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/imgutils.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/stereo3d.h"
32 #include "libavutil/mastering_display_metadata.h"
33
34 #include "avcodec.h"
35 #include "bytestream.h"
36 #include "codec_internal.h"
37 #include "internal.h"
38 #include "apng.h"
39 #include "png.h"
40 #include "pngdsp.h"
41 #include "thread.h"
42 #include "threadframe.h"
43 #include "zlib_wrapper.h"
44
45 #include <zlib.h>
46
47 enum PNGHeaderState {
48 PNG_IHDR = 1 << 0,
49 PNG_PLTE = 1 << 1,
50 };
51
52 enum PNGImageState {
53 PNG_IDAT = 1 << 0,
54 PNG_ALLIMAGE = 1 << 1,
55 };
56
57 typedef struct PNGDecContext {
58 PNGDSPContext dsp;
59 AVCodecContext *avctx;
60
61 GetByteContext gb;
62 ThreadFrame last_picture;
63 ThreadFrame picture;
64
65 AVDictionary *frame_metadata;
66
67 uint8_t iccp_name[82];
68 uint8_t *iccp_data;
69 size_t iccp_data_len;
70
71 int stereo_mode;
72
73 int have_chrm;
74 uint32_t white_point[2];
75 uint32_t display_primaries[3][2];
76
77 enum PNGHeaderState hdr_state;
78 enum PNGImageState pic_state;
79 int width, height;
80 int cur_w, cur_h;
81 int x_offset, y_offset;
82 uint8_t dispose_op, blend_op;
83 int bit_depth;
84 int color_type;
85 int compression_type;
86 int interlace_type;
87 int filter_type;
88 int channels;
89 int bits_per_pixel;
90 int bpp;
91 int has_trns;
92 uint8_t transparent_color_be[6];
93
94 uint32_t palette[256];
95 uint8_t *crow_buf;
96 uint8_t *last_row;
97 unsigned int last_row_size;
98 uint8_t *tmp_row;
99 unsigned int tmp_row_size;
100 uint8_t *buffer;
101 int buffer_size;
102 int pass;
103 int crow_size; /* compressed row size (include filter type) */
104 int row_size; /* decompressed row size */
105 int pass_row_size; /* decompress row size of the current pass */
106 int y;
107 FFZStream zstream;
108 } PNGDecContext;
109
110 /* Mask to determine which pixels are valid in a pass */
111 static const uint8_t png_pass_mask[NB_PASSES] = {
112 0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
113 };
114
115 /* Mask to determine which y pixels can be written in a pass */
116 static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
117 0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
118 };
119
120 /* Mask to determine which pixels to overwrite while displaying */
121 static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
122 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
123 };
124
125 /* NOTE: we try to construct a good looking image at each pass. width
126 * is the original image width. We also do pixel format conversion at
127 * this stage */
png_put_interlaced_row(uint8_t * dst,int width,int bits_per_pixel,int pass,int color_type,const uint8_t * src)128 static void png_put_interlaced_row(uint8_t *dst, int width,
129 int bits_per_pixel, int pass,
130 int color_type, const uint8_t *src)
131 {
132 int x, mask, dsp_mask, j, src_x, b, bpp;
133 uint8_t *d;
134 const uint8_t *s;
135
136 mask = png_pass_mask[pass];
137 dsp_mask = png_pass_dsp_mask[pass];
138
139 switch (bits_per_pixel) {
140 case 1:
141 src_x = 0;
142 for (x = 0; x < width; x++) {
143 j = (x & 7);
144 if ((dsp_mask << j) & 0x80) {
145 b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
146 dst[x >> 3] &= 0xFF7F>>j;
147 dst[x >> 3] |= b << (7 - j);
148 }
149 if ((mask << j) & 0x80)
150 src_x++;
151 }
152 break;
153 case 2:
154 src_x = 0;
155 for (x = 0; x < width; x++) {
156 int j2 = 2 * (x & 3);
157 j = (x & 7);
158 if ((dsp_mask << j) & 0x80) {
159 b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
160 dst[x >> 2] &= 0xFF3F>>j2;
161 dst[x >> 2] |= b << (6 - j2);
162 }
163 if ((mask << j) & 0x80)
164 src_x++;
165 }
166 break;
167 case 4:
168 src_x = 0;
169 for (x = 0; x < width; x++) {
170 int j2 = 4*(x&1);
171 j = (x & 7);
172 if ((dsp_mask << j) & 0x80) {
173 b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
174 dst[x >> 1] &= 0xFF0F>>j2;
175 dst[x >> 1] |= b << (4 - j2);
176 }
177 if ((mask << j) & 0x80)
178 src_x++;
179 }
180 break;
181 default:
182 bpp = bits_per_pixel >> 3;
183 d = dst;
184 s = src;
185 for (x = 0; x < width; x++) {
