FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/pngdec.c
Date: 2026-01-14 03:33:33
Exec Total Coverage
Lines: 723 1178 61.4%
Functions: 26 33 78.8%
Branches: 480 899 53.4%
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 "exif_internal.h"
43 #include "apng.h"
44 #include "png.h"
45 #include "pngdsp.h"
46 #include "progressframe.h"
47 #include "thread.h"
48 #include "zlib_wrapper.h"
49
50 #include <zlib.h>
51
52 enum PNGHeaderState {
53 PNG_IHDR = 1 << 0,
54 PNG_PLTE = 1 << 1,
55 };
56
57 enum PNGImageState {
58 PNG_IDAT = 1 << 0,
59 PNG_ALLIMAGE = 1 << 1,
60 };
61
62 typedef struct PNGDecContext {
63 PNGDSPContext dsp;
64 AVCodecContext *avctx;
65
66 GetByteContext gb;
67 ProgressFrame last_picture;
68 ProgressFrame picture;
69
70 AVDictionary *frame_metadata;
71
72 uint8_t iccp_name[82];
73 uint8_t *iccp_data;
74 size_t iccp_data_len;
75
76 int stereo_mode;
77
78 int have_chrm;
79 uint32_t white_point[2];
80 uint32_t display_primaries[3][2];
81 int gamma;
82 int have_srgb;
83 int have_cicp;
84 enum AVColorPrimaries cicp_primaries;
85 enum AVColorTransferCharacteristic cicp_trc;
86 enum AVColorRange cicp_range;
87 int have_clli;
88 uint32_t clli_max;
89 uint32_t clli_avg;
90 /* Mastering Display Color Volume */
91 int have_mdcv;
92 uint16_t mdcv_primaries[3][2];
93 uint16_t mdcv_white_point[2];
94 uint32_t mdcv_max_lum;
95 uint32_t mdcv_min_lum;
96
97 enum PNGHeaderState hdr_state;
98 enum PNGImageState pic_state;
99 int width, height;
100 int cur_w, cur_h;
101 int x_offset, y_offset;
102 uint8_t dispose_op, blend_op;
103 int bit_depth;
104 int color_type;
105 int compression_type;
106 int interlace_type;
107 int filter_type;
108 int channels;
109 int bits_per_pixel;
110 int bpp;
111 int has_trns;
112 uint8_t transparent_color_be[6];
113 int significant_bits;
114
115 uint32_t palette[256];
116 uint8_t *crow_buf;
117 uint8_t *last_row;
118 unsigned int last_row_size;
119 uint8_t *tmp_row;
120 unsigned int tmp_row_size;
121 uint8_t *buffer;
122 int buffer_size;
123 int pass;
124 int crow_size; /* compressed row size (include filter type) */
125 int row_size; /* decompressed row size */
126 int pass_row_size; /* decompress row size of the current pass */
127 int y;
128 FFZStream zstream;
129
130 AVBufferRef *exif_data;
131 } PNGDecContext;
132
133 /* Mask to determine which pixels are valid in a pass */
134 static const uint8_t png_pass_mask[NB_PASSES] = {
135 0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
136 };
137
138 /* Mask to determine which y pixels can be written in a pass */
139 static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
140 0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
141 };
142
143 /* Mask to determine which pixels to overwrite while displaying */
144 static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
145 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
146 };
147
148 /* NOTE: we try to construct a good looking image at each pass. width
149 * is the original image width. We also do pixel format conversion at
150 * this stage */
151 5632 static void png_put_interlaced_row(uint8_t *dst, int width,
152 int bits_per_pixel, int pass,
153 int color_type, const uint8_t *src)
154 {
155 int x, mask, dsp_mask, j, src_x, b, bpp;
156 uint8_t *d;
157 const uint8_t *s;
158
159 5632 mask = png_pass_mask[pass];
160 5632 dsp_mask = png_pass_dsp_mask[pass];
161
162
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 5632 switch (bits_per_pixel) {
163 ✗ case 1:
164 ✗ src_x = 0;
165 ✗ for (x = 0; x < width; x++) {
166 ✗ j = (x & 7);
167 ✗ if ((dsp_mask << j) & 0x80) {
168 ✗ b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
169 ✗ dst[x >> 3] &= 0xFF7F>>j;
170 ✗ dst[x >> 3] |= b << (7 - j);
171 }
172 ✗ if ((mask << j) & 0x80)
173 ✗ src_x++;
174 }
175 ✗ break;
176 ✗ case 2:
177 ✗ src_x = 0;
178 ✗ for (x = 0; x < width; x++) {
179 ✗ int j2 = 2 * (x & 3);
180 ✗ j = (x & 7);
181 ✗ if ((dsp_mask << j) & 0x80) {
182 ✗ b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
183 ✗ dst[x >> 2] &= 0xFF3F>>j2;
184 ✗ dst[x >> 2] |= b << (6 - j2);
185 }
186 ✗ if ((mask << j) & 0x80)
187 ✗ src_x++;
188 }
189 ✗ break;
190 ✗ case 4:
191 ✗ src_x = 0;
192 ✗ for (x = 0; x < width; x++) {
193 ✗ int j2 = 4*(x&1);
194 ✗ j = (x & 7);
195 ✗ if ((dsp_mask << j) & 0x80) {
196 ✗ b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
197 ✗ dst[x >> 1] &= 0xFF0F>>j2;
198 ✗ dst[x >> 1] |= b << (4 - j2);
199 }
200 ✗ if ((mask << j) & 0x80)
201 ✗ src_x++;
202 }
203 ✗ break;
204 5632 default:
205 5632 bpp = bits_per_pixel >> 3;
206 5632 d = dst;
207 5632 s = src;
208
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 726528 for (x = 0; x < width; x++) {
209 720896 j = x & 7;
210
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 720896 if ((dsp_mask << j) & 0x80) {
211 524288 memcpy(d, s, bpp);
212 }
213 720896 d += bpp;
214
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 720896 if ((mask << j) & 0x80)
215 245760 s += bpp;
216 }
217 5632 break;
218 }
219 5632 }
220
221 #define UNROLL1(bpp, op) \
222 { \
223 r = dst[0]; \
224 if (bpp >= 2) \
225 g = dst[1]; \
226 if (bpp >= 3) \
227 b = dst[2]; \
228 if (bpp >= 4) \
229 a = dst[3]; \
230 for (; i <= size - bpp; i += bpp) { \
231 dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
232 if (bpp == 1) \
233 continue; \
234 dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
235 if (bpp == 2) \
236 continue; \
237 dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
238 if (bpp == 3) \
239 continue; \
240 dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
241 } \
242 }
243
244 #define UNROLL_FILTER(op) \
245 if (bpp == 1) { \
246 UNROLL1(1, op) \
247 } else if (bpp == 2) { \
248 UNROLL1(2, op) \
249 } else if (bpp == 3) { \
250 UNROLL1(3, op) \
251 } else if (bpp == 4) { \
252 UNROLL1(4, op) \
253 } \
254 for (; i < size; i++) { \
255 dst[i] = op(dst[i - bpp], src[i], last[i]); \
256 }
257
258 /* NOTE: 'dst' can be equal to 'last' */
259 131568 void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
260 const uint8_t *src, const uint8_t *last, int size, int bpp)
261 {
262 int i, p, r, g, b, a;
263
264
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 131568 switch (filter_type) {
265 4782 case PNG_FILTER_VALUE_NONE:
266 4782 memcpy(dst, src, size);
267 4782 break;
268 4768 case PNG_FILTER_VALUE_SUB:
269
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 21785 for (i = 0; i < bpp; i++)
270 17017 dst[i] = src[i];
271
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 4768 if (bpp == 4) {
272 2655 p = *(int *)dst;
273
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 411180 for (; i < size; i += bpp) {
274 408525 unsigned s = *(const int *)(src + i);
275 408525 p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
276 408525 *(int *)(dst + i) = p;
277 }
278 } else {
279 #define OP_SUB(x, s, l) ((x) + (s))
280
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 459767 UNROLL_FILTER(OP_SUB);
281 }
282 4768 break;
283 11070 case PNG_FILTER_VALUE_UP:
284 11070 dsp->add_bytes_l2(dst, src, last, size);
285 11070 break;
286 2737 case PNG_FILTER_VALUE_AVG:
287
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 11606 for (i = 0; i < bpp; i++) {
288 8869 p = (last[i] >> 1);
289 8869 dst[i] = p + src[i];
290 }
291 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
292
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 383990 UNROLL_FILTER(OP_AVG);
293 2737 break;
294 108211 case PNG_FILTER_VALUE_PAETH:
295
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 443861 for (i = 0; i < bpp; i++) {
296 335650 p = last[i];
297 335650 dst[i] = p + src[i];
298 }
299
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 108211 if (bpp > 2 && size > 4) {
300 /* would write off the end of the array if we let it process
301 * the last pixel with bpp=3 */
302
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 104123 int w = (bpp & 3) ? size - 3 : size;
303
304
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 104123 if (w > i) {
305 104123 dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
306 104123 i = w;
307 }
308 }
309 108211 ff_png_add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
310 108211 break;
311 }
312 131568 }
313
314 /* This used to be called "deloco" in FFmpeg
315 * and is actually an inverse reversible colorspace transformation */
316 #define YUV2RGB(NAME, TYPE) \
317 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
318 { \
319 int i; \
320 for (i = 0; i < size - 2; i += 3 + alpha) { \
321 int g = dst [i + 1]; \
322 dst[i + 0] += g; \
323 dst[i + 2] += g; \
324 } \
325 }
326
327 ✗ YUV2RGB(rgb8, uint8_t)
328 ✗ YUV2RGB(rgb16, uint16_t)
329
330 587 static int percent_missing(PNGDecContext *s)
331 {
332
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 587 if (s->interlace_type) {
333 4 return 100 - 100 * s->pass / (NB_PASSES - 1);
334 } else {
335 583 return 100 - 100 * s->y / s->cur_h;
336 }
337 }
338
339 /* process exactly one decompressed row */
340 127327 static void png_handle_row(PNGDecContext *s, uint8_t *dst, ptrdiff_t dst_stride)
341 {
342 uint8_t *ptr, *last_row;
343 int got_line;
344
345
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 127327 if (!s->interlace_type) {
346 125407 ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
347
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 125407 if (s->y == 0)
348 658 last_row = s->last_row;
349 else
350 124749 last_row = ptr - dst_stride;
351
352 125407 ff_png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
353 last_row, s->row_size, s->bpp);
