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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 
39 typedef struct PNGDecContext {
42 
47 
48  int state;
49  int width, height;
50  int cur_w, cur_h;
51  int last_w, last_h;
56  int bit_depth;
61  int channels;
63  int bpp;
64  int has_trns;
66 
69  uint32_t palette[256];
72  unsigned int last_row_size;
74  unsigned int tmp_row_size;
77  int pass;
78  int crow_size; /* compressed row size (include filter type) */
79  int row_size; /* decompressed row size */
80  int pass_row_size; /* decompress row size of the current pass */
81  int y;
82  z_stream zstream;
84 
85 /* Mask to determine which pixels are valid in a pass */
86 static const uint8_t png_pass_mask[NB_PASSES] = {
87  0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
88 };
89 
90 /* Mask to determine which y pixels can be written in a pass */
92  0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
93 };
94 
95 /* Mask to determine which pixels to overwrite while displaying */
97  0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
98 };
99 
100 /* NOTE: we try to construct a good looking image at each pass. width
101  * is the original image width. We also do pixel format conversion at
102  * this stage */
103 static void png_put_interlaced_row(uint8_t *dst, int width,
104  int bits_per_pixel, int pass,
105  int color_type, const uint8_t *src)
106 {
107  int x, mask, dsp_mask, j, src_x, b, bpp;
108  uint8_t *d;
109  const uint8_t *s;
110 
111  mask = png_pass_mask[pass];
112  dsp_mask = png_pass_dsp_mask[pass];
113 
114  switch (bits_per_pixel) {
115  case 1:
116  src_x = 0;
117  for (x = 0; x < width; x++) {
118  j = (x & 7);
119  if ((dsp_mask << j) & 0x80) {
120  b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
121  dst[x >> 3] &= 0xFF7F>>j;
122  dst[x >> 3] |= b << (7 - j);
123  }
124  if ((mask << j) & 0x80)
125  src_x++;
126  }
127  break;
128  case 2:
129  src_x = 0;
130  for (x = 0; x < width; x++) {
131  int j2 = 2 * (x & 3);
132  j = (x & 7);
133  if ((dsp_mask << j) & 0x80) {
134  b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
135  dst[x >> 2] &= 0xFF3F>>j2;
136  dst[x >> 2] |= b << (6 - j2);
137  }
138  if ((mask << j) & 0x80)
139  src_x++;
140  }
141  break;
142  case 4:
143  src_x = 0;
144  for (x = 0; x < width; x++) {
145  int j2 = 4*(x&1);
146  j = (x & 7);
147  if ((dsp_mask << j) & 0x80) {
148  b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
149  dst[x >> 1] &= 0xFF0F>>j2;
150  dst[x >> 1] |= b << (4 - j2);
151  }
152  if ((mask << j) & 0x80)
153  src_x++;
154  }
155  break;
156  default:
157  bpp = bits_per_pixel >> 3;
158  d = dst;
159  s = src;
160  for (x = 0; x < width; x++) {
161  j = x & 7;
162  if ((dsp_mask << j) & 0x80) {
163  memcpy(d, s, bpp);
164  }
165  d += bpp;
166  if ((mask << j) & 0x80)
167  s += bpp;
168  }
169  break;
170  }
171 }
172 
174  int w, int bpp)
175 {
176  int i;
177  for (i = 0; i < w; i++) {
178  int a, b, c, p, pa, pb, pc;
179 
180  a = dst[i - bpp];
181  b = top[i];
182  c = top[i - bpp];
183 
184  p = b - c;
185  pc = a - c;
186 
187  pa = abs(p);
188  pb = abs(pc);
189  pc = abs(p + pc);
190 
191  if (pa <= pb && pa <= pc)
192  p = a;
193  else if (pb <= pc)
194  p = b;
195  else
196  p = c;
197  dst[i] = p + src[i];
198  }
199 }
200 
201 #define UNROLL1(bpp, op) \
202  { \
203  r = dst[0]; \
204  if (bpp >= 2) \
205  g = dst[1]; \
206  if (bpp >= 3) \
207  b = dst[2]; \
208  if (bpp >= 4) \
209  a = dst[3]; \
210  for (; i <= size - bpp; i += bpp) { \
211  dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
212  if (bpp == 1) \
213  continue; \
214  dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
215  if (bpp == 2) \
216  continue; \
217  dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
218  if (bpp == 3) \
219  continue; \
220  dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
221  } \
222  }
223 
224 #define UNROLL_FILTER(op) \
225  if (bpp == 1) { \
226  UNROLL1(1, op) \
227  } else if (bpp == 2) { \
228  UNROLL1(2, op) \
229  } else if (bpp == 3) { \
230  UNROLL1(3, op) \
231  } else if (bpp == 4) { \
232  UNROLL1(4, op) \
233  } \
234  for (; i < size; i++) { \
235  dst[i] = op(dst[i - bpp], src[i], last[i]); \
236  }
237 
238 /* NOTE: 'dst' can be equal to 'last' */
239 static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
240  uint8_t *src, uint8_t *last, int size, int bpp)
241 {
242  int i, p, r, g, b, a;
243 
244  switch (filter_type) {
246  memcpy(dst, src, size);
247  break;
249  for (i = 0; i < bpp; i++)
250  dst[i] = src[i];
251  if (bpp == 4) {
252  p = *(int *)dst;
253  for (; i < size; i += bpp) {
254  unsigned s = *(int *)(src + i);
255  p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
256  *(int *)(dst + i) = p;
257  }
258  } else {
259 #define OP_SUB(x, s, l) ((x) + (s))
261  }
262  break;
263  case PNG_FILTER_VALUE_UP:
264  dsp->add_bytes_l2(dst, src, last, size);
265  break;
267  for (i = 0; i < bpp; i++) {
268  p = (last[i] >> 1);
269  dst[i] = p + src[i];
270  }
271 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
273  break;
275  for (i = 0; i < bpp; i++) {
276  p = last[i];
277  dst[i] = p + src[i];
278  }
279  if (bpp > 2 && size > 4) {
280  /* would write off the end of the array if we let it process
281  * the last pixel with bpp=3 */
282  int w = (bpp & 3) ? size - 3 : size;
283 
284  if (w > i) {
285  dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
286  i = w;
287  }
288  }
289  ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
290  break;
291  }
292 }
293 
294 /* This used to be called "deloco" in FFmpeg
295  * and is actually an inverse reversible colorspace transformation */
296 #define YUV2RGB(NAME, TYPE) \
297 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
298 { \
299  int i; \
300  for (i = 0; i < size; i += 3 + alpha) { \
301  int g = dst [i + 1]; \
302  dst[i + 0] += g; \
303  dst[i + 2] += g; \
304  } \
305 }
306 
307 YUV2RGB(rgb8, uint8_t)
308 YUV2RGB(rgb16, uint16_t)
309 
310 /* process exactly one decompressed row */
312 {
313  uint8_t *ptr, *last_row;
314  int got_line;
315 