186 j = x & 7;
187 if ((dsp_mask << j) & 0x80) {
188 memcpy(d, s, bpp);
189 }
190 d += bpp;
191 if ((mask << j) & 0x80)
192 s += bpp;
193 }
194 break;
195 }
196 }
197
ff_add_png_paeth_prediction(uint8_t * dst,uint8_t * src,uint8_t * top,int w,int bpp)198 void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
199 int w, int bpp)
200 {
201 int i;
202 for (i = 0; i < w; i++) {
203 int a, b, c, p, pa, pb, pc;
204
205 a = dst[i - bpp];
206 b = top[i];
207 c = top[i - bpp];
208
209 p = b - c;
210 pc = a - c;
211
212 pa = abs(p);
213 pb = abs(pc);
214 pc = abs(p + pc);
215
216 if (pa <= pb && pa <= pc)
217 p = a;
218 else if (pb <= pc)
219 p = b;
220 else
221 p = c;
222 dst[i] = p + src[i];
223 }
224 }
225
226 #define UNROLL1(bpp, op) \
227 { \
228 r = dst[0]; \
229 if (bpp >= 2) \
230 g = dst[1]; \
231 if (bpp >= 3) \
232 b = dst[2]; \
233 if (bpp >= 4) \
234 a = dst[3]; \
235 for (; i <= size - bpp; i += bpp) { \
236 dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
237 if (bpp == 1) \
238 continue; \
239 dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
240 if (bpp == 2) \
241 continue; \
242 dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
243 if (bpp == 3) \
244 continue; \
245 dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
246 } \
247 }
248
249 #define UNROLL_FILTER(op) \
250 if (bpp == 1) { \
251 UNROLL1(1, op) \
252 } else if (bpp == 2) { \
253 UNROLL1(2, op) \
254 } else if (bpp == 3) { \
255 UNROLL1(3, op) \
256 } else if (bpp == 4) { \
257 UNROLL1(4, op) \
258 } \
259 for (; i < size; i++) { \
260 dst[i] = op(dst[i - bpp], src[i], last[i]); \
261 }
262
263 /* NOTE: 'dst' can be equal to 'last' */
ff_png_filter_row(PNGDSPContext * dsp,uint8_t * dst,int filter_type,uint8_t * src,uint8_t * last,int size,int bpp)264 void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
265 uint8_t *src, uint8_t *last, int size, int bpp)
266 {
267 int i, p, r, g, b, a;
268
269 switch (filter_type) {
270 case PNG_FILTER_VALUE_NONE:
271 memcpy(dst, src, size);
272 break;
273 case PNG_FILTER_VALUE_SUB:
274 for (i = 0; i < bpp; i++)
275 dst[i] = src[i];
276 if (bpp == 4) {
277 p = *(int *)dst;
278 for (; i < size; i += bpp) {
279 unsigned s = *(int *)(src + i);
280 p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
281 *(int *)(dst + i) = p;
282 }
283 } else {
284 #define OP_SUB(x, s, l) ((x) + (s))
285 UNROLL_FILTER(OP_SUB);
286 }
287 break;
288 case PNG_FILTER_VALUE_UP:
289 dsp->add_bytes_l2(dst, src, last, size);
290 break;
291 case PNG_FILTER_VALUE_AVG:
292 for (i = 0; i < bpp; i++) {
293 p = (last[i] >> 1);
294 dst[i] = p + src[i];
295 }
296 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
297 UNROLL_FILTER(OP_AVG);
298 break;
299 case PNG_FILTER_VALUE_PAETH:
300 for (i = 0; i < bpp; i++) {
301 p = last[i];
302 dst[i] = p + src[i];
303 }
304 if (bpp > 2 && size > 4) {
305 /* would write off the end of the array if we let it process
306 * the last pixel with bpp=3 */
307 int w = (bpp & 3) ? size - 3 : size;
308
309 if (w > i) {
310 dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
311 i = w;
312 }
313 }
314 ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
315 break;
316 }
317 }
318
319 /* This used to be called "deloco" in FFmpeg
320 * and is actually an inverse reversible colorspace transformation */
321 #define YUV2RGB(NAME, TYPE) \
322 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
323 { \
324 int i; \
325 for (i = 0; i < size - 2; i += 3 + alpha) { \
326 int g = dst [i + 1]; \
327 dst[i + 0] += g; \
328 dst[i + 2] += g; \
329 } \
330 }
331
YUV2RGB(rgb8,uint8_t)332 YUV2RGB(rgb8, uint8_t)
333 YUV2RGB(rgb16, uint16_t)
334
335 static int percent_missing(PNGDecContext *s)
336 {
337 if (s->interlace_type) {
338 return 100 - 100 * s->pass / (NB_PASSES - 1);
339 } else {
340 return 100 - 100 * s->y / s->cur_h;
341 }
342 }
343
344 /* process exactly one decompressed row */
png_handle_row(PNGDecContext * s,uint8_t * dst,ptrdiff_t dst_stride)345 static void png_handle_row(PNGDecContext *s, uint8_t *dst, ptrdiff_t dst_stride)
346 {
347 uint8_t *ptr, *last_row;
