FFmpeg  4.3
pngdec.c
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1 /*
2  * PNG image format
3  * Copyright (c) 2003 Fabrice Bellard
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 //#define DEBUG
23 
24 #include "libavutil/avassert.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/crc.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/stereo3d.h"
31 
32 #include "avcodec.h"
33 #include "bytestream.h"
34 #include "internal.h"
35 #include "apng.h"
36 #include "png.h"
37 #include "pngdsp.h"
38 #include "thread.h"
39 
40 #include <zlib.h>
41 
43  PNG_IHDR = 1 << 0,
44  PNG_PLTE = 1 << 1,
45 };
46 
48  PNG_IDAT = 1 << 0,
49  PNG_ALLIMAGE = 1 << 1,
50 };
51 
52 typedef struct PNGDecContext {
55 
60 
63  int width, height;
64  int cur_w, cur_h;
65  int last_w, last_h;
70  int bit_depth;
75  int channels;
77  int bpp;
78  int has_trns;
80 
83  uint32_t palette[256];
86  unsigned int last_row_size;
88  unsigned int tmp_row_size;
91  int pass;
92  int crow_size; /* compressed row size (include filter type) */
93  int row_size; /* decompressed row size */
94  int pass_row_size; /* decompress row size of the current pass */
95  int y;
96  z_stream zstream;
98 
99 /* Mask to determine which pixels are valid in a pass */
100 static const uint8_t png_pass_mask[NB_PASSES] = {
101  0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
102 };
103 
104 /* Mask to determine which y pixels can be written in a pass */
106  0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
107 };
108 
109 /* Mask to determine which pixels to overwrite while displaying */
111  0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
112 };
113 
114 /* NOTE: we try to construct a good looking image at each pass. width
115  * is the original image width. We also do pixel format conversion at
116  * this stage */
117 static void png_put_interlaced_row(uint8_t *dst, int width,
118  int bits_per_pixel, int pass,
119  int color_type, const uint8_t *src)
120 {
121  int x, mask, dsp_mask, j, src_x, b, bpp;
122  uint8_t *d;
123  const uint8_t *s;
124 
125  mask = png_pass_mask[pass];
126  dsp_mask = png_pass_dsp_mask[pass];
127 
128  switch (bits_per_pixel) {
129  case 1:
130  src_x = 0;
131  for (x = 0; x < width; x++) {
132  j = (x & 7);
133  if ((dsp_mask << j) & 0x80) {
134  b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
135  dst[x >> 3] &= 0xFF7F>>j;
136  dst[x >> 3] |= b << (7 - j);
137  }
138  if ((mask << j) & 0x80)
139  src_x++;
140  }
141  break;
142  case 2:
143  src_x = 0;
144  for (x = 0; x < width; x++) {
145  int j2 = 2 * (x & 3);
146  j = (x & 7);
147  if ((dsp_mask << j) & 0x80) {
148  b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
149  dst[x >> 2] &= 0xFF3F>>j2;
150  dst[x >> 2] |= b << (6 - j2);
151  }
152  if ((mask << j) & 0x80)
153  src_x++;
154  }
155  break;
156  case 4:
157  src_x = 0;
158  for (x = 0; x < width; x++) {
159  int j2 = 4*(x&1);
160  j = (x & 7);
161  if ((dsp_mask << j) & 0x80) {
162  b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
163  dst[x >> 1] &= 0xFF0F>>j2;
164  dst[x >> 1] |= b << (4 - j2);
165  }
166  if ((mask << j) & 0x80)
167  src_x++;
168  }
169  break;
170  default:
171  bpp = bits_per_pixel >> 3;
172  d = dst;
173  s = src;
174  for (x = 0; x < width; x++) {
175  j = x & 7;
176  if ((dsp_mask << j) & 0x80) {
177  memcpy(d, s, bpp);
178  }
179  d += bpp;
180  if ((mask << j) & 0x80)
181  s += bpp;
182  }
183  break;
184  }
185 }
186 
188  int w, int bpp)
189 {
190  int i;
191  for (i = 0; i < w; i++) {
192  int a, b, c, p, pa, pb, pc;
193 
194  a = dst[i - bpp];
195  b = top[i];
196  c = top[i - bpp];
197 
198  p = b - c;
199  pc = a - c;
200 
201  pa = abs(p);
202  pb = abs(pc);
203  pc = abs(p + pc);
204 
205  if (pa <= pb && pa <= pc)
206  p = a;
207  else if (pb <= pc)
208  p = b;
209  else
210  p = c;
211  dst[i] = p + src[i];
212  }
213 }
214 
215 #define UNROLL1(bpp, op) \
216  { \
217  r = dst[0]; \
218  if (bpp >= 2) \
219  g = dst[1]; \
220  if (bpp >= 3) \
221  b = dst[2]; \
222  if (bpp >= 4) \
223  a = dst[3]; \
224  for (; i <= size - bpp; i += bpp) { \
225  dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
226  if (bpp == 1) \
227  continue; \
228  dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
229  if (bpp == 2) \
230  continue; \
231  dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
232  if (bpp == 3) \
233  continue; \
234  dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
235  } \
236  }
237 
238 #define UNROLL_FILTER(op) \
239  if (bpp == 1) { \
240  UNROLL1(1, op) \
241  } else if (bpp == 2) { \
242  UNROLL1(2, op) \
243  } else if (bpp == 3) { \
244  UNROLL1(3, op) \
245  } else if (bpp == 4) { \
246  UNROLL1(4, op) \
247  } \
248  for (; i < size; i++) { \
249  dst[i] = op(dst[i - bpp], src[i], last[i]); \
250  }
251 
252 /* NOTE: 'dst' can be equal to 'last' */
254  uint8_t *src, uint8_t *last, int size, int bpp)
255 {
256  int i, p, r, g, b, a;
257 
258  switch (filter_type) {
260  memcpy(dst, src, size);
261  break;
263  for (i = 0; i < bpp; i++)
264  dst[i] = src[i];
265  if (bpp == 4) {
266  p = *(int *)dst;
267  for (; i < size; i += bpp) {
268  unsigned s = *(int *)(src + i);
269  p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
270  *(int *)(dst + i) = p;
271  }
272  } else {
273 #define OP_SUB(x, s, l) ((x) + (s))
275  }
276  break;
277  case PNG_FILTER_VALUE_UP:
278  dsp->add_bytes_l2(dst, src, last, size);
279  break;
281  for (i = 0; i < bpp; i++) {
282  p = (last[i] >> 1);
283  dst[i] = p + src[i];
284  }
285 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
287  break;
289  for (i = 0; i < bpp; i++) {
290  p = last[i];
291  dst[i] = p + src[i];
292  }
293  if (bpp > 2 && size > 4) {
294  /* would write off the end of the array if we let it process
295  * the last pixel with bpp=3 */
296  int w = (bpp & 3) ? size - 3 : size;
297 
298  if (w > i) {
299  dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
300  i = w;
301  }
302  }
303  ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
304  break;
305  }
306 }
307 
308 /* This used to be called "deloco" in FFmpeg
309  * and is actually an inverse reversible colorspace transformation */
310 #define YUV2RGB(NAME, TYPE) \
311 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
312 { \
313  int i; \
314  for (i = 0; i < size; i += 3 + alpha) { \
315  int g = dst [i + 1]; \
316  dst[i + 0] += g; \
317  dst[i + 2] += g; \
318  } \
319 }
320 
321 YUV2RGB(rgb8, uint8_t)
322 YUV2RGB(rgb16, uint16_t)
323 
325 {
326  if (s->interlace_type) {
327  return 100 - 100 * s->pass / (NB_PASSES - 1);
328  } else {
329  return 100 - 100 * s->y / s->cur_h;
330  }
331 }
332 
333 /* process exactly one decompressed row */
335 {
336  uint8_t *ptr, *last_row;
337  int got_line;
338 
339  if (!s->interlace_type) {
340  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
341  if (s->y == 0)
342  last_row = s->last_row;
343  else
344  last_row = ptr - s->image_linesize;
345 
346  png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
347  last_row, s->row_size, s->bpp);
348  /* loco lags by 1 row so that it doesn't interfere with top prediction */
349  if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
350  if (s->bit_depth == 16) {
351  deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2,
353  } else {
354  deloco_rgb8(ptr - s->image_linesize, s->row_size,
356  }
357  }
358  s->y++;
359  if (s->y == s->cur_h) {
360  s->pic_state |= PNG_ALLIMAGE;
361  if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
362  if (s->bit_depth == 16) {
363  deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
365  } else {
366  deloco_rgb8(ptr, s->row_size,
368  }
369  }
370  }
371  } else {
372  got_line = 0;
373  for (;;) {
374  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
375  if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
