FFmpeg
pngdec.c
Go to the documentation of this file.
1 /*
2  * PNG image format
3  * Copyright (c) 2003 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 //#define DEBUG
23 
24 #include "libavutil/avassert.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/crc.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/stereo3d.h"
31 
32 #include "avcodec.h"
33 #include "bytestream.h"
34 #include "internal.h"
35 #include "apng.h"
36 #include "png.h"
37 #include "pngdsp.h"
38 #include "thread.h"
39 
40 #include <zlib.h>
41 
43  PNG_IHDR = 1 << 0,
44  PNG_PLTE = 1 << 1,
45 };
46 
48  PNG_IDAT = 1 << 0,
49  PNG_ALLIMAGE = 1 << 1,
50 };
51 
52 typedef struct PNGDecContext {
55 
60 
63  int width, height;
64  int cur_w, cur_h;
65  int last_w, last_h;
70  int bit_depth;
75  int channels;
77  int bpp;
78  int has_trns;
80 
83  uint32_t palette[256];
86  unsigned int last_row_size;
88  unsigned int tmp_row_size;
91  int pass;
92  int crow_size; /* compressed row size (include filter type) */
93  int row_size; /* decompressed row size */
94  int pass_row_size; /* decompress row size of the current pass */
95  int y;
96  z_stream zstream;
98 
99 /* Mask to determine which pixels are valid in a pass */
100 static const uint8_t png_pass_mask[NB_PASSES] = {
101  0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
102 };
103 
104 /* Mask to determine which y pixels can be written in a pass */
106  0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
107 };
108 
109 /* Mask to determine which pixels to overwrite while displaying */
111  0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
112 };
113 
114 /* NOTE: we try to construct a good looking image at each pass. width
115  * is the original image width. We also do pixel format conversion at
116  * this stage */
117 static void png_put_interlaced_row(uint8_t *dst, int width,
118  int bits_per_pixel, int pass,
119  int color_type, const uint8_t *src)
120 {
121  int x, mask, dsp_mask, j, src_x, b, bpp;
122  uint8_t *d;
123  const uint8_t *s;
124 
125  mask = png_pass_mask[pass];
126  dsp_mask = png_pass_dsp_mask[pass];
127 
128  switch (bits_per_pixel) {
129  case 1:
130  src_x = 0;
131  for (x = 0; x < width; x++) {
132  j = (x & 7);
133  if ((dsp_mask << j) & 0x80) {
134  b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
135  dst[x >> 3] &= 0xFF7F>>j;
136  dst[x >> 3] |= b << (7 - j);
137  }
138  if ((mask << j) & 0x80)
139  src_x++;
140  }
141  break;
142  case 2:
143  src_x = 0;
144  for (x = 0; x < width; x++) {
145  int j2 = 2 * (x & 3);
146  j = (x & 7);
147  if ((dsp_mask << j) & 0x80) {
148  b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
149  dst[x >> 2] &= 0xFF3F>>j2;
150  dst[x >> 2] |= b << (6 - j2);
151  }
152  if ((mask << j) & 0x80)
153  src_x++;
154  }
155  break;
156  case 4:
157  src_x = 0;
158  for (x = 0; x < width; x++) {
159  int j2 = 4*(x&1);
160  j = (x & 7);
161  if ((dsp_mask << j) & 0x80) {
162  b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
163  dst[x >> 1] &= 0xFF0F>>j2;
164  dst[x >> 1] |= b << (4 - j2);
165  }
166  if ((mask << j) & 0x80)
167  src_x++;
168  }
169  break;
170  default:
171  bpp = bits_per_pixel >> 3;
172  d = dst;
173  s = src;
174  for (x = 0; x < width; x++) {
175  j = x & 7;
176  if ((dsp_mask << j) & 0x80) {
177  memcpy(d, s, bpp);
178  }
179  d += bpp;
180  if ((mask << j) & 0x80)
181  s += bpp;
182  }
183  break;
184  }
185 }
186 
188  int w, int bpp)
189 {
190  int i;
191  for (i = 0; i < w; i++) {
192  int a, b, c, p, pa, pb, pc;
193 
194  a = dst[i - bpp];
195  b = top[i];
196  c = top[i - bpp];
197 
198  p = b - c;
199  pc = a - c;
200 
201  pa = abs(p);
202  pb = abs(pc);
203  pc = abs(p + pc);
204 
205  if (pa <= pb && pa <= pc)
206  p = a;
207  else if (pb <= pc)
208  p = b;
209  else
210  p = c;
211  dst[i] = p + src[i];
212  }
213 }
214 
215 #define UNROLL1(bpp, op) \
216  { \
217  r = dst[0]; \
218  if (bpp >= 2) \
219  g = dst[1]; \
220  if (bpp >= 3) \
221  b = dst[2]; \
222  if (bpp >= 4) \
223  a = dst[3]; \
224  for (; i <= size - bpp; i += bpp) { \
225  dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
226  if (bpp == 1) \
227  continue; \
228  dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
229  if (bpp == 2) \
230  continue; \
231  dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
232  if (bpp == 3) \
233  continue; \
234  dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
235  } \
236  }
237 
238 #define UNROLL_FILTER(op) \
239  if (bpp == 1) { \
240  UNROLL1(1, op) \
241  } else if (bpp == 2) { \
242  UNROLL1(2, op) \
243  } else if (bpp == 3) { \
244  UNROLL1(3, op) \
245  } else if (bpp == 4) { \
246  UNROLL1(4, op) \
247  } \
248  for (; i < size; i++) { \
249  dst[i] = op(dst[i - bpp], src[i], last[i]); \
250  }
251 
252 /* NOTE: 'dst' can be equal to 'last' */
254  uint8_t *src, uint8_t *last, int size, int bpp)
255 {
256  int i, p, r, g, b, a;
257 
258  switch (filter_type) {
260  memcpy(dst, src, size);
261  break;
263  for (i = 0; i < bpp; i++)
264  dst[i] = src[i];
265  if (bpp == 4) {
266  p = *(int *)dst;
267  for (; i < size; i += bpp) {
268  unsigned s = *(int *)(src + i);
269  p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
270  *(int *)(dst + i) = p;
271  }
272  } else {
273 #define OP_SUB(x, s, l) ((x) + (s))
275  }
276  break;
277  case PNG_FILTER_VALUE_UP:
278  dsp->add_bytes_l2(dst, src, last, size);
279  break;
281  for (i = 0; i < bpp; i++) {
282  p = (last[i] >> 1);
283  dst[i] = p + src[i];
284  }
285 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
287  break;
289  for (i = 0; i < bpp; i++) {
290  p = last[i];
291  dst[i] = p + src[i];
292  }
293  if (bpp > 2 && size > 4) {
294  /* would write off the end of the array if we let it process
295  * the last pixel with bpp=3 */
296  int w = (bpp & 3) ? size - 3 : size;
297 
298  if (w > i) {
299  dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
300  i = w;
301  }
302  }
303  ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
304  break;
305  }
306 }
307 
308 /* This used to be called "deloco" in FFmpeg
309  * and is actually an inverse reversible colorspace transformation */
310 #define YUV2RGB(NAME, TYPE) \
311 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
312 { \
313  int i; \
314  for (i = 0; i < size; i += 3 + alpha) { \
315  int g = dst [i + 1]; \
316  dst[i + 0] += g; \
317  dst[i + 2] += g; \
318  } \
319 }
320 
321 YUV2RGB(rgb8, uint8_t)
322 YUV2RGB(rgb16, uint16_t)
323 
325 {
326  if (s->interlace_type) {
327  return 100 - 100 * s->pass / (NB_PASSES - 1);
328  } else {
329  return 100 - 100 * s->y / s->cur_h;
330  }
331 }
332 
333 /* process exactly one decompressed row */
335 {
336  uint8_t *ptr, *last_row;
337  int got_line;
338 
339  if (!s->interlace_type) {
340  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
341  if (s->y == 0)
342  last_row = s->last_row;
343  else
344  last_row = ptr - s->image_linesize;
345 
346  png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
347  last_row, s->row_size, s->bpp);
348  /* loco lags by 1 row so that it doesn't interfere with top prediction */
349  if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
350  if (s->bit_depth == 16) {
351  deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2,
353  } else {
354  deloco_rgb8(ptr - s->image_linesize, s->row_size,
356  }
357  }
358  s->y++;
359  if (s->y == s->cur_h) {
360  s->pic_state |= PNG_ALLIMAGE;
361  if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
362  if (s->bit_depth == 16) {
363  deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
365  } else {
366  deloco_rgb8(ptr, s->row_size,
368  }
369  }
370  }
371  } else {
372  got_line = 0;
373  for (;;) {
374  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
375  if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
376  /* if we already read one row, it is time to stop to
377  * wait for the next one */
378  if (got_line)
379  break;
380  png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