316  if (!s->interlace_type) {
317  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
318  if (s->y == 0)
319  last_row = s->last_row;
320  else
321  last_row = ptr - s->image_linesize;
322 
323  png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
324  last_row, s->row_size, s->bpp);
325  /* loco lags by 1 row so that it doesn't interfere with top prediction */
326  if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
327  if (s->bit_depth == 16) {
328  deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2,
329  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
330  } else {
331  deloco_rgb8(ptr - s->image_linesize, s->row_size,
332  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
333  }
334  }
335  s->y++;
336  if (s->y == s->cur_h) {
337  s->state |= PNG_ALLIMAGE;
338  if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
339  if (s->bit_depth == 16) {
340  deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
341  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
342  } else {
343  deloco_rgb8(ptr, s->row_size,
344  s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
345  }
346  }
347  }
348  } else {
349  got_line = 0;
350  for (;;) {
351  ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
352  if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
353  /* if we already read one row, it is time to stop to
354  * wait for the next one */
355  if (got_line)
356  break;
357  png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
358  s->last_row, s->pass_row_size, s->bpp);
359  FFSWAP(uint8_t *, s->last_row, s->tmp_row);
360  FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
361  got_line = 1;
362  }
363  if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
364  png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
365  s->color_type, s->last_row);
366  }
367  s->y++;
368  if (s->y == s->cur_h) {
369  memset(s->last_row, 0, s->row_size);
370  for (;;) {
371  if (s->pass == NB_PASSES - 1) {
372  s->state |= PNG_ALLIMAGE;
373  goto the_end;
374  } else {
375  s->pass++;
376  s->y = 0;
377  s->pass_row_size = ff_png_pass_row_size(s->pass,
378  s->bits_per_pixel,
379  s->cur_w);
380  s->crow_size = s->pass_row_size + 1;
381  if (s->pass_row_size != 0)
382  break;
383  /* skip pass if empty row */
384  }
385  }
386  }
387  }
388 the_end:;
389  }
390 }
391 
393 {
394  int ret;
395  s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
396  s->zstream.next_in = (unsigned char *)s->gb.buffer;
397  bytestream2_skip(&s->gb, length);
398 
399  /* decode one line if possible */
400  while (s->zstream.avail_in > 0) {
401  ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
402  if (ret != Z_OK && ret != Z_STREAM_END) {
403  av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
404  return AVERROR_EXTERNAL;
405  }
406  if (s->zstream.avail_out == 0) {
407  if (!(s->state & PNG_ALLIMAGE)) {
408  png_handle_row(s);
409  }
410  s->zstream.avail_out = s->crow_size;
411  s->zstream.next_out = s->crow_buf;
412  }
413  if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
415  "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
416  return 0;
417  }
418  }
419  return 0;
420 }
421 
422 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
423  const uint8_t *data_end)
424 {
425  z_stream zstream;
426  unsigned char *buf;
427  unsigned buf_size;
428  int ret;
429 
430  zstream.zalloc = ff_png_zalloc;
431  zstream.zfree = ff_png_zfree;
432  zstream.opaque = NULL;
433  if (inflateInit(&zstream) != Z_OK)
434  return AVERROR_EXTERNAL;
435  zstream.next_in = (unsigned char *)data;
436  zstream.avail_in = data_end - data;
437  av_bprint_init(bp, 0, -1);
438 
439  while (zstream.avail_in > 0) {
440  av_bprint_get_buffer(bp, 1, &buf, &buf_size);
441  if (!buf_size) {
442  ret = AVERROR(ENOMEM);
443  goto fail;
444  }
445  zstream.next_out = buf;
446  zstream.avail_out = buf_size;
447  ret = inflate(&zstream, Z_PARTIAL_FLUSH);
448  if (ret != Z_OK && ret != Z_STREAM_END) {
449  ret = AVERROR_EXTERNAL;
450  goto fail;
451  }
452  bp->len += zstream.next_out - buf;
453  if (ret == Z_STREAM_END)
454  break;
455  }
456  inflateEnd(&zstream);
457  bp->str[bp->len] = 0;
458  return 0;
459 
460 fail:
461  inflateEnd(&zstream);
463  return ret;
464 }
465 
466 static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
467 {
468  size_t extra = 0, i;
469  uint8_t *out, *q;
470 
471  for (i = 0; i < size_in; i++)
472  extra += in[i] >= 0x80;
473  if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
474  return NULL;
475  q = out = av_malloc(size_in + extra + 1);
476  if (!out)
477  return NULL;
478  for (i = 0; i < size_in; i++) {
479  if (in[i] >= 0x80) {
480  *(q++) = 0xC0 | (in[i] >> 6);
481  *(q++) = 0x80 | (in[i] & 0x3F);
482  } else {
483  *(q++) = in[i];
484  }
485  }
486  *(q++) = 0;
487  return out;
488 }
489 
490 static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed,
491  AVDictionary **dict)
492 {
493  int ret, method;
494  const uint8_t *data = s->gb.buffer;
495  const uint8_t *data_end = data + length;
496  const uint8_t *keyword = data;
497  const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
498  uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
499  unsigned text_len;
500  AVBPrint bp;
501 
502  if (!keyword_end)
503  return AVERROR_INVALIDDATA;
504  data = keyword_end + 1;
505 
506  if (compressed) {
507  if (data == data_end)
508  return AVERROR_INVALIDDATA;
509  method = *(data++);
510  if (method)
511  return AVERROR_INVALIDDATA;
512  if ((ret = decode_zbuf(&bp, data, data_end)) < 0)
513  return ret;
514  text_len = bp.len;
515  av_bprint_finalize(&bp, (char **)&text);
516  if (!text)
517  return AVERROR(ENOMEM);
518  } else {
519  text = (uint8_t *)data;
520  text_len = data_end - text;
521  }
522 
523  kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
524  txt_utf8 = iso88591_to_utf8(text, text_len);
525  if (text != data)
526  av_free(text);
527  if (!(kw_utf8 && txt_utf8)) {
528  av_free(kw_utf8);
529  av_free(txt_utf8);
530  return AVERROR(ENOMEM);
531  }
532 
533  av_dict_set(dict, kw_utf8, txt_utf8,
535  return 0;