376  /* if we already read one row, it is time to stop to
377  * wait for the next one */
378  if (got_line)
379  break;
380  png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
381  s->last_row, s->pass_row_size, s->bpp);
382  FFSWAP(uint8_t *, s->last_row, s->tmp_row);
383  FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
384  got_line = 1;
385  }
386  if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
388  s->color_type, s->last_row);
389  }
390  s->y++;
391  if (s->y == s->cur_h) {
392  memset(s->last_row, 0, s->row_size);
393  for (;;) {
394  if (s->pass == NB_PASSES - 1) {
395  s->pic_state |= PNG_ALLIMAGE;
396  goto the_end;
397  } else {
398  s->pass++;
399  s->y = 0;
401  s->bits_per_pixel,
402  s->cur_w);
403  s->crow_size = s->pass_row_size + 1;
404  if (s->pass_row_size != 0)
405  break;
406  /* skip pass if empty row */
407  }
408  }
409  }
410  }
411 the_end:;
412  }
413 }
414 
415 static int png_decode_idat(PNGDecContext *s, int length)
416 {
417  int ret;
418  s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
419  s->zstream.next_in = s->gb.buffer;
420  bytestream2_skip(&s->gb, length);
421 
422  /* decode one line if possible */
423  while (s->zstream.avail_in > 0) {
424  ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
425  if (ret != Z_OK && ret != Z_STREAM_END) {
426  av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
427  return AVERROR_EXTERNAL;
428  }
429  if (s->zstream.avail_out == 0) {
430  if (!(s->pic_state & PNG_ALLIMAGE)) {
431  png_handle_row(s);
432  }
433  s->zstream.avail_out = s->crow_size;
434  s->zstream.next_out = s->crow_buf;
435  }
436  if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
438  "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
439  return 0;
440  }
441  }
442  return 0;
443 }
444 
445 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
446  const uint8_t *data_end)
447 {
448  z_stream zstream;
449  unsigned char *buf;
450  unsigned buf_size;
451  int ret;
452 
453  zstream.zalloc = ff_png_zalloc;
454  zstream.zfree = ff_png_zfree;
455  zstream.opaque = NULL;
456  if (inflateInit(&zstream) != Z_OK)
457  return AVERROR_EXTERNAL;
458  zstream.next_in = data;
459  zstream.avail_in = data_end - data;
461 
462  while (zstream.avail_in > 0) {
463  av_bprint_get_buffer(bp, 2, &buf, &buf_size);
464  if (buf_size < 2) {
465  ret = AVERROR(ENOMEM);
466  goto fail;
467  }
468  zstream.next_out = buf;
469  zstream.avail_out = buf_size - 1;
470  ret = inflate(&zstream, Z_PARTIAL_FLUSH);
471  if (ret != Z_OK && ret != Z_STREAM_END) {
472  ret = AVERROR_EXTERNAL;
473  goto fail;
474  }
475  bp->len += zstream.next_out - buf;
476  if (ret == Z_STREAM_END)
477  break;
478  }
479  inflateEnd(&zstream);
480  bp->str[bp->len] = 0;
481  return 0;
482 
483 fail:
484  inflateEnd(&zstream);
486  return ret;
487 }
488 
489 static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
490 {
491  size_t extra = 0, i;
492  uint8_t *out, *q;
493 
494  for (i = 0; i < size_in; i++)
495  extra += in[i] >= 0x80;
496  if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
497  return NULL;
498  q = out = av_malloc(size_in + extra + 1);
499  if (!out)
500  return NULL;
501  for (i = 0; i < size_in; i++) {
502  if (in[i] >= 0x80) {
503  *(q++) = 0xC0 | (in[i] >> 6);
504  *(q++) = 0x80 | (in[i] & 0x3F);
505  } else {
506  *(q++) = in[i];
507  }
508  }
509  *(q++) = 0;
510  return out;
511 }
512 
513 static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed,
514  AVDictionary **dict)
515 {
516  int ret, method;
517  const uint8_t *data = s->gb.buffer;
518  const uint8_t *data_end = data + length;
519  const uint8_t *keyword = data;
520  const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
521  uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
522  unsigned text_len;
523  AVBPrint bp;
524 
525  if (!keyword_end)
526  return AVERROR_INVALIDDATA;
527  data = keyword_end + 1;
528 
529  if (compressed) {
530  if (data == data_end)
531  return AVERROR_INVALIDDATA;
532  method = *(data++);
533  if (method)
534  return AVERROR_INVALIDDATA;
535  if ((ret = decode_zbuf(&bp, data, data_end)) < 0)
536  return ret;
537  text_len = bp.len;
538  ret = av_bprint_finalize(&bp, (char **)&text);
539  if (ret < 0)
540  return ret;
541  } else {
542  text = (uint8_t *)data;
543  text_len = data_end - text;
544  }
545 
546  kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
547  txt_utf8 = iso88591_to_utf8(text, text_len);
548  if (text != data)
549  av_free(text);
550  if (!(kw_utf8 && txt_utf8)) {
551  av_free(kw_utf8);
552  av_free(txt_utf8);
553  return AVERROR(ENOMEM);
554  }
555 
556  av_dict_set(dict, kw_utf8, txt_utf8,
558  return 0;
559 }
560 
562  uint32_t length)
563 {
564  if (length != 13)
565  return AVERROR_INVALIDDATA;
566 
567  if (s->pic_state & PNG_IDAT) {
568  av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
569  return AVERROR_INVALIDDATA;
570  }
571 
572  if (s->hdr_state & PNG_IHDR) {
573  av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
574  return AVERROR_INVALIDDATA;
575  }
576 
577  s->width = s->cur_w = bytestream2_get_be32(&s->gb);
578  s->height = s->cur_h = bytestream2_get_be32(&s->gb);
579  if (av_image_check_size(s->width, s->height, 0, avctx)) {
580  s->cur_w = s->cur_h = s->width = s->height = 0;
581  av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
582  return AVERROR_INVALIDDATA;
583  }
584  s->bit_depth = bytestream2_get_byte(&s->gb);
585  if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
586  s->bit_depth != 8 && s->bit_depth != 16) {
587  av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
588  goto error;
589  }
590  s->color_type = bytestream2_get_byte(&s->gb);
591  s->compression_type = bytestream2_get_byte(&s->gb);
592  if (s->compression_type) {
593  av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
594  goto error;
595  }
596  s->filter_type = bytestream2_get_byte(&s->gb);
597  s->interlace_type = bytestream2_get_byte(&s->gb);
598  bytestream2_skip(&s->gb, 4); /* crc */
599  s->hdr_state |= PNG_IHDR;
600  if (avctx->debug & FF_DEBUG_PICT_INFO)
601  av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
602  "compression_type=%d filter_type=%d interlace_type=%d\n",
603  s->width, s->height, s->bit_depth, s->color_type,
605 
606  return 0;
607 error:
608  s->cur_w = s->cur_h = s->width = s->height = 0;
609  s->bit_depth = 8;
610  return AVERROR_INVALIDDATA;
611 }
612 
614 {
615  if (s->pic_state & PNG_IDAT) {
616  av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
617  return AVERROR_INVALIDDATA;
618  }
619  avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb);
620  avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb);
621  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
622  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
623  bytestream2_skip(&s->gb, 1); /* unit specifier */
624  bytestream2_skip(&s->gb, 4); /* crc */
625 
626  return 0;
627 }
628 
630  uint32_t length, AVFrame *p)
631 {
632  int ret;
633  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
634 
635  if (!(s->hdr_state & PNG_IHDR)) {
636  av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
637  return AVERROR_INVALIDDATA;
638  }
639  if (!(s->pic_state & PNG_IDAT)) {
640  /* init image info */
641  ret = ff_set_dimensions(avctx, s->width, s->height);
642  if (ret < 0)
643  return ret;
644 
646  s->bits_per_pixel = s->bit_depth * s->channels;
647  s->bpp = (s->bits_per_pixel + 7) >> 3;
648  s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
649 
650  if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
652  avctx->pix_fmt = AV_PIX_FMT_RGB24;
653  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
655  avctx->pix_fmt = AV_PIX_FMT_RGBA;
656  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
