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 "libavutil/avassert.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/crc.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/stereo3d.h"
31 
32 #include "avcodec.h"
33 #include "bytestream.h"
34 #include "internal.h"
35 #include "apng.h"
36 #include "png.h"
37 #include "pngdsp.h"
38 #include "thread.h"
39 
40 #include <zlib.h>
41 
43  PNG_IHDR = 1 << 0,
44  PNG_PLTE = 1 << 1,
45 };
46 
48  PNG_IDAT = 1 << 0,
49  PNG_ALLIMAGE = 1 << 1,
50 };
51 
52 typedef struct PNGDecContext {
55 
59 
61 
62  uint8_t iccp_name[82];
63  uint8_t *iccp_data;
64  size_t iccp_data_len;
65 
67 
68  int have_chrm;
69  uint32_t white_point[2];
70  uint32_t display_primaries[3][2];
71 
74  int width, height;
75  int cur_w, cur_h;
76  int last_w, last_h;
79  uint8_t dispose_op, blend_op;
80  uint8_t last_dispose_op;
81  int bit_depth;
86  int channels;
88  int bpp;
89  int has_trns;
91 
92  uint8_t *background_buf;
94  uint32_t palette[256];
95  uint8_t *crow_buf;
96  uint8_t *last_row;
97  unsigned int last_row_size;
98  uint8_t *tmp_row;
99  unsigned int tmp_row_size;
100  uint8_t *buffer;
102  int pass;
103  int crow_size; /* compressed row size (include filter type) */
104  int row_size; /* decompressed row size */
105  int pass_row_size; /* decompress row size of the current pass */
106  int y;
107  z_stream zstream;
108 } PNGDecContext;
109 
110 /* Mask to determine which pixels are valid in a pass */
111 static const uint8_t png_pass_mask[NB_PASSES] = {
112  0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
113 };
114 
115 /* Mask to determine which y pixels can be written in a pass */
116 static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
117  0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
118 };
119 
120 /* Mask to determine which pixels to overwrite while displaying */
121 static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
122  0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
123 };
124 
125 /* NOTE: we try to construct a good looking image at each pass. width
126  * is the original image width. We also do pixel format conversion at
127  * this stage */
128 static void png_put_interlaced_row(uint8_t *dst, int width,
129  int bits_per_pixel, int pass,
130  int color_type, const uint8_t *src)
131 {
132  int x, mask, dsp_mask, j, src_x, b, bpp;
133  uint8_t *d;
134  const uint8_t *s;
135 
137  dsp_mask = png_pass_dsp_mask[pass];
138 
139  switch (bits_per_pixel) {
140  case 1:
141  src_x = 0;
142  for (x = 0; x < width; x++) {
143  j = (x & 7);
144  if ((dsp_mask << j) & 0x80) {
145  b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
146  dst[x >> 3] &= 0xFF7F>>j;
147  dst[x >> 3] |= b << (7 - j);
148  }
149  if ((mask << j) & 0x80)
150  src_x++;
151  }
152  break;
153  case 2:
154  src_x = 0;
155  for (x = 0; x < width; x++) {
156  int j2 = 2 * (x & 3);
157  j = (x & 7);
158  if ((dsp_mask << j) & 0x80) {
159  b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
160  dst[x >> 2] &= 0xFF3F>>j2;
161  dst[x >> 2] |= b << (6 - j2);
162  }
163  if ((mask << j) & 0x80)
164  src_x++;
165  }
166  break;
167  case 4:
168  src_x = 0;
169  for (x = 0; x < width; x++) {
170  int j2 = 4*(x&1);
171  j = (x & 7);
172  if ((dsp_mask << j) & 0x80) {
173  b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
174  dst[x >> 1] &= 0xFF0F>>j2;
175  dst[x >> 1] |= b << (4 - j2);
176  }
177  if ((mask << j) & 0x80)
178  src_x++;
179  }
180  break;
181  default:
182  bpp = bits_per_pixel >> 3;
183  d = dst;
184  s = src;
185  for (x = 0; x < width; x++) {
186  j = x & 7;
187  if ((dsp_mask << j) & 0x80) {
188  memcpy(d, s, bpp);
189  }
190  d += bpp;
191  if ((mask << j) & 0x80)
192  s += bpp;
193  }
194  break;
195  }
196 }
197 
198 void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
199  int w, int bpp)
200 {
201  int i;
202  for (i = 0; i < w; i++) {
203  int a, b, c, p, pa, pb, pc;
204 
205  a = dst[i - bpp];
206  b = top[i];
207  c = top[i - bpp];
208 
209  p = b - c;
210  pc = a - c;
211 
212  pa = abs(p);
213  pb = abs(pc);
214  pc = abs(p + pc);
215 
216  if (pa <= pb && pa <= pc)
217  p = a;
218  else if (pb <= pc)
219  p = b;
220  else
221  p = c;
222  dst[i] = p + src[i];
223  }
224 }
225 
226 #define UNROLL1(bpp, op) \
227  { \
228  r = dst[0]; \
229  if (bpp >= 2) \
230  g = dst[1]; \
231  if (bpp >= 3) \
232  b = dst[2]; \
233  if (bpp >= 4) \
234  a = dst[3]; \
235  for (; i <= size - bpp; i += bpp) { \
236  dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
237  if (bpp == 1) \
238  continue; \
239  dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
240  if (bpp == 2) \
241  continue; \
242  dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
243  if (bpp == 3) \
244  continue; \
245  dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
246  } \
247  }
248 
249 #define UNROLL_FILTER(op) \
250  if (bpp == 1) { \
251  UNROLL1(1, op) \
252  } else if (bpp == 2) { \
253  UNROLL1(2, op) \
254  } else if (bpp == 3) { \
255  UNROLL1(3, op) \
256  } else if (bpp == 4) { \
257  UNROLL1(4, op) \
258  } \
259  for (; i < size; i++) { \
260  dst[i] = op(dst[i - bpp], src[i], last[i]); \
261  }
262 
263 /* NOTE: 'dst' can be equal to 'last' */
264 void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
265  uint8_t *src, uint8_t *last, int size, int bpp)
266 {
267  int i, p, r, g, b, a;
268 
269  switch (filter_type) {
271  memcpy(dst, src, size);
272  break;
274  for (i = 0; i < bpp; i++)
275  dst[i] = src[i];
276  if (bpp == 4) {
277  p = *(int *)dst;
278  for (; i < size; i += bpp) {
279  unsigned s = *(int *)(src + i);
280  p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
281  *(int *)(dst + i) = p;
282  }
283  } else {
284 #define OP_SUB(x, s, l) ((x) + (s))
286  }
287  break;
288  case PNG_FILTER_VALUE_UP:
289  dsp->add_bytes_l2(dst, src, last, size);
290  break;
292  for (i = 0; i < bpp; i++) {
293  p = (last[i] >> 1);
294  dst[i] = p + src[i];
295  }
296 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
298  break;
300  for (i = 0; i < bpp; i++) {
301  p = last[i];
302  dst[i] = p + src[i];
303  }
304  if (bpp > 2 && size > 4) {
305  /* would write off the end of the array if we let it process
306  * the last pixel with bpp=3 */
307  int w = (bpp & 3) ? size - 3 : size;
308 
309  if (w > i) {
310  dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
311  i = w;
312  }
313  }
314  ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
315  break;
316  }
317 }
318 
319 /* This used to be called "deloco" in FFmpeg
320  * and is actually an inverse reversible colorspace transformation */
321 #define YUV2RGB(NAME, TYPE) \
322 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
323 { \
324  int i; \
325  for (i = 0; i < size; i += 3 + alpha) { \
326  int g = dst [i + 1]; \
327  dst[i + 0] += g; \
328  dst[i + 2] += g; \
329  } \
330 }
331 
332 YUV2RGB(rgb8, uint8_t)
333 YUV2RGB(rgb16, uint16_t)
334 
336 {
337  if (s->interlace_type) {
338  return 100 - 100 * s->pass / (NB_PASSES - 1);
339  } else {
340  return 100 - 100 * s->y / s->cur_h;
341  }
342 }
343 
344 /* process exactly one decompressed row */
345 static void png_handle_row(PNGDecContext *s, uint8_t *dst, ptrdiff_t dst_stride)
346 {
347  uint8_t *ptr, *last_row;
348  int got_line;
349 
350  if (!s->interlace_type) {
351  ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
352  if (s->y == 0)
353  last_row = s->last_row;
354  else
355  last_row = ptr - dst_stride;
356 
357  ff_png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
358  last_row, s->row_size, s->bpp);
359  /* loco lags by 1 row so that it doesn't interfere with top prediction */
360  if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
361  if (s->bit_depth == 16) {
362  deloco_rgb16((uint16_t *)(ptr - dst_stride), s->row_size / 2,
363  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
364  } else {
365  deloco_rgb8(ptr - dst_stride, s->row_size,
366  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
367  }
368  }
369  s->y++;
370  if (s->y == s->cur_h) {
371  s->pic_state |= PNG_ALLIMAGE;
372  if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
373  if (s->bit_depth == 16) {
