FFmpeg  4.1.11
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 = (uint8_t *)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  if (expected > (unsigned int)c->zstream.total_out)
152  return (unsigned int)c->zstream.total_out;
153  return AVERROR_UNKNOWN;
154  }
155  return c->zstream.total_out;
156 }
157 #endif
158 
159 
160 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
161 {
162  AVFrame *frame = data;
163  ThreadFrame tframe = { .f = data };
164  const uint8_t *buf = avpkt->data;
165  int buf_size = avpkt->size;
166  LclDecContext * const c = avctx->priv_data;
167  unsigned int pixel_ptr;
168  int row, col;
169  unsigned char *encoded = avpkt->data, *outptr;
170  uint8_t *y_out, *u_out, *v_out;
171  int width = avctx->width; // Real image width
172  int height = avctx->height; // Real image height
173  unsigned int mszh_dlen;
174  unsigned char yq, y1q, uq, vq;
175  int uqvq, ret;
176  unsigned int mthread_inlen, mthread_outlen;
177  unsigned int len = buf_size;
178  int linesize;
179 
180  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
181  return ret;
182 
183  outptr = frame->data[0]; // Output image pointer
184 
185  /* Decompress frame */
186  switch (avctx->codec_id) {
187  case AV_CODEC_ID_MSZH:
188  switch (c->compression) {
189  case COMP_MSZH:
190  if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
191  c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
192  ;
193  } else if (c->flags & FLAG_MULTITHREAD) {
194  mthread_inlen = AV_RL32(buf);
195  if (len < 8) {
196  av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
197  return AVERROR_INVALIDDATA;
198  }
199  mthread_inlen = FFMIN(mthread_inlen, len - 8);
200  mthread_outlen = AV_RL32(buf + 4);
201  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
202  mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
203  if (mthread_outlen != mszh_dlen) {
204  av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
205  mthread_outlen, mszh_dlen);
206  return AVERROR_INVALIDDATA;
207  }
208  mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
209  c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
210  if (mthread_outlen != mszh_dlen) {
211  av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
212  mthread_outlen, mszh_dlen);
213  return AVERROR_INVALIDDATA;
214  }
215  encoded = c->decomp_buf;
216  len = c->decomp_size;
217  } else {
218  mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
219  if (c->decomp_size != mszh_dlen) {
220  av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
221  c->decomp_size, mszh_dlen);
222  return AVERROR_INVALIDDATA;
223  }
224  encoded = c->decomp_buf;
225  len = mszh_dlen;
226  }
227  break;
228  case COMP_MSZH_NOCOMP: {
229  int bppx2;
230  switch (c->imgtype) {
231  case IMGTYPE_YUV111:
232  case IMGTYPE_RGB24:
233  bppx2 = 6;
234  break;
235  case IMGTYPE_YUV422:
236  case IMGTYPE_YUV211:
237  bppx2 = 4;
238  break;
239  case IMGTYPE_YUV411:
240  case IMGTYPE_YUV420:
241  bppx2 = 3;
242  break;
243  default:
244  bppx2 = 0; // will error out below
245  break;
246  }
247  if (len < ((width * height * bppx2) >> 1))
248  return AVERROR_INVALIDDATA;
249  break;
250  }
251  default:
252  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
253  return AVERROR_INVALIDDATA;
254  }
255  break;
256 #if CONFIG_ZLIB_DECODER
257  case AV_CODEC_ID_ZLIB:
258  /* Using the original dll with normal compression (-1) and RGB format
259  * gives a file with ZLIB fourcc, but frame is really uncompressed.