536 }
537 
539  uint32_t length)
540 {
541  if (length != 13)
542  return AVERROR_INVALIDDATA;
543 
544  if (s->state & PNG_IDAT) {
545  av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
546  return AVERROR_INVALIDDATA;
547  }
548 
549  if (s->state & PNG_IHDR) {
550  av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
551  return AVERROR_INVALIDDATA;
552  }
553 
554  s->width = s->cur_w = bytestream2_get_be32(&s->gb);
555  s->height = s->cur_h = bytestream2_get_be32(&s->gb);
556  if (av_image_check_size(s->width, s->height, 0, avctx)) {
557  s->cur_w = s->cur_h = s->width = s->height = 0;
558  av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
559  return AVERROR_INVALIDDATA;
560  }
561  s->bit_depth = bytestream2_get_byte(&s->gb);
562  s->color_type = bytestream2_get_byte(&s->gb);
563  s->compression_type = bytestream2_get_byte(&s->gb);
564  s->filter_type = bytestream2_get_byte(&s->gb);
565  s->interlace_type = bytestream2_get_byte(&s->gb);
566  bytestream2_skip(&s->gb, 4); /* crc */
567  s->state |= PNG_IHDR;
568  if (avctx->debug & FF_DEBUG_PICT_INFO)
569  av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
570  "compression_type=%d filter_type=%d interlace_type=%d\n",
571  s->width, s->height, s->bit_depth, s->color_type,
573 
574  return 0;
575 }
576 
578 {
579  if (s->state & PNG_IDAT) {
580  av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
581  return AVERROR_INVALIDDATA;
582  }
583  avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb);
584  avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb);
585  if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
586  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
587  bytestream2_skip(&s->gb, 1); /* unit specifier */
588  bytestream2_skip(&s->gb, 4); /* crc */
589 
590  return 0;
591 }
592 
594  uint32_t length, AVFrame *p)
595 {
596  int ret;
597  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
598 
599  if (!(s->state & PNG_IHDR)) {
600  av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
601  return AVERROR_INVALIDDATA;
602  }
603  if (!(s->state & PNG_IDAT)) {
604  /* init image info */
605  avctx->width = s->width;
606  avctx->height = s->height;
607 
609  s->bits_per_pixel = s->bit_depth * s->channels;
610  s->bpp = (s->bits_per_pixel + 7) >> 3;
611  s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
612 
613  if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
615  avctx->pix_fmt = AV_PIX_FMT_RGB24;
616  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
618  avctx->pix_fmt = AV_PIX_FMT_RGBA;
619  } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
621  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
622  } else if (s->bit_depth == 16 &&
624  avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
625  } else if (s->bit_depth == 16 &&
627  avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
628  } else if (s->bit_depth == 16 &&
630  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
631  } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
633  avctx->pix_fmt = AV_PIX_FMT_PAL8;
634  } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
635  avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
636  } else if (s->bit_depth == 8 &&
638  avctx->pix_fmt = AV_PIX_FMT_YA8;
639  } else if (s->bit_depth == 16 &&
641  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
642  } else {
643  av_log(avctx, AV_LOG_ERROR, "unsupported bit depth %d "
644  "and color type %d\n",
645  s->bit_depth, s->color_type);
646  return AVERROR_INVALIDDATA;
647  }
648 
649  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
650  switch (avctx->pix_fmt) {
651  case AV_PIX_FMT_RGB24:
652  avctx->pix_fmt = AV_PIX_FMT_RGBA;
653  break;
654 
655  case AV_PIX_FMT_RGB48BE:
656  avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
657  break;
658 
659  case AV_PIX_FMT_GRAY8:
660  avctx->pix_fmt = AV_PIX_FMT_YA8;
661  break;
662 
663  case AV_PIX_FMT_GRAY16BE:
664  avctx->pix_fmt = AV_PIX_FMT_YA16BE;
665  break;
666 
667  default:
668  avpriv_request_sample(avctx, "bit depth %d "
669  "and color type %d with TRNS",
670  s->bit_depth, s->color_type);
671  return AVERROR_INVALIDDATA;
672  }
673 
674  s->bpp += byte_depth;
675  }
676 
677  if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
678  return ret;
681  if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
682  return ret;
683  }
684  ff_thread_finish_setup(avctx);
685 
687  p->key_frame = 1;
689 
690  /* compute the compressed row size */
691  if (!s->interlace_type) {
692  s->crow_size = s->row_size + 1;
693  } else {
694  s->pass = 0;
696  s->bits_per_pixel,
697  s->cur_w);
698  s->crow_size = s->pass_row_size + 1;
699  }
700  ff_dlog(avctx, "row_size=%d crow_size =%d\n",
701  s->row_size, s->crow_size);
702  s->image_buf = p->data[0];
703  s->image_linesize = p->linesize[0];
704  /* copy the palette if needed */
705  if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
706  memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
707  /* empty row is used if differencing to the first row */
709  if (!s->last_row)
710  return AVERROR_INVALIDDATA;
711  if (s->interlace_type ||
714  if (!s->tmp_row)
715  return AVERROR_INVALIDDATA;
716  }
717  /* compressed row */
719  if (!s->buffer)
720  return AVERROR(ENOMEM);
721 
722  /* we want crow_buf+1 to be 16-byte aligned */
723  s->crow_buf = s->buffer + 15;
724  s->zstream.avail_out = s->crow_size;
725  s->zstream.next_out = s->crow_buf;
726  }
727 
728  s->state |= PNG_IDAT;
729 
730  /* set image to non-transparent bpp while decompressing */
732  s->bpp -= byte_depth;
733 
734  ret = png_decode_idat(s, length);
735 
737  s->bpp += byte_depth;
738 
739  if (ret < 0)
740  return ret;
741 
742  bytestream2_skip(&s->gb, 4); /* crc */
743 
744  return 0;
745 }
746 
748  uint32_t length)
749 {
750  int n, i, r, g, b;
751 
752  if ((length % 3) != 0 || length > 256 * 3)
753  return AVERROR_INVALIDDATA;
754  /* read the palette */
755  n = length / 3;
756  for (i = 0; i < n; i++) {
757  r = bytestream2_get_byte(&s->gb);
758  g = bytestream2_get_byte(&s->gb);