348 int got_line;
349
350 if (!s->interlace_type) {
351 ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
352 if (s->y == 0)
353 last_row = s->last_row;
354 else
355 last_row = ptr - dst_stride;
356
357 ff_png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
358 last_row, s->row_size, s->bpp);
359 /* loco lags by 1 row so that it doesn't interfere with top prediction */
360 if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
361 if (s->bit_depth == 16) {
362 deloco_rgb16((uint16_t *)(ptr - dst_stride), s->row_size / 2,
363 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
364 } else {
365 deloco_rgb8(ptr - dst_stride, s->row_size,
366 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
367 }
368 }
369 s->y++;
370 if (s->y == s->cur_h) {
371 s->pic_state |= PNG_ALLIMAGE;
372 if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
373 if (s->bit_depth == 16) {
374 deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
375 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
376 } else {
377 deloco_rgb8(ptr, s->row_size,
378 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
379 }
380 }
381 }
382 } else {
383 got_line = 0;
384 for (;;) {
385 ptr = dst + dst_stride * (s->y + s->y_offset) + s->x_offset * s->bpp;
386 if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
387 /* if we already read one row, it is time to stop to
388 * wait for the next one */
389 if (got_line)
390 break;
391 ff_png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
392 s->last_row, s->pass_row_size, s->bpp);
393 FFSWAP(uint8_t *, s->last_row, s->tmp_row);
394 FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
395 got_line = 1;
396 }
397 if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
398 png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
399 s->color_type, s->last_row);
400 }
401 s->y++;
402 if (s->y == s->cur_h) {
403 memset(s->last_row, 0, s->row_size);
404 for (;;) {
405 if (s->pass == NB_PASSES - 1) {
406 s->pic_state |= PNG_ALLIMAGE;
407 goto the_end;
408 } else {
409 s->pass++;
410 s->y = 0;
411 s->pass_row_size = ff_png_pass_row_size(s->pass,
412 s->bits_per_pixel,
413 s->cur_w);
414 s->crow_size = s->pass_row_size + 1;
415 if (s->pass_row_size != 0)
416 break;
417 /* skip pass if empty row */
418 }
419 }
420 }
421 }
422 the_end:;
423 }
424 }
425
png_decode_idat(PNGDecContext * s,GetByteContext * gb,uint8_t * dst,ptrdiff_t dst_stride)426 static int png_decode_idat(PNGDecContext *s, GetByteContext *gb,
427 uint8_t *dst, ptrdiff_t dst_stride)
428 {
429 z_stream *const zstream = &s->zstream.zstream;
430 int ret;
431 zstream->avail_in = bytestream2_get_bytes_left(gb);
432 zstream->next_in = gb->buffer;
433
434 /* decode one line if possible */
435 while (zstream->avail_in > 0) {
436 ret = inflate(zstream, Z_PARTIAL_FLUSH);
437 if (ret != Z_OK && ret != Z_STREAM_END) {
438 av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
439 return AVERROR_EXTERNAL;
440 }
441 if (zstream->avail_out == 0) {
442 if (!(s->pic_state & PNG_ALLIMAGE)) {
443 png_handle_row(s, dst, dst_stride);
444 }
445 zstream->avail_out = s->crow_size;
446 zstream->next_out = s->crow_buf;
447 }
448 if (ret == Z_STREAM_END && zstream->avail_in > 0) {
449 av_log(s->avctx, AV_LOG_WARNING,
450 "%d undecompressed bytes left in buffer\n", zstream->avail_in);
451 return 0;
452 }
453 }
454 return 0;
455 }
456
decode_zbuf(AVBPrint * bp,const uint8_t * data,const uint8_t * data_end,void * logctx)457 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
458 const uint8_t *data_end, void *logctx)
459 {
460 FFZStream z;
461 z_stream *const zstream = &z.zstream;
462 unsigned char *buf;
463 unsigned buf_size;
464 int ret = ff_inflate_init(&z, logctx);
465 if (ret < 0)
466 return ret;
467
468 zstream->next_in = data;
469 zstream->avail_in = data_end - data;
470 av_bprint_init(bp, 0, AV_BPRINT_SIZE_UNLIMITED);
471
472 while (zstream->avail_in > 0) {
473 av_bprint_get_buffer(bp, 2, &buf, &buf_size);
474 if (buf_size < 2) {
475 ret = AVERROR(ENOMEM);
476 goto fail;
477 }
478 zstream->next_out = buf;
479 zstream->avail_out = buf_size - 1;