374  deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
375  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
376  } else {
377  deloco_rgb8(ptr, s->row_size,
378  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
379  }
380  }
381  }
382  } else {
383  got_line = 0;
384  for (;;) {
385  ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
386  if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
387  /* if we already read one row, it is time to stop to
388  * wait for the next one */
389  if (got_line)
390  break;
391  ff_png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
392  s->last_row, s->pass_row_size, s->bpp);
393  FFSWAP(uint8_t *, s->last_row, s->tmp_row);
394  FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
395  got_line = 1;
396  }
397  if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
398  png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
399  s->color_type, s->last_row);
400  }
401  s->y++;
402  if (s->y == s->cur_h) {
403  memset(s->last_row, 0, s->row_size);
404  for (;;) {
405  if (s->pass == NB_PASSES - 1) {
406  s->pic_state |= PNG_ALLIMAGE;
407  goto the_end;
408  } else {
409  s->pass++;
410  s->y = 0;
411  s->pass_row_size = ff_png_pass_row_size(s->pass,
412  s->bits_per_pixel,
413  s->cur_w);
414  s->crow_size = s->pass_row_size + 1;
415  if (s->pass_row_size != 0)
416  break;
417  /* skip pass if empty row */
418  }
419  }
420  }
421  }
422 the_end:;
423  }
424 }
425 
427  uint8_t *dst, ptrdiff_t dst_stride)
428 {
429  int ret;
430  s->zstream.avail_in = bytestream2_get_bytes_left(gb);
431  s->zstream.next_in = gb->buffer;
432 
433  /* decode one line if possible */
434  while (s->zstream.avail_in > 0) {
435  ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
436  if (ret != Z_OK && ret != Z_STREAM_END) {
437  av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
438  return AVERROR_EXTERNAL;
439  }
440  if (s->zstream.avail_out == 0) {
441  if (!(s->pic_state & PNG_ALLIMAGE)) {
442  png_handle_row(s, dst, dst_stride);
443  }
444  s->zstream.avail_out = s->crow_size;
445  s->zstream.next_out = s->crow_buf;
446  }
447  if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
448  av_log(s->avctx, AV_LOG_WARNING,
449  "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
450  return 0;
451  }
452  }
453  return 0;
454 }
455 
456 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
457  const uint8_t *data_end)
458 {
459  z_stream zstream;
460  unsigned char *buf;
461  unsigned buf_size;
462  int ret;
463 
464  zstream.zalloc = ff_png_zalloc;
465  zstream.zfree = ff_png_zfree;
466  zstream.opaque = NULL;
467  if (inflateInit(&zstream) != Z_OK)
468  return AVERROR_EXTERNAL;
469  zstream.next_in = data;
470  zstream.avail_in = data_end - data;
472 
473  while (zstream.avail_in > 0) {
474  av_bprint_get_buffer(bp, 2, &buf, &buf_size);
475  if (buf_size < 2) {
476  ret = AVERROR(ENOMEM);
477  goto fail;
478  }
479  zstream.next_out = buf;
480  zstream.avail_out = buf_size - 1;
481  ret = inflate(&zstream, Z_PARTIAL_FLUSH);
482  if (ret != Z_OK && ret != Z_STREAM_END) {
484  goto fail;
485  }
486  bp->len += zstream.next_out - buf;
487  if (ret == Z_STREAM_END)
488  break;
489  }
490  inflateEnd(&zstream);
491  bp->str[bp->len] = 0;
492  return 0;
493 
494 fail:
495  inflateEnd(&zstream);
497  return ret;
498 }
499 
500 static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
501 {
502  size_t extra = 0, i;
503  uint8_t *out, *q;
504 
505  for (i = 0; i < size_in; i++)
506  extra += in[i] >= 0x80;
507  if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
508  return NULL;
509  q = out = av_malloc(size_in + extra + 1);
510  if (!out)
511  return NULL;
512  for (i = 0; i < size_in; i++) {
513  if (in[i] >= 0x80) {
514  *(q++) = 0xC0 | (in[i] >> 6);
515  *(q++) = 0x80 | (in[i] & 0x3F);
516  } else {
517  *(q++) = in[i];
518  }
519  }
520  *(q++) = 0;
521  return out;
522 }
523 
524 static int decode_text_chunk(PNGDecContext *s, GetByteContext *gb, int compressed)
525 {
526  int ret, method;
527  const uint8_t *data = gb->buffer;
528  const uint8_t *data_end = gb->buffer_end;
529  const uint8_t *keyword = data;
530  const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
531  uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
532  unsigned text_len;
533  AVBPrint bp;
534 
535  if (!keyword_end)
536  return AVERROR_INVALIDDATA;
537  data = keyword_end + 1;
538 
539  if (compressed) {
540  if (data == data_end)
541  return AVERROR_INVALIDDATA;
542  method = *(data++);
543  if (method)
544  return AVERROR_INVALIDDATA;
545  if ((ret = decode_zbuf(&bp, data, data_end)) < 0)
546  return ret;
547  text_len = bp.len;
548  ret = av_bprint_finalize(&bp, (char **)&text);
549  if (ret < 0)
550  return ret;
551  } else {
552  text = (uint8_t *)data;
553  text_len = data_end - text;
554  }
555 
556  kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
557  txt_utf8 = iso88591_to_utf8(text, text_len);
558  if (text != data)
559  av_free(text);
560  if (!(kw_utf8 && txt_utf8)) {
561  av_free(kw_utf8);
562  av_free(txt_utf8);
563  return AVERROR(ENOMEM);
564  }
565 
566  av_dict_set(&s->frame_metadata, kw_utf8, txt_utf8,
568  return 0;
569 }
570 
572  GetByteContext *gb)
573 {
574  if (bytestream2_get_bytes_left(gb) != 13)
575  return AVERROR_INVALIDDATA;
576 
577  if (s->pic_state & PNG_IDAT) {
578  av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
579  return AVERROR_INVALIDDATA;
580  }
581 
582  if (s->hdr_state & PNG_IHDR) {
583  av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
584  return AVERROR_INVALIDDATA;
585  }
586 
587  s->width = s->cur_w = bytestream2_get_be32(gb);
588  s->height = s->cur_h = bytestream2_get_be32(gb);
589  if (av_image_check_size(s->width, s->height, 0, avctx)) {
590  s->cur_w = s->cur_h = s->width = s->height = 0;
591  av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
592  return AVERROR_INVALIDDATA;
593  }
594  s->bit_depth = bytestream2_get_byte(gb);
595  if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
596  s->bit_depth != 8 && s->bit_depth != 16) {
597  av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
598  goto error;
599  }
600  s->color_type = bytestream2_get_byte(gb);
601  s->compression_type = bytestream2_get_byte(gb);
602  if (s->compression_type) {
603  av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
604  goto error;
605  }
606  s->filter_type = bytestream2_get_byte(gb);
607  s->interlace_type = bytestream2_get_byte(gb);
608  s->hdr_state |= PNG_IHDR;
609  if (avctx->debug & FF_DEBUG_PICT_INFO)
610  av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
611  "compression_type=%d filter_type=%d interlace_type=%d\n",
612  s->width, s->height, s->bit_depth, s->color_type,
613  s->compression_type, s->filter_type, s->interlace_type);
614 
615  return 0;
616 error:
617  s->cur_w = s->cur_h = s->width = s->height = 0;
618  s->bit_depth = 8;
619  return AVERROR_INVALIDDATA;
620 }
621 
623  GetByteContext *gb)
624 {
625  if (s->pic_state & PNG_IDAT) {
626  av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
627  return AVERROR_INVALIDDATA;
628  }
629  avctx->sample_aspect_ratio.num = bytestream2_get_be32(gb);
630  avctx->sample_aspect_ratio.den = bytestream2_get_be32(gb);
631  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
632  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
633  bytestream2_skip(gb, 1); /* unit specifier */
634 
635  return 0;
636 }
637 
639  GetByteContext *gb, AVFrame *p)
640 {
641  int ret;
642  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
643 
644  if (!(s->hdr_state & PNG_IHDR)) {
645  av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
646  return AVERROR_INVALIDDATA;
647  }
648  if (!(s->pic_state & PNG_IDAT)) {
649  /* init image info */
650  ret = ff_set_dimensions(avctx, s->width, s->height);
651  if (ret < 0)
652  return ret;
653 
654  s->channels = ff_png_get_nb_channels(s->color_type);
655  s->bits_per_pixel = s->bit_depth * s->channels;
656  s->bpp = (s->bits_per_pixel + 7) >> 3;
657  s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
658 
659  if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