759  b = bytestream2_get_byte(&s->gb);
760  s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
761  }
762  for (; i < 256; i++)
763  s->palette[i] = (0xFFU << 24);
764  s->state |= PNG_PLTE;
765  bytestream2_skip(&s->gb, 4); /* crc */
766 
767  return 0;
768 }
769 
771  uint32_t length)
772 {
773  int v, i;
774 
776  if (length > 256 || !(s->state & PNG_PLTE))
777  return AVERROR_INVALIDDATA;
778 
779  for (i = 0; i < length; i++) {
780  v = bytestream2_get_byte(&s->gb);
781  s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
782  }
783  } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
784  if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
785  (s->color_type == PNG_COLOR_TYPE_RGB && length != 6))
786  return AVERROR_INVALIDDATA;
787 
788  for (i = 0; i < length / 2; i++) {
789  /* only use the least significant bits */
790  v = av_mod_uintp2(bytestream2_get_be16(&s->gb), s->bit_depth);
791 
792  if (s->bit_depth > 8)
793  AV_WB16(&s->transparent_color_be[2 * i], v);
794  else
795  s->transparent_color_be[i] = v;
796  }
797  } else {
798  return AVERROR_INVALIDDATA;
799  }
800 
801  bytestream2_skip(&s->gb, 4); /* crc */
802  s->has_trns = 1;
803 
804  return 0;
805 }
806 
808 {
809  if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
810  int i, j, k;
811  uint8_t *pd = p->data[0];
812  for (j = 0; j < s->height; j++) {
813  i = s->width / 8;
814  for (k = 7; k >= 1; k--)
815  if ((s->width&7) >= k)
816  pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
817  for (i--; i >= 0; i--) {
818  pd[8*i + 7]= pd[i] & 1;
819  pd[8*i + 6]= (pd[i]>>1) & 1;
820  pd[8*i + 5]= (pd[i]>>2) & 1;
821  pd[8*i + 4]= (pd[i]>>3) & 1;
822  pd[8*i + 3]= (pd[i]>>4) & 1;
823  pd[8*i + 2]= (pd[i]>>5) & 1;
824  pd[8*i + 1]= (pd[i]>>6) & 1;
825  pd[8*i + 0]= pd[i]>>7;
826  }
827  pd += s->image_linesize;
828  }
829  } else if (s->bits_per_pixel == 2) {
830  int i, j;
831  uint8_t *pd = p->data[0];
832  for (j = 0; j < s->height; j++) {
833  i = s->width / 4;
835  if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
836  if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
837  if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
838  for (i--; i >= 0; i--) {
839  pd[4*i + 3]= pd[i] & 3;
840  pd[4*i + 2]= (pd[i]>>2) & 3;
841  pd[4*i + 1]= (pd[i]>>4) & 3;
842  pd[4*i + 0]= pd[i]>>6;
843  }
844  } else {
845  if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
846  if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
847  if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
848  for (i--; i >= 0; i--) {
849  pd[4*i + 3]= ( pd[i] & 3)*0x55;
850  pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
851  pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
852  pd[4*i + 0]= ( pd[i]>>6 )*0x55;
853  }
854  }
855  pd += s->image_linesize;
856  }
857  } else if (s->bits_per_pixel == 4) {
858  int i, j;
859  uint8_t *pd = p->data[0];
860  for (j = 0; j < s->height; j++) {
861  i = s->width/2;
863  if (s->width&1) pd[2*i+0]= pd[i]>>4;
864  for (i--; i >= 0; i--) {
865  pd[2*i + 1] = pd[i] & 15;
866  pd[2*i + 0] = pd[i] >> 4;
867  }
868  } else {
869  if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
870  for (i--; i >= 0; i--) {
871  pd[2*i + 1] = (pd[i] & 15) * 0x11;
872  pd[2*i + 0] = (pd[i] >> 4) * 0x11;
873  }
874  }
875  pd += s->image_linesize;
876  }
877  }
878 }
879 
881  uint32_t length)
882 {
883  uint32_t sequence_number;
884  int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
885 
886  if (length != 26)
887  return AVERROR_INVALIDDATA;
888 
889  if (!(s->state & PNG_IHDR)) {
890  av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
891  return AVERROR_INVALIDDATA;
892  }
893 
894  s->last_w = s->cur_w;
895  s->last_h = s->cur_h;
896  s->last_x_offset = s->x_offset;
897  s->last_y_offset = s->y_offset;
898  s->last_dispose_op = s->dispose_op;
899 
900  sequence_number = bytestream2_get_be32(&s->gb);
901  cur_w = bytestream2_get_be32(&s->gb);
902  cur_h = bytestream2_get_be32(&s->gb);
903  x_offset = bytestream2_get_be32(&s->gb);
904  y_offset = bytestream2_get_be32(&s->gb);
905  bytestream2_skip(&s->gb, 4); /* delay_num (2), delay_den (2) */
906  dispose_op = bytestream2_get_byte(&s->gb);
907  blend_op = bytestream2_get_byte(&s->gb);
908  bytestream2_skip(&s->gb, 4); /* crc */
909 
910  if (sequence_number == 0 &&
911  (cur_w != s->width ||
912  cur_h != s->height ||
913  x_offset != 0 ||
914  y_offset != 0) ||
915  cur_w <= 0 || cur_h <= 0 ||
916  x_offset < 0 || y_offset < 0 ||
917  cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
918  return AVERROR_INVALIDDATA;
919 
920  if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
921  av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
922  return AVERROR_INVALIDDATA;
923  }
924 
925  if (sequence_number == 0 && dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
926  // No previous frame to revert to for the first frame
927  // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
928  dispose_op = APNG_DISPOSE_OP_BACKGROUND;
929  }
930 
931  if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
932  avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
933  avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
934  avctx->pix_fmt == AV_PIX_FMT_PAL8 ||
935  avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
936  avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
937  avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
938  )) {
939  // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
940  blend_op = APNG_BLEND_OP_SOURCE;
941  }
942 
943  s->cur_w = cur_w;
944  s->cur_h = cur_h;
945  s->x_offset = x_offset;
946  s->y_offset = y_offset;
947  s->dispose_op = dispose_op;
948  s->blend_op = blend_op;
949 
950  return 0;
951 }
952 
954 {
955  int i, j;
956  uint8_t *pd = p->data[0];
957  uint8_t *pd_last = s->last_picture.f->data[0];
958  int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
959 
960  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
961  for (j = 0; j < s->height; j++) {
962  for (i = 0; i < ls; i++)
963  pd[i] += pd_last[i];
964  pd += s->image_linesize;
