FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/pngdec.c
Date: 2025-07-02 09:19:21
Exec Total Coverage
Lines: 718 1107 64.9%
Functions: 26 32 81.2%
Branches: 476 836 56.9%
Line Branch Exec Source
1 /*
2 * PNG image format
3 * Copyright (c) 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 //#define DEBUG
23
24 #include "config_components.h"
25
26 #include "libavutil/avassert.h"
27 #include "libavutil/bprint.h"
28 #include "libavutil/crc.h"
29 #include "libavutil/csp.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/mastering_display_metadata.h"
33 #include "libavutil/mem.h"
34 #include "libavutil/pixfmt.h"
35 #include "libavutil/rational.h"
36 #include "libavutil/stereo3d.h"
37
38 #include "avcodec.h"
39 #include "bytestream.h"
40 #include "codec_internal.h"
41 #include "decode.h"
42 #include "apng.h"
43 #include "png.h"
44 #include "pngdsp.h"
45 #include "progressframe.h"
46 #include "thread.h"
47 #include "zlib_wrapper.h"
48
49 #include <zlib.h>
50
51 enum PNGHeaderState {
52 PNG_IHDR = 1 << 0,
53 PNG_PLTE = 1 << 1,
54 };
55
56 enum PNGImageState {
57 PNG_IDAT = 1 << 0,
58 PNG_ALLIMAGE = 1 << 1,
59 };
60
61 typedef struct PNGDecContext {
62 PNGDSPContext dsp;
63 AVCodecContext *avctx;
64
65 GetByteContext gb;
66 ProgressFrame last_picture;
67 ProgressFrame picture;
68
69 AVDictionary *frame_metadata;
70
71 uint8_t iccp_name[82];
72 uint8_t *iccp_data;
73 size_t iccp_data_len;
74
75 int stereo_mode;
76
77 int have_chrm;
78 uint32_t white_point[2];
79 uint32_t display_primaries[3][2];
80 int gamma;
81 int have_srgb;
82 int have_cicp;
83 enum AVColorPrimaries cicp_primaries;
84 enum AVColorTransferCharacteristic cicp_trc;
85 enum AVColorRange cicp_range;
86 int have_clli;
87 uint32_t clli_max;
88 uint32_t clli_avg;
89 /* Mastering Display Color Volume */
90 int have_mdcv;
91 uint16_t mdcv_primaries[3][2];
92 uint16_t mdcv_white_point[2];
93 uint32_t mdcv_max_lum;
94 uint32_t mdcv_min_lum;
95
96 enum PNGHeaderState hdr_state;
97 enum PNGImageState pic_state;
98 int width, height;
99 int cur_w, cur_h;
100 int x_offset, y_offset;
101 uint8_t dispose_op, blend_op;
102 int bit_depth;
103 int color_type;
104 int compression_type;
105 int interlace_type;
106 int filter_type;
107 int channels;
108 int bits_per_pixel;
109 int bpp;
110 int has_trns;
111 uint8_t transparent_color_be[6];
112 int significant_bits;
113
114 uint32_t palette[256];
115 uint8_t *crow_buf;
116 uint8_t *last_row;
117 unsigned int last_row_size;
118 uint8_t *tmp_row;
119 unsigned int tmp_row_size;
120 uint8_t *buffer;
121 int buffer_size;
122 int pass;
123 int crow_size; /* compressed row size (include filter type) */
124 int row_size; /* decompressed row size */
125 int pass_row_size; /* decompress row size of the current pass */
126 int y;
127 FFZStream zstream;
128 } PNGDecContext;
129
130 /* Mask to determine which pixels are valid in a pass */
131 static const uint8_t png_pass_mask[NB_PASSES] = {
132 0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
133 };
134
135 /* Mask to determine which y pixels can be written in a pass */
136 static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
137 0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
138 };
139
140 /* Mask to determine which pixels to overwrite while displaying */
141 static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
142 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
143 };
144
145 /* NOTE: we try to construct a good looking image at each pass. width
146 * is the original image width. We also do pixel format conversion at
147 * this stage */
148 5632 static void png_put_interlaced_row(uint8_t *dst, int width,
149 int bits_per_pixel, int pass,
150 int color_type, const uint8_t *src)
151 {
152 int x, mask, dsp_mask, j, src_x, b, bpp;
153 uint8_t *d;
154 const uint8_t *s;
155
156 5632 mask = png_pass_mask[pass];
157 5632 dsp_mask = png_pass_dsp_mask[pass];
158
159
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 5632 switch (bits_per_pixel) {
160 ✗ case 1:
161 ✗ src_x = 0;
162 ✗ for (x = 0; x < width; x++) {
163 ✗ j = (x & 7);
164 ✗ if ((dsp_mask << j) & 0x80) {
165 ✗ b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
166 ✗ dst[x >> 3] &= 0xFF7F>>j;
167 ✗ dst[x >> 3] |= b << (7 - j);
168 }
169 ✗ if ((mask << j) & 0x80)
170 ✗ src_x++;
171 }
172 ✗ break;
173 ✗ case 2:
174 ✗ src_x = 0;
175 ✗ for (x = 0; x < width; x++) {
176 ✗ int j2 = 2 * (x & 3);
177 ✗ j = (x & 7);
178 ✗ if ((dsp_mask << j) & 0x80) {
179 ✗ b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
180 ✗ dst[x >> 2] &= 0xFF3F>>j2;
181 ✗ dst[x >> 2] |= b << (6 - j2);
182 }
183 ✗ if ((mask << j) & 0x80)
184 ✗ src_x++;
185 }
186 ✗ break;
187 ✗ case 4:
188 ✗ src_x = 0;
189 ✗ for (x = 0; x < width; x++) {
190 ✗ int j2 = 4*(x&1);
191 ✗ j = (x & 7);
192 ✗ if ((dsp_mask << j) & 0x80) {
193 ✗ b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
194 ✗ dst[x >> 1] &= 0xFF0F>>j2;
195 ✗ dst[x >> 1] |= b << (4 - j2);
196 }
197 ✗ if ((mask << j) & 0x80)
198 ✗ src_x++;
199 }
200 ✗ break;
201 5632 default:
202 5632 bpp = bits_per_pixel >> 3;
203 5632 d = dst;
204 5632 s = src;
205
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 726528 for (x = 0; x < width; x++) {
206 720896 j = x & 7;
207
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 720896 if ((dsp_mask << j) & 0x80) {
208 524288 memcpy(d, s, bpp);
209 }
210 720896 d += bpp;
211
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 720896 if ((mask << j) & 0x80)
212 245760 s += bpp;
213 }
214 5632 break;
215 }
216 5632 }
217
218 206463 void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
219 int w, int bpp)
220 {
221 int i;
222
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 99732236 for (i = 0; i < w; i++) {
223 int a, b, c, p, pa, pb, pc;
224
225 99525773 a = dst[i - bpp];
226 99525773 b = top[i];
227 99525773 c = top[i - bpp];
228
229 99525773 p = b - c;
230 99525773 pc = a - c;
231
232 99525773 pa = abs(p);
233 99525773 pb = abs(pc);
234 99525773 pc = abs(p + pc);
235
236
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 99525773 if (pa <= pb && pa <= pc)
237 51626471 p = a;
238
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 47899302 else if (pb <= pc)
239 37661871 p = b;
240 else
241 10237431 p = c;
242 99525773 dst[i] = p + src[i];
243 }
244 206463 }
245
246 #define UNROLL1(bpp, op) \
247 { \
248 r = dst[0]; \
249 if (bpp >= 2) \
250 g = dst[1]; \
251 if (bpp >= 3) \
252 b = dst[2]; \
253 if (bpp >= 4) \
254 a = dst[3]; \
255 for (; i <= size - bpp; i += bpp) { \
256 dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
257 if (bpp == 1) \
258 continue; \
259 dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
260 if (bpp == 2) \
261 continue; \
262 dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
263 if (bpp == 3) \
264 continue; \
265 dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
266 } \
267 }
268
269 #define UNROLL_FILTER(op) \
270 if (bpp == 1) { \
271 UNROLL1(1, op) \
272 } else if (bpp == 2) { \
273 UNROLL1(2, op) \
274 } else if (bpp == 3) { \
275 UNROLL1(3, op) \
276 } else if (bpp == 4) { \
277 UNROLL1(4, op) \
278 } \
279 for (; i < size; i++) { \
280 dst[i] = op(dst[i - bpp], src[i], last[i]); \
281 }
282
283 /* NOTE: 'dst' can be equal to 'last' */
284 130368 void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
285 uint8_t *src, uint8_t *last, int size, int bpp)
286 {
287 int i, p, r, g, b, a;
288
289
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 130368 switch (filter_type) {
290 4782 case PNG_FILTER_VALUE_NONE:
291 4782 memcpy(dst, src, size);
292 4782 break;
293 4764 case PNG_FILTER_VALUE_SUB:
294
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 21769 for (i = 0; i < bpp; i++)
295 17005 dst[i] = src[i];
296
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 4764 if (bpp == 4) {
297 2655 p = *(int *)dst;
298
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 411180 for (; i < size; i += bpp) {
299 408525 unsigned s = *(int *)(src + i);
300 408525 p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
301 408525 *(int *)(dst + i) = p;
302 }
303 } else {
304 #define OP_SUB(x, s, l) ((x) + (s))
305
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 458967 UNROLL_FILTER(OP_SUB);
306 }
307 4764 break;
308 11070 case PNG_FILTER_VALUE_UP:
309 11070 dsp->add_bytes_l2(dst, src, last, size);
310 11070 break;
311 2737 case PNG_FILTER_VALUE_AVG:
312
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 11606 for (i = 0; i < bpp; i++) {
313 8869 p = (last[i] >> 1);
314 8869 dst[i] = p + src[i];
315 }
316 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
317
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 383990 UNROLL_FILTER(OP_AVG);
318 2737 break;
319 107015 case PNG_FILTER_VALUE_PAETH:
320
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 439077 for (i = 0; i < bpp; i++) {
