FFmpeg
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 "config_components.h"
25 
26 #include "libavutil/avassert.h"
27 #include "libavutil/bprint.h"
28 #include "libavutil/crc.h"
29 #include "libavutil/csp.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mem.h"
34 #include "libavutil/pixfmt.h"
35 #include "libavutil/rational.h"
36 #include "libavutil/stereo3d.h"
37 
38 #include "avcodec.h"
39 #include "bytestream.h"
40 #include "codec_internal.h"
41 #include "decode.h"
42 #include "apng.h"
43 #include "png.h"
44 #include "pngdsp.h"
45 #include "progressframe.h"
46 #include "thread.h"
47 #include "zlib_wrapper.h"
48 
49 #include <zlib.h>
50 
52  PNG_IHDR = 1 << 0,
53  PNG_PLTE = 1 << 1,
54 };
55 
57  PNG_IDAT = 1 << 0,
58  PNG_ALLIMAGE = 1 << 1,
59 };
60 
61 typedef struct PNGDecContext {
64 
68 
70 
71  uint8_t iccp_name[82];
72  uint8_t *iccp_data;
73  size_t iccp_data_len;
74 
76 
77  int have_chrm;
78  uint32_t white_point[2];
79  uint32_t display_primaries[3][2];
80  int gamma;
81  int have_srgb;
82  int have_cicp;
86  int have_clli;
87  uint32_t clli_max;
88  uint32_t clli_avg;
89  int have_mdvc;
90  uint16_t mdvc_primaries[3][2];
91  uint16_t mdvc_white_point[2];
92  uint32_t mdvc_max_lum;
93  uint32_t mdvc_min_lum;
94 
97  int width, height;
98  int cur_w, cur_h;
106  int channels;
108  int bpp;
109  int has_trns;
112 
113  uint32_t palette[256];
114  uint8_t *crow_buf;
115  uint8_t *last_row;
116  unsigned int last_row_size;
117  uint8_t *tmp_row;
118  unsigned int tmp_row_size;
119  uint8_t *buffer;
121  int pass;
122  int crow_size; /* compressed row size (include filter type) */
123  int row_size; /* decompressed row size */
124  int pass_row_size; /* decompress row size of the current pass */
125  int y;
127 } PNGDecContext;
128 
129 /* Mask to determine which pixels are valid in a pass */
130 static const uint8_t png_pass_mask[NB_PASSES] = {
131  0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
132 };
133 
134 /* Mask to determine which y pixels can be written in a pass */
135 static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
136  0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
137 };
138 
139 /* Mask to determine which pixels to overwrite while displaying */
140 static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
141  0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
142 };
143 
144 /* NOTE: we try to construct a good looking image at each pass. width
145  * is the original image width. We also do pixel format conversion at
146  * this stage */
147 static void png_put_interlaced_row(uint8_t *dst, int width,
148  int bits_per_pixel, int pass,
149  int color_type, const uint8_t *src)
150 {
151  int x, mask, dsp_mask, j, src_x, b, bpp;
152  uint8_t *d;
153  const uint8_t *s;
154 
155  mask = png_pass_mask[pass];
156  dsp_mask = png_pass_dsp_mask[pass];
157 
158  switch (bits_per_pixel) {
159  case 1:
160  src_x = 0;
161  for (x = 0; x < width; x++) {
162  j = (x & 7);
163  if ((dsp_mask << j) & 0x80) {
164  b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
165  dst[x >> 3] &= 0xFF7F>>j;
166  dst[x >> 3] |= b << (7 - j);
167  }
168  if ((mask << j) & 0x80)
169  src_x++;
170  }
171  break;
172  case 2:
173  src_x = 0;
174  for (x = 0; x < width; x++) {
175  int j2 = 2 * (x & 3);
176  j = (x & 7);
177  if ((dsp_mask << j) & 0x80) {
178  b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
179  dst[x >> 2] &= 0xFF3F>>j2;
180  dst[x >> 2] |= b << (6 - j2);
181  }
182  if ((mask << j) & 0x80)
183  src_x++;
184  }
185  break;
186  case 4:
187  src_x = 0;
188  for (x = 0; x < width; x++) {
189  int j2 = 4*(x&1);
190  j = (x & 7);
191  if ((dsp_mask << j) & 0x80) {
192  b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
193  dst[x >> 1] &= 0xFF0F>>j2;
194  dst[x >> 1] |= b << (4 - j2);
195  }
196  if ((mask << j) & 0x80)
197  src_x++;
198  }
199  break;
200  default:
201  bpp = bits_per_pixel >> 3;
202  d = dst;
203  s = src;
204  for (x = 0; x < width; x++) {
205  j = x & 7;
206  if ((dsp_mask << j) & 0x80) {
207  memcpy(d, s, bpp);
208  }
209  d += bpp;
210  if ((mask << j) & 0x80)
211  s += bpp;
212  }
213  break;
214  }
215 }
216 
217 void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
218  int w, int bpp)
219 {
220  int i;
221  for (i = 0; i < w; i++) {
222  int a, b, c, p, pa, pb, pc;
223 
224  a = dst[i - bpp];
225  b = top[i];
226  c = top[i - bpp];
227 
228  p = b - c;
229  pc = a - c;
230 
231  pa = abs(p);
232  pb = abs(pc);
233  pc = abs(p + pc);
234 
235  if (pa <= pb && pa <= pc)
236  p = a;
237  else if (pb <= pc)
238  p = b;
239  else
240  p = c;
241  dst[i] = p + src[i];
242  }
243 }
244 
245 #define UNROLL1(bpp, op) \
246  { \
247  r = dst[0]; \
248  if (bpp >= 2) \
249  g = dst[1]; \
250  if (bpp >= 3) \
251  b = dst[2]; \
252  if (bpp >= 4) \
253  a = dst[3]; \
254  for (; i <= size - bpp; i += bpp) { \
255  dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
256  if (bpp == 1) \
257  continue; \
258  dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
259  if (bpp == 2) \
260  continue; \
261  dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
262  if (bpp == 3) \
263  continue; \
264  dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
265  } \
266  }
267 
268 #define UNROLL_FILTER(op) \
269  if (bpp == 1) { \
270  UNROLL1(1, op) \
271  } else if (bpp == 2) { \
272  UNROLL1(2, op) \
273  } else if (bpp == 3) { \
274  UNROLL1(3, op) \
275  } else if (bpp == 4) { \
276  UNROLL1(4, op) \
277  } \
278  for (; i < size; i++) { \
279  dst[i] = op(dst[i - bpp], src[i], last[i]); \
280  }
281 
282 /* NOTE: 'dst' can be equal to 'last' */
283 void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
284  uint8_t *src, uint8_t *last, int size, int bpp)
285 {
286  int i, p, r, g, b, a;
287 
288  switch (filter_type) {
290  memcpy(dst, src, size);
291  break;
293  for (i = 0; i < bpp; i++)
294  dst[i] = src[i];
295  if (bpp == 4) {
296  p = *(int *)dst;
297  for (; i < size; i += bpp) {
298  unsigned s = *(int *)(src + i);
299  p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
300  *(int *)(dst + i) = p;
301  }
302  } else {
303 #define OP_SUB(x, s, l) ((x) + (s))
305  }
306  break;
307  case PNG_FILTER_VALUE_UP:
308  dsp->add_bytes_l2(dst, src, last, size);
309  break;
311  for (i = 0; i < bpp; i++) {
312  p = (last[i] >> 1);
313  dst[i] = p + src[i];
314  }
315 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
317  break;
319  for (i = 0; i < bpp; i++) {
320  p = last[i];
321  dst[i] = p + src[i];
322  }
323  if (bpp > 2 && size > 4) {
324  /* would write off the end of the array if we let it process
325  * the last pixel with bpp=3 */
326  int w = (bpp & 3) ? size - 3 : size;
327 
328  if (w > i) {
329  dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
330  i = w;
331  }
332  }
333  ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
334  break;
335  }
336 }
337 
338 /* This used to be called "deloco" in FFmpeg
339  * and is actually an inverse reversible colorspace transformation */
340 #define YUV2RGB(NAME, TYPE) \
341 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
342 { \
343  int i; \
344  for (i = 0; i < size - 2; i += 3 + alpha) { \
345  int g = dst [i + 1]; \
346  dst[i + 0] += g; \
347  dst[i + 2] += g; \
348  } \
349 }
350 
351 YUV2RGB(rgb8, uint8_t)
352 YUV2RGB(rgb16, uint16_t)
353 
355 {
356  if (s->interlace_type) {
357  return 100 - 100 * s->pass / (NB_PASSES - 1);
358  } else {
359  return 100 - 100 * s->y / s->cur_h;
360  }
361 }
362 
363 /* process exactly one decompressed row */
364 static void png_handle_row(PNGDecContext *s, uint8_t *dst, ptrdiff_t dst_stride)
365 {
366  uint8_t *ptr, *last_row;
367  int got_line;
368 
369  if (!s->interlace_type) {
370  ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
371  if (s->y == 0)
372  last_row = s->last_row;
373  else
374  last_row = ptr - dst_stride;
375 
376  ff_png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
377  last_row, s->row_size, s->bpp);
378  /* loco lags by 1 row so that it doesn't interfere with top prediction */
379  if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
380  if (s->bit_depth == 16) {
381  deloco_rgb16((uint16_t *)(ptr - dst_stride), s->row_size / 2,
382  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
383  } else {
384  deloco_rgb8(ptr - dst_stride, s->row_size,
385  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
386  }
387  }
388  s->y++;
389  if (s->y == s->cur_h) {
390  s->pic_state |= PNG_ALLIMAGE;
391  if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
392  if (s->bit_depth == 16) {
393  deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
394  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
395  } else {
396  deloco_rgb8(ptr, s->row_size,
397  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
398  }
399  }
400  }
401  } else {
402  got_line = 0;
403  for (;;) {
404  ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
405  if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
406  /* if we already read one row, it is time to stop to
407  * wait for the next one */
408  if (got_line)
409  break;
410  ff_png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
411  s->last_row, s->pass_row_size, s->bpp);
412  FFSWAP(uint8_t *, s->last_row, s->tmp_row);
413  FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
414  got_line = 1;
415  }
416  if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
417  png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
418  s->color_type, s->last_row);
419  }
420  s->y++;
421  if (s->y == s->cur_h) {
422  memset(s->last_row, 0, s->row_size);
423  for (;;) {
424  if (s->pass == NB_PASSES - 1) {
425  s->pic_state |= PNG_ALLIMAGE;
426  goto the_end;
427  } else {
428  s->pass++;
