIB_DECODER
261 case AV_CODEC_ID_ZLIB
:
262 /* Using the original dll with normal compression (-1) and RGB format
263 * gives a file with ZLIB fourcc, but frame is really uncompressed.
264 * To be sure that's true check also frame size */
265 if (c
->compression
== COMP_ZLIB_NORMAL
&& c
->imgtype
== IMGTYPE_RGB24
&&
266 len
== width
* height
* 3) {
267 if (c
->flags
& FLAG_PNGFILTER
) {
268 memcpy(c
->decomp_buf
, buf
, len
);
269 encoded
= c
->decomp_buf
;
273 } else if (c
->flags
& FLAG_MULTITHREAD
) {
274 mthread_inlen
= AV_RL32(buf
);
275 mthread_inlen
= FFMIN(mthread_inlen
, len
- 8);
276 mthread_outlen
= AV_RL32(buf
+ 4);
277 mthread_outlen
= FFMIN(mthread_outlen
, c
->decomp_size
);
278 ret
= zlib_decomp(avctx
, buf
+ 8, mthread_inlen
, 0, mthread_outlen
);
279 if (ret
< 0) return ret
;
280 ret
= zlib_decomp(avctx
, buf
+ 8 + mthread_inlen
, len
- 8 - mthread_inlen
,
281 mthread_outlen
, mthread_outlen
);
282 if (ret
< 0) return ret
;
284 int ret
= zlib_decomp(avctx
, buf
, len
, 0, c
->decomp_size
);
285 if (ret
< 0) return ret
;
287 encoded
= c
->decomp_buf
;
288 len
= c
->decomp_size
;
292 av_log(avctx
, AV_LOG_ERROR
, "BUG! Unknown codec in frame decoder compression switch.\n");
293 return AVERROR_INVALIDDATA
;
297 /* Apply PNG filter */
298 if (avctx
->codec_id
== AV_CODEC_ID_ZLIB
&& (c
->flags
& FLAG_PNGFILTER
)) {
299 switch (c
->imgtype
) {
302 for (row
= 0; row
< height
; row
++) {
303 pixel_ptr
= row
* width
* 3;
304 yq
= encoded
[pixel_ptr
++];
305 uqvq
= AV_RL16(encoded
+pixel_ptr
);
307 for (col
= 1; col
< width
; col
++) {
308 encoded
[pixel_ptr
] = yq
-= encoded
[pixel_ptr
];
309 uqvq
-= AV_RL16(encoded
+pixel_ptr
+1);
310 AV_WL16(encoded
+pixel_ptr
+1, uqvq
);
316 for (row
= 0; row
< height
; row
++) {
317 pixel_ptr
= row
* width
* 2;
319 for (col
= 0; col
< width
/4; col
++) {
320 encoded
[pixel_ptr
] = yq
-= encoded
[pixel_ptr
];
321 encoded
[pixel_ptr
+1] = yq
-= encoded
[pixel_ptr
+1];
322 encoded
[pixel_ptr
+2] = yq
-= encoded
[pixel_ptr
+2];
323 encoded
[pixel_ptr
+3] = yq
-= encoded
[pixel_ptr
+3];
324 encoded
[pixel_ptr
+4] = uq
-= encoded
[pixel_ptr
+4];
325 encoded
[pixel_ptr
+5] = uq
-= encoded
[pixel_ptr
+5];
326 encoded
[pixel_ptr
+6] = vq
-= encoded
[pixel_ptr
+6];
327 encoded
[pixel_ptr
+7] = vq
-= encoded
[pixel_ptr
+7];
333 for (row
= 0; row
< height
; row
++) {
334 pixel_ptr
= row
* width
/ 2 * 3;
336 for (col
= 0; col
< width
/4; col
++) {
337 encoded
[pixel_ptr
] = yq
-= encoded
[pixel_ptr
];
338 encoded
[pixel_ptr
+1] = yq
-= encoded
[pixel_ptr
+1];
339 encoded
[pixel_ptr
+2] = yq
-= encoded
[pixel_ptr
+2];
340 encoded
[pixel_ptr
+3] = yq
-= encoded
[pixel_ptr
+3];
341 encoded
[pixel_ptr
+4] = uq
-= encoded
[pixel_ptr
+4];
342 encoded
[pixel_ptr
+5] = vq
-= encoded
[pixel_ptr
+5];
348 for (row
= 0; row
< height
; row
++) {
349 pixel_ptr
= row
* width
* 2;
351 for (col
= 0; col
< width
/2; col
++) {
352 encoded
[pixel_ptr
] = yq
-= encoded
[pixel_ptr
];
353 encoded
[pixel_ptr
+1] = yq
-= encoded