321 332062 p = last[i];
322 332062 dst[i] = p + src[i];
323 }
324
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 107015 if (bpp > 2 && size > 4) {
325 /* would write off the end of the array if we let it process
326 * the last pixel with bpp=3 */
327
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 102927 int w = (bpp & 3) ? size - 3 : size;
328
329
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 102927 if (w > i) {
330 102927 dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
331 102927 i = w;
332 }
333 }
334 107015 ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
335 107015 break;
336 }
337 130368 }
338
339 /* This used to be called "deloco" in FFmpeg
340 * and is actually an inverse reversible colorspace transformation */
341 #define YUV2RGB(NAME, TYPE) \
342 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
343 { \
344 int i; \
345 for (i = 0; i < size - 2; i += 3 + alpha) { \
346 int g = dst [i + 1]; \
347 dst[i + 0] += g; \
348 dst[i + 2] += g; \
349 } \
350 }
351
352 ✗ YUV2RGB(rgb8, uint8_t)
353 ✗ YUV2RGB(rgb16, uint16_t)
354
355 585 static int percent_missing(PNGDecContext *s)
356 {
357
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 585 if (s->interlace_type) {
358 4 return 100 - 100 * s->pass / (NB_PASSES - 1);
359 } else {
360 581 return 100 - 100 * s->y / s->cur_h;
361 }
362 }
363
364 /* process exactly one decompressed row */
365 126127 static void png_handle_row(PNGDecContext *s, uint8_t *dst, ptrdiff_t dst_stride)
366 {
367 uint8_t *ptr, *last_row;
368 int got_line;
369
370
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 126127 if (!s->interlace_type) {
371 124207 ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
372
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 124207 if (s->y == 0)
373 654 last_row = s->last_row;
374 else
375 123553 last_row = ptr - dst_stride;
376
377 124207 ff_png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
378 last_row, s->row_size, s->bpp);
379 /* loco lags by 1 row so that it doesn't interfere with top prediction */
380
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 124207 if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
381 ✗ if (s->bit_depth == 16) {
382 ✗ deloco_rgb16((uint16_t *)(ptr - dst_stride), s->row_size / 2,
383 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
384 } else {
385 ✗ deloco_rgb8(ptr - dst_stride, s->row_size,
386 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
387 }
388 }
389 124207 s->y++;
390
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 124207 if (s->y == s->cur_h) {
391 654 s->pic_state |= PNG_ALLIMAGE;
392
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 654 if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
393 ✗ if (s->bit_depth == 16) {
394 ✗ deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
395 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
396 } else {
397 ✗ deloco_rgb8(ptr, s->row_size,
398 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
399 }
400 }
401 }
402 } else {
403 1920 got_line = 0;
404 for (;;) {
405 9080 ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
406
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 9080 if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
407 /* if we already read one row, it is time to stop to
408 * wait for the next one */
409
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 3832 if (got_line)
410 1912 break;
411 1920 ff_png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
412 s->last_row, s->pass_row_size, s->bpp);
413 1920 FFSWAP(uint8_t *, s->last_row, s->tmp_row);
414 1920 FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
415 1920 got_line = 1;
416 }
417
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 7168 if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
418 5632 png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
419 5632 s->color_type, s->last_row);
420 }
421 7168 s->y++;
422
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 7168 if (s->y == s->cur_h) {
423 56 memset(s->last_row, 0, s->row_size);
424 for (;;) {
425
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 56 if (s->pass == NB_PASSES - 1) {
426 8 s->pic_state |= PNG_ALLIMAGE;
427 8 goto the_end;
428 } else {
429 48 s->pass++;
430 48 s->y = 0;
431 48 s->pass_row_size = ff_png_pass_row_size(s->pass,
432 s->bits_per_pixel,
433 s->cur_w);
434 48 s->crow_size = s->pass_row_size + 1;
435
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 48 if (s->pass_row_size != 0)
436 48 break;
437 /* skip pass if empty row */
438 }
439 }
440 }
441 }
442 1920 the_end:;
443 }
444 126127 }
445
446 12362 static int png_decode_idat(PNGDecContext *s, GetByteContext *gb,
447 uint8_t *dst, ptrdiff_t dst_stride)
448 {
449 12362 z_stream *const zstream = &s->zstream.zstream;
450 int ret;
451 12362 zstream->avail_in = bytestream2_get_bytes_left(gb);
452 12362 zstream->next_in = gb->buffer;
453
454 /* decode one line if possible */
455
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 150157 while (zstream->avail_in > 0) {
456 137795 ret = inflate(zstream, Z_PARTIAL_FLUSH);
457
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 137795 if (ret != Z_OK && ret != Z_STREAM_END) {
458 ✗ av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
459 ✗ return AVERROR_EXTERNAL;
460 }
461
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 137795 if (zstream->avail_out == 0) {
462
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 126127 if (!(s->pic_state & PNG_ALLIMAGE)) {
463 126127 png_handle_row(s, dst, dst_stride);
464 }
465 126127 zstream->avail_out = s->crow_size;
466 126127 zstream->next_out = s->crow_buf;
467 }
468
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 137795 if (ret == Z_STREAM_END && zstream->avail_in > 0) {
469 ✗ av_log(s->avctx, AV_LOG_WARNING,
470 "%d undecompressed bytes left in buffer\n", zstream->avail_in);
471 ✗ return 0;
472 }
473 }
474 12362 return 0;
475 }
476
477 6 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
478 const uint8_t *data_end, void *logctx)
479 {
480 FFZStream z;
481 6 z_stream *const zstream = &z.zstream;
482 unsigned char *buf;
483 unsigned buf_size;
484 6 int ret = ff_inflate_init(&z, logctx);
485
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 6 if (ret < 0)
486 ✗ return ret;
487
488 6 zstream->next_in = data;
489 6 zstream->avail_in = data_end - data;
490 6 av_bprint_init(bp, 0, AV_BPRINT_SIZE_UNLIMITED);
491
492
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 18 while (zstream->avail_in > 0) {
493 18 av_bprint_get_buffer(bp, 2, &buf, &buf_size);
494
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 18 if (buf_size < 2) {
495 ✗ ret = AVERROR(ENOMEM);
496 ✗ goto fail;
497 }
498 18 zstream->next_out = buf;
499 18 zstream->avail_out = buf_size - 1;
500 18 ret = inflate(zstream, Z_PARTIAL_FLUSH);
501
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 18 if (ret != Z_OK && ret != Z_STREAM_END) {
502 ✗ ret = AVERROR_EXTERNAL;
503 ✗ goto fail;
504 }
505 18 bp->len += zstream->next_out - buf;
506
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 18 if (ret == Z_STREAM_END)
507 6 break;
508 }
509 6 ff_inflate_end(&z);
510 6 bp->str[bp->len] = 0;
511 6 return 0;
512
513 ✗ fail:
514 ✗ ff_inflate_end(&z);
515 ✗ av_bprint_finalize(bp, NULL);
516 ✗ return ret;
517 }
518
519 276 static char *iso88591_to_utf8(const char *in, size_t size_in)
520 {
521 276 size_t extra = 0, i;
522 char *out, *q;
523
524
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 4821 for (i = 0; i < size_in; i++)
525 4545 extra += !!(in[i] & 0x80);
526
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 276 if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
527 ✗ return NULL;
528 276 q = out = av_malloc(size_in + extra + 1);
529
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 276 if (!out)
530 ✗ return NULL;
531
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 4821 for (i = 0; i < size_in; i++) {
532
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 4545 if (in[i] & 0x80) {
533 ✗ *(q++) = 0xC0 | (in[i] >> 6);
534 ✗ *(q++) = 0x80 | (in[i] & 0x3F);
535 } else {
536 4545 *(q++) = in[i];
537 }
538 }
539 276 *(q++) = 0;
540 276 return out;
541 }
542
543 138 static int decode_text_chunk(PNGDecContext *s, GetByteContext *gb, int compressed)
544 {
545 int ret, method;
546 138 const uint8_t *data = gb->buffer;
547 138 const uint8_t *data_end = gb->buffer_end;
548 138 const char *keyword = data;
549 138 const char *keyword_end = memchr(keyword, 0, data_end - data);
550 138 char *kw_utf8 = NULL, *txt_utf8 = NULL;
551 const char *text;
552 unsigned text_len;
553 AVBPrint bp;
554
555
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 138 if (!keyword_end)
556 ✗ return AVERROR_INVALIDDATA;
557 138 data = keyword_end + 1;
558
559