381  s->last_row, s->pass_row_size, s->bpp);
382  FFSWAP(uint8_t *, s->last_row, s->tmp_row);
383  FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
384  got_line = 1;
385  }
386  if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
388  s->color_type, s->last_row);
389  }
390  s->y++;
391  if (s->y == s->cur_h) {
392  memset(s->last_row, 0, s->row_size);
393  for (;;) {
394  if (s->pass == NB_PASSES - 1) {
395  s->pic_state |= PNG_ALLIMAGE;
396  goto the_end;
397  } else {
398  s->pass++;
399  s->y = 0;
401  s->bits_per_pixel,
402  s->cur_w);
403  s->crow_size = s->pass_row_size + 1;
404  if (s->pass_row_size != 0)
405  break;
406  /* skip pass if empty row */
407  }
408  }
409  }
410  }
411 the_end:;
412  }
413 }
414 
416 {
417  int ret;
418  s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
419  s->zstream.next_in = s->gb.buffer;
420  bytestream2_skip(&s->gb, length);
421 
422  /* decode one line if possible */
423  while (s->zstream.avail_in > 0) {
424  ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
425  if (ret != Z_OK && ret != Z_STREAM_END) {
426  av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
427  return AVERROR_EXTERNAL;
428  }
429  if (s->zstream.avail_out == 0) {
430  if (!(s->pic_state & PNG_ALLIMAGE)) {
431  png_handle_row(s);
432  }
433  s->zstream.avail_out = s->crow_size;
434  s->zstream.next_out = s->crow_buf;
435  }
436  if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
438  "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
439  return 0;
440  }
441  }
442  return 0;
443 }
444 
445 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
446  const uint8_t *data_end)
447 {
448  z_stream zstream;
449  unsigned char *buf;
450  unsigned buf_size;
451  int ret;
452 
453  zstream.zalloc = ff_png_zalloc;
454  zstream.zfree = ff_png_zfree;
455  zstream.opaque = NULL;
456  if (inflateInit(&zstream) != Z_OK)
457  return AVERROR_EXTERNAL;
458  zstream.next_in = data;
459  zstream.avail_in = data_end - data;
461 
462  while (zstream.avail_in > 0) {
463  av_bprint_get_buffer(bp, 2, &buf, &buf_size);
464  if (buf_size < 2) {
465  ret = AVERROR(ENOMEM);
466  goto fail;
467  }
468  zstream.next_out = buf;
469  zstream.avail_out = buf_size - 1;
470  ret = inflate(&zstream, Z_PARTIAL_FLUSH);
471  if (ret != Z_OK && ret != Z_STREAM_END) {
472  ret = AVERROR_EXTERNAL;
473  goto fail;
474  }
475  bp->len += zstream.next_out - buf;
476  if (ret == Z_STREAM_END)
477  break;
478  }
479  inflateEnd(&zstream);
480  bp->str[bp->len] = 0;
481  return 0;
482 
483 fail:
484  inflateEnd(&zstream);
486  return ret;
487 }
488 
489 static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
490 {
491  size_t extra = 0, i;
492  uint8_t *out, *q;
493 
494  for (i = 0; i < size_in; i++)
495  extra += in[i] >= 0x80;
496  if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
497  return NULL;
498  q = out = av_malloc(size_in + extra + 1);
499  if (!out)
500  return NULL;
501  for (i = 0; i < size_in; i++) {
502  if (in[i] >= 0x80) {
503  *(q++) = 0xC0 | (in[i] >> 6);
504  *(q++) = 0x80 | (in[i] & 0x3F);
505  } else {
506  *(q++) = in[i];
507  }
508  }
509  *(q++) = 0;
510  return out;
511 }
512 
513 static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed,
514  AVDictionary **dict)
515 {
516  int ret, method;
517  const uint8_t *data = s->gb.buffer;
518  const uint8_t *data_end = data + length;
519  const uint8_t *keyword = data;
520  const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
521  uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
522  unsigned text_len;
523  AVBPrint bp;
524 
525  if (!keyword_end)
526  return AVERROR_INVALIDDATA;
527  data = keyword_end + 1;
528 
529  if (compressed) {
530  if (data == data_end)
531  return AVERROR_INVALIDDATA;
532  method = *(data++);
533  if (method)
534  return AVERROR_INVALIDDATA;
535  if ((ret = decode_zbuf(&bp, data, data_end)) < 0)
536  return ret;
537  text_len = bp.len;
538  ret = av_bprint_finalize(&bp, (char **)&text);
539  if (ret < 0)
540  return ret;
541  } else {
542  text = (uint8_t *)data;
543  text_len = data_end - text;
544  }
545 
546  kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
547  txt_utf8 = iso88591_to_utf8(text, text_len);
548  if (text != data)
549  av_free(text);
550  if (!(kw_utf8 && txt_utf8)) {
551  av_free(kw_utf8);
552  av_free(txt_utf8);
553  return AVERROR(ENOMEM);
554  }
555 
556  av_dict_set(dict, kw_utf8, txt_utf8,
558  return 0;
559 }
560 
562  uint32_t length)
563 {
564  if (length != 13)
565  return AVERROR_INVALIDDATA;
566 
567  if (s->pic_state & PNG_IDAT) {
568  av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
569  return AVERROR_INVALIDDATA;
570  }
571 
572  if (s->hdr_state & PNG_IHDR) {
573  av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
574  return AVERROR_INVALIDDATA;
575  }
576 
577  s->width = s->cur_w = bytestream2_get_be32(&s->gb);
578  s->height = s->cur_h = bytestream2_get_be32(&s->gb);
579  if (av_image_check_size(s->width, s->height, 0, avctx)) {
580  s->cur_w = s->cur_h = s->width = s->height = 0;
581  av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
582  return AVERROR_INVALIDDATA;
583  }
584  s->bit_depth = bytestream2_get_byte(&s->gb);
585  if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
586  s->bit_depth != 8 && s->bit_depth != 16) {
587  av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
588  goto error;
589  }
590  s->color_type = bytestream2_get_byte(&s->gb);
591  s->compression_type = bytestream2_get_byte(&s->gb);
592  if (s->compression_type) {
593  av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
594  goto error;
595  }
596  s->filter_type = bytestream2_get_byte(&s->gb);
597  s->interlace_type = bytestream2_get_byte(&s->gb);
598  bytestream2_skip(&s->gb, 4); /* crc */
599  s->hdr_state |= PNG_IHDR;
600  if (avctx->debug & FF_DEBUG_PICT_INFO)
601  av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
602  "compression_type=%d filter_type=%d interlace_type=%d\n",
603  s->width, s->height, s->bit_depth, s->color_type,
605 
606  return 0;
607 error:
608  s->cur_w = s->cur_h = s->width = s->height = 0;
609  s->bit_depth = 8;
610  return AVERROR_INVALIDDATA;
611 }
612 
614 {
615  if (s->pic_state & PNG_IDAT) {
616  av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
617  return AVERROR_INVALIDDATA;
618  }
619  avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb);
620  avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb);
621  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
622  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
623  bytestream2_skip(&s->gb, 1); /* unit specifier */
624  bytestream2_skip(&s->gb, 4); /* crc */
625 
626  return 0;
627 }
628 
630  uint32_t length, AVFrame *p)
631 {
632  int ret;
633  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
634 
635  if (!(s->hdr_state & PNG_IHDR)) {
636  av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
637  return AVERROR_INVALIDDATA;
638  }
639  if (!(s->pic_state & PNG_IDAT)) {
640  /* init image info */
641  ret = ff_set_dimensions(avctx, s->width, s->height);
642  if (ret < 0)
643  return ret;
644 
646  s->bits_per_pixel = s->bit_depth * s->channels;
647  s->bpp = (s->bits_per_pixel + 7) >> 3;
648  s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
649 
650  if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
652  avctx->pix_fmt = AV_PIX_FMT_RGB24;
653  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
655  avctx->pix_fmt = AV_PIX_FMT_RGBA;
656  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
658  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
659  } else if (s->bit_depth == 16 &&
661  avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
662  } else if (s->bit_depth == 16 &&
664  avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
665  } else if (s->bit_depth == 16 &&
667  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
668  } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
670  avctx->pix_fmt = AV_PIX_FMT_PAL8;