354 /* loco lags by 1 row so that it doesn't interfere with top prediction */
355
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 125407 if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
356 ✗ if (s->bit_depth == 16) {
357 ✗ deloco_rgb16((uint16_t *)(ptr - dst_stride), s->row_size / 2,
358 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
359 } else {
360 ✗ deloco_rgb8(ptr - dst_stride, s->row_size,
361 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
362 }
363 }
364 125407 s->y++;
365
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 125407 if (s->y == s->cur_h) {
366 658 s->pic_state |= PNG_ALLIMAGE;
367
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 658 if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
368 ✗ if (s->bit_depth == 16) {
369 ✗ deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
370 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
371 } else {
372 ✗ deloco_rgb8(ptr, s->row_size,
373 ✗ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
374 }
375 }
376 }
377 } else {
378 1920 got_line = 0;
379 for (;;) {
380 9080 ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
381
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 9080 if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
382 /* if we already read one row, it is time to stop to
383 * wait for the next one */
384
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 3832 if (got_line)
385 1912 break;
386 1920 ff_png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
387 1920 s->last_row, s->pass_row_size, s->bpp);
388 1920 FFSWAP(uint8_t *, s->last_row, s->tmp_row);
389 1920 FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
390 1920 got_line = 1;
391 }
392
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 7168 if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
393 5632 png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
394 5632 s->color_type, s->last_row);
395 }
396 7168 s->y++;
397
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 7168 if (s->y == s->cur_h) {
398 56 memset(s->last_row, 0, s->row_size);
399 for (;;) {
400
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 56 if (s->pass == NB_PASSES - 1) {
401 8 s->pic_state |= PNG_ALLIMAGE;
402 8 goto the_end;
403 } else {
404 48 s->pass++;
405 48 s->y = 0;
406 48 s->pass_row_size = ff_png_pass_row_size(s->pass,
407 s->bits_per_pixel,
408 s->cur_w);
409 48 s->crow_size = s->pass_row_size + 1;
410
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 48 if (s->pass_row_size != 0)
411 48 break;
412 /* skip pass if empty row */
413 }
414 }
415 }
416 }
417 1920 the_end:;
418 }
419 127327 }
420
421 12453 static int png_decode_idat(PNGDecContext *s, GetByteContext *gb,
422 uint8_t *dst, ptrdiff_t dst_stride)
423 {
424 12453 z_stream *const zstream = &s->zstream.zstream;
425 int ret;
426 12453 zstream->avail_in = bytestream2_get_bytes_left(gb);
427 12453 zstream->next_in = gb->buffer;
428
429 /* decode one line if possible */
430
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 151535 while (zstream->avail_in > 0) {
431 139082 ret = inflate(zstream, Z_PARTIAL_FLUSH);
432
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 139082 if (ret != Z_OK && ret != Z_STREAM_END) {
433 ✗ av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
434 ✗ return AVERROR_EXTERNAL;
435 }
436
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 139082 if (zstream->avail_out == 0) {
437
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 127327 if (!(s->pic_state & PNG_ALLIMAGE)) {
438 127327 png_handle_row(s, dst, dst_stride);
439 }
440 127327 zstream->avail_out = s->crow_size;
441 127327 zstream->next_out = s->crow_buf;
442 }
443
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 139082 if (ret == Z_STREAM_END && zstream->avail_in > 0) {
444 ✗ av_log(s->avctx, AV_LOG_WARNING,
445 "%d undecompressed bytes left in buffer\n", zstream->avail_in);
446 ✗ return 0;
447 }
448 }
449 12453 return 0;
450 }
451
452 6 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
453 const uint8_t *data_end, void *logctx)
454 {
455 FFZStream z;
456 6 z_stream *const zstream = &z.zstream;
457 unsigned char *buf;
458 unsigned buf_size;
459 6 int ret = ff_inflate_init(&z, logctx);
460
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 6 if (ret < 0)
461 ✗ return ret;
462
463 6 zstream->next_in = data;
464 6 zstream->avail_in = data_end - data;
465 6 av_bprint_init(bp, 0, AV_BPRINT_SIZE_UNLIMITED);
466
467
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 18 while (zstream->avail_in > 0) {
468 18 av_bprint_get_buffer(bp, 2, &buf, &buf_size);
469
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 18 if (buf_size < 2) {
470 ✗ ret = AVERROR(ENOMEM);
471 ✗ goto fail;
472 }
473 18 zstream->next_out = buf;
474 18 zstream->avail_out = buf_size - 1;
475 18 ret = inflate(zstream, Z_PARTIAL_FLUSH);
476
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 18 if (ret != Z_OK && ret != Z_STREAM_END) {
477 ✗ ret = AVERROR_EXTERNAL;
478 ✗ goto fail;
479 }
480 18 bp->len += zstream->next_out - buf;
481
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 18 if (ret == Z_STREAM_END)
482 6 break;
483 }
484 6 ff_inflate_end(&z);
485 6 bp->str[bp->len] = 0;
486 6 return 0;
487
488 ✗ fail:
489 ✗ ff_inflate_end(&z);
490 ✗ av_bprint_finalize(bp, NULL);
491 ✗ return ret;
492 }
493
494 276 static char *iso88591_to_utf8(const char *in, size_t size_in)
495 {
496 276 size_t extra = 0, i;
497 char *out, *q;
498
499
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 4821 for (i = 0; i < size_in; i++)
500 4545 extra += !!(in[i] & 0x80);
501
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 276 if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
502 ✗ return NULL;
503 276 q = out = av_malloc(size_in + extra + 1);
504
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 276 if (!out)
505 ✗ return NULL;
506
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 4821 for (i = 0; i < size_in; i++) {
507
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 4545 if (in[i] & 0x80) {
508 ✗ *(q++) = 0xC0 | (in[i] >> 6);
509 ✗ *(q++) = 0x80 | (in[i] & 0x3F);
510 } else {
511 4545 *(q++) = in[i];
512 }
513 }
514 276 *(q++) = 0;
515 276 return out;
516 }
517
518 ✗ static int decode_text_to_exif(PNGDecContext *s, const char *txt_utf8)
519 {
520 ✗ size_t len = strlen(txt_utf8);
521 ✗ const char *ptr = txt_utf8;
522 ✗ const char *end = txt_utf8 + len;
523 ✗ size_t exif_len = 0;
524 uint8_t *exif_ptr;
525 const uint8_t *exif_end;
526
527 // first we find a newline
528 ✗ while (*ptr++ != '\n') {
529 ✗ if (ptr >= end)
530 ✗ return AVERROR_BUFFER_TOO_SMALL;
531 }
532
533 // we check for "exif" and skip over it
534 ✗ if (end - ptr < 4 || strncmp("exif", ptr, 4))
535 ✗ return AVERROR_INVALIDDATA;
536 ✗ ptr += 3;
537
538 // then we find the next printable non-space character
539 ✗ while (!av_isgraph(*++ptr)) {
540 ✗ if (ptr >= end)
541 ✗ return AVERROR_BUFFER_TOO_SMALL;
542 }
543
544 // parse the length
545 ✗ while (av_isdigit(*ptr)) {
546 ✗ size_t nlen = exif_len * 10 + (*ptr - '0');
547 ✗ if (nlen < exif_len) // overflow
548 ✗ return AVERROR_INVALIDDATA;
549 ✗ exif_len = nlen;
550 ✗ if (++ptr >= end)
551 ✗ return AVERROR_BUFFER_TOO_SMALL;
552 }
553
554 // then we find the next printable non-space character
555 ✗ while (!av_isgraph(*ptr)) {
556 ✗ if (++ptr >= end)
557 ✗ return AVERROR_BUFFER_TOO_SMALL;
558 }
559
560 // first condition checks for overflow in 2 * exif_len
561 ✗ if ((exif_len & ~SIZE_MAX) || end - ptr < 2 * exif_len)
562 ✗ return AVERROR_INVALIDDATA;
563 ✗ if (exif_len < 10)
564 ✗ return AVERROR_INVALIDDATA;
565
566 ✗ av_buffer_unref(&s->exif_data);
567 // the buffer starts with "Exif " which we skip over
568 // we don't use AV_EXIF_EXIF00 because that disagrees
569 // with the eXIf chunk format
570 ✗ s->exif_data = av_buffer_alloc(exif_len - 6);
571 ✗ if (!s->exif_data)
572 ✗ return AVERROR(ENOMEM);
573
574 // we subtract one because we call ++ptr later
575 // compiler will optimize out the call
576 ✗ ptr += strlen("Exif ") * 2 - 1;
577
578 ✗ exif_ptr = s->exif_data->data;
579 ✗ exif_end = exif_ptr + s->exif_data->size;
580
581 ✗ while (exif_ptr < exif_end) {
582 ✗ while (++ptr < end) {
583 ✗ if (*ptr >= '0' && *ptr <= '9') {
584 ✗ *exif_ptr = (*ptr - '0') << 4;
585 ✗ break;
586 }
587 ✗ if (*ptr >= 'a' && *ptr <= 'f') {
588 ✗ *exif_ptr = (*ptr - 'a' + 10) << 4;
589 ✗ break;
590 }
591 }
592 ✗ while (++ptr < end) {
593 ✗ if (*ptr >= '0' && *ptr <= '9') {
594 ✗ *exif_ptr += *ptr - '0';
595 ✗ break;
596 }
597 ✗ if (*ptr >= 'a' && *ptr <= 'f') {
598 ✗ *exif_ptr += *ptr - 'a' + 10;
599 ✗ break;
600 }
601 }
602 ✗ if (ptr > end)
603 ✗ return AVERROR_INVALIDDATA;
604 ✗ exif_ptr++;
605 }
606
607 ✗ return 0;
608 }
609
610 138 static int decode_text_chunk(PNGDecContext *s, GetByteContext *gb, int compressed)
611 {
612 int ret, method;
613 138 const uint8_t *data = gb->buffer;
614 138 const uint8_t *data_end = gb->buffer_end;
615 138 const char *keyword = data;
616 138 const char *keyword_end = memchr(keyword, 0, data_end - data);
617 138 char *kw_utf8 = NULL, *txt_utf8 = NULL;
618 const char *text;
619 unsigned text_len;
620 AVBPrint bp;
621
622
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 138 if (!keyword_end)
623 ✗ return AVERROR_INVALIDDATA;
624 138 data = keyword_end + 1;
625
626
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 138 if (compressed) {
627 ✗ if (data == data_end)
628 ✗ return AVERROR_INVALIDDATA;
629 ✗ method = *(data++);
630 ✗ if (method)
631 ✗ return AVERROR_INVALIDDATA;