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 138 if (compressed) {
560 ✗ if (data == data_end)
561 ✗ return AVERROR_INVALIDDATA;
562 ✗ method = *(data++);
563 ✗ if (method)
564 ✗ return AVERROR_INVALIDDATA;
565 ✗ if ((ret = decode_zbuf(&bp, data, data_end, s->avctx)) < 0)
566 ✗ return ret;
567 ✗ text = bp.str;
568 ✗ text_len = bp.len;
569 } else {
570 138 text = data;
571 138 text_len = data_end - data;
572 }
573
574 138 txt_utf8 = iso88591_to_utf8(text, text_len);
575
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 138 if (compressed)
576 ✗ av_bprint_finalize(&bp, NULL);
577
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 138 if (!txt_utf8)
578 ✗ return AVERROR(ENOMEM);
579 138 kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
580
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 138 if (!kw_utf8) {
581 ✗ av_free(txt_utf8);
582 ✗ return AVERROR(ENOMEM);
583 }
584
585 138 av_dict_set(&s->frame_metadata, kw_utf8, txt_utf8,
586 AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
587 138 return 0;
588 }
589
590 417 static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s,
591 GetByteContext *gb)
592 {
593
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 417 if (bytestream2_get_bytes_left(gb) != 13)
594 ✗ return AVERROR_INVALIDDATA;
595
596
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 417 if (s->pic_state & PNG_IDAT) {
597 ✗ av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
598 ✗ return AVERROR_INVALIDDATA;
599 }
600
601
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 417 if (s->hdr_state & PNG_IHDR) {
602 ✗ av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
603 ✗ return AVERROR_INVALIDDATA;
604 }
605
606 417 s->width = s->cur_w = bytestream2_get_be32(gb);
607 417 s->height = s->cur_h = bytestream2_get_be32(gb);
608
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 417 if (av_image_check_size(s->width, s->height, 0, avctx)) {
609 ✗ s->cur_w = s->cur_h = s->width = s->height = 0;
610 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
611 ✗ return AVERROR_INVALIDDATA;
612 }
613 417 s->bit_depth = bytestream2_get_byte(gb);
614
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 417 if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
615
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 417 s->bit_depth != 8 && s->bit_depth != 16) {
616 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
617 ✗ goto error;
618 }
619 417 s->color_type = bytestream2_get_byte(gb);
620 417 s->compression_type = bytestream2_get_byte(gb);
621
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 417 if (s->compression_type) {
622 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
623 ✗ goto error;
624 }
625 417 s->filter_type = bytestream2_get_byte(gb);
626 417 s->interlace_type = bytestream2_get_byte(gb);
627 417 s->hdr_state |= PNG_IHDR;
628
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 417 if (avctx->debug & FF_DEBUG_PICT_INFO)
629 ✗ av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
630 "compression_type=%d filter_type=%d interlace_type=%d\n",
631 s->width, s->height, s->bit_depth, s->color_type,
632 s->compression_type, s->filter_type, s->interlace_type);
633
634 417 return 0;
635 ✗ error:
636 ✗ s->cur_w = s->cur_h = s->width = s->height = 0;
637 ✗ s->bit_depth = 8;
638 ✗ return AVERROR_INVALIDDATA;
639 }
640
641 384 static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s,
642 GetByteContext *gb)
643 {
644
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 384 if (s->pic_state & PNG_IDAT) {
645 ✗ av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
646 ✗ return AVERROR_INVALIDDATA;
647 }
648 384 avctx->sample_aspect_ratio.num = bytestream2_get_be32(gb);
649 384 avctx->sample_aspect_ratio.den = bytestream2_get_be32(gb);
650
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 384 if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
651 ✗ avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
652 384 bytestream2_skip(gb, 1); /* unit specifier */
653
654 384 return 0;
655 }
656
657 /*
658 * This populates AVCodecContext fields so it must be called before
659 * ff_thread_finish_setup() to avoid a race condition with respect to the
660 * generic copying of avctx fields.
661 */
662 662 static int populate_avctx_color_fields(AVCodecContext *avctx, AVFrame *frame)
663 {
664 662 PNGDecContext *s = avctx->priv_data;
665 int ret;
666
667
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 662 if (s->have_cicp) {
668
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 4 if (s->cicp_primaries >= AVCOL_PRI_NB)
669 ✗ av_log(avctx, AV_LOG_WARNING, "unrecognized cICP primaries\n");
670 else
671 4 avctx->color_primaries = frame->color_primaries = s->cicp_primaries;
672
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 4 if (s->cicp_trc >= AVCOL_TRC_NB)
673 ✗ av_log(avctx, AV_LOG_WARNING, "unrecognized cICP transfer\n");
674 else
675 4 avctx->color_trc = frame->color_trc = s->cicp_trc;
676
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 4 if (s->cicp_range == 0) {
677 ✗ av_log(avctx, AV_LOG_WARNING, "tv-range cICP tag found. Colors may be wrong\n");
678 ✗ avctx->color_range = frame->color_range = AVCOL_RANGE_MPEG;
679
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 4 } else if (s->cicp_range != 1) {
680 /* we already printed a warning when parsing the cICP chunk */
681 ✗ avctx->color_range = frame->color_range = AVCOL_RANGE_UNSPECIFIED;
682 }
683
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 658 } else if (s->iccp_data) {
684 AVFrameSideData *sd;
685 6 ret = ff_frame_new_side_data(avctx, frame, AV_FRAME_DATA_ICC_PROFILE,
686 s->iccp_data_len, &sd);
687
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 6 if (ret < 0)
688 ✗ return ret;
689
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 6 if (sd) {
690 6 memcpy(sd->data, s->iccp_data, s->iccp_data_len);
691 6 av_dict_set(&sd->metadata, "name", s->iccp_name, 0);
692 }
693
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 652 } else if (s->have_srgb) {
694 39 avctx->color_primaries = frame->color_primaries = AVCOL_PRI_BT709;
695 39 avctx->color_trc = frame->color_trc = AVCOL_TRC_IEC61966_2_1;
696
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 613 } else if (s->have_chrm) {
697 AVColorPrimariesDesc desc;
698 enum AVColorPrimaries prim;
699 6 desc.wp.x = av_make_q(s->white_point[0], 100000);
700 6 desc.wp.y = av_make_q(s->white_point[1], 100000);
701 6 desc.prim.r.x = av_make_q(s->display_primaries[0][0], 100000);
702 6 desc.prim.r.y = av_make_q(s->display_primaries[0][1], 100000);
703 6 desc.prim.g.x = av_make_q(s->display_primaries[1][0], 100000);
704 6 desc.prim.g.y = av_make_q(s->display_primaries[1][1], 100000);
705 6 desc.prim.b.x = av_make_q(s->display_primaries[2][0], 100000);
706 6 desc.prim.b.y = av_make_q(s->display_primaries[2][1], 100000);
707 6 prim = av_csp_primaries_id_from_desc(&desc);
708
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 6 if (prim != AVCOL_PRI_UNSPECIFIED)
709 6 avctx->color_primaries = frame->color_primaries = prim;
710 else
711 ✗ av_log(avctx, AV_LOG_WARNING, "unknown cHRM primaries\n");
712 }
713
714 /* these chunks override gAMA */
715
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 662 if (s->iccp_data || s->have_srgb || s->have_cicp) {
716 49 av_dict_set(&s->frame_metadata, "gamma", NULL, 0);
717
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 613 } else if (s->gamma) {
718 /*
719 * These values are 100000/2.2, 100000/2.8, 100000/2.6, and
720 * 100000/1.0 respectively. 45455, 35714, and 38462, and 100000.
721 * There's a 0.001 gamma tolerance here in case of floating
722 * point issues when the PNG was written.
723 *
724 * None of the other enums have a pure gamma curve so it makes
725 * sense to leave those to sRGB and cICP.
726 */
727
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 34 if (s->gamma > 45355 && s->gamma < 45555)
728 26 avctx->color_trc = frame->color_trc = AVCOL_TRC_GAMMA22;
729
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 8 else if (s->gamma > 35614 && s->gamma < 35814)
730 ✗ avctx->color_trc = frame->color_trc = AVCOL_TRC_GAMMA28;
731
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 8 else if (s->gamma > 38362 && s->gamma < 38562)
732 ✗ avctx->color_trc = frame->color_trc = AVCOL_TRC_SMPTE428;
733
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 8 else if (s->gamma > 99900 && s->gamma < 100100)
734 ✗ avctx->color_trc = frame->color_trc = AVCOL_TRC_LINEAR;
735 }
736
737 /* PNG only supports RGB */
738 662 avctx->colorspace = frame->colorspace = AVCOL_SPC_RGB;
739
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 662 if (!s->have_cicp || s->cicp_range == 1)
740 662 avctx->color_range = frame->color_range = AVCOL_RANGE_JPEG;
741
742 /*
743 * tRNS sets alpha depth to full, so we ignore sBIT if set.