965  pd_last += s->image_linesize;
966  }
967 }
968 
969 // divide by 255 and round to nearest
970 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
971 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
972 
974  AVFrame *p)
975 {
976  size_t x, y;
977  uint8_t *buffer;
978 
979  if (s->blend_op == APNG_BLEND_OP_OVER &&
980  avctx->pix_fmt != AV_PIX_FMT_RGBA &&
981  avctx->pix_fmt != AV_PIX_FMT_GRAY8A &&
982  avctx->pix_fmt != AV_PIX_FMT_PAL8) {
983  avpriv_request_sample(avctx, "Blending with pixel format %s",
984  av_get_pix_fmt_name(avctx->pix_fmt));
985  return AVERROR_PATCHWELCOME;
986  }
987 
988  buffer = av_malloc_array(s->image_linesize, s->height);
989  if (!buffer)
990  return AVERROR(ENOMEM);
991 
992 
993  // Do the disposal operation specified by the last frame on the frame
995  ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
996  memcpy(buffer, s->last_picture.f->data[0], s->image_linesize * s->height);
997 
999  for (y = s->last_y_offset; y < s->last_y_offset + s->last_h; ++y)
1000  memset(buffer + s->image_linesize * y + s->bpp * s->last_x_offset, 0, s->bpp * s->last_w);
1001 
1002  memcpy(s->previous_picture.f->data[0], buffer, s->image_linesize * s->height);
1004  } else {
1005  ff_thread_await_progress(&s->previous_picture, INT_MAX, 0);
1006  memcpy(buffer, s->previous_picture.f->data[0], s->image_linesize * s->height);
1007  }
1008 
1009  // Perform blending
1010  if (s->blend_op == APNG_BLEND_OP_SOURCE) {
1011  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1012  size_t row_start = s->image_linesize * y + s->bpp * s->x_offset;
1013  memcpy(buffer + row_start, p->data[0] + row_start, s->bpp * s->cur_w);
1014  }
1015  } else { // APNG_BLEND_OP_OVER
1016  for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1017  uint8_t *foreground = p->data[0] + s->image_linesize * y + s->bpp * s->x_offset;
1018  uint8_t *background = buffer + s->image_linesize * y + s->bpp * s->x_offset;
1019  for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += s->bpp, background += s->bpp) {
1020  size_t b;
1021  uint8_t foreground_alpha, background_alpha, output_alpha;
1022  uint8_t output[10];
1023 
1024  // Since we might be blending alpha onto alpha, we use the following equations:
1025  // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1026  // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1027 
1028  switch (avctx->pix_fmt) {
1029  case AV_PIX_FMT_RGBA:
1030  foreground_alpha = foreground[3];
1031  background_alpha = background[3];
1032  break;
1033 
1034  case AV_PIX_FMT_GRAY8A:
1035  foreground_alpha = foreground[1];
1036  background_alpha = background[1];
1037  break;
1038 
1039  case AV_PIX_FMT_PAL8:
1040  foreground_alpha = s->palette[foreground[0]] >> 24;
1041  background_alpha = s->palette[background[0]] >> 24;
1042  break;
1043  }
1044 
1045  if (foreground_alpha == 0)
1046  continue;
1047 
1048  if (foreground_alpha == 255) {
1049  memcpy(background, foreground, s->bpp);
1050  continue;
1051  }
1052 
1053  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1054  // TODO: Alpha blending with PAL8 will likely need the entire image converted over to RGBA first
1055  avpriv_request_sample(avctx, "Alpha blending palette samples");
1056  background[0] = foreground[0];
1057  continue;
1058  }
1059 
1060  output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1061 
1062  av_assert0(s->bpp <= 10);
1063 
1064  for (b = 0; b < s->bpp - 1; ++b) {
1065  if (output_alpha == 0) {
1066  output[b] = 0;
1067  } else if (background_alpha == 255) {
1068  output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1069  } else {
1070  output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1071  }
1072  }
1073  output[b] = output_alpha;
1074  memcpy(background, output, s->bpp);
1075  }
1076  }
1077  }
1078 
1079  // Copy blended buffer into the frame and free
1080  memcpy(p->data[0], buffer, s->image_linesize * s->height);
1081  av_free(buffer);
1082 
1083  return 0;
1084 }
1085 
1087  AVFrame *p, AVPacket *avpkt)
1088 {
1089  AVDictionary *metadata = NULL;
1090  uint32_t tag, length;
1091  int decode_next_dat = 0;
1092  int ret;
1093 
1094  for (;;) {
1095  length = bytestream2_get_bytes_left(&s->gb);
1096  if (length <= 0) {
1097 
1098  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1099  avctx->skip_frame == AVDISCARD_ALL) {
1100  av_frame_set_metadata(p, metadata);
1101  return 0;
1102  }
1103 
1104  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1105  if (!(s->state & PNG_IDAT))
1106  return 0;
1107  else
1108  goto exit_loop;
1109  }
1110  av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1111  if ( s->state & PNG_ALLIMAGE
1113  goto exit_loop;
1114  ret = AVERROR_INVALIDDATA;
1115  goto fail;
1116  }
1117 
1118  length = bytestream2_get_be32(&s->gb);
1119  if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) {
1120  av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1121  ret = AVERROR_INVALIDDATA;
1122  goto fail;
1123  }
1124  tag = bytestream2_get_le32(&s->gb);
1125  if (avctx->debug & FF_DEBUG_STARTCODE)
1126  av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n",
1127  (tag & 0xff),
1128  ((tag >> 8) & 0xff),
1129  ((tag >> 16) & 0xff),
1130  ((tag >> 24) & 0xff), length);
1131 
1132  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1133  avctx->skip_frame == AVDISCARD_ALL) {
1134  switch(tag) {
1135  case MKTAG('I', 'H', 'D', 'R'):
1136  case MKTAG('p', 'H', 'Y', 's'):
1137  case MKTAG('t', 'E', 'X', 't'):
1138  case MKTAG('I', 'D', 'A', 'T'):
1139  case MKTAG('t', 'R', 'N', 'S'):
1140  break;
1141  default:
1142  goto skip_tag;
1143  }
1144  }
1145 
1146  switch (tag) {
1147  case MKTAG('I', 'H', 'D', 'R'):
1148  if ((ret = decode_ihdr_chunk(avctx, s, length)) < 0)
1149  goto fail;
1150  break;
1151  case MKTAG('p', 'H', 'Y', 's'):
1152  if ((ret = decode_phys_chunk(avctx, s)) < 0)
1153  goto fail;
1154  break;
1155  case MKTAG('f', 'c', 'T', 'L'):
1156  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1157  goto skip_tag;
1158  if ((ret = decode_fctl_chunk(avctx, s, length)) < 0)
1159  goto fail;