429  s->y = 0;
430  s->pass_row_size = ff_png_pass_row_size(s->pass,
431  s->bits_per_pixel,
432  s->cur_w);
433  s->crow_size = s->pass_row_size + 1;
434  if (s->pass_row_size != 0)
435  break;
436  /* skip pass if empty row */
437  }
438  }
439  }
440  }
441 the_end:;
442  }
443 }
444 
446  uint8_t *dst, ptrdiff_t dst_stride)
447 {
448  z_stream *const zstream = &s->zstream.zstream;
449  int ret;
450  zstream->avail_in = bytestream2_get_bytes_left(gb);
451  zstream->next_in = gb->buffer;
452 
453  /* decode one line if possible */
454  while (zstream->avail_in > 0) {
455  ret = inflate(zstream, Z_PARTIAL_FLUSH);
456  if (ret != Z_OK && ret != Z_STREAM_END) {
457  av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
458  return AVERROR_EXTERNAL;
459  }
460  if (zstream->avail_out == 0) {
461  if (!(s->pic_state & PNG_ALLIMAGE)) {
462  png_handle_row(s, dst, dst_stride);
463  }
464  zstream->avail_out = s->crow_size;
465  zstream->next_out = s->crow_buf;
466  }
467  if (ret == Z_STREAM_END && zstream->avail_in > 0) {
468  av_log(s->avctx, AV_LOG_WARNING,
469  "%d undecompressed bytes left in buffer\n", zstream->avail_in);
470  return 0;
471  }
472  }
473  return 0;
474 }
475 
476 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
477  const uint8_t *data_end, void *logctx)
478 {
479  FFZStream z;
480  z_stream *const zstream = &z.zstream;
481  unsigned char *buf;
482  unsigned buf_size;
483  int ret = ff_inflate_init(&z, logctx);
484  if (ret < 0)
485  return ret;
486 
487  zstream->next_in = data;
488  zstream->avail_in = data_end - data;
490 
491  while (zstream->avail_in > 0) {
492  av_bprint_get_buffer(bp, 2, &buf, &buf_size);
493  if (buf_size < 2) {
494  ret = AVERROR(ENOMEM);
495  goto fail;
496  }
497  zstream->next_out = buf;
498  zstream->avail_out = buf_size - 1;
499  ret = inflate(zstream, Z_PARTIAL_FLUSH);
500  if (ret != Z_OK && ret != Z_STREAM_END) {
502  goto fail;
503  }
504  bp->len += zstream->next_out - buf;
505  if (ret == Z_STREAM_END)
506  break;
507  }
508  ff_inflate_end(&z);
509  bp->str[bp->len] = 0;
510  return 0;
511 
512 fail:
513  ff_inflate_end(&z);
515  return ret;
516 }
517 
518 static char *iso88591_to_utf8(const char *in, size_t size_in)
519 {
520  size_t extra = 0, i;
521  char *out, *q;
522 
523  for (i = 0; i < size_in; i++)
524  extra += !!(in[i] & 0x80);
525  if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
526  return NULL;
527  q = out = av_malloc(size_in + extra + 1);
528  if (!out)
529  return NULL;
530  for (i = 0; i < size_in; i++) {
531  if (in[i] & 0x80) {
532  *(q++) = 0xC0 | (in[i] >> 6);
533  *(q++) = 0x80 | (in[i] & 0x3F);
534  } else {
535  *(q++) = in[i];
536  }
537  }
538  *(q++) = 0;
539  return out;
540 }
541 
542 static int decode_text_chunk(PNGDecContext *s, GetByteContext *gb, int compressed)
543 {
544  int ret, method;
545  const uint8_t *data = gb->buffer;
546  const uint8_t *data_end = gb->buffer_end;
547  const char *keyword = data;
548  const char *keyword_end = memchr(keyword, 0, data_end - data);
549  char *kw_utf8 = NULL, *txt_utf8 = NULL;
550  const char *text;
551  unsigned text_len;
552  AVBPrint bp;
553 
554  if (!keyword_end)
555  return AVERROR_INVALIDDATA;
556  data = keyword_end + 1;
557 
558  if (compressed) {
559  if (data == data_end)
560  return AVERROR_INVALIDDATA;
561  method = *(data++);
562  if (method)
563  return AVERROR_INVALIDDATA;
564  if ((ret = decode_zbuf(&bp, data, data_end, s->avctx)) < 0)
565  return ret;
566  text = bp.str;
567  text_len = bp.len;
568  } else {
569  text = data;
570  text_len = data_end - data;
571  }
572 
573  txt_utf8 = iso88591_to_utf8(text, text_len);
574  if (compressed)
575  av_bprint_finalize(&bp, NULL);
576  if (!txt_utf8)
577  return AVERROR(ENOMEM);
578  kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
579  if (!kw_utf8) {
580  av_free(txt_utf8);
581  return AVERROR(ENOMEM);
582  }
583 
584  av_dict_set(&s->frame_metadata, kw_utf8, txt_utf8,
586  return 0;
587 }
588 
590  GetByteContext *gb)
591 {
592  if (bytestream2_get_bytes_left(gb) != 13)
593  return AVERROR_INVALIDDATA;
594 
595  if (s->pic_state & PNG_IDAT) {
596  av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
597  return AVERROR_INVALIDDATA;
598  }
599 
600  if (s->hdr_state & PNG_IHDR) {
601  av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
602  return AVERROR_INVALIDDATA;
603  }
604 
605  s->width = s->cur_w = bytestream2_get_be32(gb);
606  s->height = s->cur_h = bytestream2_get_be32(gb);
607  if (av_image_check_size(s->width, s->height, 0, avctx)) {
608  s->cur_w = s->cur_h = s->width = s->height = 0;
609  av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
610  return AVERROR_INVALIDDATA;
611  }
612  s->bit_depth = bytestream2_get_byte(gb);
613  if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
614  s->bit_depth != 8 && s->bit_depth != 16) {
615  av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
616  goto error;
617  }
618  s->color_type = bytestream2_get_byte(gb);
619  s->compression_type = bytestream2_get_byte(gb);
620  if (s->compression_type) {
621  av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
622  goto error;
623  }
624  s->filter_type = bytestream2_get_byte(gb);
625  s->interlace_type = bytestream2_get_byte(gb);
626  s->hdr_state |= PNG_IHDR;
627  if (avctx->debug & FF_DEBUG_PICT_INFO)
628  av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
629  "compression_type=%d filter_type=%d interlace_type=%d\n",
630  s->width, s->height, s->bit_depth, s->color_type,
631  s->compression_type, s->filter_type, s->interlace_type);
632 
633  return 0;
634 error:
635  s->cur_w = s->cur_h = s->width = s->height = 0;
636  s->bit_depth = 8;
637  return AVERROR_INVALIDDATA;
638 }
639 
641  GetByteContext *gb)
642 {
643  if (s->pic_state & PNG_IDAT) {
644  av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
645  return AVERROR_INVALIDDATA;
646  }
647  avctx->sample_aspect_ratio.num = bytestream2_get_be32(gb);
648  avctx->sample_aspect_ratio.den = bytestream2_get_be32(gb);
649  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
650  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
651  bytestream2_skip(gb, 1); /* unit specifier */
652 
653  return 0;
654 }
655 
656 /*
657  * This populates AVCodecContext fields so it must be called before
658  * ff_thread_finish_setup() to avoid a race condition with respect to the
659  * generic copying of avctx fields.
660  */
662 {
663  PNGDecContext *s = avctx->priv_data;
664  int ret;
665 
666  if (s->have_cicp) {
667  if (s->cicp_primaries >= AVCOL_PRI_NB)
668  av_log(avctx, AV_LOG_WARNING, "unrecognized cICP primaries\n");
669  else
670  avctx->color_primaries = frame->color_primaries = s->cicp_primaries;
671  if (s->cicp_trc >= AVCOL_TRC_NB)
672  av_log(avctx, AV_LOG_WARNING, "unrecognized cICP transfer\n");
673  else
674  avctx->color_trc = frame->color_trc = s->cicp_trc;
675  if (s->cicp_range == 0) {
676  av_log(avctx, AV_LOG_WARNING, "tv-range cICP tag found. Colors may be wrong\n");
677  avctx->color_range = frame->color_range = AVCOL_RANGE_MPEG;
678  } else if (s->cicp_range != 1) {
679  /* we already printed a warning when parsing the cICP chunk */
680  avctx->color_range = frame->color_range = AVCOL_RANGE_UNSPECIFIED;
681  }
682  } else if (s->iccp_data) {
683  AVFrameSideData *sd;
685  s->iccp_data_len, &sd);
686  if (ret < 0)
687  return ret;
688  if (sd) {
689  memcpy(sd->data, s->iccp_data, s->iccp_data_len);
690  av_dict_set(&sd->metadata, "name", s->iccp_name, 0);
691  }
692  } else if (s->have_srgb) {
693  avctx->color_primaries = frame->color_primaries = AVCOL_PRI_BT709;
694  avctx->color_trc = frame->color_trc = AVCOL_TRC_IEC61966_2_1;
695  } else if (s->have_chrm) {
697  enum AVColorPrimaries prim;
698  desc.wp.x = av_make_q(s->white_point[0], 100000);
699  desc.wp.y = av_make_q(s->white_point[1], 100000);
700  desc.prim.r.x = av_make_q(s->display_primaries[0][0], 100000);
701  desc.prim.r.y = av_make_q(s->display_primaries[0][1], 100000);
702  desc.prim.g.x = av_make_q(s->display_primaries[1][0], 100000);
703  desc.prim.g.y = av_make_q(s->display_primaries[1][1], 100000);
704  desc.prim.b.x = av_make_q(s->display_primaries[2][0], 100000);
705  desc.prim.b.y = av_make_q(s->display_primaries[2][1], 100000);
707  if (prim != AVCOL_PRI_UNSPECIFIED)
708  avctx->color_primaries = frame->color_primaries = prim;
709  else
710  av_log(avctx, AV_LOG_WARNING, "unknown cHRM primaries\n");
711  }
712 
713  /* these chunks override gAMA */
714  if (s->iccp_data || s->have_srgb || s->have_cicp) {
715  av_dict_set(&s->frame_metadata, "gamma", NULL, 0);
716  } else if (s->gamma) {
717  /*
718  * These values are 100000/2.2, 100000/2.8, 100000/2.6, and
719  * 100000/1.0 respectively. 45455, 35714, and 38462, and 100000.
720  * There's a 0.001 gamma tolerance here in case of floating
721  * point issues when the PNG was written.
722  *
723  * None of the other enums have a pure gamma curve so it makes
724  * sense to leave those to sRGB and cICP.
725  */
726  if (s->gamma > 45355 && s->gamma < 45555)
727  avctx->color_trc = frame->color_trc = AVCOL_TRC_GAMMA22;
728  else if (s->gamma > 35614 && s->gamma < 35814)
729  avctx->color_trc = frame->color_trc = AVCOL_TRC_GAMMA28;
730  else if (s->gamma > 38362 && s->gamma < 38562)
731  avctx->color_trc = frame->color_trc = AVCOL_TRC_SMPTE428;
732  else if (s->gamma > 99900 && s->gamma < 100100)
733  avctx->color_trc = frame->color_trc = AVCOL_TRC_LINEAR;
734  }
735 
736  /* PNG only supports RGB */
737  avctx->colorspace = frame->colorspace = AVCOL_SPC_RGB;
738  if (!s->have_cicp || s->cicp_range == 1)
739  avctx->color_range = frame->color_range = AVCOL_RANGE_JPEG;
740 
741  /*
742  * tRNS sets alpha depth to full, so we ignore sBIT if set.