744 * As a result we must wait until now to set
745 * avctx->bits_per_raw_sample in case tRNS appears after sBIT
746 */
747
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 662 if (!s->has_trns && s->significant_bits > 0)
748 ✗ avctx->bits_per_raw_sample = s->significant_bits;
749
750
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 662 if (s->have_clli) {
751 AVContentLightMetadata *clli;
752
753 2 ret = ff_decode_content_light_new(avctx, frame, &clli);
754
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 2 if (ret < 0)
755 ✗ return ret;
756
757
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 2 if (clli) {
758 /*
759 * 0.0001 divisor value
760 * see: https://www.w3.org/TR/png-3/#cLLI-chunk
761 */
762 2 clli->MaxCLL = s->clli_max / 10000;
763 2 clli->MaxFALL = s->clli_avg / 10000;
764 }
765 }
766
767
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 662 if (s->have_mdcv) {
768 AVMasteringDisplayMetadata *mdcv;
769
770 2 ret = ff_decode_mastering_display_new(avctx, frame, &mdcv);
771
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 2 if (ret < 0)
772 ✗ return ret;
773
774
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 2 if (mdcv) {
775 2 mdcv->has_primaries = 1;
776
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 8 for (int i = 0; i < 3; i++) {
777 6 mdcv->display_primaries[i][0] = av_make_q(s->mdcv_primaries[i][0], 50000);
778 6 mdcv->display_primaries[i][1] = av_make_q(s->mdcv_primaries[i][1], 50000);
779 }
780 2 mdcv->white_point[0] = av_make_q(s->mdcv_white_point[0], 50000);
781 2 mdcv->white_point[1] = av_make_q(s->mdcv_white_point[1], 50000);
782 2 mdcv->has_luminance = 1;
783 2 mdcv->max_luminance = av_make_q(s->mdcv_max_lum, 10000);
784 2 mdcv->min_luminance = av_make_q(s->mdcv_min_lum, 10000);
785 }
786 }
787
788 662 return 0;
789 }
790
791 12362 static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
792 GetByteContext *gb, AVFrame *p)
793 {
794 int ret;
795
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 12362 size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
796
797
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 12362 if (!p)
798 ✗ return AVERROR_INVALIDDATA;
799
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 12362 if (!(s->hdr_state & PNG_IHDR)) {
800 ✗ av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
801 ✗ return AVERROR_INVALIDDATA;
802 }
803
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 12362 if (!(s->pic_state & PNG_IDAT)) {
804 /* init image info */
805 662 ret = ff_set_dimensions(avctx, s->width, s->height);
806
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 662 if (ret < 0)
807 ✗ return ret;
808
809 662 s->channels = ff_png_get_nb_channels(s->color_type);
810 662 s->bits_per_pixel = s->bit_depth * s->channels;
811 662 s->bpp = (s->bits_per_pixel + 7) >> 3;
812 662 s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
813
814
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 662 if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
815
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 622 s->color_type == PNG_COLOR_TYPE_RGB) {
816 477 avctx->pix_fmt = AV_PIX_FMT_RGB24;
817
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 185 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
818
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 145 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
819 97 avctx->pix_fmt = AV_PIX_FMT_RGBA;
820
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 88 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
821
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 48 s->color_type == PNG_COLOR_TYPE_GRAY) {
822 4 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
823
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 84 } else if (s->bit_depth == 16 &&
824
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 40 s->color_type == PNG_COLOR_TYPE_GRAY) {
825 16 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
826
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 68 } else if (s->bit_depth == 16 &&
827
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 24 s->color_type == PNG_COLOR_TYPE_RGB) {
828 18 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
829
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 50 } else if (s->bit_depth == 16 &&
830
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 6 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
831 4 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
832
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 46 } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
833
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 42 s->color_type == PNG_COLOR_TYPE_PALETTE) {
834
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 42 avctx->pix_fmt = avctx->codec_id == AV_CODEC_ID_APNG ? AV_PIX_FMT_RGBA : AV_PIX_FMT_PAL8;
835
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 4 } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
836 ✗ avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
837
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 4 } else if (s->bit_depth == 8 &&
838
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 2 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
839 2 avctx->pix_fmt = AV_PIX_FMT_YA8;
840
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 2 } else if (s->bit_depth == 16 &&
841
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 2 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
842 2 avctx->pix_fmt = AV_PIX_FMT_YA16BE;
843 } else {
844 ✗ avpriv_report_missing_feature(avctx,
845 "Bit depth %d color type %d",
846 s->bit_depth, s->color_type);
847 ✗ return AVERROR_PATCHWELCOME;
848 }
849
850
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 662 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
851
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 137 switch (avctx->pix_fmt) {
852 137 case AV_PIX_FMT_RGB24:
853 137 avctx->pix_fmt = AV_PIX_FMT_RGBA;
854 137 break;
855
856 ✗ case AV_PIX_FMT_RGB48BE:
857 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
858 ✗ break;
859
860 ✗ case AV_PIX_FMT_GRAY8:
861 ✗ avctx->pix_fmt = AV_PIX_FMT_YA8;
862 ✗ break;
863
864 ✗ case AV_PIX_FMT_GRAY16BE:
865 ✗ avctx->pix_fmt = AV_PIX_FMT_YA16BE;
866 ✗ break;
867
868 ✗ default:
869 ✗ avpriv_request_sample(avctx, "bit depth %d "
870 "and color type %d with TRNS",
871 s->bit_depth, s->color_type);
872 ✗ return AVERROR_INVALIDDATA;
873 }
874
875 137 s->bpp += byte_depth;
876 }
877
878 662 ff_progress_frame_unref(&s->picture);
879
2/2
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 662 if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
880 /* We only need a buffer for the current picture. */
881 1 ret = ff_thread_get_buffer(avctx, p, 0);
882
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 1 if (ret < 0)
883 ✗ return ret;
884
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✓ Branch 1 taken 649 times.
 661 } else if (s->dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
885 /* We need a buffer for the current picture as well as
886 * a buffer for the reference to retain. */
887 12 ret = ff_progress_frame_get_buffer(avctx, &s->picture,
888 AV_GET_BUFFER_FLAG_REF);
889
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 12 if (ret < 0)
890 ✗ return ret;
891 12 ret = ff_thread_get_buffer(avctx, p, 0);
892
1/2
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 12 if (ret < 0)
893 ✗ return ret;
894 } else {
895 /* The picture output this time and the reference to retain coincide. */
896 649 ret = ff_progress_frame_get_buffer(avctx, &s->picture,
897 AV_GET_BUFFER_FLAG_REF);
898
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 649 if (ret < 0)
899 ✗ return ret;
900 649 ret = av_frame_ref(p, s->picture.f);
901
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 649 if (ret < 0)
902 ✗ return ret;
903 }
904
905 662 p->pict_type = AV_PICTURE_TYPE_I;
906 662 p->flags |= AV_FRAME_FLAG_KEY;
907
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 662 p->flags |= AV_FRAME_FLAG_INTERLACED * !!s->interlace_type;
908
909
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 662 if ((ret = populate_avctx_color_fields(avctx, p)) < 0)
910 ✗ return ret;
911 662 ff_thread_finish_setup(avctx);
912
913 /* compute the compressed row size */
914
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 662 if (!s->interlace_type) {
915 654 s->crow_size = s->row_size + 1;
916 } else {
917 8 s->pass = 0;
918 8 s->pass_row_size = ff_png_pass_row_size(s->pass,
919 s->bits_per_pixel,
920 s->cur_w);
921 8 s->crow_size = s->pass_row_size + 1;
922 }
923 ff_dlog(avctx, "row_size=%d crow_size =%d\n",
924 s->row_size, s->crow_size);
925
926 /* copy the palette if needed */
927
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 662 if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
928 ✗ memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
929 /* empty row is used if differencing to the first row */
930 662 av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size);
931
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 662 if (!s->last_row)
932 ✗ return AVERROR_INVALIDDATA;
933
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 662 if (s->interlace_type ||
934
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 654 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
935 109 av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size);
936
1/2
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 109 if (!s->tmp_row)
937 ✗ return AVERROR_INVALIDDATA;
938 }
939 /* compressed row */
940 662 av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
941
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 662 if (!s->buffer)
942 ✗ return AVERROR(ENOMEM);
943
944 /* we want crow_buf+1 to be 16-byte aligned */
945 662 s->crow_buf = s->buffer + 15;
946 662 s->zstream.zstream.avail_out = s->crow_size;
947 662 s->zstream.zstream.next_out = s->crow_buf;
948 }
949
950 12362 s->pic_state |= PNG_IDAT;
951
952 /* set image to non-transparent bpp while decompressing */
953
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✓ Branch 3 taken 42 times.
 12362 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
954 147 s->bpp -= byte_depth;
955
956 12362 ret = png_decode_idat(s, gb, p->data[0], p->linesize[0]);
957
958
4/4
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✓ Branch 3 taken 42 times.