632 ✗ if ((ret = decode_zbuf(&bp, data, data_end, s->avctx)) < 0)
633 ✗ return ret;
634 ✗ text = bp.str;
635 ✗ text_len = bp.len;
636 } else {
637 138 text = data;
638 138 text_len = data_end - data;
639 }
640
641 138 txt_utf8 = iso88591_to_utf8(text, text_len);
642
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 138 if (compressed)
643 ✗ av_bprint_finalize(&bp, NULL);
644
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 138 if (!txt_utf8)
645 ✗ return AVERROR(ENOMEM);
646 138 kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
647
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 138 if (!kw_utf8) {
648 ✗ av_free(txt_utf8);
649 ✗ return AVERROR(ENOMEM);
650 }
651
652
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 138 if (!strcmp(kw_utf8, "Raw profile type exif")) {
653 ✗ ret = decode_text_to_exif(s, txt_utf8);
654 ✗ if (ret < 0) {;
655 ✗ av_buffer_unref(&s->exif_data);
656 } else {
657 ✗ av_freep(&kw_utf8);
658 ✗ av_freep(&txt_utf8);
659 ✗ return ret;
660 }
661 }
662
663 138 av_dict_set(&s->frame_metadata, kw_utf8, txt_utf8,
664 AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
665 138 return 0;
666 }
667
668 421 static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s,
669 GetByteContext *gb)
670 {
671
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 421 if (bytestream2_get_bytes_left(gb) != 13)
672 ✗ return AVERROR_INVALIDDATA;
673
674
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 421 if (s->pic_state & PNG_IDAT) {
675 ✗ av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
676 ✗ return AVERROR_INVALIDDATA;
677 }
678
679
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 421 if (s->hdr_state & PNG_IHDR) {
680 ✗ av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
681 ✗ return AVERROR_INVALIDDATA;
682 }
683
684 421 s->width = s->cur_w = bytestream2_get_be32(gb);
685 421 s->height = s->cur_h = bytestream2_get_be32(gb);
686
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 421 if (av_image_check_size(s->width, s->height, 0, avctx)) {
687 ✗ s->cur_w = s->cur_h = s->width = s->height = 0;
688 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
689 ✗ return AVERROR_INVALIDDATA;
690 }
691 421 s->bit_depth = bytestream2_get_byte(gb);
692
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 421 if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
693
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 421 s->bit_depth != 8 && s->bit_depth != 16) {
694 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
695 ✗ goto error;
696 }
697 421 s->color_type = bytestream2_get_byte(gb);
698 421 s->compression_type = bytestream2_get_byte(gb);
699
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 421 if (s->compression_type) {
700 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
701 ✗ goto error;
702 }
703 421 s->filter_type = bytestream2_get_byte(gb);
704 421 s->interlace_type = bytestream2_get_byte(gb);
705 421 s->hdr_state |= PNG_IHDR;
706
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 421 if (avctx->debug & FF_DEBUG_PICT_INFO)
707 ✗ av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
708 "compression_type=%d filter_type=%d interlace_type=%d\n",
709 s->width, s->height, s->bit_depth, s->color_type,
710 s->compression_type, s->filter_type, s->interlace_type);
711
712 421 return 0;
713 ✗ error:
714 ✗ s->cur_w = s->cur_h = s->width = s->height = 0;
715 ✗ s->bit_depth = 8;
716 ✗ return AVERROR_INVALIDDATA;
717 }
718
719 388 static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s,
720 GetByteContext *gb)
721 {
722
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 388 if (s->pic_state & PNG_IDAT) {
723 ✗ av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
724 ✗ return AVERROR_INVALIDDATA;
725 }
726 388 avctx->sample_aspect_ratio.num = bytestream2_get_be32(gb);
727 388 avctx->sample_aspect_ratio.den = bytestream2_get_be32(gb);
728
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 388 if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
729 ✗ avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
730 388 bytestream2_skip(gb, 1); /* unit specifier */
731
732 388 return 0;
733 }
734
735 2 static int decode_exif_chunk(AVCodecContext *avctx, PNGDecContext *s,
736 GetByteContext *gb)
737 {
738
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 2 if (!(s->hdr_state & PNG_IHDR)) {
739 ✗ av_log(avctx, AV_LOG_ERROR, "eXIf before IHDR\n");
740 ✗ return AVERROR_INVALIDDATA;
741 }
742
743 2 av_buffer_unref(&s->exif_data);
744 2 s->exif_data = av_buffer_alloc(bytestream2_get_bytes_left(gb));
745
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 2 if (!s->exif_data)
746 ✗ return AVERROR(ENOMEM);
747 2 bytestream2_get_buffer(gb, s->exif_data->data, s->exif_data->size);
748
749 2 return 0;
750 }
751
752 /*
753 * This populates AVCodecContext fields so it must be called before
754 * ff_thread_finish_setup() to avoid a race condition with respect to the
755 * generic copying of avctx fields.
756 */
757 666 static int populate_avctx_color_fields(AVCodecContext *avctx, AVFrame *frame)
758 {
759 666 PNGDecContext *s = avctx->priv_data;
760 int ret;
761
762
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 666 if (s->have_cicp) {
763
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 4 if (s->cicp_primaries >= AVCOL_PRI_NB)
764 ✗ av_log(avctx, AV_LOG_WARNING, "unrecognized cICP primaries\n");
765 else
766 4 avctx->color_primaries = frame->color_primaries = s->cicp_primaries;
767
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 4 if (s->cicp_trc >= AVCOL_TRC_NB)
768 ✗ av_log(avctx, AV_LOG_WARNING, "unrecognized cICP transfer\n");
769 else
770 4 avctx->color_trc = frame->color_trc = s->cicp_trc;
771
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 4 if (s->cicp_range == 0) {
772 ✗ av_log(avctx, AV_LOG_WARNING, "tv-range cICP tag found. Colors may be wrong\n");
773 ✗ avctx->color_range = frame->color_range = AVCOL_RANGE_MPEG;
774
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 4 } else if (s->cicp_range != 1) {
775 /* we already printed a warning when parsing the cICP chunk */
776 ✗ avctx->color_range = frame->color_range = AVCOL_RANGE_UNSPECIFIED;
777 }
778
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 662 } else if (s->iccp_data) {
779 AVFrameSideData *sd;
780 6 ret = ff_frame_new_side_data(avctx, frame, AV_FRAME_DATA_ICC_PROFILE,
781 s->iccp_data_len, &sd);
782
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 6 if (ret < 0)
783 ✗ return ret;
784
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 6 if (sd) {
785 6 memcpy(sd->data, s->iccp_data, s->iccp_data_len);
786 6 av_dict_set(&sd->metadata, "name", s->iccp_name, 0);
787 }
788
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 656 } else if (s->have_srgb) {
789 39 avctx->color_primaries = frame->color_primaries = AVCOL_PRI_BT709;
790 39 avctx->color_trc = frame->color_trc = AVCOL_TRC_IEC61966_2_1;
791
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 617 } else if (s->have_chrm) {
792 AVColorPrimariesDesc desc;
793 enum AVColorPrimaries prim;
794 6 desc.wp.x = av_make_q(s->white_point[0], 100000);
795 6 desc.wp.y = av_make_q(s->white_point[1], 100000);
796 6 desc.prim.r.x = av_make_q(s->display_primaries[0][0], 100000);
797 6 desc.prim.r.y = av_make_q(s->display_primaries[0][1], 100000);
798 6 desc.prim.g.x = av_make_q(s->display_primaries[1][0], 100000);
799 6 desc.prim.g.y = av_make_q(s->display_primaries[1][1], 100000);
800 6 desc.prim.b.x = av_make_q(s->display_primaries[2][0], 100000);
801 6 desc.prim.b.y = av_make_q(s->display_primaries[2][1], 100000);
802 6 prim = av_csp_primaries_id_from_desc(&desc);
803
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 6 if (prim != AVCOL_PRI_UNSPECIFIED)
804 6 avctx->color_primaries = frame->color_primaries = prim;
805 else
806 ✗ av_log(avctx, AV_LOG_WARNING, "unknown cHRM primaries\n");
807 }
808
809 /* these chunks override gAMA */
810
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 666 if (s->iccp_data || s->have_srgb || s->have_cicp) {
811 49 av_dict_set(&s->frame_metadata, "gamma", NULL, 0);
812
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 617 } else if (s->gamma) {
813 /*
814 * These values are 100000/2.2, 100000/2.8, 100000/2.6, and
815 * 100000/1.0 respectively. 45455, 35714, and 38462, and 100000.
816 * There's a 0.001 gamma tolerance here in case of floating
817 * point issues when the PNG was written.
818 *
819 * None of the other enums have a pure gamma curve so it makes
820 * sense to leave those to sRGB and cICP.
821 */
822
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 34 if (s->gamma > 45355 && s->gamma < 45555)
823 26 avctx->color_trc = frame->color_trc = AVCOL_TRC_GAMMA22;
824
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 8 else if (s->gamma > 35614 && s->gamma < 35814)
825 ✗ avctx->color_trc = frame->color_trc = AVCOL_TRC_GAMMA28;
826
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 8 else if (s->gamma > 38362 && s->gamma < 38562)
827 ✗ avctx->color_trc = frame->color_trc = AVCOL_TRC_SMPTE428;
828
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 8 else if (s->gamma > 99900 && s->gamma < 100100)
829 ✗ avctx->color_trc = frame->color_trc = AVCOL_TRC_LINEAR;
830 }
831
832 /* PNG only supports RGB */
833 666 avctx->colorspace = frame->colorspace = AVCOL_SPC_RGB;
834
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 666 if (!s->have_cicp || s->cicp_range == 1)
835 666 avctx->color_range = frame->color_range = AVCOL_RANGE_JPEG;
836
837 /*
838 * tRNS sets alpha depth to full, so we ignore sBIT if set.