480 ret = inflate(zstream, Z_PARTIAL_FLUSH);
481 if (ret != Z_OK && ret != Z_STREAM_END) {
482 ret = AVERROR_EXTERNAL;
483 goto fail;
484 }
485 bp->len += zstream->next_out - buf;
486 if (ret == Z_STREAM_END)
487 break;
488 }
489 ff_inflate_end(&z);
490 bp->str[bp->len] = 0;
491 return 0;
492
493 fail:
494 ff_inflate_end(&z);
495 av_bprint_finalize(bp, NULL);
496 return ret;
497 }
498
iso88591_to_utf8(const uint8_t * in,size_t size_in)499 static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
500 {
501 size_t extra = 0, i;
502 uint8_t *out, *q;
503
504 for (i = 0; i < size_in; i++)
505 extra += in[i] >= 0x80;
506 if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
507 return NULL;
508 q = out = av_malloc(size_in + extra + 1);
509 if (!out)
510 return NULL;
511 for (i = 0; i < size_in; i++) {
512 if (in[i] >= 0x80) {
513 *(q++) = 0xC0 | (in[i] >> 6);
514 *(q++) = 0x80 | (in[i] & 0x3F);
515 } else {
516 *(q++) = in[i];
517 }
518 }
519 *(q++) = 0;
520 return out;
521 }
522
decode_text_chunk(PNGDecContext * s,GetByteContext * gb,int compressed)523 static int decode_text_chunk(PNGDecContext *s, GetByteContext *gb, int compressed)
524 {
525 int ret, method;
526 const uint8_t *data = gb->buffer;
527 const uint8_t *data_end = gb->buffer_end;
528 const uint8_t *keyword = data;
529 const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
530 uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
531 unsigned text_len;
532 AVBPrint bp;
533
534 if (!keyword_end)
535 return AVERROR_INVALIDDATA;
536 data = keyword_end + 1;
537
538 if (compressed) {
539 if (data == data_end)
540 return AVERROR_INVALIDDATA;
541 method = *(data++);
542 if (method)
543 return AVERROR_INVALIDDATA;
544 if ((ret = decode_zbuf(&bp, data, data_end, s->avctx)) < 0)
545 return ret;
546 text_len = bp.len;
547 ret = av_bprint_finalize(&bp, (char **)&text);
548 if (ret < 0)
549 return ret;
550 } else {
551 text = (uint8_t *)data;
552 text_len = data_end - text;
553 }
554
555 kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
556 txt_utf8 = iso88591_to_utf8(text, text_len);
557 if (text != data)
558 av_free(text);
559 if (!(kw_utf8 && txt_utf8)) {
560 av_free(kw_utf8);
561 av_free(txt_utf8);
562 return AVERROR(ENOMEM);
563 }
564
565 av_dict_set(&s->frame_metadata, kw_utf8, txt_utf8,
566 AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
567 return 0;
568 }
569
decode_ihdr_chunk(AVCodecContext * avctx,PNGDecContext * s,GetByteContext * gb)570 static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s,
571 GetByteContext *gb)
572 {
573 if (bytestream2_get_bytes_left(gb) != 13)
574 return AVERROR_INVALIDDATA;
575
576 if (s->pic_state & PNG_IDAT) {
577 av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
578 return AVERROR_INVALIDDATA;
579 }
580
581 if (s->hdr_state & PNG_IHDR) {
582 av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
583 return AVERROR_INVALIDDATA;
584 }
585
586 s->width = s->cur_w = bytestream2_get_be32(gb);
587 s->height = s->cur_h = bytestream2_get_be32(gb);
588 if (av_image_check_size(s->width, s->height, 0, avctx)) {
589 s->cur_w = s->cur_h = s->width = s->height = 0;
590 av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
591 return AVERROR_INVALIDDATA;
592 }
593 s->bit_depth = bytestream2_get_byte(gb);
594 if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
595 s->bit_depth != 8 && s->bit_depth != 16) {
596 av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
597 goto error;
598 }
599 s->color_type = bytestream2_get_byte(gb);
600 s->compression_type = bytestream2_get_byte(gb);
601 if (s->compression_type) {
602 av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
603 goto error;
604 }
605 s->filter_type = bytestream2_get_byte(gb);
606 s->interlace_type = bytestream2_get_byte(gb);
607 s->hdr_state |= PNG_IHDR;
608 if (avctx->debug & FF_DEBUG_PICT_INFO)
609 av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
610 "compression_type=%d filter_type=%d interlace_type=%d\n",
611 s->width, s->height, s->bit_depth, s->color_type,
612 s->compression_type, s->filter_type, s->interlace_type);