 12362 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
959 147 s->bpp += byte_depth;
960
961
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 12362 if (ret < 0)
962 ✗ return ret;
963
964 12362 return 0;
965 }
966
967 3 static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s,
968 GetByteContext *gb)
969 {
970 3 int length = bytestream2_get_bytes_left(gb);
971 int n, i, r, g, b;
972
973
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 3 if ((length % 3) != 0 || length > 256 * 3)
974 ✗ return AVERROR_INVALIDDATA;
975 /* read the palette */
976 3 n = length / 3;
977
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 711 for (i = 0; i < n; i++) {
978 708 r = bytestream2_get_byte(gb);
979 708 g = bytestream2_get_byte(gb);
980 708 b = bytestream2_get_byte(gb);
981 708 s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
982 }
983
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 63 for (; i < 256; i++)
984 60 s->palette[i] = (0xFFU << 24);
985 3 s->hdr_state |= PNG_PLTE;
986
987 3 return 0;
988 }
989
990 7 static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s,
991 GetByteContext *gb)
992 {
993 7 int length = bytestream2_get_bytes_left(gb);
994 int v, i;
995
996
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 7 if (!(s->hdr_state & PNG_IHDR)) {
997 ✗ av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
998 ✗ return AVERROR_INVALIDDATA;
999 }
1000
1001
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 7 if (s->pic_state & PNG_IDAT) {
1002 ✗ av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
1003 ✗ return AVERROR_INVALIDDATA;
1004 }
1005
1006
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 7 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1007
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 3 if (length > 256 || !(s->hdr_state & PNG_PLTE))
1008 ✗ return AVERROR_INVALIDDATA;
1009
1010
2/2
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 54 for (i = 0; i < length; i++) {
1011 51 unsigned v = bytestream2_get_byte(gb);
1012 51 s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
1013 }
1014
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 4 } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
1015
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 4 if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
1016
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 4 (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
1017
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 4 s->bit_depth == 1)
1018 ✗ return AVERROR_INVALIDDATA;
1019
1020
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 16 for (i = 0; i < length / 2; i++) {
1021 /* only use the least significant bits */
1022 12 v = av_zero_extend(bytestream2_get_be16(gb), s->bit_depth);
1023
1024
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 12 if (s->bit_depth > 8)
1025 ✗ AV_WB16(&s->transparent_color_be[2 * i], v);
1026 else
1027 12 s->transparent_color_be[i] = v;
1028 }
1029 } else {
1030 ✗ return AVERROR_INVALIDDATA;
1031 }
1032
1033 7 s->has_trns = 1;
1034
1035 7 return 0;
1036 }
1037
1038 6 static int decode_iccp_chunk(PNGDecContext *s, GetByteContext *gb)
1039 {
1040 6 int ret, cnt = 0;
1041 AVBPrint bp;
1042
1043
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 132 while ((s->iccp_name[cnt++] = bytestream2_get_byte(gb)) && cnt < 81);
1044
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 6 if (cnt > 80) {
1045 ✗ av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
1046 ✗ ret = AVERROR_INVALIDDATA;
1047 ✗ goto fail;
1048 }
1049
1050
1/2
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 6 if (bytestream2_get_byte(gb) != 0) {
1051 ✗ av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
1052 ✗ ret = AVERROR_INVALIDDATA;
1053 ✗ goto fail;
1054 }
1055
1056
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 6 if ((ret = decode_zbuf(&bp, gb->buffer, gb->buffer_end, s->avctx)) < 0)
1057 ✗ return ret;
1058
1059 6 av_freep(&s->iccp_data);
1060 6 ret = av_bprint_finalize(&bp, (char **)&s->iccp_data);
1061
1/2
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 6 if (ret < 0)
1062 ✗ return ret;
1063 6 s->iccp_data_len = bp.len;
1064
1065 6 return 0;
1066 ✗ fail:
1067 ✗ s->iccp_name[0] = 0;
1068 ✗ return ret;
1069 }
1070
1071 ✗ static int decode_sbit_chunk(AVCodecContext *avctx, PNGDecContext *s,
1072 GetByteContext *gb)
1073 {
1074 ✗ int bits = 0;
1075 int channels;
1076 ✗ int remainder = bytestream2_get_bytes_left(gb);
1077
1078 ✗ if (!(s->hdr_state & PNG_IHDR)) {
1079 ✗ av_log(avctx, AV_LOG_ERROR, "sBIT before IHDR\n");
1080 ✗ return AVERROR_INVALIDDATA;
1081 }
1082
1083 ✗ if (s->pic_state & PNG_IDAT) {
1084 ✗ av_log(avctx, AV_LOG_WARNING, "Ignoring illegal sBIT chunk after IDAT\n");
1085 ✗ return 0;
1086 }
1087
1088 ✗ channels = s->color_type & PNG_COLOR_MASK_PALETTE ? 3 : ff_png_get_nb_channels(s->color_type);
1089
1090 ✗ if (remainder != channels) {
1091 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid sBIT size: %d, expected: %d\n", remainder, channels);
1092 /* not enough space left in chunk to read info */
1093 ✗ if (remainder < channels)
1094 ✗ return 0;
1095 }
1096
1097 ✗ for (int i = 0; i < channels; i++) {
1098 ✗ int b = bytestream2_get_byteu(gb);
1099 ✗ bits = FFMAX(b, bits);
1100 }
1101
1102 ✗ if (bits <= 0 || bits > (s->color_type & PNG_COLOR_MASK_PALETTE ? 8 : s->bit_depth)) {
1103 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid significant bits: %d\n", bits);
1104 ✗ return 0;
1105 }
1106 ✗ s->significant_bits = bits;
1107
1108 ✗ return 0;
1109 }
1110
1111 ✗ static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
1112 {
1113 ✗ if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
1114 int i, j, k;
1115 ✗ uint8_t *pd = p->data[0];
1116 ✗ for (j = 0; j < s->height; j++) {
1117 ✗ i = s->width / 8;
1118 ✗ for (k = 7; k >= 1; k--)
1119 ✗ if ((s->width&7) >= k)
1120 ✗ pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
1121 ✗ for (i--; i >= 0; i--) {
1122 ✗ pd[8*i + 7]= pd[i] & 1;
1123 ✗ pd[8*i + 6]= (pd[i]>>1) & 1;
1124 ✗ pd[8*i + 5]= (pd[i]>>2) & 1;
1125 ✗ pd[8*i + 4]= (pd[i]>>3) & 1;
1126 ✗ pd[8*i + 3]= (pd[i]>>4) & 1;
1127 ✗ pd[8*i + 2]= (pd[i]>>5) & 1;
1128 ✗ pd[8*i + 1]= (pd[i]>>6) & 1;
1129 ✗ pd[8*i + 0]= pd[i]>>7;
1130 }
1131 ✗ pd += p->linesize[0];
1132 }
1133 ✗ } else if (s->bits_per_pixel == 2) {
1134 int i, j;
1135 ✗ uint8_t *pd = p->data[0];
1136 ✗ for (j = 0; j < s->height; j++) {
1137 ✗ i = s->width / 4;
1138 ✗ if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1139 ✗ if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
1140 ✗ if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
1141 ✗ if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
1142 ✗ for (i--; i >= 0; i--) {
1143 ✗ pd[4*i + 3]= pd[i] & 3;
1144 ✗ pd[4*i + 2]= (pd[i]>>2) & 3;
1145 ✗ pd[4*i + 1]= (pd[i]>>4) & 3;
1146 ✗ pd[4*i + 0]= pd[i]>>6;
1147 }
1148 } else {
1149 ✗ if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
1150 ✗ if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
1151 ✗ if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
1152 ✗ for (i--; i >= 0; i--) {
1153 ✗ pd[4*i + 3]= ( pd[i] & 3)*0x55;
1154 ✗ pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
1155 ✗ pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
1156 ✗ pd[4*i + 0]= ( pd[i]>>6 )*0x55;
1157 }
1158 }
1159 ✗ pd += p->linesize[0];
1160 }
1161 ✗ } else if (s->bits_per_pixel == 4) {
1162 int i, j;
1163 ✗ uint8_t *pd = p->data[0];
1164 ✗ for (j = 0; j < s->height; j++) {
1165 ✗ i = s->width/2;
1166 ✗ if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1167 ✗ if (s->width&1) pd[2*i+0]= pd[i]>>4;
1168 ✗ for (i--; i >= 0; i--) {
1169 ✗ pd[2*i + 1] = pd[i] & 15;
1170 ✗ pd[2*i + 0] = pd[i] >> 4;
1171 }
1172 } else {
1173 ✗ if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
1174 ✗ for (i--; i >= 0; i--) {
1175 ✗ pd[2*i + 1] = (pd[i] & 15) * 0x11;
1176 ✗ pd[2*i + 0] = (pd[i] >> 4) * 0x11;
1177 }
1178 }
1179 ✗ pd += p->linesize[0];
1180 }
1181 }
1182 ✗ }
1183
1184 262 static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
1185 GetByteContext *gb)
1186 {
1187 uint32_t sequence_number;
1188 int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
1189
1190
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 262 if (bytestream2_get_bytes_left(gb) != APNG_FCTL_CHUNK_SIZE)
1191 ✗ return AVERROR_INVALIDDATA;
1192
1193
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 262 if (!(s->hdr_state & PNG_IHDR)) {
1194 ✗ av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
1195 ✗ return AVERROR_INVALIDDATA;
1196 }
1197
1198
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 262 if (s->pic_state & PNG_IDAT) {
1199 ✗ av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
1200 ✗ return AVERROR_INVALIDDATA;
1201 }
1202
1203 262 sequence_number = bytestream2_get_be32(gb);
1204 262 cur_w = bytestream2_get_be32(gb);
1205 262 cur_h = bytestream2_get_be32(gb);
1206 262 x_offset = bytestream2_get_be32(gb);
1207 262 y_offset = bytestream2_get_be32(gb);
1208 262 bytestream2_skip(gb, 4); /* delay_num (2), delay_den (2) */
1209 262 dispose_op = bytestream2_get_byte(gb);
1210 262 blend_op = bytestream2_get_byte(gb);
1211
1212
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 262 if (sequence_number == 0 &&
1213
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 16 (cur_w != s->width ||
1214
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 16 cur_h != s->height ||
1215
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 16 x_offset != 0 ||
1216
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 262 y_offset != 0) ||
1217
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 262 cur_w <= 0 || cur_h <= 0 ||
1218
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 262 x_offset < 0 || y_offset < 0 ||
1219
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 262 cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1220 ✗ return AVERROR_INVALIDDATA;
1221
1222
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 262 if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1223 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1224 ✗ return AVERROR_INVALIDDATA;
1225 }
1226
1227
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 262 if ((sequence_number == 0 || !s->last_picture.f) &&
1228 dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1229 // No previous frame to revert to for the first frame
1230 // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1231 ✗ dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1232 }
1233
1234
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 262 if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1235
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 4 avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1236
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 4 avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1237
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 4 avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1238
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 4 avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1239
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 4 avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1240 )) {
1241 // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1242 ✗ blend_op = APNG_BLEND_OP_SOURCE;
1243 }
1244
1245 262 s->cur_w = cur_w;
1246 262 s->cur_h = cur_h;
1247 262 s->x_offset = x_offset;
1248 262 s->y_offset = y_offset;
1249 262 s->dispose_op = dispose_op;
1250 262 s->blend_op = blend_op;
1251
1252 262 return 0;
1253 }
1254
1255 ✗ static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
1256 {
1257 int i, j;
1258 ✗ uint8_t *pd = p->data[0];
1259 ✗ uint8_t *pd_last = s->last_picture.f->data[0];