839 * As a result we must wait until now to set
840 * avctx->bits_per_raw_sample in case tRNS appears after sBIT
841 */
842
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 666 if (!s->has_trns && s->significant_bits > 0)
843 ✗ avctx->bits_per_raw_sample = s->significant_bits;
844
845
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 666 if (s->have_clli) {
846 AVContentLightMetadata *clli;
847
848 2 ret = ff_decode_content_light_new(avctx, frame, &clli);
849
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 2 if (ret < 0)
850 ✗ return ret;
851
852
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 2 if (clli) {
853 /*
854 * 0.0001 divisor value
855 * see: https://www.w3.org/TR/png-3/#cLLI-chunk
856 */
857 2 clli->MaxCLL = s->clli_max / 10000;
858 2 clli->MaxFALL = s->clli_avg / 10000;
859 }
860 }
861
862
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 666 if (s->have_mdcv) {
863 AVMasteringDisplayMetadata *mdcv;
864
865 2 ret = ff_decode_mastering_display_new(avctx, frame, &mdcv);
866
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 2 if (ret < 0)
867 ✗ return ret;
868
869
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 2 if (mdcv) {
870 2 mdcv->has_primaries = 1;
871
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 8 for (int i = 0; i < 3; i++) {
872 6 mdcv->display_primaries[i][0] = av_make_q(s->mdcv_primaries[i][0], 50000);
873 6 mdcv->display_primaries[i][1] = av_make_q(s->mdcv_primaries[i][1], 50000);
874 }
875 2 mdcv->white_point[0] = av_make_q(s->mdcv_white_point[0], 50000);
876 2 mdcv->white_point[1] = av_make_q(s->mdcv_white_point[1], 50000);
877 2 mdcv->has_luminance = 1;
878 2 mdcv->max_luminance = av_make_q(s->mdcv_max_lum, 10000);
879 2 mdcv->min_luminance = av_make_q(s->mdcv_min_lum, 10000);
880 }
881 }
882
883 666 return 0;
884 }
885
886 12453 static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
887 GetByteContext *gb, AVFrame *p)
888 {
889 int ret;
890
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 12453 size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
891
892
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 12453 if (!p)
893 ✗ return AVERROR_INVALIDDATA;
894
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 12453 if (!(s->hdr_state & PNG_IHDR)) {
895 ✗ av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
896 ✗ return AVERROR_INVALIDDATA;
897 }
898
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 12453 if (!(s->pic_state & PNG_IDAT)) {
899 /* init image info */
900 666 ret = ff_set_dimensions(avctx, s->width, s->height);
901
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 666 if (ret < 0)
902 ✗ return ret;
903
904 666 s->channels = ff_png_get_nb_channels(s->color_type);
905 666 s->bits_per_pixel = s->bit_depth * s->channels;
906 666 s->bpp = (s->bits_per_pixel + 7) >> 3;
907 666 s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
908
909
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 666 if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
910
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 626 s->color_type == PNG_COLOR_TYPE_RGB) {
911 481 avctx->pix_fmt = AV_PIX_FMT_RGB24;
912
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 185 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
913
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 145 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
914 97 avctx->pix_fmt = AV_PIX_FMT_RGBA;
915
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 88 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
916
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 48 s->color_type == PNG_COLOR_TYPE_GRAY) {
917 4 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
918
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 84 } else if (s->bit_depth == 16 &&
919
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 40 s->color_type == PNG_COLOR_TYPE_GRAY) {
920 16 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
921
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 68 } else if (s->bit_depth == 16 &&
922
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 24 s->color_type == PNG_COLOR_TYPE_RGB) {
923 18 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
924
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 50 } else if (s->bit_depth == 16 &&
925
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 6 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
926 4 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
927
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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) &&
928
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 42 s->color_type == PNG_COLOR_TYPE_PALETTE) {
929
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 42 avctx->pix_fmt = avctx->codec_id == AV_CODEC_ID_APNG ? AV_PIX_FMT_RGBA : AV_PIX_FMT_PAL8;
930
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 4 } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
931 ✗ avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
932
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 4 } else if (s->bit_depth == 8 &&
933
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 2 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
934 2 avctx->pix_fmt = AV_PIX_FMT_YA8;
935
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 2 } else if (s->bit_depth == 16 &&
936
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 2 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
937 2 avctx->pix_fmt = AV_PIX_FMT_YA16BE;
938 } else {
939 ✗ avpriv_report_missing_feature(avctx,
940 "Bit depth %d color type %d",
941 s->bit_depth, s->color_type);
942 ✗ return AVERROR_PATCHWELCOME;
943 }
944
945
4/4
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 666 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
946
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 137 switch (avctx->pix_fmt) {
947 137 case AV_PIX_FMT_RGB24:
948 137 avctx->pix_fmt = AV_PIX_FMT_RGBA;
949 137 break;
950
951 ✗ case AV_PIX_FMT_RGB48BE:
952 ✗ avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
953 ✗ break;
954
955 ✗ case AV_PIX_FMT_GRAY8:
956 ✗ avctx->pix_fmt = AV_PIX_FMT_YA8;
957 ✗ break;
958
959 ✗ case AV_PIX_FMT_GRAY16BE:
960 ✗ avctx->pix_fmt = AV_PIX_FMT_YA16BE;
961 ✗ break;
962
963 ✗ default:
964 ✗ avpriv_request_sample(avctx, "bit depth %d "
965 "and color type %d with TRNS",
966 s->bit_depth, s->color_type);
967 ✗ return AVERROR_INVALIDDATA;
968 }
969
970 137 s->bpp += byte_depth;
971 }
972
973 /* PNG spec mandates independent alpha channel */
974
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 666 if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
975
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 565 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
976 105 avctx->alpha_mode = AVALPHA_MODE_STRAIGHT;
977
978 666 ff_progress_frame_unref(&s->picture);
979
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 666 if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
980 /* We only need a buffer for the current picture. */
981 1 ret = ff_thread_get_buffer(avctx, p, 0);
982
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 1 if (ret < 0)
983 ✗ return ret;
984
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 665 } else if (s->dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
985 /* We need a buffer for the current picture as well as
986 * a buffer for the reference to retain. */
987 12 ret = ff_progress_frame_get_buffer(avctx, &s->picture,
988 AV_GET_BUFFER_FLAG_REF);
989
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 12 if (ret < 0)
990 ✗ return ret;
991 12 ret = ff_thread_get_buffer(avctx, p, 0);
992
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 12 if (ret < 0)
993 ✗ return ret;
994 } else {
995 /* The picture output this time and the reference to retain coincide. */
996 653 ret = ff_progress_frame_get_buffer(avctx, &s->picture,
997 AV_GET_BUFFER_FLAG_REF);
998
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 653 if (ret < 0)
999 ✗ return ret;
1000 653 ret = av_frame_ref(p, s->picture.f);
1001
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 653 if (ret < 0)
1002 ✗ return ret;
1003 }
1004
1005 666 p->pict_type = AV_PICTURE_TYPE_I;
1006 666 p->flags |= AV_FRAME_FLAG_KEY;
1007
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 666 p->flags |= AV_FRAME_FLAG_INTERLACED * !!s->interlace_type;
1008
1009
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 666 if ((ret = populate_avctx_color_fields(avctx, p)) < 0)
1010 ✗ return ret;
1011 666 ff_thread_finish_setup(avctx);
1012
1013 /* compute the compressed row size */
1014
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 666 if (!s->interlace_type) {
1015 658 s->crow_size = s->row_size + 1;
1016 } else {
1017 8 s->pass = 0;
1018 8 s->pass_row_size = ff_png_pass_row_size(s->pass,
1019 s->bits_per_pixel,
1020 s->cur_w);
1021 8 s->crow_size = s->pass_row_size + 1;
1022 }
1023 ff_dlog(avctx, "row_size=%d crow_size =%d\n",
1024 s->row_size, s->crow_size);
1025
1026 /* copy the palette if needed */
1027
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 666 if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
1028 ✗ memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
1029 /* empty row is used if differencing to the first row */
1030 666 av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size);
1031
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 666 if (!s->last_row)
1032 ✗ return AVERROR_INVALIDDATA;
1033
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 666 if (s->interlace_type ||
1034
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 658 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
1035 109 av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size);
1036
1/2
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✓ Branch 1 taken 109 times.
 109 if (!s->tmp_row)
1037 ✗ return AVERROR_INVALIDDATA;
1038 }
1039 /* compressed row */
1040 666 av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
1041
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 666 if (!s->buffer)
1042 ✗ return AVERROR(ENOMEM);
1043
1044 /* we want crow_buf+1 to be 16-byte aligned */
1045 666 s->crow_buf = s->buffer + 15;
1046 666 s->zstream.zstream.avail_out = s->crow_size;
1047 666 s->zstream.zstream.next_out = s->crow_buf;
1048 }
1049
1050 12453 s->pic_state |= PNG_IDAT;
1051
1052 /* set image to non-transparent bpp while decompressing */
1053
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✓ Branch 3 taken 42 times.