743  * As a result we must wait until now to set
744  * avctx->bits_per_raw_sample in case tRNS appears after sBIT
745  */
746  if (!s->has_trns && s->significant_bits > 0)
747  avctx->bits_per_raw_sample = s->significant_bits;
748 
749  if (s->have_clli) {
751 
752  ret = ff_decode_content_light_new(avctx, frame, &clli);
753  if (ret < 0)
754  return ret;
755 
756  if (clli) {
757  /*
758  * 0.0001 divisor value
759  * see: https://www.w3.org/TR/png-3/#cLLi-chunk
760  */
761  clli->MaxCLL = s->clli_max / 10000;
762  clli->MaxFALL = s->clli_avg / 10000;
763  }
764  }
765 
766  if (s->have_mdvc) {
768 
769  ret = ff_decode_mastering_display_new(avctx, frame, &mdvc);
770  if (ret < 0)
771  return ret;
772 
773  if (mdvc) {
774  mdvc->has_primaries = 1;
775  for (int i = 0; i < 3; i++) {
776  mdvc->display_primaries[i][0] = av_make_q(s->mdvc_primaries[i][0], 50000);
777  mdvc->display_primaries[i][1] = av_make_q(s->mdvc_primaries[i][1], 50000);
778  }
779  mdvc->white_point[0] = av_make_q(s->mdvc_white_point[0], 50000);
780  mdvc->white_point[1] = av_make_q(s->mdvc_white_point[1], 50000);
781  mdvc->has_luminance = 1;
782  mdvc->max_luminance = av_make_q(s->mdvc_max_lum, 10000);
783  mdvc->min_luminance = av_make_q(s->mdvc_min_lum, 10000);
784  }
785  }
786 
787  return 0;
788 }
789 
791  GetByteContext *gb, AVFrame *p)
792 {
793  int ret;
794  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
795 
796  if (!p)
797  return AVERROR_INVALIDDATA;
798  if (!(s->hdr_state & PNG_IHDR)) {
799  av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
800  return AVERROR_INVALIDDATA;
801  }
802  if (!(s->pic_state & PNG_IDAT)) {
803  /* init image info */
804  ret = ff_set_dimensions(avctx, s->width, s->height);
805  if (ret < 0)
806  return ret;
807 
808  s->channels = ff_png_get_nb_channels(s->color_type);
809  s->bits_per_pixel = s->bit_depth * s->channels;
810  s->bpp = (s->bits_per_pixel + 7) >> 3;
811  s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
812 
813  if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
814  s->color_type == PNG_COLOR_TYPE_RGB) {
815  avctx->pix_fmt = AV_PIX_FMT_RGB24;
816  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
817  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
818  avctx->pix_fmt = AV_PIX_FMT_RGBA;
819  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
820  s->color_type == PNG_COLOR_TYPE_GRAY) {
821  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
822  } else if (s->bit_depth == 16 &&
823  s->color_type == PNG_COLOR_TYPE_GRAY) {
824  avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
825  } else if (s->bit_depth == 16 &&
826  s->color_type == PNG_COLOR_TYPE_RGB) {
827  avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
828  } else if (s->bit_depth == 16 &&
829  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
830  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
831  } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
832  s->color_type == PNG_COLOR_TYPE_PALETTE) {
834  } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
835  avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
836  } else if (s->bit_depth == 8 &&
837  s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
838  avctx->pix_fmt = AV_PIX_FMT_YA8;
839  } else if (s->bit_depth == 16 &&
840  s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
841  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
842  } else {
844  "Bit depth %d color type %d",
845  s->bit_depth, s->color_type);
846  return AVERROR_PATCHWELCOME;
847  }
848 
849  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
850  switch (avctx->pix_fmt) {
851  case AV_PIX_FMT_RGB24:
852  avctx->pix_fmt = AV_PIX_FMT_RGBA;
853  break;
854 
855  case AV_PIX_FMT_RGB48BE:
856  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
857  break;
858 
859  case AV_PIX_FMT_GRAY8:
860  avctx->pix_fmt = AV_PIX_FMT_YA8;
861  break;
862 
863  case AV_PIX_FMT_GRAY16BE:
864  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
865  break;
866 
867  default:
868  avpriv_request_sample(avctx, "bit depth %d "
869  "and color type %d with TRNS",
870  s->bit_depth, s->color_type);
871  return AVERROR_INVALIDDATA;
872  }
873 
874  s->bpp += byte_depth;
875  }
876 
877  ff_progress_frame_unref(&s->picture);
878  if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
879  /* We only need a buffer for the current picture. */
880  ret = ff_thread_get_buffer(avctx, p, 0);
881  if (ret < 0)
882  return ret;
883  } else if (s->dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
884  /* We need a buffer for the current picture as well as
885  * a buffer for the reference to retain. */
886  ret = ff_progress_frame_get_buffer(avctx, &s->picture,
888  if (ret < 0)
889  return ret;
890  ret = ff_thread_get_buffer(avctx, p, 0);
891  if (ret < 0)
892  return ret;
893  } else {
894  /* The picture output this time and the reference to retain coincide. */
895  ret = ff_progress_frame_get_buffer(avctx, &s->picture,
897  if (ret < 0)
898  return ret;
899  ret = av_frame_ref(p, s->picture.f);
900  if (ret < 0)
901  return ret;
902  }
903 
905  p->flags |= AV_FRAME_FLAG_KEY;
906  p->flags |= AV_FRAME_FLAG_INTERLACED * !!s->interlace_type;
907 
908  if ((ret = populate_avctx_color_fields(avctx, p)) < 0)
909  return ret;
910  ff_thread_finish_setup(avctx);
911 
912  /* compute the compressed row size */
913  if (!s->interlace_type) {
914  s->crow_size = s->row_size + 1;
915  } else {
916  s->pass = 0;
917  s->pass_row_size = ff_png_pass_row_size(s->pass,
918  s->bits_per_pixel,
919  s->cur_w);
920  s->crow_size = s->pass_row_size + 1;
921  }
922  ff_dlog(avctx, "row_size=%d crow_size =%d\n",
923  s->row_size, s->crow_size);
924 
925  /* copy the palette if needed */
926  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
927  memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
928  /* empty row is used if differencing to the first row */
929  av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size);
930  if (!s->last_row)
931  return AVERROR_INVALIDDATA;
932  if (s->interlace_type ||
933  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
934  av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size);
935  if (!s->tmp_row)
936  return AVERROR_INVALIDDATA;
937  }
938  /* compressed row */
939  av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
940  if (!s->buffer)
941  return AVERROR(ENOMEM);
942 
943  /* we want crow_buf+1 to be 16-byte aligned */
944  s->crow_buf = s->buffer + 15;
945  s->zstream.zstream.avail_out = s->crow_size;
946  s->zstream.zstream.next_out = s->crow_buf;
947  }
948 
949  s->pic_state |= PNG_IDAT;
950 
951  /* set image to non-transparent bpp while decompressing */
952  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
953  s->bpp -= byte_depth;
954 
955  ret = png_decode_idat(s, gb, p->data[0], p->linesize[0]);
956 
957  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
958  s->bpp += byte_depth;
959 
960  if (ret < 0)
961  return ret;
962 
963  return 0;
964 }
965 
967  GetByteContext *gb)
968 {
969  int length = bytestream2_get_bytes_left(gb);
970  int n, i, r, g, b;
971 
972  if ((length % 3) != 0 || length > 256 * 3)
973  return AVERROR_INVALIDDATA;
974  /* read the palette */
975  n = length / 3;
976  for (i = 0; i < n; i++) {
977  r = bytestream2_get_byte(gb);
978  g = bytestream2_get_byte(gb);
979  b = bytestream2_get_byte(gb);
980  s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
981  }
982  for (; i < 256; i++)
983  s->palette[i] = (0xFFU << 24);
984  s->hdr_state |= PNG_PLTE;
985 
986  return 0;
987 }
988 
990  GetByteContext *gb)
991 {
992  int length = bytestream2_get_bytes_left(gb);
993  int v, i;
994 
995  if (!(s->hdr_state & PNG_IHDR)) {
996  av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
997  return AVERROR_INVALIDDATA;
998  }
999 
1000  if (s->pic_state & PNG_IDAT) {
1001  av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
1002  return AVERROR_INVALIDDATA;
1003  }
1004 
1005  if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1006  if (length > 256 || !(s->hdr_state & PNG_PLTE))
1007  return AVERROR_INVALIDDATA;
1008 
1009  for (i = 0; i < length; i++) {
1010  unsigned v = bytestream2_get_byte(gb);
1011  s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
1012  }
1013  } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
1014  if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
1015  (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
1016  s->bit_depth == 1)
1017  return AVERROR_INVALIDDATA;
1018 
1019  for (i = 0; i < length / 2; i++) {
1020  /* only use the least significant bits */
1021  v = av_mod_uintp2(bytestream2_get_be16(gb), s->bit_depth);
1022 
1023  if (s->bit_depth > 8)
1024  AV_WB16(&s->transparent_color_be[2 * i], v);
1025  else
1026  s->transparent_color_be[i] = v;
1027  }
1028  } else {
1029  return AVERROR_INVALIDDATA;
1030  }
1031 
1032  s->has_trns = 1;
1033 
1034  return 0;
1035 }
1036 
1038 {
1039  int ret, cnt = 0;
1040  AVBPrint bp;
1041 
1042  while ((s->iccp_name[cnt++] = bytestream2_get_byte(gb)) && cnt < 81);
1043  if (cnt > 80) {
1044  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
1046  goto fail;
1047  }
1048 
1049  if (bytestream2_get_byte(gb) != 0) {
1050  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
1052  goto fail;
1053  }
1054 
1055  if ((ret = decode_zbuf(&bp, gb->buffer, gb->buffer_end, s->avctx)) < 0)
1056  return ret;
1057 
1058  av_freep(&s->iccp_data);
1059  ret = av_bprint_finalize(&bp, (char **)&s->iccp_data);
1060  if (ret < 0)
1061  return ret;
1062  s->iccp_data_len = bp.len;
1063 
1064  return 0;
1065 fail:
1066  s->iccp_name[0] = 0;
1067  return ret;
1068 }
1069 
1071  GetByteContext *gb)
1072 {
1073  int bits = 0;
1074  int channels;
1075 
1076  if (!(s->hdr_state & PNG_IHDR)) {
1077  av_log(avctx, AV_LOG_ERROR, "sBIT before IHDR\n");
1078  return AVERROR_INVALIDDATA;
1079  }
1080 
1081  if (s->pic_state & PNG_IDAT) {
1082  av_log(avctx, AV_LOG_ERROR, "sBIT after IDAT\n");
1083  return AVERROR_INVALIDDATA;
1084  }
1085 