671  } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
672  avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
673  } else if (s->bit_depth == 8 &&
675  avctx->pix_fmt = AV_PIX_FMT_YA8;
676  } else if (s->bit_depth == 16 &&
678  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
679  } else {
681  "Bit depth %d color type %d",
682  s->bit_depth, s->color_type);
683  return AVERROR_PATCHWELCOME;
684  }
685 
686  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
687  switch (avctx->pix_fmt) {
688  case AV_PIX_FMT_RGB24:
689  avctx->pix_fmt = AV_PIX_FMT_RGBA;
690  break;
691 
692  case AV_PIX_FMT_RGB48BE:
693  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
694  break;
695 
696  case AV_PIX_FMT_GRAY8:
697  avctx->pix_fmt = AV_PIX_FMT_YA8;
698  break;
699 
700  case AV_PIX_FMT_GRAY16BE:
701  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
702  break;
703 
704  default:
705  avpriv_request_sample(avctx, "bit depth %d "
706  "and color type %d with TRNS",
707  s->bit_depth, s->color_type);
708  return AVERROR_INVALIDDATA;
709  }
710 
711  s->bpp += byte_depth;
712  }
713 
714  if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
715  return ret;
718  if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
719  return ret;
720  }
722  p->key_frame = 1;
724 
725  ff_thread_finish_setup(avctx);
726 
727  /* compute the compressed row size */
728  if (!s->interlace_type) {
729  s->crow_size = s->row_size + 1;
730  } else {
731  s->pass = 0;
733  s->bits_per_pixel,
734  s->cur_w);
735  s->crow_size = s->pass_row_size + 1;
736  }
737  ff_dlog(avctx, "row_size=%d crow_size =%d\n",
738  s->row_size, s->crow_size);
739  s->image_buf = p->data[0];
740  s->image_linesize = p->linesize[0];
741  /* copy the palette if needed */
742  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
743  memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
744  /* empty row is used if differencing to the first row */
746  if (!s->last_row)
747  return AVERROR_INVALIDDATA;
748  if (s->interlace_type ||
751  if (!s->tmp_row)
752  return AVERROR_INVALIDDATA;
753  }
754  /* compressed row */
756  if (!s->buffer)
757  return AVERROR(ENOMEM);
758 
759  /* we want crow_buf+1 to be 16-byte aligned */
760  s->crow_buf = s->buffer + 15;
761  s->zstream.avail_out = s->crow_size;
762  s->zstream.next_out = s->crow_buf;
763  }
764 
765  s->pic_state |= PNG_IDAT;
766 
767  /* set image to non-transparent bpp while decompressing */
769  s->bpp -= byte_depth;
770 
771  ret = png_decode_idat(s, length);
772 
774  s->bpp += byte_depth;
775 
776  if (ret < 0)
777  return ret;
778 
779  bytestream2_skip(&s->gb, 4); /* crc */
780 
781  return 0;
782 }
783 
785  uint32_t length)
786 {
787  int n, i, r, g, b;
788 
789  if ((length % 3) != 0 || length > 256 * 3)
790  return AVERROR_INVALIDDATA;
791  /* read the palette */
792  n = length / 3;
793  for (i = 0; i < n; i++) {
794  r = bytestream2_get_byte(&s->gb);
795  g = bytestream2_get_byte(&s->gb);
796  b = bytestream2_get_byte(&s->gb);
797  s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
798  }
799  for (; i < 256; i++)
800  s->palette[i] = (0xFFU << 24);
801  s->hdr_state |= PNG_PLTE;
802  bytestream2_skip(&s->gb, 4); /* crc */
803 
804  return 0;
805 }
806 
808  uint32_t length)
809 {
810  int v, i;
811 
812  if (!(s->hdr_state & PNG_IHDR)) {
813  av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
814  return AVERROR_INVALIDDATA;
815  }
816 
817  if (s->pic_state & PNG_IDAT) {
818  av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
819  return AVERROR_INVALIDDATA;
820  }
821 
823  if (length > 256 || !(s->hdr_state & PNG_PLTE))
824  return AVERROR_INVALIDDATA;
825 
826  for (i = 0; i < length; i++) {
827  unsigned v = bytestream2_get_byte(&s->gb);
828  s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
829  }
830  } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
831  if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
832  (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
833  s->bit_depth == 1)
834  return AVERROR_INVALIDDATA;
835 
836  for (i = 0; i < length / 2; i++) {
837  /* only use the least significant bits */
838  v = av_mod_uintp2(bytestream2_get_be16(&s->gb), s->bit_depth);
839 
840  if (s->bit_depth > 8)
841  AV_WB16(&s->transparent_color_be[2 * i], v);
842  else
843  s->transparent_color_be[i] = v;
844  }
845  } else {
846  return AVERROR_INVALIDDATA;
847  }
848 
849  bytestream2_skip(&s->gb, 4); /* crc */
850  s->has_trns = 1;
851 
852  return 0;
853 }
854 
856 {
857  int ret, cnt = 0;
858  uint8_t *data, profile_name[82];
859  AVBPrint bp;
860  AVFrameSideData *sd;
861 
862  while ((profile_name[cnt++] = bytestream2_get_byte(&s->gb)) && cnt < 81);
863  if (cnt > 80) {
864  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
865  return AVERROR_INVALIDDATA;
866  }
867 
868  length = FFMAX(length - cnt, 0);
869 
870  if (bytestream2_get_byte(&s->gb) != 0) {
871  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
872  return AVERROR_INVALIDDATA;
873  }
874 
875  length = FFMAX(length - 1, 0);
876 
877  if ((ret = decode_zbuf(&bp, s->gb.buffer, s->gb.buffer + length)) < 0)
878  return ret;
879 
880  ret = av_bprint_finalize(&bp, (char **)&data);
881  if (ret < 0)
882  return ret;
883 
885  if (!sd) {
886  av_free(data);
887  return AVERROR(ENOMEM);
888  }
889 
890  av_dict_set(&sd->metadata, "name", profile_name, 0);
891  memcpy(sd->data, data, bp.len);
892  av_free(data);
893 
894  /* ICC compressed data and CRC */
895  bytestream2_skip(&s->gb, length + 4);
896 
897  return 0;
898 }
899 
901 {
902  if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
903  int i, j, k;
904  uint8_t *pd = p->data[0];
905  for (j = 0; j < s->height; j++) {
906  i = s->width / 8;
907  for (k = 7; k >= 1; k--)
908  if ((s->width&7) >= k)
909  pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
910  for (i--; i >= 0; i--) {
911  pd[8*i + 7]= pd[i] & 1;
912  pd[8*i + 6]= (pd[i]>>1) & 1;
913  pd[8*i + 5]= (pd[i]>>2) & 1;
914  pd[8*i + 4]= (pd[i]>>3) & 1;
915  pd[8*i + 3]= (pd[i]>>4) & 1;
916  pd[8*i + 2]= (pd[i]>>5) & 1;
917  pd[8*i + 1]= (pd[i]>>6) & 1;
918  pd[8*i + 0]= pd[i]>>7;
919  }
920  pd += s->image_linesize;
921  }
922  } else if (s->bits_per_pixel == 2) {
923  int i, j;
924  uint8_t *pd = p->data[0];
925  for (j = 0; j < s->height; j++) {
926  i = s->width / 4;
928  if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
929  if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
930  if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
931  for (i--; i >= 0; i--) {
932  pd[4*i + 3]= pd[i] & 3;
933  pd[4*i + 2]= (pd[i]>>2) & 3;
934  pd[4*i + 1]= (pd[i]>>4) & 3;
935  pd[4*i + 0]= pd[i]>>6;
936  }
937  } else {
938  if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
939  if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
940  if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
941  for (i--; i >= 0; i--) {
942  pd[4*i + 3]= ( pd[i] & 3)*0x55;
943  pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
944  pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
945  pd[4*i + 0]= ( pd[i]>>6 )*0x55;
946  }
947  }
948  pd += s->image_linesize;
949  }
950  } else if (s->bits_per_pixel == 4) {
951  int i, j;
952  uint8_t *pd = p->data[0];
953  for (j = 0; j < s->height; j++) {
954  i = s->width/2;
956  if (s->width&1) pd[2*i+0]= pd[i]>>4;
957  for (i--; i >= 0; i--) {
958  pd[2*i + 1] = pd[i] & 15;
959  pd[2*i + 0] = pd[i] >> 4;
960  }
961  } else {
962  if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
963  for (i--; i >= 0; i--) {
964  pd[2*i + 1] = (pd[i] & 15) * 0x11;
965  pd[2*i + 0] = (pd[i] >> 4) * 0x11;
966  }
967  }
968  pd += s->image_linesize;
969  }
970  }
971 }
972 
974  uint32_t length)
975 {
976  uint32_t sequence_number;
978 
979  if (length != 26)
980  return AVERROR_INVALIDDATA;
981 
982  if (!(s->hdr_state & PNG_IHDR)) {
983  av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
984  return AVERROR_INVALIDDATA;