 12453 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
1054 147 s->bpp -= byte_depth;
1055
1056 12453 ret = png_decode_idat(s, gb, p->data[0], p->linesize[0]);
1057
1058
4/4
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 12453 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
1059 147 s->bpp += byte_depth;
1060
1061
1/2
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 12453 if (ret < 0)
1062 ✗ return ret;
1063
1064 12453 return 0;
1065 }
1066
1067 3 static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s,
1068 GetByteContext *gb)
1069 {
1070 3 int length = bytestream2_get_bytes_left(gb);
1071 int n, i, r, g, b;
1072
1073
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 3 if ((length % 3) != 0 || length > 256 * 3)
1074 ✗ return AVERROR_INVALIDDATA;
1075 /* read the palette */
1076 3 n = length / 3;
1077
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 711 for (i = 0; i < n; i++) {
1078 708 r = bytestream2_get_byte(gb);
1079 708 g = bytestream2_get_byte(gb);
1080 708 b = bytestream2_get_byte(gb);
1081 708 s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
1082 }
1083
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 63 for (; i < 256; i++)
1084 60 s->palette[i] = (0xFFU << 24);
1085 3 s->hdr_state |= PNG_PLTE;
1086
1087 3 return 0;
1088 }
1089
1090 7 static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s,
1091 GetByteContext *gb)
1092 {
1093 7 int length = bytestream2_get_bytes_left(gb);
1094 int v, i;
1095
1096
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 7 if (!(s->hdr_state & PNG_IHDR)) {
1097 ✗ av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
1098 ✗ return AVERROR_INVALIDDATA;
1099 }
1100
1101
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 7 if (s->pic_state & PNG_IDAT) {
1102 ✗ av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
1103 ✗ return AVERROR_INVALIDDATA;
1104 }
1105
1106
2/2
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 7 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1107
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 3 if (length > 256 || !(s->hdr_state & PNG_PLTE))
1108 ✗ return AVERROR_INVALIDDATA;
1109
1110
2/2
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 54 for (i = 0; i < length; i++) {
1111 51 unsigned v = bytestream2_get_byte(gb);
1112 51 s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
1113 }
1114
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 4 } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
1115
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 4 if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
1116
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 4 (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
1117
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 4 s->bit_depth == 1)
1118 ✗ return AVERROR_INVALIDDATA;
1119
1120
2/2
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 16 for (i = 0; i < length / 2; i++) {
1121 /* only use the least significant bits */
1122 12 v = av_zero_extend(bytestream2_get_be16(gb), s->bit_depth);
1123
1124
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 12 if (s->bit_depth > 8)
1125 ✗ AV_WB16(&s->transparent_color_be[2 * i], v);
1126 else
1127 12 s->transparent_color_be[i] = v;
1128 }
1129 } else {
1130 ✗ return AVERROR_INVALIDDATA;
1131 }
1132
1133 7 s->has_trns = 1;
1134
1135 7 return 0;
1136 }
1137
1138 6 static int decode_iccp_chunk(PNGDecContext *s, GetByteContext *gb)
1139 {
1140 6 int ret, cnt = 0;
1141 AVBPrint bp;
1142
1143
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 132 while ((s->iccp_name[cnt++] = bytestream2_get_byte(gb)) && cnt < 81);
1144
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 6 if (cnt > 80) {
1145 ✗ av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
1146 ✗ ret = AVERROR_INVALIDDATA;
1147 ✗ goto fail;
1148 }
1149
1150
1/2
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✓ Branch 2 taken 6 times.
 6 if (bytestream2_get_byte(gb) != 0) {
1151 ✗ av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
1152 ✗ ret = AVERROR_INVALIDDATA;
1153 ✗ goto fail;
1154 }
1155
1156
1/2
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✓ Branch 2 taken 6 times.
 6 if ((ret = decode_zbuf(&bp, gb->buffer, gb->buffer_end, s->avctx)) < 0)
1157 ✗ return ret;
1158
1159 6 av_freep(&s->iccp_data);
1160 6 ret = av_bprint_finalize(&bp, (char **)&s->iccp_data);
1161
1/2
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 6 if (ret < 0)
1162 ✗ return ret;
1163 6 s->iccp_data_len = bp.len;
1164
1165 6 return 0;
1166 ✗ fail:
1167 ✗ s->iccp_name[0] = 0;
1168 ✗ return ret;
1169 }
1170
1171 ✗ static int decode_sbit_chunk(AVCodecContext *avctx, PNGDecContext *s,
1172 GetByteContext *gb)
1173 {
1174 ✗ int bits = 0;
1175 int channels;
1176 ✗ int remainder = bytestream2_get_bytes_left(gb);
1177
1178 ✗ if (!(s->hdr_state & PNG_IHDR)) {
1179 ✗ av_log(avctx, AV_LOG_ERROR, "sBIT before IHDR\n");
1180 ✗ return AVERROR_INVALIDDATA;
1181 }
1182
1183 ✗ if (s->pic_state & PNG_IDAT) {
1184 ✗ av_log(avctx, AV_LOG_WARNING, "Ignoring illegal sBIT chunk after IDAT\n");
1185 ✗ return 0;
1186 }
1187
1188 ✗ channels = s->color_type & PNG_COLOR_MASK_PALETTE ? 3 : ff_png_get_nb_channels(s->color_type);
1189
1190 ✗ if (remainder != channels) {
1191 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid sBIT size: %d, expected: %d\n", remainder, channels);
1192 /* not enough space left in chunk to read info */
1193 ✗ if (remainder < channels)
1194 ✗ return 0;
1195 }
1196
1197 ✗ for (int i = 0; i < channels; i++) {
1198 ✗ int b = bytestream2_get_byteu(gb);
1199 ✗ bits = FFMAX(b, bits);
1200 }
1201
1202 ✗ if (bits <= 0 || bits > (s->color_type & PNG_COLOR_MASK_PALETTE ? 8 : s->bit_depth)) {
1203 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid significant bits: %d\n", bits);
1204 ✗ return 0;
1205 }
1206 ✗ s->significant_bits = bits;
1207
1208 ✗ return 0;
1209 }
1210
1211 ✗ static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
1212 {
1213 ✗ if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
1214 int i, j, k;
1215 ✗ uint8_t *pd = p->data[0];
1216 ✗ for (j = 0; j < s->height; j++) {
1217 ✗ i = s->width / 8;
1218 ✗ for (k = 7; k >= 1; k--)
1219 ✗ if ((s->width&7) >= k)
1220 ✗ pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
1221 ✗ for (i--; i >= 0; i--) {
1222 ✗ pd[8*i + 7]= pd[i] & 1;
1223 ✗ pd[8*i + 6]= (pd[i]>>1) & 1;
1224 ✗ pd[8*i + 5]= (pd[i]>>2) & 1;
1225 ✗ pd[8*i + 4]= (pd[i]>>3) & 1;
1226 ✗ pd[8*i + 3]= (pd[i]>>4) & 1;
1227 ✗ pd[8*i + 2]= (pd[i]>>5) & 1;
1228 ✗ pd[8*i + 1]= (pd[i]>>6) & 1;
1229 ✗ pd[8*i + 0]= pd[i]>>7;
1230 }
1231 ✗ pd += p->linesize[0];
1232 }
1233 ✗ } else if (s->bits_per_pixel == 2) {
1234 int i, j;
1235 ✗ uint8_t *pd = p->data[0];
1236 ✗ for (j = 0; j < s->height; j++) {
1237 ✗ i = s->width / 4;
1238 ✗ if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1239 ✗ if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
1240 ✗ if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
1241 ✗ if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
1242 ✗ for (i--; i >= 0; i--) {
1243 ✗ pd[4*i + 3]= pd[i] & 3;
1244 ✗ pd[4*i + 2]= (pd[i]>>2) & 3;
1245 ✗ pd[4*i + 1]= (pd[i]>>4) & 3;
1246 ✗ pd[4*i + 0]= pd[i]>>6;
1247 }
1248 } else {
1249 ✗ if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
1250 ✗ if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
1251 ✗ if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
1252 ✗ for (i--; i >= 0; i--) {
1253 ✗ pd[4*i + 3]= ( pd[i] & 3)*0x55;
1254 ✗ pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
1255 ✗ pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
1256 ✗ pd[4*i + 0]= ( pd[i]>>6 )*0x55;
1257 }
1258 }
1259 ✗ pd += p->linesize[0];
1260 }
1261 ✗ } else if (s->bits_per_pixel == 4) {
1262 int i, j;
1263 ✗ uint8_t *pd = p->data[0];
1264 ✗ for (j = 0; j < s->height; j++) {
1265 ✗ i = s->width/2;
1266 ✗ if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
1267 ✗ if (s->width&1) pd[2*i+0]= pd[i]>>4;
1268 ✗ for (i--; i >= 0; i--) {
1269 ✗ pd[2*i + 1] = pd[i] & 15;
1270 ✗ pd[2*i + 0] = pd[i] >> 4;
1271 }
1272 } else {
1273 ✗ if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
1274 ✗ for (i--; i >= 0; i--) {
1275 ✗ pd[2*i + 1] = (pd[i] & 15) * 0x11;
1276 ✗ pd[2*i + 0] = (pd[i] >> 4) * 0x11;
1277 }
1278 }
1279 ✗ pd += p->linesize[0];
1280 }
1281 }
1282 ✗ }
1283
1284 262 static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
1285 GetByteContext *gb)
1286 {
1287 uint32_t sequence_number;
1288 int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
1289
1290
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 262 if (bytestream2_get_bytes_left(gb) != APNG_FCTL_CHUNK_SIZE)
1291 ✗ return AVERROR_INVALIDDATA;
1292
1293
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 262 if (!(s->hdr_state & PNG_IHDR)) {
1294 ✗ av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
1295 ✗ return AVERROR_INVALIDDATA;
1296 }
1297
1298
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 262 if (s->pic_state & PNG_IDAT) {
1299 ✗ av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
1300 ✗ return AVERROR_INVALIDDATA;
1301 }
1302
1303 262 sequence_number = bytestream2_get_be32(gb);
1304 262 cur_w = bytestream2_get_be32(gb);
1305 262 cur_h = bytestream2_get_be32(gb);
1306 262 x_offset = bytestream2_get_be32(gb);
1307 262 y_offset = bytestream2_get_be32(gb);
1308 262 bytestream2_skip(gb, 4); /* delay_num (2), delay_den (2) */
1309 262 dispose_op = bytestream2_get_byte(gb);
1310 262 blend_op = bytestream2_get_byte(gb);
1311
1312
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 262 if (sequence_number == 0 &&
1313
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 16 (cur_w != s->width ||
1314
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 16 cur_h != s->height ||
1315
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 16 x_offset != 0 ||
1316
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 262 y_offset != 0) ||
1317
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 262 cur_w <= 0 || cur_h <= 0 ||
1318
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 262 x_offset < 0 || y_offset < 0 ||
1319
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 262 cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1320 ✗ return AVERROR_INVALIDDATA;
1321
1322
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 262 if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1323 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1324 ✗ return AVERROR_INVALIDDATA;
1325 }
1326
1327
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 262 if ((sequence_number == 0 || !s->last_picture.f) &&
1328 dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1329 // No previous frame to revert to for the first frame
1330 // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1331 ✗ dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1332 }
1333
1334
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 262 if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1335
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 4 avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1336
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 4 avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1337
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 4 avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1338
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 4 avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1339
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 4 avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1340 )) {
1341 // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1342 ✗ blend_op = APNG_BLEND_OP_SOURCE;
1343 }
1344
1345 262 s->cur_w = cur_w;
1346 262 s->cur_h = cur_h;
1347 262 s->x_offset = x_offset;
1348 262 s->y_offset = y_offset;
1349 262 s->dispose_op = dispose_op;
1350 262 s->blend_op = blend_op;
1351
1352 262 return 0;
1353 }
1354