658  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
659  } else if (s->bit_depth == 16 &&
661  avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
662  } else if (s->bit_depth == 16 &&
664  avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
665  } else if (s->bit_depth == 16 &&
667  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
668  } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
670  avctx->pix_fmt = AV_PIX_FMT_PAL8;
671  } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
672  avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
673  } else if (s->bit_depth == 8 &&
675  avctx->pix_fmt = AV_PIX_FMT_YA8;
676  } else if (s->bit_depth == 16 &&
678  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
679  } else {
681  "Bit depth %d color type %d",
682  s->bit_depth, s->color_type);
683  return AVERROR_PATCHWELCOME;
684  }
685 
686  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
687  switch (avctx->pix_fmt) {
688  case AV_PIX_FMT_RGB24:
689  avctx->pix_fmt = AV_PIX_FMT_RGBA;
690  break;
691 
692  case AV_PIX_FMT_RGB48BE:
693  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
694  break;
695 
696  case AV_PIX_FMT_GRAY8:
697  avctx->pix_fmt = AV_PIX_FMT_YA8;
698  break;
699 
700  case AV_PIX_FMT_GRAY16BE:
701  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
702  break;
703 
704  default:
705  avpriv_request_sample(avctx, "bit depth %d "
706  "and color type %d with TRNS",
707  s->bit_depth, s->color_type);
708  return AVERROR_INVALIDDATA;
709  }
710 
711  s->bpp += byte_depth;
712  }
713 
714  if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
715  return ret;
718  if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
719  return ret;
720  }
722  p->key_frame = 1;
724 
725  ff_thread_finish_setup(avctx);
726 
727  /* compute the compressed row size */
728  if (!s->interlace_type) {
729  s->crow_size = s->row_size + 1;
730  } else {
731  s->pass = 0;
733  s->bits_per_pixel,
734  s->cur_w);
735  s->crow_size = s->pass_row_size + 1;
736  }
737  ff_dlog(avctx, "row_size=%d crow_size =%d\n",
738  s->row_size, s->crow_size);
739  s->image_buf = p->data[0];
740  s->image_linesize = p->linesize[0];
741  /* copy the palette if needed */
742  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
743  memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
744  /* empty row is used if differencing to the first row */
746  if (!s->last_row)
747  return AVERROR_INVALIDDATA;
748  if (s->interlace_type ||
751  if (!s->tmp_row)
752  return AVERROR_INVALIDDATA;
753  }
754  /* compressed row */
756  if (!s->buffer)
757  return AVERROR(ENOMEM);
758 
759  /* we want crow_buf+1 to be 16-byte aligned */
760  s->crow_buf = s->buffer + 15;
761  s->zstream.avail_out = s->crow_size;
762  s->zstream.next_out = s->crow_buf;
763  }
764 
765  s->pic_state |= PNG_IDAT;
766 
767  /* set image to non-transparent bpp while decompressing */
769  s->bpp -= byte_depth;
770 
771  ret = png_decode_idat(s, length);
772 
774  s->bpp += byte_depth;
775 
776  if (ret < 0)
777  return ret;
778 
779  bytestream2_skip(&s->gb, 4); /* crc */
780 
781  return 0;
782 }
783 
785  uint32_t length)
786 {
787  int n, i, r, g, b;
788 
789  if ((length % 3) != 0 || length > 256 * 3)
790  return AVERROR_INVALIDDATA;
791  /* read the palette */
792  n = length / 3;
793  for (i = 0; i < n; i++) {
794  r = bytestream2_get_byte(&s->gb);
795  g = bytestream2_get_byte(&s->gb);
796  b = bytestream2_get_byte(&s->gb);
797  s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
798  }
799  for (; i < 256; i++)
800  s->palette[i] = (0xFFU << 24);
801  s->hdr_state |= PNG_PLTE;
802  bytestream2_skip(&s->gb, 4); /* crc */
803 
804  return 0;
805 }
806 
808  uint32_t length)
809 {
810  int v, i;
811 
812  if (!(s->hdr_state & PNG_IHDR)) {
813  av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
814  return AVERROR_INVALIDDATA;
815  }
816 
817  if (s->pic_state & PNG_IDAT) {
818  av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
819  return AVERROR_INVALIDDATA;
820  }
821 
823  if (length > 256 || !(s->hdr_state & PNG_PLTE))
824  return AVERROR_INVALIDDATA;
825 
826  for (i = 0; i < length; i++) {
827  unsigned v = bytestream2_get_byte(&s->gb);
828  s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
829  }
830  } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
831  if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
832  (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
833  s->bit_depth == 1)
834  return AVERROR_INVALIDDATA;
835 
836  for (i = 0; i < length / 2; i++) {
837  /* only use the least significant bits */
838  v = av_mod_uintp2(bytestream2_get_be16(&s->gb), s->bit_depth);
839 
840  if (s->bit_depth > 8)
841  AV_WB16(&s->transparent_color_be[2 * i], v);
842  else
843  s->transparent_color_be[i] = v;
844  }
845  } else {
846  return AVERROR_INVALIDDATA;
847  }
848 
849  bytestream2_skip(&s->gb, 4); /* crc */
850  s->has_trns = 1;
851 
852  return 0;
853 }
854 
855 static int decode_iccp_chunk(PNGDecContext *s, int length, AVFrame *f)
856 {
857  int ret, cnt = 0;
858  uint8_t *data, profile_name[82];
859  AVBPrint bp;
860  AVFrameSideData *sd;
861 
862  while ((profile_name[cnt++] = bytestream2_get_byte(&s->gb)) && cnt < 81);
863  if (cnt > 80) {
864  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
865  return AVERROR_INVALIDDATA;
866  }
867 
868  length = FFMAX(length - cnt, 0);
869 
870  if (bytestream2_get_byte(&s->gb) != 0) {
871  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
872  return AVERROR_INVALIDDATA;
873  }
874 
875  length = FFMAX(length - 1, 0);
876 
877  if ((ret = decode_zbuf(&bp, s->gb.buffer, s->gb.buffer + length)) < 0)
878  return ret;
879 
880  ret = av_bprint_finalize(&bp, (char **)&data);
881  if (ret < 0)
882  return ret;
883 
885  if (!sd) {
886  av_free(data);
887  return AVERROR(ENOMEM);
888  }
889 
890  av_dict_set(&sd->metadata, "name", profile_name, 0);
891  memcpy(sd->data, data, bp.len);
892  av_free(data);
893 
894  /* ICC compressed data and CRC */
895  bytestream2_skip(&s->gb, length + 4);
896 
897  return 0;
898 }
899 
901 {
902  if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
903  int i, j, k;
904  uint8_t *pd = p->data[0];
905  for (j = 0; j < s->height; j++) {
906  i = s->width / 8;
907  for (k = 7; k >= 1; k--)
908  if ((s->width&7) >= k)
909  pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
910  for (i--; i >= 0; i--) {
911  pd[8*i + 7]= pd[i] & 1;
912  pd[8*i + 6]= (pd[i]>>1) & 1;
913  pd[8*i + 5]= (pd[i]>>2) & 1;
914  pd[8*i + 4]= (pd[i]>>3) & 1;
915  pd[8*i + 3]= (pd[i]>>4) & 1;
916  pd[8*i + 2]= (pd[i]>>5) & 1;
917  pd[8*i + 1]= (pd[i]>>6) & 1;
918  pd[8*i + 0]= pd[i]>>7;
919  }
920  pd += s->image_linesize;
921  }
922  } else if (s->bits_per_pixel == 2) {
923  int i, j;
924  uint8_t *pd = p->data[0];
925  for (j = 0; j < s->height; j++) {
926  i = s->width / 4;
928  if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
929  if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
930  if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
931  for (i--; i >= 0; i--) {
932  pd[4*i + 3]= pd[i] & 3;
933  pd[4*i + 2]= (pd[i]>>2) & 3;
934  pd[4*i + 1]= (pd[i]>>4) & 3;
935  pd[4*i + 0]= pd[i]>>6;
936  }
937  } else {
938  if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
939  if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
940  if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
941  for (i--; i >= 0; i--) {
942  pd[4*i + 3]= ( pd[i] & 3)*0x55;
943  pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
944  pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
945  pd[4*i + 0]= ( pd[i]>>6 )*0x55;
946  }
947  }
948  pd += s->image_linesize;
949  }
950  } else if (s->bits_per_pixel == 4) {
951  int i, j;
952  uint8_t *pd = p->data[0];
953  for (j = 0; j < s->height; j++) {
954  i = s->width/2;
