FFmpeg  4.4.4
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, offset;
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  offset = (height - 1) * frame->linesize[1];
377  u_out = FF_PTR_ADD(frame->data[1], offset);
378  offset = (height - 1) * frame->linesize[2];
379  v_out = FF_PTR_ADD(frame->data[2], offset);
380  switch (c->imgtype) {
381  case IMGTYPE_YUV111:
382  for (row = 0; row < height; row++) {
383  for (col = 0; col < width; col++) {
384  y_out[col] = *encoded++;
385  u_out[col] = *encoded++ + 128;
386  v_out[col] = *encoded++ + 128;
387  }
388  y_out -= frame->linesize[0];
389  u_out -= frame->linesize[1];
390  v_out -= frame->linesize[2];
391  }
392  break;
393  case IMGTYPE_YUV422:
394  for (row = 0; row < height; row++) {
395  for (col = 0; col < width - 3; col += 4) {
396  memcpy(y_out + col, encoded, 4);
397  encoded += 4;
398  u_out[ col >> 1 ] = *encoded++ + 128;
399  u_out[(col >> 1) + 1] = *encoded++ + 128;
400  v_out[ col >> 1 ] = *encoded++ + 128;
401  v_out[(col >> 1) + 1] = *encoded++ + 128;
402  }
403  y_out -= frame->linesize[0];
404  u_out -= frame->linesize[1];
405  v_out -= frame->linesize[2];
406  }
407  break;
408  case IMGTYPE_RGB24:
409  linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
410  for (row = height - 1; row >= 0; row--) {
411  pixel_ptr = row * frame->linesize[0];
412  memcpy(outptr + pixel_ptr, encoded, 3 * width);
413  encoded += linesize;
414  }
415  break;
416  case IMGTYPE_YUV411:
417  for (row = 0; row < height; row++) {
418  for (col = 0; col < width - 3; col += 4) {
419  memcpy(y_out + col, encoded, 4);
420  encoded += 4;
421  u_out[col >> 2] = *encoded++ + 128;
422  v_out[col >> 2] = *encoded++ + 128;
423  }
424  y_out -= frame->linesize[0];
425  u_out -= frame->linesize[1];
426  v_out -= frame->linesize[2];
427  }
428  break;
429  case IMGTYPE_YUV211:
430  for (row = 0; row < height; row++) {
431  for (col = 0; col < width - 1; col += 2) {
432  memcpy(y_out + col, encoded, 2);
433  encoded += 2;
434  u_out[col >> 1] = *encoded++ + 128;
435  v_out[col >> 1] = *encoded++ + 128;
436  }
437  y_out -= frame->linesize[0];
438  u_out -= frame->linesize[1];
439  v_out -= frame->linesize[2];
440  }
441  break;
442  case IMGTYPE_YUV420:
443  u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
444  v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
445  for (row = 0; row < height - 1; row += 2) {
446  for (col = 0; col < width - 1; col += 2) {
447  memcpy(y_out + col, encoded, 2);
448  encoded += 2;
449  memcpy(y_out + col - frame->linesize[0], encoded, 2);
450  encoded += 2;
451  u_out[col >> 1] = *encoded++ + 128;
452  v_out[col >> 1] = *encoded++ + 128;
453  }
454  y_out -= frame->linesize[0] << 1;
455  u_out -= frame->linesize[1];
456  v_out -= frame->linesize[2];
457  }
458  break;
459  default:
460  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
461  return AVERROR_INVALIDDATA;
462  }
463 
464  frame->key_frame = 1;
466 
467  *got_frame = 1;
468 
469  /* always report that the buffer was completely consumed */
470  return buf_size;
471 }
472 
474 {
475  LclDecContext * const c = avctx->priv_data;
476  unsigned int basesize = avctx->width * avctx->height;
477  unsigned int max_basesize = FFALIGN(avctx->width, 4) *
478  FFALIGN(avctx->height, 4);
479  unsigned int max_decomp_size;
480  int subsample_h, subsample_v;
481 
482  if (avctx->extradata_size < 8) {
483  av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
484  return AVERROR_INVALIDDATA;
485  }
486 
487  /* Check codec type */
488  if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
489  (avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
490  av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
491  }
492 
493  /* Detect image type */
494  switch (c->imgtype = avctx->extradata[4]) {
495  case IMGTYPE_YUV111:
496  c->decomp_size = basesize * 3;
497  max_decomp_size = max_basesize * 3;
498  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
499  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
500  break;
501  case IMGTYPE_YUV422:
502  c->decomp_size = basesize * 2;