660  s->color_type == PNG_COLOR_TYPE_RGB) {
661  avctx->pix_fmt = AV_PIX_FMT_RGB24;
662  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
663  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
664  avctx->pix_fmt = AV_PIX_FMT_RGBA;
665  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
666  s->color_type == PNG_COLOR_TYPE_GRAY) {
667  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
668  } else if (s->bit_depth == 16 &&
669  s->color_type == PNG_COLOR_TYPE_GRAY) {
670  avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
671  } else if (s->bit_depth == 16 &&
672  s->color_type == PNG_COLOR_TYPE_RGB) {
673  avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
674  } else if (s->bit_depth == 16 &&
675  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
676  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
677  } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
678  s->color_type == PNG_COLOR_TYPE_PALETTE) {
679  avctx->pix_fmt = AV_PIX_FMT_PAL8;
680  } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
681  avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
682  } else if (s->bit_depth == 8 &&
683  s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
684  avctx->pix_fmt = AV_PIX_FMT_YA8;
685  } else if (s->bit_depth == 16 &&
686  s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
687  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
688  } else {
690  "Bit depth %d color type %d",
691  s->bit_depth, s->color_type);
692  return AVERROR_PATCHWELCOME;
693  }
694 
695  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
696  switch (avctx->pix_fmt) {
697  case AV_PIX_FMT_RGB24:
698  avctx->pix_fmt = AV_PIX_FMT_RGBA;
699  break;
700 
701  case AV_PIX_FMT_RGB48BE:
702  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
703  break;
704 
705  case AV_PIX_FMT_GRAY8:
706  avctx->pix_fmt = AV_PIX_FMT_YA8;
707  break;
708 
709  case AV_PIX_FMT_GRAY16BE:
710  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
711  break;
712 
713  default:
714  avpriv_request_sample(avctx, "bit depth %d "
715  "and color type %d with TRNS",
716  s->bit_depth, s->color_type);
717  return AVERROR_INVALIDDATA;
718  }
719 
720  s->bpp += byte_depth;
721  }
722 
723  ff_thread_release_buffer(avctx, &s->picture);
724  if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
725  return ret;
726 
728  p->key_frame = 1;
729  p->interlaced_frame = !!s->interlace_type;
730 
731  ff_thread_finish_setup(avctx);
732 
733  /* compute the compressed row size */
734  if (!s->interlace_type) {
735  s->crow_size = s->row_size + 1;
736  } else {
737  s->pass = 0;
738  s->pass_row_size = ff_png_pass_row_size(s->pass,
739  s->bits_per_pixel,
740  s->cur_w);
741  s->crow_size = s->pass_row_size + 1;
742  }
743  ff_dlog(avctx, "row_size=%d crow_size =%d\n",
744  s->row_size, s->crow_size);
745 
746  /* copy the palette if needed */
747  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
748  memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
749  /* empty row is used if differencing to the first row */
750  av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size);
751  if (!s->last_row)
752  return AVERROR_INVALIDDATA;
753  if (s->interlace_type ||
754  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
755  av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size);
756  if (!s->tmp_row)
757  return AVERROR_INVALIDDATA;
758  }
759  /* compressed row */
760  av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
761  if (!s->buffer)
762  return AVERROR(ENOMEM);
763 
764  /* we want crow_buf+1 to be 16-byte aligned */
765  s->crow_buf = s->buffer + 15;
766  s->zstream.avail_out = s->crow_size;
767  s->zstream.next_out = s->crow_buf;
768  }
769 
770  s->pic_state |= PNG_IDAT;
771 
772  /* set image to non-transparent bpp while decompressing */
773  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
774  s->bpp -= byte_depth;
775 
776  ret = png_decode_idat(s, gb, p->data[0], p->linesize[0]);
777 
778  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
779  s->bpp += byte_depth;
780 
781  if (ret < 0)
782  return ret;
783 
784  return 0;
785 }
786 
788  GetByteContext *gb)
789 {
790  int length = bytestream2_get_bytes_left(gb);
791  int n, i, r, g, b;
792 
793  if ((length % 3) != 0 || length > 256 * 3)
794  return AVERROR_INVALIDDATA;
795  /* read the palette */
796  n = length / 3;
797  for (i = 0; i < n; i++) {
798  r = bytestream2_get_byte(gb);
799  g = bytestream2_get_byte(gb);
800  b = bytestream2_get_byte(gb);
801  s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
802  }
803  for (; i < 256; i++)
804  s->palette[i] = (0xFFU << 24);
805  s->hdr_state |= PNG_PLTE;
806 
807  return 0;
808 }
809 
811  GetByteContext *gb)
812 {
813  int length = bytestream2_get_bytes_left(gb);
814  int v, i;
815 
816  if (!(s->hdr_state & PNG_IHDR)) {
817  av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
818  return AVERROR_INVALIDDATA;
819  }
820 
821  if (s->pic_state & PNG_IDAT) {
822  av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
823  return AVERROR_INVALIDDATA;
824  }
825 
826  if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
827  if (length > 256 || !(s->hdr_state & PNG_PLTE))
828  return AVERROR_INVALIDDATA;
829 
830  for (i = 0; i < length; i++) {
831  unsigned v = bytestream2_get_byte(gb);
832  s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
833  }
834  } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
835  if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
836  (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
837  s->bit_depth == 1)
838  return AVERROR_INVALIDDATA;
839 
840  for (i = 0; i < length / 2; i++) {
841  /* only use the least significant bits */
842  v = av_mod_uintp2(bytestream2_get_be16(gb), s->bit_depth);
843 
844  if (s->bit_depth > 8)
845  AV_WB16(&s->transparent_color_be[2 * i], v);
846  else
847  s->transparent_color_be[i] = v;
848  }
849  } else {
850  return AVERROR_INVALIDDATA;
851  }
852 
853  s->has_trns = 1;
854 
855  return 0;
856 }
857 
859 {
860  int ret, cnt = 0;
861  AVBPrint bp;
862 
863  while ((s->iccp_name[cnt++] = bytestream2_get_byte(gb)) && cnt < 81);
864  if (cnt > 80) {
865  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
867  goto fail;
868  }
869 
870  if (bytestream2_get_byte(gb) != 0) {
871  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
873  goto fail;
874  }
875 
876  if ((ret = decode_zbuf(&bp, gb->buffer, gb->buffer_end)) < 0)
877  return ret;
878 
879  av_freep(&s->iccp_data);
880  ret = av_bprint_finalize(&bp, (char **)&s->iccp_data);
881  if (ret < 0)
882  return ret;
883  s->iccp_data_len = bp.len;
884 
885  return 0;
886 fail:
887  s->iccp_name[0] = 0;
888  return ret;
889 }
890 
892 {
893  if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
894  int i, j, k;
895  uint8_t *pd = p->data[0];
896  for (j = 0; j < s->height; j++) {
897  i = s->width / 8;
898  for (k = 7; k >= 1; k--)
899  if ((s->width&7) >= k)
900  pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
901  for (i--; i >= 0; i--) {
902  pd[8*i + 7]= pd[i] & 1;
903  pd[8*i + 6]= (pd[i]>>1) & 1;
904  pd[8*i + 5]= (pd[i]>>2) & 1;
905  pd[8*i + 4]= (pd[i]>>3) & 1;
906  pd[8*i + 3]= (pd[i]>>4) & 1;
907  pd[8*i + 2]= (pd[i]>>5) & 1;
908  pd[8*i + 1]= (pd[i]>>6) & 1;
909  pd[8*i + 0]= pd[i]>>7;
910  }
911  pd += p->linesize[0];
912  }
913  } else if (s->bits_per_pixel == 2) {
914  int i, j;
915  uint8_t *pd = p->data[0];
916  for (j = 0; j < s->height; j++) {
917  i = s->width / 4;
918  if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
919  if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
920  if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
921  if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
922  for (i--; i >= 0; i--) {
923  pd[4*i + 3]= pd[i] & 3;
924  pd[4*i + 2]= (pd[i]>>2) & 3;
925  pd[4*i + 1]= (pd[i]>>4) & 3;
926  pd[4*i + 0]= pd[i]>>6;
927  }
928  } else {
929  if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
930  if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
931  if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
932  for (i--; i >= 0; i--) {
933  pd[4*i + 3]= ( pd[i] & 3)*0x55;