1355 ✗ static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
1356 {
1357 int i, j;
1358 ✗ uint8_t *pd = p->data[0];
1359 ✗ uint8_t *pd_last = s->last_picture.f->data[0];
1360 ✗ int ls = av_image_get_linesize(p->format, s->width, 0);
1361
1362 ✗ ls = FFMIN(ls, s->width * s->bpp);
1363
1364 ✗ ff_progress_frame_await(&s->last_picture, INT_MAX);
1365 ✗ for (j = 0; j < s->height; j++) {
1366 ✗ for (i = 0; i < ls; i++)
1367 ✗ pd[i] += pd_last[i];
1368 ✗ pd += p->linesize[0];
1369 ✗ pd_last += s->last_picture.f->linesize[0];
1370 }
1371 ✗ }
1372
1373 // divide by 255 and round to nearest
1374 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1375 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1376
1377 61 static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s,
1378 AVFrame *p)
1379 {
1380 61 uint8_t *dst = p->data[0];
1381 61 ptrdiff_t dst_stride = p->linesize[0];
1382 61 const uint8_t *src = s->last_picture.f->data[0];
1383 61 ptrdiff_t src_stride = s->last_picture.f->linesize[0];
1384
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 61 const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1385
1386 size_t x, y;
1387
1388
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 61 if (s->blend_op == APNG_BLEND_OP_OVER &&
1389
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 41 avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1390 ✗ avctx->pix_fmt != AV_PIX_FMT_GRAY8A) {
1391 ✗ avpriv_request_sample(avctx, "Blending with pixel format %s",
1392 av_get_pix_fmt_name(avctx->pix_fmt));
1393 ✗ return AVERROR_PATCHWELCOME;
1394 }
1395
1396 61 ff_progress_frame_await(&s->last_picture, INT_MAX);
1397
1398 // copy unchanged rectangles from the last frame
1399
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 2247 for (y = 0; y < s->y_offset; y++)
1400 2186 memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1401
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 3381 for (y = s->y_offset; y < s->y_offset + s->cur_h; y++) {
1402 3320 memcpy(dst + y * dst_stride, src + y * src_stride, s->x_offset * bpp);
1403 3320 memcpy(dst + y * dst_stride + (s->x_offset + s->cur_w) * bpp,
1404 3320 src + y * src_stride + (s->x_offset + s->cur_w) * bpp,
1405 3320 (p->width - s->cur_w - s->x_offset) * bpp);
1406 }
1407
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 2561 for (y = s->y_offset + s->cur_h; y < p->height; y++)
1408 2500 memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1409
1410
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 61 if (s->blend_op == APNG_BLEND_OP_OVER) {
1411 // Perform blending
1412
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 1953 for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1413 1912 uint8_t *foreground = dst + dst_stride * y + bpp * s->x_offset;
1414 1912 const uint8_t *background = src + src_stride * y + bpp * s->x_offset;
1415
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 145177 for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += bpp, background += bpp) {
1416 size_t b;
1417 uint8_t foreground_alpha, background_alpha, output_alpha;
1418 uint8_t output[10];
1419
1420 // Since we might be blending alpha onto alpha, we use the following equations:
1421 // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1422 // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1423
1424
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 143265 switch (avctx->pix_fmt) {
1425 143265 case AV_PIX_FMT_RGBA:
1426 143265 foreground_alpha = foreground[3];
1427 143265 background_alpha = background[3];
1428 143265 break;
1429
1430 ✗ case AV_PIX_FMT_GRAY8A:
1431 ✗ foreground_alpha = foreground[1];
1432 ✗ background_alpha = background[1];
1433 ✗ break;
1434 }
1435
1436
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 143265 if (foreground_alpha == 255)
1437 143265 continue;
1438
1439
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 121583 if (foreground_alpha == 0) {
1440 121583 memcpy(foreground, background, bpp);
1441 121583 continue;
1442 }
1443
1444 ✗ output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1445
1446 ✗ av_assert0(bpp <= 10);
1447
1448 ✗ for (b = 0; b < bpp - 1; ++b) {
1449 ✗ if (output_alpha == 0) {
1450 ✗ output[b] = 0;
1451 ✗ } else if (background_alpha == 255) {
1452 ✗ output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1453 } else {
1454 ✗ output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1455 }
1456 }
1457 ✗ output[b] = output_alpha;
1458 ✗ memcpy(foreground, output, bpp);
1459 }
1460 }
1461 }
1462
1463 61 return 0;
1464 }
1465
1466 12 static void apng_reset_background(PNGDecContext *s, const AVFrame *p)
1467 {
1468 // need to reset a rectangle to black
1469 12 av_unused int ret = av_frame_copy(s->picture.f, p);
1470
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 12 const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1471 12 const ptrdiff_t dst_stride = s->picture.f->linesize[0];
1472 12 uint8_t *dst = s->picture.f->data[0] + s->y_offset * dst_stride + bpp * s->x_offset;
1473
1474 av_assert1(ret >= 0);
1475
1476
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 971 for (size_t y = 0; y < s->cur_h; y++) {
1477 959 memset(dst, 0, bpp * s->cur_w);
1478 959 dst += dst_stride;
1479 }
1480 12 }
1481
1482 683 static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
1483 AVFrame *p, const AVPacket *avpkt)
1484 {
1485 683 const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1486 uint32_t tag, length;
1487 683 int decode_next_dat = 0;
1488 int i, ret;
1489
1490 13992 for (;;) {
1491 GetByteContext gb_chunk;
1492
1493 14675 length = bytestream2_get_bytes_left(&s->gb);
1494
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 14675 if (length <= 0) {
1495
1496
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 357 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1497
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 79 avctx->skip_frame == AVDISCARD_ALL) {
1498 95 return 0;
1499 }
1500
1501
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 278 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1502
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 278 if (!(s->pic_state & PNG_IDAT))
1503 16 return 0;
1504 else
1505 587 goto exit_loop;
1506 }
1507 ✗ av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1508 ✗ if ( s->pic_state & PNG_ALLIMAGE
1509 ✗ && avctx->strict_std_compliance <= FF_COMPLIANCE_NORMAL)
1510 ✗ goto exit_loop;
1511 ✗ ret = AVERROR_INVALIDDATA;
1512 1 goto fail;
1513 }
1514
1515 14318 length = bytestream2_get_be32(&s->gb);
1516
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 14318 if (length > 0x7fffffff || length + 8 > bytestream2_get_bytes_left(&s->gb)) {
1517 1 av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1518 1 ret = AVERROR_INVALIDDATA;
1519 1 goto fail;
1520 }
1521
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 14317 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1522 ✗ uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1523 ✗ uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1524 ✗ if (crc_sig ^ crc_cal) {
1525 ✗ av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1526 ✗ if (avctx->err_recognition & AV_EF_EXPLODE) {
1527 ✗ av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1528 ✗ ret = AVERROR_INVALIDDATA;
1529 ✗ goto fail;
1530 }
1531 ✗ av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1532 ✗ bytestream2_skip(&s->gb, length + 8); /* tag */
1533 143 continue;
1534 }
1535 }
1536 14317 tag = bytestream2_get_le32(&s->gb);
1537
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 14317 if (avctx->debug & FF_DEBUG_STARTCODE)
1538 ✗ av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1539 ✗ av_fourcc2str(tag), length);
1540
1541 14317 bytestream2_init(&gb_chunk, s->gb.buffer, length);
1542 14317 bytestream2_skip(&s->gb, length + 4);
1543
1544
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 14317 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1545
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 11748 avctx->skip_frame == AVDISCARD_ALL) {
1546
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 1525 switch(tag) {
1547 1382 case MKTAG('I', 'H', 'D', 'R'):
1548 case MKTAG('p', 'H', 'Y', 's'):
1549 case MKTAG('t', 'E', 'X', 't'):
1550 case MKTAG('I', 'D', 'A', 'T'):
1551 case MKTAG('t', 'R', 'N', 'S'):
1552 case MKTAG('s', 'R', 'G', 'B'):
1553 case MKTAG('c', 'I', 'C', 'P'):
1554 case MKTAG('c', 'H', 'R', 'M'):
1555 case MKTAG('g', 'A', 'M', 'A'):
1556 1382 break;
1557 143 default:
1558 143 continue;
1559 }
1560 }
1561
1562
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 14174 switch (tag) {
1563 421 case MKTAG('I', 'H', 'D', 'R'):
1564
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 421 if ((ret = decode_ihdr_chunk(avctx, s, &gb_chunk)) < 0)
1565 ✗ goto fail;
1566 421 break;
1567 388 case MKTAG('p', 'H', 'Y', 's'):
1568
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 388 if ((ret = decode_phys_chunk(avctx, s, &gb_chunk)) < 0)
1569 ✗ goto fail;
1570 388 break;
1571 262 case MKTAG('f', 'c', 'T', 'L'):
1572
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 262 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1573 ✗ continue;
1574
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 262 if ((ret = decode_fctl_chunk(avctx, s, &gb_chunk)) < 0)
1575 ✗ goto fail;
1576 262 decode_next_dat = 1;
1577 262 break;
1578 2054 case MKTAG('f', 'd', 'A', 'T'):
1579
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 2054 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1580 ✗ continue;
1581
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 2054 if (!decode_next_dat || bytestream2_get_bytes_left(&gb_chunk) < 4) {
1582 ✗ ret = AVERROR_INVALIDDATA;
1583 ✗ goto fail;
1584 }
1585 2054 bytestream2_get_be32(&gb_chunk);
1586 /* fallthrough */
1587 12453 case MKTAG('I', 'D', 'A', 'T'):
1588
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 12453 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1589 ✗ continue;
1590
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 12453 if ((ret = decode_idat_chunk(avctx, s, &gb_chunk, p)) < 0)
1591 ✗ goto fail;
1592 12453 break;
1593 3 case MKTAG('P', 'L', 'T', 'E'):
1594 3 decode_plte_chunk(avctx, s, &gb_chunk);
1595 3 break;
1596 7 case MKTAG('t', 'R', 'N', 'S'):
1597 7 decode_trns_chunk(avctx, s, &gb_chunk);
1598 7 break;
1599 138 case MKTAG('t', 'E', 'X', 't'):
1600
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 138 if (decode_text_chunk(s, &gb_chunk, 0) < 0)
1601 ✗ av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1602 138 break;
1603 ✗ case MKTAG('z', 'T', 'X', 't'):
1604 ✗ if (decode_text_chunk(s, &gb_chunk, 1) < 0)
1605 ✗ av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1606 ✗ break;
1607 ✗ case MKTAG('s', 'T', 'E', 'R'): {
1608 ✗ int mode = bytestream2_get_byte(&gb_chunk);
1609
1610 ✗ if (mode == 0 || mode == 1) {
1611 ✗ s->stereo_mode = mode;
1612 } else {
1613 ✗ av_log(avctx, AV_LOG_WARNING,
1614 "Unknown value in sTER chunk (%d)\n", mode);
1615 }
1616 ✗ break;
1617 }
1618 4 case MKTAG('c', 'I', 'C', 'P'):
1619 4 s->cicp_primaries = bytestream2_get_byte(&gb_chunk);
1620 4 s->cicp_trc = bytestream2_get_byte(&gb_chunk);
1621
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 4 if (bytestream2_get_byte(&gb_chunk) != 0)
1622 ✗ av_log(avctx, AV_LOG_WARNING, "nonzero cICP matrix\n");
1623 4 s->cicp_range = bytestream2_get_byte(&gb_chunk);
1624
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 4 if (s->cicp_range != 0 && s->cicp_range != 1)
1625 ✗ av_log(avctx, AV_LOG_WARNING, "invalid cICP range: %d\n", s->cicp_range);
1626 4 s->have_cicp = 1;
1627 4 break;
1628 39 case MKTAG('s', 'R', 'G', 'B'):
1629 /* skip rendering intent byte */
1630 39 bytestream2_skip(&gb_chunk, 1);
1631 39 s->have_srgb = 1;
1632 39 break;
1633 6 case MKTAG('i', 'C', 'C', 'P'): {
1634
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✓ Branch 2 taken 6 times.