985  }
986 
987  if (s->pic_state & PNG_IDAT) {
988  av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
989  return AVERROR_INVALIDDATA;
990  }
991 
992  s->last_w = s->cur_w;
993  s->last_h = s->cur_h;
994  s->last_x_offset = s->x_offset;
995  s->last_y_offset = s->y_offset;
996  s->last_dispose_op = s->dispose_op;
997 
998  sequence_number = bytestream2_get_be32(&s->gb);
999  cur_w = bytestream2_get_be32(&s->gb);
1000  cur_h = bytestream2_get_be32(&s->gb);
1001  x_offset = bytestream2_get_be32(&s->gb);
1002  y_offset = bytestream2_get_be32(&s->gb);
1003  bytestream2_skip(&s->gb, 4); /* delay_num (2), delay_den (2) */
1004  dispose_op = bytestream2_get_byte(&s->gb);
1005  blend_op = bytestream2_get_byte(&s->gb);
1006  bytestream2_skip(&s->gb, 4); /* crc */
1007 
1008  if (sequence_number == 0 &&
1009  (cur_w != s->width ||
1010  cur_h != s->height ||
1011  x_offset != 0 ||
1012  y_offset != 0) ||
1013  cur_w <= 0 || cur_h <= 0 ||
1014  x_offset < 0 || y_offset < 0 ||
1015  cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1016  return AVERROR_INVALIDDATA;
1017 
1018  if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1019  av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1020  return AVERROR_INVALIDDATA;
1021  }
1022 
1023  if ((sequence_number == 0 || !s->previous_picture.f->data[0]) &&
1024  dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1025  // No previous frame to revert to for the first frame
1026  // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1027  dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1028  }
1029 
1030  if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1031  avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1032  avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1033  avctx->pix_fmt == AV_PIX_FMT_PAL8 ||
1034  avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1035  avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1036  avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1037  )) {
1038  // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1039  blend_op = APNG_BLEND_OP_SOURCE;
1040  }
1041 
1042  s->cur_w = cur_w;
1043  s->cur_h = cur_h;
1044  s->x_offset = x_offset;
1045  s->y_offset = y_offset;
1046  s->dispose_op = dispose_op;
1047  s->blend_op = blend_op;
1048 
1049  return 0;
1050 }
1051 
1053 {
1054  int i, j;
1055  uint8_t *pd = p->data[0];
1056  uint8_t *pd_last = s->last_picture.f->data[0];
1057  int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
1058 
1059  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1060  for (j = 0; j < s->height; j++) {
1061  for (i = 0; i < ls; i++)
1062  pd[i] += pd_last[i];
1063  pd += s->image_linesize;
1064  pd_last += s->image_linesize;
1065  }
1066 }
1067 
1068 // divide by 255 and round to nearest
1069 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1070 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1071 
1073  AVFrame *p)
1074 {
1075  size_t x, y;
1076  uint8_t *buffer;
1077 
1078  if (s->blend_op == APNG_BLEND_OP_OVER &&
1079  avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1080  avctx->pix_fmt != AV_PIX_FMT_GRAY8A &&
1081  avctx->pix_fmt != AV_PIX_FMT_PAL8) {
1082  avpriv_request_sample(avctx, "Blending with pixel format %s",
1083  av_get_pix_fmt_name(avctx->pix_fmt));
1084  return AVERROR_PATCHWELCOME;
1085  }
1086 
1087  buffer = av_malloc_array(s->image_linesize, s->height);
1088  if (!buffer)
1089  return AVERROR(ENOMEM);
1090 
1091 
1092  // Do the disposal operation specified by the last frame on the frame
1094  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1095  memcpy(buffer, s->last_picture.f->data[0], s->image_linesize * s->height);
1096 
1098  for (y = s->last_y_offset; y < s->last_y_offset + s->last_h; ++y)
1099  memset(buffer + s->image_linesize * y + s->bpp * s->last_x_offset, 0, s->bpp * s->last_w);
1100 
1101  memcpy(s->previous_picture.f->data[0], buffer, s->image_linesize * s->height);
1103  } else {
1104  ff_thread_await_progress(&s->previous_picture, INT_MAX, 0);
1105  memcpy(buffer, s->previous_picture.f->data[0], s->image_linesize * s->height);
1106  }
1107 
1108  // Perform blending
1109  if (s->blend_op == APNG_BLEND_OP_SOURCE) {
1110  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1111  size_t row_start = s->image_linesize * y + s->bpp * s->x_offset;
1112  memcpy(buffer + row_start, p->data[0] + row_start, s->bpp * s->cur_w);
1113  }
1114  } else { // APNG_BLEND_OP_OVER
1115  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1116  uint8_t *foreground = p->data[0] + s->image_linesize * y + s->bpp * s->x_offset;
1117  uint8_t *background = buffer + s->image_linesize * y + s->bpp * s->x_offset;
1118  for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += s->bpp, background += s->bpp) {
1119  size_t b;
1120  uint8_t foreground_alpha, background_alpha, output_alpha;
1121  uint8_t output[10];
1122 
1123  // Since we might be blending alpha onto alpha, we use the following equations:
1124  // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1125  // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1126 
1127  switch (avctx->pix_fmt) {
1128  case AV_PIX_FMT_RGBA:
1129  foreground_alpha = foreground[3];
1130  background_alpha = background[3];
1131  break;
1132 
1133  case AV_PIX_FMT_GRAY8A:
1134  foreground_alpha = foreground[1];
1135  background_alpha = background[1];
1136  break;
1137 
1138  case AV_PIX_FMT_PAL8:
1139  foreground_alpha = s->palette[foreground[0]] >> 24;
1140  background_alpha = s->palette[background[0]] >> 24;
1141  break;
1142  }
1143 
1144  if (foreground_alpha == 0)
1145  continue;
1146 
1147  if (foreground_alpha == 255) {
1148  memcpy(background, foreground, s->bpp);
1149  continue;
1150  }
1151 
1152  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1153  // TODO: Alpha blending with PAL8 will likely need the entire image converted over to RGBA first
1154  avpriv_request_sample(avctx, "Alpha blending palette samples");
1155  background[0] = foreground[0];
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(background, output, s->bpp);
1174  }
1175  }
1176  }
1177 
1178  // Copy blended buffer into the frame and free
1179  memcpy(p->data[0], buffer, s->image_linesize * s->height);
1180  av_free(buffer);
1181 
1182  return 0;
1183 }
1184 
1186  AVFrame *p, AVPacket *avpkt)
1187 {
1188  const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1189  AVDictionary **metadatap = NULL;
1190  uint32_t tag, length;
1191  int decode_next_dat = 0;
1192  int i, ret;
1193 
1194  for (;;) {
1195  length = bytestream2_get_bytes_left(&s->gb);
1196  if (length <= 0) {
1197 
1198  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1199  avctx->skip_frame == AVDISCARD_ALL) {
1200  return 0;
1201  }
1202 
1203  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1204  if (!(s->pic_state & PNG_IDAT))
1205  return 0;
1206  else
1207  goto exit_loop;
1208  }
1209  av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1210  if ( s->pic_state & PNG_ALLIMAGE
1212  goto exit_loop;
1213  ret = AVERROR_INVALIDDATA;
1214  goto fail;
1215  }
1216 
1217  length = bytestream2_get_be32(&s->gb);
1218  if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) {
1219  av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1220  ret = AVERROR_INVALIDDATA;
1221  goto fail;
1222  }
1223  if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1224  uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1225  uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1226  if (crc_sig ^ crc_cal) {
1227  av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1228  if (avctx->err_recognition & AV_EF_EXPLODE) {
1229  av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1230  ret = AVERROR_INVALIDDATA;
1231  goto fail;
1232  }
1233  av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1234  bytestream2_skip(&s->gb, 4); /* tag */
1235  goto skip_tag;
1236  }
1237  }
1238  tag = bytestream2_get_le32(&s->gb);
1239  if (avctx->debug & FF_DEBUG_STARTCODE)