956  if (s->width&1) pd[2*i+0]= pd[i]>>4;
957  for (i--; i >= 0; i--) {
958  pd[2*i + 1] = pd[i] & 15;
959  pd[2*i + 0] = pd[i] >> 4;
960  }
961  } else {
962  if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
963  for (i--; i >= 0; i--) {
964  pd[2*i + 1] = (pd[i] & 15) * 0x11;
965  pd[2*i + 0] = (pd[i] >> 4) * 0x11;
966  }
967  }
968  pd += s->image_linesize;
969  }
970  }
971 }
972 
974  uint32_t length)
975 {
976  uint32_t sequence_number;
978 
979  if (length != 26)
980  return AVERROR_INVALIDDATA;
981 
982  if (!(s->hdr_state & PNG_IHDR)) {
983  av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
984  return AVERROR_INVALIDDATA;
985  }
986 
987  s->last_w = s->cur_w;
988  s->last_h = s->cur_h;
989  s->last_x_offset = s->x_offset;
990  s->last_y_offset = s->y_offset;
991  s->last_dispose_op = s->dispose_op;
992 
993  sequence_number = bytestream2_get_be32(&s->gb);
994  cur_w = bytestream2_get_be32(&s->gb);
995  cur_h = bytestream2_get_be32(&s->gb);
996  x_offset = bytestream2_get_be32(&s->gb);
997  y_offset = bytestream2_get_be32(&s->gb);
998  bytestream2_skip(&s->gb, 4); /* delay_num (2), delay_den (2) */
999  dispose_op = bytestream2_get_byte(&s->gb);
1000  blend_op = bytestream2_get_byte(&s->gb);
1001  bytestream2_skip(&s->gb, 4); /* crc */
1002 
1003  if (sequence_number == 0 &&
1004  (cur_w != s->width ||
1005  cur_h != s->height ||
1006  x_offset != 0 ||
1007  y_offset != 0) ||
1008  cur_w <= 0 || cur_h <= 0 ||
1009  x_offset < 0 || y_offset < 0 ||
1010  cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1011  return AVERROR_INVALIDDATA;
1012 
1013  if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1014  av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1015  return AVERROR_INVALIDDATA;
1016  }
1017 
1018  if ((sequence_number == 0 || !s->previous_picture.f->data[0]) &&
1019  dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1020  // No previous frame to revert to for the first frame
1021  // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1022  dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1023  }
1024 
1025  if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1026  avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1027  avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1028  avctx->pix_fmt == AV_PIX_FMT_PAL8 ||
1029  avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1030  avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1031  avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1032  )) {
1033  // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1034  blend_op = APNG_BLEND_OP_SOURCE;
1035  }
1036 
1037  s->cur_w = cur_w;
1038  s->cur_h = cur_h;
1039  s->x_offset = x_offset;
1040  s->y_offset = y_offset;
1041  s->dispose_op = dispose_op;
1042  s->blend_op = blend_op;
1043 
1044  return 0;
1045 }
1046 
1048 {
1049  int i, j;
1050  uint8_t *pd = p->data[0];
1051  uint8_t *pd_last = s->last_picture.f->data[0];
1052  int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
1053 
1054  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1055  for (j = 0; j < s->height; j++) {
1056  for (i = 0; i < ls; i++)
1057  pd[i] += pd_last[i];
1058  pd += s->image_linesize;
1059  pd_last += s->image_linesize;
1060  }
1061 }
1062 
1063 // divide by 255 and round to nearest
1064 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1065 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1066 
1068  AVFrame *p)
1069 {
1070  size_t x, y;
1071  uint8_t *buffer;
1072 
1073  if (s->blend_op == APNG_BLEND_OP_OVER &&
1074  avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1075  avctx->pix_fmt != AV_PIX_FMT_GRAY8A &&
1076  avctx->pix_fmt != AV_PIX_FMT_PAL8) {
1077  avpriv_request_sample(avctx, "Blending with pixel format %s",
1078  av_get_pix_fmt_name(avctx->pix_fmt));
1079  return AVERROR_PATCHWELCOME;
1080  }
1081 
1082  buffer = av_malloc_array(s->image_linesize, s->height);
1083  if (!buffer)
1084  return AVERROR(ENOMEM);
1085 
1086 
1087  // Do the disposal operation specified by the last frame on the frame
1089  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1090  memcpy(buffer, s->last_picture.f->data[0], s->image_linesize * s->height);
1091 
1093  for (y = s->last_y_offset; y < s->last_y_offset + s->last_h; ++y)
1094  memset(buffer + s->image_linesize * y + s->bpp * s->last_x_offset, 0, s->bpp * s->last_w);
1095 
1096  memcpy(s->previous_picture.f->data[0], buffer, s->image_linesize * s->height);
1098  } else {
1099  ff_thread_await_progress(&s->previous_picture, INT_MAX, 0);
1100  memcpy(buffer, s->previous_picture.f->data[0], s->image_linesize * s->height);
1101  }
1102 
1103  // Perform blending
1104  if (s->blend_op == APNG_BLEND_OP_SOURCE) {
1105  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1106  size_t row_start = s->image_linesize * y + s->bpp * s->x_offset;
1107  memcpy(buffer + row_start, p->data[0] + row_start, s->bpp * s->cur_w);
1108  }
1109  } else { // APNG_BLEND_OP_OVER
1110  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1111  uint8_t *foreground = p->data[0] + s->image_linesize * y + s->bpp * s->x_offset;
1112  uint8_t *background = buffer + s->image_linesize * y + s->bpp * s->x_offset;
1113  for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += s->bpp, background += s->bpp) {
1114  size_t b;
1115  uint8_t foreground_alpha, background_alpha, output_alpha;
1116  uint8_t output[10];
1117 
1118  // Since we might be blending alpha onto alpha, we use the following equations:
1119  // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1120  // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1121 
1122  switch (avctx->pix_fmt) {
1123  case AV_PIX_FMT_RGBA:
1124  foreground_alpha = foreground[3];
1125  background_alpha = background[3];
1126  break;
1127 
1128  case AV_PIX_FMT_GRAY8A:
1129  foreground_alpha = foreground[1];
1130  background_alpha = background[1];
1131  break;
1132 
1133  case AV_PIX_FMT_PAL8:
1134  foreground_alpha = s->palette[foreground[0]] >> 24;
1135  background_alpha = s->palette[background[0]] >> 24;
1136  break;
1137  }
1138 
1139  if (foreground_alpha == 0)
1140  continue;
1141 
1142  if (foreground_alpha == 255) {
1143  memcpy(background, foreground, s->bpp);
1144  continue;
1145  }
1146 
1147  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1148  // TODO: Alpha blending with PAL8 will likely need the entire image converted over to RGBA first
1149  avpriv_request_sample(avctx, "Alpha blending palette samples");
1150  background[0] = foreground[0];
1151  continue;
1152  }
1153 
1154  output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1155 
1156  av_assert0(s->bpp <= 10);
1157 
1158  for (b = 0; b < s->bpp - 1; ++b) {
1159  if (output_alpha == 0) {
1160  output[b] = 0;
1161  } else if (background_alpha == 255) {
1162  output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1163  } else {
1164  output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1165  }
1166  }
1167  output[b] = output_alpha;
1168  memcpy(background, output, s->bpp);
1169  }
1170  }
1171  }
1172 
1173  // Copy blended buffer into the frame and free
1174  memcpy(p->data[0], buffer, s->image_linesize * s->height);
1175  av_free(buffer);
1176 
1177  return 0;
1178 }
1179 
1181  AVFrame *p, AVPacket *avpkt)
1182 {
1183  const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1184  AVDictionary **metadatap = NULL;
1185  uint32_t tag, length;
1186  int decode_next_dat = 0;
1187  int i, ret;
1188 
1189  for (;;) {
1190  length = bytestream2_get_bytes_left(&s->gb);
1191  if (length <= 0) {
1192 
1193  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1194  avctx->skip_frame == AVDISCARD_ALL) {
1195  return 0;
1196  }
1197 
1198  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1199  if (!(s->pic_state & PNG_IDAT))
1200  return 0;
1201  else
1202  goto exit_loop;
