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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/imgutils.h"
27 #include "libavutil/stereo3d.h"
28 
29 #include "avcodec.h"
30 #include "bytestream.h"
31 #include "internal.h"
32 #include "apng.h"
33 #include "png.h"
34 #include "pngdsp.h"
35 #include "thread.h"
36 
37 #include <zlib.h>
38 
40  PNG_IHDR = 1 << 0,
41  PNG_PLTE = 1 << 1,
42 };
43 
45  PNG_IDAT = 1 << 0,
46  PNG_ALLIMAGE = 1 << 1,
47 };
48 
49 typedef struct PNGDecContext {
52 
57 
60  int width, height;
61  int cur_w, cur_h;
62  int last_w, last_h;
67  int bit_depth;
72  int channels;
74  int bpp;
75  int has_trns;
77 
80  uint32_t palette[256];
83  unsigned int last_row_size;
85  unsigned int tmp_row_size;
88  int pass;
89  int crow_size; /* compressed row size (include filter type) */
90  int row_size; /* decompressed row size */
91  int pass_row_size; /* decompress row size of the current pass */
92  int y;
93  z_stream zstream;
95 
96 /* Mask to determine which pixels are valid in a pass */
97 static const uint8_t png_pass_mask[NB_PASSES] = {
98  0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
99 };
100 
101 /* Mask to determine which y pixels can be written in a pass */
103  0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
104 };
105 
106 /* Mask to determine which pixels to overwrite while displaying */
108  0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
109 };
110 
111 /* NOTE: we try to construct a good looking image at each pass. width
112  * is the original image width. We also do pixel format conversion at
113  * this stage */
114 static void png_put_interlaced_row(uint8_t *dst, int width,
115  int bits_per_pixel, int pass,
116  int color_type, const uint8_t *src)
117 {
118  int x, mask, dsp_mask, j, src_x, b, bpp;
119  uint8_t *d;
120  const uint8_t *s;
121 
122  mask = png_pass_mask[pass];
123  dsp_mask = png_pass_dsp_mask[pass];
124 
125  switch (bits_per_pixel) {
126  case 1:
127  src_x = 0;
128  for (x = 0; x < width; x++) {
129  j = (x & 7);
130  if ((dsp_mask << j) & 0x80) {
131  b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
132  dst[x >> 3] &= 0xFF7F>>j;
133  dst[x >> 3] |= b << (7 - j);
134  }
135  if ((mask << j) & 0x80)
136  src_x++;
137  }
138  break;
139  case 2:
140  src_x = 0;
141  for (x = 0; x < width; x++) {
142  int j2 = 2 * (x & 3);
143  j = (x & 7);
144  if ((dsp_mask << j) & 0x80) {
145  b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
146  dst[x >> 2] &= 0xFF3F>>j2;
147  dst[x >> 2] |= b << (6 - j2);
148  }
149  if ((mask << j) & 0x80)
150  src_x++;
151  }
152  break;
153  case 4:
154  src_x = 0;
155  for (x = 0; x < width; x++) {
156  int j2 = 4*(x&1);
157  j = (x & 7);
158  if ((dsp_mask << j) & 0x80) {
159  b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
160  dst[x >> 1] &= 0xFF0F>>j2;
161  dst[x >> 1] |= b << (4 - j2);
162  }
163  if ((mask << j) & 0x80)
164  src_x++;
165  }
166  break;
167  default:
168  bpp = bits_per_pixel >> 3;
169  d = dst;
170  s = src;
171  for (x = 0; x < width; x++) {
172  j = x & 7;
173  if ((dsp_mask << j) & 0x80) {
174  memcpy(d, s, bpp);
175  }
176  d += bpp;
177  if ((mask << j) & 0x80)
178  s += bpp;
179  }
180  break;
181  }
182 }
183 
185  int w, int bpp)
186 {
187  int i;
188  for (i = 0; i < w; i++) {
189  int a, b, c, p, pa, pb, pc;
190 
191  a = dst[i - bpp];
192  b = top[i];
193  c = top[i - bpp];
194 
195  p = b - c;
196  pc = a - c;
197 
198  pa = abs(p);
199  pb = abs(pc);
200  pc = abs(p + pc);
201 
202  if (pa <= pb && pa <= pc)
203  p = a;
204  else if (pb <= pc)
205  p = b;
206  else
207  p = c;
208  dst[i] = p + src[i];
209  }
210 }
211 
212 #define UNROLL1(bpp, op) \
213  { \
214  r = dst[0]; \
215  if (bpp >= 2) \
216  g = dst[1]; \
217  if (bpp >= 3) \
218  b = dst[2]; \
219  if (bpp >= 4) \
220  a = dst[3]; \
221  for (; i <= size - bpp; i += bpp) { \
222  dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
223  if (bpp == 1) \
224  continue; \
225  dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
226  if (bpp == 2) \
227  continue; \
228  dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
229  if (bpp == 3) \
230  continue; \
231  dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
232  } \
233  }
234 
235 #define UNROLL_FILTER(op) \
236  if (bpp == 1) { \
237  UNROLL1(1, op) \
238  } else if (bpp == 2) { \
239  UNROLL1(2, op) \
240  } else if (bpp == 3) { \
241  UNROLL1(3, op) \
242  } else if (bpp == 4) { \
243  UNROLL1(4, op) \
244  } \
245  for (; i < size; i++) { \
246  dst[i] = op(dst[i - bpp], src[i], last[i]); \
247  }
248 
249 /* NOTE: 'dst' can be equal to 'last' */
250 static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
251  uint8_t *src, uint8_t *last, int size, int bpp)
252 {
253  int i, p, r, g, b, a;
254 
255  switch (filter_type) {
257  memcpy(dst, src, size);
258  break;
260  for (i = 0; i < bpp; i++)
261  dst[i] = src[i];
262  if (bpp == 4) {
263  p = *(int *)dst;
264  for (; i < size; i += bpp) {
265  unsigned s = *(int *)(src + i);
266  p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
267  *(int *)(dst + i) = p;
268  }
269  } else {
270 #define OP_SUB(x, s, l) ((x) + (s))
272  }
273  break;
274  case PNG_FILTER_VALUE_UP:
275  dsp->add_bytes_l2(dst, src, last, size);
276  break;
278  for (i = 0; i < bpp; i++) {
279  p = (last[i] >> 1);
280  dst[i] = p + src[i];
281  }
282 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
284  break;
286  for (i = 0; i < bpp; i++) {
287  p = last[i];
288  dst[i] = p + src[i];
289  }
290  if (bpp > 2 && size > 4) {
291  /* would write off the end of the array if we let it process
292  * the last pixel with bpp=3 */
293  int w = (bpp & 3) ? size - 3 : size;
294 
295  if (w > i) {
296  dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
297  i = w;
298  }
299  }
300  ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
301  break;
302  }
303 }
304 
305 /* This used to be called "deloco" in FFmpeg
306  * and is actually an inverse reversible colorspace transformation */
307 #define YUV2RGB(NAME, TYPE) \
308 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
309 { \
310  int i; \
311  for (i = 0; i < size; i += 3 + alpha) { \
312  int g = dst [i + 1]; \
313  dst[i + 0] += g; \
314  dst[i + 2] += g; \
315  } \
316 }
317 
318 YUV2RGB(rgb8, uint8_t)
319 YUV2RGB(rgb16, uint16_t)
320 
321 /* process exactly one decompressed row */
323 {
324  uint8_t *ptr, *last_row;
325  int got_line;
326 
327  if (!s->interlace_type) {
328  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
329  if (s->y == 0)
330  last_row = s->last_row;
331  else
332  last_row = ptr - s->image_linesize;
333 
334  png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
335  last_row, s->row_size, s->bpp);