1260 ✗ int ls = av_image_get_linesize(p->format, s->width, 0);
1261
1262 ✗ ls = FFMIN(ls, s->width * s->bpp);
1263
1264 ✗ ff_progress_frame_await(&s->last_picture, INT_MAX);
1265 ✗ for (j = 0; j < s->height; j++) {
1266 ✗ for (i = 0; i < ls; i++)
1267 ✗ pd[i] += pd_last[i];
1268 ✗ pd += p->linesize[0];
1269 ✗ pd_last += s->last_picture.f->linesize[0];
1270 }
1271 ✗ }
1272
1273 // divide by 255 and round to nearest
1274 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1275 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1276
1277 61 static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s,
1278 AVFrame *p)
1279 {
1280 61 uint8_t *dst = p->data[0];
1281 61 ptrdiff_t dst_stride = p->linesize[0];
1282 61 const uint8_t *src = s->last_picture.f->data[0];
1283 61 ptrdiff_t src_stride = s->last_picture.f->linesize[0];
1284
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 61 const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1285
1286 size_t x, y;
1287
1288
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 61 if (s->blend_op == APNG_BLEND_OP_OVER &&
1289
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 41 avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1290 ✗ avctx->pix_fmt != AV_PIX_FMT_GRAY8A) {
1291 ✗ avpriv_request_sample(avctx, "Blending with pixel format %s",
1292 av_get_pix_fmt_name(avctx->pix_fmt));
1293 ✗ return AVERROR_PATCHWELCOME;
1294 }
1295
1296 61 ff_progress_frame_await(&s->last_picture, INT_MAX);
1297
1298 // copy unchanged rectangles from the last frame
1299
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 2247 for (y = 0; y < s->y_offset; y++)
1300 2186 memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1301
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 3381 for (y = s->y_offset; y < s->y_offset + s->cur_h; y++) {
1302 3320 memcpy(dst + y * dst_stride, src + y * src_stride, s->x_offset * bpp);
1303 3320 memcpy(dst + y * dst_stride + (s->x_offset + s->cur_w) * bpp,
1304 3320 src + y * src_stride + (s->x_offset + s->cur_w) * bpp,
1305 3320 (p->width - s->cur_w - s->x_offset) * bpp);
1306 }
1307
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 2561 for (y = s->y_offset + s->cur_h; y < p->height; y++)
1308 2500 memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1309
1310
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 61 if (s->blend_op == APNG_BLEND_OP_OVER) {
1311 // Perform blending
1312
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 1953 for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1313 1912 uint8_t *foreground = dst + dst_stride * y + bpp * s->x_offset;
1314 1912 const uint8_t *background = src + src_stride * y + bpp * s->x_offset;
1315
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 145177 for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += bpp, background += bpp) {
1316 size_t b;
1317 uint8_t foreground_alpha, background_alpha, output_alpha;
1318 uint8_t output[10];
1319
1320 // Since we might be blending alpha onto alpha, we use the following equations:
1321 // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1322 // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1323
1324
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 143265 switch (avctx->pix_fmt) {
1325 143265 case AV_PIX_FMT_RGBA:
1326 143265 foreground_alpha = foreground[3];
1327 143265 background_alpha = background[3];
1328 143265 break;
1329
1330 ✗ case AV_PIX_FMT_GRAY8A:
1331 ✗ foreground_alpha = foreground[1];
1332 ✗ background_alpha = background[1];
1333 ✗ break;
1334 }
1335
1336
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 143265 if (foreground_alpha == 255)
1337 143265 continue;
1338
1339
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 121583 if (foreground_alpha == 0) {
1340 121583 memcpy(foreground, background, bpp);
1341 121583 continue;
1342 }
1343
1344 ✗ output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1345
1346 ✗ av_assert0(bpp <= 10);
1347
1348 ✗ for (b = 0; b < bpp - 1; ++b) {
1349 ✗ if (output_alpha == 0) {
1350 ✗ output[b] = 0;
1351 ✗ } else if (background_alpha == 255) {
1352 ✗ output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1353 } else {
1354 ✗ output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1355 }
1356 }
1357 ✗ output[b] = output_alpha;
1358 ✗ memcpy(foreground, output, bpp);
1359 }
1360 }
1361 }
1362
1363 61 return 0;
1364 }
1365
1366 12 static void apng_reset_background(PNGDecContext *s, const AVFrame *p)
1367 {
1368 // need to reset a rectangle to black
1369 12 av_unused int ret = av_frame_copy(s->picture.f, p);
1370
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 12 const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1371 12 const ptrdiff_t dst_stride = s->picture.f->linesize[0];
1372 12 uint8_t *dst = s->picture.f->data[0] + s->y_offset * dst_stride + bpp * s->x_offset;
1373
1374 av_assert1(ret >= 0);
1375
1376
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 971 for (size_t y = 0; y < s->cur_h; y++) {
1377 959 memset(dst, 0, bpp * s->cur_w);
1378 959 dst += dst_stride;
1379 }
1380 12 }
1381
1382 679 static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
1383 AVFrame *p, const AVPacket *avpkt)
1384 {
1385 679 const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1386 uint32_t tag, length;
1387 679 int decode_next_dat = 0;
1388 int i, ret;
1389
1390 13883 for (;;) {
1391 GetByteContext gb_chunk;
1392
1393 14562 length = bytestream2_get_bytes_left(&s->gb);
1394
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 14562 if (length <= 0) {
1395
1396
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 355 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1397
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 77 avctx->skip_frame == AVDISCARD_ALL) {
1398 93 return 0;
1399 }
1400
1401
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 278 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1402
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 278 if (!(s->pic_state & PNG_IDAT))
1403 16 return 0;
1404 else
1405 585 goto exit_loop;
1406 }
1407 ✗ av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1408 ✗ if ( s->pic_state & PNG_ALLIMAGE
1409 ✗ && avctx->strict_std_compliance <= FF_COMPLIANCE_NORMAL)
1410 ✗ goto exit_loop;
1411 ✗ ret = AVERROR_INVALIDDATA;
1412 1 goto fail;
1413 }
1414
1415 14207 length = bytestream2_get_be32(&s->gb);
1416
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 14207 if (length > 0x7fffffff || length + 8 > bytestream2_get_bytes_left(&s->gb)) {
1417 1 av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1418 1 ret = AVERROR_INVALIDDATA;
1419 1 goto fail;
1420 }
1421
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 14206 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1422 ✗ uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1423 ✗ uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1424 ✗ if (crc_sig ^ crc_cal) {
1425 ✗ av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1426 ✗ if (avctx->err_recognition & AV_EF_EXPLODE) {
1427 ✗ av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1428 ✗ ret = AVERROR_INVALIDDATA;
1429 ✗ goto fail;
1430 }
1431 ✗ av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1432 ✗ bytestream2_skip(&s->gb, length + 8); /* tag */
1433 135 continue;
1434 }
1435 }
1436 14206 tag = bytestream2_get_le32(&s->gb);
1437
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 14206 if (avctx->debug & FF_DEBUG_STARTCODE)
1438 ✗ av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1439 ✗ av_fourcc2str(tag), length);
1440
1441 14206 bytestream2_init(&gb_chunk, s->gb.buffer, length);
1442 14206 bytestream2_skip(&s->gb, length + 4);
1443
1444
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 14206 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1445
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 11637 avctx->skip_frame == AVDISCARD_ALL) {
1446
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 1467 switch(tag) {
1447 1332 case MKTAG('I', 'H', 'D', 'R'):
1448 case MKTAG('p', 'H', 'Y', 's'):
1449 case MKTAG('t', 'E', 'X', 't'):
1450 case MKTAG('I', 'D', 'A', 'T'):
1451 case MKTAG('t', 'R', 'N', 'S'):
1452 case MKTAG('s', 'R', 'G', 'B'):
1453 case MKTAG('c', 'I', 'C', 'P'):
1454 case MKTAG('c', 'H', 'R', 'M'):
1455 case MKTAG('g', 'A', 'M', 'A'):
1456 1332 break;
1457 135 default:
1458 135 continue;
1459 }
1460 }
1461
1462
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 14071 switch (tag) {
1463 417 case MKTAG('I', 'H', 'D', 'R'):
1464
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 417 if ((ret = decode_ihdr_chunk(avctx, s, &gb_chunk)) < 0)
1465 ✗ goto fail;
1466 417 break;
1467 384 case MKTAG('p', 'H', 'Y', 's'):
1468
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 384 if ((ret = decode_phys_chunk(avctx, s, &gb_chunk)) < 0)
1469 ✗ goto fail;
1470 384 break;
1471 262 case MKTAG('f', 'c', 'T', 'L'):
1472
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 262 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1473 ✗ continue;
1474
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 262 if ((ret = decode_fctl_chunk(avctx, s, &gb_chunk)) < 0)
1475 ✗ goto fail;
1476 262 decode_next_dat = 1;
1477 262 break;
1478 2054 case MKTAG('f', 'd', 'A', 'T'):
1479
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 2054 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1480 ✗ continue;
1481
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 2054 if (!decode_next_dat || bytestream2_get_bytes_left(&gb_chunk) < 4) {
1482 ✗ ret = AVERROR_INVALIDDATA;
1483 ✗ goto fail;
1484 }
1485 2054 bytestream2_get_be32(&gb_chunk);
1486 /* fallthrough */
1487 12362 case MKTAG('I', 'D', 'A', 'T'):
1488
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 12362 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1489 ✗ continue;
1490
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 12362 if ((ret = decode_idat_chunk(avctx, s, &gb_chunk, p)) < 0)
1491 ✗ goto fail;
1492 12362 break;
1493 3 case MKTAG('P', 'L', 'T', 'E'):
1494 3 decode_plte_chunk(avctx, s, &gb_chunk);
1495 3 break;
1496 7 case MKTAG('t', 'R', 'N', 'S'):
1497 7 decode_trns_chunk(avctx, s, &gb_chunk);
1498 7 break;
1499 138 case MKTAG('t', 'E', 'X', 't'):
1500
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 138 if (decode_text_chunk(s, &gb_chunk, 0) < 0)
1501 ✗ av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1502 138 break;
1503 ✗ case MKTAG('z', 'T', 'X', 't'):
1504 ✗ if (decode_text_chunk(s, &gb_chunk, 1) < 0)
1505 ✗ av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1506 ✗ break;
1507 ✗ case MKTAG('s', 'T', 'E', 'R'): {
1508 ✗ int mode = bytestream2_get_byte(&gb_chunk);
1509
1510 ✗ if (mode == 0 || mode == 1) {
1511 ✗ s->stereo_mode = mode;
1512 } else {
1513 ✗ av_log(avctx, AV_LOG_WARNING,
1514 "Unknown value in sTER chunk (%d)\n", mode);
1515 }
1516 ✗ break;
1517 }
1518 4 case MKTAG('c', 'I', 'C', 'P'):
1519 4 s->cicp_primaries = bytestream2_get_byte(&gb_chunk);
1520 4 s->cicp_trc = bytestream2_get_byte(&gb_chunk);
1521
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 4 if (bytestream2_get_byte(&gb_chunk) != 0)
1522 ✗ av_log(avctx, AV_LOG_WARNING, "nonzero cICP matrix\n");
1523 4 s->cicp_range = bytestream2_get_byte(&gb_chunk);
1524
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 4 if (s->cicp_range != 0 && s->cicp_range != 1)
1525 ✗ av_log(avctx, AV_LOG_WARNING, "invalid cICP range: %d\n", s->cicp_range);
1526 4 s->have_cicp = 1;
1527 4 break;
1528 39 case MKTAG('s', 'R', 'G', 'B'):
1529 /* skip rendering intent byte */
1530 39 bytestream2_skip(&gb_chunk, 1);
1531 39 s->have_srgb = 1;
1532 39 break;
1533 6 case MKTAG('i', 'C', 'C', 'P'): {
1534
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✓ Branch 2 taken 6 times.
