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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 #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 
50 #if CONFIG_ZLIB_DECODER
51 #include <zlib.h>
52 #endif
53 
54 typedef struct LclDecContext {
55  // Image type
56  int imgtype;
57  // Compression type
58  int compression;
59  // Flags
60  int flags;
61  // Decompressed data size
62  unsigned int decomp_size;
63  // Decompression buffer
64  unsigned char* decomp_buf;
65 #if CONFIG_ZLIB_DECODER
66  z_stream zstream;
67 #endif
68 } LclDecContext;
69 
70 
71 /**
72  * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
73  * @param destptr must be padded sufficiently for av_memcpy_backptr
74  */
75 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
76 {
77  unsigned char *destptr_bak = destptr;
78  unsigned char *destptr_end = destptr + destsize;
79  const unsigned char *srcptr_end = srcptr + srclen;
80  unsigned mask = *srcptr++;
81  unsigned maskbit = 0x80;
82 
83  while (srcptr < srcptr_end && destptr < destptr_end) {
84  if (!(mask & maskbit)) {
85  memcpy(destptr, srcptr, 4);
86  destptr += 4;
87  srcptr += 4;
88  } else {
89  unsigned ofs = bytestream_get_le16(&srcptr);
90  unsigned cnt = (ofs >> 11) + 1;
91  ofs &= 0x7ff;
92  ofs = FFMIN(ofs, destptr - destptr_bak);
93  cnt *= 4;
94  cnt = FFMIN(cnt, destptr_end - destptr);
95  if (ofs) {
96  av_memcpy_backptr(destptr, ofs, cnt);
97  } else {
98  // Not known what the correct behaviour is, but
99  // this at least avoids uninitialized data.
100  memset(destptr, 0, cnt);
101  }
102  destptr += cnt;
103  }
104  maskbit >>= 1;
105  if (!maskbit) {
106  mask = *srcptr++;
107  while (!mask) {
108  if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
109  memcpy(destptr, srcptr, 32);
110  destptr += 32;
111  srcptr += 32;
112  mask = *srcptr++;
113  }
114  maskbit = 0x80;
115  }
116  }
117 
118  return destptr - destptr_bak;
119 }
120 
121 
122 #if CONFIG_ZLIB_DECODER
123 /**
124  * @brief decompress a zlib-compressed data block into decomp_buf
125  * @param src compressed input buffer
126  * @param src_len data length in input buffer
127  * @param offset offset in decomp_buf
128  * @param expected expected decompressed length
129  */
130 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
131 {
132  LclDecContext *c = avctx->priv_data;
133  int zret = inflateReset(&c->zstream);
134  if (zret != Z_OK) {
135  av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
136  return AVERROR_UNKNOWN;
137  }
138  c->zstream.next_in = (uint8_t *)src;
139  c->zstream.avail_in = src_len;
140  c->zstream.next_out = c->decomp_buf + offset;
141  c->zstream.avail_out = c->decomp_size - offset;
142  zret = inflate(&c->zstream, Z_FINISH);
143  if (zret != Z_OK && zret != Z_STREAM_END) {
144  av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
145  return AVERROR_UNKNOWN;
146  }
147  if (expected != (unsigned int)c->zstream.total_out) {
148  av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
149  expected, c->zstream.total_out);
150  return AVERROR_UNKNOWN;
151  }
152  return c->zstream.total_out;
153 }
154 #endif
155 
156 