336  /* loco lags by 1 row so that it doesn't interfere with top prediction */
337  if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
338  if (s->bit_depth == 16) {
339  deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2,
340  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
341  } else {
342  deloco_rgb8(ptr - s->image_linesize, s->row_size,
343  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
344  }
345  }
346  s->y++;
347  if (s->y == s->cur_h) {
348  s->pic_state |= PNG_ALLIMAGE;
349  if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
350  if (s->bit_depth == 16) {
351  deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
352  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
353  } else {
354  deloco_rgb8(ptr, s->row_size,
355  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
356  }
357  }
358  }
359  } else {
360  got_line = 0;
361  for (;;) {
362  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
363  if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
364  /* if we already read one row, it is time to stop to
365  * wait for the next one */
366  if (got_line)
367  break;
368  png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
369  s->last_row, s->pass_row_size, s->bpp);
370  FFSWAP(uint8_t *, s->last_row, s->tmp_row);
371  FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
372  got_line = 1;
373  }
374  if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
375  png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
376  s->color_type, s->last_row);
377  }
378  s->y++;
379  if (s->y == s->cur_h) {
380  memset(s->last_row, 0, s->row_size);
381  for (;;) {
382  if (s->pass == NB_PASSES - 1) {
383  s->pic_state |= PNG_ALLIMAGE;
384  goto the_end;
385  } else {
386  s->pass++;
387  s->y = 0;
388  s->pass_row_size = ff_png_pass_row_size(s->pass,
389  s->bits_per_pixel,
390  s->cur_w);
391  s->crow_size = s->pass_row_size + 1;
392  if (s->pass_row_size != 0)
393  break;
394  /* skip pass if empty row */
395  }
396  }
397  }
398  }
399 the_end:;
400  }
401 }
402 
404 {
405  int ret;
406  s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
407  s->zstream.next_in = (unsigned char *)s->gb.buffer;
408  bytestream2_skip(&s->gb, length);
409 
410  /* decode one line if possible */
411  while (s->zstream.avail_in > 0) {
412  ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
413  if (ret != Z_OK && ret != Z_STREAM_END) {
414  av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
415  return AVERROR_EXTERNAL;
416  }
417  if (s->zstream.avail_out == 0) {
418  if (!(s->pic_state & PNG_ALLIMAGE)) {
419  png_handle_row(s);
420  }
421  s->zstream.avail_out = s->crow_size;
422  s->zstream.next_out = s->crow_buf;
423  }
424  if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
426  "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
427  return 0;
428  }
429  }
430  return 0;
431 }
432 
433 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
434  const uint8_t *data_end)
435 {
436  z_stream zstream;
437  unsigned char *buf;
438  unsigned buf_size;
439  int ret;
440 
441  zstream.zalloc = ff_png_zalloc;
442  zstream.zfree = ff_png_zfree;
443  zstream.opaque = NULL;
444  if (inflateInit(&zstream) != Z_OK)
445  return AVERROR_EXTERNAL;
446  zstream.next_in = (unsigned char *)data;
447  zstream.avail_in = data_end - data;
448  av_bprint_init(bp, 0, -1);
449 
450  while (zstream.avail_in > 0) {
451  av_bprint_get_buffer(bp, 2, &buf, &buf_size);
452  if (buf_size < 2) {
453  ret = AVERROR(ENOMEM);
454  goto fail;
455  }
456  zstream.next_out = buf;
457  zstream.avail_out = buf_size - 1;
458  ret = inflate(&zstream, Z_PARTIAL_FLUSH);
459  if (ret != Z_OK && ret != Z_STREAM_END) {
460  ret = AVERROR_EXTERNAL;
461  goto fail;
462  }
463  bp->len += zstream.next_out - buf;
464  if (ret == Z_STREAM_END)
465  break;
466  }
467  inflateEnd(&zstream);
468  bp->str[bp->len] = 0;
469  return 0;
470 
471 fail:
472  inflateEnd(&zstream);
474  return ret;
475 }
476 
477 static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
478 {
479  size_t extra = 0, i;
480  uint8_t *out, *q;
481 
482  for (i = 0; i < size_in; i++)
483  extra += in[i] >= 0x80;
484  if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
485  return NULL;
486  q = out = av_malloc(size_in + extra + 1);
487  if (!out)
488  return NULL;
489  for (i = 0; i < size_in; i++) {
490  if (in[i] >= 0x80) {
491  *(q++) = 0xC0 | (in[i] >> 6);
492  *(q++) = 0x80 | (in[i] & 0x3F);
493  } else {
494  *(q++) = in[i];
495  }
496  }
497  *(q++) = 0;
498  return out;
499 }
500 
501 static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed,
502  AVDictionary **dict)
503 {
504  int ret, method;
505  const uint8_t *data = s->gb.buffer;
506  const uint8_t *data_end = data + length;
507  const uint8_t *keyword = data;
508  const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
509  uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
510  unsigned text_len;
511  AVBPrint bp;
512 
513  if (!keyword_end)
514  return AVERROR_INVALIDDATA;
515  data = keyword_end + 1;
516 
517  if (compressed) {
518  if (data == data_end)
519  return AVERROR_INVALIDDATA;
520  method = *(data++);
521  if (method)
522  return AVERROR_INVALIDDATA;
523  if ((ret = decode_zbuf(&bp, data, data_end)) < 0)
524  return ret;
525  text_len = bp.len;
526  av_bprint_finalize(&bp, (char **)&text);
527  if (!text)
528  return AVERROR(ENOMEM);
529  } else {
530  text = (uint8_t *)data;
531  text_len = data_end - text;
532  }
533 
534  kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
535  txt_utf8 = iso88591_to_utf8(text, text_len);
536  if (text != data)
537  av_free(text);
538  if (!(kw_utf8 && txt_utf8)) {
539  av_free(kw_utf8);
540  av_free(txt_utf8);
541  return AVERROR(ENOMEM);
542  }
543 
544  av_dict_set(dict, kw_utf8, txt_utf8,
546  return 0;
547 }
548 
550  uint32_t length)
551 {
552  if (length != 13)
553  return AVERROR_INVALIDDATA;
554 
555  if (s->pic_state & PNG_IDAT) {
556  av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
557  return AVERROR_INVALIDDATA;
558  }
559 
560  if (s->hdr_state & PNG_IHDR) {
561  av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
562  return AVERROR_INVALIDDATA;
563  }
564 
565  s->width = s->cur_w = bytestream2_get_be32(&s->gb);
566  s->height = s->cur_h = bytestream2_get_be32(&s->gb);
567  if (av_image_check_size(s->width, s->height, 0, avctx)) {
568  s->cur_w = s->cur_h = s->width = s->height = 0;
569  av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
570  return AVERROR_INVALIDDATA;
571  }
572  s->bit_depth = bytestream2_get_byte(&s->gb);
573  if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
574  s->bit_depth != 8 && s->bit_depth != 16) {
