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lcldec.c
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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  * @file
24  * LCL (LossLess Codec Library) Video Codec
25  * Decoder for MSZH and ZLIB codecs
26  * Experimental encoder for ZLIB RGB24
27  *
28  * Fourcc: MSZH, ZLIB
29  *
30  * Original Win32 dll:
31  * Ver2.23 By Kenji Oshima 2000.09.20
32  * avimszh.dll, avizlib.dll
33  *
34  * A description of the decoding algorithm can be found here:
35  * http://www.pcisys.net/~melanson/codecs
36  *
37  * Supports: BGR24 (RGB 24bpp)
38  *
39  */
40 
41 #include <stdio.h>
42 #include <stdlib.h>
43 
44 #include "libavutil/mem.h"
45 #include "libavutil/pixdesc.h"
46 #include "avcodec.h"
47 #include "bytestream.h"
48 #include "internal.h"
49 #include "lcl.h"
50 
51 #if CONFIG_ZLIB_DECODER
52 #include <zlib.h>
53 #endif
54 
55 /*
56  * Decoder context
57  */
58 typedef struct LclDecContext {
59  // Image type
60  int imgtype;
61  // Compression type
62  int compression;
63  // Flags
64  int flags;
65  // Decompressed data size
66  unsigned int decomp_size;
67  // Decompression buffer
68  unsigned char* decomp_buf;
69 #if CONFIG_ZLIB_DECODER
70  z_stream zstream;
71 #endif
72 } LclDecContext;
73 
74 
75 /**
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
78  */
79 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
80 {
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;
86 
87  while (srcptr < srcptr_end && destptr < destptr_end) {
88  if (!(mask & maskbit)) {
89  memcpy(destptr, srcptr, 4);
90  destptr += 4;
91  srcptr += 4;
92  } else {
93  unsigned ofs = bytestream_get_le16(&srcptr);
94  unsigned cnt = (ofs >> 11) + 1;
95  ofs &= 0x7ff;
96  ofs = FFMIN(ofs, destptr - destptr_bak);
97  cnt *= 4;
98  cnt = FFMIN(cnt, destptr_end - destptr);
99  if (ofs) {
100  av_memcpy_backptr(destptr, ofs, cnt);
101  } else {
102  // Not known what the correct behaviour is, but
103  // this at least avoids uninitialized data.
104  memset(destptr, 0, cnt);
105  }
106  destptr += cnt;
107  }
108  maskbit >>= 1;
109  if (!maskbit) {
110  mask = *srcptr++;
111  while (!mask) {
112  if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
113  memcpy(destptr, srcptr, 32);
114  destptr += 32;
115  srcptr += 32;
116  mask = *srcptr++;
117  }
118  maskbit = 0x80;
119  }
120  }
121 
122  return destptr - destptr_bak;
123 }
124 
125 
126 #if CONFIG_ZLIB_DECODER
127 /**
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
133  */
134 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
135 {
136  LclDecContext *c = avctx->priv_data;
137  int zret = inflateReset(&c->zstream);
138  if (zret != Z_OK) {
139  av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
140  return AVERROR_UNKNOWN;
141  }
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;
150  }
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;
155  }
156  return c->zstream.total_out;
157 }
158 #endif
159 
160 
161 /*
162  *
163  * Decode a frame
164  *
165  */
166 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
167 {
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;
173  int row, col;
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;
180  int uqvq, ret;
181  unsigned int mthread_inlen, mthread_outlen;
182  unsigned int len = buf_size;
183  int linesize;
184 
185  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
186  return ret;
187 
188  outptr = frame->data[0]; // Output image pointer
189 
190  /* Decompress frame */
191  switch (avctx->codec_id) {
192  case AV_CODEC_ID_MSZH:
193  switch (c->compression) {
194  case COMP_MSZH:
195  if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
196  c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
197  ;
198  } else if (c->flags & FLAG_MULTITHREAD) {
199  mthread_inlen = AV_RL32(buf);
200  if (len < 8) {
201  av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
202  return AVERROR_INVALIDDATA;
203  }
204  mthread_inlen = FFMIN(mthread_inlen, len - 8);
205  mthread_outlen = AV_RL32(buf + 4);
206  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
207  mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
208  if (mthread_outlen != mszh_dlen) {
209  av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
210  mthread_outlen, mszh_dlen);
211  return AVERROR_INVALIDDATA;
212  }
213  mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
214  c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
215  if (mthread_outlen != mszh_dlen) {
216  av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
217  mthread_outlen, mszh_dlen);
218  return AVERROR_INVALIDDATA;
219  }
220  encoded = c->decomp_buf;
221  len = c->decomp_size;
222  } else {
223  mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
224  if (c->decomp_size != mszh_dlen) {
225  av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
226  c->decomp_size, mszh_dlen);
227  return AVERROR_INVALIDDATA;
228  }
229  encoded = c->decomp_buf;
230  len = mszh_dlen;
231  }
232  break;
233  case COMP_MSZH_NOCOMP: {
234  int bppx2;
235  switch (c->imgtype) {
236  case IMGTYPE_YUV111:
237  case IMGTYPE_RGB24:
238  bppx2 = 6;
239  break;
240  case IMGTYPE_YUV422:
241  case IMGTYPE_YUV211:
242  bppx2 = 4;
243  break;
244  case IMGTYPE_YUV411:
245  case IMGTYPE_YUV420:
246  bppx2 = 3;
247  break;
248  default:
249  bppx2 = 0; // will error out below
250  break;
251  }
252  if (len < ((width * height * bppx2) >> 1))
253  return AVERROR_INVALIDDATA;
254  break;
255  }
256  default:
257  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
258  return AVERROR_INVALIDDATA;
259  }
260  break;
261 #if CONFIG_ZLIB_DECODER
262  case AV_CODEC_ID_ZLIB:
263  /* Using the original dll with normal compression (-1) and RGB format
264  * gives a file with ZLIB fourcc, but frame is really uncompressed.