157 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
158 {
159  AVFrame *frame = data;
160  const uint8_t *buf = avpkt->data;
161  int buf_size = avpkt->size;
162  LclDecContext * const c = avctx->priv_data;
163  unsigned int pixel_ptr;
164  int row, col;
165  unsigned char *encoded = avpkt->data, *outptr;
166  uint8_t *y_out, *u_out, *v_out;
167  unsigned int width = avctx->width; // Real image width
168  unsigned int height = avctx->height; // Real image height
169  unsigned int mszh_dlen;
170  unsigned char yq, y1q, uq, vq;
171  int uqvq, ret;
172  unsigned int mthread_inlen, mthread_outlen;
173  unsigned int len = buf_size;
174  int linesize;
175 
176  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
177  return ret;
178 
179  outptr = frame->data[0]; // Output image pointer
180 
181  /* Decompress frame */
182  switch (avctx->codec_id) {
183  case AV_CODEC_ID_MSZH:
184  switch (c->compression) {
185  case COMP_MSZH:
186  if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
187  c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
188  ;
189  } else if (c->flags & FLAG_MULTITHREAD) {
190  mthread_inlen = AV_RL32(buf);
191  if (len < 8) {
192  av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
193  return AVERROR_INVALIDDATA;
194  }
195  mthread_inlen = FFMIN(mthread_inlen, len - 8);
196  mthread_outlen = AV_RL32(buf + 4);
197  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
198  mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
199  if (mthread_outlen != mszh_dlen) {
200  av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
201  mthread_outlen, mszh_dlen);
202  return AVERROR_INVALIDDATA;
203  }
204  mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
205  c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
206  if (mthread_outlen != mszh_dlen) {
207  av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
208  mthread_outlen, mszh_dlen);
209  return AVERROR_INVALIDDATA;
210  }
211  encoded = c->decomp_buf;
212  len = c->decomp_size;
213  } else {
214  mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
215  if (c->decomp_size != mszh_dlen) {
216  av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
217  c->decomp_size, mszh_dlen);
218  return AVERROR_INVALIDDATA;
219  }
220  encoded = c->decomp_buf;
221  len = mszh_dlen;
222  }
223  break;
224  case COMP_MSZH_NOCOMP: {
225  int bppx2;
226  switch (c->imgtype) {
227  case IMGTYPE_YUV111:
228  case IMGTYPE_RGB24:
229  bppx2 = 6;
230  break;
231  case IMGTYPE_YUV422:
232  case IMGTYPE_YUV211:
233  bppx2 = 4;
234  break;
235  case IMGTYPE_YUV411:
236  case IMGTYPE_YUV420:
237  bppx2 = 3;
238  break;
239  default:
240  bppx2 = 0; // will error out below
241  break;
242  }
243  if (len < ((width * height * bppx2) >> 1))
244  return AVERROR_INVALIDDATA;
245  break;
246  }
247  default:
248  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
249  return AVERROR_INVALIDDATA;
250  }
251  break;
252 #if CONFIG_ZLIB_DECODER
253  case AV_CODEC_ID_ZLIB:
254  /* Using the original dll with normal compression (-1) and RGB format
255  * gives a file with ZLIB fourcc, but frame is really uncompressed.