 6 if ((ret = decode_iccp_chunk(s, &gb_chunk)) < 0)
1635 ✗ goto fail;
1636 6 break;
1637 }
1638 16 case MKTAG('c', 'H', 'R', 'M'): {
1639 16 s->have_chrm = 1;
1640
1641 16 s->white_point[0] = bytestream2_get_be32(&gb_chunk);
1642 16 s->white_point[1] = bytestream2_get_be32(&gb_chunk);
1643
1644 /* RGB Primaries */
1645
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 64 for (i = 0; i < 3; i++) {
1646 48 s->display_primaries[i][0] = bytestream2_get_be32(&gb_chunk);
1647 48 s->display_primaries[i][1] = bytestream2_get_be32(&gb_chunk);
1648 }
1649
1650 16 break;
1651 }
1652 ✗ case MKTAG('s', 'B', 'I', 'T'):
1653 ✗ if ((ret = decode_sbit_chunk(avctx, s, &gb_chunk)) < 0)
1654 ✗ goto fail;
1655 ✗ break;
1656 34 case MKTAG('g', 'A', 'M', 'A'): {
1657 AVBPrint bp;
1658 char *gamma_str;
1659 34 s->gamma = bytestream2_get_be32(&gb_chunk);
1660
1661 34 av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
1662 34 av_bprintf(&bp, "%i/%i", s->gamma, 100000);
1663 34 ret = av_bprint_finalize(&bp, &gamma_str);
1664
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 34 if (ret < 0)
1665 ✗ return ret;
1666
1667 34 av_dict_set(&s->frame_metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1668
1669 34 break;
1670 }
1671 2 case MKTAG('c', 'L', 'L', 'i'): /* legacy spelling, for backwards compat */
1672 case MKTAG('c', 'L', 'L', 'I'):
1673
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 2 if (bytestream2_get_bytes_left(&gb_chunk) != 8) {
1674 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid cLLI chunk size: %d\n", bytestream2_get_bytes_left(&gb_chunk));
1675 ✗ break;
1676 }
1677 2 s->have_clli = 1;
1678 2 s->clli_max = bytestream2_get_be32u(&gb_chunk);
1679 2 s->clli_avg = bytestream2_get_be32u(&gb_chunk);
1680 2 break;
1681 2 case MKTAG('m', 'D', 'C', 'v'): /* legacy spelling, for backward compat */
1682 case MKTAG('m', 'D', 'C', 'V'):
1683
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 2 if (bytestream2_get_bytes_left(&gb_chunk) != 24) {
1684 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid mDCV chunk size: %d\n", bytestream2_get_bytes_left(&gb_chunk));
1685 ✗ break;
1686 }
1687 2 s->have_mdcv = 1;
1688
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 8 for (int i = 0; i < 3; i++) {
1689 6 s->mdcv_primaries[i][0] = bytestream2_get_be16u(&gb_chunk);
1690 6 s->mdcv_primaries[i][1] = bytestream2_get_be16u(&gb_chunk);
1691 }
1692 2 s->mdcv_white_point[0] = bytestream2_get_be16u(&gb_chunk);
1693 2 s->mdcv_white_point[1] = bytestream2_get_be16u(&gb_chunk);
1694 2 s->mdcv_max_lum = bytestream2_get_be32u(&gb_chunk);
1695 2 s->mdcv_min_lum = bytestream2_get_be32u(&gb_chunk);
1696 2 break;
1697 2 case MKTAG('e', 'X', 'I', 'f'):
1698 2 ret = decode_exif_chunk(avctx, s, &gb_chunk);
1699
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 2 if (ret < 0)
1700 ✗ goto fail;
1701 2 break;
1702 325 case MKTAG('I', 'E', 'N', 'D'):
1703
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 325 if (!(s->pic_state & PNG_ALLIMAGE))
1704 ✗ av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1705
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 325 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1706 ✗ ret = AVERROR_INVALIDDATA;
1707 ✗ goto fail;
1708 }
1709 325 goto exit_loop;
1710 }
1711 }
1712 587 exit_loop:
1713
1714
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 587 if (!p)
1715 ✗ return AVERROR_INVALIDDATA;
1716
1717
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 587 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1718
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 325 avctx->skip_frame == AVDISCARD_ALL) {
1719 ✗ return 0;
1720 }
1721
1722
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 587 if (percent_missing(s) > avctx->discard_damaged_percentage) {
1723 ✗ ret = AVERROR_INVALIDDATA;
1724 ✗ goto fail;
1725 }
1726
1727
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 587 if (s->bits_per_pixel <= 4)
1728 ✗ handle_small_bpp(s, p);
1729
1730
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 587 if (s->exif_data) {
1731 // we swap because ff_decode_exif_attach_buffer adds to p->metadata
1732 2 FFSWAP(AVDictionary *, p->metadata, s->frame_metadata);
1733 2 ret = ff_decode_exif_attach_buffer(avctx, p, &s->exif_data, AV_EXIF_TIFF_HEADER);
1734 2 FFSWAP(AVDictionary *, p->metadata, s->frame_metadata);
1735
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 2 if (ret < 0) {
1736 ✗ av_log(avctx, AV_LOG_WARNING, "unable to attach EXIF buffer\n");
1737 ✗ return ret;
1738 }
1739 }
1740
1741
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 587 if (s->color_type == PNG_COLOR_TYPE_PALETTE && avctx->codec_id == AV_CODEC_ID_APNG) {
1742
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 6342 for (int y = 0; y < s->height; y++) {
1743 6300 uint8_t *row = &p->data[0][p->linesize[0] * y];
1744
1745
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 951300 for (int x = s->width - 1; x >= 0; x--) {
1746 945000 const uint8_t idx = row[x];
1747
1748 945000 row[4*x+2] = s->palette[idx] & 0xFF;
1749 945000 row[4*x+1] = (s->palette[idx] >> 8 ) & 0xFF;
1750 945000 row[4*x+0] = (s->palette[idx] >> 16) & 0xFF;
1751 945000 row[4*x+3] = s->palette[idx] >> 24;
1752 }
1753 }
1754 }
1755
1756 /* apply transparency if needed */
1757
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 587 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1758
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 136 size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1759 136 size_t raw_bpp = s->bpp - byte_depth;
1760 ptrdiff_t x, y;
1761
1762
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 136 av_assert0(s->bit_depth > 1);
1763
1764
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 17746 for (y = 0; y < s->height; ++y) {
1765 17610 uint8_t *row = &p->data[0][p->linesize[0] * y];
1766
1767
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 17610 if (s->bpp == 2 && byte_depth == 1) {
1768 ✗ uint8_t *pixel = &row[2 * s->width - 1];
1769 ✗ uint8_t *rowp = &row[1 * s->width - 1];
1770 ✗ int tcolor = s->transparent_color_be[0];
1771 ✗ for (x = s->width; x > 0; --x) {
1772 ✗ *pixel-- = *rowp == tcolor ? 0 : 0xff;
1773 ✗ *pixel-- = *rowp--;
1774 }
1775
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 35220 } else if (s->bpp == 4 && byte_depth == 1) {
1776 17610 uint8_t *pixel = &row[4 * s->width - 1];
1777 17610 uint8_t *rowp = &row[3 * s->width - 1];
1778 17610 int tcolor = AV_RL24(s->transparent_color_be);
1779
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 1595310 for (x = s->width; x > 0; --x) {
1780
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 1577700 *pixel-- = AV_RL24(rowp-2) == tcolor ? 0 : 0xff;
1781 1577700 *pixel-- = *rowp--;
1782 1577700 *pixel-- = *rowp--;
1783 1577700 *pixel-- = *rowp--;
1784 }
1785 } else {
1786 /* since we're updating in-place, we have to go from right to left */
1787 ✗ for (x = s->width; x > 0; --x) {
1788 ✗ uint8_t *pixel = &row[s->bpp * (x - 1)];
1789 ✗ memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1790
1791 ✗ if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1792 ✗ memset(&pixel[raw_bpp], 0, byte_depth);
1793 } else {
1794 ✗ memset(&pixel[raw_bpp], 0xff, byte_depth);
1795 }
1796 }
1797 }
1798 }
1799 }
1800
1801 /* handle P-frames only if a predecessor frame is available */
1802
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 587 if (s->last_picture.f) {
1803
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 506 if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1804
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 61 && s->last_picture.f->width == p->width
1805
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 61 && s->last_picture.f->height== p->height
1806
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 61 && s->last_picture.f->format== p->format
1807 ) {
1808
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 61 if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1809 ✗ handle_p_frame_png(s, p);
1810 61 else if (CONFIG_APNG_DECODER &&
1811
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 122 avctx->codec_id == AV_CODEC_ID_APNG &&
1812 61 (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1813 ✗ goto fail;
1814 }
1815 }
1816
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 587 if (CONFIG_APNG_DECODER && s->dispose_op == APNG_DISPOSE_OP_BACKGROUND)
1817 12 apng_reset_background(s, p);
1818
1819 587 ret = 0;
1820 588 fail:
1821