[pixel_ptr
+1];
354 encoded
[pixel_ptr
+2] = uq
-= encoded
[pixel_ptr
+2];
355 encoded
[pixel_ptr
+3] = vq
-= encoded
[pixel_ptr
+3];
361 for (row
= 0; row
< height
/2; row
++) {
362 pixel_ptr
= row
* width
* 3;
363 yq
= y1q
= uq
= vq
=0;
364 for (col
= 0; col
< width
/2; col
++) {
365 encoded
[pixel_ptr
] = yq
-= encoded
[pixel_ptr
];
366 encoded
[pixel_ptr
+1] = yq
-= encoded
[pixel_ptr
+1];
367 encoded
[pixel_ptr
+2] = y1q
-= encoded
[pixel_ptr
+2];
368 encoded
[pixel_ptr
+3] = y1q
-= encoded
[pixel_ptr
+3];
369 encoded
[pixel_ptr
+4] = uq
-= encoded
[pixel_ptr
+4];
370 encoded
[pixel_ptr
+5] = vq
-= encoded
[pixel_ptr
+5];
376 av_log(avctx
, AV_LOG_ERROR
, "BUG! Unknown imagetype in pngfilter switch.\n");
377 return AVERROR_INVALIDDATA
;
381 /* Convert colorspace */
382 y_out
= frame
->data
[0] + (height
- 1) * frame
->linesize
[0];
383 u_out
= frame
->data
[1] + (height
- 1) * frame
->linesize
[1];
384 v_out
= frame
->data
[2] + (height
- 1) * frame
->linesize
[2];
385 switch (c
->imgtype
) {
387 for (row
= 0; row
< height
; row
++) {
388 for (col
= 0; col
< width
; col
++) {
389 y_out
[col
] = *encoded
++;
390 u_out
[col
] = *encoded
++ + 128;
391 v_out
[col
] = *encoded
++ + 128;
393 y_out
-= frame
->linesize
[0];
394 u_out
-= frame
->linesize
[1];
395 v_out
-= frame
->linesize
[2];
399 for (row
= 0; row
< height
; row
++) {
400 for (col
= 0; col
< width
- 3; col
+= 4) {
401 memcpy(y_out
+ col
, encoded
, 4);
403 u_out
[ col
>> 1 ] = *encoded
++ + 128;
404 u_out
[(col
>> 1) + 1] = *encoded
++ + 128;
405 v_out
[ col
>> 1 ] = *encoded
++ + 128;
406 v_out
[(col
>> 1) + 1] = *encoded
++ + 128;
408 y_out
-= frame
->linesize
[0];
409 u_out
-= frame
->linesize
[1];
410 v_out
-= frame
->linesize
[2];
414 for (row
= height
- 1; row
>= 0; row
--) {
415 pixel_ptr
= row
* frame
->linesize
[0];
416 memcpy(outptr
+ pixel_ptr
, encoded
, 3 * width
);
417 encoded
+= 3 * width
;
421 for (row
= 0; row
< height
; row
++) {
422 for (col
= 0; col
< width
- 3; col
+= 4) {
423 memcpy(y_out
+ col
, encoded
, 4);
425 u_out
[col
>> 2] = *encoded
++ + 128;
426 v_out
[col
>> 2] = *encoded
++ + 128;
428 y_out
-= frame
->linesize
[0];
429 u_out
-= frame
->linesize
[1];
430 v_out
-= frame
->linesize
[2];
434 for (row
= 0; row
< height
; row
++) {
435 for (col
= 0; col
< width
- 1; col
+= 2) {
436 memcpy(y_out
+ col
, encoded
, 2);
438 u_out
[col
>> 1] = *encoded
++ + 128;
439 v_out
[col
>> 1] = *encoded
++ + 128;
441 y_out
-= frame
->linesize
[0];
442 u_out
-= frame
->linesize
[1];
443 v_out
-= frame
->linesize
[2];
447 u_out
= frame
->data
[1] + ((height
>> 1) - 1) * frame
->linesize
[1];
448 v_out
= frame
->data
[2] + ((height
>> 1) - 1) * frame
->linesize
[2];
449 for (row
= 0; row
< height
- 1; row
+= 2) {
450 for (col
= 0; col
< width
- 1; col
+= 2) {
451 memcpy(y_out
+ col
, encoded
, 2);
453 memcpy(y_out
+ col
- frame
->linesize
[0], encoded
, 2);
455 u_out
[col
>> 1] = *encoded
++ + 128;
456 v_out
[col
>> 1] = *encoded
++ + 128;
458 y_out
-= frame