1240  av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1241  av_fourcc2str(tag), length);
1242 
1243  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1244  avctx->skip_frame == AVDISCARD_ALL) {
1245  switch(tag) {
1246  case MKTAG('I', 'H', 'D', 'R'):
1247  case MKTAG('p', 'H', 'Y', 's'):
1248  case MKTAG('t', 'E', 'X', 't'):
1249  case MKTAG('I', 'D', 'A', 'T'):
1250  case MKTAG('t', 'R', 'N', 'S'):
1251  break;
1252  default:
1253  goto skip_tag;
1254  }
1255  }
1256 
1257  metadatap = &p->metadata;
1258  switch (tag) {
1259  case MKTAG('I', 'H', 'D', 'R'):
1260  if ((ret = decode_ihdr_chunk(avctx, s, length)) < 0)
1261  goto fail;
1262  break;
1263  case MKTAG('p', 'H', 'Y', 's'):
1264  if ((ret = decode_phys_chunk(avctx, s)) < 0)
1265  goto fail;
1266  break;
1267  case MKTAG('f', 'c', 'T', 'L'):
1268  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1269  goto skip_tag;
1270  if ((ret = decode_fctl_chunk(avctx, s, length)) < 0)
1271  goto fail;
1272  decode_next_dat = 1;
1273  break;
1274  case MKTAG('f', 'd', 'A', 'T'):
1275  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1276  goto skip_tag;
1277  if (!decode_next_dat || length < 4) {
1278  ret = AVERROR_INVALIDDATA;
1279  goto fail;
1280  }
1281  bytestream2_get_be32(&s->gb);
1282  length -= 4;
1283  /* fallthrough */
1284  case MKTAG('I', 'D', 'A', 'T'):
1285  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1286  goto skip_tag;
1287  if ((ret = decode_idat_chunk(avctx, s, length, p)) < 0)
1288  goto fail;
1289  break;
1290  case MKTAG('P', 'L', 'T', 'E'):
1291  if (decode_plte_chunk(avctx, s, length) < 0)
1292  goto skip_tag;
1293  break;
1294  case MKTAG('t', 'R', 'N', 'S'):
1295  if (decode_trns_chunk(avctx, s, length) < 0)
1296  goto skip_tag;
1297  break;
1298  case MKTAG('t', 'E', 'X', 't'):
1299  if (decode_text_chunk(s, length, 0, metadatap) < 0)
1300  av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1301  bytestream2_skip(&s->gb, length + 4);
1302  break;
1303  case MKTAG('z', 'T', 'X', 't'):
1304  if (decode_text_chunk(s, length, 1, metadatap) < 0)
1305  av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1306  bytestream2_skip(&s->gb, length + 4);
1307  break;
1308  case MKTAG('s', 'T', 'E', 'R'): {
1309  int mode = bytestream2_get_byte(&s->gb);
1311  if (!stereo3d) {
1312  ret = AVERROR(ENOMEM);
1313  goto fail;
1314  }
1315 
1316  if (mode == 0 || mode == 1) {
1317  stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1318  stereo3d->flags = mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1319  } else {
1320  av_log(avctx, AV_LOG_WARNING,
1321  "Unknown value in sTER chunk (%d)\n", mode);
1322  }
1323  bytestream2_skip(&s->gb, 4); /* crc */
1324  break;
1325  }
1326  case MKTAG('i', 'C', 'C', 'P'): {
1327  if ((ret = decode_iccp_chunk(s, length, p)) < 0)
1328  goto fail;
1329  break;
1330  }
1331  case MKTAG('c', 'H', 'R', 'M'): {
1333  if (!mdm) {
1334  ret = AVERROR(ENOMEM);
1335  goto fail;
1336  }
1337 
1338  mdm->white_point[0] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1339  mdm->white_point[1] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1340 
1341  /* RGB Primaries */
1342  for (i = 0; i < 3; i++) {
1343  mdm->display_primaries[i][0] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1344  mdm->display_primaries[i][1] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1345  }
1346 
1347  mdm->has_primaries = 1;
1348  bytestream2_skip(&s->gb, 4); /* crc */
1349  break;
1350  }
1351  case MKTAG('g', 'A', 'M', 'A'): {
1352  AVBPrint bp;
1353  char *gamma_str;
1354  int num = bytestream2_get_be32(&s->gb);
1355 
1357  av_bprintf(&bp, "%i/%i", num, 100000);
1358  ret = av_bprint_finalize(&bp, &gamma_str);
1359  if (ret < 0)
1360  return ret;
1361 
1362  av_dict_set(&p->metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1363 
1364  bytestream2_skip(&s->gb, 4); /* crc */
1365  break;
1366  }
1367  case MKTAG('I', 'E', 'N', 'D'):
1368  if (!(s->pic_state & PNG_ALLIMAGE))
1369  av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1370  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1371  ret = AVERROR_INVALIDDATA;
1372  goto fail;
1373  }
1374  bytestream2_skip(&s->gb, 4); /* crc */
1375  goto exit_loop;
1376  default:
1377  /* skip tag */
1378 skip_tag:
1379  bytestream2_skip(&s->gb, length + 4);
1380  break;
1381  }
1382  }
1383 exit_loop:
1384 
1385  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1386  avctx->skip_frame == AVDISCARD_ALL) {
1387  return 0;
1388  }
1389 
1391  return AVERROR_INVALIDDATA;
1392 
1393  if (s->bits_per_pixel <= 4)
1394  handle_small_bpp(s, p);
1395 
1396  /* apply transparency if needed */
1397  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1398  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1399  size_t raw_bpp = s->bpp - byte_depth;
1400  unsigned x, y;
1401 
1402  av_assert0(s->bit_depth > 1);
1403 
1404  for (y = 0; y < s->height; ++y) {
1405  uint8_t *row = &s->image_buf[s->image_linesize * y];
1406 
1407  if (s->bpp == 2 && byte_depth == 1) {
1408  uint8_t *pixel = &row[2 * s->width - 1];
1409  uint8_t *rowp = &row[1 * s->width - 1];
1410  int tcolor = s->transparent_color_be[0];
1411  for (x = s->width; x > 0; --x) {
1412  *pixel-- = *rowp == tcolor ? 0 : 0xff;
1413  *pixel-- = *rowp--;
1414  }
1415  } else if (s->bpp == 4 && byte_depth == 1) {
1416  uint8_t *pixel = &row[4 * s->width - 1];
1417  uint8_t *rowp = &row[3 * s->width - 1];
1418  int tcolor = AV_RL24(s->transparent_color_be);
1419  for (x = s->width; x > 0; --x) {
1420  *pixel-- = AV_RL24(rowp-2) == tcolor ? 0 : 0xff;
1421  *pixel-- = *rowp--;
1422  *pixel-- = *rowp--;
1423  *pixel-- = *rowp--;
1424  }
1425  } else {
1426  /* since we're updating in-place, we have to go from right to left */
1427  for (x = s->width; x > 0; --x) {
1428  uint8_t *pixel = &row[s->bpp * (x - 1)];
1429  memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1430 
1431  if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1432  memset(&pixel[raw_bpp], 0, byte_depth);
1433  } else {
1434  memset(&pixel[raw_bpp], 0xff, byte_depth);
1435  }
1436  }
1437  }
1438  }
1439  }
1440 
1441  /* handle P-frames only if a predecessor frame is available */
1442  if (s->last_picture.f->data[0]) {
1443  if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1444  && s->last_picture.f->width == p->width
1445  && s->last_picture.f->height== p->height
1446  && s->last_picture.f->format== p->format
1447  ) {
1448  if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1449  handle_p_frame_png(s, p);
1450  else if (CONFIG_APNG_DECODER &&
1451  s->previous_picture.f->width == p->width &&
1452  s->previous_picture.f->height== p->height &&
1453  s->previous_picture.f->format== p->format &&
1454  avctx->codec_id == AV_CODEC_ID_APNG &&
1455  (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1456  goto fail;
1457  }
1458  }
1459  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1461 
1462  return 0;
1463 
1464 fail:
1465  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1467  return ret;
1468 }
1469 
1470 #if CONFIG_PNG_DECODER
1471 static int decode_frame_png(AVCodecContext *avctx,
1472  void *data, int *got_frame,
1473  AVPacket *avpkt)
1474 {
1475  PNGDecContext *const s = avctx->priv_data;
1476  const uint8_t *buf = avpkt->data;
1477  int buf_size = avpkt->size;
1478  AVFrame *p;
1479  int64_t sig;
1480  int ret;
1481 
1484  p = s->picture.f;
1485 
1486  bytestream2_init(&s->gb, buf, buf_size);
1487 
1488  /* check signature */
1489  sig = bytestream2_get_be64(&s->gb);
1490  if (sig != PNGSIG &&
1491  sig != MNGSIG) {
1492  av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1493  return AVERROR_INVALIDDATA;
1494  }
1495 
1496  s->y = s->has_trns = 0;
1497  s->hdr_state = 0;
1498  s->pic_state = 0;
1499 
1500  /* init the zlib */
1501  s->zstream.zalloc = ff_png_zalloc;
1502  s->zstream.zfree = ff_png_zfree;
1503  s->zstream.opaque = NULL;
1504  ret = inflateInit(&s->zstream);