934  pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
935  pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
936  pd[4*i + 0]= ( pd[i]>>6 )*0x55;
937  }
938  }
939  pd += p->linesize[0];
940  }
941  } else if (s->bits_per_pixel == 4) {
942  int i, j;
943  uint8_t *pd = p->data[0];
944  for (j = 0; j < s->height; j++) {
945  i = s->width/2;
946  if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
947  if (s->width&1) pd[2*i+0]= pd[i]>>4;
948  for (i--; i >= 0; i--) {
949  pd[2*i + 1] = pd[i] & 15;
950  pd[2*i + 0] = pd[i] >> 4;
951  }
952  } else {
953  if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
954  for (i--; i >= 0; i--) {
955  pd[2*i + 1] = (pd[i] & 15) * 0x11;
956  pd[2*i + 0] = (pd[i] >> 4) * 0x11;
957  }
958  }
959  pd += p->linesize[0];
960  }
961  }
962 }
963 
965  GetByteContext *gb)
966 {
967  uint32_t sequence_number;
968  int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
969 
970  if (bytestream2_get_bytes_left(gb) != 26)
971  return AVERROR_INVALIDDATA;
972 
973  if (!(s->hdr_state & PNG_IHDR)) {
974  av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
975  return AVERROR_INVALIDDATA;
976  }
977 
978  if (s->pic_state & PNG_IDAT) {
979  av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
980  return AVERROR_INVALIDDATA;
981  }
982 
983  s->last_w = s->cur_w;
984  s->last_h = s->cur_h;
985  s->last_x_offset = s->x_offset;
986  s->last_y_offset = s->y_offset;
987  s->last_dispose_op = s->dispose_op;
988 
989  sequence_number = bytestream2_get_be32(gb);
990  cur_w = bytestream2_get_be32(gb);
991  cur_h = bytestream2_get_be32(gb);
992  x_offset = bytestream2_get_be32(gb);
993  y_offset = bytestream2_get_be32(gb);
994  bytestream2_skip(gb, 4); /* delay_num (2), delay_den (2) */
995  dispose_op = bytestream2_get_byte(gb);
996  blend_op = bytestream2_get_byte(gb);
997 
998  if (sequence_number == 0 &&
999  (cur_w != s->width ||
1000  cur_h != s->height ||
1001  x_offset != 0 ||
1002  y_offset != 0) ||
1003  cur_w <= 0 || cur_h <= 0 ||
1004  x_offset < 0 || y_offset < 0 ||
1005  cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1006  return AVERROR_INVALIDDATA;
1007 
1008  if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1009  av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1010  return AVERROR_INVALIDDATA;
1011  }
1012 
1013  if ((sequence_number == 0 || !s->last_picture.f->data[0]) &&
1014  dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1015  // No previous frame to revert to for the first frame
1016  // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1017  dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1018  }
1019 
1020  if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1021  avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1022  avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1023  avctx->pix_fmt == AV_PIX_FMT_PAL8 ||
1024  avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1025  avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1026  avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1027  )) {
1028  // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1029  blend_op = APNG_BLEND_OP_SOURCE;
1030  }
1031 
1032  s->cur_w = cur_w;
1033  s->cur_h = cur_h;
1034  s->x_offset = x_offset;
1035  s->y_offset = y_offset;
1036  s->dispose_op = dispose_op;
1037  s->blend_op = blend_op;
1038 
1039  return 0;
1040 }
1041 
1043 {
1044  int i, j;
1045  uint8_t *pd = p->data[0];
1046  uint8_t *pd_last = s->last_picture.f->data[0];
1047  int ls = av_image_get_linesize(p->format, s->width, 0);
1048 
1049  ls = FFMIN(ls, s->width * s->bpp);
1050 
1051  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1052  for (j = 0; j < s->height; j++) {
1053  for (i = 0; i < ls; i++)
1054  pd[i] += pd_last[i];
1055  pd += p->linesize[0];
1056  pd_last += s->last_picture.f->linesize[0];
1057  }
1058 }
1059 
1060 // divide by 255 and round to nearest
1061 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1062 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1063 
1065  AVFrame *p)
1066 {
1067  uint8_t *dst = p->data[0];
1068  ptrdiff_t dst_stride = p->linesize[0];
1069  const uint8_t *src = s->last_picture.f->data[0];
1070  ptrdiff_t src_stride = s->last_picture.f->linesize[0];
1071 
1072  size_t x, y;
1073 
1074  if (s->blend_op == APNG_BLEND_OP_OVER &&
1075  avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1076  avctx->pix_fmt != AV_PIX_FMT_GRAY8A &&
1077  avctx->pix_fmt != AV_PIX_FMT_PAL8) {
1078  avpriv_request_sample(avctx, "Blending with pixel format %s",
1079  av_get_pix_fmt_name(avctx->pix_fmt));
1080  return AVERROR_PATCHWELCOME;
1081  }
1082 
1083  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1084 
1085  // need to reset a rectangle to background:
1086  if (s->last_dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
1087  av_fast_malloc(&s->background_buf, &s->background_buf_allocated,
1088  src_stride * p->height);
1089  if (!s->background_buf)
1090  return AVERROR(ENOMEM);
1091 
1092  memcpy(s->background_buf, src, src_stride * p->height);
1093 
1094  for (y = s->last_y_offset; y < s->last_y_offset + s->last_h; y++) {
1095  memset(s->background_buf + src_stride * y +
1096  s->bpp * s->last_x_offset, 0, s->bpp * s->last_w);
1097  }
1098 
1099  src = s->background_buf;
1100  }
1101 
1102  // copy unchanged rectangles from the last frame
1103  for (y = 0; y < s->y_offset; y++)
1104  memcpy(dst + y * dst_stride, src + y * src_stride, p->width * s->bpp);
1105  for (y = s->y_offset; y < s->y_offset + s->cur_h; y++) {
1106  memcpy(dst + y * dst_stride, src + y * src_stride, s->x_offset * s->bpp);
1107  memcpy(dst + y * dst_stride + (s->x_offset + s->cur_w) * s->bpp,
1108  src + y * src_stride + (s->x_offset + s->cur_w) * s->bpp,
1109  (p->width - s->cur_w - s->x_offset) * s->bpp);
1110  }
1111  for (y = s->y_offset + s->cur_h; y < p->height; y++)
1112  memcpy(dst + y * dst_stride, src + y * src_stride, p->width * s->bpp);
1113 
1114  if (s->blend_op == APNG_BLEND_OP_OVER) {
1115  // Perform blending
1116  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1117  uint8_t *foreground = dst + dst_stride * y + s->bpp * s->x_offset;
1118  const uint8_t *background = src + src_stride * y + s->bpp * s->x_offset;
1119  for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += s->bpp, background += s->bpp) {
1120  size_t b;
1121  uint8_t foreground_alpha, background_alpha, output_alpha;
1122  uint8_t output[10];
1123 
1124  // Since we might be blending alpha onto alpha, we use the following equations:
1125  // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1126  // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1127 
1128  switch (avctx->pix_fmt) {
1129  case AV_PIX_FMT_RGBA:
1130  foreground_alpha = foreground[3];
1131  background_alpha = background[3];
1132  break;
1133 
1134  case AV_PIX_FMT_GRAY8A:
1135  foreground_alpha = foreground[1];
1136  background_alpha = background[1];
1137  break;
1138 
1139  case AV_PIX_FMT_PAL8:
1140  foreground_alpha = s->palette[foreground[0]] >> 24;
1141  background_alpha = s->palette[background[0]] >> 24;
1142  break;
1143  }
1144 
1145  if (foreground_alpha == 255)
1146  continue;
1147 
1148  if (foreground_alpha == 0) {
1149  memcpy(foreground, background, s->bpp);
1150  continue;
1151  }
1152 
1153  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1154  // TODO: Alpha blending with PAL8 will likely need the entire image converted over to RGBA first
1155  avpriv_request_sample(avctx, "Alpha blending palette samples");
1156  continue;
1157  }
1158 
1159  output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1160 
1161  av_assert0(s->bpp <= 10);
1162 
1163  for (b = 0; b < s->bpp - 1; ++b) {
1164  if (output_alpha == 0) {
1165  output[b] = 0;
1166  } else if (background_alpha == 255) {
1167  output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1168  } else {
1169  output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1170  }
1171  }
1172  output[b] = output_alpha;
1173  memcpy(foreground, output, s->bpp);
1174  }
1175  }
1176  }
1177 
1178  return 0;
1179 }
1180 
1182  AVFrame *p, const AVPacket *avpkt)
1183 {