1086  channels = ff_png_get_nb_channels(s->color_type);
1087 
1089  return AVERROR_INVALIDDATA;
1090 
1091  for (int i = 0; i < channels; i++) {
1092  int b = bytestream2_get_byteu(gb);
1093  bits = FFMAX(b, bits);
1094  }
1095 
1096  if (bits < 0 || bits > s->bit_depth) {
1097  av_log(avctx, AV_LOG_ERROR, "Invalid significant bits: %d\n", bits);
1098  return AVERROR_INVALIDDATA;
1099  }
1100  s->significant_bits = bits;
1101 
1102  return 0;
1103 }
1104 
1106 {
1107  if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
1108  int i, j, k;
1109  uint8_t *pd = p->data[0];
1110  for (j = 0; j < s->height; j++) {
1111  i = s->width / 8;
1112  for (k = 7; k >= 1; k--)
1113  if ((s->width&7) >= k)
1114  pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
1115  for (i--; i >= 0; i--) {
1116  pd[8*i + 7]= pd[i] & 1;
1117  pd[8*i + 6]= (pd[i]>>1) & 1;
1118  pd[8*i + 5]= (pd[i]>>2) & 1;
1119  pd[8*i + 4]= (pd[i]>>3) & 1;
1120  pd[8*i + 3]= (pd[i]>>4) & 1;
1121  pd[8*i + 2]= (pd[i]>>5) & 1;
1122  pd[8*i + 1]= (pd[i]>>6) & 1;
1123  pd[8*i + 0]= pd[i]>>7;
1124  }
1125  pd += p->linesize[0];
1126  }
1127  } else if (s->bits_per_pixel == 2) {
1128  int i, j;
1129  uint8_t *pd = p->data[0];
1130  for (j = 0; j < s->height; j++) {
1131  i = s->width / 4;
1132  if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1133  if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
1134  if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
1135  if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
1136  for (i--; i >= 0; i--) {
1137  pd[4*i + 3]= pd[i] & 3;
1138  pd[4*i + 2]= (pd[i]>>2) & 3;
1139  pd[4*i + 1]= (pd[i]>>4) & 3;
1140  pd[4*i + 0]= pd[i]>>6;
1141  }
1142  } else {
1143  if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
1144  if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
1145  if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
1146  for (i--; i >= 0; i--) {
1147  pd[4*i + 3]= ( pd[i] & 3)*0x55;
1148  pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
1149  pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
1150  pd[4*i + 0]= ( pd[i]>>6 )*0x55;
1151  }
1152  }
1153  pd += p->linesize[0];
1154  }
1155  } else if (s->bits_per_pixel == 4) {
1156  int i, j;
1157  uint8_t *pd = p->data[0];
1158  for (j = 0; j < s->height; j++) {
1159  i = s->width/2;
1160  if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1161  if (s->width&1) pd[2*i+0]= pd[i]>>4;
1162  for (i--; i >= 0; i--) {
1163  pd[2*i + 1] = pd[i] & 15;
1164  pd[2*i + 0] = pd[i] >> 4;
1165  }
1166  } else {
1167  if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
1168  for (i--; i >= 0; i--) {
1169  pd[2*i + 1] = (pd[i] & 15) * 0x11;
1170  pd[2*i + 0] = (pd[i] >> 4) * 0x11;
1171  }
1172  }
1173  pd += p->linesize[0];
1174  }
1175  }
1176 }
1177 
1179  GetByteContext *gb)
1180 {
1181  uint32_t sequence_number;
1182  int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
1183 
1185  return AVERROR_INVALIDDATA;
1186 
1187  if (!(s->hdr_state & PNG_IHDR)) {
1188  av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
1189  return AVERROR_INVALIDDATA;
1190  }
1191 
1192  if (s->pic_state & PNG_IDAT) {
1193  av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
1194  return AVERROR_INVALIDDATA;
1195  }
1196 
1197  sequence_number = bytestream2_get_be32(gb);
1198  cur_w = bytestream2_get_be32(gb);
1199  cur_h = bytestream2_get_be32(gb);
1200  x_offset = bytestream2_get_be32(gb);
1201  y_offset = bytestream2_get_be32(gb);
1202  bytestream2_skip(gb, 4); /* delay_num (2), delay_den (2) */
1203  dispose_op = bytestream2_get_byte(gb);
1204  blend_op = bytestream2_get_byte(gb);
1205 
1206  if (sequence_number == 0 &&
1207  (cur_w != s->width ||
1208  cur_h != s->height ||
1209  x_offset != 0 ||
1210  y_offset != 0) ||
1211  cur_w <= 0 || cur_h <= 0 ||
1212  x_offset < 0 || y_offset < 0 ||
1213  cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1214  return AVERROR_INVALIDDATA;
1215 
1216  if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1217  av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1218  return AVERROR_INVALIDDATA;
1219  }
1220 
1221  if ((sequence_number == 0 || !s->last_picture.f) &&
1222  dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1223  // No previous frame to revert to for the first frame
1224  // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1225  dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1226  }
1227 
1228  if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1229  avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1230  avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1231  avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1232  avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1233  avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1234  )) {
1235  // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1236  blend_op = APNG_BLEND_OP_SOURCE;
1237  }
1238 
1239  s->cur_w = cur_w;
1240  s->cur_h = cur_h;
1241  s->x_offset = x_offset;
1242  s->y_offset = y_offset;
1243  s->dispose_op = dispose_op;
1244  s->blend_op = blend_op;
1245 
1246  return 0;
1247 }
1248 
1250 {
1251  int i, j;
1252  uint8_t *pd = p->data[0];
1253  uint8_t *pd_last = s->last_picture.f->data[0];
1254  int ls = av_image_get_linesize(p->format, s->width, 0);
1255 
1256  ls = FFMIN(ls, s->width * s->bpp);
1257 
1258  ff_progress_frame_await(&s->last_picture, INT_MAX);
1259  for (j = 0; j < s->height; j++) {
1260  for (i = 0; i < ls; i++)
1261  pd[i] += pd_last[i];
1262  pd += p->linesize[0];
1263  pd_last += s->last_picture.f->linesize[0];
1264  }
1265 }
1266 
1267 // divide by 255 and round to nearest
1268 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1269 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1270 
1272  AVFrame *p)
1273 {
1274  uint8_t *dst = p->data[0];
1275  ptrdiff_t dst_stride = p->linesize[0];
1276  const uint8_t *src = s->last_picture.f->data[0];
1277  ptrdiff_t src_stride = s->last_picture.f->linesize[0];
1278  const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1279 
1280  size_t x, y;
1281 
1282  if (s->blend_op == APNG_BLEND_OP_OVER &&
1283  avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1284  avctx->pix_fmt != AV_PIX_FMT_GRAY8A) {
1285  avpriv_request_sample(avctx, "Blending with pixel format %s",
1286  av_get_pix_fmt_name(avctx->pix_fmt));
1287  return AVERROR_PATCHWELCOME;
1288  }
1289 
1290  ff_progress_frame_await(&s->last_picture, INT_MAX);
1291 
1292  // copy unchanged rectangles from the last frame
1293  for (y = 0; y < s->y_offset; y++)
1294  memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1295  for (y = s->y_offset; y < s->y_offset + s->cur_h; y++) {
1296  memcpy(dst + y * dst_stride, src + y * src_stride, s->x_offset * bpp);
1297  memcpy(dst + y * dst_stride + (s->x_offset + s->cur_w) * bpp,
1298  src + y * src_stride + (s->x_offset + s->cur_w) * bpp,
1299  (p->width - s->cur_w - s->x_offset) * bpp);
1300  }
1301  for (y = s->y_offset + s->cur_h; y < p->height; y++)
1302  memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1303 
1304  if (s->blend_op == APNG_BLEND_OP_OVER) {
1305  // Perform blending
1306  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1307  uint8_t *foreground = dst + dst_stride * y + bpp * s->x_offset;
1308  const uint8_t *background = src + src_stride * y + bpp * s->x_offset;
1309  for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += bpp, background += bpp) {
1310  size_t b;
1311  uint8_t foreground_alpha, background_alpha, output_alpha;
1312  uint8_t output[10];
1313 
1314  // Since we might be blending alpha onto alpha, we use the following equations:
1315  // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1316  // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1317 
1318  switch (avctx->pix_fmt) {
1319  case AV_PIX_FMT_RGBA:
1320  foreground_alpha = foreground[3];
1321  background_alpha = background[3];
1322  break;
1323 
1324  case AV_PIX_FMT_GRAY8A:
1325  foreground_alpha = foreground[1];
1326  background_alpha = background[1];
1327  break;
1328  }
1329 
1330  if (foreground_alpha == 255)
1331  continue;
1332 
1333  if (foreground_alpha == 0) {
1334  memcpy(foreground, background, bpp);
1335  continue;
1336  }
1337 
1338  output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1339 
1340  av_assert0(bpp <= 10);
1341 
1342  for (b = 0; b < bpp - 1; ++b) {
1343  if (output_alpha == 0) {
1344  output[b] = 0;
1345  } else if (background_alpha == 255) {
1346  output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1347  } else {
1348  output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1349  }
1350  }
1351  output[b] = output_alpha;
1352  memcpy(foreground, output, bpp);
1353  }
1354  }
1355  }
1356 
1357  return 0;
1358 }
1359 
1361 {
1362  // need to reset a rectangle to black
1363  av_unused int ret = av_frame_copy(s->picture.f, p);
1364  const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1365  const ptrdiff_t dst_stride = s->picture.f->linesize[0];
1366  uint8_t *dst = s->picture.f->data[0] + s->y_offset * dst_stride + bpp * s->x_offset;
1367 
1368  av_assert1(ret >= 0);
1369 
1370  for (size_t y = 0; y < s->cur_h; y++) {
1371  memset(dst, 0, bpp * s->cur_w);
1372  dst += dst_stride;
1373  }
1374 }
1375 
1377  AVFrame *p, const AVPacket *avpkt)
1378 {
1379  const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1380  uint32_t tag, length;
1381  int decode_next_dat = 0;
1382  int i, ret;
1383 
1384  for (;;) {
1385  GetByteContext gb_chunk;
1386 
1387  length = bytestream2_get_bytes_left(&s->gb);
1388  if (length <= 0) {
1389 
1390  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1391  avctx->skip_frame == AVDISCARD_ALL) {
1392  return 0;
1393  }
1394 
1395  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1396  if (!(s->pic_state & PNG_IDAT))
1397  return 0;
1398  else
1399  goto exit_loop;
1400  }
1401  av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1402  if ( s->pic_state & PNG_ALLIMAGE
1404  goto exit_loop;
1406  goto fail;
1407  }
1408 
1409  length = bytestream2_get_be32(&s->gb);