256  * To be sure that's true check also frame size */
257  if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
258  len == width * height * 3) {
259  if (c->flags & FLAG_PNGFILTER) {
260  memcpy(c->decomp_buf, buf, len);
261  encoded = c->decomp_buf;
262  } else {
263  break;
264  }
265  } else if (c->flags & FLAG_MULTITHREAD) {
266  mthread_inlen = AV_RL32(buf);
267  mthread_inlen = FFMIN(mthread_inlen, len - 8);
268  mthread_outlen = AV_RL32(buf + 4);
269  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
270  ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
271  if (ret < 0) return ret;
272  ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
273  mthread_outlen, mthread_outlen);
274  if (ret < 0) return ret;
275  } else {
276  int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
277  if (ret < 0) return ret;
278  }
279  encoded = c->decomp_buf;
280  len = c->decomp_size;
281  break;
282 #endif
283  default:
284  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
285  return AVERROR_INVALIDDATA;
286  }
287 
288 
289  /* Apply PNG filter */
290  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
291  switch (c->imgtype) {
292  case IMGTYPE_YUV111:
293  case IMGTYPE_RGB24:
294  for (row = 0; row < height; row++) {
295  pixel_ptr = row * width * 3;
296  yq = encoded[pixel_ptr++];
297  uqvq = AV_RL16(encoded+pixel_ptr);
298  pixel_ptr += 2;
299  for (col = 1; col < width; col++) {
300  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
301  uqvq -= AV_RL16(encoded+pixel_ptr+1);
302  AV_WL16(encoded+pixel_ptr+1, uqvq);
303  pixel_ptr += 3;
304  }
305  }
306  break;
307  case IMGTYPE_YUV422:
308  for (row = 0; row < height; row++) {
309  pixel_ptr = row * width * 2;
310  yq = uq = vq =0;
311  for (col = 0; col < width/4; col++) {
312  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
313  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
314  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
315  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
316  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
317  encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
318  encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
319  encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
320  pixel_ptr += 8;
321  }
322  }
323  break;
324  case IMGTYPE_YUV411:
325  for (row = 0; row < height; row++) {
326  pixel_ptr = row * width / 2 * 3;
327  yq = uq = vq =0;
328  for (col = 0; col < width/4; col++) {
329  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
330  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
331  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
332  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
333  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
334  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
335  pixel_ptr += 6;
336  }
337  }
338  break;
339  case IMGTYPE_YUV211:
340  for (row = 0; row < height; row++) {
341  pixel_ptr = row * width * 2;
342  yq = uq = vq =0;
343  for (col = 0; col < width/2; col++) {
344  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
345  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
346  encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
347  encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
348  pixel_ptr += 4;
349  }
350  }
351  break;
352  case IMGTYPE_YUV420:
353  for (row = 0; row < height/2; row++) {
354  pixel_ptr = row * width * 3;
355  yq = y1q = uq = vq =0;
356  for (col = 0; col < width/2; col++) {
357  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
358  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
359  encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
360  encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
361  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
362  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
363  pixel_ptr += 6;
364  }
365  }
366  break;
367  default:
368  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
369  return AVERROR_INVALIDDATA;
370  }
371  }
372 
373  /* Convert colorspace */
374  y_out = frame->data[0] + (height - 1) * frame->linesize[0];
375  u_out = frame->data[1] + (height - 1) * frame->linesize[1];
376  v_out = frame->data[2] + (height - 1) * frame->linesize[2];
377  switch (c->imgtype) {
378  case IMGTYPE_YUV111:
379  for (row = 0; row < height; row++) {
380  for (col = 0; col < width; col++) {
381  y_out[col] = *encoded++;
382  u_out[col] = *encoded++ + 128;