260  * To be sure that's true check also frame size */
261  if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
262  len == width * height * 3) {
263  if (c->flags & FLAG_PNGFILTER) {
264  memcpy(c->decomp_buf, buf, len);
265  encoded = c->decomp_buf;
266  } else {
267  break;
268  }
269  } else if (c->flags & FLAG_MULTITHREAD) {
270  mthread_inlen = AV_RL32(buf);
271  mthread_inlen = FFMIN(mthread_inlen, len - 8);
272  mthread_outlen = AV_RL32(buf + 4);
273  mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
274  ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
275  if (ret < 0) return ret;
276  ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
277  mthread_outlen, mthread_outlen);
278  if (ret < 0) return ret;
279  len = c->decomp_size;
280  } else {
281  int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
282  if (ret < 0) return ret;
283  len = ret;
284  }
285  encoded = c->decomp_buf;
286  break;
287 #endif
288  default:
289  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
290  return AVERROR_INVALIDDATA;
291  }
292 
293 
294  /* Apply PNG filter */
295  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
296  switch (c->imgtype) {
297  case IMGTYPE_YUV111:
298  case IMGTYPE_RGB24:
299  for (row = 0; row < height; row++) {
300  pixel_ptr = row * width * 3;
301  yq = encoded[pixel_ptr++];
302  uqvq = AV_RL16(encoded+pixel_ptr);
303  pixel_ptr += 2;
304  for (col = 1; col < width; col++) {
305  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
306  uqvq -= AV_RL16(encoded+pixel_ptr+1);
307  AV_WL16(encoded+pixel_ptr+1, uqvq);
308  pixel_ptr += 3;
309  }
310  }
311  break;
312  case IMGTYPE_YUV422:
313  for (row = 0; row < height; row++) {
314  pixel_ptr = row * width * 2;
315  yq = uq = vq =0;
316  for (col = 0; col < width/4; col++) {
317  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
318  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
319  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
320  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
321  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
322  encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
323  encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
324  encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
325  pixel_ptr += 8;
326  }
327  }
328  break;
329  case IMGTYPE_YUV411:
330  for (row = 0; row < height; row++) {
331  pixel_ptr = row * width / 2 * 3;
332  yq = uq = vq =0;
333  for (col = 0; col < width/4; col++) {
334  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
335  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
336  encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
337  encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
338  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
339  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
340  pixel_ptr += 6;
341  }
342  }
343  break;
344  case IMGTYPE_YUV211:
345  for (row = 0; row < height; row++) {
346  pixel_ptr = row * width * 2;
347  yq = uq = vq =0;
348  for (col = 0; col < width/2; col++) {
349  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
350  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
351  encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
352  encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
353  pixel_ptr += 4;
354  }
355  }
356  break;
357  case IMGTYPE_YUV420:
358  for (row = 0; row < height/2; row++) {
359  pixel_ptr = row * width * 3;
360  yq = y1q = uq = vq =0;
361  for (col = 0; col < width/2; col++) {
362  encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
363  encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
364  encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
365  encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
366  encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
367  encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
368  pixel_ptr += 6;
369  }
370  }
371  break;
372  default:
373  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
374  return AVERROR_INVALIDDATA;
375  }
376  }
377 
378  /* Convert colorspace */
379  y_out = frame->data[0] + (height - 1) * frame->linesize[0];
380  u_out = frame->data[1] + (height - 1) * frame->linesize[1];
381  v_out = frame->data[2] + (height - 1) * frame->linesize[2];
382  switch (c->imgtype) {
383  case IMGTYPE_YUV111:
384  for (row = 0; row < height; row++) {
385  for (col = 0; col < width; col++) {
386  y_out[col] = *encoded++;
387  u_out[col] = *encoded++ + 128;
388  v_out[col] = *encoded++ + 128;
389  }
390  y_out -= frame->linesize[0];
391  u_out -= frame->linesize[1];
392  v_out -= frame->linesize[2];
393  }
394  break;
395  case IMGTYPE_YUV422:
396  for (row = 0; row < height; row++) {
397  for (col = 0; col < width - 3; col += 4) {
398  memcpy(y_out + col, encoded, 4);
399  encoded += 4;
400  u_out[ col >> 1 ] = *encoded++ + 128;
401  u_out[(col >> 1) + 1] = *encoded++ + 128;
402  v_out[ col >> 1 ] = *encoded++ + 128;
403  v_out[(col >> 1) + 1] = *encoded++ + 128;
404  }
405  if (col && col < width) {
406  u_out[ col >> 1 ] = u_out[(col>>1) - 1];
407  v_out[ col >> 1 ] = v_out[(col>>1) - 1];
408  }
409 
410  y_out -= frame->linesize[0];
411  u_out -= frame->linesize[1];
412  v_out -= frame->linesize[2];
413  }
414  break;
415  case IMGTYPE_RGB24:
416  linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