503  max_decomp_size = max_basesize * 2;
504  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
505  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
506  if (avctx->width % 4) {
507  avpriv_request_sample(avctx, "Unsupported dimensions");
508  return AVERROR_INVALIDDATA;
509  }
510  break;
511  case IMGTYPE_RGB24:
512  c->decomp_size = basesize * 3;
513  max_decomp_size = max_basesize * 3;
514  avctx->pix_fmt = AV_PIX_FMT_BGR24;
515  av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
516  break;
517  case IMGTYPE_YUV411:
518  c->decomp_size = basesize / 2 * 3;
519  max_decomp_size = max_basesize / 2 * 3;
520  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
521  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
522  break;
523  case IMGTYPE_YUV211:
524  c->decomp_size = basesize * 2;
525  max_decomp_size = max_basesize * 2;
526  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
527  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
528  break;
529  case IMGTYPE_YUV420:
530  c->decomp_size = basesize / 2 * 3;
531  max_decomp_size = max_basesize / 2 * 3;
532  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
533  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
534  break;
535  default:
536  av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
537  return AVERROR_INVALIDDATA;
538  }
539 
540  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
541  if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
542  avpriv_request_sample(avctx, "Unsupported dimensions");
543  return AVERROR_INVALIDDATA;
544  }
545 
546  /* Detect compression method */
547  c->compression = (int8_t)avctx->extradata[5];
548  switch (avctx->codec_id) {
549  case AV_CODEC_ID_MSZH:
550  switch (c->compression) {
551  case COMP_MSZH:
552  av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
553  break;
554  case COMP_MSZH_NOCOMP:
555  c->decomp_size = 0;
556  av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
557  break;
558  default:
559  av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
560  return AVERROR_INVALIDDATA;
561  }
562  break;
563 #if CONFIG_ZLIB_DECODER
564  case AV_CODEC_ID_ZLIB:
565  switch (c->compression) {
566  case COMP_ZLIB_HISPEED:
567  av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
568  break;
569  case COMP_ZLIB_HICOMP:
570  av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
571  break;
572  case COMP_ZLIB_NORMAL:
573  av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
574  break;
575  default:
576  if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
577  av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
578  return AVERROR_INVALIDDATA;
579  }
580  av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
581  }
582  break;
583 #endif
584  default:
585  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
586  return AVERROR_INVALIDDATA;
587  }
588 
589  /* Allocate decompression buffer */
590  if (c->decomp_size) {
591  if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
592  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
593  return AVERROR(ENOMEM);
594  }
595  }
596 
597  /* Detect flags */
598  c->flags = avctx->extradata[6];
599  if (c->flags & FLAG_MULTITHREAD)
600  av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
601  if (c->flags & FLAG_NULLFRAME)
602  av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
603  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
604  av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
605  if (c->flags & FLAGMASK_UNUSED)
606  av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
607 
608  /* If needed init zlib */
609 #if CONFIG_ZLIB_DECODER
610  if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
611  int zret;
612  c->zstream.zalloc = Z_NULL;
613  c->zstream.zfree = Z_NULL;
614  c->zstream.opaque = Z_NULL;
615  zret = inflateInit(&c->zstream);
616  if (zret != Z_OK) {
617  av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
618  av_freep(&c->decomp_buf);
619  return AVERROR_UNKNOWN;
620  }
621  }
622 #endif
623 
624  return 0;
625 }
626 
628 {
629  LclDecContext * const c = avctx->priv_data;