1184  const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1185  uint32_t tag, length;
1186  int decode_next_dat = 0;
1187  int i, ret;
1188 
1189  for (;;) {
1190  GetByteContext gb_chunk;
1191 
1192  length = bytestream2_get_bytes_left(&s->gb);
1193  if (length <= 0) {
1194 
1195  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1196  avctx->skip_frame == AVDISCARD_ALL) {
1197  return 0;
1198  }
1199 
1200  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1201  if (!(s->pic_state & PNG_IDAT))
1202  return 0;
1203  else
1204  goto exit_loop;
1205  }
1206  av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1207  if ( s->pic_state & PNG_ALLIMAGE
1209  goto exit_loop;
1211  goto fail;
1212  }
1213 
1214  length = bytestream2_get_be32(&s->gb);
1215  if (length > 0x7fffffff || length + 8 > bytestream2_get_bytes_left(&s->gb)) {
1216  av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1218  goto fail;
1219  }
1220  if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1221  uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1222  uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1223  if (crc_sig ^ crc_cal) {
1224  av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1225  if (avctx->err_recognition & AV_EF_EXPLODE) {
1226  av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1228  goto fail;
1229  }
1230  av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1231  bytestream2_skip(&s->gb, length + 8); /* tag */
1232  }
1233  }
1234  tag = bytestream2_get_le32(&s->gb);
1235  if (avctx->debug & FF_DEBUG_STARTCODE)
1236  av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1237  av_fourcc2str(tag), length);
1238 
1239  bytestream2_init(&gb_chunk, s->gb.buffer, length);
1240  bytestream2_skip(&s->gb, length + 4);
1241 
1242  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1243  avctx->skip_frame == AVDISCARD_ALL) {
1244  switch(tag) {
1245  case MKTAG('I', 'H', 'D', 'R'):
1246  case MKTAG('p', 'H', 'Y', 's'):
1247  case MKTAG('t', 'E', 'X', 't'):
1248  case MKTAG('I', 'D', 'A', 'T'):
1249  case MKTAG('t', 'R', 'N', 'S'):
1250  break;
1251  default:
1252  continue;
1253  }
1254  }
1255 
1256  switch (tag) {
1257  case MKTAG('I', 'H', 'D', 'R'):
1258  if ((ret = decode_ihdr_chunk(avctx, s, &gb_chunk)) < 0)
1259  goto fail;
1260  break;
1261  case MKTAG('p', 'H', 'Y', 's'):
1262  if ((ret = decode_phys_chunk(avctx, s, &gb_chunk)) < 0)
1263  goto fail;
1264  break;
1265  case MKTAG('f', 'c', 'T', 'L'):
1266  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1267  continue;
1268  if ((ret = decode_fctl_chunk(avctx, s, &gb_chunk)) < 0)
1269  goto fail;
1270  decode_next_dat = 1;
1271  break;
1272  case MKTAG('f', 'd', 'A', 'T'):
1273  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1274  continue;
1275  if (!decode_next_dat || bytestream2_get_bytes_left(&gb_chunk) < 4) {
1277  goto fail;
1278  }
1279  bytestream2_get_be32(&gb_chunk);
1280  /* fallthrough */
1281  case MKTAG('I', 'D', 'A', 'T'):
1282  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1283  continue;
1284  if ((ret = decode_idat_chunk(avctx, s, &gb_chunk, p)) < 0)
1285  goto fail;
1286  break;
1287  case MKTAG('P', 'L', 'T', 'E'):
1288  decode_plte_chunk(avctx, s, &gb_chunk);
1289  break;
1290  case MKTAG('t', 'R', 'N', 'S'):
1291  decode_trns_chunk(avctx, s, &gb_chunk);
1292  break;
1293  case MKTAG('t', 'E', 'X', 't'):
1294  if (decode_text_chunk(s, &gb_chunk, 0) < 0)
1295  av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1296  break;
1297  case MKTAG('z', 'T', 'X', 't'):
1298  if (decode_text_chunk(s, &gb_chunk, 1) < 0)
1299  av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1300  break;
1301  case MKTAG('s', 'T', 'E', 'R'): {
1302  int mode = bytestream2_get_byte(&gb_chunk);
1303 
1304  if (mode == 0 || mode == 1) {
1305  s->stereo_mode = mode;
1306  } else {
1307  av_log(avctx, AV_LOG_WARNING,
1308  "Unknown value in sTER chunk (%d)\n", mode);
1309  }
1310  break;
1311  }
1312  case MKTAG('i', 'C', 'C', 'P'): {
1313  if ((ret = decode_iccp_chunk(s, &gb_chunk, p)) < 0)
1314  goto fail;
1315  break;
1316  }
1317  case MKTAG('c', 'H', 'R', 'M'): {
1318  s->have_chrm = 1;
1319 
1320  s->white_point[0] = bytestream2_get_be32(&gb_chunk);
1321  s->white_point[1] = bytestream2_get_be32(&gb_chunk);
1322 
1323  /* RGB Primaries */
1324  for (i = 0; i < 3; i++) {
1325  s->display_primaries[i][0] = bytestream2_get_be32(&gb_chunk);
1326  s->display_primaries[i][1] = bytestream2_get_be32(&gb_chunk);
1327  }
1328 
1329  break;
1330  }
1331  case MKTAG('g', 'A', 'M', 'A'): {
1332  AVBPrint bp;
1333  char *gamma_str;
1334  int num = bytestream2_get_be32(&gb_chunk);
1335 
1337  av_bprintf(&bp, "%i/%i", num, 100000);
1338  ret = av_bprint_finalize(&bp, &gamma_str);
1339  if (ret < 0)
1340  return ret;
1341 
1342  av_dict_set(&s->frame_metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1343 
1344  break;
1345  }
1346  case MKTAG('I', 'E', 'N', 'D'):
1347  if (!(s->pic_state & PNG_ALLIMAGE))
1348  av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1349  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1351  goto fail;
1352  }
1353  goto exit_loop;
1354  }
1355  }
1356 exit_loop:
1357 
1358  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1359  avctx->skip_frame == AVDISCARD_ALL) {
1360  return 0;
1361  }
1362 
1364  return AVERROR_INVALIDDATA;
1365 
1366  if (s->bits_per_pixel <= 4)
1367  handle_small_bpp(s, p);
1368 
1369  /* apply transparency if needed */
1370  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1371  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1372  size_t raw_bpp = s->bpp - byte_depth;
1373  unsigned x, y;
1374 
1375  av_assert0(s->bit_depth > 1);
1376 
1377  for (y = 0; y < s->height; ++y) {
1378  uint8_t *row = &p->data[0][p->linesize[0] * y];
1379 
1380  if (s->bpp == 2 && byte_depth == 1) {
1381  uint8_t *pixel = &row[2 * s->width - 1];
1382  uint8_t *rowp = &row[1 * s->width - 1];
1383  int tcolor = s->transparent_color_be[0];
1384  for (x = s->width; x > 0; --x) {
1385  *pixel-- = *rowp == tcolor ? 0 : 0xff;
1386  *pixel-- = *rowp--;
1387  }
1388  } else if (s->bpp == 4 && byte_depth == 1) {
1389  uint8_t *pixel = &row[4 * s->width - 1];
1390  uint8_t *rowp = &row[3 * s->width - 1];
1391  int tcolor = AV_RL24(s->transparent_color_be);
1392  for (x = s->width; x > 0; --x) {
1393  *pixel-- = AV_RL24(rowp-2) == tcolor ? 0 : 0xff;
1394  *pixel-- = *rowp--;
1395  *pixel-- = *rowp--;
1396  *pixel-- = *rowp--;
1397  }
1398  } else {
1399  /* since we're updating in-place, we have to go from right to left */
1400  for (x = s->width; x > 0; --x) {
1401  uint8_t *pixel = &row[s->bpp * (x - 1)];
1402  memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1403 
1404  if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1405  memset(&pixel[raw_bpp], 0, byte_depth);
1406  } else {
1407  memset(&pixel[raw_bpp], 0xff, byte_depth);
1408  }
1409  }
1410  }
1411  }
1412  }
1413 
1414  /* handle P-frames only if a predecessor frame is available */
1415  if (s->last_picture.f->data[0]) {
1416  if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1417  && s->last_picture.f->width == p->width
1418  && s->last_picture.f->height== p->height
1419  && s->last_picture.f->format== p->format
1420  ) {
1421  if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1422  handle_p_frame_png(s, p);
1423  else if (CONFIG_APNG_DECODER &&
1424  avctx->codec_id == AV_CODEC_ID_APNG &&
1425  (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1426  goto fail;
1427  }
1428  }
1429  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1430 
1431  return 0;
1432 
1433 fail:
1434  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1435  return ret;
1436 }
1437 
1439 {
1440  av_freep(&s->iccp_data);
1441  s->iccp_data_len = 0;
1442  s->iccp_name[0] = 0;
1443 
1444  s->stereo_mode = -1;
1445 
1446  s->have_chrm = 0;
1447 
1448  av_dict_free(&s->frame_metadata);
1449 }
1450 
1452  const AVFrame *src)
1453 {
1454  int ret;
1455 
1456  ret = av_frame_ref(f, src);
1457  if (ret < 0)
1458  return ret;
1459 
1460  if (s->iccp_data) {
1462  if (!sd) {
1463  ret = AVERROR(ENOMEM);
1464  goto fail;
1465  }