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 588 if (s->picture.f)
1822 586 ff_progress_frame_report(&s->picture, INT_MAX);
1823
1824 588 return ret;
1825 }
1826
1827 667 static void clear_frame_metadata(PNGDecContext *s)
1828 {
1829 667 av_freep(&s->iccp_data);
1830 667 s->iccp_data_len = 0;
1831 667 s->iccp_name[0] = 0;
1832
1833 667 s->stereo_mode = -1;
1834
1835 667 s->have_chrm = 0;
1836 667 s->have_srgb = 0;
1837 667 s->have_cicp = 0;
1838
1839 667 av_dict_free(&s->frame_metadata);
1840 667 }
1841
1842 587 static int output_frame(PNGDecContext *s, AVFrame *f)
1843 {
1844 int ret;
1845
1846
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 587 if (s->stereo_mode >= 0) {
1847 ✗ AVStereo3D *stereo3d = av_stereo3d_create_side_data(f);
1848 ✗ if (!stereo3d) {
1849 ✗ ret = AVERROR(ENOMEM);
1850 ✗ goto fail;
1851 }
1852
1853 ✗ stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1854 ✗ stereo3d->flags = s->stereo_mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1855 }
1856
1857 587 FFSWAP(AVDictionary*, f->metadata, s->frame_metadata);
1858
1859 587 return 0;
1860 ✗ fail:
1861 ✗ av_frame_unref(f);
1862 ✗ return ret;
1863 }
1864
1865 #if CONFIG_PNG_DECODER
1866 405 static int decode_frame_png(AVCodecContext *avctx, AVFrame *p,
1867 int *got_frame, AVPacket *avpkt)
1868 {
1869 405 PNGDecContext *const s = avctx->priv_data;
1870 405 const uint8_t *buf = avpkt->data;
1871 405 int buf_size = avpkt->size;
1872 int64_t sig;
1873 int ret;
1874
1875 405 clear_frame_metadata(s);
1876
1877 405 bytestream2_init(&s->gb, buf, buf_size);
1878
1879 /* check signature */
1880 405 sig = bytestream2_get_be64(&s->gb);
1881
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 405 if (sig != PNGSIG &&
1882 sig != MNGSIG) {
1883 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1884 ✗ return AVERROR_INVALIDDATA;
1885 }
1886
1887 405 s->y = s->has_trns = 0;
1888 405 s->hdr_state = 0;
1889 405 s->pic_state = 0;
1890
1891 /* Reset z_stream */
1892 405 ret = inflateReset(&s->zstream.zstream);
1893
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 405 if (ret != Z_OK)
1894 ✗ return AVERROR_EXTERNAL;
1895
1896
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 405 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1897 1 goto the_end;
1898
1899
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 404 if (avctx->skip_frame == AVDISCARD_ALL) {
1900 79 *got_frame = 0;
1901 79 ret = bytestream2_tell(&s->gb);
1902 79 goto the_end;
1903 }
1904
1905 325 ret = output_frame(s, p);
1906
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 325 if (ret < 0)
1907 ✗ goto the_end;
1908
1909
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 325 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1910 325 ff_progress_frame_unref(&s->last_picture);
1911 325 FFSWAP(ProgressFrame, s->picture, s->last_picture);
1912 }
1913
1914 325 *got_frame = 1;
1915
1916 325 ret = bytestream2_tell(&s->gb);
1917 405 the_end:
1918 405 s->crow_buf = NULL;
1919 405 return ret;
1920 }
1921 #endif
1922
1923 #if CONFIG_APNG_DECODER
1924 262 static int decode_frame_apng(AVCodecContext *avctx, AVFrame *p,
1925 int *got_frame, AVPacket *avpkt)
1926 {
1927 262 PNGDecContext *const s = avctx->priv_data;
1928 int ret;
1929
1930 262 clear_frame_metadata(s);
1931
1932
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 262 if (!(s->hdr_state & PNG_IHDR)) {
1933
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 16 if (!avctx->extradata_size)
1934 ✗ return AVERROR_INVALIDDATA;
1935
1936
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 16 if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1937 ✗ return AVERROR_EXTERNAL;
1938 16 bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1939
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 16 if ((ret = decode_frame_common(avctx, s, NULL, avpkt)) < 0)
1940 ✗ return ret;
1941 }
1942
1943 /* reset state for a new frame */
1944
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 262 if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1945 ✗ return AVERROR_EXTERNAL;
1946 262 s->y = 0;
1947 262 s->pic_state = 0;
1948 262 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1949
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 262 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1950 ✗ return ret;
1951
1952
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 262 if (!(s->pic_state & PNG_ALLIMAGE))
1953 ✗ av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1954
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 262 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT)))
1955 ✗ return AVERROR_INVALIDDATA;
1956
1957 262 ret = output_frame(s, p);
1958
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 262 if (ret < 0)
1959 ✗ return ret;
1960
1961
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 262 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1962
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 262 if (s->dispose_op != APNG_DISPOSE_OP_PREVIOUS)
1963 261 FFSWAP(ProgressFrame, s->picture, s->last_picture);
1964 262 ff_progress_frame_unref(&s->picture);
1965 }
1966
1967 262 *got_frame = 1;
1968 262 return bytestream2_tell(&s->gb);
1969 }
1970 #endif
1971
1972 #if HAVE_THREADS
1973 ✗ static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1974 {
1975 ✗ PNGDecContext *psrc = src->priv_data;
1976 ✗ PNGDecContext *pdst = dst->priv_data;
1977 const ProgressFrame *src_frame;
1978
1979 ✗ if (dst == src)
1980 ✗ return 0;
1981
1982 ✗ if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1983
1984 ✗ pdst->width = psrc->width;
1985 ✗ pdst->height = psrc->height;
1986 ✗ pdst->bit_depth = psrc->bit_depth;
1987 ✗ pdst->color_type = psrc->color_type;
1988 ✗ pdst->compression_type = psrc->compression_type;
1989 ✗ pdst->interlace_type = psrc->interlace_type;
1990 ✗ pdst->filter_type = psrc->filter_type;
1991 ✗ pdst->has_trns = psrc->has_trns;
1992 ✗ memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1993
1994 ✗ memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1995
1996 ✗ pdst->hdr_state |= psrc->hdr_state;
1997 }
1998
1999 ✗ src_frame = psrc->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
2000 &psrc->last_picture : &psrc->picture;
2001
2002 ✗ ff_progress_frame_replace(&pdst->last_picture, src_frame);
2003
2004 ✗ return 0;
2005 }
2006 #endif
2007
2008 165 static av_cold int png_dec_init(AVCodecContext *avctx)
2009 {
2010 165 PNGDecContext *s = avctx->priv_data;
2011
2012 165 s->avctx = avctx;
2013
2014 165 ff_pngdsp_init(&s->dsp);
2015
2016 165 return ff_inflate_init(&s->zstream, avctx);
2017 }
2018
2019 165 static av_cold int png_dec_end(AVCodecContext *avctx)
2020 {
2021 165 PNGDecContext *s = avctx->priv_data;
2022
2023 165 ff_progress_frame_unref(&s->last_picture);
2024 165 ff_progress_frame_unref(&s->picture);
2025 165 av_freep(&s->buffer);
2026 165 s->buffer_size = 0;
2027 165 av_freep(&s->last_row);
2028 165 s->last_row_size = 0;
2029 165 av_freep(&s->tmp_row);
2030 165 s->tmp_row_size = 0;
2031
2032 165 av_freep(&s->iccp_data);
2033 165 av_buffer_unref(&s->exif_data);
2034 165 av_dict_free(&s->frame_metadata);
2035 165 ff_inflate_end(&s->zstream);
2036
2037 165 return 0;
2038 }
2039
2040 #if CONFIG_APNG_DECODER
2041 const FFCodec ff_apng_decoder = {
2042 .p.name = "apng",
2043 CODEC_LONG_NAME("APNG (Animated Portable Network Graphics) image"),
2044 .p.type = AVMEDIA_TYPE_VIDEO,
2045 .p.id = AV_CODEC_ID_APNG,
2046 .priv_data_size = sizeof(PNGDecContext),
2047 .init = png_dec_init,
2048 .close = png_dec_end,
2049 FF_CODEC_DECODE_CB(decode_frame_apng),
2050 UPDATE_THREAD_CONTEXT(update_thread_context),
2051 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
2052 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
2053 FF_CODEC_CAP_USES_PROGRESSFRAMES |
2054 FF_CODEC_CAP_ICC_PROFILES,
2055 };
2056 #endif
2057
2058 #if CONFIG_PNG_DECODER
2059 const FFCodec ff_png_decoder = {
2060 .p.name = "png",
2061 CODEC_LONG_NAME("PNG (Portable Network Graphics) image"),
2062 .p.type = AVMEDIA_TYPE_VIDEO,
2063 .p.id = AV_CODEC_ID_PNG,
2064 .priv_data_size = sizeof(PNGDecContext),
2065 .init = png_dec_init,
2066 .close = png_dec_end,
2067 FF_CODEC_DECODE_CB(decode_frame_png),
2068 UPDATE_THREAD_CONTEXT(update_thread_context),
2069 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
2070 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
2071 FF_CODEC_CAP_INIT_CLEANUP |
2072 FF_CODEC_CAP_USES_PROGRESSFRAMES |
2073 FF_CODEC_CAP_ICC_PROFILES,
2074 };
2075 #endif
2076