FFmpeg  4.3
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 #include <stdio.h>
41 #include <stdlib.h>
42 
43 #include "libavutil/mem.h"
44 #include "libavutil/pixdesc.h"
45 #include "avcodec.h"
46 #include "bytestream.h"
47 #include "internal.h"
48 #include "lcl.h"
49 #include "thread.h"
50 
51 #if CONFIG_ZLIB_DECODER
52 #include <zlib.h>
53 #endif
54 
55 typedef struct LclDecContext {
56  // Image type
57  int imgtype;
58  // Compression type
60  // Flags
61  int flags;
62  // Decompressed data size
63  unsigned int decomp_size;
64  // Decompression buffer
65  unsigned char* decomp_buf;
66 #if CONFIG_ZLIB_DECODER
67  z_stream zstream;
68 #endif
70 
71 
72 /**
73  * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
74  * @param destptr must be padded sufficiently for av_memcpy_backptr
75  */
76 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
77 {
78  unsigned char *destptr_bak = destptr;
79  unsigned char *destptr_end = destptr + destsize;
80  const unsigned char *srcptr_end = srcptr + srclen;
81  unsigned mask = *srcptr++;
82  unsigned maskbit = 0x80;
83 
84  while (srcptr < srcptr_end && destptr < destptr_end) {
85  if (!(mask & maskbit)) {
86  memcpy(destptr, srcptr, 4);
87  destptr += 4;
88  srcptr += 4;
89  } else {
90  unsigned ofs = bytestream_get_le16(&srcptr);
91  unsigned cnt = (ofs >> 11) + 1;
92  ofs &= 0x7ff;
93  ofs = FFMIN(ofs, destptr - destptr_bak);
94  cnt *= 4;
95  cnt = FFMIN(cnt, destptr_end - destptr);
96  if (ofs) {
97  av_memcpy_backptr(destptr, ofs, cnt);
98  } else {
99  // Not known what the correct behaviour is, but
100  // this at least avoids uninitialized data.
101  memset(destptr, 0, cnt);
102  }
103  destptr += cnt;
104  }
105  maskbit >>= 1;
106  if (!maskbit) {
107  mask = *srcptr++;
108  while (!mask) {
109  if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
110  memcpy(destptr, srcptr, 32);
111  destptr += 32;
112  srcptr += 32;
113  mask = *srcptr++;
114  }
115  maskbit = 0x80;
116  }
117  }
118 
119  return destptr - destptr_bak;
120 }
121 
122 
123 #if CONFIG_ZLIB_DECODER
124 /**
125  * @brief decompress a zlib-compressed data block into decomp_buf
126  * @param src compressed input buffer
127  * @param src_len data length in input buffer
128  * @param offset offset in decomp_buf
129  * @param expected expected decompressed length
130  */
131 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
132 {
133  LclDecContext *c = avctx->priv_data;
134  int zret = inflateReset(&c->zstream);
135  if (zret != Z_OK) {
136  av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
137  return AVERROR_UNKNOWN;
138  }
139  c->zstream.next_in = src;
140  c->zstream.avail_in = src_len;
141  c->zstream.next_out = c->decomp_buf + offset;
142  c->zstream.avail_out = c->decomp_size - offset;
143  zret = inflate(&c->zstream, Z_FINISH);
144  if (zret != Z_OK && zret != Z_STREAM_END) {
145  av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
146  return AVERROR_UNKNOWN;
147  }
148  if (expected != (unsigned int)c->zstream.total_out) {
149  av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
150  expected, c->zstream.total_out);
151  return AVERROR_UNKNOWN;
152  }
153  return c->zstream.total_out;
154 }
155 #endif
156 
157 
158 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
159 {
160  AVFrame *frame = data;
161  ThreadFrame tframe = { .f = data };
162  const uint8_t *buf = avpkt->data;
163  int buf_size = avpkt->size;
164  LclDecContext * const c = avctx->priv_data;
165  unsigned int pixel_ptr;
166  int row, col;
167  unsigned char *encoded = avpkt->data, *outptr;
168  uint8_t *y_out, *u_out, *v_out;
169  unsigned int width = avctx->width; // Real image width
170  unsigned int height = avctx->height; // Real image height
171  unsigned int mszh_dlen;
172  unsigned char yq, y1q, uq, vq;
173  int uqvq, ret;
174  unsigned int mthread_inlen, mthread_outlen;
175  unsigned int len = buf_size;
176  int linesize;
177 
178  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
179  return ret;
180 
181  outptr = frame->data[0]; // Output image pointer
182 
183  /* Decompress frame */
184  switch (avctx->codec_id) {
185  case AV_CODEC_ID_MSZH:
186  switch (c->compression) {
187  case COMP_MSZH:
188  if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
189  c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
190  ;
191  } else if (c->flags & FLAG_MULTITHREAD) {
192  mthread_inlen = AV_RL32(buf);
193  if (len < 8 || len - 8 < mthread_inlen) {
194  av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
195  return AVERROR_INVALIDDATA;
196  }
197  mthread_outlen = AV_RL32(buf + 4);
198  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