575  av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
576  goto error;
577  }
578  s->color_type = bytestream2_get_byte(&s->gb);
579  s->compression_type = bytestream2_get_byte(&s->gb);
580  s->filter_type = bytestream2_get_byte(&s->gb);
581  s->interlace_type = bytestream2_get_byte(&s->gb);
582  bytestream2_skip(&s->gb, 4); /* crc */
583  s->hdr_state |= PNG_IHDR;
584  if (avctx->debug & FF_DEBUG_PICT_INFO)
585  av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
586  "compression_type=%d filter_type=%d interlace_type=%d\n",
587  s->width, s->height, s->bit_depth, s->color_type,
589 
590  return 0;
591 error:
592  s->cur_w = s->cur_h = s->width = s->height = 0;
593  s->bit_depth = 8;
594  return AVERROR_INVALIDDATA;
595 }
596 
598 {
599  if (s->pic_state & PNG_IDAT) {
600  av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
601  return AVERROR_INVALIDDATA;
602  }
603  avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb);
604  avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb);
605  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
606  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
607  bytestream2_skip(&s->gb, 1); /* unit specifier */
608  bytestream2_skip(&s->gb, 4); /* crc */
609 
610  return 0;
611 }
612 
614  uint32_t length, AVFrame *p)
615 {
616  int ret;
617  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
618 
619  if (!(s->hdr_state & PNG_IHDR)) {
620  av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
621  return AVERROR_INVALIDDATA;
622  }
623  if (!(s->pic_state & PNG_IDAT)) {
624  /* init image info */
625  ret = ff_set_dimensions(avctx, s->width, s->height);
626  if (ret < 0)
627  return ret;
628 
630  s->bits_per_pixel = s->bit_depth * s->channels;
631  s->bpp = (s->bits_per_pixel + 7) >> 3;
632  s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
633 
634  if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
636  avctx->pix_fmt = AV_PIX_FMT_RGB24;
637  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
639  avctx->pix_fmt = AV_PIX_FMT_RGBA;
640  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
642  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
643  } else if (s->bit_depth == 16 &&
645  avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
646  } else if (s->bit_depth == 16 &&
648  avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
649  } else if (s->bit_depth == 16 &&
651  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
652  } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
654  avctx->pix_fmt = AV_PIX_FMT_PAL8;
655  } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
656  avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
657  } else if (s->bit_depth == 8 &&
659  avctx->pix_fmt = AV_PIX_FMT_YA8;
660  } else if (s->bit_depth == 16 &&
662  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
663  } else {
664  av_log(avctx, AV_LOG_ERROR, "unsupported bit depth %d "
665  "and color type %d\n",
666  s->bit_depth, s->color_type);
667  return AVERROR_INVALIDDATA;
668  }
669 
670  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
671  switch (avctx->pix_fmt) {
672  case AV_PIX_FMT_RGB24:
673  avctx->pix_fmt = AV_PIX_FMT_RGBA;
674  break;
675 
676  case AV_PIX_FMT_RGB48BE:
677  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
678  break;
679 
680  case AV_PIX_FMT_GRAY8:
681  avctx->pix_fmt = AV_PIX_FMT_YA8;
682  break;
683 
684  case AV_PIX_FMT_GRAY16BE:
685  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
686  break;
687 
688  default:
689  avpriv_request_sample(avctx, "bit depth %d "
690  "and color type %d with TRNS",
691  s->bit_depth, s->color_type);
692  return AVERROR_INVALIDDATA;
693  }
694 
695  s->bpp += byte_depth;
696  }
697 
698  if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
699  return ret;
702  if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
703  return ret;
704  }
706  p->key_frame = 1;
708 
709  ff_thread_finish_setup(avctx);
710 
711  /* compute the compressed row size */
712  if (!s->interlace_type) {
713  s->crow_size = s->row_size + 1;
714  } else {
715  s->pass = 0;
717  s->bits_per_pixel,
718  s->cur_w);
719  s->crow_size = s->pass_row_size + 1;
720  }
721  ff_dlog(avctx, "row_size=%d crow_size =%d\n",
722  s->row_size, s->crow_size);
723  s->image_buf = p->data[0];
724  s->image_linesize = p->linesize[0];
725  /* copy the palette if needed */
726  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
727  memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
728  /* empty row is used if differencing to the first row */
730  if (!s->last_row)
731  return AVERROR_INVALIDDATA;
732  if (s->interlace_type ||
735  if (!s->tmp_row)
736  return AVERROR_INVALIDDATA;
737  }
738  /* compressed row */
740  if (!s->buffer)
741  return AVERROR(ENOMEM);
742 
743  /* we want crow_buf+1 to be 16-byte aligned */
744  s->crow_buf = s->buffer + 15;
745  s->zstream.avail_out = s->crow_size;
746  s->zstream.next_out = s->crow_buf;
747  }
748 
749  s->pic_state |= PNG_IDAT;
750 
751  /* set image to non-transparent bpp while decompressing */
753  s->bpp -= byte_depth;
754 
755  ret = png_decode_idat(s, length);
756 
758  s->bpp += byte_depth;
759 
760  if (ret < 0)
761  return ret;
762 
763  bytestream2_skip(&s->gb, 4); /* crc */
764 
765  return 0;
766 }
767 
769  uint32_t length)
770 {
771  int n, i, r, g, b;
772 
773  if ((length % 3) != 0 || length > 256 * 3)
774  return AVERROR_INVALIDDATA;
775  /* read the palette */
776  n = length / 3;
777  for (i = 0; i < n; i++) {
778  r = bytestream2_get_byte(&s->gb);
779  g = bytestream2_get_byte(&s->gb);
780  b = bytestream2_get_byte(&s->gb);
781  s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
782  }
783  for (; i < 256; i++)
784  s->palette[i] = (0xFFU << 24);
785  s->hdr_state |= PNG_PLTE;
786  bytestream2_skip(&s->gb, 4); /* crc */
787 
788  return 0;
789 }
790 
792  uint32_t length)
793 {
794  int v, i;
795 
796  if (!(s->hdr_state & PNG_IHDR)) {
797  av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
798  return AVERROR_INVALIDDATA;
799  }
800 
801  if (s->pic_state & PNG_IDAT) {
802  av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
803  return AVERROR_INVALIDDATA;
804  }
805 
807  if (length > 256 || !(s->hdr_state & PNG_PLTE))
808  return AVERROR_INVALIDDATA;
809 
810  for (i = 0; i < length; i++) {
811  unsigned v = bytestream2_get_byte(&s->gb);
812  s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
813  }
814  } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
815  if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
816  (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
817  s->bit_depth == 1)
818  return AVERROR_INVALIDDATA;
819 
820  for (i = 0; i < length / 2; i++) {
821  /* only use the least significant bits */