1466  memcpy(sd->data, s->iccp_data, s->iccp_data_len);
1467 
1468  av_dict_set(&sd->metadata, "name", s->iccp_name, 0);
1469  }
1470 
1471  if (s->stereo_mode >= 0) {
1473  if (!stereo3d) {
1474  ret = AVERROR(ENOMEM);
1475  goto fail;
1476  }
1477 
1478  stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1479  stereo3d->flags = s->stereo_mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1480  }
1481 
1482  if (s->have_chrm) {
1484  if (!mdm) {
1485  ret = AVERROR(ENOMEM);
1486  goto fail;
1487  }
1488 
1489  mdm->white_point[0] = av_make_q(s->white_point[0], 100000);
1490  mdm->white_point[1] = av_make_q(s->white_point[1], 100000);
1491 
1492  /* RGB Primaries */
1493  for (int i = 0; i < 3; i++) {
1494  mdm->display_primaries[i][0] = av_make_q(s->display_primaries[i][0], 100000);
1495  mdm->display_primaries[i][1] = av_make_q(s->display_primaries[i][1], 100000);
1496  }
1497 
1498  mdm->has_primaries = 1;
1499  }
1500 
1501  FFSWAP(AVDictionary*, f->metadata, s->frame_metadata);
1502 
1503  return 0;
1504 fail:
1505  av_frame_unref(f);
1506  return ret;
1507 }
1508 
1509 #if CONFIG_PNG_DECODER
1510 static int decode_frame_png(AVCodecContext *avctx,
1511  void *data, int *got_frame,
1512  AVPacket *avpkt)
1513 {
1514  PNGDecContext *const s = avctx->priv_data;
1515  const uint8_t *buf = avpkt->data;
1516  int buf_size = avpkt->size;
1517  AVFrame *dst_frame = data;
1518  AVFrame *p = s->picture.f;
1519  int64_t sig;
1520  int ret;
1521 
1523 
1524  bytestream2_init(&s->gb, buf, buf_size);
1525 
1526  /* check signature */
1527  sig = bytestream2_get_be64(&s->gb);
1528  if (sig != PNGSIG &&
1529  sig != MNGSIG) {
1530  av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1531  return AVERROR_INVALIDDATA;
1532  }
1533 
1534  s->y = s->has_trns = 0;
1535  s->hdr_state = 0;
1536  s->pic_state = 0;
1537 
1538  /* init the zlib */
1539  s->zstream.zalloc = ff_png_zalloc;
1540  s->zstream.zfree = ff_png_zfree;
1541  s->zstream.opaque = NULL;
1542  ret = inflateInit(&s->zstream);
1543  if (ret != Z_OK) {
1544  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1545  return AVERROR_EXTERNAL;
1546  }
1547 
1548  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1549  goto the_end;
1550 
1551  if (avctx->skip_frame == AVDISCARD_ALL) {
1552  *got_frame = 0;
1553  ret = bytestream2_tell(&s->gb);
1554  goto the_end;
1555  }
1556 
1557  ret = output_frame(s, dst_frame, s->picture.f);
1558  if (ret < 0)
1559  goto the_end;
1560 
1561  if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1562  ff_thread_release_buffer(avctx, &s->last_picture);
1563  FFSWAP(ThreadFrame, s->picture, s->last_picture);
1564  }
1565 
1566  *got_frame = 1;
1567 
1568  ret = bytestream2_tell(&s->gb);
1569 the_end:
1570  inflateEnd(&s->zstream);
1571  s->crow_buf = NULL;
1572  return ret;
1573 }
1574 #endif
1575 
1576 #if CONFIG_APNG_DECODER
1577 static int decode_frame_apng(AVCodecContext *avctx,
1578  void *data, int *got_frame,
1579  AVPacket *avpkt)
1580 {
1581  PNGDecContext *const s = avctx->priv_data;
1582  AVFrame *dst_frame = data;
1583  int ret;
1584  AVFrame *p = s->picture.f;
1585 
1587 
1588  if (!(s->hdr_state & PNG_IHDR)) {
1589  if (!avctx->extradata_size)
1590  return AVERROR_INVALIDDATA;
1591 
1592  /* only init fields, there is no zlib use in extradata */
1593  s->zstream.zalloc = ff_png_zalloc;
1594  s->zstream.zfree = ff_png_zfree;
1595 
1596  bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1597  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1598  goto end;
1599  }
1600 
1601  /* reset state for a new frame */
1602  if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1603  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1605  goto end;
1606  }
1607  s->y = 0;
1608  s->pic_state = 0;
1609  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1610  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1611  goto end;
1612 
1613  if (!(s->pic_state & PNG_ALLIMAGE))
1614  av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1615  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1617  goto end;
1618  }
1619 
1620  ret = output_frame(s, dst_frame, s->picture.f);
1621  if (ret < 0)
1622  goto end;
1623 
1624  if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1625  if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1626  ff_thread_release_buffer(avctx, &s->picture);
1627  } else {
1628  ff_thread_release_buffer(avctx, &s->last_picture);
1629  FFSWAP(ThreadFrame, s->picture, s->last_picture);
1630  }
1631  }
1632 
1633  *got_frame = 1;
1634  ret = bytestream2_tell(&s->gb);
1635 
1636 end:
1637  inflateEnd(&s->zstream);
1638  return ret;
1639 }
1640 #endif
1641 
1642 #if HAVE_THREADS
1643 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1644 {
1645  PNGDecContext *psrc = src->priv_data;
1646  PNGDecContext *pdst = dst->priv_data;
1647  ThreadFrame *src_frame = NULL;
1648  int ret;
1649 
1650  if (dst == src)
1651  return 0;
1652 
1653  if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1654 
1655  pdst->width = psrc->width;
1656  pdst->height = psrc->height;
1657  pdst->bit_depth = psrc->bit_depth;
1658  pdst->color_type = psrc->color_type;
1659  pdst->compression_type = psrc->compression_type;
1660  pdst->interlace_type = psrc->interlace_type;
1661  pdst->filter_type = psrc->filter_type;
1662  pdst->cur_w = psrc->cur_w;
1663  pdst->cur_h = psrc->cur_h;
1664  pdst->x_offset = psrc->x_offset;
1665  pdst->y_offset = psrc->y_offset;
1666  pdst->has_trns = psrc->has_trns;
1667  memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1668 
1669  pdst->dispose_op = psrc->dispose_op;
1670 
1671  memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1672 
1673  pdst->hdr_state |= psrc->hdr_state;
1674  }
1675 
1676  src_frame = psrc->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
1677  &psrc->last_picture : &psrc->picture;
1678 
1680  if (src_frame && src_frame->f->data[0]) {
1681  ret = ff_thread_ref_frame(&pdst->last_picture, src_frame);
1682  if (ret < 0)
1683  return ret;
1684  }
1685 
1686  return 0;
1687 }
1688 #endif
1689 
1691 {
1692  PNGDecContext *s = avctx->priv_data;
1693 
1694  avctx->color_range = AVCOL_RANGE_JPEG;
1695 
1696  s->avctx = avctx;
1697  s->last_picture.f = av_frame_alloc();
1698  s->picture.f = av_frame_alloc();
1699  if (!s->last_picture.f || !s->picture.f) {
1700  av_frame_free(&s->last_picture.f);
1701  av_frame_free(&s->picture.f);
1702  return AVERROR(ENOMEM);
1703  }
1704 
1705  ff_pngdsp_init(&s->dsp);
1706 
1707  return 0;
1708 }
1709 
1711 {
1712  PNGDecContext *s = avctx->priv_data;
1713 
1714  ff_thread_release_buffer(avctx, &s->last_picture);
1715  av_frame_free(&s->last_picture.f);
1716  ff_thread_release_buffer(avctx, &s->picture);
1717  av_frame_free(&s->picture.f);
1718  av_freep(&s->buffer);
1719  s->buffer_size = 0;
1720  av_freep(&s->last_row);
1721  s->last_row_size = 0;
1722  av_freep(&s->tmp_row);
1723  s->tmp_row_size = 0;
1724  av_freep(&s->background_buf);
1725 
1726  av_freep(&s->iccp_data);
1727  av_dict_free(&s->frame_metadata);
1728 
1729  return 0;
1730 }
1731 
1732 #if CONFIG_APNG_DECODER
1733 const AVCodec ff_apng_decoder = {
1734  .name = "apng",
1735  .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1736  .type = AVMEDIA_TYPE_VIDEO,
1737  .id = AV_CODEC_ID_APNG,
1738  .priv_data_size = sizeof(PNGDecContext),
1739  .init = png_dec_init,
1740  .close = png_dec_end,
1741  .decode = decode_frame_apng,
1743  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1744  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
1746 };
1747 #endif
1748 
1749 #if CONFIG_PNG_DECODER
1750 const AVCodec ff_png_decoder = {
1751  .name = "png",
1752  .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1753  .type = AVMEDIA_TYPE_VIDEO,
1754  .id = AV_CODEC_ID_PNG,
1755  .priv_data_size = sizeof(PNGDecContext),
1756  .init = png_dec_init,
1757  .close = png_dec_end,
1758  .decode = decode_frame_png,
1760  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1763 };
1764 #endif
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:31
PNG_PLTE
@ PNG_PLTE
Definition: pngdec.c:44
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
AVCodec
AVCodec.