1160  decode_next_dat = 1;
1161  break;
1162  case MKTAG('f', 'd', 'A', 'T'):
1163  if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1164  goto skip_tag;
1165  if (!decode_next_dat) {
1166  ret = AVERROR_INVALIDDATA;
1167  goto fail;
1168  }
1169  bytestream2_get_be32(&s->gb);
1170  length -= 4;
1171  /* fallthrough */
1172  case MKTAG('I', 'D', 'A', 'T'):
1173  if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1174  goto skip_tag;
1175  if ((ret = decode_idat_chunk(avctx, s, length, p)) < 0)
1176  goto fail;
1177  break;
1178  case MKTAG('P', 'L', 'T', 'E'):
1179  if (decode_plte_chunk(avctx, s, length) < 0)
1180  goto skip_tag;
1181  break;
1182  case MKTAG('t', 'R', 'N', 'S'):
1183  if (decode_trns_chunk(avctx, s, length) < 0)
1184  goto skip_tag;
1185  break;
1186  case MKTAG('t', 'E', 'X', 't'):
1187  if (decode_text_chunk(s, length, 0, &metadata) < 0)
1188  av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1189  bytestream2_skip(&s->gb, length + 4);
1190  break;
1191  case MKTAG('z', 'T', 'X', 't'):
1192  if (decode_text_chunk(s, length, 1, &metadata) < 0)
1193  av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1194  bytestream2_skip(&s->gb, length + 4);
1195  break;
1196  case MKTAG('s', 'T', 'E', 'R'): {
1197  int mode = bytestream2_get_byte(&s->gb);
1199  if (!stereo3d)
1200  goto fail;
1201 
1202  if (mode == 0 || mode == 1) {
1203  stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1204  stereo3d->flags = mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1205  } else {
1206  av_log(avctx, AV_LOG_WARNING,
1207  "Unknown value in sTER chunk (%d)\n", mode);
1208  }
1209  bytestream2_skip(&s->gb, 4); /* crc */
1210  break;
1211  }
1212  case MKTAG('I', 'E', 'N', 'D'):
1213  if (!(s->state & PNG_ALLIMAGE))
1214  av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1215  if (!(s->state & (PNG_ALLIMAGE|PNG_IDAT))) {
1216  ret = AVERROR_INVALIDDATA;
1217  goto fail;
1218  }
1219  bytestream2_skip(&s->gb, 4); /* crc */
1220  goto exit_loop;
1221  default:
1222  /* skip tag */
1223 skip_tag:
1224  bytestream2_skip(&s->gb, length + 4);
1225  break;
1226  }
1227  }
1228 exit_loop:
1229  if (avctx->codec_id == AV_CODEC_ID_PNG &&
1230  avctx->skip_frame == AVDISCARD_ALL) {
1231  av_frame_set_metadata(p, metadata);
1232  return 0;
1233  }
1234 
1235  if (s->bits_per_pixel <= 4)
1236  handle_small_bpp(s, p);
1237 
1238  /* apply transparency if needed */
1239  if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1240  size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1241  size_t raw_bpp = s->bpp - byte_depth;
1242  unsigned x, y;
1243 
1244  for (y = 0; y < s->height; ++y) {
1245  uint8_t *row = &s->image_buf[s->image_linesize * y];
1246 
1247  /* since we're updating in-place, we have to go from right to left */
1248  for (x = s->width; x > 0; --x) {
1249  uint8_t *pixel = &row[s->bpp * (x - 1)];
1250  memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1251 
1252  if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1253  memset(&pixel[raw_bpp], 0, byte_depth);
1254  } else {
1255  memset(&pixel[raw_bpp], 0xff, byte_depth);
1256  }
1257  }
1258  }
1259  }
1260 
1261  /* handle P-frames only if a predecessor frame is available */
1262  if (s->last_picture.f->data[0]) {
1263  if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1264  && s->last_picture.f->width == p->width
1265  && s->last_picture.f->height== p->height
1266  && s->last_picture.f->format== p->format
1267  ) {
1268  if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1269  handle_p_frame_png(s, p);
1270  else if (CONFIG_APNG_DECODER &&
1271  avctx->codec_id == AV_CODEC_ID_APNG &&
1272  (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1273  goto fail;
1274  }
1275  }
1276  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1278 
1279  av_frame_set_metadata(p, metadata);
1280  metadata = NULL;
1281  return 0;
1282 
1283 fail:
1284  av_dict_free(&metadata);
1285  ff_thread_report_progress(&s->picture, INT_MAX, 0);
1287  return ret;
1288 }
1289 
1290 #if CONFIG_PNG_DECODER
1291 static int decode_frame_png(AVCodecContext *avctx,
1292  void *data, int *got_frame,
1293  AVPacket *avpkt)
1294 {
1295  PNGDecContext *const s = avctx->priv_data;
1296  const uint8_t *buf = avpkt->data;
1297  int buf_size = avpkt->size;
1298  AVFrame *p;
1299  int64_t sig;
1300  int ret;
1301 
1304  p = s->picture.f;
1305 
1306  bytestream2_init(&s->gb, buf, buf_size);
1307 
1308  /* check signature */
1309  sig = bytestream2_get_be64(&s->gb);
1310  if (sig != PNGSIG &&
1311  sig != MNGSIG) {
1312  av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1313  return AVERROR_INVALIDDATA;
1314  }
1315 
1316  s->y = s->state = s->has_trns = 0;
1317 
1318  /* init the zlib */
1319  s->zstream.zalloc = ff_png_zalloc;
1320  s->zstream.zfree = ff_png_zfree;
1321  s->zstream.opaque = NULL;
1322  ret = inflateInit(&s->zstream);
1323  if (ret != Z_OK) {
1324  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1325  return AVERROR_EXTERNAL;
1326  }
1327 
1328  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1329  goto the_end;
1330 
1331  if (avctx->skip_frame == AVDISCARD_ALL) {
1332  *got_frame = 0;
1333  ret = bytestream2_tell(&s->gb);
1334  goto the_end;
1335  }
1336 
1337  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1338  return ret;
1339 
1340  *got_frame = 1;
1341 
1342  ret = bytestream2_tell(&s->gb);
1343 the_end:
1344  inflateEnd(&s->zstream);
1345  s->crow_buf = NULL;
1346  return ret;
1347 }
1348 #endif
1349 
1350 #if CONFIG_APNG_DECODER
1351 static int decode_frame_apng(AVCodecContext *avctx,
1352  void *data, int *got_frame,
1353  AVPacket *avpkt)
1354 {
1355  PNGDecContext *const s = avctx->priv_data;
1356  int ret;
1357  AVFrame *p;
1358 
1361  p = s->picture.f;
1362 
1363  if (!(s->state & PNG_IHDR)) {
1364  if (!avctx->extradata_size)
1365  return AVERROR_INVALIDDATA;
1366 
1367  /* only init fields, there is no zlib use in extradata */
1368  s->zstream.zalloc = ff_png_zalloc;
1369  s->zstream.zfree = ff_png_zfree;
1370 