383  v_out[col] = *encoded++ + 128;
384  }
385  y_out -= frame->linesize[0];
386  u_out -= frame->linesize[1];
387  v_out -= frame->linesize[2];
388  }
389  break;
390  case IMGTYPE_YUV422:
391  for (row = 0; row < height; row++) {
392  for (col = 0; col < width - 3; col += 4) {
393  memcpy(y_out + col, encoded, 4);
394  encoded += 4;
395  u_out[ col >> 1 ] = *encoded++ + 128;
396  u_out[(col >> 1) + 1] = *encoded++ + 128;
397  v_out[ col >> 1 ] = *encoded++ + 128;
398  v_out[(col >> 1) + 1] = *encoded++ + 128;
399  }
400  y_out -= frame->linesize[0];
401  u_out -= frame->linesize[1];
402  v_out -= frame->linesize[2];
403  }
404  break;
405  case IMGTYPE_RGB24:
406  linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
407  for (row = height - 1; row >= 0; row--) {
408  pixel_ptr = row * frame->linesize[0];
409  memcpy(outptr + pixel_ptr, encoded, 3 * width);
410  encoded += linesize;
411  }
412  break;
413  case IMGTYPE_YUV411:
414  for (row = 0; row < height; row++) {
415  for (col = 0; col < width - 3; col += 4) {
416  memcpy(y_out + col, encoded, 4);
417  encoded += 4;
418  u_out[col >> 2] = *encoded++ + 128;
419  v_out[col >> 2] = *encoded++ + 128;
420  }
421  y_out -= frame->linesize[0];
422  u_out -= frame->linesize[1];
423  v_out -= frame->linesize[2];
424  }
425  break;
426  case IMGTYPE_YUV211:
427  for (row = 0; row < height; row++) {
428  for (col = 0; col < width - 1; col += 2) {
429  memcpy(y_out + col, encoded, 2);
430  encoded += 2;
431  u_out[col >> 1] = *encoded++ + 128;
432  v_out[col >> 1] = *encoded++ + 128;
433  }
434  y_out -= frame->linesize[0];
435  u_out -= frame->linesize[1];
436  v_out -= frame->linesize[2];
437  }
438  break;
439  case IMGTYPE_YUV420:
440  u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
441  v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
442  for (row = 0; row < height - 1; row += 2) {
443  for (col = 0; col < width - 1; col += 2) {
444  memcpy(y_out + col, encoded, 2);
445  encoded += 2;
446  memcpy(y_out + col - frame->linesize[0], encoded, 2);
447  encoded += 2;
448  u_out[col >> 1] = *encoded++ + 128;
449  v_out[col >> 1] = *encoded++ + 128;
450  }
451  y_out -= frame->linesize[0] << 1;
452  u_out -= frame->linesize[1];
453  v_out -= frame->linesize[2];
454  }
455  break;
456  default:
457  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
458  return AVERROR_INVALIDDATA;
459  }
460 
461  *got_frame = 1;
462 
463  /* always report that the buffer was completely consumed */
464  return buf_size;
465 }
466 
467 static av_cold int decode_init(AVCodecContext *avctx)
468 {
469  LclDecContext * const c = avctx->priv_data;
470  unsigned int basesize = avctx->width * avctx->height;
471  unsigned int max_basesize = FFALIGN(avctx->width, 4) *
472  FFALIGN(avctx->height, 4);
473  unsigned int max_decomp_size;
474  int subsample_h, subsample_v;
475 
476  if (avctx->extradata_size < 8) {
477  av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
478  return AVERROR_INVALIDDATA;
479  }
480 
481  /* Check codec type */
482  if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
483  (avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
484  av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
485  }
486 
487  /* Detect image type */
488  switch (c->imgtype = avctx->extradata[4]) {
489  case IMGTYPE_YUV111:
490  c->decomp_size = basesize * 3;
491  max_decomp_size = max_basesize * 3;
492  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
493  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
494  break;
495  case IMGTYPE_YUV422:
496  c->decomp_size = basesize * 2;
497  max_decomp_size = max_basesize * 2;
498  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
499  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
500  if (avctx->width % 4) {
501  avpriv_request_sample(avctx, "Unsupported dimensions");
502  return AVERROR_INVALIDDATA;
503  }
504  break;
505  case IMGTYPE_RGB24:
506  c->decomp_size = basesize * 3;
507  max_decomp_size = max_basesize * 3;
508  avctx->pix_fmt = AV_PIX_FMT_BGR24;
509  av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
510  break;
511  case IMGTYPE_YUV411:
512  c->decomp_size = basesize / 2 * 3;
513  max_decomp_size = max_basesize / 2 * 3;
514  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
515  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
516  break;
517  case IMGTYPE_YUV211:
518  c->decomp_size = basesize * 2;
519  max_decomp_size = max_basesize * 2;
520  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