1203  }
1204  av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1205  if ( s->pic_state & PNG_ALLIMAGE
1207  goto exit_loop;
1208  ret = AVERROR_INVALIDDATA;
1209  goto fail;
1210  }
1211 
1212  length = bytestream2_get_be32(&s->gb);
1213  if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) {
1214  av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1215  ret = AVERROR_INVALIDDATA;
1216  goto fail;
1217  }
1218  if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1219  uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1220  uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1221  if (crc_sig ^ crc_cal) {
1222  av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1223  if (avctx->err_recognition & AV_EF_EXPLODE) {
1224  av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1225  ret = AVERROR_INVALIDDATA;
1226  goto fail;
1227  }
1228  av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1229  bytestream2_skip(&s->gb, 4); /* tag */
1230  goto skip_tag;
1231  }
1232  }
1233  tag = bytestream2_get_le32(&s->gb);
1234  if (avctx->debug & FF_DEBUG_STARTCODE)
1235  av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1236  av_fourcc2str(tag), length);
1237 
1238  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1239  avctx->skip_frame == AVDISCARD_ALL) {
1240  switch(tag) {
1241  case MKTAG('I', 'H', 'D', 'R'):
1242  case MKTAG('p', 'H', 'Y', 's'):
1243  case MKTAG('t', 'E', 'X', 't'):
1244  case MKTAG('I', 'D', 'A', 'T'):
1245  case MKTAG('t', 'R', 'N', 'S'):
1246  break;
1247  default:
1248  goto skip_tag;
1249  }
1250  }
1251 
1252  metadatap = &p->metadata;
1253  switch (tag) {
1254  case MKTAG('I', 'H', 'D', 'R'):
1255  if ((ret = decode_ihdr_chunk(avctx, s, length)) < 0)
1256  goto fail;
1257  break;
1258  case MKTAG('p', 'H', 'Y', 's'):
1259  if ((ret = decode_phys_chunk(avctx, s)) < 0)
1260  goto fail;
1261  break;
1262  case MKTAG('f', 'c', 'T', 'L'):
1263  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1264  goto skip_tag;
1265  if ((ret = decode_fctl_chunk(avctx, s, length)) < 0)
1266  goto fail;
1267  decode_next_dat = 1;
1268  break;
1269  case MKTAG('f', 'd', 'A', 'T'):
1270  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1271  goto skip_tag;
1272  if (!decode_next_dat || length < 4) {
1273  ret = AVERROR_INVALIDDATA;
1274  goto fail;
1275  }
1276  bytestream2_get_be32(&s->gb);
1277  length -= 4;
1278  /* fallthrough */
1279  case MKTAG('I', 'D', 'A', 'T'):
1280  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1281  goto skip_tag;
1282  if ((ret = decode_idat_chunk(avctx, s, length, p)) < 0)
1283  goto fail;
1284  break;
1285  case MKTAG('P', 'L', 'T', 'E'):
1286  if (decode_plte_chunk(avctx, s, length) < 0)
1287  goto skip_tag;
1288  break;
1289  case MKTAG('t', 'R', 'N', 'S'):
1290  if (decode_trns_chunk(avctx, s, length) < 0)
1291  goto skip_tag;
1292  break;
1293  case MKTAG('t', 'E', 'X', 't'):
1294  if (decode_text_chunk(s, length, 0, metadatap) < 0)
1295  av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1296  bytestream2_skip(&s->gb, length + 4);
1297  break;
1298  case MKTAG('z', 'T', 'X', 't'):
1299  if (decode_text_chunk(s, length, 1, metadatap) < 0)
1300  av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1301  bytestream2_skip(&s->gb, length + 4);
1302  break;
1303  case MKTAG('s', 'T', 'E', 'R'): {
1304  int mode = bytestream2_get_byte(&s->gb);
1306  if (!stereo3d) {
1307  ret = AVERROR(ENOMEM);
1308  goto fail;
1309  }
1310 
1311  if (mode == 0 || mode == 1) {
1312  stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1313  stereo3d->flags = mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1314  } else {
1315  av_log(avctx, AV_LOG_WARNING,
1316  "Unknown value in sTER chunk (%d)\n", mode);
1317  }
1318  bytestream2_skip(&s->gb, 4); /* crc */
1319  break;
1320  }
1321  case MKTAG('i', 'C', 'C', 'P'): {
1322  if ((ret = decode_iccp_chunk(s, length, p)) < 0)
1323  goto fail;
1324  break;
1325  }
1326  case MKTAG('c', 'H', 'R', 'M'): {
1328  if (!mdm) {
1329  ret = AVERROR(ENOMEM);
1330  goto fail;
1331  }
1332 
1333  mdm->white_point[0] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1334  mdm->white_point[1] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1335 
1336  /* RGB Primaries */
1337  for (i = 0; i < 3; i++) {
1338  mdm->display_primaries[i][0] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1339  mdm->display_primaries[i][1] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1340  }
1341 
1342  mdm->has_primaries = 1;
1343  bytestream2_skip(&s->gb, 4); /* crc */
1344  break;
1345  }
1346  case MKTAG('g', 'A', 'M', 'A'): {
1347  AVBPrint bp;
1348  char *gamma_str;
1349  int num = bytestream2_get_be32(&s->gb);
1350 
1352  av_bprintf(&bp, "%i/%i", num, 100000);
1353  ret = av_bprint_finalize(&bp, &gamma_str);
1354  if (ret < 0)
1355  return ret;
1356 
1357  av_dict_set(&p->metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1358 
1359  bytestream2_skip(&s->gb, 4); /* crc */
1360  break;
1361  }
1362  case MKTAG('I', 'E', 'N', 'D'):
1363  if (!(s->pic_state & PNG_ALLIMAGE))
1364  av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1365  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1366  ret = AVERROR_INVALIDDATA;
1367  goto fail;
1368  }
1369  bytestream2_skip(&s->gb, 4); /* crc */
1370  goto exit_loop;
1371  default:
1372  /* skip tag */
1373 skip_tag:
1374  bytestream2_skip(&s->gb, length + 4);
1375  break;
1376  }
1377  }
1378 exit_loop:
1379 
1380  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1381  avctx->skip_frame == AVDISCARD_ALL) {
1382  return 0;
1383  }
1384 
1386  return AVERROR_INVALIDDATA;
1387 
1388  if (s->bits_per_pixel <= 4)
1389  handle_small_bpp(s, p);
1390 
1391  /* apply transparency if needed */
1392  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1393  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1394  size_t raw_bpp = s->bpp - byte_depth;
1395  unsigned x, y;
1396 
1397  av_assert0(s->bit_depth > 1);
1398 
1399  for (y = 0; y < s->height; ++y) {
1400  uint8_t *row = &s->image_buf[s->image_linesize * y];
1401 
1402  if (s->bpp == 2 && byte_depth == 1) {
1403  uint8_t *pixel = &row[2 * s->width - 1];
1404  uint8_t *rowp = &row[1 * s->width - 1];
1405  int tcolor = s->transparent_color_be[0];
1406  for (x = s->width; x > 0; --x) {
1407  *pixel-- = *rowp == tcolor ? 0 : 0xff;
1408  *pixel-- = *rowp--;
1409  }
1410  } else if (s->bpp == 4 && byte_depth == 1) {
1411  uint8_t *pixel = &row[4 * s->width - 1];
1412  uint8_t *rowp = &row[3 * s->width - 1];
1413  int tcolor = AV_RL24(s->transparent_color_be);
1414  for (x = s->width; x > 0; --x) {
1415  *pixel-- = AV_RL24(rowp-2) == tcolor ? 0 : 0xff;
1416  *pixel-- = *rowp--;
1417  *pixel-- = *rowp--;
1418  *pixel-- = *rowp--;
1419  }
1420  } else {
1421  /* since we're updating in-place, we have to go from right to left */
1422  for (x = s->width; x > 0; --x) {
1423  uint8_t *pixel = &row[s->bpp * (x - 1)];
1424  memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1425 
1426  if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1427  memset(&pixel[raw_bpp], 0, byte_depth);
1428  } else {
1429  memset(&pixel[raw_bpp], 0xff, byte_depth);
1430  }
1431  }
1432  }
1433  }
1434  }
1435 
1436  /* handle P-frames only if a predecessor frame is available */
1437  if (s->last_picture.f->data[0]) {
1438  if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1439  && s->last_picture.f->width == p->width
1440  && s->last_picture.f->height== p->height
1441  && s->last_picture.f->format== p->format
1442  ) {
1443  if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1444  handle_p_frame_png(s, p);
1445  else if (CONFIG_APNG_DECODER &&
1446  s->previous_picture.f->width == p->width &&
1447  s->previous_picture.f->height== p->height &&
1448  s->previous_picture.f->format== p->format &&