613
614 return 0;
615 error:
616 s->cur_w = s->cur_h = s->width = s->height = 0;
617 s->bit_depth = 8;
618 return AVERROR_INVALIDDATA;
619 }
620
decode_phys_chunk(AVCodecContext * avctx,PNGDecContext * s,GetByteContext * gb)621 static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s,
622 GetByteContext *gb)
623 {
624 if (s->pic_state & PNG_IDAT) {
625 av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
626 return AVERROR_INVALIDDATA;
627 }
628 avctx->sample_aspect_ratio.num = bytestream2_get_be32(gb);
629 avctx->sample_aspect_ratio.den = bytestream2_get_be32(gb);
630 if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
631 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
632 bytestream2_skip(gb, 1); /* unit specifier */
633
634 return 0;
635 }
636
decode_idat_chunk(AVCodecContext * avctx,PNGDecContext * s,GetByteContext * gb,AVFrame * p)637 static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
638 GetByteContext *gb, AVFrame *p)
639 {
640 int ret;
641 size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
642
643 if (!p)
644 return AVERROR_INVALIDDATA;
645 if (!(s->hdr_state & PNG_IHDR)) {
646 av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
647 return AVERROR_INVALIDDATA;
648 }
649 if (!(s->pic_state & PNG_IDAT)) {
650 /* init image info */
651 ret = ff_set_dimensions(avctx, s->width, s->height);
652 if (ret < 0)
653 return ret;
654
655 s->channels = ff_png_get_nb_channels(s->color_type);
656 s->bits_per_pixel = s->bit_depth * s->channels;
657 s->bpp = (s->bits_per_pixel + 7) >> 3;
658 s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
659
660 if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
661 s->color_type == PNG_COLOR_TYPE_RGB) {
662 avctx->pix_fmt = AV_PIX_FMT_RGB24;
663 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
664 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
665 avctx->pix_fmt = AV_PIX_FMT_RGBA;
666 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
667 s->color_type == PNG_COLOR_TYPE_GRAY) {
668 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
669 } else if (s->bit_depth == 16 &&
670 s->color_type == PNG_COLOR_TYPE_GRAY) {
671 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
672 } else if (s->bit_depth == 16 &&
673 s->color_type == PNG_COLOR_TYPE_RGB) {
674 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
675 } else if (s->bit_depth == 16 &&
676 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
677 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
678 } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
679 s->color_type == PNG_COLOR_TYPE_PALETTE) {
680 avctx->pix_fmt = avctx->codec_id == AV_CODEC_ID_APNG ? AV_PIX_FMT_RGBA : AV_PIX_FMT_PAL8;
681 } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
682 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
683 } else if (s->bit_depth == 8 &&
684 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
685 avctx->pix_fmt = AV_PIX_FMT_YA8;
686 } else if (s->bit_depth == 16 &&
687 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
688 avctx->pix_fmt = AV_PIX_FMT_YA16BE;
689 } else {
690 avpriv_report_missing_feature(avctx,
691 "Bit depth %d color type %d",
692 s->bit_depth, s->color_type);
693 return AVERROR_PATCHWELCOME;
694 }
695
696 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
697 switch (avctx->pix_fmt) {
698 case AV_PIX_FMT_RGB24:
699 avctx->pix_fmt = AV_PIX_FMT_RGBA;
700 break;
701
702 case AV_PIX_FMT_RGB48BE:
703 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
704 break;
705
706 case AV_PIX_FMT_GRAY8:
707 avctx->pix_fmt = AV_PIX_FMT_YA8;
708 break;
709
710 case AV_PIX_FMT_GRAY16BE:
711 avctx->pix_fmt = AV_PIX_FMT_YA16BE;
712 break;
713
714 default:
715 avpriv_request_sample(avctx, "bit depth %d "
716 "and color type %d with TRNS",
717 s->bit_depth, s->color_type);
718 return AVERROR_INVALIDDATA;
719 }
720
721 s->bpp += byte_depth;
722 }
723
724 ff_thread_release_ext_buffer(avctx, &s->picture);
725 if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
726 /* We only need a buffer for the current picture. */
727 ret = ff_thread_get_buffer(avctx, p, 0);