265  * To be sure that's true check also frame size */
266  if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
267  len == width * height * 3) {
268  if (c->flags & FLAG_PNGFILTER) {
269  memcpy(c->decomp_buf, buf, len);
270  encoded = c->decomp_buf;
271  } else {
272  break;
273  }
274  } else if (c->flags & FLAG_MULTITHREAD) {
275  mthread_inlen = AV_RL32(buf);
276  mthread_inlen = FFMIN(mthread_inlen, len - 8);
277  mthread_outlen = AV_RL32(buf + 4);
278  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
279  ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
280  if (ret < 0) return ret;
281  ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
282  mthread_outlen, mthread_outlen);
283  if (ret < 0) return ret;
284  } else {
285  int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
286  if (ret < 0) return ret;
287  }
288  encoded = c->decomp_buf;
289  len = c->decomp_size;
290  break;
291 #endif
292  default:
293  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
294  return AVERROR_INVALIDDATA;
295  }
296 
297 
298  /* Apply PNG filter */
299  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
300  switch (c->imgtype) {
301  case IMGTYPE_YUV111:
302  case IMGTYPE_RGB24:
303  for (row = 0; row < height; row++) {
304  pixel_ptr = row * width * 3;
305  yq = encoded[pixel_ptr++];
306  uqvq = AV_RL16(encoded+pixel_ptr);
307  pixel_ptr += 2;
308  for (col = 1; col < width; col++) {
309  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
310  uqvq -= AV_RL16(encoded+pixel_ptr+1);
311  AV_WL16(encoded+pixel_ptr+1, uqvq);
312  pixel_ptr += 3;
313  }
314  }
315  break;
316  case IMGTYPE_YUV422:
317  for (row = 0; row < height; row++) {
318  pixel_ptr = row * width * 2;
319  yq = uq = vq =0;
320  for (col = 0; col < width/4; col++) {
321  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
322  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
323  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
324  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
325  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
326  encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
327  encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
328  encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
329  pixel_ptr += 8;
330  }
331  }
332  break;
333  case IMGTYPE_YUV411:
334  for (row = 0; row < height; row++) {
335  pixel_ptr = row * width / 2 * 3;
336  yq = uq = vq =0;
337  for (col = 0; col < width/4; col++) {
338  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
339  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
340  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
341  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
342  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
343  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
344  pixel_ptr += 6;
345  }
346  }
347  break;
348  case IMGTYPE_YUV211:
349  for (row = 0; row < height; row++) {
350  pixel_ptr = row * width * 2;
351  yq = uq = vq =0;
352  for (col = 0; col < width/2; col++) {
353  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
354  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
355  encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
356  encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
357  pixel_ptr += 4;
358  }
359  }
360  break;
361  case IMGTYPE_YUV420:
362  for (row = 0; row < height/2; row++) {
363  pixel_ptr = row * width * 3;
364  yq = y1q = uq = vq =0;
365  for (col = 0; col < width/2; col++) {
366  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
367  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
368  encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
369  encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
370  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
371  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
372  pixel_ptr += 6;
373  }
374  }
375  break;
376  default:
377  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
378  return AVERROR_INVALIDDATA;
379  }
380  }
381 
382  /* Convert colorspace */
383  y_out = frame->data[0] + (height - 1) * frame->linesize[0];
384  u_out = frame->data[1] + (height - 1) * frame->linesize[1];
385  v_out = frame->data[2] + (height - 1) * frame->linesize[2];
386  switch (c->imgtype) {
387  case IMGTYPE_YUV111:
388  for (row = 0; row < height; row++) {
389  for (col = 0; col < width; col++) {
390  y_out[col] = *encoded++;
391  u_out[col] = *encoded++ + 128;