 6 if ((ret = decode_iccp_chunk(s, &gb_chunk)) < 0)
1535 ✗ goto fail;
1536 6 break;
1537 }
1538 16 case MKTAG('c', 'H', 'R', 'M'): {
1539 16 s->have_chrm = 1;
1540
1541 16 s->white_point[0] = bytestream2_get_be32(&gb_chunk);
1542 16 s->white_point[1] = bytestream2_get_be32(&gb_chunk);
1543
1544 /* RGB Primaries */
1545
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 64 for (i = 0; i < 3; i++) {
1546 48 s->display_primaries[i][0] = bytestream2_get_be32(&gb_chunk);
1547 48 s->display_primaries[i][1] = bytestream2_get_be32(&gb_chunk);
1548 }
1549
1550 16 break;
1551 }
1552 ✗ case MKTAG('s', 'B', 'I', 'T'):
1553 ✗ if ((ret = decode_sbit_chunk(avctx, s, &gb_chunk)) < 0)
1554 ✗ goto fail;
1555 ✗ break;
1556 34 case MKTAG('g', 'A', 'M', 'A'): {
1557 AVBPrint bp;
1558 char *gamma_str;
1559 34 s->gamma = bytestream2_get_be32(&gb_chunk);
1560
1561 34 av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
1562 34 av_bprintf(&bp, "%i/%i", s->gamma, 100000);
1563 34 ret = av_bprint_finalize(&bp, &gamma_str);
1564
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 34 if (ret < 0)
1565 ✗ return ret;
1566
1567 34 av_dict_set(&s->frame_metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1568
1569 34 break;
1570 }
1571 2 case MKTAG('c', 'L', 'L', 'i'): /* legacy spelling, for backwards compat */
1572 case MKTAG('c', 'L', 'L', 'I'):
1573
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 2 if (bytestream2_get_bytes_left(&gb_chunk) != 8) {
1574 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid cLLI chunk size: %d\n", bytestream2_get_bytes_left(&gb_chunk));
1575 ✗ break;
1576 }
1577 2 s->have_clli = 1;
1578 2 s->clli_max = bytestream2_get_be32u(&gb_chunk);
1579 2 s->clli_avg = bytestream2_get_be32u(&gb_chunk);
1580 2 break;
1581 2 case MKTAG('m', 'D', 'C', 'v'): /* legacy spelling, for backward compat */
1582 case MKTAG('m', 'D', 'C', 'V'):
1583
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 2 if (bytestream2_get_bytes_left(&gb_chunk) != 24) {
1584 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid mDCV chunk size: %d\n", bytestream2_get_bytes_left(&gb_chunk));
1585 ✗ break;
1586 }
1587 2 s->have_mdcv = 1;
1588
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 8 for (int i = 0; i < 3; i++) {
1589 6 s->mdcv_primaries[i][0] = bytestream2_get_be16u(&gb_chunk);
1590 6 s->mdcv_primaries[i][1] = bytestream2_get_be16u(&gb_chunk);
1591 }
1592 2 s->mdcv_white_point[0] = bytestream2_get_be16u(&gb_chunk);
1593 2 s->mdcv_white_point[1] = bytestream2_get_be16u(&gb_chunk);
1594 2 s->mdcv_max_lum = bytestream2_get_be32u(&gb_chunk);
1595 2 s->mdcv_min_lum = bytestream2_get_be32u(&gb_chunk);
1596 2 break;
1597 323 case MKTAG('I', 'E', 'N', 'D'):
1598
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 323 if (!(s->pic_state & PNG_ALLIMAGE))
1599 ✗ av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1600
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 323 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1601 ✗ ret = AVERROR_INVALIDDATA;
1602 ✗ goto fail;
1603 }
1604 323 goto exit_loop;
1605 }
1606 }
1607 585 exit_loop:
1608
1609
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 585 if (!p)
1610 ✗ return AVERROR_INVALIDDATA;
1611
1612
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 585 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1613
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 323 avctx->skip_frame == AVDISCARD_ALL) {
1614 ✗ return 0;
1615 }
1616
1617
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 585 if (percent_missing(s) > avctx->discard_damaged_percentage) {
1618 ✗ ret = AVERROR_INVALIDDATA;
1619 ✗ goto fail;
1620 }
1621
1622
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 585 if (s->bits_per_pixel <= 4)
1623 ✗ handle_small_bpp(s, p);
1624
1625
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 585 if (s->color_type == PNG_COLOR_TYPE_PALETTE && avctx->codec_id == AV_CODEC_ID_APNG) {
1626
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 6342 for (int y = 0; y < s->height; y++) {
1627 6300 uint8_t *row = &p->data[0][p->linesize[0] * y];
1628
1629
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 951300 for (int x = s->width - 1; x >= 0; x--) {
1630 945000 const uint8_t idx = row[x];
1631
1632 945000 row[4*x+2] = s->palette[idx] & 0xFF;
1633 945000 row[4*x+1] = (s->palette[idx] >> 8 ) & 0xFF;
1634 945000 row[4*x+0] = (s->palette[idx] >> 16) & 0xFF;
1635 945000 row[4*x+3] = s->palette[idx] >> 24;
1636 }
1637 }
1638 }
1639
1640 /* apply transparency if needed */
1641
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 585 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1642
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 136 size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1643 136 size_t raw_bpp = s->bpp - byte_depth;
1644 ptrdiff_t x, y;
1645
1646
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 136 av_assert0(s->bit_depth > 1);
1647
1648
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 17746 for (y = 0; y < s->height; ++y) {
1649 17610 uint8_t *row = &p->data[0][p->linesize[0] * y];
1650
1651
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 17610 if (s->bpp == 2 && byte_depth == 1) {
1652 ✗ uint8_t *pixel = &row[2 * s->width - 1];
1653 ✗ uint8_t *rowp = &row[1 * s->width - 1];
1654 ✗ int tcolor = s->transparent_color_be[0];
1655 ✗ for (x = s->width; x > 0; --x) {
1656 ✗ *pixel-- = *rowp == tcolor ? 0 : 0xff;
1657 ✗ *pixel-- = *rowp--;
1658 }
1659
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 35220 } else if (s->bpp == 4 && byte_depth == 1) {
1660 17610 uint8_t *pixel = &row[4 * s->width - 1];
1661 17610 uint8_t *rowp = &row[3 * s->width - 1];
1662 17610 int tcolor = AV_RL24(s->transparent_color_be);
1663
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 1595310 for (x = s->width; x > 0; --x) {
1664
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 1577700 *pixel-- = AV_RL24(rowp-2) == tcolor ? 0 : 0xff;
1665 1577700 *pixel-- = *rowp--;
1666 1577700 *pixel-- = *rowp--;
1667 1577700 *pixel-- = *rowp--;
1668 }
1669 } else {
1670 /* since we're updating in-place, we have to go from right to left */
1671 ✗ for (x = s->width; x > 0; --x) {
1672 ✗ uint8_t *pixel = &row[s->bpp * (x - 1)];
1673 ✗ memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1674
1675 ✗ if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1676 ✗ memset(&pixel[raw_bpp], 0, byte_depth);
1677 } else {
1678 ✗ memset(&pixel[raw_bpp], 0xff, byte_depth);
1679 }
1680 }
1681 }
1682 }
1683 }
1684
1685 /* handle P-frames only if a predecessor frame is available */
1686
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 585 if (s->last_picture.f) {
1687
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 506 if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1688
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 61 && s->last_picture.f->width == p->width
1689
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 61 && s->last_picture.f->height== p->height
1690
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 61 && s->last_picture.f->format== p->format
1691 ) {
1692
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 61 if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1693 ✗ handle_p_frame_png(s, p);
1694 61 else if (CONFIG_APNG_DECODER &&
1695
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 122 avctx->codec_id == AV_CODEC_ID_APNG &&
1696 61 (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1697 ✗ goto fail;
1698 }
1699 }
1700
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 585 if (CONFIG_APNG_DECODER && s->dispose_op == APNG_DISPOSE_OP_BACKGROUND)
1701 12 apng_reset_background(s, p);
1702
1703 585 ret = 0;
1704 586 fail:
1705
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 586 if (s->picture.f)
1706 584 ff_progress_frame_report(&s->picture, INT_MAX);
1707
1708 586 return ret;
1709 }
1710
1711 663 static void clear_frame_metadata(PNGDecContext *s)
1712 {
1713 663 av_freep(&s->iccp_data);
1714 663 s->iccp_data_len = 0;
1715 663 s->iccp_name[0] = 0;
1716
1717 663 s->stereo_mode = -1;
1718