1449  avctx->codec_id == AV_CODEC_ID_APNG &&
1450  (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1451  goto fail;
1452  }
1453  }
1454  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1456 
1457  return 0;
1458 
1459 fail:
1460  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1462  return ret;
1463 }
1464 
1465 #if CONFIG_PNG_DECODER
1466 static int decode_frame_png(AVCodecContext *avctx,
1467  void *data, int *got_frame,
1468  AVPacket *avpkt)
1469 {
1470  PNGDecContext *const s = avctx->priv_data;
1471  const uint8_t *buf = avpkt->data;
1472  int buf_size = avpkt->size;
1473  AVFrame *p;
1474  int64_t sig;
1475  int ret;
1476 
1479  p = s->picture.f;
1480 
1481  bytestream2_init(&s->gb, buf, buf_size);
1482 
1483  /* check signature */
1484  sig = bytestream2_get_be64(&s->gb);
1485  if (sig != PNGSIG &&
1486  sig != MNGSIG) {
1487  av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1488  return AVERROR_INVALIDDATA;
1489  }
1490 
1491  s->y = s->has_trns = 0;
1492  s->hdr_state = 0;
1493  s->pic_state = 0;
1494 
1495  /* init the zlib */
1496  s->zstream.zalloc = ff_png_zalloc;
1497  s->zstream.zfree = ff_png_zfree;
1498  s->zstream.opaque = NULL;
1499  ret = inflateInit(&s->zstream);
1500  if (ret != Z_OK) {
1501  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1502  return AVERROR_EXTERNAL;
1503  }
1504 
1505  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1506  goto the_end;
1507 
1508  if (avctx->skip_frame == AVDISCARD_ALL) {
1509  *got_frame = 0;
1510  ret = bytestream2_tell(&s->gb);
1511  goto the_end;
1512  }
1513 
1514  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1515  goto the_end;
1516 
1517  *got_frame = 1;
1518 
1519  ret = bytestream2_tell(&s->gb);
1520 the_end:
1521  inflateEnd(&s->zstream);
1522  s->crow_buf = NULL;
1523  return ret;
1524 }
1525 #endif
1526 
1527 #if CONFIG_APNG_DECODER
1528 static int decode_frame_apng(AVCodecContext *avctx,
1529  void *data, int *got_frame,
1530  AVPacket *avpkt)
1531 {
1532  PNGDecContext *const s = avctx->priv_data;
1533  int ret;
1534  AVFrame *p;
1535 
1538  p = s->picture.f;
1539 
1540  if (!(s->hdr_state & PNG_IHDR)) {
1541  if (!avctx->extradata_size)
1542  return AVERROR_INVALIDDATA;
1543 
1544  /* only init fields, there is no zlib use in extradata */
1545  s->zstream.zalloc = ff_png_zalloc;
1546  s->zstream.zfree = ff_png_zfree;
1547 
1548  bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1549  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1550  goto end;
1551  }
1552 
1553  /* reset state for a new frame */
1554  if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1555  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1556  ret = AVERROR_EXTERNAL;
1557  goto end;
1558  }
1559  s->y = 0;
1560  s->pic_state = 0;
1561  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1562  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1563  goto end;
1564 
1565  if (!(s->pic_state & PNG_ALLIMAGE))
1566  av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1567  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1568  ret = AVERROR_INVALIDDATA;
1569  goto end;
1570  }
1571  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1572  goto end;
1573 
1574  *got_frame = 1;
1575  ret = bytestream2_tell(&s->gb);
1576 
1577 end:
1578  inflateEnd(&s->zstream);
1579  return ret;
1580 }
1581 #endif
1582 
1583 #if CONFIG_LSCR_DECODER
1584 static int decode_frame_lscr(AVCodecContext *avctx,
1585  void *data, int *got_frame,
1586  AVPacket *avpkt)
1587 {
1588  PNGDecContext *const s = avctx->priv_data;
1589  GetByteContext *gb = &s->gb;
1590  AVFrame *frame = data;
1591  int ret, nb_blocks, offset = 0;
1592 
1593  if (avpkt->size < 2)
1594  return AVERROR_INVALIDDATA;
1595 
1596  bytestream2_init(gb, avpkt->data, avpkt->size);
1597 
1598  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
1599  return ret;
1600 
1601  nb_blocks = bytestream2_get_le16(gb);
1602  if (bytestream2_get_bytes_left(gb) < 2 + nb_blocks * (12 + 8))
1603  return AVERROR_INVALIDDATA;
1604 
1605  if (s->last_picture.f->data[0]) {
1606  ret = av_frame_copy(frame, s->last_picture.f);
1607  if (ret < 0)
1608  return ret;
1609  }
1610 
1611  for (int b = 0; b < nb_blocks; b++) {
1612  int x, y, x2, y2, w, h, left;
1613  uint32_t csize, size;
1614 
1615  s->zstream.zalloc = ff_png_zalloc;
1616  s->zstream.zfree = ff_png_zfree;
1617  s->zstream.opaque = NULL;
1618 
1619  if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1620  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1621  ret = AVERROR_EXTERNAL;
1622  goto end;
1623  }
1624 
1625  bytestream2_seek(gb, 2 + b * 12, SEEK_SET);
1626 
1627  x = bytestream2_get_le16(gb);
1628  y = bytestream2_get_le16(gb);
1629  x2 = bytestream2_get_le16(gb);
1630  y2 = bytestream2_get_le16(gb);
1631  s->width = s->cur_w = w = x2-x;
1632  s->height = s->cur_h = h = y2-y;
1633 
1634  if (w <= 0 || x < 0 || x >= avctx->width || w + x > avctx->width ||
1635  h <= 0 || y < 0 || y >= avctx->height || h + y > avctx->height) {
1636  ret = AVERROR_INVALIDDATA;
1637  goto end;
1638  }
1639 
1640  size = bytestream2_get_le32(gb);
1641 
1642  frame->key_frame = (nb_blocks == 1) &&
1643  (w == avctx->width) &&
1644  (h == avctx->height) &&
1645  (x == 0) && (y == 0);
1646 
1647  bytestream2_seek(gb, 2 + nb_blocks * 12 + offset, SEEK_SET);
1648  csize = bytestream2_get_be32(gb);
1649  if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) {
1650  ret = AVERROR_INVALIDDATA;
1651  goto end;
1652  }
1653 
1654  offset += size;
1655  left = size;
1656 
1657  s->y = 0;
1658  s->row_size = w * 3;
1659 
1660  av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
1661  if (!s->buffer) {
1662  ret = AVERROR(ENOMEM);
1663  goto end;
1664  }
1665 
1667  if (!s->last_row) {
1668  ret = AVERROR(ENOMEM);
1669  goto end;
1670  }
1671 
1672  s->crow_size = w * 3 + 1;
1673  s->crow_buf = s->buffer + 15;
1674  s->zstream.avail_out = s->crow_size;
1675  s->zstream.next_out = s->crow_buf;
1676  s->image_buf = frame->data[0] + (avctx->height - y - 1) * frame->linesize[0] + x * 3;
1677  s->image_linesize =-frame->linesize[0];
1678  s->bpp = 3;
1679  s->pic_state = 0;
1680 
1681  while (left > 16) {
1682  ret = png_decode_idat(s, csize);
1683  if (ret < 0)
1684  goto end;
1685  left -= csize + 16;
1686  if (left > 16) {
1687  bytestream2_skip(gb, 4);
1688  csize = bytestream2_get_be32(gb);
1689  if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) {
1690  ret = AVERROR_INVALIDDATA;
1691  goto end;
1692  }
1693  }
1694  }
1695 
1696  inflateEnd(&s->zstream);
1697  }
1698 
1700 
1702  if ((ret = av_frame_ref(s->last_picture.f, frame)) < 0)
1703  return ret;
1704 
1705  *got_frame = 1;
1706 end:
1707  inflateEnd(&s->zstream);
1708 
1709  if (ret < 0)
1710  return ret;
1711  return avpkt->size;
1712 }
1713 
1714 static void decode_flush(AVCodecContext *avctx)
1715 {
1716  PNGDecContext *s = avctx->priv_data;
1717 
1719 }
1720 
1721 #endif
1722 
1723 #if HAVE_THREADS
1724 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1725 {
1726  PNGDecContext *psrc = src->priv_data;
1727  PNGDecContext *pdst = dst->priv_data;
1728  int ret;
1729 
1730  if (dst == src)
1731  return 0;
1732 
1733  ff_thread_release_buffer(dst, &pdst->picture);
1734  if (psrc->picture.f->data[0] &&
1735  (ret = ff_thread_ref_frame(&pdst->picture, &psrc->picture)) < 0)
1736  return ret;
1738  pdst->width = psrc->width;
1739  pdst->height = psrc->height;
1740  pdst->bit_depth = psrc->bit_depth;
1741  pdst->color_type = psrc->color_type;
1742  pdst->compression_type = psrc->compression_type;
1743  pdst->interlace_type = psrc->interlace_type;
1744  pdst->filter_type = psrc->filter_type;
1745  pdst->cur_w = psrc->cur_w;
1746  pdst->cur_h = psrc->cur_h;
1747  pdst->x_offset = psrc->x_offset;
1748  pdst->y_offset = psrc->y_offset;