1371  bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1372  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1373  goto end;
1374  }
1375 
1376  /* reset state for a new frame */
1377  if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1378  av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1379  ret = AVERROR_EXTERNAL;
1380  goto end;
1381  }
1382  s->y = 0;
1383  s->state &= ~(PNG_IDAT | PNG_ALLIMAGE);
1384  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1385  if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1386  goto end;
1387 
1388  if (!(s->state & PNG_ALLIMAGE))
1389  av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1390  if (!(s->state & (PNG_ALLIMAGE|PNG_IDAT))) {
1391  ret = AVERROR_INVALIDDATA;
1392  goto end;
1393  }
1394  if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1395  goto end;
1396 
1397  *got_frame = 1;
1398  ret = bytestream2_tell(&s->gb);
1399 
1400 end:
1401  inflateEnd(&s->zstream);
1402  return ret;
1403 }
1404 #endif
1405 
1406 #if HAVE_THREADS
1407 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1408 {
1409  PNGDecContext *psrc = src->priv_data;
1410  PNGDecContext *pdst = dst->priv_data;
1411  int ret;
1412 
1413  if (dst == src)
1414  return 0;
1415 
1416  ff_thread_release_buffer(dst, &pdst->picture);
1417  if (psrc->picture.f->data[0] &&
1418  (ret = ff_thread_ref_frame(&pdst->picture, &psrc->picture)) < 0)
1419  return ret;
1420  if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1421  pdst->width = psrc->width;
1422  pdst->height = psrc->height;
1423  pdst->bit_depth = psrc->bit_depth;
1424  pdst->color_type = psrc->color_type;
1425  pdst->compression_type = psrc->compression_type;
1426  pdst->interlace_type = psrc->interlace_type;
1427  pdst->filter_type = psrc->filter_type;
1428  pdst->cur_w = psrc->cur_w;
1429  pdst->cur_h = psrc->cur_h;
1430  pdst->x_offset = psrc->x_offset;
1431  pdst->y_offset = psrc->y_offset;
1432  pdst->has_trns = psrc->has_trns;
1433  memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1434 
1435  pdst->dispose_op = psrc->dispose_op;
1436 
1437  memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1438 
1439  pdst->state |= psrc->state & (PNG_IHDR | PNG_PLTE);
1440 
1442  if (psrc->last_picture.f->data[0] &&
1443  (ret = ff_thread_ref_frame(&pdst->last_picture, &psrc->last_picture)) < 0)
1444  return ret;
1445 
1447  if (psrc->previous_picture.f->data[0] &&
1448  (ret = ff_thread_ref_frame(&pdst->previous_picture, &psrc->previous_picture)) < 0)
1449  return ret;
1450  }
1451 
1452  return 0;
1453 }
1454 #endif
1455 
1457 {
1458  PNGDecContext *s = avctx->priv_data;
1459 
1460  avctx->color_range = AVCOL_RANGE_JPEG;
1461 
1462  s->avctx = avctx;
1464  s->last_picture.f = av_frame_alloc();
1465  s->picture.f = av_frame_alloc();
1466  if (!s->previous_picture.f || !s->last_picture.f || !s->picture.f) {
1469  av_frame_free(&s->picture.f);
1470  return AVERROR(ENOMEM);
1471  }
1472 
1473  if (!avctx->internal->is_copy) {
1474  avctx->internal->allocate_progress = 1;
1475  ff_pngdsp_init(&s->dsp);
1476  }
1477 
1478  return 0;
1479 }
1480 
1482 {
1483  PNGDecContext *s = avctx->priv_data;
1484 
1489  ff_thread_release_buffer(avctx, &s->picture);
1490  av_frame_free(&s->picture.f);
1491  av_freep(&s->buffer);
1492  s->buffer_size = 0;
1493  av_freep(&s->last_row);
1494  s->last_row_size = 0;
1495  av_freep(&s->tmp_row);
1496  s->tmp_row_size = 0;
1497 
1498  return 0;
1499 }
1500 
1501 #if CONFIG_APNG_DECODER
1502 AVCodec ff_apng_decoder = {
1503  .name = "apng",
1504  .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1505  .type = AVMEDIA_TYPE_VIDEO,
1506  .id = AV_CODEC_ID_APNG,
1507  .priv_data_size = sizeof(PNGDecContext),
1508  .init = png_dec_init,
1509  .close = png_dec_end,
1510  .decode = decode_frame_apng,
1512  .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1513  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1514 };
1515 #endif
1516 
1517 #if CONFIG_PNG_DECODER
1518 AVCodec ff_png_decoder = {
1519  .name = "png",
1520  .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1521  .type = AVMEDIA_TYPE_VIDEO,
1522  .id = AV_CODEC_ID_PNG,
1523  .priv_data_size = sizeof(PNGDecContext),
1524  .init = png_dec_init,
1525  .close = png_dec_end,
1526  .decode = decode_frame_png,
1528  .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1529  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1530  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
1531 };
1532 #endif
static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length, AVFrame *p)
Definition: pngdec.c:593
static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:880
#define PNG_FILTER_VALUE_AVG
Definition: png.h:41
static void png_handle_row(PNGDecContext *s)
Definition: pngdec.c:311
ThreadFrame previous_picture
Definition: pngdec.c:44
#define NULL
Definition: coverity.c:32
int last_y_offset
Definition: pngdec.c:53
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:75
const char * s
Definition: avisynth_c.h:631
#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:184
int width
Definition: pngdec.c:49
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
unsigned int tmp_row_size
Definition: pngdec.c:74
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
const char * g
Definition: vf_curves.c:112
int pass_row_size
Definition: pngdec.c:80
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
uint8_t * tmp_row
Definition: pngdec.c:73
void(* add_bytes_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
Definition: pngdsp.h:28
#define PNG_PLTE
Definition: png.h:48
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2393
int num
numerator
Definition: rational.h:44
static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed, AVDictionary **dict)
Definition: pngdec.c:490
int size
Definition: avcodec.h:1589
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:2068
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1885
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:120
discard all
Definition: avcodec.h:784
#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
Views are next to each other.
Definition: stereo3d.h:45
AVCodec.