822  v = av_mod_uintp2(bytestream2_get_be16(&s->gb), s->bit_depth);
823 
824  if (s->bit_depth > 8)
825  AV_WB16(&s->transparent_color_be[2 * i], v);
826  else
827  s->transparent_color_be[i] = v;
828  }
829  } else {
830  return AVERROR_INVALIDDATA;
831  }
832 
833  bytestream2_skip(&s->gb, 4); /* crc */
834  s->has_trns = 1;
835 
836  return 0;
837 }
838 
840 {
841  int ret, cnt = 0;
842  uint8_t *data, profile_name[82];
843  AVBPrint bp;
844  AVFrameSideData *sd;
845 
846  while ((profile_name[cnt++] = bytestream2_get_byte(&s->gb)) && cnt < 81);
847  if (cnt > 80) {
848  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
849  return AVERROR_INVALIDDATA;
850  }
851 
852  length = FFMAX(length - cnt, 0);
853 
854  if (bytestream2_get_byte(&s->gb) != 0) {
855  av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
856  return AVERROR_INVALIDDATA;
857  }
858 
859  length = FFMAX(length - 1, 0);
860 
861  if ((ret = decode_zbuf(&bp, s->gb.buffer, s->gb.buffer + length) < 0))
862  return ret;
863 
864  av_bprint_finalize(&bp, (char **)&data);
865 
867  if (!sd) {
868  av_free(data);
869  return AVERROR(ENOMEM);
870  }
871 
872  av_dict_set(&sd->metadata, "name", profile_name, 0);
873  memcpy(sd->data, data, bp.len);
874  av_free(data);
875 
876  /* ICC compressed data and CRC */
877  bytestream2_skip(&s->gb, length + 4);
878 
879  return 0;
880 }
881 
883 {
884  if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
885  int i, j, k;
886  uint8_t *pd = p->data[0];
887  for (j = 0; j < s->height; j++) {
888  i = s->width / 8;
889  for (k = 7; k >= 1; k--)
890  if ((s->width&7) >= k)
891  pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
892  for (i--; i >= 0; i--) {
893  pd[8*i + 7]= pd[i] & 1;
894  pd[8*i + 6]= (pd[i]>>1) & 1;
895  pd[8*i + 5]= (pd[i]>>2) & 1;
896  pd[8*i + 4]= (pd[i]>>3) & 1;
897  pd[8*i + 3]= (pd[i]>>4) & 1;
898  pd[8*i + 2]= (pd[i]>>5) & 1;
899  pd[8*i + 1]= (pd[i]>>6) & 1;
900  pd[8*i + 0]= pd[i]>>7;
901  }
902  pd += s->image_linesize;
903  }
904  } else if (s->bits_per_pixel == 2) {
905  int i, j;
906  uint8_t *pd = p->data[0];
907  for (j = 0; j < s->height; j++) {
908  i = s->width / 4;
910  if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
911  if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
912  if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
913  for (i--; i >= 0; i--) {
914  pd[4*i + 3]= pd[i] & 3;
915  pd[4*i + 2]= (pd[i]>>2) & 3;
916  pd[4*i + 1]= (pd[i]>>4) & 3;
917  pd[4*i + 0]= pd[i]>>6;
918  }
919  } else {
920  if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
921  if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
922  if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
923  for (i--; i >= 0; i--) {
924  pd[4*i + 3]= ( pd[i] & 3)*0x55;
925  pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
926  pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
927  pd[4*i + 0]= ( pd[i]>>6 )*0x55;
928  }
929  }
930  pd += s->image_linesize;
931  }
932  } else if (s->bits_per_pixel == 4) {
933  int i, j;
934  uint8_t *pd = p->data[0];
935  for (j = 0; j < s->height; j++) {
936  i = s->width/2;
938  if (s->width&1) pd[2*i+0]= pd[i]>>4;
939  for (i--; i >= 0; i--) {
940  pd[2*i + 1] = pd[i] & 15;
941  pd[2*i + 0] = pd[i] >> 4;
942  }
943  } else {
944  if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
945  for (i--; i >= 0; i--) {
946  pd[2*i + 1] = (pd[i] & 15) * 0x11;
947  pd[2*i + 0] = (pd[i] >> 4) * 0x11;
948  }
949  }
950  pd += s->image_linesize;
951  }
952  }
953 }
954 
956  uint32_t length)
957 {
958  uint32_t sequence_number;
959  int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
960 
961  if (length != 26)
962  return AVERROR_INVALIDDATA;
963 
964  if (!(s->hdr_state & PNG_IHDR)) {
965  av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
966  return AVERROR_INVALIDDATA;
967  }
968 
969  s->last_w = s->cur_w;
970  s->last_h = s->cur_h;
971  s->last_x_offset = s->x_offset;
972  s->last_y_offset = s->y_offset;
973  s->last_dispose_op = s->dispose_op;
974 
975  sequence_number = bytestream2_get_be32(&s->gb);
976  cur_w = bytestream2_get_be32(&s->gb);
977  cur_h = bytestream2_get_be32(&s->gb);
978  x_offset = bytestream2_get_be32(&s->gb);
979  y_offset = bytestream2_get_be32(&s->gb);
980  bytestream2_skip(&s->gb, 4); /* delay_num (2), delay_den (2) */
981  dispose_op = bytestream2_get_byte(&s->gb);
982  blend_op = bytestream2_get_byte(&s->gb);
983  bytestream2_skip(&s->gb, 4); /* crc */
984 
985  if (sequence_number == 0 &&
986  (cur_w != s->width ||
987  cur_h != s->height ||
988  x_offset != 0 ||
989  y_offset != 0) ||
990  cur_w <= 0 || cur_h <= 0 ||
991  x_offset < 0 || y_offset < 0 ||
992  cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
993  return AVERROR_INVALIDDATA;
994 
995  if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
996  av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
997  return AVERROR_INVALIDDATA;
998  }
999 
1000  if ((sequence_number == 0 || !s->previous_picture.f->data[0]) &&
1001  dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1002  // No previous frame to revert to for the first frame
1003  // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1004  dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1005  }
1006 
1007  if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1008  avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1009  avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1010  avctx->pix_fmt == AV_PIX_FMT_PAL8 ||
1011  avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1012  avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1013  avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1014  )) {
1015  // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1016  blend_op = APNG_BLEND_OP_SOURCE;
1017  }
1018 
1019  s->cur_w = cur_w;
1020  s->cur_h = cur_h;
1021  s->x_offset = x_offset;
1022  s->y_offset = y_offset;
1023  s->dispose_op = dispose_op;
1024  s->blend_op = blend_op;
1025 
1026  return 0;
1027 }
1028 
1030 {
1031  int i, j;
1032  uint8_t *pd = p->data[0];
1033  uint8_t *pd_last = s->last_picture.f->data[0];
1034  int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
1035 
1036  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1037  for (j = 0; j < s->height; j++) {
1038  for (i = 0; i < ls; i++)
1039  pd[i] += pd_last[i];
1040  pd += s->image_linesize;
1041  pd_last += s->image_linesize;
1042  }
1043 }
1044 
1045 // divide by 255 and round to nearest
1046 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1047 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1048 
1050  AVFrame *p)
1051 {
1052  size_t x, y;
1053  uint8_t *buffer;
1054 
1055  if (s->blend_op == APNG_BLEND_OP_OVER &&