392  v_out[col] = *encoded++ + 128;
393  }
394  y_out -= frame->linesize[0];
395  u_out -= frame->linesize[1];
396  v_out -= frame->linesize[2];
397  }
398  break;
399  case IMGTYPE_YUV422:
400  for (row = 0; row < height; row++) {
401  for (col = 0; col < width - 3; col += 4) {
402  memcpy(y_out + col, encoded, 4);
403  encoded += 4;
404  u_out[ col >> 1 ] = *encoded++ + 128;
405  u_out[(col >> 1) + 1] = *encoded++ + 128;
406  v_out[ col >> 1 ] = *encoded++ + 128;
407  v_out[(col >> 1) + 1] = *encoded++ + 128;
408  }
409  y_out -= frame->linesize[0];
410  u_out -= frame->linesize[1];
411  v_out -= frame->linesize[2];
412  }
413  break;
414  case IMGTYPE_RGB24:
415  linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
416  for (row = height - 1; row >= 0; row--) {
417  pixel_ptr = row * frame->linesize[0];
418  memcpy(outptr + pixel_ptr, encoded, 3 * width);
419  encoded += linesize;
420  }
421  break;
422  case IMGTYPE_YUV411:
423  for (row = 0; row < height; row++) {
424  for (col = 0; col < width - 3; col += 4) {
425  memcpy(y_out + col, encoded, 4);
426  encoded += 4;
427  u_out[col >> 2] = *encoded++ + 128;
428  v_out[col >> 2] = *encoded++ + 128;
429  }
430  y_out -= frame->linesize[0];
431  u_out -= frame->linesize[1];
432  v_out -= frame->linesize[2];
433  }
434  break;
435  case IMGTYPE_YUV211:
436  for (row = 0; row < height; row++) {
437  for (col = 0; col < width - 1; col += 2) {
438  memcpy(y_out + col, encoded, 2);
439  encoded += 2;
440  u_out[col >> 1] = *encoded++ + 128;
441  v_out[col >> 1] = *encoded++ + 128;
442  }
443  y_out -= frame->linesize[0];
444  u_out -= frame->linesize[1];
445  v_out -= frame->linesize[2];
446  }
447  break;
448  case IMGTYPE_YUV420:
449  u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
450  v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
451  for (row = 0; row < height - 1; row += 2) {
452  for (col = 0; col < width - 1; col += 2) {
453  memcpy(y_out + col, encoded, 2);
454  encoded += 2;
455  memcpy(y_out + col - frame->linesize[0], encoded, 2);
456  encoded += 2;
457  u_out[col >> 1] = *encoded++ + 128;
458  v_out[col >> 1] = *encoded++ + 128;
459  }
460  y_out -= frame->linesize[0] << 1;
461  u_out -= frame->linesize[1];
462  v_out -= frame->linesize[2];
463  }
464  break;
465  default:
466  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
467  return AVERROR_INVALIDDATA;
468  }
469 
470  *got_frame = 1;
471 
472  /* always report that the buffer was completely consumed */
473  return buf_size;
474 }
475 
476 /*
477  *
478  * Init lcl decoder
479  *
480  */
481 static av_cold int decode_init(AVCodecContext *avctx)
482 {
483  LclDecContext * const c = avctx->priv_data;
484  unsigned int basesize = avctx->width * avctx->height;
485  unsigned int max_basesize = FFALIGN(avctx->width, 4) *
486  FFALIGN(avctx->height, 4);
487  unsigned int max_decomp_size;
488  int subsample_h, subsample_v;
489 
490  if (avctx->extradata_size < 8) {
491  av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
492  return AVERROR_INVALIDDATA;
493  }
494 
495  /* Check codec type */
496  if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
497  (avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
498  av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
499  }
500 
501  /* Detect image type */
502  switch (c->imgtype = avctx->extradata[4]) {
503  case IMGTYPE_YUV111:
504  c->decomp_size = basesize * 3;
505  max_decomp_size = max_basesize * 3;
506  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
507  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
508  break;
509  case IMGTYPE_YUV422:
510  c->decomp_size = basesize * 2;
511  max_decomp_size = max_basesize * 2;
512  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
513  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
514  if (avctx->width % 4) {
515  avpriv_request_sample(avctx, "Unsupported dimensions\n");
516  return AVERROR_INVALIDDATA;
517  }
518  break;
519  case IMGTYPE_RGB24:
520  c->decomp_size = basesize * 3;
521  max_decomp_size = max_basesize * 3;
522  avctx->pix_fmt = AV_PIX_FMT_BGR24;
523  av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
524  break;
525  case IMGTYPE_YUV411:
526  c->decomp_size = basesize / 2 * 3;
527  max_decomp_size = max_basesize / 2 * 3;
528  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
529  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
530  break;
531  case IMGTYPE_YUV211:
532  c->decomp_size = basesize * 2;
533  max_decomp_size = max_basesize * 2;
534  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
535  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
536  break;
537  case IMGTYPE_YUV420:
538  c->decomp_size = basesize / 2 * 3;
539  max_decomp_size = max_basesize / 2 * 3;
540  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
541  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
542  break;
543  default:
544  av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
545  return AVERROR_INVALIDDATA;
546  }
547 
548  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
549  if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
550  avpriv_request_sample(avctx, "Unsupported dimensions\n");
551  return AVERROR_INVALIDDATA;
552  }
553 
554  /* Detect compression method */
555  c->compression = (int8_t)avctx->extradata[5];
556  switch (avctx->codec_id) {
557  case AV_CODEC_ID_MSZH:
558  switch (c->compression) {
559  case COMP_MSZH:
560  av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
561  break;
562  case COMP_MSZH_NOCOMP:
563  c->decomp_size = 0;
564  av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
565  break;
566  default:
567  av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
568  return AVERROR_INVALIDDATA;
569  }
570  break;
571 #if CONFIG_ZLIB_DECODER
572  case AV_CODEC_ID_ZLIB:
573  switch (c->compression) {
574  case COMP_ZLIB_HISPEED:
575  av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
576  break;
577  case COMP_ZLIB_HICOMP:
578  av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
579  break;
580  case COMP_ZLIB_NORMAL:
581  av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
582  break;
583  default:
584  if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
585  av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
586  return AVERROR_INVALIDDATA;
587  }
588  av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
589  }
590  break;
591 #endif
592  default:
593  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
594  return AVERROR_INVALIDDATA;
595  }
596 
597  /* Allocate decompression buffer */
598  if (c->decomp_size) {
599  if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
600  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
601  return AVERROR(ENOMEM);
602  }
603  }
604 
605  /* Detect flags */
606  c->flags = avctx->extradata[6];
607  if (c->flags & FLAG_MULTITHREAD)
608  av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
609  if (c->flags & FLAG_NULLFRAME)
610  av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
611  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
612  av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
613  if (c->flags & FLAGMASK_UNUSED)
614  av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
615 
616  /* If needed init zlib */
617 #if CONFIG_ZLIB_DECODER
618  if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
619  int zret;
620  c->zstream.zalloc = Z_NULL;
621  c->zstream.zfree = Z_NULL;
622  c->zstream.opaque = Z_NULL;
623  zret = inflateInit(&c->zstream);
624  if (zret != Z_OK) {
625  av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
626  av_freep(&c->decomp_buf);
627  return AVERROR_UNKNOWN;
628  }
629  }
630 #endif
631 
632  return 0;
633 }
634 
635 /*
636  *
637  * Uninit lcl decoder
638  *
639  */
640 static av_cold int decode_end(AVCodecContext *avctx)
641 {
642  LclDecContext * const c = avctx->priv_data;
643 
644  av_freep(&c->decomp_buf);
645 #if CONFIG_ZLIB_DECODER
646  if (avctx->codec_id == AV_CODEC_ID_ZLIB)
647  inflateEnd(&c->zstream);
648 #endif
649 
650  return 0;
651 }
652 
653 #if CONFIG_MSZH_DECODER
654 AVCodec ff_mszh_decoder = {
655  .name = "mszh",
656  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
657  .type = AVMEDIA_TYPE_VIDEO,
658  .id = AV_CODEC_ID_MSZH,
659  .priv_data_size = sizeof(LclDecContext),
660  .init = decode_init,
661  .close = decode_end,
662  .decode = decode_frame,
663  .capabilities = CODEC_CAP_DR1,
664 };
665 #endif
666 
667 #if CONFIG_ZLIB_DECODER
668 AVCodec ff_zlib_decoder = {
669  .name = "zlib",
670  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
671  .type = AVMEDIA_TYPE_VIDEO,
672  .id = AV_CODEC_ID_ZLIB,
673  .priv_data_size = sizeof(LclDecContext),
674  .init = decode_init,
675  .close = decode_end,
676  .decode = decode_frame,
677  .capabilities = CODEC_CAP_DR1,
678 };
679 #endif
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