199  mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
200  if (mthread_outlen != mszh_dlen) {
201  av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
202  mthread_outlen, mszh_dlen);
203  return AVERROR_INVALIDDATA;
204  }
205  mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
206  c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
207  if (mthread_outlen != mszh_dlen) {
208  av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
209  mthread_outlen, mszh_dlen);
210  return AVERROR_INVALIDDATA;
211  }
212  encoded = c->decomp_buf;
213  len = c->decomp_size;
214  } else {
215  mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
216  if (c->decomp_size != mszh_dlen) {
217  av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
218  c->decomp_size, mszh_dlen);
219  return AVERROR_INVALIDDATA;
220  }
221  encoded = c->decomp_buf;
222  len = mszh_dlen;
223  }
224  break;
225  case COMP_MSZH_NOCOMP: {
226  int bppx2;
227  switch (c->imgtype) {
228  case IMGTYPE_YUV111:
229  case IMGTYPE_RGB24:
230  bppx2 = 6;
231  break;
232  case IMGTYPE_YUV422:
233  case IMGTYPE_YUV211:
234  bppx2 = 4;
235  break;
236  case IMGTYPE_YUV411:
237  case IMGTYPE_YUV420:
238  bppx2 = 3;
239  break;
240  default:
241  bppx2 = 0; // will error out below
242  break;
243  }
244  if (len < ((width * height * bppx2) >> 1))
245  return AVERROR_INVALIDDATA;
246  break;
247  }
248  default:
249  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
250  return AVERROR_INVALIDDATA;
251  }
252  break;
253 #if CONFIG_ZLIB_DECODER
254  case AV_CODEC_ID_ZLIB:
255  /* Using the original dll with normal compression (-1) and RGB format
256  * gives a file with ZLIB fourcc, but frame is really uncompressed.
257  * To be sure that's true check also frame size */
258  if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
259  len == width * height * 3) {
260  if (c->flags & FLAG_PNGFILTER) {
261  memcpy(c->decomp_buf, buf, len);
262  encoded = c->decomp_buf;
263  } else {
264  break;
265  }
266  } else if (c->flags & FLAG_MULTITHREAD) {
267  mthread_inlen = AV_RL32(buf);
268  mthread_inlen = FFMIN(mthread_inlen, len - 8);
269  mthread_outlen = AV_RL32(buf + 4);
270  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
271  ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
272  if (ret < 0) return ret;
273  ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
274  mthread_outlen, mthread_outlen);
275  if (ret < 0) return ret;
276  } else {
277  int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
278  if (ret < 0) return ret;
279  }
280  encoded = c->decomp_buf;
281  len = c->decomp_size;
282  break;
283 #endif
284  default:
285  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
286  return AVERROR_INVALIDDATA;
287  }
288 
289 
290  /* Apply PNG filter */
291  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
292  switch (c->imgtype) {
293  case IMGTYPE_YUV111:
294  case IMGTYPE_RGB24:
295  for (row = 0; row < height; row++) {
296  pixel_ptr = row * width * 3;
297  yq = encoded[pixel_ptr++];
298  uqvq = AV_RL16(encoded+pixel_ptr);
299  pixel_ptr += 2;
300  for (col = 1; col < width; col++) {
301  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
302  uqvq -= AV_RL16(encoded+pixel_ptr+1);
303  AV_WL16(encoded+pixel_ptr+1, uqvq);
304  pixel_ptr += 3;
305  }
306  }
307  break;
308  case IMGTYPE_YUV422:
309  for (row = 0; row < height; row++) {
310  pixel_ptr = row * width * 2;
311  yq = uq = vq =0;
312  for (col = 0; col < width/4; col++) {
313  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
314  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
315  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
316  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
317  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
318  encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
319  encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
320  encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
321  pixel_ptr += 8;
322  }
323  }
324  break;
325  case IMGTYPE_YUV411:
326  for (row = 0; row < height; row++) {
327  pixel_ptr = row * width / 2 * 3;
328  yq = uq = vq =0;
329  for (col = 0; col < width/4; col++) {
330  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
331  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
332  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
333  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
334  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
335  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
336  pixel_ptr += 6;
337  }
338  }
339  break;