1056  avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1057  avctx->pix_fmt != AV_PIX_FMT_GRAY8A &&
1058  avctx->pix_fmt != AV_PIX_FMT_PAL8) {
1059  avpriv_request_sample(avctx, "Blending with pixel format %s",
1060  av_get_pix_fmt_name(avctx->pix_fmt));
1061  return AVERROR_PATCHWELCOME;
1062  }
1063 
1064  buffer = av_malloc_array(s->image_linesize, s->height);
1065  if (!buffer)
1066  return AVERROR(ENOMEM);
1067 
1068 
1069  // Do the disposal operation specified by the last frame on the frame
1071  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1072  memcpy(buffer, s->last_picture.f->data[0], s->image_linesize * s->height);
1073 
1075  for (y = s->last_y_offset; y < s->last_y_offset + s->last_h; ++y)
1076  memset(buffer + s->image_linesize * y + s->bpp * s->last_x_offset, 0, s->bpp * s->last_w);
1077 
1078  memcpy(s->previous_picture.f->data[0], buffer, s->image_linesize * s->height);
1080  } else {
1081  ff_thread_await_progress(&s->previous_picture, INT_MAX, 0);
1082  memcpy(buffer, s->previous_picture.f->data[0], s->image_linesize * s->height);
1083  }
1084 
1085  // Perform blending
1086  if (s->blend_op == APNG_BLEND_OP_SOURCE) {
1087  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1088  size_t row_start = s->image_linesize * y + s->bpp * s->x_offset;
1089  memcpy(buffer + row_start, p->data[0] + row_start, s->bpp * s->cur_w);
1090  }
1091  } else { // APNG_BLEND_OP_OVER
1092  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1093  uint8_t *foreground = p->data[0] + s->image_linesize * y + s->bpp * s->x_offset;
1094  uint8_t *background = buffer + s->image_linesize * y + s->bpp * s->x_offset;
1095  for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += s->bpp, background += s->bpp) {
1096  size_t b;
1097  uint8_t foreground_alpha, background_alpha, output_alpha;
1098  uint8_t output[10];
1099 
1100  // Since we might be blending alpha onto alpha, we use the following equations:
1101  // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1102  // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1103 
1104  switch (avctx->pix_fmt) {
1105  case AV_PIX_FMT_RGBA:
1106  foreground_alpha = foreground[3];
1107  background_alpha = background[3];
1108  break;
1109 
1110  case AV_PIX_FMT_GRAY8A:
1111  foreground_alpha = foreground[1];
1112  background_alpha = background[1];
1113  break;
1114 
1115  case AV_PIX_FMT_PAL8:
1116  foreground_alpha = s->palette[foreground[0]] >> 24;
1117  background_alpha = s->palette[background[0]] >> 24;
1118  break;
1119  }
1120 
1121  if (foreground_alpha == 0)
1122  continue;
1123 
1124  if (foreground_alpha == 255) {
1125  memcpy(background, foreground, s->bpp);
1126  continue;
1127  }
1128 
1129  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1130  // TODO: Alpha blending with PAL8 will likely need the entire image converted over to RGBA first
1131  avpriv_request_sample(avctx, "Alpha blending palette samples");
1132  background[0] = foreground[0];
1133  continue;
1134  }
1135 
1136  output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1137 
1138  av_assert0(s->bpp <= 10);
1139 
1140  for (b = 0; b < s->bpp - 1; ++b) {
1141  if (output_alpha == 0) {
1142  output[b] = 0;
1143  } else if (background_alpha == 255) {
1144  output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1145  } else {
1146  output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1147  }
1148  }
1149  output[b] = output_alpha;
1150  memcpy(background, output, s->bpp);
1151  }
1152  }
1153  }
1154 
1155  // Copy blended buffer into the frame and free
1156  memcpy(p->data[0], buffer, s->image_linesize * s->height);
1157  av_free(buffer);
1158 
1159  return 0;
1160 }
1161 
1163  AVFrame *p, AVPacket *avpkt)
1164 {
1165  AVDictionary **metadatap = NULL;
1166  uint32_t tag, length;
1167  int decode_next_dat = 0;
1168  int ret;
1169 
1170  for (;;) {
1171  length = bytestream2_get_bytes_left(&s->gb);
1172  if (length <= 0) {
1173 
1174  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1175  avctx->skip_frame == AVDISCARD_ALL) {
1176  return 0;
1177  }
1178 
1179  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1180  if (!(s->pic_state & PNG_IDAT))
1181  return 0;
1182  else
1183  goto exit_loop;
1184  }
1185  av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1186  if ( s->pic_state & PNG_ALLIMAGE
1188  goto exit_loop;
1189  ret = AVERROR_INVALIDDATA;
1190  goto fail;
1191  }
1192 
1193  length = bytestream2_get_be32(&s->gb);
1194  if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) {
1195  av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1196  ret = AVERROR_INVALIDDATA;
1197  goto fail;
1198  }
1199  tag = bytestream2_get_le32(&s->gb);
1200  if (avctx->debug & FF_DEBUG_STARTCODE)
1201  av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1202  av_fourcc2str(tag), length);
1203 
1204  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1205  avctx->skip_frame == AVDISCARD_ALL) {
1206  switch(tag) {
1207  case MKTAG('I', 'H', 'D', 'R'):
1208  case MKTAG('p', 'H', 'Y', 's'):
1209  case MKTAG('t', 'E', 'X', 't'):
1210  case MKTAG('I', 'D', 'A', 'T'):
1211  case MKTAG('t', 'R', 'N', 'S'):
1212  break;
1213  default:
1214  goto skip_tag;
1215  }
1216  }
1217 
1218  metadatap = &p->metadata;
1219  switch (tag) {
1220  case MKTAG('I', 'H', 'D', 'R'):
1221  if ((ret = decode_ihdr_chunk(avctx, s, length)) < 0)
1222  goto fail;
1223  break;
1224  case MKTAG('p', 'H', 'Y', 's'):
1225  if ((ret = decode_phys_chunk(avctx, s)) < 0)
1226  goto fail;
1227  break;
1228  case MKTAG('f', 'c', 'T', 'L'):
1229  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1230  goto skip_tag;
1231  if ((ret = decode_fctl_chunk(avctx, s, length)) < 0)
1232  goto fail;
1233  decode_next_dat = 1;
1234  break;
1235  case MKTAG('f', 'd', 'A', 'T'):
1236  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1237  goto skip_tag;
1238  if (!decode_next_dat) {
1239  ret = AVERROR_INVALIDDATA;
1240  goto fail;
1241  }
1242  bytestream2_get_be32(&s->gb);
1243  length -= 4;
1244  /* fallthrough */
1245  case MKTAG('I', 'D', 'A', 'T'):
1246  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1247  goto skip_tag;
1248  if ((ret = decode_idat_chunk(avctx, s, length, p)) < 0)
1249  goto fail;
1250  break;
1251  case MKTAG('P', 'L', 'T', 'E'):
1252  if (decode_plte_chunk(avctx, s, length) < 0)
1253  goto skip_tag;
1254  break;
1255  case MKTAG('t', 'R', 'N', 'S'):
1256  if (decode_trns_chunk(avctx, s, length) < 0)
1257  goto skip_tag;
1258  break;
1259  case MKTAG('t', 'E', 'X', 't'):
1260  if (decode_text_chunk(s, length, 0, metadatap) < 0)
1261  av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1262  bytestream2_skip(&s->gb, length + 4);
1263  break;
1264  case MKTAG('z', 'T', 'X', 't'):