Definition: codec.h:202
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
PNGDecContext::last_h
int last_h
Definition: pngdec.c:76
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
clear_frame_metadata
static void clear_frame_metadata(PNGDecContext *s)
Definition: pngdec.c:1438
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:198
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
r
const char * r
Definition: vf_curves.c:116
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:133
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:234
ff_thread_ref_frame
int ff_thread_ref_frame(ThreadFrame *dst, const ThreadFrame *src)
Definition: utils.c:884
out
FILE * out
Definition: movenc.c:54
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:68
av_frame_new_side_data
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, size_t size)
Add a new side data to a frame.
Definition: frame.c:605
GetByteContext
Definition: bytestream.h:33
PNG_ALLIMAGE
@ PNG_ALLIMAGE
Definition: pngdec.c:49
AVCRC
uint32_t AVCRC
Definition: crc.h:46
PNGDecContext::last_row_size
unsigned int last_row_size
Definition: pngdec.c:97
decode_phys_chunk
static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:622
PNGDecContext::bit_depth
int bit_depth
Definition: pngdec.c:81
ff_png_get_nb_channels
int ff_png_get_nb_channels(int color_type)
Definition: png.c:51
APNG_DISPOSE_OP_BACKGROUND
@ APNG_DISPOSE_OP_BACKGROUND
Definition: apng.h:32
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
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1324
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:103
av_mod_uintp2
#define av_mod_uintp2
Definition: common.h:123
decode_text_chunk
static int decode_text_chunk(PNGDecContext *s, GetByteContext *gb, int compressed)
Definition: pngdec.c:524
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
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:195
AVFrame::width
int width
Definition: frame.h:361
w
uint8_t w
Definition: llviddspenc.c:38
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:579
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
decode_zbuf
static int decode_zbuf(AVBPrint *bp, const uint8_t *data, const uint8_t *data_end)
Definition: pngdec.c:456
b
#define b
Definition: input.c:40
PNGDecContext::last_y_offset
int last_y_offset
Definition: pngdec.c:78
data
const char data[16]
Definition: mxf.c:143
output_frame
static int output_frame(PNGDecContext *s, AVFrame *f, const AVFrame *src)
Definition: pngdec.c:1451
PNGDecContext::row_size
int row_size
Definition: pngdec.c:104
iso88591_to_utf8
static uint8_t * iso88591_to_utf8(const uint8_t *in, size_t size_in)
Definition: pngdec.c:500
PNGDecContext::width
int width
Definition: pngdec.c:74
AVDictionary
Definition: dict.c:30
PNGDecContext::background_buf
uint8_t * background_buf
Definition: pngdec.c:92
AV_CODEC_ID_APNG
@ AV_CODEC_ID_APNG
Definition: codec_id.h:264
PNGDecContext::tmp_row_size
unsigned int tmp_row_size
Definition: pngdec.c:99
PNGDecContext::color_type
int color_type
Definition: pngdec.c:82
PNGDecContext::cur_h
int cur_h
Definition: pngdec.c:75
ff_png_zfree
void ff_png_zfree(void *opaque, void *ptr)
Definition: png.c:46
PNGDecContext::bits_per_pixel
int bits_per_pixel
Definition: pngdec.c:87
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
thread.h
ff_thread_await_progress
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_thread_await_progress() 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_thread_report_progress() has been called on them. This includes draw_edges(). Porting codecs to frame threading
ThreadFrame::f
AVFrame * f
Definition: thread.h:35
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1303
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
NB_PASSES
#define NB_PASSES
Definition: png.h:47
PNGDecContext::blend_op
uint8_t blend_op
Definition: pngdec.c:79
crc.h
AV_PIX_FMT_GRAY16BE
@ AV_PIX_FMT_GRAY16BE
Y , 16bpp, big-endian.
Definition: pixfmt.h:97
AV_STEREO3D_SIDEBYSIDE
@ AV_STEREO3D_SIDEBYSIDE
Views are next to each other.
Definition: stereo3d.h:67
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
PNGDecContext::zstream
z_stream zstream
Definition: pngdec.c:107
FAST_DIV255
#define FAST_DIV255(x)
Definition: pngdec.c:1062
PNGImageState
PNGImageState
Definition: pngdec.c:47
PNG_FILTER_TYPE_LOCO
#define PNG_FILTER_TYPE_LOCO
Definition: png.h:39
U
#define U(x)
Definition: vp56_arith.h:37
PNGDecContext::pass_row_size
int pass_row_size
Definition: pngdec.c:105
ff_png_pass_row_size
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
Definition: png.c:64
AVCodecContext::skip_frame
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1673
fail
#define fail()
Definition: checkasm.h:127
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:198
ff_thread_get_buffer
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 so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames. The frames must then be freed with ff_thread_release_buffer(). Otherwise decode directly into the user-supplied frames. Call ff_thread_report_progress() 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
png_dec_end
static av_cold int png_dec_end(AVCodecContext *avctx)
Definition: pngdec.c:1710
OP_AVG
#define OP_AVG(x, s, l)
PNGDecContext::pic_state
enum PNGImageState pic_state
Definition: pngdec.c:73
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:381
decode_idat_chunk
static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb, AVFrame *p)
Definition: pngdec.c:638
png_pass_dsp_ymask
static const uint8_t png_pass_dsp_ymask[NB_PASSES]
Definition: pngdec.c:116
AVRational::num
int num
Numerator.
Definition: rational.h:59
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:95
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:72
PNGDecContext::last_row
uint8_t * last_row
Definition: pngdec.c: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: internal.h:62
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:99
PNGDecContext::height
int height
Definition: pngdec.c:74
avassert.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
pngdsp.h
av_cold
#define av_cold
Definition: attributes.h:90
ff_thread_report_progress
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
Notify later decoding threads when part of their reference picture is ready.
Definition: pthread_frame.c:588
YUV2RGB
#define YUV2RGB(NAME, TYPE)
Definition: pngdec.c:321
mask
static const uint16_t mask[17]
Definition: lzw.c:38
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:485
width
#define width
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:98
s
#define s(width, name)
Definition: cbs_vp9.c:257
PNGDecContext::y_offset
int y_offset
Definition: pngdec.c:77
PNGDecContext::palette
uint32_t palette[256]
Definition: pngdec.c:94
g
const char * g
Definition: vf_curves.c:117
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:361
GetByteContext::buffer
const uint8_t * buffer
Definition: bytestream.h:34
PNG_COLOR_TYPE_RGB
#define PNG_COLOR_TYPE_RGB
Definition: png.h:35
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
PNGDecContext::hdr_state
enum PNGHeaderState hdr_state
Definition: pngdec.c:72
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:63
percent_missing
static int percent_missing(PNGDecContext *s)
Definition: pngdec.c:335
APNG_DISPOSE_OP_PREVIOUS
@ APNG_DISPOSE_OP_PREVIOUS
Definition: apng.h:33
f
#define f(width, name)
Definition: cbs_vp9.c:255
pass
#define pass
Definition: fft_template.c:601
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:393
AVStereo3D::flags
int flags
Additional information about the frame packing.