1410  if (length > 0x7fffffff || length + 8 > bytestream2_get_bytes_left(&s->gb)) {
1411  av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1413  goto fail;
1414  }
1415  if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1416  uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1417  uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1418  if (crc_sig ^ crc_cal) {
1419  av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1420  if (avctx->err_recognition & AV_EF_EXPLODE) {
1421  av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1423  goto fail;
1424  }
1425  av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1426  bytestream2_skip(&s->gb, length + 8); /* tag */
1427  continue;
1428  }
1429  }
1430  tag = bytestream2_get_le32(&s->gb);
1431  if (avctx->debug & FF_DEBUG_STARTCODE)
1432  av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1433  av_fourcc2str(tag), length);
1434 
1435  bytestream2_init(&gb_chunk, s->gb.buffer, length);
1436  bytestream2_skip(&s->gb, length + 4);
1437 
1438  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1439  avctx->skip_frame == AVDISCARD_ALL) {
1440  switch(tag) {
1441  case MKTAG('I', 'H', 'D', 'R'):
1442  case MKTAG('p', 'H', 'Y', 's'):
1443  case MKTAG('t', 'E', 'X', 't'):
1444  case MKTAG('I', 'D', 'A', 'T'):
1445  case MKTAG('t', 'R', 'N', 'S'):
1446  case MKTAG('s', 'R', 'G', 'B'):
1447  case MKTAG('c', 'I', 'C', 'P'):
1448  case MKTAG('c', 'H', 'R', 'M'):
1449  case MKTAG('g', 'A', 'M', 'A'):
1450  break;
1451  default:
1452  continue;
1453  }
1454  }
1455 
1456  switch (tag) {
1457  case MKTAG('I', 'H', 'D', 'R'):
1458  if ((ret = decode_ihdr_chunk(avctx, s, &gb_chunk)) < 0)
1459  goto fail;
1460  break;
1461  case MKTAG('p', 'H', 'Y', 's'):
1462  if ((ret = decode_phys_chunk(avctx, s, &gb_chunk)) < 0)
1463  goto fail;
1464  break;
1465  case MKTAG('f', 'c', 'T', 'L'):
1466  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1467  continue;
1468  if ((ret = decode_fctl_chunk(avctx, s, &gb_chunk)) < 0)
1469  goto fail;
1470  decode_next_dat = 1;
1471  break;
1472  case MKTAG('f', 'd', 'A', 'T'):
1473  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1474  continue;
1475  if (!decode_next_dat || bytestream2_get_bytes_left(&gb_chunk) < 4) {
1477  goto fail;
1478  }
1479  bytestream2_get_be32(&gb_chunk);
1480  /* fallthrough */
1481  case MKTAG('I', 'D', 'A', 'T'):
1482  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1483  continue;
1484  if ((ret = decode_idat_chunk(avctx, s, &gb_chunk, p)) < 0)
1485  goto fail;
1486  break;
1487  case MKTAG('P', 'L', 'T', 'E'):
1488  decode_plte_chunk(avctx, s, &gb_chunk);
1489  break;
1490  case MKTAG('t', 'R', 'N', 'S'):
1491  decode_trns_chunk(avctx, s, &gb_chunk);
1492  break;
1493  case MKTAG('t', 'E', 'X', 't'):
1494  if (decode_text_chunk(s, &gb_chunk, 0) < 0)
1495  av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1496  break;
1497  case MKTAG('z', 'T', 'X', 't'):
1498  if (decode_text_chunk(s, &gb_chunk, 1) < 0)
1499  av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1500  break;
1501  case MKTAG('s', 'T', 'E', 'R'): {
1502  int mode = bytestream2_get_byte(&gb_chunk);
1503 
1504  if (mode == 0 || mode == 1) {
1505  s->stereo_mode = mode;
1506  } else {
1507  av_log(avctx, AV_LOG_WARNING,
1508  "Unknown value in sTER chunk (%d)\n", mode);
1509  }
1510  break;
1511  }
1512  case MKTAG('c', 'I', 'C', 'P'):
1513  s->cicp_primaries = bytestream2_get_byte(&gb_chunk);
1514  s->cicp_trc = bytestream2_get_byte(&gb_chunk);
1515  if (bytestream2_get_byte(&gb_chunk) != 0)
1516  av_log(avctx, AV_LOG_WARNING, "nonzero cICP matrix\n");
1517  s->cicp_range = bytestream2_get_byte(&gb_chunk);
1518  if (s->cicp_range != 0 && s->cicp_range != 1)
1519  av_log(avctx, AV_LOG_WARNING, "invalid cICP range: %d\n", s->cicp_range);
1520  s->have_cicp = 1;
1521  break;
1522  case MKTAG('s', 'R', 'G', 'B'):
1523  /* skip rendering intent byte */
1524  bytestream2_skip(&gb_chunk, 1);
1525  s->have_srgb = 1;
1526  break;
1527  case MKTAG('i', 'C', 'C', 'P'): {
1528  if ((ret = decode_iccp_chunk(s, &gb_chunk)) < 0)
1529  goto fail;
1530  break;
1531  }
1532  case MKTAG('c', 'H', 'R', 'M'): {
1533  s->have_chrm = 1;
1534 
1535  s->white_point[0] = bytestream2_get_be32(&gb_chunk);
1536  s->white_point[1] = bytestream2_get_be32(&gb_chunk);
1537 
1538  /* RGB Primaries */
1539  for (i = 0; i < 3; i++) {
1540  s->display_primaries[i][0] = bytestream2_get_be32(&gb_chunk);
1541  s->display_primaries[i][1] = bytestream2_get_be32(&gb_chunk);
1542  }
1543 
1544  break;
1545  }
1546  case MKTAG('s', 'B', 'I', 'T'):
1547  if ((ret = decode_sbit_chunk(avctx, s, &gb_chunk)) < 0)
1548  goto fail;
1549  break;
1550  case MKTAG('g', 'A', 'M', 'A'): {
1551  AVBPrint bp;
1552  char *gamma_str;
1553  s->gamma = bytestream2_get_be32(&gb_chunk);
1554 
1556  av_bprintf(&bp, "%i/%i", s->gamma, 100000);
1557  ret = av_bprint_finalize(&bp, &gamma_str);
1558  if (ret < 0)
1559  return ret;
1560 
1561  av_dict_set(&s->frame_metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1562 
1563  break;
1564  }
1565  case MKTAG('c', 'L', 'L', 'i'):
1566  if (bytestream2_get_bytes_left(&gb_chunk) != 8) {
1567  av_log(avctx, AV_LOG_WARNING, "Invalid cLLi chunk size: %d\n", bytestream2_get_bytes_left(&gb_chunk));
1568  break;
1569  }
1570  s->have_clli = 1;
1571  s->clli_max = bytestream2_get_be32u(&gb_chunk);
1572  s->clli_avg = bytestream2_get_be32u(&gb_chunk);
1573  break;
1574  case MKTAG('m', 'D', 'V', 'c'):
1575  if (bytestream2_get_bytes_left(&gb_chunk) != 24) {
1576  av_log(avctx, AV_LOG_WARNING, "Invalid mDVc chunk size: %d\n", bytestream2_get_bytes_left(&gb_chunk));
1577  break;
1578  }
1579  s->have_mdvc = 1;
1580  for (int i = 0; i < 3; i++) {
1581  s->mdvc_primaries[i][0] = bytestream2_get_be16u(&gb_chunk);
1582  s->mdvc_primaries[i][1] = bytestream2_get_be16u(&gb_chunk);
1583  }
1584  s->mdvc_white_point[0] = bytestream2_get_be16u(&gb_chunk);
1585  s->mdvc_white_point[1] = bytestream2_get_be16u(&gb_chunk);
1586  s->mdvc_max_lum = bytestream2_get_be32u(&gb_chunk);
1587  s->mdvc_min_lum = bytestream2_get_be32u(&gb_chunk);
1588  break;
1589  case MKTAG('I', 'E', 'N', 'D'):
1590  if (!(s->pic_state & PNG_ALLIMAGE))
1591  av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1592  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1594  goto fail;
1595  }
1596  goto exit_loop;
1597  }
1598  }
1599 exit_loop:
1600 
1601  if (!p)
1602  return AVERROR_INVALIDDATA;
1603 
1604  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1605  avctx->skip_frame == AVDISCARD_ALL) {
1606  return 0;
1607  }
1608 
1611  goto fail;
1612  }
1613 
1614  if (s->bits_per_pixel <= 4)
1615  handle_small_bpp(s, p);
1616 
1617  if (s->color_type == PNG_COLOR_TYPE_PALETTE && avctx->codec_id == AV_CODEC_ID_APNG) {
1618  for (int y = 0; y < s->height; y++) {
1619  uint8_t *row = &p->data[0][p->linesize[0] * y];
1620 
1621  for (int x = s->width - 1; x >= 0; x--) {
1622  const uint8_t idx = row[x];
1623 
1624  row[4*x+2] = s->palette[idx] & 0xFF;
1625  row[4*x+1] = (s->palette[idx] >> 8 ) & 0xFF;
1626  row[4*x+0] = (s->palette[idx] >> 16) & 0xFF;
1627  row[4*x+3] = s->palette[idx] >> 24;
1628  }
1629  }
1630  }
1631 
1632  /* apply transparency if needed */
1633  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1634  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1635  size_t raw_bpp = s->bpp - byte_depth;
1636  ptrdiff_t x, y;
1637 
1638  av_assert0(s->bit_depth > 1);
1639 
1640  for (y = 0; y < s->height; ++y) {
1641  uint8_t *row = &p->data[0][p->linesize[0] * y];
1642 
1643  if (s->bpp == 2 && byte_depth == 1) {
1644  uint8_t *pixel = &row[2 * s->width - 1];
1645  uint8_t *rowp = &row[1 * s->width - 1];
1646  int tcolor = s->transparent_color_be[0];
1647  for (x = s->width; x > 0; --x) {
1648  *pixel-- = *rowp == tcolor ? 0 : 0xff;
1649  *pixel-- = *rowp--;
1650  }
1651  } else if (s->bpp == 4 && byte_depth == 1) {
1652  uint8_t *pixel = &row[4 * s->width - 1];
1653  uint8_t *rowp = &row[3 * s->width - 1];
1654  int tcolor = AV_RL24(s->transparent_color_be);
1655  for (x = s->width; x > 0; --x) {
1656  *pixel-- = AV_RL24(rowp-2) == tcolor ? 0 : 0xff;
1657  *pixel-- = *rowp--;
1658  *pixel-- = *rowp--;
1659  *pixel-- = *rowp--;
1660  }
1661  } else {
1662  /* since we're updating in-place, we have to go from right to left */
1663  for (x = s->width; x > 0; --x) {
1664  uint8_t *pixel = &row[s->bpp * (x - 1)];
1665  memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1666 
1667  if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1668  memset(&pixel[raw_bpp], 0, byte_depth);
1669  } else {
1670  memset(&pixel[raw_bpp], 0xff, byte_depth);
1671  }
1672  }
1673  }
1674  }
1675  }
1676 
1677  /* handle P-frames only if a predecessor frame is available */
1678  if (s->last_picture.f) {
1679  if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1680  && s->last_picture.f->width == p->width
1681  && s->last_picture.f->height== p->height
1682  && s->last_picture.f->format== p->format
1683  ) {
1684  if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1685  handle_p_frame_png(s, p);
1686  else if (CONFIG_APNG_DECODER &&
1687  avctx->codec_id == AV_CODEC_ID_APNG &&
1688  (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1689  goto fail;
1690  }
1691  }
1692  if (CONFIG_APNG_DECODER && s->dispose_op == APNG_DISPOSE_OP_BACKGROUND)
1694 
1695  ret = 0;
1696 fail:
1697  if (s->picture.f)
1698  ff_progress_frame_report(&s->picture, INT_MAX);
1699 
1700  return ret;
1701 }
1702 
1704 {
1705  av_freep(&s->iccp_data);
1706  s->iccp_data_len = 0;
1707  s->iccp_name[0] = 0;
1708 
1709  s->stereo_mode = -1;
1710 
1711  s->have_chrm = 0;
1712  s->have_srgb = 0;
1713  s->have_cicp = 0;
1714 
1715  av_dict_free(&s->frame_metadata);
1716 }
1717 
1719 {
1720  int ret;
1721 
1722  if (s->stereo_mode >= 0) {
1724  if (!stereo3d) {
1725  ret = AVERROR(ENOMEM);
1726  goto fail;
1727  }
1728 
1729  stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1730  stereo3d->flags = s->stereo_mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1731  }