Definition: avcodec.h:3559
#define PNG_COLOR_TYPE_PALETTE
Definition: png.h:32
#define PNG_IHDR
Definition: png.h:45
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
int filter_type
Definition: pngdec.c:60
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
Definition: pngdec.c:173
#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:3281
int state
Definition: pngdec.c:48
#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.
int y_offset
Definition: pngdec.c:52
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:140
#define PNG_COLOR_TYPE_RGB_ALPHA
Definition: png.h:34
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
mode
Definition: f_perms.c:27
Stereo 3D type: this structure describes how two videos are packed within a single video surface...
Definition: stereo3d.h:123
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2897
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:216
#define PNG_ALLIMAGE
Definition: png.h:47
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:374
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1772
static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s)
Definition: pngdec.c:577
uint8_t * data
Definition: avcodec.h:1588
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:1376
int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
Definition: utils.c:3841
#define ff_dlog(a,...)
void av_frame_set_metadata(AVFrame *frame, AVDictionary *val)
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:318
ptrdiff_t size
Definition: opengl_enc.c:101
unsigned int last_row_size
Definition: pngdec.c:72
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
#define AV_WB16(p, v)
Definition: intreadwrite.h:405
int cur_h
Definition: pngdec.c:50
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1620
static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:747
#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
width and height of the video frame
Definition: frame.h:236
#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:96
int flags
Additional information about the frame packing.
Definition: stereo3d.h:132
16 bits gray, 16 bits alpha (big-endian)
Definition: pixfmt.h:225
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:1086
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:111
#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:153
static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:953
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
uint8_t * crow_buf
Definition: pngdec.c:70
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:77
int ff_png_get_nb_channels(int color_type)
Definition: png.c:49
ThreadFrame picture
Definition: pngdec.c:46
int height
Definition: pngdec.c:49
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:202
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define PNGSIG
Definition: png.h:52
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:3566
int bits_per_pixel
Definition: pngdec.c:62
GetByteContext gb
Definition: pngdec.c:43
#define NB_PASSES
Definition: png.h:50
#define fail()
Definition: checkasm.h:82
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1019
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:94
uint8_t blend_op
Definition: pngdec.c:54
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1594
#define pass
Definition: fft_template.c:532
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:215
z_stream zstream
Definition: pngdec.c:82
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:251
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:258
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:69
#define width
#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:239
int width
picture width / height.
Definition: avcodec.h:1844
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:71
int n
Definition: avisynth_c.h:547
#define src
Definition: vp9dsp.c:530
AVCodecContext * avctx
Definition: pngdec.c:41
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:422
#define AV_STEREO3D_FLAG_INVERT
Inverted views, Right/Bottom represents the left view.
Definition: stereo3d.h:114
int channels
Definition: pngdec.c:61
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:459
static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, uint32_t length)
Definition: pngdec.c:538
static uint8_t * iso88591_to_utf8(const uint8_t *in, size_t size_in)
Definition: pngdec.c:466
#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:248
static av_cold int png_dec_init(AVCodecContext *avctx)
Definition: pngdec.c:1456
enum AVStereo3DType type
How views are packed within the video.
Definition: stereo3d.h:127
Libavcodec external API header.
int buffer_size
Definition: pngdec.c:76
static int skip_tag(AVIOContext *in, int32_t tag_name)
Definition: ismindex.c:134
enum AVCodecID codec_id
Definition: avcodec.h:1674
#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:215
#define PNG_FILTER_TYPE_LOCO
Definition: png.h:37
uint8_t last_dispose_op
Definition: pngdec.c:55
int debug
debug
Definition: avcodec.h:2896
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:1657
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1689
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:59
void * buf
Definition: avisynth_c.h:553
const uint8_t ff_png_pass_ymask[NB_PASSES]
Definition: png.c:25
int image_linesize
Definition: pngdec.c:68
int extradata_size
Definition: avcodec.h:1773
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:69
#define FF_COMPLIANCE_NORMAL
Definition: avcodec.h:2877
Y , 16bpp, big-endian.
Definition: pixfmt.h:98
rational number numerator/denominator
Definition: rational.h:43
int cur_w
Definition: pngdec.c:50
uint8_t transparent_color_be[6]
Definition: pngdec.c:65
#define OP_AVG(x, s, l)
uint8_t * image_buf
Definition: pngdec.c:67
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:126
uint8_t dispose_op
Definition: pngdec.c:54
uint8_t pixel
Definition: tiny_ssim.c:42
AVStereo3D * av_stereo3d_create_side_data(AVFrame *frame)
Allocate a complete AVFrameSideData and add it to the frame.
Definition: stereo3d.c:33
int last_x_offset
Definition: pngdec.c:53
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
#define FAST_DIV255(x)
Definition: pngdec.c:971
static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:973
#define YUV2RGB(NAME, TYPE)
Definition: pngdec.c:296
static const uint8_t png_pass_mask[NB_PASSES]
Definition: pngdec.c:86
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:752
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:72
#define PNG_IDAT
Definition: png.h:46
Y , 8bpp.
Definition: pixfmt.h:70
static av_cold int png_dec_end(AVCodecContext *avctx)
Definition: pngdec.c:1481
common internal api header.
static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
Definition: pngdec.c:807
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:770
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:51
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:132
static const uint8_t png_pass_dsp_ymask[NB_PASSES]
Definition: pngdec.c:91
int den
denominator
Definition: rational.h:45
void ff_png_zfree(void *opaque, void *ptr)
Definition: png.c:44
void * priv_data
Definition: avcodec.h:1699
static int png_decode_idat(PNGDecContext *s, int length)
Definition: pngdec.c:392
uint8_t * buffer
Definition: pngdec.c:75
#define av_free(p)
#define FF_DEBUG_STARTCODE
Definition: avcodec.h:2910
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1707
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:253
int row_size
Definition: pngdec.c:79
APNG common header.
PNGDSPContext dsp
Definition: pngdec.c:40
int compression_type
Definition: pngdec.c:58
int last_h
Definition: pngdec.c:51
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
Definition: png.c:62
int height
Definition: frame.h:236
FILE * out
Definition: movenc.c:54
int bit_depth
Definition: pngdec.c:56
#define av_freep(p)
int color_type
Definition: pngdec.c:57
ThreadFrame last_picture
Definition: pngdec.c:45
#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:103
#define FFSWAP(type, a, b)
Definition: common.h:99
int crow_size
Definition: pngdec.c:78
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:2179
int x_offset
Definition: pngdec.c:52
#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:1565
int has_trns
Definition: pngdec.c:64
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1341
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:956
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2874
GLuint buffer
Definition: opengl_enc.c:102
#define UNROLL_FILTER(op)
Definition: pngdec.c:224
#define MNGSIG
Definition: png.h:53