521  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
522  break;
523  case IMGTYPE_YUV420:
524  c->decomp_size = basesize / 2 * 3;
525  max_decomp_size = max_basesize / 2 * 3;
526  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
527  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
528  break;
529  default:
530  av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
531  return AVERROR_INVALIDDATA;
532  }
533 
534  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
535  if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
536  avpriv_request_sample(avctx, "Unsupported dimensions");
537  return AVERROR_INVALIDDATA;
538  }
539 
540  /* Detect compression method */
541  c->compression = (int8_t)avctx->extradata[5];
542  switch (avctx->codec_id) {
543  case AV_CODEC_ID_MSZH:
544  switch (c->compression) {
545  case COMP_MSZH:
546  av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
547  break;
548  case COMP_MSZH_NOCOMP:
549  c->decomp_size = 0;
550  av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
551  break;
552  default:
553  av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
554  return AVERROR_INVALIDDATA;
555  }
556  break;
557 #if CONFIG_ZLIB_DECODER
558  case AV_CODEC_ID_ZLIB:
559  switch (c->compression) {
560  case COMP_ZLIB_HISPEED:
561  av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
562  break;
563  case COMP_ZLIB_HICOMP:
564  av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
565  break;
566  case COMP_ZLIB_NORMAL:
567  av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
568  break;
569  default:
570  if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
571  av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
572  return AVERROR_INVALIDDATA;
573  }
574  av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
575  }
576  break;
577 #endif
578  default:
579  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
580  return AVERROR_INVALIDDATA;
581  }
582 
583  /* Allocate decompression buffer */
584  if (c->decomp_size) {
585  if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
586  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
587  return AVERROR(ENOMEM);
588  }
589  }
590 
591  /* Detect flags */
592  c->flags = avctx->extradata[6];
593  if (c->flags & FLAG_MULTITHREAD)
594  av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
595  if (c->flags & FLAG_NULLFRAME)
596  av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
597  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
598  av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
599  if (c->flags & FLAGMASK_UNUSED)
600  av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
601 
602  /* If needed init zlib */
603 #if CONFIG_ZLIB_DECODER
604  if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
605  int zret;
606  c->zstream.zalloc = Z_NULL;
607  c->zstream.zfree = Z_NULL;
608  c->zstream.opaque = Z_NULL;
609  zret = inflateInit(&c->zstream);
610  if (zret != Z_OK) {
611  av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
612  av_freep(&c->decomp_buf);
613  return AVERROR_UNKNOWN;
614  }
615  }
616 #endif
617 
618  return 0;
619 }
620 
621 static av_cold int decode_end(AVCodecContext *avctx)
622 {
623  LclDecContext * const c = avctx->priv_data;
624 
625  av_freep(&c->decomp_buf);
626 #if CONFIG_ZLIB_DECODER
627  if (avctx->codec_id == AV_CODEC_ID_ZLIB)
628  inflateEnd(&c->zstream);
629 #endif
630 
631  return 0;
632 }
633 
634 #if CONFIG_MSZH_DECODER
635 AVCodec ff_mszh_decoder = {
636  .name = "mszh",
637  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
638  .type = AVMEDIA_TYPE_VIDEO,
639  .id = AV_CODEC_ID_MSZH,
640  .priv_data_size = sizeof(LclDecContext),
641  .init = decode_init,
642  .close = decode_end,
643  .decode = decode_frame,
644  .capabilities = AV_CODEC_CAP_DR1,
645 };
646 #endif
647 
648 #if CONFIG_ZLIB_DECODER
649 AVCodec ff_zlib_decoder = {
650  .name = "zlib",
651  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
652  .type = AVMEDIA_TYPE_VIDEO,
653  .id = AV_CODEC_ID_ZLIB,
654  .priv_data_size = sizeof(LclDecContext),
655  .init = decode_init,
656  .close = decode_end,
657  .decode = decode_frame,
658  .capabilities = AV_CODEC_CAP_DR1,
659 };
660 #endif
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
data
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
COMP_MSZH
#define COMP_MSZH
Definition: lcl.h:35
AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
mem.h
Memory handling functions.