1732 
1733  FFSWAP(AVDictionary*, f->metadata, s->frame_metadata);
1734 
1735  return 0;
1736 fail:
1737  av_frame_unref(f);
1738  return ret;
1739 }
1740 
1741 #if CONFIG_PNG_DECODER
1742 static int decode_frame_png(AVCodecContext *avctx, AVFrame *p,
1743  int *got_frame, AVPacket *avpkt)
1744 {
1745  PNGDecContext *const s = avctx->priv_data;
1746  const uint8_t *buf = avpkt->data;
1747  int buf_size = avpkt->size;
1748  int64_t sig;
1749  int ret;
1750 
1752 
1753  bytestream2_init(&s->gb, buf, buf_size);
1754 
1755  /* check signature */
1756  sig = bytestream2_get_be64(&s->gb);
1757  if (sig != PNGSIG &&
1758  sig != MNGSIG) {
1759  av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1760  return AVERROR_INVALIDDATA;
1761  }
1762 
1763  s->y = s->has_trns = 0;
1764  s->hdr_state = 0;
1765  s->pic_state = 0;
1766 
1767  /* Reset z_stream */
1768  ret = inflateReset(&s->zstream.zstream);
1769  if (ret != Z_OK)
1770  return AVERROR_EXTERNAL;
1771 
1772  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1773  goto the_end;
1774 
1775  if (avctx->skip_frame == AVDISCARD_ALL) {
1776  *got_frame = 0;
1777  ret = bytestream2_tell(&s->gb);
1778  goto the_end;
1779  }
1780 
1781  ret = output_frame(s, p);
1782  if (ret < 0)
1783  goto the_end;
1784 
1785  if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1786  ff_progress_frame_unref(&s->last_picture);
1787  FFSWAP(ProgressFrame, s->picture, s->last_picture);
1788  }
1789 
1790  *got_frame = 1;
1791 
1792  ret = bytestream2_tell(&s->gb);
1793 the_end:
1794  s->crow_buf = NULL;
1795  return ret;
1796 }
1797 #endif
1798 
1799 #if CONFIG_APNG_DECODER
1800 static int decode_frame_apng(AVCodecContext *avctx, AVFrame *p,
1801  int *got_frame, AVPacket *avpkt)
1802 {
1803  PNGDecContext *const s = avctx->priv_data;
1804  int ret;
1805 
1807 
1808  if (!(s->hdr_state & PNG_IHDR)) {
1809  if (!avctx->extradata_size)
1810  return AVERROR_INVALIDDATA;
1811 
1812  if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1813  return AVERROR_EXTERNAL;
1814  bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1815  if ((ret = decode_frame_common(avctx, s, NULL, avpkt)) < 0)
1816  return ret;
1817  }
1818 
1819  /* reset state for a new frame */
1820  if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1821  return AVERROR_EXTERNAL;
1822  s->y = 0;
1823  s->pic_state = 0;
1824  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1825  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1826  return ret;
1827 
1828  if (!(s->pic_state & PNG_ALLIMAGE))
1829  av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1830  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT)))
1831  return AVERROR_INVALIDDATA;
1832 
1833  ret = output_frame(s, p);
1834  if (ret < 0)
1835  return ret;
1836 
1837  if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1838  if (s->dispose_op != APNG_DISPOSE_OP_PREVIOUS)
1839  FFSWAP(ProgressFrame, s->picture, s->last_picture);
1840  ff_progress_frame_unref(&s->picture);
1841  }
1842 
1843  *got_frame = 1;
1844  return bytestream2_tell(&s->gb);
1845 }
1846 #endif
1847 
1848 #if HAVE_THREADS
1849 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1850 {
1851  PNGDecContext *psrc = src->priv_data;
1852  PNGDecContext *pdst = dst->priv_data;
1853  const ProgressFrame *src_frame;
1854 
1855  if (dst == src)
1856  return 0;
1857 
1858  if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1859 
1860  pdst->width = psrc->width;
1861  pdst->height = psrc->height;
1862  pdst->bit_depth = psrc->bit_depth;
1863  pdst->color_type = psrc->color_type;
1864  pdst->compression_type = psrc->compression_type;
1865  pdst->interlace_type = psrc->interlace_type;
1866  pdst->filter_type = psrc->filter_type;
1867  pdst->has_trns = psrc->has_trns;
1868  memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1869 
1870  memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1871 
1872  pdst->hdr_state |= psrc->hdr_state;
1873  }
1874 
1875  src_frame = psrc->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
1876  &psrc->last_picture : &psrc->picture;
1877 
1878  ff_progress_frame_replace(&pdst->last_picture, src_frame);
1879 
1880  return 0;
1881 }
1882 #endif
1883 
1885 {
1886  PNGDecContext *s = avctx->priv_data;
1887 
1888  s->avctx = avctx;
1889 
1890  ff_pngdsp_init(&s->dsp);
1891 
1892  return ff_inflate_init(&s->zstream, avctx);
1893 }
1894 
1896 {
1897  PNGDecContext *s = avctx->priv_data;
1898 
1899  ff_progress_frame_unref(&s->last_picture);
1900  ff_progress_frame_unref(&s->picture);
1901  av_freep(&s->buffer);
1902  s->buffer_size = 0;
1903  av_freep(&s->last_row);
1904  s->last_row_size = 0;
1905  av_freep(&s->tmp_row);
1906  s->tmp_row_size = 0;
1907 
1908  av_freep(&s->iccp_data);
1909  av_dict_free(&s->frame_metadata);
1910  ff_inflate_end(&s->zstream);
1911 
1912  return 0;
1913 }
1914 
1915 #if CONFIG_APNG_DECODER
1916 const FFCodec ff_apng_decoder = {
1917  .p.name = "apng",
1918  CODEC_LONG_NAME("APNG (Animated Portable Network Graphics) image"),
1919  .p.type = AVMEDIA_TYPE_VIDEO,
1920  .p.id = AV_CODEC_ID_APNG,
1921  .priv_data_size = sizeof(PNGDecContext),
1922  .init = png_dec_init,
1923  .close = png_dec_end,
1924  FF_CODEC_DECODE_CB(decode_frame_apng),
1926  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
1927  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
1930 };
1931 #endif
1932 
1933 #if CONFIG_PNG_DECODER
1934 const FFCodec ff_png_decoder = {
1935  .p.name = "png",
1936  CODEC_LONG_NAME("PNG (Portable Network Graphics) image"),
1937  .p.type = AVMEDIA_TYPE_VIDEO,
1938  .p.id = AV_CODEC_ID_PNG,
1939  .priv_data_size = sizeof(PNGDecContext),
1940  .init = png_dec_init,
1941  .close = png_dec_end,
1942  FF_CODEC_DECODE_CB(decode_frame_png),
1944  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
1945  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
1949 };
1950 #endif
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:32
PNG_PLTE
@ PNG_PLTE
Definition: pngdec.c:53
PNGDSPContext
Definition: pngdsp.h:27
AVMasteringDisplayMetadata::has_primaries
int has_primaries
Flag indicating whether the display primaries (and white point) are set.
Definition: mastering_display_metadata.h:62
ff_progress_frame_report
void ff_progress_frame_report(ProgressFrame *f, int n)
Notify later decoding threads when part of their reference frame is ready.
Definition: decode.c:1759
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
AVMasteringDisplayMetadata::max_luminance
AVRational max_luminance
Max luminance of mastering display (cd/m^2).
Definition: mastering_display_metadata.h:57
PNGDecContext::clli_max
uint32_t clli_max
Definition: pngdec.c:87
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: defs.h:51
clear_frame_metadata
static void clear_frame_metadata(PNGDecContext *s)
Definition: pngdec.c:1703
ff_add_png_paeth_prediction
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdec.c:217
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
PNGDecContext::have_srgb
int have_srgb
Definition: pngdec.c:81
PNGDecContext::cicp_range
enum AVColorRange cicp_range
Definition: pngdec.c:85
r
const char * r
Definition: vf_curves.c:127
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AV_PIX_FMT_YA8
@ AV_PIX_FMT_YA8
8 bits gray, 8 bits alpha
Definition: pixfmt.h:140
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:685
AVColorTransferCharacteristic
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:580
out
FILE * out
Definition: movenc.c:55
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
GetByteContext
Definition: bytestream.h:33
PNG_ALLIMAGE
@ PNG_ALLIMAGE
Definition: pngdec.c:58
AVColorPrimariesDesc
Struct that contains both white point location and primaries location, providing the complete descrip...
Definition: csp.h:78
AVCRC
uint32_t AVCRC
Definition: crc.h:46
PNGDecContext::last_row_size
unsigned int last_row_size
Definition: pngdec.c:116
APNG_FCTL_CHUNK_SIZE
#define APNG_FCTL_CHUNK_SIZE
Definition: apng.h:42
decode_phys_chunk
static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:640
AVCOL_TRC_LINEAR
@ AVCOL_TRC_LINEAR
"Linear transfer characteristics"
Definition: pixfmt.h:589
PNGDecContext::bit_depth
int bit_depth
Definition: pngdec.c:101
ff_png_get_nb_channels
int ff_png_get_nb_channels(int color_type)
Definition: png.c:41
AVMasteringDisplayMetadata::display_primaries
AVRational display_primaries[3][2]
CIE 1931 xy chromaticity coords of color primaries (r, g, b order).
Definition: mastering_display_metadata.h:42
PNGDSPContext::add_paeth_prediction
void(* add_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdsp.h:33
AVMasteringDisplayMetadata::has_luminance
int has_luminance
Flag indicating whether the luminance (min_ and max_) have been set.
Definition: mastering_display_metadata.h:67
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1420
rational.h
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
PNGDecContext::crow_size
int crow_size
Definition: pngdec.c:122
av_unused
#define av_unused
Definition: attributes.h:131
av_mod_uintp2
#define av_mod_uintp2
Definition: common.h:126
decode_text_chunk
static int decode_text_chunk(PNGDecContext *s, GetByteContext *gb, int compressed)
Definition: pngdec.c:542
AVContentLightMetadata::MaxCLL
unsigned MaxCLL
Max content light level (cd/m^2).
Definition: mastering_display_metadata.h:111
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVCOL_TRC_NB
@ AVCOL_TRC_NB
Not part of ABI.
Definition: pixfmt.h:602
AV_PIX_FMT_RGBA64BE
@ AV_PIX_FMT_RGBA64BE
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:202
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:678
AVFrame::width
int width
Definition: frame.h:446
w
uint8_t w
Definition: llviddspenc.c:38
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:686
AVPacket::data
uint8_t * data
Definition: packet.h:524
PNGDecContext::have_clli
int have_clli
Definition: pngdec.c:86
b
#define b
Definition: input.c:41
ff_progress_frame_get_buffer
int ff_progress_frame_get_buffer(AVCodecContext *avctx, ProgressFrame *f, int flags)
This function sets up the ProgressFrame, i.e.