728 if (ret < 0)
729 return ret;
730 } else if (s->dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
731 /* We need a buffer for the current picture as well as
732 * a buffer for the reference to retain. */
733 ret = ff_thread_get_ext_buffer(avctx, &s->picture,
734 AV_GET_BUFFER_FLAG_REF);
735 if (ret < 0)
736 return ret;
737 ret = ff_thread_get_buffer(avctx, p, 0);
738 if (ret < 0)
739 return ret;
740 } else {
741 /* The picture output this time and the reference to retain coincide. */
742 if ((ret = ff_thread_get_ext_buffer(avctx, &s->picture,
743 AV_GET_BUFFER_FLAG_REF)) < 0)
744 return ret;
745 ret = av_frame_ref(p, s->picture.f);
746 if (ret < 0)
747 return ret;
748 }
749
750 p->pict_type = AV_PICTURE_TYPE_I;
751 p->key_frame = 1;
752 p->interlaced_frame = !!s->interlace_type;
753
754 ff_thread_finish_setup(avctx);
755
756 /* compute the compressed row size */
757 if (!s->interlace_type) {
758 s->crow_size = s->row_size + 1;
759 } else {
760 s->pass = 0;
761 s->pass_row_size = ff_png_pass_row_size(s->pass,
762 s->bits_per_pixel,
763 s->cur_w);
764 s->crow_size = s->pass_row_size + 1;
765 }
766 ff_dlog(avctx, "row_size=%d crow_size =%d\n",
767 s->row_size, s->crow_size);
768
769 /* copy the palette if needed */
770 if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
771 memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
772 /* empty row is used if differencing to the first row */
773 av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size);
774 if (!s->last_row)
775 return AVERROR_INVALIDDATA;
776 if (s->interlace_type ||
777 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
778 av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size);
779 if (!s->tmp_row)
780 return AVERROR_INVALIDDATA;
781 }
782 /* compressed row */
783 av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
784 if (!s->buffer)
785 return AVERROR(ENOMEM);
786
787 /* we want crow_buf+1 to be 16-byte aligned */
788 s->crow_buf = s->buffer + 15;
789 s->zstream.zstream.avail_out = s->crow_size;
790 s->zstream.zstream.next_out = s->crow_buf;
791 }
792
793 s->pic_state |= PNG_IDAT;
794
795 /* set image to non-transparent bpp while decompressing */
796 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
797 s->bpp -= byte_depth;
798
799 ret = png_decode_idat(s, gb, p->data[0], p->linesize[0]);
800
801 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
802 s->bpp += byte_depth;
803
804 if (ret < 0)
805 return ret;
806
807 return 0;
808 }
809
decode_plte_chunk(AVCodecContext * avctx,PNGDecContext * s,GetByteContext * gb)810 static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s,
811 GetByteContext *gb)
812 {
813 int length = bytestream2_get_bytes_left(gb);
814 int n, i, r, g, b;
815
816 if ((length % 3) != 0 || length > 256 * 3)
817 return AVERROR_INVALIDDATA;
818 /* read the palette */
819 n = length / 3;
820 for (i = 0; i < n; i++) {
821 r = bytestream2_get_byte(gb);
822 g = bytestream2_get_byte(gb);
823 b = bytestream2_get_byte(gb);
824 s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
825 }
826 for (; i < 256; i++)
827 s->palette[i] = (0xFFU << 24);
828 s->hdr_state |= PNG_PLTE;
829
830 return 0;
831 }
832
decode_trns_chunk(AVCodecContext * avctx,PNGDecContext * s,GetByteContext * gb)833 static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s,
834 GetByteContext *gb)
835 {
836 int length = bytestream2_get_bytes_left(gb);
837 int v, i;
838
839 if (!(s->hdr_state & PNG_IHDR)) {
840 av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
841 return AVERROR_INVALIDDATA;
842 }
843
844 if (s->pic_state & PNG_IDAT) {
845 av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
846 return AVERROR_INVALIDDATA;
847 }
848
849 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
850 if (length > 256 || !(s->hdr_state & PNG_PLTE))
851 return AVERROR_INVALIDDATA;
852
853 for (i = 0; i < length; i++) {
854 unsigned v = bytestream2_get_byte(gb);
855 s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
856 }
857 } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