1505  if (ret != Z_OK) {
1506  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1507  return AVERROR_EXTERNAL;
1508  }
1509 
1510  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1511  goto the_end;
1512 
1513  if (avctx->skip_frame == AVDISCARD_ALL) {
1514  *got_frame = 0;
1515  ret = bytestream2_tell(&s->gb);
1516  goto the_end;
1517  }
1518 
1519  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1520  goto the_end;
1521 
1522  *got_frame = 1;
1523 
1524  ret = bytestream2_tell(&s->gb);
1525 the_end:
1526  inflateEnd(&s->zstream);
1527  s->crow_buf = NULL;
1528  return ret;
1529 }
1530 #endif
1531 
1532 #if CONFIG_APNG_DECODER
1533 static int decode_frame_apng(AVCodecContext *avctx,
1534  void *data, int *got_frame,
1535  AVPacket *avpkt)
1536 {
1537  PNGDecContext *const s = avctx->priv_data;
1538  int ret;
1539  AVFrame *p;
1540 
1543  p = s->picture.f;
1544 
1545  if (!(s->hdr_state & PNG_IHDR)) {
1546  if (!avctx->extradata_size)
1547  return AVERROR_INVALIDDATA;
1548 
1549  /* only init fields, there is no zlib use in extradata */
1550  s->zstream.zalloc = ff_png_zalloc;
1551  s->zstream.zfree = ff_png_zfree;
1552 
1553  bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1554  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1555  goto end;
1556  }
1557 
1558  /* reset state for a new frame */
1559  if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1560  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1561  ret = AVERROR_EXTERNAL;
1562  goto end;
1563  }
1564  s->y = 0;
1565  s->pic_state = 0;
1566  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1567  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1568  goto end;
1569 
1570  if (!(s->pic_state & PNG_ALLIMAGE))
1571  av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1572  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1573  ret = AVERROR_INVALIDDATA;
1574  goto end;
1575  }
1576  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1577  goto end;
1578 
1579  *got_frame = 1;
1580  ret = bytestream2_tell(&s->gb);
1581 
1582 end:
1583  inflateEnd(&s->zstream);
1584  return ret;
1585 }
1586 #endif
1587 
1588 #if CONFIG_LSCR_DECODER
1589 static int decode_frame_lscr(AVCodecContext *avctx,
1590  void *data, int *got_frame,
1591  AVPacket *avpkt)
1592 {
1593  PNGDecContext *const s = avctx->priv_data;
1594  GetByteContext *gb = &s->gb;
1595  AVFrame *frame = data;
1596  int ret, nb_blocks, offset = 0;
1597 
1598  if (avpkt->size < 2)
1599  return AVERROR_INVALIDDATA;
1600  if (avpkt->size == 2)
1601  return 0;
1602 
1603  bytestream2_init(gb, avpkt->data, avpkt->size);
1604 
1605  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
1606  return ret;
1607 
1608  nb_blocks = bytestream2_get_le16(gb);
1609  if (bytestream2_get_bytes_left(gb) < 2 + nb_blocks * (12 + 8))
1610  return AVERROR_INVALIDDATA;
1611 
1612  if (s->last_picture.f->data[0]) {
1613  ret = av_frame_copy(frame, s->last_picture.f);
1614  if (ret < 0)
1615  return ret;
1616  }
1617 
1618  for (int b = 0; b < nb_blocks; b++) {
1619  int x, y, x2, y2, w, h, left;
1620  uint32_t csize, size;
1621 
1622  s->zstream.zalloc = ff_png_zalloc;
1623  s->zstream.zfree = ff_png_zfree;
1624  s->zstream.opaque = NULL;
1625 
1626  if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1627  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1628  ret = AVERROR_EXTERNAL;
1629  goto end;
1630  }
1631 
1632  bytestream2_seek(gb, 2 + b * 12, SEEK_SET);
1633 
1634  x = bytestream2_get_le16(gb);
1635  y = bytestream2_get_le16(gb);
1636  x2 = bytestream2_get_le16(gb);
1637  y2 = bytestream2_get_le16(gb);
1638  s->width = s->cur_w = w = x2-x;
1639  s->height = s->cur_h = h = y2-y;
1640 
1641  if (w <= 0 || x < 0 || x >= avctx->width || w + x > avctx->width ||
1642  h <= 0 || y < 0 || y >= avctx->height || h + y > avctx->height) {
1643  ret = AVERROR_INVALIDDATA;
1644  goto end;
1645  }
1646 
1647  size = bytestream2_get_le32(gb);
1648 
1649  frame->key_frame = (nb_blocks == 1) &&
1650  (w == avctx->width) &&
1651  (h == avctx->height) &&
1652  (x == 0) && (y == 0);
1653 
1654  bytestream2_seek(gb, 2 + nb_blocks * 12 + offset, SEEK_SET);
1655  csize = bytestream2_get_be32(gb);
1656  if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) {
1657  ret = AVERROR_INVALIDDATA;
1658  goto end;
1659  }
1660 
1661  offset += size;
1662  left = size;
1663 
1664  s->y = 0;
1665  s->row_size = w * 3;
1666 
1667  av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
1668  if (!s->buffer) {
1669  ret = AVERROR(ENOMEM);
1670  goto end;
1671  }
1672 
1674  if (!s->last_row) {
1675  ret = AVERROR(ENOMEM);
1676  goto end;
1677  }
1678 
1679  s->crow_size = w * 3 + 1;
1680  s->crow_buf = s->buffer + 15;
1681  s->zstream.avail_out = s->crow_size;
1682  s->zstream.next_out = s->crow_buf;
1683  s->image_buf = frame->data[0] + (avctx->height - y - 1) * frame->linesize[0] + x * 3;
1684  s->image_linesize =-frame->linesize[0];
1685  s->bpp = 3;
1686  s->pic_state = 0;
1687 
1688  while (left > 16) {
1689  ret = png_decode_idat(s, csize);
1690  if (ret < 0)
1691  goto end;
1692  left -= csize + 16;
1693  if (left > 16) {
1694  bytestream2_skip(gb, 4);
1695  csize = bytestream2_get_be32(gb);
1696  if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) {
1697  ret = AVERROR_INVALIDDATA;
1698  goto end;
1699  }
1700  }
1701  }
1702 
1703  inflateEnd(&s->zstream);
1704  }
1705 
1707 
1709  if ((ret = av_frame_ref(s->last_picture.f, frame)) < 0)
1710  return ret;
1711 
1712  *got_frame = 1;
1713 end:
1714  inflateEnd(&s->zstream);
1715 
1716  if (ret < 0)
1717  return ret;
1718  return avpkt->size;
1719 }
1720 
1721 static void decode_flush(AVCodecContext *avctx)
1722 {
1723  PNGDecContext *s = avctx->priv_data;
1724 
1726 }
1727 
1728 #endif
1729 
1730 #if HAVE_THREADS
1731 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1732 {
1733  PNGDecContext *psrc = src->priv_data;
1734  PNGDecContext *pdst = dst->priv_data;
1735  int ret;
1736 
1737  if (dst == src)
1738  return 0;
1739 
1740  ff_thread_release_buffer(dst, &pdst->picture);
1741  if (psrc->picture.f->data[0] &&
1742  (ret = ff_thread_ref_frame(&pdst->picture, &psrc->picture)) < 0)
1743  return ret;
1744  if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1745  pdst->width = psrc->width;
1746  pdst->height = psrc->height;
1747  pdst->bit_depth = psrc->bit_depth;
1748  pdst->color_type = psrc->color_type;
1749  pdst->compression_type = psrc->compression_type;
1750  pdst->interlace_type = psrc->interlace_type;
1751  pdst->filter_type = psrc->filter_type;
1752  pdst->cur_w = psrc->cur_w;
1753  pdst->cur_h = psrc->cur_h;
1754  pdst->x_offset = psrc->x_offset;
1755  pdst->y_offset = psrc->y_offset;
1756  pdst->has_trns = psrc->has_trns;
1757  memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1758 
1759  pdst->dispose_op = psrc->dispose_op;
1760 
1761  memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1762 
1763  pdst->hdr_state |= psrc->hdr_state;
1764 
1766  if (psrc->last_picture.f->data[0] &&
1767  (ret = ff_thread_ref_frame(&pdst->last_picture, &psrc->last_picture)) < 0)
1768  return ret;
1769 
1771  if (psrc->previous_picture.f->data[0] &&
1772  (ret = ff_thread_ref_frame(&pdst->previous_picture, &psrc->previous_picture)) < 0)
1773  return ret;
1774  }
1775 
1776  return 0;
1777 }
1778 #endif
1779 
1781 {
1782  PNGDecContext *s = avctx->priv_data;
1783 
1784  avctx->color_range = AVCOL_RANGE_JPEG;
1785 
1786  if (avctx->codec_id == AV_CODEC_ID_LSCR)
1787  avctx->pix_fmt = AV_PIX_FMT_BGR24;
1788 
1789  s->avctx = avctx;
1791  s->last_picture.f = av_frame_alloc();
1792  s->picture.f = av_frame_alloc();
1793  if (!s->previous_picture.f || !s->last_picture.f || !s->picture.f) {
1796  av_frame_free(&s->picture.f);
1797  return AVERROR(ENOMEM);
1798  }
1799 
1800  ff_pngdsp_init(&s->dsp);
1801 
1802  return 0;
1803 }
1804 
1806 {
1807  PNGDecContext *s = avctx->priv_data;
1808 
1813  ff_thread_release_buffer(avctx, &s->picture);