1749  pdst->has_trns = psrc->has_trns;
1750  memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1751 
1752  pdst->dispose_op = psrc->dispose_op;
1753 
1754  memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1755 
1756  pdst->hdr_state |= psrc->hdr_state;
1757 
1759  if (psrc->last_picture.f->data[0] &&
1760  (ret = ff_thread_ref_frame(&pdst->last_picture, &psrc->last_picture)) < 0)
1761  return ret;
1762 
1764  if (psrc->previous_picture.f->data[0] &&
1765  (ret = ff_thread_ref_frame(&pdst->previous_picture, &psrc->previous_picture)) < 0)
1766  return ret;
1767  }
1768 
1769  return 0;
1770 }
1771 #endif
1772 
1774 {
1775  PNGDecContext *s = avctx->priv_data;
1776 
1777  avctx->color_range = AVCOL_RANGE_JPEG;
1778 
1779  if (avctx->codec_id == AV_CODEC_ID_LSCR)
1780  avctx->pix_fmt = AV_PIX_FMT_BGR24;
1781 
1782  s->avctx = avctx;
1784  s->last_picture.f = av_frame_alloc();
1785  s->picture.f = av_frame_alloc();
1786  if (!s->previous_picture.f || !s->last_picture.f || !s->picture.f) {
1789  av_frame_free(&s->picture.f);
1790  return AVERROR(ENOMEM);
1791  }
1792 
1793  ff_pngdsp_init(&s->dsp);
1794 
1795  return 0;
1796 }
1797 
1799 {
1800  PNGDecContext *s = avctx->priv_data;
1801 
1806  ff_thread_release_buffer(avctx, &s->picture);
1807  av_frame_free(&s->picture.f);
1808  av_freep(&s->buffer);
1809  s->buffer_size = 0;
1810  av_freep(&s->last_row);
1811  s->last_row_size = 0;
1812  av_freep(&s->tmp_row);
1813  s->tmp_row_size = 0;
1814 
1815  return 0;
1816 }
1817 
1818 #if CONFIG_APNG_DECODER
1820  .name = "apng",
1821  .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1822  .type = AVMEDIA_TYPE_VIDEO,
1823  .id = AV_CODEC_ID_APNG,
1824  .priv_data_size = sizeof(PNGDecContext),
1825  .init = png_dec_init,
1826  .close = png_dec_end,
1827  .decode = decode_frame_apng,
1828  .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1829  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1830  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
1832 };
1833 #endif
1834 
1835 #if CONFIG_PNG_DECODER
1837  .name = "png",
1838  .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1839  .type = AVMEDIA_TYPE_VIDEO,
1840  .id = AV_CODEC_ID_PNG,
1841  .priv_data_size = sizeof(PNGDecContext),
1842  .init = png_dec_init,
1843  .close = png_dec_end,
1844  .decode = decode_frame_png,
1845  .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1846  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1849 };
1850 #endif
1851 
1852 #if CONFIG_LSCR_DECODER
1854  .name = "lscr",
1855  .long_name = NULL_IF_CONFIG_SMALL("LEAD Screen Capture"),
1856  .type = AVMEDIA_TYPE_VIDEO,
1857  .id = AV_CODEC_ID_LSCR,
1858  .priv_data_size = sizeof(PNGDecContext),
1859  .init = png_dec_init,
1860  .close = png_dec_end,
1861  .decode = decode_frame_lscr,
1862  .flush = decode_flush,
1863  .capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1866 };
1867 #endif
#define AV_STEREO3D_FLAG_INVERT
Inverted views, Right/Bottom represents the left view.
Definition: stereo3d.h:167
static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length, AVFrame *p)
Definition: pngdec.c:629
static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:973
#define PNG_FILTER_VALUE_AVG
Definition: png.h:41
static void png_handle_row(PNGDecContext *s)
Definition: pngdec.c:334
ThreadFrame previous_picture
Definition: pngdec.c:57
#define NULL
Definition: coverity.c:32
int last_y_offset
Definition: pngdec.c:67
int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
Compute the size of an image line with format pix_fmt and width width for the plane plane...
Definition: imgutils.c:76
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
if(ret< 0)
Definition: vf_mcdeint.c:279
int width
Definition: pngdec.c:63
static void flush(AVCodecContext *avctx)
unsigned int tmp_row_size
Definition: pngdec.c:88
8 bits gray, 8 bits alpha
Definition: pixfmt.h:143
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
AVFrame * f
Definition: thread.h:35
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:104
const char * g
Definition: vf_curves.c:115
int pass_row_size
Definition: pngdec.c:94
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVDictionary * metadata
Definition: frame.h:210
uint8_t * tmp_row
Definition: pngdec.c:87
#define avpriv_request_sample(...)
PNGHeaderState
Definition: pngdec.c:42
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1161
AVRational white_point[2]
CIE 1931 xy chromaticity coords of white point.
int num
Numerator.
Definition: rational.h:59
static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed, AVDictionary **dict)
Definition: pngdec.c:513
int size
Definition: packet.h:356
const char * b
Definition: vf_curves.c:116
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:905
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:70
enum PNGImageState pic_state
Definition: pngdec.c:62
int has_primaries
Flag indicating whether the display primaries (and white point) are set.
discard all
Definition: avcodec.h:236
Views are next to each other.
Definition: stereo3d.h:67
#define PNG_COLOR_TYPE_RGB
Definition: png.h:33
static void error(const char *err)
void(* add_bytes_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition: pngdsp.h:28
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
Wait for earlier decoding threads to finish reference pictures.
#define PNG_COLOR_TYPE_GRAY_ALPHA
Definition: png.h:35
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:32
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
int filter_type
Definition: pngdec.c:74
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdec.c:187
#define AV_DICT_DONT_STRDUP_KEY
Take ownership of a key that&#39;s been allocated with av_malloc() or another memory allocation function...
Definition: dict.h:73
#define PNG_FILTER_VALUE_PAETH
Definition: png.h:42
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2004
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
static int percent_missing(PNGDecContext *s)
Definition: pngdec.c:324
#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
int y_offset
Definition: pngdec.c:66
uint8_t
#define av_cold
Definition: attributes.h:88
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define PNG_COLOR_TYPE_RGB_ALPHA
Definition: png.h:34
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
Stereo 3D type: this structure describes how two videos are packed within a single video surface...
Definition: stereo3d.h:176
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1612
#define f(width, name)
Definition: cbs_vp9.c:255
#define AV_RB32
Definition: intreadwrite.h:130
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
Multithreading support functions.
AVCodec ff_apng_decoder
packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is st...
Definition: pixfmt.h:205
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:444
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
static AVFrame * frame
Public header for CRC hash function implementation.
static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s)
Definition: pngdec.c:613
const char data[16]
Definition: mxf.c:91
Structure to hold side data for an AVFrame.
Definition: frame.h:206
uint8_t * data
Definition: packet.h:355
const uint8_t * buffer
Definition: bytestream.h:34
uint32_t tag
Definition: movenc.c:1532
int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
Definition: utils.c:1840
#define ff_dlog(a,...)
AVDictionary * metadata
metadata.
Definition: frame.h:586
static int decode_iccp_chunk(PNGDecContext *s, int length, AVFrame *f)
Definition: pngdec.c:855
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:447
AVCodec ff_lscr_decoder
unsigned int last_row_size
Definition: pngdec.c:86
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
int cur_h
Definition: pngdec.c:64
#define av_log(a,...)