->linesize
[0] << 1;
459 u_out
-= frame
->linesize
[1];
460 v_out
-= frame
->linesize
[2];
464 av_log(avctx
, AV_LOG_ERROR
, "BUG! Unknown imagetype in image decoder.\n");
465 return AVERROR_INVALIDDATA
;
470 /* always report that the buffer was completely consumed */
479 static av_cold
int decode_init(AVCodecContext
*avctx
)
481 LclDecContext
* const c
= avctx
->priv_data
;
482 unsigned int basesize
= avctx
->width
* avctx
->height
;
483 unsigned int max_basesize
= FFALIGN(avctx
->width
, 4) *
484 FFALIGN(avctx
->height
, 4);
485 unsigned int max_decomp_size
;
486 int subsample_h
, subsample_v
;
488 if (avctx
->extradata_size
< 8) {
489 av_log(avctx
, AV_LOG_ERROR
, "Extradata size too small.\n");
490 return AVERROR_INVALIDDATA
;
493 /* Check codec type */
494 if ((avctx
->codec_id
== AV_CODEC_ID_MSZH
&& avctx
->extradata
[7] != CODEC_MSZH
) ||
495 (avctx
->codec_id
== AV_CODEC_ID_ZLIB
&& avctx
->extradata
[7] != CODEC_ZLIB
)) {
496 av_log(avctx
, AV_LOG_ERROR
, "Codec id and codec type mismatch. This should not happen.\n");
499 /* Detect image type */
500 switch (c
->imgtype
= avctx
->extradata
[4]) {
502 c
->decomp_size
= basesize
* 3;
503 max_decomp_size
= max_basesize
* 3;
504 avctx
->pix_fmt
= AV_PIX_FMT_YUV444P
;
505 av_log(avctx
, AV_LOG_DEBUG
, "Image type is YUV 1:1:1.\n");
508 c
->decomp_size
= basesize
* 2;
509 max_decomp_size
= max_basesize
* 2;
510 avctx
->pix_fmt
= AV_PIX_FMT_YUV422P
;
511 av_log(avctx
, AV_LOG_DEBUG
, "Image type is YUV 4:2:2.\n");
512 if (avctx
->width
% 4) {
513 avpriv_request_sample(avctx
, "Unsupported dimensions\n");
514 return AVERROR_INVALIDDATA
;
518 c
->decomp_size
= basesize
* 3;
519 max_decomp_size
= max_basesize
* 3;
520 avctx
->pix_fmt
= AV_PIX_FMT_BGR24
;
521 av_log(avctx
, AV_LOG_DEBUG
, "Image type is RGB 24.\n");
524 c
->decomp_size
= basesize
/ 2 * 3;
525 max_decomp_size
= max_basesize
/ 2 * 3;
526 avctx
->pix_fmt
= AV_PIX_FMT_YUV411P
;
527 av_log(avctx
, AV_LOG_DEBUG
, "Image type is YUV 4:1:1.\n");
530 c
->decomp_size
= basesize
* 2;
531 max_decomp_size
= max_basesize
* 2;
532 avctx
->pix_fmt
= AV_PIX_FMT_YUV422P
;
533 av_log(avctx
, AV_LOG_DEBUG
, "Image type is YUV 2:1:1.\n");
536 c
->decomp_size
= basesize
/ 2 * 3;
537 max_decomp_size
= max_basesize
/ 2 * 3;
538 avctx
->pix_fmt
= AV_PIX_FMT_YUV420P
;
539 av_log(avctx
, AV_LOG_DEBUG
, "Image type is YUV 4:2:0.\n");
542 av_log(avctx
, AV_LOG_ERROR
, "Unsupported image format %d.\n", c
->imgtype
);
543 return AVERROR_INVALIDDATA
;
546 av_pix_fmt_get_chroma_sub_sample(avctx
->pix_fmt
, &subsample_h
, &subsample_v
);
547 if (avctx
->width
% (1<<subsample_h
) || avctx
->height
% (1<<subsample_v
)) {
548 avpriv_request_sample(avctx
, "Unsupported dimensions\n");
549 return AVERROR_INVALIDDATA
;
552 /* Detect compression method */
553 c
->compression
= (int8_t)avctx
->extradata
[5];
554 switch (avctx
->codec_id
) {
555 case AV_CODEC_ID_MSZH
:
556 switch (c
->compression
) {
558 av_log(avctx
, AV_LOG_DEBUG
, "Compression enabled.\n");