1814  av_frame_free(&s->picture.f);
1815  av_freep(&s->buffer);
1816  s->buffer_size = 0;
1817  av_freep(&s->last_row);
1818  s->last_row_size = 0;
1819  av_freep(&s->tmp_row);
1820  s->tmp_row_size = 0;
1821 
1822  return 0;
1823 }
1824 
1825 #if CONFIG_APNG_DECODER
1827  .name = "apng",
1828  .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1829  .type = AVMEDIA_TYPE_VIDEO,
1830  .id = AV_CODEC_ID_APNG,
1831  .priv_data_size = sizeof(PNGDecContext),
1832  .init = png_dec_init,
1833  .close = png_dec_end,
1834  .decode = decode_frame_apng,
1836  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1837  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
1839 };
1840 #endif
1841 
1842 #if CONFIG_PNG_DECODER
1844  .name = "png",
1845  .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1846  .type = AVMEDIA_TYPE_VIDEO,
1847  .id = AV_CODEC_ID_PNG,
1848  .priv_data_size = sizeof(PNGDecContext),
1849  .init = png_dec_init,
1850  .close = png_dec_end,
1851  .decode = decode_frame_png,
1853  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1856 };
1857 #endif
1858 
1859 #if CONFIG_LSCR_DECODER
1861  .name = "lscr",
1862  .long_name = NULL_IF_CONFIG_SMALL("LEAD Screen Capture"),
1863  .type = AVMEDIA_TYPE_VIDEO,
1864  .id = AV_CODEC_ID_LSCR,
1865  .priv_data_size = sizeof(PNGDecContext),
1866  .init = png_dec_init,
1867  .close = png_dec_end,
1868  .decode = decode_frame_lscr,
1869  .flush = decode_flush,
1870  .capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1873 };
1874 #endif
#define AV_STEREO3D_FLAG_INVERT
Inverted views, Right/Bottom represents the left view.
Definition: stereo3d.h:167
static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length, AVFrame *p)
Definition: pngdec.c:629
static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:973
#define PNG_FILTER_VALUE_AVG
Definition: png.h:41
static void png_handle_row(PNGDecContext *s)
Definition: pngdec.c:334
ThreadFrame previous_picture
Definition: pngdec.c:57
#define NULL
Definition: coverity.c:32
int last_y_offset
Definition: pngdec.c:67
int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
Compute the size of an image line with format pix_fmt and width width for the plane plane...
Definition: imgutils.c:76
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
int width
Definition: pngdec.c:63
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static void flush(AVCodecContext *avctx)
unsigned int tmp_row_size
Definition: pngdec.c:88
8 bits gray, 8 bits alpha
Definition: pixfmt.h:143
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
AVFrame * f
Definition: thread.h:35
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:106
const char * g
Definition: vf_curves.c:115
int pass_row_size
Definition: pngdec.c:94
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVDictionary * metadata
Definition: frame.h:218
uint8_t * tmp_row
Definition: pngdec.c:87
#define avpriv_request_sample(...)
PNGHeaderState
Definition: pngdec.c:42
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1161
AVRational white_point[2]
CIE 1931 xy chromaticity coords of white point.
int num
Numerator.
Definition: rational.h:59
static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed, AVDictionary **dict)
Definition: pngdec.c:513
int size
Definition: packet.h:364
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:905
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:36
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:72
enum PNGImageState pic_state
Definition: pngdec.c:62
int has_primaries
Flag indicating whether the display primaries (and white point) are set.
discard all
Definition: avcodec.h:236
Views are next to each other.
Definition: stereo3d.h:67
#define PNG_COLOR_TYPE_RGB
Definition: png.h:33
static void error(const char *err)
void(* add_bytes_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition: pngdsp.h:28
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
#define PNG_COLOR_TYPE_GRAY_ALPHA
Definition: png.h:35
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:32
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
int filter_type
Definition: pngdec.c:74
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdec.c:187
#define AV_DICT_DONT_STRDUP_KEY
Take ownership of a key that&#39;s been allocated with av_malloc() or another memory allocation function...
Definition: dict.h:73
#define PNG_FILTER_VALUE_PAETH
Definition: png.h:42
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2004
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
static int percent_missing(PNGDecContext *s)
Definition: pngdec.c:324
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
int y_offset
Definition: pngdec.c:66
uint8_t
#define av_cold
Definition: attributes.h:88
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define PNG_COLOR_TYPE_RGB_ALPHA
Definition: png.h:34
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
Stereo 3D type: this structure describes how two videos are packed within a single video surface...
Definition: stereo3d.h:176
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1612
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
#define f(width, name)
Definition: cbs_vp9.c:255
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:92
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
Multithreading support functions.
AVCodec ff_apng_decoder
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
packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is st...
Definition: pixfmt.h:205
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:456
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
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:87
Public header for CRC hash function implementation.
static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s)
Definition: pngdec.c:613
Structure to hold side data for an AVFrame.
Definition: frame.h:214
uint8_t * data
Definition: packet.h:363
const uint8_t * buffer
Definition: bytestream.h:34
uint32_t tag
Definition: movenc.c:1532
#define ff_dlog(a,...)
AVDictionary * metadata
metadata.
Definition: frame.h:594
static int decode_iccp_chunk(PNGDecContext *s, int length, AVFrame *f)
Definition: pngdec.c:855
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:455
AVCodec ff_lscr_decoder
ptrdiff_t size
Definition: opengl_enc.c:100
unsigned int last_row_size
Definition: pngdec.c:86
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
int cur_h
Definition: pngdec.c:64
#define av_log(a,...)
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: internal.h:75
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:401
static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:784
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define U(x)
Definition: vp56_arith.h:37
#define src
Definition: vp8dsp.c:254
int width
Definition: frame.h:366
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
static const uint8_t png_pass_dsp_mask[NB_PASSES]
Definition: pngdec.c:110
int flags
Additional information about the frame packing.
Definition: stereo3d.h:185
16 bits gray, 16 bits alpha (big-endian)
Definition: pixfmt.h:212
#define AV_BPRINT_SIZE_UNLIMITED
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p, AVPacket *avpkt)
Definition: pngdec.c:1185
static const uint16_t mask[17]
Definition: lzw.c:38
#define OP_SUB(x, s, l)
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1052
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
uint8_t * crow_buf
Definition: pngdec.c:84
const char * r
Definition: vf_curves.c:114
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
int pass
Definition: pngdec.c:91
int ff_png_get_nb_channels(int color_type)
Definition: png.c:49
ThreadFrame picture
Definition: pngdec.c:59
int height
Definition: pngdec.c:63
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
#define PNGSIG
Definition: png.h:47
simple assert() macros that are a bit more flexible than ISO C assert().
GLsizei GLsizei * length
Definition: opengl_enc.c:114
const char * name
Name of the codec implementation.