340  case IMGTYPE_YUV211:
341  for (row = 0; row < height; row++) {
342  pixel_ptr = row * width * 2;
343  yq = uq = vq =0;
344  for (col = 0; col < width/2; col++) {
345  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
346  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
347  encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
348  encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
349  pixel_ptr += 4;
350  }
351  }
352  break;
353  case IMGTYPE_YUV420:
354  for (row = 0; row < height/2; row++) {
355  pixel_ptr = row * width * 3;
356  yq = y1q = uq = vq =0;
357  for (col = 0; col < width/2; col++) {
358  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
359  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
360  encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
361  encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
362  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
363  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
364  pixel_ptr += 6;
365  }
366  }
367  break;
368  default:
369  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
370  return AVERROR_INVALIDDATA;
371  }
372  }
373 
374  /* Convert colorspace */
375  y_out = frame->data[0] + (height - 1) * frame->linesize[0];
376  u_out = frame->data[1] + (height - 1) * frame->linesize[1];
377  v_out = frame->data[2] + (height - 1) * frame->linesize[2];
378  switch (c->imgtype) {
379  case IMGTYPE_YUV111:
380  for (row = 0; row < height; row++) {
381  for (col = 0; col < width; col++) {
382  y_out[col] = *encoded++;
383  u_out[col] = *encoded++ + 128;
384  v_out[col] = *encoded++ + 128;
385  }
386  y_out -= frame->linesize[0];
387  u_out -= frame->linesize[1];
388  v_out -= frame->linesize[2];
389  }
390  break;
391  case IMGTYPE_YUV422:
392  for (row = 0; row < height; row++) {
393  for (col = 0; col < width - 3; col += 4) {
394  memcpy(y_out + col, encoded, 4);
395  encoded += 4;
396  u_out[ col >> 1 ] = *encoded++ + 128;
397  u_out[(col >> 1) + 1] = *encoded++ + 128;
398  v_out[ col >> 1 ] = *encoded++ + 128;
399  v_out[(col >> 1) + 1] = *encoded++ + 128;
400  }
401  y_out -= frame->linesize[0];
402  u_out -= frame->linesize[1];
403  v_out -= frame->linesize[2];
404  }
405  break;
406  case IMGTYPE_RGB24:
407  linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
408  for (row = height - 1; row >= 0; row--) {
409  pixel_ptr = row * frame->linesize[0];
410  memcpy(outptr + pixel_ptr, encoded, 3 * width);
411  encoded += linesize;
412  }
413  break;
414  case IMGTYPE_YUV411:
415  for (row = 0; row < height; row++) {
416  for (col = 0; col < width - 3; col += 4) {
417  memcpy(y_out + col, encoded, 4);
418  encoded += 4;
419  u_out[col >> 2] = *encoded++ + 128;
420  v_out[col >> 2] = *encoded++ + 128;
421  }
422  y_out -= frame->linesize[0];
423  u_out -= frame->linesize[1];
424  v_out -= frame->linesize[2];
425  }
426  break;
427  case IMGTYPE_YUV211:
428  for (row = 0; row < height; row++) {
429  for (col = 0; col < width - 1; col += 2) {
430  memcpy(y_out + col, encoded, 2);
431  encoded += 2;
432  u_out[col >> 1] = *encoded++ + 128;
433  v_out[col >> 1] = *encoded++ + 128;
434  }
435  y_out -= frame->linesize[0];
436  u_out -= frame->linesize[1];
437  v_out -= frame->linesize[2];
438  }
439  break;
440  case IMGTYPE_YUV420:
441  u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
442  v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
443  for (row = 0; row < height - 1; row += 2) {
444  for (col = 0; col < width - 1; col += 2) {
445  memcpy(y_out + col, encoded, 2);
446  encoded += 2;
447  memcpy(y_out + col - frame->linesize[0], encoded, 2);
448  encoded += 2;
449  u_out[col >> 1] = *encoded++ + 128;
450  v_out[col >> 1] = *encoded++ + 128;
451  }
452  y_out -= frame->linesize[0] << 1;
453  u_out -= frame->linesize[1];
454  v_out -= frame->linesize[2];
455  }
456  break;
457  default:
458  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
459  return AVERROR_INVALIDDATA;
460  }
461 
462  frame->key_frame = 1;
463  frame->pict_type = AV_PICTURE_TYPE_I;
464 
465  *got_frame = 1;
466 
467  /* always report that the buffer was completely consumed */
468  return buf_size;
469 }
470 
472 {
473  LclDecContext * const c = avctx->priv_data;
474  unsigned int basesize = avctx->width * avctx->height;
475  unsigned int max_basesize = FFALIGN(avctx->width, 4) *
476  FFALIGN(avctx->height, 4);
477  unsigned int max_decomp_size;
478  int subsample_h, subsample_v;
479 
480  if (avctx->extradata_size < 8) {
481  av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
482  return AVERROR_INVALIDDATA;
483  }
484 
485  /* Check codec type */