Definition: decode.c:1717
data
const char data[16]
Definition: mxf.c:148
PNGDecContext::mdvc_max_lum
uint32_t mdvc_max_lum
Definition: pngdec.c:92
FFCodec
Definition: codec_internal.h:126
PNGDecContext::row_size
int row_size
Definition: pngdec.c:123
FFZStream::zstream
z_stream zstream
Definition: zlib_wrapper.h:28
AVCOL_SPC_RGB
@ AVCOL_SPC_RGB
order of coefficients is actually GBR, also IEC 61966-2-1 (sRGB), YZX and ST 428-1
Definition: pixfmt.h:610
APNG_BLEND_OP_OVER
@ APNG_BLEND_OP_OVER
Definition: apng.h:38
PNGDecContext::width
int width
Definition: pngdec.c:97
AVDictionary
Definition: dict.c:34
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:646
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVColorPrimaries
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:555
PNGDecContext::picture
ProgressFrame picture
Definition: pngdec.c:67
AV_CODEC_ID_APNG
@ AV_CODEC_ID_APNG
Definition: codec_id.h:265
PNGDecContext::tmp_row_size
unsigned int tmp_row_size
Definition: pngdec.c:118
PNGDecContext::color_type
int color_type
Definition: pngdec.c:102
PNGDecContext::cur_h
int cur_h
Definition: pngdec.c:98
ff_set_dimensions
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:94
PNGDecContext::bits_per_pixel
int bits_per_pixel
Definition: pngdec.c:107
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:579
thread.h
PNGDecContext::gamma
int gamma
Definition: pngdec.c:80
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1397
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
NB_PASSES
#define NB_PASSES
Definition: png.h:47
PNGDecContext::blend_op
uint8_t blend_op
Definition: pngdec.c:100
AVContentLightMetadata
Content light level needed by to transmit HDR over HDMI (CTA-861.3).
Definition: mastering_display_metadata.h:107
crc.h
AV_PIX_FMT_GRAY16BE
@ AV_PIX_FMT_GRAY16BE
Y , 16bpp, big-endian.
Definition: pixfmt.h:104
AV_STEREO3D_SIDEBYSIDE
@ AV_STEREO3D_SIDEBYSIDE
Views are next to each other.
Definition: stereo3d.h:64
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
FAST_DIV255
#define FAST_DIV255(x)
Definition: pngdec.c:1269
PNGImageState
PNGImageState
Definition: pngdec.c:56
PNG_FILTER_TYPE_LOCO
#define PNG_FILTER_TYPE_LOCO
Definition: png.h:39
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
PNGDecContext::have_mdvc
int have_mdvc
Definition: pngdec.c:89
AVCOL_TRC_IEC61966_2_1
@ AVCOL_TRC_IEC61966_2_1
IEC 61966-2-1 (sRGB or sYCC)
Definition: pixfmt.h:594
PNGDecContext::pass_row_size
int pass_row_size
Definition: pngdec.c:124
ff_png_pass_row_size
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
Definition: png.c:54
AVCodecContext::skip_frame
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1820
fail
#define fail()
Definition: checkasm.h:183
inflate
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:194
png_dec_end
static av_cold int png_dec_end(AVCodecContext *avctx)
Definition: pngdec.c:1895
OP_AVG
#define OP_AVG(x, s, l)
AVCOL_TRC_GAMMA28
@ AVCOL_TRC_GAMMA28
also ITU-R BT470BG
Definition: pixfmt.h:586
PNGDecContext::pic_state
enum PNGImageState pic_state
Definition: pngdec.c:96
decode_idat_chunk
static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb, AVFrame *p)
Definition: pngdec.c:790
png_pass_dsp_ymask
static const uint8_t png_pass_dsp_ymask[NB_PASSES]
Definition: pngdec.c:135
AVRational::num
int num
Numerator.
Definition: rational.h:59
progressframe.h
PNG_COLOR_TYPE_RGB_ALPHA
#define PNG_COLOR_TYPE_RGB_ALPHA
Definition: png.h:36
PNGDecContext::crow_buf
uint8_t * crow_buf
Definition: pngdec.c:114
AVCOL_TRC_GAMMA22
@ AVCOL_TRC_GAMMA22
also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
Definition: pixfmt.h:585
AV_DICT_DONT_STRDUP_VAL
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:79
PNGDecContext::last_row
uint8_t * last_row
Definition: pngdec.c:115
PNGDecContext::height
int height
Definition: pngdec.c:97
avassert.h
FF_CODEC_CAP_USES_PROGRESSFRAMES
#define FF_CODEC_CAP_USES_PROGRESSFRAMES
The decoder might make use of the ProgressFrame API.
Definition: codec_internal.h:68
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:671
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
pngdsp.h
zlib_wrapper.h
av_cold
#define av_cold
Definition: attributes.h:90
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:625
PNGDecContext::have_cicp
int have_cicp
Definition: pngdec.c:82
YUV2RGB
#define YUV2RGB(NAME, TYPE)
Definition: pngdec.c:340
mask
static const uint16_t mask[17]
Definition: lzw.c:38
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
stereo3d.h
AVMasteringDisplayMetadata::white_point
AVRational white_point[2]
CIE 1931 xy chromaticity coords of white point.
Definition: mastering_display_metadata.h:47
intreadwrite.h
PNGDecContext::tmp_row
uint8_t * tmp_row
Definition: pngdec.c:117
s
#define s(width, name)
Definition: cbs_vp9.c:198
PNGDecContext::clli_avg
uint32_t clli_avg
Definition: pngdec.c:88
AVCOL_PRI_NB
@ AVCOL_PRI_NB
Not part of ABI.
Definition: pixfmt.h:573
ff_apng_decoder
const FFCodec ff_apng_decoder
PNGDecContext::y_offset
int y_offset
Definition: pngdec.c:99
PNGDecContext::palette
uint32_t palette[256]
Definition: pngdec.c:113
g
const char * g
Definition: vf_curves.c:128
AV_GET_BUFFER_FLAG_REF
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:425
ff_thread_get_buffer
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
Definition: pthread_frame.c:986
GetByteContext::buffer
const uint8_t * buffer
Definition: bytestream.h:34
PNG_COLOR_TYPE_RGB
#define PNG_COLOR_TYPE_RGB
Definition: png.h:35
ff_png_decoder
const FFCodec ff_png_decoder
bits
uint8_t bits
Definition: vp3data.h:128
AV_EF_IGNORE_ERR
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: defs.h:53
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
PNGDecContext::hdr_state
enum PNGHeaderState hdr_state
Definition: pngdec.c:95
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1575
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
PNGDecContext::iccp_data
uint8_t * iccp_data
Definition: pngdec.c:72
ff_progress_frame_unref
void ff_progress_frame_unref(ProgressFrame *f)
Give up a reference to the underlying frame contained in a ProgressFrame and reset the ProgressFrame,...
Definition: decode.c:1742
ff_progress_frame_await
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before ff_progress_frame_await() has been called on them. reget_buffer() and buffer age optimizations no longer work. *The contents of buffers must not be written to after ff_progress_frame_report() has been called on them. This includes draw_edges(). Porting codecs to frame threading
channels
channels
Definition: aptx.h:31
decode.h
percent_missing
static int percent_missing(PNGDecContext *s)
Definition: pngdec.c:354
av_csp_primaries_id_from_desc
enum AVColorPrimaries av_csp_primaries_id_from_desc(const AVColorPrimariesDesc *prm)
Detects which enum AVColorPrimaries constant corresponds to the given complete gamut description.
Definition: csp.c:110
AVCOL_PRI_UNSPECIFIED
@ AVCOL_PRI_UNSPECIFIED
Definition: pixfmt.h:558
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:100
ff_decode_mastering_display_new
int ff_decode_mastering_display_new(const AVCodecContext *avctx, AVFrame *frame, AVMasteringDisplayMetadata **mdm)
Wrapper around av_mastering_display_metadata_create_side_data(), which rejects side data overridden b...
Definition: decode.c:2038
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:455
AVStereo3D::flags
int flags
Additional information about the frame packing.
Definition: stereo3d.h:182
AV_CODEC_ID_PNG
@ AV_CODEC_ID_PNG
Definition: codec_id.h:113
if
if(ret)
Definition: filter_design.txt:179
PNGDecContext
Definition: pngdec.c:61
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:110
AVDISCARD_ALL
@ AVDISCARD_ALL
discard all
Definition: defs.h:219
AV_PIX_FMT_GRAY8A
@ AV_PIX_FMT_GRAY8A
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:143
PNGDecContext::cicp_primaries
enum AVColorPrimaries cicp_primaries
Definition: pngdec.c:83
NULL
#define NULL
Definition: coverity.c:32
PNGDecContext::filter_type
int filter_type
Definition: pngdec.c:105
png_decode_idat
static int png_decode_idat(PNGDecContext *s, GetByteContext *gb, uint8_t *dst, ptrdiff_t dst_stride)
Definition: pngdec.c:445
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
png_dec_init
static av_cold int png_dec_init(AVCodecContext *avctx)
Definition: pngdec.c:1884
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:695
apng.h
pixel
uint8_t pixel
Definition: tiny_ssim.c:41
AV_WB16
#define AV_WB16(p, v)
Definition: intreadwrite.h:403
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
PNGDecContext::mdvc_min_lum
uint32_t mdvc_min_lum
Definition: pngdec.c:93
APNG_DISPOSE_OP_PREVIOUS
@ APNG_DISPOSE_OP_PREVIOUS
Definition: apng.h:33
AV_PIX_FMT_MONOBLACK
@ AV_PIX_FMT_MONOBLACK
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb.
Definition: pixfmt.h:83
AVCOL_PRI_BT709
@ AVCOL_PRI_BT709
also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP 177 Annex B
Definition: pixfmt.h:557
PNGDecContext::channels
int channels
Definition: pngdec.c:106
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
AV_FRAME_DATA_ICC_PROFILE
@ AV_FRAME_DATA_ICC_PROFILE
The data contains an ICC profile as an opaque octet buffer following the format described by ISO 1507...
Definition: frame.h:144
PNG_COLOR_TYPE_GRAY
#define PNG_COLOR_TYPE_GRAY
Definition: png.h:33
abs
#define abs(x)
Definition: cuda_runtime.h:35
UPDATE_THREAD_CONTEXT
#define UPDATE_THREAD_CONTEXT(func)
Definition: codec_internal.h:280
decode_sbit_chunk
static int decode_sbit_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:1070
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:81
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: defs.h:48
apng_reset_background
static void apng_reset_background(PNGDecContext *s, const AVFrame *p)
Definition: pngdec.c:1360
AVCOL_RANGE_UNSPECIFIED
@ AVCOL_RANGE_UNSPECIFIED
Definition: pixfmt.h:652
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
ff_png_pass_ymask
const uint8_t ff_png_pass_ymask[NB_PASSES]
Definition: png.c:27
output_frame
static int output_frame(PNGDecContext *s, AVFrame *f)
Definition: pngdec.c:1718
png_pass_mask
static const uint8_t png_pass_mask[NB_PASSES]
Definition: pngdec.c:130
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
bytestream2_tell
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
PNGDecContext::pass
int pass
Definition: pngdec.c:121
PNGDecContext::iccp_name
uint8_t iccp_name[82]
Definition: pngdec.c:71
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:28
handle_small_bpp
static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1105
PNG_FILTER_VALUE_NONE
#define PNG_FILTER_VALUE_NONE
Definition: png.h:40
f
f
Definition: af_crystalizer.c:121
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:476
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AV_PIX_FMT_RGB24
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:75
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
PNGDecContext::gb
GetByteContext gb
Definition: pngdec.c:65
AVPacket::size
int size
Definition: packet.h:525
handle_p_frame_png
static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1249
av_frame_ref
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:384
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:240
codec_internal.h
PNGDecContext::white_point
uint32_t white_point[2]
Definition: pngdec.c:78
av_frame_copy
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:999
png_put_interlaced_row
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:147
AV_PIX_FMT_YA16BE
@ AV_PIX_FMT_YA16BE
16 bits gray, 16 bits alpha (big-endian)
Definition: pixfmt.h:209
PNG_FILTER_VALUE_AVG
#define PNG_FILTER_VALUE_AVG
Definition: png.h:43
size
int size
Definition: twinvq_data.h:10344
av_make_q
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
ff_frame_new_side_data
int ff_frame_new_side_data(const AVCodecContext *avctx, AVFrame *frame, enum AVFrameSideDataType type, size_t size, AVFrameSideData **psd)
Wrapper around av_frame_new_side_data, which rejects side data overridden by the demuxer.