Definition: codec.h:197
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
Definition: bytestream.h:87
int bits_per_pixel
Definition: pngdec.c:76
GetByteContext gb
Definition: pngdec.c:56
#define FFMAX(a, b)
Definition: common.h:94
#define NB_PASSES
Definition: png.h:45
#define fail()
Definition: checkasm.h:123
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:106
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:812
uint8_t blend_op
Definition: pngdec.c:68
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:369
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:192
AVStereo3D * av_stereo3d_create_side_data(AVFrame *frame)
Allocate a complete AVFrameSideData and add it to the frame.
Definition: stereo3d.c:33
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
z_stream zstream
Definition: pngdec.c:96
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:317
#define b
Definition: input.c:41
AVMasteringDisplayMetadata * av_mastering_display_metadata_create_side_data(AVFrame *frame)
Allocate a complete AVMasteringDisplayMetadata and add it to the frame.
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:391
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:146
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1655
#define FFMIN(a, b)
Definition: common.h:96
#define PNG_FILTER_VALUE_SUB
Definition: png.h:39
uint32_t palette[256]
Definition: pngdec.c:83
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define PNG_COLOR_TYPE_GRAY
Definition: png.h:31
static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, uint8_t *src, uint8_t *last, int size, int bpp)
Definition: pngdec.c:253
int width
picture width / height.
Definition: avcodec.h:699
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
uint8_t w
Definition: llviddspenc.c:38
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
Notify later decoding threads when part of their reference picture is ready.
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:392
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
#define s(width, name)
Definition: cbs_vp9.c:257
uint8_t * last_row
Definition: pngdec.c:85
The data contains an ICC profile as an opaque octet buffer following the format described by ISO 1507...
Definition: frame.h:143
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1666
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AVCodecContext * avctx
Definition: pngdec.c:54
void av_bprint_get_buffer(AVBPrint *buf, unsigned size, unsigned char **mem, unsigned *actual_size)
Allocate bytes in the buffer for external use.
Definition: bprint.c:218
av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
Definition: pngdsp.c:43
static int decode_zbuf(AVBPrint *bp, const uint8_t *data, const uint8_t *data_end)
Definition: pngdec.c:445
int channels
Definition: pngdec.c:75
int ff_thread_ref_frame(ThreadFrame *dst, const ThreadFrame *src)
Definition: utils.c:1858
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:538
if(ret)
static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:561
static uint8_t * iso88591_to_utf8(const uint8_t *in, size_t size_in)
Definition: pngdec.c:489
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:381
static av_cold int png_dec_init(AVCodecContext *avctx)
Definition: pngdec.c:1780
enum AVStereo3DType type
How views are packed within the video.
Definition: stereo3d.h:180
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:2336
Libavcodec external API header.
enum PNGHeaderState hdr_state
Definition: pngdec.c:61
int buffer_size
Definition: pngdec.c:90
static int skip_tag(AVIOContext *in, int32_t tag_name)
Definition: ismindex.c:132
enum AVCodecID codec_id
Definition: avcodec.h:536
#define PNG_FILTER_VALUE_UP
Definition: png.h:40
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:339
#define PNG_FILTER_TYPE_LOCO
Definition: png.h:37
uint8_t last_dispose_op
Definition: pngdec.c:69
#define abs(x)
Definition: cuda_runtime.h:35
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
int debug
debug
Definition: avcodec.h:1611
main external API structure.
Definition: avcodec.h:526
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:551
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1872
uint8_t * data
Definition: frame.h:216
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2]...the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so...,+,-,+,-,+,+,-,+,-,+,...hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32-hcoeff[1]-hcoeff[2]-...a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2}an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||.........intra?||||:Block01:yes no||||:Block02:.................||||:Block03::y DC::ref index:||||:Block04::cb DC::motion x:||||.........:cr DC::motion y:||||.................|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------------------------------|||Y subbands||Cb subbands||Cr subbands||||------||------||------|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||------||------||------||||------||------||------|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||------||------||------||||------||------||------|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||------||------||------||||------||------||------|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------------------------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction------------|\Dequantization-------------------\||Reference frames|\IDWT|--------------|Motion\|||Frame 0||Frame 1||Compensation.OBMC v-------|--------------|--------------.\------> Frame n output Frame Frame<----------------------------------/|...|-------------------Range Coder:============Binary Range Coder:-------------------The implemented range coder is an adapted version based upon"Range encoding: an algorithm for removing redundancy from a digitised message."by G.N.N.Martin.The symbols encoded by the Snow range coder are bits(0|1).The associated probabilities are not fix but change depending on the symbol mix seen so far.bit seen|new state---------+-----------------------------------------------0|256-state_transition_table[256-old_state];1|state_transition_table[old_state];state_transition_table={0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:-------------------------FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1.the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:206
int interlace_type
Definition: pngdec.c:73
PNGImageState
Definition: pngdec.c:47
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
const uint8_t ff_png_pass_ymask[NB_PASSES]
Definition: png.c:25
int image_linesize
Definition: pngdec.c:82
int extradata_size
Definition: avcodec.h:628
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, int size)
Add a new side data to a frame.
Definition: frame.c:739
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:1592
Y , 16bpp, big-endian.
Definition: pixfmt.h:97
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
Definition: vf_neighbor.c:198
Rational number (pair of numerator and denominator).
Definition: rational.h:58
Mastering display metadata capable of representing the color volume of the display used to master the...
int cur_w
Definition: pngdec.c:64
uint8_t transparent_color_be[6]
Definition: pngdec.c:79
#define OP_AVG(x, s, l)
#define AV_EF_IGNORE_ERR
ignore errors and continue
Definition: avcodec.h:1668
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
Definition: avcodec.h:1663
uint8_t * image_buf
Definition: pngdec.c:81
uint8_t dispose_op
Definition: pngdec.c:68
AVRational display_primaries[3][2]
CIE 1931 xy chromaticity coords of color primaries (r, g, b order).
uint8_t pixel
Definition: tiny_ssim.c:42
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:566
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int last_x_offset
Definition: pngdec.c:67
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:322
#define FAST_DIV255(x)
Definition: pngdec.c:1070
static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1072
#define YUV2RGB(NAME, TYPE)
Definition: pngdec.c:310
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
static const uint8_t png_pass_mask[NB_PASSES]
Definition: pngdec.c:100
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:76
Y , 8bpp.
Definition: pixfmt.h:74
static av_cold int png_dec_end(AVCodecContext *avctx)
Definition: pngdec.c:1805
void(* add_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdsp.h:33
common internal api header.
static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:900
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
#define PNG_FILTER_VALUE_NONE
Definition: png.h:38
static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:807
packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big...
Definition: pixfmt.h:102
int last_w
Definition: pngdec.c:65
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call...
Definition: utils.c:84
static const uint8_t png_pass_dsp_ymask[NB_PASSES]
Definition: pngdec.c:105
Stereoscopic video.
int den
Denominator.
Definition: rational.h:60
void ff_png_zfree(void *opaque, void *ptr)
Definition: png.c:44
void * priv_data
Definition: avcodec.h:553
static int png_decode_idat(PNGDecContext *s, int length)
Definition: pngdec.c:415
uint8_t * buffer
Definition: pngdec.c:89
#define av_free(p)
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:1625
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:386
int row_size
Definition: pngdec.c:93
APNG common header.
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:208
PNGDSPContext dsp
Definition: pngdec.c:53
int compression_type
Definition: pngdec.c:72
int last_h
Definition: pngdec.c:65
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
Definition: png.c:62
int height
Definition: frame.h:366
FILE * out
Definition: movenc.c:54
int bit_depth
Definition: pngdec.c:70
#define av_freep(p)
int color_type
Definition: pngdec.c:71
ThreadFrame last_picture
Definition: pngdec.c:58
#define av_malloc_array(a, b)
static void png_put_interlaced_row(uint8_t *dst, int width, int bits_per_pixel, int pass, int color_type, const uint8_t *src)
Definition: pngdec.c:117
#define FFSWAP(type, a, b)
Definition: common.h:99
int crow_size
Definition: pngdec.c:92
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2489
static void decode_flush(AVCodecContext *avctx)
Definition: agm.c:1261
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
int x_offset
Definition: pngdec.c:66
#define MKTAG(a, b, c, d)
Definition: common.h:406
void * ff_png_zalloc(void *opaque, unsigned int items, unsigned int size)
Definition: png.c:39
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: packet.h:340
int has_trns
Definition: pngdec.c:78
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:509
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
uint32_t AVCRC
Definition: crc.h:47
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1589
AVCodec ff_png_decoder
int i
Definition: input.c:407
Predicted.
Definition: avutil.h:275
#define UNROLL_FILTER(op)
Definition: pngdec.c:238
#define MNGSIG
Definition: png.h:48