858 if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
859 (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
860 s->bit_depth == 1)
861 return AVERROR_INVALIDDATA;
862
863 for (i = 0; i < length / 2; i++) {
864 /* only use the least significant bits */
865 v = av_mod_uintp2(bytestream2_get_be16(gb), s->bit_depth);
866
867 if (s->bit_depth > 8)
868 AV_WB16(&s->transparent_color_be[2 * i], v);
869 else
870 s->transparent_color_be[i] = v;
871 }
872 } else {
873 return AVERROR_INVALIDDATA;
874 }
875
876 s->has_trns = 1;
877
878 return 0;
879 }
880
decode_iccp_chunk(PNGDecContext * s,GetByteContext * gb)881 static int decode_iccp_chunk(PNGDecContext *s, GetByteContext *gb)
882 {
883 int ret, cnt = 0;
884 AVBPrint bp;
885
886 while ((s->iccp_name[cnt++] = bytestream2_get_byte(gb)) && cnt < 81);
887 if (cnt > 80) {
888 av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
889 ret = AVERROR_INVALIDDATA;
890 goto fail;
891 }
892
893 if (bytestream2_get_byte(gb) != 0) {
894 av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
895 ret = AVERROR_INVALIDDATA;
896 goto fail;
897 }
898
899 if ((ret = decode_zbuf(&bp, gb->buffer, gb->buffer_end, s->avctx)) < 0)
900 return ret;
901
902 av_freep(&s->iccp_data);
903 ret = av_bprint_finalize(&bp, (char **)&s->iccp_data);
904 if (ret < 0)
905 return ret;
906 s->iccp_data_len = bp.len;
907
908 return 0;
909 fail:
910 s->iccp_name[0] = 0;
911 return ret;
912 }
913
handle_small_bpp(PNGDecContext * s,AVFrame * p)914 static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
915 {
916 if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
917 int i, j, k;
918 uint8_t *pd = p->data[0];
919 for (j = 0; j < s->height; j++) {
920 i = s->width / 8;
921 for (k = 7; k >= 1; k--)
922 if ((s->width&7) >= k)
923 pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
924 for (i--; i >= 0; i--) {
925 pd[8*i + 7]= pd[i] & 1;
926 pd[8*i + 6]= (pd[i]>>1) & 1;
927 pd[8*i + 5]= (pd[i]>>2) & 1;
928 pd[8*i + 4]= (pd[i]>>3) & 1;
929 pd[8*i + 3]= (pd[i]>>4) & 1;
930 pd[8*i + 2]= (pd[i]>>5) & 1;
931 pd[8*i + 1]= (pd[i]>>6) & 1;
932 pd[8*i + 0]= pd[i]>>7;
933 }
934 pd += p->linesize[0];
935 }
936 } else if (s->bits_per_pixel == 2) {
937 int i, j;
938 uint8_t *pd = p->data[0];
939 for (j = 0; j < s->height; j++) {
940 i = s->width / 4;
941 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
942 if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
943 if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
944 if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
945 for (i--; i >= 0; i--) {
946 pd[4*i + 3]= pd[i] & 3;
947 pd[4*i + 2]= (pd[i]>>2) & 3;
948 pd[4*i + 1]= (pd[i]>>4) & 3;
949 pd[4*i + 0]= pd[i]>>6;
950 }
951 } else {
952 if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
953 if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
954 if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
955 for (i--; i >= 0; i--) {
956 pd[4*i + 3]= ( pd[i] & 3)*0x55;
957 pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
958 pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
959 pd[4*i + 0]= ( pd[i]>>6 )*0x55;
960 }
961 }
962 pd += p->linesize[0];
963 }
964 } else if (s->bits_per_pixel == 4) {
965 int i, j;
966 uint8_t *pd = p->data[0];
967 for (j = 0; j < s->height; j++) {
968 i = s->width/2;
969 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
970 if (s->width&1) pd[2*i+0]= pd[i]>>4;
971 for (i--; i >= 0; i--) {
972 pd[2*i + 1] = pd[i] & 15;
973 pd[2*i + 0] = pd[i] >> 4;
974 }
975 } else {
976 if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
977 for (i--; i >= 0; i--) {
978 pd[2*i + 1] = (pd[i] & 15) * 0x11;
979 pd[2*i + 0] = (pd[i] >> 4) * 0x11;
980 }
981 }
982 pd += p->linesize[0];
983 }
984 }
985 }
986
decode_fctl_chunk(AVCodecContext * avctx,PNGDecContext * s,GetByteContext * gb)987 static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
988 GetByteContext *gb)
989 {
990 uint32_t sequence_number;
991 int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
992
993 if (bytestream2_get_bytes_left(gb) != APNG_FCTL_CHUNK_SIZE)
994 return AVERROR_INVALIDDATA;
995