417  for (row = height - 1; row >= 0; row--) {
418  pixel_ptr = row * frame->linesize[0];
419  memcpy(outptr + pixel_ptr, encoded, 3 * width);
420  encoded += linesize;
421  }
422  break;
423  case IMGTYPE_YUV411:
424  for (row = 0; row < height; row++) {
425  for (col = 0; col < width - 3; col += 4) {
426  memcpy(y_out + col, encoded, 4);
427  encoded += 4;
428  u_out[col >> 2] = *encoded++ + 128;
429  v_out[col >> 2] = *encoded++ + 128;
430  }
431  if (col && col < width) {
432  u_out[col >> 2] = u_out[(col>>2) - 1];
433  v_out[col >> 2] = v_out[(col>>2) - 1];
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_YUV211:
441  for (row = 0; row < height; row++) {
442  for (col = 0; col < width - 1; col += 2) {
443  memcpy(y_out + col, encoded, 2);
444  encoded += 2;
445  u_out[col >> 1] = *encoded++ + 128;
446  v_out[col >> 1] = *encoded++ + 128;
447  }
448  y_out -= frame->linesize[0];
449  u_out -= frame->linesize[1];
450  v_out -= frame->linesize[2];
451  }
452  break;
453  case IMGTYPE_YUV420:
454  u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
455  v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
456  for (row = 0; row < height - 1; row += 2) {
457  for (col = 0; col < width - 1; col += 2) {
458  memcpy(y_out + col, encoded, 2);
459  encoded += 2;
460  memcpy(y_out + col - frame->linesize[0], encoded, 2);
461  encoded += 2;
462  u_out[col >> 1] = *encoded++ + 128;
463  v_out[col >> 1] = *encoded++ + 128;
464  }
465  y_out -= frame->linesize[0] << 1;
466  u_out -= frame->linesize[1];
467  v_out -= frame->linesize[2];
468  }
469  break;
470  default:
471  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
472  return AVERROR_INVALIDDATA;
473  }
474 
475  frame->key_frame = 1;
476  frame->pict_type = AV_PICTURE_TYPE_I;
477 
478  *got_frame = 1;
479 
480  /* always report that the buffer was completely consumed */
481  return buf_size;
482 }
483 
485 {
486  LclDecContext * const c = avctx->priv_data;
487  unsigned int basesize = avctx->width * avctx->height;
488  unsigned int max_basesize = FFALIGN(avctx->width, 4) *
489  FFALIGN(avctx->height, 4);
490  unsigned int max_decomp_size;
491  int subsample_h, subsample_v;
492  int partial_h_supported = 0;
493 
494  if (avctx->extradata_size < 8) {
495  av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
496  return AVERROR_INVALIDDATA;
497  }
498 
499  /* Check codec type */
500  if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
501  (avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
502  av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
503  }
504 
505  /* Detect image type */
506  switch (c->imgtype = avctx->extradata[4]) {
507  case IMGTYPE_YUV111:
508  c->decomp_size = basesize * 3;
509  max_decomp_size = max_basesize * 3;
510  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
511  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
512  break;
513  case IMGTYPE_YUV422:
514  c->decomp_size = (avctx->width & ~3) * avctx->height * 2;
515  max_decomp_size = max_basesize * 2;
516  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
517  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
518  partial_h_supported = 1;
519  break;
520  case IMGTYPE_RGB24:
521  c->decomp_size = FFALIGN(avctx->width*3, 4) * avctx->height;
522  max_decomp_size = max_basesize * 3;
523  avctx->pix_fmt = AV_PIX_FMT_BGR24;
524  av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
525  break;
526  case IMGTYPE_YUV411:
527  c->decomp_size = (avctx->width & ~3) * avctx->height / 2 * 3;
528  max_decomp_size = max_basesize / 2 * 3;
529  avctx->pix_fmt = AV_PIX_FMT_YUV411P;
530  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
531  partial_h_supported = 1;
532  break;
533  case IMGTYPE_YUV211:
534  c->decomp_size = basesize * 2;
535  max_decomp_size = max_basesize * 2;
536  avctx->pix_fmt = AV_PIX_FMT_YUV422P;
537  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
538  break;
539  case IMGTYPE_YUV420:
540  c->decomp_size = basesize / 2 * 3;
541  max_decomp_size = max_basesize / 2 * 3;
542  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
543  av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
544  break;
545  default:
546  av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
547  return AVERROR_INVALIDDATA;
548  }
549 
550  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
551  if ((avctx->width % (1<<subsample_h) && !partial_h_supported) || avctx->height % (1<<subsample_v)) {
552  avpriv_request_sample(avctx, "Unsupported dimensions");
553  return AVERROR_INVALIDDATA;
554  }
555 
556  /* Detect compression method */
557  c->compression = (int8_t)avctx->extradata[5];
558  switch (avctx->codec_id) {
559  case AV_CODEC_ID_MSZH:
560  switch (c->compression) {
561  case COMP_MSZH:
562  av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
563  break;
564  case COMP_MSZH_NOCOMP:
565  c->decomp_size = 0;
566  av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
567  break;
568  default:
569  av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
570  return AVERROR_INVALIDDATA;
571  }
572  break;
573 #if CONFIG_ZLIB_DECODER
574  case AV_CODEC_ID_ZLIB:
575  switch (c->compression) {
576  case COMP_ZLIB_HISPEED:
577  av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
578  break;
579  case COMP_ZLIB_HICOMP:
580  av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