Definition: decode.c:1959
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
#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: codec_internal.h:54
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
AVFrameSideData::data
uint8_t * data
Definition: frame.h:252
PNG_FILTER_VALUE_PAETH
#define PNG_FILTER_VALUE_PAETH
Definition: png.h:44
AV_RL24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
Definition: bytestream.h:93
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:461
PNGDecContext::buffer
uint8_t * buffer
Definition: pngdec.c:119
PNGDecContext::zstream
FFZStream zstream
Definition: pngdec.c:126
PNG_FILTER_VALUE_UP
#define PNG_FILTER_VALUE_UP
Definition: png.h:42
FF_COMPLIANCE_NORMAL
#define FF_COMPLIANCE_NORMAL
Definition: defs.h:60
height
#define height
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
PNGDecContext::dispose_op
uint8_t dispose_op
Definition: pngdec.c:100
csp.h
av_crc_get_table
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
AVERROR_EXTERNAL
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:59
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:530
av_dict_free
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
Definition: dict.c:223
decode_trns_chunk
static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:989
AV_STEREO3D_FLAG_INVERT
#define AV_STEREO3D_FLAG_INVERT
Inverted views, Right/Bottom represents the left view.
Definition: stereo3d.h:164
PNGSIG
#define PNGSIG
Definition: png.h:49
PNGDecContext::buffer_size
int buffer_size
Definition: pngdec.c:120
populate_avctx_color_fields
static int populate_avctx_color_fields(AVCodecContext *avctx, AVFrame *frame)
Definition: pngdec.c:661
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1594
PNGDecContext::stereo_mode
int stereo_mode
Definition: pngdec.c:75
ff_pngdsp_init
av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
Definition: pngdsp.c:56
av_image_get_linesize
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
PNGDecContext::frame_metadata
AVDictionary * frame_metadata
Definition: pngdec.c:69
PNGDecContext::significant_bits
int significant_bits
Definition: pngdec.c:111
PNGDSPContext::add_bytes_l2
void(* add_bytes_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition: pngdsp.h:28
PNG_FILTER_VALUE_SUB
#define PNG_FILTER_VALUE_SUB
Definition: png.h:41
bprint.h
AV_PIX_FMT_RGB48BE
@ AV_PIX_FMT_RGB48BE
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:109
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
PNGDecContext::mdvc_primaries
uint16_t mdvc_primaries[3][2]
Definition: pngdec.c:90
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
PNGDecContext::x_offset
int x_offset
Definition: pngdec.c:99
PNGDecContext::display_primaries
uint32_t display_primaries[3][2]
Definition: pngdec.c:79
av_bprint_get_buffer
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:223
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:56
png_handle_row
static void png_handle_row(PNGDecContext *s, uint8_t *dst, ptrdiff_t dst_stride)
Definition: pngdec.c:364
av_fast_padded_malloc
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:52
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1404
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
decode_fctl_chunk
static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:1178
decode_plte_chunk
static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:966
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:606
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
APNG_BLEND_OP_SOURCE
@ APNG_BLEND_OP_SOURCE
Definition: apng.h:37
AVMasteringDisplayMetadata
Mastering display metadata capable of representing the color volume of the display used to master the...
Definition: mastering_display_metadata.h:38
ff_inflate_end
void ff_inflate_end(FFZStream *zstream)
Wrapper around inflateEnd().
GetByteContext::buffer_end
const uint8_t * buffer_end
Definition: bytestream.h:34
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
AV_FRAME_FLAG_INTERLACED
#define AV_FRAME_FLAG_INTERLACED
A flag to mark frames whose content is interlaced.
Definition: frame.h:633
PNGDecContext::avctx
AVCodecContext * avctx
Definition: pngdec.c:63
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:669
FF_CODEC_CAP_ICC_PROFILES
#define FF_CODEC_CAP_ICC_PROFILES
Codec supports embedded ICC profiles (AV_FRAME_DATA_ICC_PROFILE).
Definition: codec_internal.h:81
avcodec.h
PNGHeaderState
PNGHeaderState
Definition: pngdec.c:51
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:84
tag
uint32_t tag
Definition: movenc.c:1851
ret
ret
Definition: filter_design.txt:187
pixfmt.h
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
PNGDecContext::iccp_data_len
size_t iccp_data_len
Definition: pngdec.c:73
AVCodecContext::strict_std_compliance
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1379
AVStereo3D::type
enum AVStereo3DType type
How views are packed within the video.
Definition: stereo3d.h:177
ff_decode_content_light_new
int ff_decode_content_light_new(const AVCodecContext *avctx, AVFrame *frame, AVContentLightMetadata **clm)
Wrapper around av_content_light_metadata_create_side_data(), which rejects side data overridden by th...
Definition: decode.c:2083
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:99
ff_thread_finish_setup
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call ff_thread_finish_setup() afterwards. If some code can 't be moved
PNGDecContext::compression_type
int compression_type
Definition: pngdec.c:103
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
U
#define U(x)
Definition: vpx_arith.h:37
ff_progress_frame_replace
void ff_progress_frame_replace(ProgressFrame *dst, const ProgressFrame *src)
Do nothing if dst and src already refer to the same AVFrame; otherwise unreference dst and if src is ...
Definition: decode.c:1749
iso88591_to_utf8
static char * iso88591_to_utf8(const char *in, size_t size_in)
Definition: pngdec.c:518
PNG_IHDR
@ PNG_IHDR
Definition: pngdec.c:52
ff_png_filter_row
void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, uint8_t *src, uint8_t *last, int size, int bpp)
Definition: pngdec.c:283
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AVFrame::height
int height
Definition: frame.h:446
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1602
decode_frame_common
static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p, const AVPacket *avpkt)
Definition: pngdec.c:1376
av_crc
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
UNROLL_FILTER
#define UNROLL_FILTER(op)
Definition: pngdec.c:268
AVRational::den
int den
Denominator.
Definition: rational.h:60
mode
mode
Definition: ebur128.h:83
PNGDecContext::last_picture
ProgressFrame last_picture
Definition: pngdec.c:66
PNGDecContext::transparent_color_be
uint8_t transparent_color_be[6]
Definition: pngdec.c:110
update_thread_context
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have update_thread_context() run it in the next thread. Add AV_CODEC_CAP_FRAME_THREADS to the codec capabilities. There will be very little speed gain at this point but it should work. Use ff_thread_get_buffer()(or ff_progress_frame_get_buffer() in case you have inter-frame dependencies and use the ProgressFrame API) to allocate frame buffers. Call ff_progress_frame_report() after some part of the current picture has decoded. A good place to put this is where draw_horiz_band() is called - add this if it isn 't called anywhere
av_fast_padded_mallocz
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:65
PNGDecContext::have_chrm
int have_chrm
Definition: pngdec.c:77
png_pass_dsp_mask
static const uint8_t png_pass_dsp_mask[NB_PASSES]
Definition: pngdec.c:140
AVCodecContext::discard_damaged_percentage
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:1970
AVMasteringDisplayMetadata::min_luminance
AVRational min_luminance
Min luminance of mastering display (cd/m^2).
Definition: mastering_display_metadata.h:52
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:1396
PNG_IDAT
@ PNG_IDAT
Definition: pngdec.c:57
AV_CRC_32_IEEE_LE
@ AV_CRC_32_IEEE_LE
Definition: crc.h:53
decode_iccp_chunk
static int decode_iccp_chunk(PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:1037
APNG_DISPOSE_OP_BACKGROUND
@ APNG_DISPOSE_OP_BACKGROUND
Definition: apng.h:32
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FFZStream
Definition: zlib_wrapper.h:27
mem.h
PNGDecContext::mdvc_white_point
uint16_t mdvc_white_point[2]
Definition: pngdec.c:91
mastering_display_metadata.h
decode_ihdr_chunk
static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:589
PNGDecContext::dsp
PNGDSPContext dsp
Definition: pngdec.c:62
av_stereo3d_create_side_data
AVStereo3D * av_stereo3d_create_side_data(AVFrame *frame)
Allocate a complete AVFrameSideData and add it to the frame.
Definition: stereo3d.c:34
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:250
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:470
ProgressFrame
The ProgressFrame structure.
Definition: progressframe.h:73
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVContentLightMetadata::MaxFALL
unsigned MaxFALL
Max average light level per frame (cd/m^2).
Definition: mastering_display_metadata.h:116
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
png.h
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
av_dict_set
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:88
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
ff_inflate_init
int ff_inflate_init(FFZStream *zstream, void *logctx)
Wrapper around inflateInit().
d
d
Definition: ffmpeg_filter.c:424
bytestream.h
imgutils.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:419
PNG_COLOR_TYPE_GRAY_ALPHA
#define PNG_COLOR_TYPE_GRAY_ALPHA
Definition: png.h:37
AVFrameSideData::metadata
AVDictionary * metadata
Definition: frame.h:254
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
AVCOL_TRC_SMPTE428
@ AVCOL_TRC_SMPTE428
SMPTE ST 428-1.
Definition: pixfmt.h:599
MNGSIG
#define MNGSIG
Definition: png.h:50
PNGDecContext::cicp_trc
enum AVColorTransferCharacteristic cicp_trc
Definition: pngdec.c:84
PNGDecContext::interlace_type
int interlace_type
Definition: pngdec.c:104
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AVStereo3D
Stereo 3D type: this structure describes how two videos are packed within a single video surface,...
Definition: stereo3d.h:173
handle_p_frame_apng
static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1271
PNGDecContext::y
int y
Definition: pngdec.c:125
av_image_check_size
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:318
OP_SUB
#define OP_SUB(x, s, l)
AVColorRange
AVColorRange
Visual content value range.
Definition: pixfmt.h:651
decode_zbuf
static int decode_zbuf(AVBPrint *bp, const uint8_t *data, const uint8_t *data_end, void *logctx)
Definition: pngdec.c:476
PNGDecContext::cur_w
int cur_w
Definition: pngdec.c:98
AVCodecContext::sample_aspect_ratio
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:642
PNG_COLOR_TYPE_PALETTE
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:34
AV_DICT_DONT_STRDUP_KEY
#define AV_DICT_DONT_STRDUP_KEY
Take ownership of a key that's been allocated with av_malloc() or another memory allocation function.
Definition: dict.h:77
PNGDecContext::bpp
int bpp
Definition: pngdec.c:108
av_get_pix_fmt_name
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:2885
PNGDecContext::has_trns
int has_trns
Definition: pngdec.c:109
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:345