Definition: stereo3d.h:185
AV_CODEC_ID_PNG
@ AV_CODEC_ID_PNG
Definition: codec_id.h:111
if
if(ret)
Definition: filter_design.txt:179
PNGDecContext
Definition: pngdec.c:52
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:113
AVDISCARD_ALL
@ AVDISCARD_ALL
discard all
Definition: defs.h:54
AV_PIX_FMT_GRAY8A
@ AV_PIX_FMT_GRAY8A
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:136
NULL
#define NULL
Definition: coverity.c:32
PNGDecContext::filter_type
int filter_type
Definition: pngdec.c:85
png_decode_idat
static int png_decode_idat(PNGDecContext *s, GetByteContext *gb, uint8_t *dst, ptrdiff_t dst_stride)
Definition: pngdec.c:426
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:1690
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:967
apng.h
pixel
uint8_t pixel
Definition: tiny_ssim.c:42
AV_WB16
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
PNGDecContext::background_buf_allocated
unsigned background_buf_allocated
Definition: pngdec.c:93
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:76
PNGDecContext::channels
int channels
Definition: pngdec.c:86
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
src
#define src
Definition: vp8dsp.c:255
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:143
PNG_COLOR_TYPE_GRAY
#define PNG_COLOR_TYPE_GRAY
Definition: png.h:33
ONLY_IF_THREADS_ENABLED
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:156
abs
#define abs(x)
Definition: cuda_runtime.h:35
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1335
ff_apng_decoder
const AVCodec ff_apng_decoder
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
png_pass_mask
static const uint8_t png_pass_mask[NB_PASSES]
Definition: pngdec.c:111
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:102
ff_thread_release_buffer
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
Definition: pthread_frame.c:1057
PNGDecContext::iccp_name
uint8_t iccp_name[82]
Definition: pngdec.c:62
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
handle_small_bpp
static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:891
PNG_FILTER_VALUE_NONE
#define PNG_FILTER_VALUE_NONE
Definition: png.h:40
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:386
AV_PIX_FMT_RGB24
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
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
AV_EF_IGNORE_ERR
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:1337
PNGDecContext::gb
GetByteContext gb
Definition: pngdec.c:56
AVPacket::size
int size
Definition: packet.h:374
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:217
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
handle_p_frame_png
static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1042
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:327
PNGDecContext::white_point
uint32_t white_point[2]
Definition: pngdec.c:69
PNGDecContext::last_w
int last_w
Definition: pngdec.c:76
PNGDecContext::picture
ThreadFrame picture
Definition: pngdec.c:58
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:128
AV_PIX_FMT_YA16BE
@ AV_PIX_FMT_YA16BE
16 bits gray, 16 bits alpha (big-endian)
Definition: pixfmt.h:202
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
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
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:211
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:376
PNGDecContext::buffer
uint8_t * buffer
Definition: pngdec.c:100
PNG_FILTER_VALUE_UP
#define PNG_FILTER_VALUE_UP
Definition: png.h:42
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:79
ff_png_decoder
const AVCodec ff_png_decoder
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:379
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:203
decode_trns_chunk
static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:810
AV_STEREO3D_FLAG_INVERT
#define AV_STEREO3D_FLAG_INVERT
Inverted views, Right/Bottom represents the left view.
Definition: stereo3d.h:167
FF_COMPLIANCE_NORMAL
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:1283
PNGSIG
#define PNGSIG
Definition: png.h:49
PNGDecContext::last_x_offset
int last_x_offset
Definition: pngdec.c:78
PNGDecContext::buffer_size
int buffer_size
Definition: pngdec.c:101
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1451
PNGDecContext::stereo_mode
int stereo_mode
Definition: pngdec.c:66
ff_pngdsp_init
av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
Definition: pngdsp.c:43
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:60
AVFrame::interlaced_frame
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:433
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:102
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:484
PNGDecContext::x_offset
int x_offset
Definition: pngdec.c:77
PNGDecContext::display_primaries
uint32_t display_primaries[3][2]
Definition: pngdec.c:70
png_handle_row
static void png_handle_row(PNGDecContext *s, uint8_t *dst, ptrdiff_t dst_stride)
Definition: pngdec.c:345
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:50
FF_DEBUG_STARTCODE
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1310
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
decode_iccp_chunk
static int decode_iccp_chunk(PNGDecContext *s, GetByteContext *gb, AVFrame *f)
Definition: pngdec.c:858
decode_fctl_chunk
static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:964
decode_plte_chunk
static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:787
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:437
ff_png_zalloc
void * ff_png_zalloc(void *opaque, unsigned int items, unsigned int size)
Definition: png.c:41
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
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. If there are inter-frame dependencies
AVMasteringDisplayMetadata
Mastering display metadata capable of representing the color volume of the display used to master the...
Definition: mastering_display_metadata.h:38
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:593
PNGDecContext::avctx
AVCodecContext * avctx
Definition: pngdec.c:54
avcodec.h
PNGHeaderState
PNGHeaderState
Definition: pngdec.c:42
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
tag
uint32_t tag
Definition: movenc.c:1595
ret
ret
Definition: filter_design.txt:187
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
PNGDecContext::iccp_data_len
size_t iccp_data_len
Definition: pngdec.c:64
AVCodecContext::strict_std_compliance
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1280
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: avcodec.h:1332
AVStereo3D::type
enum AVStereo3DType type
How views are packed within the video.
Definition: stereo3d.h:180
PNGDecContext::last_picture
ThreadFrame last_picture
Definition: pngdec.c:57
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:93
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:83
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
PNG_IHDR
@ PNG_IHDR
Definition: pngdec.c:43
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:264
AVCodecContext
main external API structure.
Definition: avcodec.h:383
AVFrame::height
int height
Definition: frame.h:361
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1459
PNGDecContext::last_dispose_op
uint8_t last_dispose_op
Definition: pngdec.c:80
ThreadFrame
Definition: thread.h:34
decode_frame_common
static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p, const AVPacket *avpkt)
Definition: pngdec.c:1181
av_mastering_display_metadata_create_side_data
AVMasteringDisplayMetadata * av_mastering_display_metadata_create_side_data(AVFrame *frame)
Allocate a complete AVMasteringDisplayMetadata and add it to the frame.
Definition: mastering_display_metadata.c:32
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:249
AVRational::den
int den
Denominator.
Definition: rational.h:60
mode
mode
Definition: ebur128.h:83
PNGDecContext::transparent_color_be
uint8_t transparent_color_be[6]
Definition: pngdec.c:90
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:63
PNGDecContext::have_chrm
int have_chrm
Definition: pngdec.c:68
png_pass_dsp_mask
static const uint8_t png_pass_dsp_mask[NB_PASSES]
Definition: pngdec.c:121
AVCodecContext::discard_damaged_percentage
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:1966
APNG_BLEND_OP_SOURCE
@ APNG_BLEND_OP_SOURCE
Definition: apng.h:37
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:1302
PNG_IDAT
@ PNG_IDAT
Definition: pngdec.c:48
AV_CRC_32_IEEE_LE
@ AV_CRC_32_IEEE_LE
Definition: crc.h:53
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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:86
mastering_display_metadata.h
FF_CODEC_CAP_ALLOCATE_PROGRESS
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: internal.h:77
decode_ihdr_chunk
static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, GetByteContext *gb)
Definition: pngdec.c:571
PNGDecContext::dsp
PNGDSPContext dsp
Definition: pngdec.c:53
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:33
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:209
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:408
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
AVPacket
This structure stores compressed data.
Definition: packet.h:350
png.h
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
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:70
av_fast_malloc
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:560
d
d
Definition: ffmpeg_filter.c:156
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, size in bytes of each picture line.
Definition: frame.h:334
PNG_COLOR_TYPE_GRAY_ALPHA
#define PNG_COLOR_TYPE_GRAY_ALPHA
Definition: png.h:37
AVFrameSideData::metadata
AVDictionary * metadata
Definition: frame.h:213
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MNGSIG
#define MNGSIG
Definition: png.h:50
PNGDecContext::interlace_type
int interlace_type
Definition: pngdec.c:84
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:176
handle_p_frame_apng
static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1064
PNGDecContext::y
int y
Definition: pngdec.c:106
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)
PNGDecContext::cur_w
int cur_w
Definition: pngdec.c:75
APNG_BLEND_OP_OVER
@ APNG_BLEND_OP_OVER
Definition: apng.h:38
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:753
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:70
PNGDecContext::bpp
int bpp
Definition: pngdec.c:88
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:2484
PNGDecContext::has_trns
int has_trns
Definition: pngdec.c:89
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:348