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AV_CODEC_ID_ZLIB
Definition: avcodec.h:251
AVPacket::size
int size
Definition: avcodec.h:1602
COMP_ZLIB_HISPEED
#define COMP_ZLIB_HISPEED
Definition: lcl.h:37
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1904
LclDecContext::decomp_size
unsigned int decomp_size
Definition: lcldec.c:62
AVCodec
AVCodec.
Definition: avcodec.h:3600
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
avpriv_request_sample
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
uint8_t
Definition: audio_convert.c:194
FLAG_PNGFILTER
#define FLAG_PNGFILTER
Definition: lcl.h:43
av_cold
#define av_cold
Definition: attributes.h:82
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
IMGTYPE_YUV211
#define IMGTYPE_YUV211
Definition: lcl.h:32
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1791
COMP_ZLIB_NORMAL
#define COMP_ZLIB_NORMAL
Definition: lcl.h:39
frame
static AVFrame * frame
Definition: demuxing_decoding.c:53
LclDecContext::imgtype
int imgtype
Definition: lcldec.c:56
height
#define height
AVPacket::data
uint8_t * data
Definition: avcodec.h:1601
inflate
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)
Definition: vf_neighbor.c:129
IMGTYPE_YUV420
#define IMGTYPE_YUV420
Definition: lcl.h:33
av_memcpy_backptr
void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
Overlapping memcpy() implementation.
Definition: mem.c:430
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
IMGTYPE_YUV422
#define IMGTYPE_YUV422
Definition: lcl.h:29
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: lcldec.c:157
mask
static const uint16_t mask[17]
Definition: lzw.c:38
CODEC_ZLIB
#define CODEC_ZLIB
Definition: lcl.h:47
AVERROR
#define AVERROR(e)
Definition: error.h:43
av_pix_fmt_get_chroma_sub_sample
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:2294
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
IMGTYPE_RGB24
#define IMGTYPE_RGB24
Definition: lcl.h:30
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3607
offset
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
FLAGMASK_UNUSED
#define FLAGMASK_UNUSED
Definition: lcl.h:44
AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
IMGTYPE_YUV111
#define IMGTYPE_YUV111
Definition: lcl.h:28
AV_CODEC_ID_MSZH
Definition: avcodec.h:250
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
width
#define width
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1863
LclDecContext::compression
int compression
Definition: lcldec.c:58
AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
src
#define src
Definition: vp9dsp.c:530
IMGTYPE_YUV411
#define IMGTYPE_YUV411
Definition: lcl.h:31
CODEC_MSZH
#define CODEC_MSZH
Definition: lcl.h:46
LclDecContext::flags
int flags
Definition: lcldec.c:60
LclDecContext::decomp_buf
unsigned char * decomp_buf
Definition: lcldec.c:64
avcodec.h
Libavcodec external API header.
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1693
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
AVCodecContext
main external API structure.
Definition: avcodec.h:1676
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:947
COMP_ZLIB_HICOMP
#define COMP_ZLIB_HICOMP
Definition: lcl.h:38
buf
void * buf
Definition: avisynth_c.h:690
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:1792
FLAG_NULLFRAME
#define FLAG_NULLFRAME
Definition: lcl.h:42
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: lcldec.c:621
mszh_decomp
static unsigned int mszh_decomp(const unsigned char *srcptr, int srclen, unsigned char *destptr, unsigned int destsize)
Definition: lcldec.c:75
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: lcldec.c:467
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
internal.h
common internal api header.
c
static double c[64]
Definition: vsrc_mptestsrc.c:87
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:69
AVERROR_UNKNOWN
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1718
len
int len
Definition: vorbis_enc_data.h:452
FLAG_MULTITHREAD
#define FLAG_MULTITHREAD
Definition: lcl.h:41
COMP_MSZH_NOCOMP
#define COMP_MSZH_NOCOMP
Definition: lcl.h:36
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
decode
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2035
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:195
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1578
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959
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