486  if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
487  (avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
488  av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
489  }
490 
491  /* Detect image type */
492  switch (c->imgtype = avctx->extradata[4]) {
493  case IMGTYPE_YUV111:
494  c->decomp_size = basesize * 3;
495  max_decomp_size = max_basesize * 3;
496  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
497  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
498  break;
499  case IMGTYPE_YUV422:
500  c->decomp_size = basesize * 2;
501  max_decomp_size = max_basesize * 2;
502  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
503  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
504  if (avctx->width % 4) {
505  avpriv_request_sample(avctx, "Unsupported dimensions");
506  return AVERROR_INVALIDDATA;
507  }
508  break;
509  case IMGTYPE_RGB24:
510  c->decomp_size = basesize * 3;
511  max_decomp_size = max_basesize * 3;
512  avctx->pix_fmt = AV_PIX_FMT_BGR24;
513  av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
514  break;
515  case IMGTYPE_YUV411:
516  c->decomp_size = basesize / 2 * 3;
517  max_decomp_size = max_basesize / 2 * 3;
518  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
519  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
520  break;
521  case IMGTYPE_YUV211:
522  c->decomp_size = basesize * 2;
523  max_decomp_size = max_basesize * 2;
524  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
525  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
526  break;
527  case IMGTYPE_YUV420:
528  c->decomp_size = basesize / 2 * 3;
529  max_decomp_size = max_basesize / 2 * 3;
530  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
531  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
532  break;
533  default:
534  av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
535  return AVERROR_INVALIDDATA;
536  }
537 
538  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
539  if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
540  avpriv_request_sample(avctx, "Unsupported dimensions");
541  return AVERROR_INVALIDDATA;
542  }
543 
544  /* Detect compression method */
545  c->compression = (int8_t)avctx->extradata[5];
546  switch (avctx->codec_id) {
547  case AV_CODEC_ID_MSZH:
548  switch (c->compression) {
549  case COMP_MSZH:
550  av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
551  break;
552  case COMP_MSZH_NOCOMP:
553  c->decomp_size = 0;
554  av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
555  break;
556  default:
557  av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
558  return AVERROR_INVALIDDATA;
559  }
560  break;
561 #if CONFIG_ZLIB_DECODER
562  case AV_CODEC_ID_ZLIB:
563  switch (c->compression) {
564  case COMP_ZLIB_HISPEED:
565  av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
566  break;
567  case COMP_ZLIB_HICOMP:
568  av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
569  break;
570  case COMP_ZLIB_NORMAL:
571  av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
572  break;
573  default:
574  if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
575  av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
576  return AVERROR_INVALIDDATA;
577  }
578  av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
579  }
580  break;
581 #endif
582  default:
583  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
584  return AVERROR_INVALIDDATA;
585  }
586 
587  /* Allocate decompression buffer */
588  if (c->decomp_size) {
589  if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
590  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
591  return AVERROR(ENOMEM);
592  }
593  }
594 
595  /* Detect flags */
596  c->flags = avctx->extradata[6];
597  if (c->flags & FLAG_MULTITHREAD)
598  av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
599  if (c->flags & FLAG_NULLFRAME)
600  av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
601  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
602  av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
603  if (c->flags & FLAGMASK_UNUSED)
604  av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
605 
606  /* If needed init zlib */
607 #if CONFIG_ZLIB_DECODER
608  if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
609  int zret;
610  c->zstream.zalloc = Z_NULL;
611  c->zstream.zfree = Z_NULL;
612  c->zstream.opaque = Z_NULL;
613  zret = inflateInit(&c->zstream);
614  if (zret != Z_OK) {
615  av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
616  av_freep(&c->decomp_buf);
617  return AVERROR_UNKNOWN;
618  }
619  }
620 #endif
621 
622  return 0;
623 }
624 
626 {