560 case COMP_MSZH_NOCOMP
:
562 av_log(avctx
, AV_LOG_DEBUG
, "No compression.\n");
565 av_log(avctx
, AV_LOG_ERROR
, "Unsupported compression format for MSZH (%d).\n", c
->compression
);
566 return AVERROR_INVALIDDATA
;
569 #if CONFIG_ZLIB_DECODER
570 case AV_CODEC_ID_ZLIB
:
571 switch (c
->compression
) {
572 case COMP_ZLIB_HISPEED
:
573 av_log(avctx
, AV_LOG_DEBUG
, "High speed compression.\n");
575 case COMP_ZLIB_HICOMP
:
576 av_log(avctx
, AV_LOG_DEBUG
, "High compression.\n");
578 case COMP_ZLIB_NORMAL
:
579 av_log(avctx
, AV_LOG_DEBUG
, "Normal compression.\n");
582 if (c
->compression
< Z_NO_COMPRESSION
|| c
->compression
> Z_BEST_COMPRESSION
) {
583 av_log(avctx
, AV_LOG_ERROR
, "Unsupported compression level for ZLIB: (%d).\n", c
->compression
);
584 return AVERROR_INVALIDDATA
;
586 av_log(avctx
, AV_LOG_DEBUG
, "Compression level for ZLIB: (%d).\n", c
->compression
);
591 av_log(avctx
, AV_LOG_ERROR
, "BUG! Unknown codec in compression switch.\n");
592 return AVERROR_INVALIDDATA
;
595 /* Allocate decompression buffer */
596 if (c
->decomp_size
) {
597 if (!(c
->decomp_buf
= av_malloc(max_decomp_size
))) {
598 av_log(avctx
, AV_LOG_ERROR
, "Can't allocate decompression buffer.\n");
599 return AVERROR(ENOMEM
);
604 c
->flags
= avctx
->extradata
[6];
605 if (c
->flags
& FLAG_MULTITHREAD
)
606 av_log(avctx
, AV_LOG_DEBUG
, "Multithread encoder flag set.\n");
607 if (c
->flags
& FLAG_NULLFRAME
)
608 av_log(avctx
, AV_LOG_DEBUG
, "Nullframe insertion flag set.\n");
609 if (avctx
->codec_id
== AV_CODEC_ID_ZLIB
&& (c
->flags
& FLAG_PNGFILTER
))
610 av_log(avctx
, AV_LOG_DEBUG
, "PNG filter flag set.\n");
611 if (c
->flags
& FLAGMASK_UNUSED
)
612 av_log(avctx
, AV_LOG_ERROR
, "Unknown flag set (%d).\n", c
->flags
);
614 /* If needed init zlib */
615 #if CONFIG_ZLIB_DECODER
616 if (avctx
->codec_id
== AV_CODEC_ID_ZLIB
) {
618 c
->zstream
.zalloc
= Z_NULL
;
619 c
->zstream
.zfree
= Z_NULL
;
620 c
->zstream
.opaque
= Z_NULL
;
621 zret
= inflateInit(&c
->zstream
);
623 av_log(avctx
, AV_LOG_ERROR
, "Inflate init error: %d\n", zret
);
624 av_freep(&c
->decomp_buf
);
625 return AVERROR_UNKNOWN
;
638 static av_cold
int decode_end(AVCodecContext
*avctx
)
640 LclDecContext
* const c
= avctx
->priv_data
;
642 av_freep(&c
->decomp_buf
);
643 #if CONFIG_ZLIB_DECODER
644 if (avctx
->codec_id
== AV_CODEC_ID_ZLIB
)
645 inflateEnd(&c
->zstream
);
651 #if CONFIG_MSZH_DECODER
652 AVCodec ff_mszh_decoder
= {
654 .long_name
= NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
655 .type
= AVMEDIA_TYPE_VIDEO
,
656 .id
= AV_CODEC_ID_MSZH
,
657 .priv_data_size
= sizeof(LclDecContext
),
660 .decode
= decode_frame
,
661 .capabilities
= CODEC_CAP_DR1
,
665 #if CONFIG_ZLIB_DECODER
666 AVCodec ff_zlib_decoder
= {
668 .long_name
= NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
669 .type
= AVMEDIA_TYPE_VIDEO
,
670 .id
= AV_CODEC_ID_ZLIB
,
671 .priv_data_size
= sizeof(LclDecContext
),
674 .decode
= decode_frame
,
675 .capabilities
= CODEC_CAP_DR1
,