1265  if (decode_text_chunk(s, length, 1, metadatap) < 0)
1266  av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1267  bytestream2_skip(&s->gb, length + 4);
1268  break;
1269  case MKTAG('s', 'T', 'E', 'R'): {
1270  int mode = bytestream2_get_byte(&s->gb);
1272  if (!stereo3d)
1273  goto fail;
1274 
1275  if (mode == 0 || mode == 1) {
1276  stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1277  stereo3d->flags = mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1278  } else {
1279  av_log(avctx, AV_LOG_WARNING,
1280  "Unknown value in sTER chunk (%d)\n", mode);
1281  }
1282  bytestream2_skip(&s->gb, 4); /* crc */
1283  break;
1284  }
1285  case MKTAG('i', 'C', 'C', 'P'): {
1286  if (decode_iccp_chunk(s, length, p) < 0)
1287  goto fail;
1288  break;
1289  }
1290  case MKTAG('I', 'E', 'N', 'D'):
1291  if (!(s->pic_state & PNG_ALLIMAGE))
1292  av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1293  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1294  ret = AVERROR_INVALIDDATA;
1295  goto fail;
1296  }
1297  bytestream2_skip(&s->gb, 4); /* crc */
1298  goto exit_loop;
1299  default:
1300  /* skip tag */
1301 skip_tag:
1302  bytestream2_skip(&s->gb, length + 4);
1303  break;
1304  }
1305  }
1306 exit_loop:
1307 
1308  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1309  avctx->skip_frame == AVDISCARD_ALL) {
1310  return 0;
1311  }
1312 
1313  if (s->bits_per_pixel <= 4)
1314  handle_small_bpp(s, p);
1315 
1316  /* apply transparency if needed */
1317  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1318  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1319  size_t raw_bpp = s->bpp - byte_depth;
1320  unsigned x, y;
1321 
1322  av_assert0(s->bit_depth > 1);
1323 
1324  for (y = 0; y < s->height; ++y) {
1325  uint8_t *row = &s->image_buf[s->image_linesize * y];
1326 
1327  /* since we're updating in-place, we have to go from right to left */
1328  for (x = s->width; x > 0; --x) {
1329  uint8_t *pixel = &row[s->bpp * (x - 1)];
1330  memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1331 
1332  if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1333  memset(&pixel[raw_bpp], 0, byte_depth);
1334  } else {
1335  memset(&pixel[raw_bpp], 0xff, byte_depth);
1336  }
1337  }
1338  }
1339  }
1340 
1341  /* handle P-frames only if a predecessor frame is available */
1342  if (s->last_picture.f->data[0]) {
1343  if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1344  && s->last_picture.f->width == p->width
1345  && s->last_picture.f->height== p->height
1346  && s->last_picture.f->format== p->format
1347  ) {
1348  if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1349  handle_p_frame_png(s, p);
1350  else if (CONFIG_APNG_DECODER &&
1351  avctx->codec_id == AV_CODEC_ID_APNG &&
1352  (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1353  goto fail;
1354  }
1355  }
1356  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1358 
1359  return 0;
1360 
1361 fail:
1362  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1364  return ret;
1365 }
1366 
1367 #if CONFIG_PNG_DECODER
1368 static int decode_frame_png(AVCodecContext *avctx,
1369  void *data, int *got_frame,
1370  AVPacket *avpkt)
1371 {
1372  PNGDecContext *const s = avctx->priv_data;
1373  const uint8_t *buf = avpkt->data;
1374  int buf_size = avpkt->size;
1375  AVFrame *p;
1376  int64_t sig;
1377  int ret;
1378 
1381  p = s->picture.f;
1382 
1383  bytestream2_init(&s->gb, buf, buf_size);
1384 
1385  /* check signature */
1386  sig = bytestream2_get_be64(&s->gb);
1387  if (sig != PNGSIG &&
1388  sig != MNGSIG) {
1389  av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1390  return AVERROR_INVALIDDATA;
1391  }
1392 
1393  s->y = s->has_trns = 0;
1394  s->hdr_state = 0;
1395  s->pic_state = 0;
1396 
1397  /* init the zlib */
1398  s->zstream.zalloc = ff_png_zalloc;
1399  s->zstream.zfree = ff_png_zfree;
1400  s->zstream.opaque = NULL;
1401  ret = inflateInit(&s->zstream);
1402  if (ret != Z_OK) {
1403  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1404  return AVERROR_EXTERNAL;
1405  }
1406 
1407  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1408  goto the_end;
1409 
1410  if (avctx->skip_frame == AVDISCARD_ALL) {
1411  *got_frame = 0;
1412  ret = bytestream2_tell(&s->gb);
1413  goto the_end;
1414  }
1415 
1416  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1417  return ret;
1418 
1419  *got_frame = 1;
1420 
1421  ret = bytestream2_tell(&s->gb);
1422 the_end:
1423  inflateEnd(&s->zstream);
1424  s->crow_buf = NULL;
1425  return ret;
1426 }
1427 #endif
1428 
1429 #if CONFIG_APNG_DECODER
1430 static int decode_frame_apng(AVCodecContext *avctx,
1431  void *data, int *got_frame,
1432  AVPacket *avpkt)
1433 {
1434  PNGDecContext *const s = avctx->priv_data;
1435  int ret;
1436  AVFrame *p;
1437 
1440  p = s->picture.f;
1441 
1442  if (!(s->hdr_state & PNG_IHDR)) {
1443  if (!avctx->extradata_size)
1444  return AVERROR_INVALIDDATA;
1445 
1446  /* only init fields, there is no zlib use in extradata */
1447  s->zstream.zalloc = ff_png_zalloc;
1448  s->zstream.zfree = ff_png_zfree;
1449 
1450  bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1451  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1452  goto end;
1453  }
1454 
1455  /* reset state for a new frame */
1456  if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1457  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1458  ret = AVERROR_EXTERNAL;
1459  goto end;
1460  }
1461  s->y = 0;
1462  s->pic_state = 0;
1463  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1464  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1465  goto end;
1466 
1467  if (!(s->pic_state & PNG_ALLIMAGE))
1468  av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1469  if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1470  ret = AVERROR_INVALIDDATA;
1471  goto end;
1472  }
1473  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1474  goto end;
1475 
1476  *got_frame = 1;
1477  ret = bytestream2_tell(&s->gb);
1478 
1479 end:
1480  inflateEnd(&s->zstream);
1481  return ret;
1482 }
1483 #endif
1484 
1485 #if HAVE_THREADS
1486 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1487 {
1488  PNGDecContext *psrc = src->priv_data;
1489  PNGDecContext *pdst = dst->priv_data;
1490  int ret;
1491 
1492  if (dst == src)
1493  return 0;
1494 
1495  ff_thread_release_buffer(dst, &pdst->picture);
1496  if (psrc->picture.f->data[0] &&
1497  (ret = ff_thread_ref_frame(&pdst->picture, &psrc->picture)) < 0)
1498  return ret;
1499  if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1500  pdst->width = psrc->width;
1501  pdst->height = psrc->height;
1502  pdst->bit_depth = psrc->bit_depth;
1503  pdst->color_type = psrc->color_type;