627  LclDecContext * const c = avctx->priv_data;
628 
629  av_freep(&c->decomp_buf);
630 #if CONFIG_ZLIB_DECODER
631  if (avctx->codec_id == AV_CODEC_ID_ZLIB)
632  inflateEnd(&c->zstream);
633 #endif
634 
635  return 0;
636 }
637 
638 #if CONFIG_MSZH_DECODER
640  .name = "mszh",
641  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
642  .type = AVMEDIA_TYPE_VIDEO,
643  .id = AV_CODEC_ID_MSZH,
644  .priv_data_size = sizeof(LclDecContext),
645  .init = decode_init,
646  .close = decode_end,
647  .decode = decode_frame,
649  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
650 };
651 #endif
652 
653 #if CONFIG_ZLIB_DECODER
655  .name = "zlib",
656  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
657  .type = AVMEDIA_TYPE_VIDEO,
658  .id = AV_CODEC_ID_ZLIB,
659  .priv_data_size = sizeof(LclDecContext),
660  .init = decode_init,
661  .close = decode_end,
662  .decode = decode_frame,
664  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
665 };
666 #endif
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
#define COMP_MSZH
Definition: lcl.h:35
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
AVFrame * f
Definition: thread.h:35
Memory handling functions.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
int size
Definition: packet.h:356
#define COMP_ZLIB_HISPEED
Definition: lcl.h:37
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
#define AV_RL16
Definition: intreadwrite.h:42
unsigned int decomp_size
Definition: lcldec.c:63
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
uint8_t
#define FLAG_PNGFILTER
Definition: lcl.h:43
#define av_cold
Definition: attributes.h:88
#define av_malloc(s)
Multithreading support functions.
#define IMGTYPE_YUV211
Definition: lcl.h:32
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
#define COMP_ZLIB_NORMAL
Definition: lcl.h:39
static AVFrame * frame
const char data[16]
Definition: mxf.c:91
int imgtype
Definition: lcldec.c:57
#define height
uint8_t * data
Definition: packet.h:355
#define IMGTYPE_YUV420
Definition: lcl.h:33
void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
Overlapping memcpy() implementation.
Definition: mem.c:430
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
#define IMGTYPE_YUV422
Definition: lcl.h:29
#define src
Definition: vp8dsp.c:254
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: lcldec.c:158
static const uint16_t mask[17]
Definition: lzw.c:38
#define CODEC_ZLIB
Definition: lcl.h:47
#define AVERROR(e)
Definition: error.h:43
int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
Definition: pixdesc.c:2577
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
#define IMGTYPE_RGB24
Definition: lcl.h:30
const char * name
Name of the codec implementation.
Definition: codec.h:197
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
#define FLAGMASK_UNUSED
Definition: lcl.h:44
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:106
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
#define IMGTYPE_YUV111
Definition: lcl.h:28
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
#define FFMIN(a, b)
Definition: common.h:96
#define width
int width
picture width / height.
Definition: avcodec.h:699
int compression
Definition: lcldec.c:59
#define AV_RL32
Definition: intreadwrite.h:146
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AVCodec ff_zlib_decoder
#define IMGTYPE_YUV411
Definition: lcl.h:31
#define CODEC_MSZH
Definition: lcl.h:46
int flags
Definition: lcldec.c:61
unsigned char * decomp_buf
Definition: lcldec.c:65
Libavcodec external API header.
enum AVCodecID codec_id
Definition: avcodec.h:536
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:526
#define COMP_ZLIB_HICOMP
Definition: lcl.h:38
int extradata_size
Definition: avcodec.h:628
#define FLAG_NULLFRAME
Definition: lcl.h:42
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
Definition: vf_neighbor.c:198
static av_cold int decode_end(AVCodecContext *avctx)
Definition: lcldec.c:625
static unsigned int mszh_decomp(const unsigned char *srcptr, int srclen, unsigned char *destptr, unsigned int destsize)
Definition: lcldec.c:76
static av_cold int decode_init(AVCodecContext *avctx)
Definition: lcldec.c:471
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal api header.
AVCodec ff_mszh_decoder
static double c[64]
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
void * priv_data
Definition: avcodec.h:553
int len
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
#define FLAG_MULTITHREAD
Definition: lcl.h:41
#define COMP_MSZH_NOCOMP
Definition: lcl.h:36
#define av_freep(p)
This structure stores compressed data.
Definition: packet.h:332
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50