581  break;
582  case COMP_ZLIB_NORMAL:
583  av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
584  break;
585  default:
586  if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
587  av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
588  return AVERROR_INVALIDDATA;
589  }
590  av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
591  }
592  break;
593 #endif
594  default:
595  av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
596  return AVERROR_INVALIDDATA;
597  }
598 
599  /* Allocate decompression buffer */
600  if (c->decomp_size) {
601  if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
602  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
603  return AVERROR(ENOMEM);
604  }
605  }
606 
607  /* Detect flags */
608  c->flags = avctx->extradata[6];
609  if (c->flags & FLAG_MULTITHREAD)
610  av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
611  if (c->flags & FLAG_NULLFRAME)
612  av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
613  if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
614  av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
615  if (c->flags & FLAGMASK_UNUSED)
616  av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
617 
618  /* If needed init zlib */
619 #if CONFIG_ZLIB_DECODER
620  if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
621  int zret;
622  c->zstream.zalloc = Z_NULL;
623  c->zstream.zfree = Z_NULL;
624  c->zstream.opaque = Z_NULL;
625  zret = inflateInit(&c->zstream);
626  if (zret != Z_OK) {
627  av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
628  av_freep(&c->decomp_buf);
629  return AVERROR_UNKNOWN;
630  }
631  }
632 #endif
633 
634  return 0;
635 }
636 
637 #if HAVE_THREADS
638 static int init_thread_copy(AVCodecContext *avctx)
639 {
640  return decode_init(avctx);
641 }
642 #endif
643 
645 {
646  LclDecContext * const c = avctx->priv_data;
647 
648  av_freep(&c->decomp_buf);
649 #if CONFIG_ZLIB_DECODER
650  if (avctx->codec_id == AV_CODEC_ID_ZLIB)
651  inflateEnd(&c->zstream);
652 #endif
653 
654  return 0;
655 }
656 
657 #if CONFIG_MSZH_DECODER
659  .name = "mszh",
660  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
661  .type = AVMEDIA_TYPE_VIDEO,
662  .id = AV_CODEC_ID_MSZH,
663  .priv_data_size = sizeof(LclDecContext),
664  .init = decode_init,
666  .close = decode_end,
667  .decode = decode_frame,
669  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
670 };
671 #endif
672 
673 #if CONFIG_ZLIB_DECODER
675  .name = "zlib",
676  .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
677  .type = AVMEDIA_TYPE_VIDEO,
678  .id = AV_CODEC_ID_ZLIB,
679  .priv_data_size = sizeof(LclDecContext),
680  .init = decode_init,
682  .close = decode_end,
683  .decode = decode_frame,
685  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
686 };
687 #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:226
#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
static int init_thread_copy(AVCodecContext *avctx)
Definition: tta.c:399
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: avcodec.h:1446
#define COMP_ZLIB_HISPEED
Definition: lcl.h:37
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1743
#define AV_RL16
Definition: intreadwrite.h:42
unsigned int decomp_size
Definition: lcldec.c:63
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3424
#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:82
#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:1634
#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: avcodec.h:1445
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)
Definition: vf_neighbor.c:189
#define IMGTYPE_YUV420
Definition: lcl.h:33
void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
Overlapping memcpy() implementation.
Definition: mem.c:426
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
#define IMGTYPE_YUV422
Definition: lcl.h:29
#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:160
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:2474
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
#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: avcodec.h:3431
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
#define FLAGMASK_UNUSED
Definition: lcl.h:44
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1024
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
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:227
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:309
#define FFMIN(a, b)
Definition: common.h:96
#define width
int width
picture width / height.
Definition: avcodec.h:1706
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:1543
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:257
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:1533
#define COMP_ZLIB_HICOMP
Definition: lcl.h:38
void * buf
Definition: avisynth_c.h:690
int extradata_size
Definition: avcodec.h:1635
#define FLAG_NULLFRAME
Definition: lcl.h:42
static av_cold int decode_end(AVCodecContext *avctx)
Definition: lcldec.c:644
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:484
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:240
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:1560
int len
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:304
#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: avcodec.h:1422
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:968