1504  pdst->compression_type = psrc->compression_type;
1505  pdst->interlace_type = psrc->interlace_type;
1506  pdst->filter_type = psrc->filter_type;
1507  pdst->cur_w = psrc->cur_w;
1508  pdst->cur_h = psrc->cur_h;
1509  pdst->x_offset = psrc->x_offset;
1510  pdst->y_offset = psrc->y_offset;
1511  pdst->has_trns = psrc->has_trns;
1512  memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1513 
1514  pdst->dispose_op = psrc->dispose_op;
1515 
1516  memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1517 
1518  pdst->hdr_state |= psrc->hdr_state;
1519 
1521  if (psrc->last_picture.f->data[0] &&
1522  (ret = ff_thread_ref_frame(&pdst->last_picture, &psrc->last_picture)) < 0)
1523  return ret;
1524 
1526  if (psrc->previous_picture.f->data[0] &&
1527  (ret = ff_thread_ref_frame(&pdst->previous_picture, &psrc->previous_picture)) < 0)
1528  return ret;
1529  }
1530 
1531  return 0;
1532 }
1533 #endif
1534 
1536 {
1537  PNGDecContext *s = avctx->priv_data;
1538 
1539  avctx->color_range = AVCOL_RANGE_JPEG;
1540 
1541  s->avctx = avctx;
1543  s->last_picture.f = av_frame_alloc();
1544  s->picture.f = av_frame_alloc();
1545  if (!s->previous_picture.f || !s->last_picture.f || !s->picture.f) {
1548  av_frame_free(&s->picture.f);
1549  return AVERROR(ENOMEM);
1550  }
1551 
1552  if (!avctx->internal->is_copy) {
1553  avctx->internal->allocate_progress = 1;
1554  ff_pngdsp_init(&s->dsp);
1555  }
1556 
1557  return 0;
1558 }
1559 
1561 {
1562  PNGDecContext *s = avctx->priv_data;
1563 
1568  ff_thread_release_buffer(avctx, &s->picture);
1569  av_frame_free(&s->picture.f);
1570  av_freep(&s->buffer);
1571  s->buffer_size = 0;
1572  av_freep(&s->last_row);
1573  s->last_row_size = 0;
1574  av_freep(&s->tmp_row);
1575  s->tmp_row_size = 0;
1576 
1577  return 0;
1578 }
1579 
1580 #if CONFIG_APNG_DECODER
1581 AVCodec ff_apng_decoder = {
1582  .name = "apng",
1583  .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1584  .type = AVMEDIA_TYPE_VIDEO,
1585  .id = AV_CODEC_ID_APNG,
1586  .priv_data_size = sizeof(PNGDecContext),
1587  .init = png_dec_init,
1588  .close = png_dec_end,
1589  .decode = decode_frame_apng,
1591  .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1592  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1593  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1594 };
1595 #endif
1596 
1597 #if CONFIG_PNG_DECODER
1598 AVCodec ff_png_decoder = {
1599  .name = "png",
1600  .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1601  .type = AVMEDIA_TYPE_VIDEO,
1602  .id = AV_CODEC_ID_PNG,
1603  .priv_data_size = sizeof(PNGDecContext),
1604  .init = png_dec_init,
1605  .close = png_dec_end,
1606  .decode = decode_frame_png,
1608  .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1609  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1611 };
1612 #endif
#define AV_STEREO3D_FLAG_INVERT
Inverted views, Right/Bottom represents the left view.
Definition: stereo3d.h:148
static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length, AVFrame *p)
Definition: pngdec.c:613
static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:955
#define PNG_FILTER_VALUE_AVG
Definition: png.h:41
static void png_handle_row(PNGDecContext *s)
Definition: pngdec.c:322
ThreadFrame previous_picture
Definition: pngdec.c:54
#define NULL
Definition: coverity.c:32
int last_y_offset
Definition: pngdec.c:64
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
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int width
Definition: pngdec.c:60
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
unsigned int tmp_row_size
Definition: pngdec.c:85
8 bits gray, 8 bits alpha
Definition: pixfmt.h:154
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
static int init_thread_copy(AVCodecContext *avctx)
Definition: tta.c:392
AVFrame * f
Definition: thread.h:36
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:64
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:211
const char * g
Definition: vf_curves.c:112
int pass_row_size
Definition: pngdec.c:91
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVDictionary * metadata
Definition: frame.h:167
uint8_t * tmp_row
Definition: pngdec.c:84
void(* add_bytes_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition: pngdsp.h:28
PNGHeaderState
Definition: pngdec.c:39
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2483
int num
Numerator.
Definition: rational.h:59
static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed, AVDictionary **dict)
Definition: pngdec.c:501
int size
Definition: avcodec.h:1672
const char * b
Definition: vf_curves.c:113
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:2157
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1974
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:121
enum PNGImageState pic_state
Definition: pngdec.c:59
discard all
Definition: avcodec.h:829
Views are next to each other.
Definition: stereo3d.h:67
#define PNG_COLOR_TYPE_RGB
Definition: png.h:33
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
Wait for earlier decoding threads to finish reference pictures.
#define PNG_COLOR_TYPE_GRAY_ALPHA
Definition: png.h:35
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3722
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
#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:71
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdec.c:184
#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:73
#define PNG_FILTER_VALUE_PAETH
Definition: png.h:42
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:3369
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#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:63
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:150
#define PNG_COLOR_TYPE_RGB_ALPHA
Definition: png.h:34
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
Stereo 3D type: this structure describes how two videos are packed within a single video surface...
Definition: stereo3d.h:157
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2988
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
Multithreading support functions.
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:217
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:392
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1861
static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s)
Definition: pngdec.c:597
Structure to hold side data for an AVFrame.
Definition: frame.h:163
uint8_t * data
Definition: avcodec.h:1671
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)
Definition: vf_neighbor.c:129
const uint8_t * buffer
Definition: bytestream.h:34
uint32_t tag
Definition: movenc.c:1407
int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
Definition: utils.c:2060
#define ff_dlog(a,...)