1719 663 s->have_chrm = 0;
1720 663 s->have_srgb = 0;
1721 663 s->have_cicp = 0;
1722
1723 663 av_dict_free(&s->frame_metadata);
1724 663 }
1725
1726 585 static int output_frame(PNGDecContext *s, AVFrame *f)
1727 {
1728 int ret;
1729
1730
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 585 if (s->stereo_mode >= 0) {
1731 ✗ AVStereo3D *stereo3d = av_stereo3d_create_side_data(f);
1732 ✗ if (!stereo3d) {
1733 ✗ ret = AVERROR(ENOMEM);
1734 ✗ goto fail;
1735 }
1736
1737 ✗ stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1738 ✗ stereo3d->flags = s->stereo_mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1739 }
1740
1741 585 FFSWAP(AVDictionary*, f->metadata, s->frame_metadata);
1742
1743 585 return 0;
1744 ✗ fail:
1745 ✗ av_frame_unref(f);
1746 ✗ return ret;
1747 }
1748
1749 #if CONFIG_PNG_DECODER
1750 401 static int decode_frame_png(AVCodecContext *avctx, AVFrame *p,
1751 int *got_frame, AVPacket *avpkt)
1752 {
1753 401 PNGDecContext *const s = avctx->priv_data;
1754 401 const uint8_t *buf = avpkt->data;
1755 401 int buf_size = avpkt->size;
1756 int64_t sig;
1757 int ret;
1758
1759 401 clear_frame_metadata(s);
1760
1761 401 bytestream2_init(&s->gb, buf, buf_size);
1762
1763 /* check signature */
1764 401 sig = bytestream2_get_be64(&s->gb);
1765
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 401 if (sig != PNGSIG &&
1766 sig != MNGSIG) {
1767 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1768 ✗ return AVERROR_INVALIDDATA;
1769 }
1770
1771 401 s->y = s->has_trns = 0;
1772 401 s->hdr_state = 0;
1773 401 s->pic_state = 0;
1774
1775 /* Reset z_stream */
1776 401 ret = inflateReset(&s->zstream.zstream);
1777
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 401 if (ret != Z_OK)
1778 ✗ return AVERROR_EXTERNAL;
1779
1780
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 401 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1781 1 goto the_end;
1782
1783
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 400 if (avctx->skip_frame == AVDISCARD_ALL) {
1784 77 *got_frame = 0;
1785 77 ret = bytestream2_tell(&s->gb);
1786 77 goto the_end;
1787 }
1788
1789 323 ret = output_frame(s, p);
1790
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 323 if (ret < 0)
1791 ✗ goto the_end;
1792
1793
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 323 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1794 323 ff_progress_frame_unref(&s->last_picture);
1795 323 FFSWAP(ProgressFrame, s->picture, s->last_picture);
1796 }
1797
1798 323 *got_frame = 1;
1799
1800 323 ret = bytestream2_tell(&s->gb);
1801 401 the_end:
1802 401 s->crow_buf = NULL;
1803 401 return ret;
1804 }
1805 #endif
1806
1807 #if CONFIG_APNG_DECODER
1808 262 static int decode_frame_apng(AVCodecContext *avctx, AVFrame *p,
1809 int *got_frame, AVPacket *avpkt)
1810 {
1811 262 PNGDecContext *const s = avctx->priv_data;
1812 int ret;
1813
1814 262 clear_frame_metadata(s);
1815
1816
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 262 if (!(s->hdr_state & PNG_IHDR)) {
1817
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 16 if (!avctx->extradata_size)
1818 ✗ return AVERROR_INVALIDDATA;
1819
1820
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 16 if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1821 ✗ return AVERROR_EXTERNAL;
1822 16 bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1823
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 16 if ((ret = decode_frame_common(avctx, s, NULL, avpkt)) < 0)
1824 ✗ return ret;
1825 }
1826
1827 /* reset state for a new frame */
1828
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 262 if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1829 ✗ return AVERROR_EXTERNAL;
1830 262 s->y = 0;
1831 262 s->pic_state = 0;
1832 262 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1833
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 262 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1834 ✗ return ret;
1835
1836
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 262 if (!(s->pic_state & PNG_ALLIMAGE))
1837 ✗ av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1838
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 262 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT)))
1839 ✗ return AVERROR_INVALIDDATA;
1840
1841 262 ret = output_frame(s, p);
1842
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 262 if (ret < 0)
1843 ✗ return ret;
1844
1845
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 262 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1846
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 262 if (s->dispose_op != APNG_DISPOSE_OP_PREVIOUS)
1847 261 FFSWAP(ProgressFrame, s->picture, s->last_picture);
1848 262 ff_progress_frame_unref(&s->picture);
1849 }
1850
1851 262 *got_frame = 1;
1852 262 return bytestream2_tell(&s->gb);
1853 }
1854 #endif
1855
1856 #if HAVE_THREADS
1857 ✗ static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1858 {
1859 ✗ PNGDecContext *psrc = src->priv_data;
1860 ✗ PNGDecContext *pdst = dst->priv_data;
1861 const ProgressFrame *src_frame;
1862
1863 ✗ if (dst == src)
1864 ✗ return 0;
1865
1866 ✗ if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1867
1868 ✗ pdst->width = psrc->width;
1869 ✗ pdst->height = psrc->height;
1870 ✗ pdst->bit_depth = psrc->bit_depth;
1871 ✗ pdst->color_type = psrc->color_type;
1872 ✗ pdst->compression_type = psrc->compression_type;
1873 ✗ pdst->interlace_type = psrc->interlace_type;
1874 ✗ pdst->filter_type = psrc->filter_type;
1875 ✗ pdst->has_trns = psrc->has_trns;
1876 ✗ memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1877
1878 ✗ memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1879
1880 ✗ pdst->hdr_state |= psrc->hdr_state;
1881 }
1882
1883 ✗ src_frame = psrc->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
1884 &psrc->last_picture : &psrc->picture;
1885
1886 ✗ ff_progress_frame_replace(&pdst->last_picture, src_frame);
1887
1888 ✗ return 0;
1889 }
1890 #endif
1891
1892 161 static av_cold int png_dec_init(AVCodecContext *avctx)
1893 {
1894 161 PNGDecContext *s = avctx->priv_data;
1895
1896 161 s->avctx = avctx;
1897
1898 161 ff_pngdsp_init(&s->dsp);
1899
1900 161 return ff_inflate_init(&s->zstream, avctx);
1901 }
1902
1903 161 static av_cold int png_dec_end(AVCodecContext *avctx)
1904 {
1905 161 PNGDecContext *s = avctx->priv_data;
1906
1907 161 ff_progress_frame_unref(&s->last_picture);
1908 161 ff_progress_frame_unref(&s->picture);
1909 161 av_freep(&s->buffer);
1910 161 s->buffer_size = 0;
1911 161 av_freep(&s->last_row);
1912 161 s->last_row_size = 0;
1913 161 av_freep(&s->tmp_row);
1914 161 s->tmp_row_size = 0;
1915
1916 161 av_freep(&s->iccp_data);
1917 161 av_dict_free(&s->frame_metadata);
1918 161 ff_inflate_end(&s->zstream);
1919
1920 161 return 0;
1921 }
1922
1923 #if CONFIG_APNG_DECODER
1924 const FFCodec ff_apng_decoder = {
1925 .p.name = "apng",
1926 CODEC_LONG_NAME("APNG (Animated Portable Network Graphics) image"),
1927 .p.type = AVMEDIA_TYPE_VIDEO,
1928 .p.id = AV_CODEC_ID_APNG,
1929 .priv_data_size = sizeof(PNGDecContext),
1930 .init = png_dec_init,
1931 .close = png_dec_end,
1932 FF_CODEC_DECODE_CB(decode_frame_apng),
1933 UPDATE_THREAD_CONTEXT(update_thread_context),
1934 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
1935 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
1936 FF_CODEC_CAP_USES_PROGRESSFRAMES |
1937 FF_CODEC_CAP_ICC_PROFILES,
1938 };
1939 #endif
1940
1941 #if CONFIG_PNG_DECODER
1942 const FFCodec ff_png_decoder = {
1943 .p.name = "png",
1944 CODEC_LONG_NAME("PNG (Portable Network Graphics) image"),
1945 .p.type = AVMEDIA_TYPE_VIDEO,
1946 .p.id = AV_CODEC_ID_PNG,
1947 .priv_data_size = sizeof(PNGDecContext),
1948 .init = png_dec_init,
1949 .close = png_dec_end,
1950 FF_CODEC_DECODE_CB(decode_frame_png),
1951 UPDATE_THREAD_CONTEXT(update_thread_context),
1952 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
1953 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
1954 FF_CODEC_CAP_INIT_CLEANUP |
1955 FF_CODEC_CAP_USES_PROGRESSFRAMES |
1956 FF_CODEC_CAP_ICC_PROFILES,
1957 };
1958 #endif
1959