630 
631  av_freep(&c->decomp_buf);
632 #if CONFIG_ZLIB_DECODER
633  if (avctx->codec_id == AV_CODEC_ID_ZLIB)
634  inflateEnd(&c->zstream);
635 #endif
636 
637  return 0;
638 }
639 
640 #if CONFIG_MSZH_DECODER
642  .name = "mszh",
643  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
644  .type = AVMEDIA_TYPE_VIDEO,
645  .id = AV_CODEC_ID_MSZH,
646  .priv_data_size = sizeof(LclDecContext),
647  .init = decode_init,
648  .close = decode_end,
649  .decode = decode_frame,
651  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
652 };
653 #endif
654 
655 #if CONFIG_ZLIB_DECODER
657  .name = "zlib",
658  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
659  .type = AVMEDIA_TYPE_VIDEO,
660  .id = AV_CODEC_ID_ZLIB,
661  .priv_data_size = sizeof(LclDecContext),
662  .init = decode_init,
663  .close = decode_end,
664  .decode = decode_frame,
666  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
667 };
668 #endif
AVCodec ff_zlib_decoder
AVCodec ff_mszh_decoder
#define av_cold
Definition: attributes.h:88
uint8_t
Libavcodec external API header.
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RL32
Definition: intreadwrite.h:146
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define FFMIN(a, b)
Definition: common.h:105
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static AVFrame * frame
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:108
@ AV_CODEC_ID_ZLIB
Definition: codec_id.h:103
@ AV_CODEC_ID_MSZH
Definition: codec_id.h:102
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
Overlapping memcpy() implementation.
Definition: mem.c:428
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
#define FLAG_NULLFRAME
Definition: lcl.h:42
#define CODEC_ZLIB
Definition: lcl.h:47
#define COMP_ZLIB_HICOMP
Definition: lcl.h:38
#define IMGTYPE_YUV420
Definition: lcl.h:33
#define FLAG_PNGFILTER
Definition: lcl.h:43
#define COMP_ZLIB_NORMAL
Definition: lcl.h:39
#define FLAG_MULTITHREAD
Definition: lcl.h:41
#define COMP_MSZH_NOCOMP
Definition: lcl.h:36
#define IMGTYPE_YUV422
Definition: lcl.h:29
#define FLAGMASK_UNUSED
Definition: lcl.h:44
#define IMGTYPE_RGB24
Definition: lcl.h:30
#define COMP_ZLIB_HISPEED
Definition: lcl.h:37
#define IMGTYPE_YUV411
Definition: lcl.h:31
#define CODEC_MSZH
Definition: lcl.h:46
#define IMGTYPE_YUV111
Definition: lcl.h:28
#define IMGTYPE_YUV211
Definition: lcl.h:32
#define COMP_MSZH
Definition: lcl.h:35
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:473
static av_cold int decode_end(AVCodecContext *avctx)
Definition: lcldec.c:627
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: lcldec.c:158
#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:41
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define FF_PTR_ADD(ptr, off)
Definition: internal.h:105
static const uint16_t mask[17]
Definition: lzw.c:38
#define FFALIGN(x, a)
Definition: macros.h:48
Memory handling functions.
const char data[16]
Definition: mxf.c:142
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:2601
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
FF_ENABLE_DEPRECATION_WARNINGS 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:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
int width
picture width / height.
Definition: avcodec.h:709
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:637
enum AVCodecID codec_id
Definition: avcodec.h:546
int extradata_size
Definition: avcodec.h:638
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:396
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:401
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
int flags
Definition: lcldec.c:61
unsigned int decomp_size
Definition: lcldec.c:63
unsigned char * decomp_buf
Definition: lcldec.c:65
int imgtype
Definition: lcldec.c:57
int compression
Definition: lcldec.c:59
AVFrame * f
Definition: thread.h:35
#define avpriv_request_sample(...)
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
#define src
Definition: vp8dsp.c:255
#define height
#define width
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 const uint8_t offset[127][2]
Definition: vf_spp.c:107
int len
static double c[64]