AVDictionary * metadata
metadata.
Definition: frame.h:488
static int decode_iccp_chunk(PNGDecContext *s, int length, AVFrame *f)
Definition: pngdec.c:839
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:348
ptrdiff_t size
Definition: opengl_enc.c:101
unsigned int last_row_size
Definition: pngdec.c:83
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
#define AV_WB16(p, v)
Definition: intreadwrite.h:410
int cur_h
Definition: pngdec.c:61
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1703
static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:768
#define U(x)
Definition: vp56_arith.h:37
void(* add_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdsp.h:33
int width
Definition: frame.h:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static const uint8_t png_pass_dsp_mask[NB_PASSES]
Definition: pngdec.c:107
int flags
Additional information about the frame packing.
Definition: stereo3d.h:166
16 bits gray, 16 bits alpha (big-endian)
Definition: pixfmt.h:226
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:1162
static const uint16_t mask[17]
Definition: lzw.c:38
#define OP_SUB(x, s, l)
int is_copy
Whether the parent AVCodecContext is a copy of the context which had init() called on it...
Definition: internal.h:127
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:163
static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1029
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
uint8_t * crow_buf
Definition: pngdec.c:81
const char * r
Definition: vf_curves.c:111
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int pass
Definition: pngdec.c:88
int ff_png_get_nb_channels(int color_type)
Definition: png.c:49
ThreadFrame picture
Definition: pngdec.c:56
int height
Definition: pngdec.c:60
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define PNGSIG
Definition: png.h:47
uint16_t width
Definition: gdv.c:47
simple assert() macros that are a bit more flexible than ISO C assert().
GLsizei GLsizei * length
Definition: opengl_enc.c:115
const char * name
Name of the codec implementation.
Definition: avcodec.h:3729
int bits_per_pixel
Definition: pngdec.c:73
GetByteContext gb
Definition: pngdec.c:53
#define FFMAX(a, b)
Definition: common.h:94
#define NB_PASSES
Definition: png.h:45
#define fail()
Definition: checkasm.h:98
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1064
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:94
uint8_t blend_op
Definition: pngdec.c:65
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1677
#define pass
Definition: fft_template.c:593
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:218
AVStereo3D * av_stereo3d_create_side_data(AVFrame *frame)
Allocate a complete AVFrameSideData and add it to the frame.
Definition: stereo3d.c:33
z_stream zstream
Definition: pngdec.c:93
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:281
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:157
#define FFMIN(a, b)
Definition: common.h:96
#define PNG_FILTER_VALUE_SUB
Definition: png.h:39
uint32_t palette[256]
Definition: pngdec.c:80
#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: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:250
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
Notify later decoding threads when part of their reference picture is ready.
uint8_t * last_row
Definition: pngdec.c:82
The data contains an ICC profile as an opaque octet buffer following the format described by ISO 1507...
Definition: frame.h:143
int n
Definition: avisynth_c.h:684
AVCodecContext * avctx
Definition: pngdec.c:51
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:433
static void error(const char *err)
int channels
Definition: pngdec.c:72
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:503
static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:549
static uint8_t * iso88591_to_utf8(const uint8_t *in, size_t size_in)
Definition: pngdec.c:477
#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:274
static av_cold int png_dec_init(AVCodecContext *avctx)
Definition: pngdec.c:1535
enum AVStereo3DType type
How views are packed within the video.
Definition: stereo3d.h:161
Libavcodec external API header.
enum PNGHeaderState hdr_state
Definition: pngdec.c:58
int buffer_size
Definition: pngdec.c:87
static int skip_tag(AVIOContext *in, int32_t tag_name)
Definition: ismindex.c:134
enum AVCodecID codec_id
Definition: avcodec.h:1763
#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:232
#define PNG_FILTER_TYPE_LOCO
Definition: png.h:37
uint8_t last_dispose_op
Definition: pngdec.c:66
int debug
debug
Definition: avcodec.h:2987
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:1746
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1778
uint8_t * data
Definition: frame.h:165
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;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);returnNULL;}returnac;}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;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->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);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
int interlace_type
Definition: pngdec.c:70
PNGImageState
Definition: pngdec.c:44
void * buf
Definition: avisynth_c.h:690
const uint8_t ff_png_pass_ymask[NB_PASSES]
Definition: png.c:25
int image_linesize
Definition: pngdec.c:79
int extradata_size
Definition: avcodec.h:1862
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
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, int size)
Add a new side data to a frame.
Definition: frame.c:671
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:2968
Y , 16bpp, big-endian.
Definition: pixfmt.h:98
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int cur_w
Definition: pngdec.c:61
uint8_t transparent_color_be[6]
Definition: pngdec.c:76
#define OP_AVG(x, s, l)
uint8_t * image_buf
Definition: pngdec.c:78
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:142
uint8_t dispose_op
Definition: pngdec.c:65
uint8_t pixel
Definition: tiny_ssim.c:42
int last_x_offset
Definition: pngdec.c:64
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
#define FAST_DIV255(x)
Definition: pngdec.c:1047
static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:1049
#define YUV2RGB(NAME, TYPE)
Definition: pngdec.c:307
static const uint8_t png_pass_mask[NB_PASSES]
Definition: pngdec.c:97
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:72
Y , 8bpp.
Definition: pixfmt.h:70
static av_cold int png_dec_end(AVCodecContext *avctx)
Definition: pngdec.c:1560
common internal api header.
static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:882
if(ret< 0)
Definition: vf_mcdeint.c:282
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: internal.h:60
#define PNG_FILTER_VALUE_NONE
Definition: png.h:38
static double c[64]
static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:791
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:110
int last_w
Definition: pngdec.c:62
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:133
static const uint8_t png_pass_dsp_ymask[NB_PASSES]
Definition: pngdec.c:102
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:1788
static int png_decode_idat(PNGDecContext *s, int length)
Definition: pngdec.c:403
uint8_t * buffer
Definition: pngdec.c:86
#define av_free(p)
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:3001
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1796
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
int row_size
Definition: pngdec.c:90
APNG common header.
PNGDSPContext dsp
Definition: pngdec.c:50
int compression_type
Definition: pngdec.c:69
int last_h
Definition: pngdec.c:62
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
Definition: png.c:62
int height
Definition: frame.h:259
FILE * out
Definition: movenc.c:54
int bit_depth
Definition: pngdec.c:67
#define av_freep(p)
int color_type
Definition: pngdec.c:68
ThreadFrame last_picture
Definition: pngdec.c:55
#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:114
#define FFSWAP(type, a, b)
Definition: common.h:99
int crow_size
Definition: pngdec.c:89
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:2331
int x_offset
Definition: pngdec.c:63
#define MKTAG(a, b, c, d)
Definition: common.h:342
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: avcodec.h:1648
int has_trns
Definition: pngdec.c:75
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1396
mode
Use these values in ebur128_init (or'ed).
Definition: ebur128.h:83
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:1001
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2965
GLuint buffer
Definition: opengl_enc.c:102
#define UNROLL_FILTER(op)
Definition: pngdec.c:235
#define MNGSIG
Definition: png.h:48