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: internal.h:75
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:388
static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:784
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define U(x)
Definition: vp56_arith.h:37
#define src
Definition: vp8dsp.c:254
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
int width
Definition: frame.h:358
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static const uint8_t png_pass_dsp_mask[NB_PASSES]
Definition: pngdec.c:110
int flags
Additional information about the frame packing.
Definition: stereo3d.h:185
16 bits gray, 16 bits alpha (big-endian)
Definition: pixfmt.h:212
#define AV_BPRINT_SIZE_UNLIMITED
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p, AVPacket *avpkt)
Definition: pngdec.c:1180
static const uint16_t mask[17]
Definition: lzw.c:38
#define OP_SUB(x, s, l)
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1047
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
#define CONFIG_APNG_DECODER
Definition: config.h:740
uint8_t * crow_buf
Definition: pngdec.c:84
const char * r
Definition: vf_curves.c:114
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int pass
Definition: pngdec.c:91
int ff_png_get_nb_channels(int color_type)
Definition: png.c:49
ThreadFrame picture
Definition: pngdec.c:59
int height
Definition: pngdec.c:63
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
#define PNGSIG
Definition: png.h:47
simple assert() macros that are a bit more flexible than ISO C assert().
const char * name
Name of the codec implementation.
Definition: codec.h:197
int bits_per_pixel
Definition: pngdec.c:76
GetByteContext gb
Definition: pngdec.c:56
static const uint8_t offset[127][2]
Definition: vf_spp.c:93
#define FFMAX(a, b)
Definition: common.h:94
#define NB_PASSES
Definition: png.h:45
#define fail()
Definition: checkasm.h:123
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:106
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:800
uint8_t blend_op
Definition: pngdec.c:68
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:225
AVStereo3D * av_stereo3d_create_side_data(AVFrame *frame)
Allocate a complete AVFrameSideData and add it to the frame.
Definition: stereo3d.c:33
z_stream zstream
Definition: pngdec.c:96
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:282
AVMasteringDisplayMetadata * av_mastering_display_metadata_create_side_data(AVFrame *frame)
Allocate a complete AVMasteringDisplayMetadata and add it to the frame.
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:146
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1655
#define FFMIN(a, b)
Definition: common.h:96
#define PNG_FILTER_VALUE_SUB
Definition: png.h:39
uint32_t palette[256]
Definition: pngdec.c:83
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define PNG_COLOR_TYPE_GRAY
Definition: png.h:31
static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, uint8_t *src, uint8_t *last, int size, int bpp)
Definition: pngdec.c:253
int width
picture width / height.
Definition: avcodec.h:699
uint8_t w
Definition: llviddspenc.c:38
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
Notify later decoding threads when part of their reference picture is ready.
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:392
#define s(width, name)
Definition: cbs_vp9.c:257
uint8_t * last_row
Definition: pngdec.c:85
The data contains an ICC profile as an opaque octet buffer following the format described by ISO 1507...
Definition: frame.h:143
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1666
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AVCodecContext * avctx
Definition: pngdec.c:54
void av_bprint_get_buffer(AVBPrint *buf, unsigned size, unsigned char **mem, unsigned *actual_size)
Allocate bytes in the buffer for external use.
Definition: bprint.c:218
av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
Definition: pngdsp.c:43
static int decode_zbuf(AVBPrint *bp, const uint8_t *data, const uint8_t *data_end)
Definition: pngdec.c:445
int channels
Definition: pngdec.c:75
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:535
static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:561
static uint8_t * iso88591_to_utf8(const uint8_t *in, size_t size_in)
Definition: pngdec.c:489
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:373
static av_cold int png_dec_init(AVCodecContext *avctx)
Definition: pngdec.c:1773
enum AVStereo3DType type
How views are packed within the video.
Definition: stereo3d.h:180
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:2336
Libavcodec external API header.
enum PNGHeaderState hdr_state
Definition: pngdec.c:61
int buffer_size
Definition: pngdec.c:90
static int skip_tag(AVIOContext *in, int32_t tag_name)
Definition: ismindex.c:132
enum AVCodecID codec_id
Definition: avcodec.h:536
#define PNG_FILTER_VALUE_UP
Definition: png.h:40
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
#define PNG_FILTER_TYPE_LOCO
Definition: png.h:37
uint8_t last_dispose_op
Definition: pngdec.c:69
#define abs(x)
Definition: cuda_runtime.h:35
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
int debug
debug
Definition: avcodec.h:1611
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
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:551
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
uint8_t * data
Definition: frame.h:208
int interlace_type
Definition: pngdec.c:73
PNGImageState
Definition: pngdec.c:47
const uint8_t ff_png_pass_ymask[NB_PASSES]
Definition: png.c:25
int image_linesize
Definition: pngdec.c:82
int extradata_size
Definition: avcodec.h:628
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, int size)
Add a new side data to a frame.
Definition: frame.c:727
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:1592
Y , 16bpp, big-endian.
Definition: pixfmt.h:97
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
Rational number (pair of numerator and denominator).
Definition: rational.h:58
Mastering display metadata capable of representing the color volume of the display used to master the...
int cur_w
Definition: pngdec.c:64
#define CONFIG_PNG_DECODER
Definition: config.h:899
uint8_t transparent_color_be[6]
Definition: pngdec.c:79
#define OP_AVG(x, s, l)
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:1668
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
Definition: avcodec.h:1663
uint8_t * image_buf
Definition: pngdec.c:81
uint8_t dispose_op
Definition: pngdec.c:68
AVRational display_primaries[3][2]
CIE 1931 xy chromaticity coords of color primaries (r, g, b order).
uint8_t pixel
Definition: tiny_ssim.c:42
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define AV_RL24
Definition: intreadwrite.h:78
int last_x_offset
Definition: pngdec.c:67
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
#define FAST_DIV255(x)
Definition: pngdec.c:1065
static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1067
#define YUV2RGB(NAME, TYPE)
Definition: pngdec.c:310
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
static const uint8_t png_pass_mask[NB_PASSES]
Definition: pngdec.c:100
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:76
Y , 8bpp.
Definition: pixfmt.h:74
static av_cold int png_dec_end(AVCodecContext *avctx)
Definition: pngdec.c:1798
void(* add_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdsp.h:33
common internal api header.
static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:900
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
#define PNG_FILTER_VALUE_NONE
Definition: png.h:38
static double c[64]
static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:807
packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big...
Definition: pixfmt.h:102
int last_w
Definition: pngdec.c:65
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call...
Definition: utils.c:82
static const uint8_t png_pass_dsp_ymask[NB_PASSES]
Definition: pngdec.c:105
Stereoscopic video.
int den
Denominator.
Definition: rational.h:60
void ff_png_zfree(void *opaque, void *ptr)
Definition: png.c:44
void * priv_data
Definition: avcodec.h:553
static int png_decode_idat(PNGDecContext *s, int length)
Definition: pngdec.c:415
uint8_t * buffer
Definition: pngdec.c:89
#define av_free(p)
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1625
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
int row_size
Definition: pngdec.c:93
APNG common header.
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:208
PNGDSPContext dsp
Definition: pngdec.c:53
int compression_type
Definition: pngdec.c:72
int last_h
Definition: pngdec.c:65
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
Definition: png.c:62
int height
Definition: frame.h:358
FILE * out
Definition: movenc.c:54
int bit_depth
Definition: pngdec.c:70
#define av_freep(p)
int color_type
Definition: pngdec.c:71
ThreadFrame last_picture
Definition: pngdec.c:58
#define av_malloc_array(a, b)
static void png_put_interlaced_row(uint8_t *dst, int width, int bits_per_pixel, int pass, int color_type, const uint8_t *src)
Definition: pngdec.c:117
#define FFSWAP(type, a, b)
Definition: common.h:99
int crow_size
Definition: pngdec.c:92
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2465
static void decode_flush(AVCodecContext *avctx)
Definition: agm.c:1261
int x_offset
Definition: pngdec.c:66
#define MKTAG(a, b, c, d)
Definition: common.h:406
void * ff_png_zalloc(void *opaque, unsigned int items, unsigned int size)
Definition: png.c:39
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
This structure stores compressed data.
Definition: packet.h:332
int has_trns
Definition: pngdec.c:78
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:509
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
uint32_t AVCRC
Definition: crc.h:47
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1589
AVCodec ff_png_decoder
Predicted.
Definition: avutil.h:275
#define UNROLL_FILTER(op)
Definition: pngdec.c:238
#define MNGSIG
Definition: png.h:48