996 if (!(s->hdr_state & PNG_IHDR)) {
997 av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
998 return AVERROR_INVALIDDATA;
999 }
1000
1001 if (s->pic_state & PNG_IDAT) {
1002 av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
1003 return AVERROR_INVALIDDATA;
1004 }
1005
1006 sequence_number = bytestream2_get_be32(gb);
1007 cur_w = bytestream2_get_be32(gb);
1008 cur_h = bytestream2_get_be32(gb);
1009 x_offset = bytestream2_get_be32(gb);
1010 y_offset = bytestream2_get_be32(gb);
1011 bytestream2_skip(gb, 4); /* delay_num (2), delay_den (2) */
1012 dispose_op = bytestream2_get_byte(gb);
1013 blend_op = bytestream2_get_byte(gb);
1014
1015 if (sequence_number == 0 &&
1016 (cur_w != s->width ||
1017 cur_h != s->height ||
1018 x_offset != 0 ||
1019 y_offset != 0) ||
1020 cur_w <= 0 || cur_h <= 0 ||
1021 x_offset < 0 || y_offset < 0 ||
1022 cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1023 return AVERROR_INVALIDDATA;
1024
1025 if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1026 av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1027 return AVERROR_INVALIDDATA;
1028 }
1029
1030 if ((sequence_number == 0 || !s->last_picture.f) &&
1031 dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1032 // No previous frame to revert to for the first frame
1033 // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1034 dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1035 }
1036
1037 if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1038 avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1039 avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1040 avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1041 avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1042 avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1043 )) {
1044 // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1045 blend_op = APNG_BLEND_OP_SOURCE;
1046 }
1047
1048 s->cur_w = cur_w;
1049 s->cur_h = cur_h;
1050 s->x_offset = x_offset;
1051 s->y_offset = y_offset;
1052 s->dispose_op = dispose_op;
1053 s->blend_op = blend_op;
1054
1055 return 0;
1056 }
1057
handle_p_frame_png(PNGDecContext * s,AVFrame * p)1058 static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
1059 {
1060 int i, j;
1061 uint8_t *pd = p->data[0];
1062 uint8_t *pd_last = s->last_picture.f->data[0];
1063 int ls = av_image_get_linesize(p->format, s->width, 0);
1064
1065 ls = FFMIN(ls, s->width * s->bpp);
1066
1067 ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1068 for (j = 0; j < s->height; j++) {
1069 for (i = 0; i < ls; i++)
1070 pd[i] += pd_last[i];
1071 pd += p->linesize[0];
1072 pd_last += s->last_picture.f->linesize[0];
1073 }
1074 }
1075
1076 // divide by 255 and round to nearest
1077 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1078 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1079
handle_p_frame_apng(AVCodecContext * avctx,PNGDecContext * s,AVFrame * p)1080 static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s,
1081 AVFrame *p)
1082 {
1083 uint8_t *dst = p->data[0];
1084 ptrdiff_t dst_stride = p->linesize[0];
1085 const uint8_t *src = s->last_picture.f->data[0];
1086 ptrdiff_t src_stride = s->last_picture.f->linesize[0];
1087 const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1088
1089 size_t x, y;
1090
1091 if (s->blend_op == APNG_BLEND_OP_OVER &&
1092 avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1093 avctx->pix_fmt != AV_PIX_FMT_GRAY8A) {
1094 avpriv_request_sample(avctx, "Blending with pixel format %s",
1095 av_get_pix_fmt_name(avctx->pix_fmt));
1096 return AVERROR_PATCHWELCOME;
1097 }
1098
1099 ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1100
1101 // copy unchanged rectangles from the last frame
1102 for (y = 0; y < s->y_offset; y++)
1103 memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1104 for (y = s->y_offset; y < s->y_offset + s->cur_h; y++) {
1105 memcpy(dst + y * dst_stride, src + y * src_stride, s->x_offset * bpp);
1106 memcpy(dst + y * dst_stride + (s->x_offset + s->cur_w) * bpp,
1107 src + y * src_stride + (s->x_offset + s->cur_w) * bpp,
1108 (p->width - s->cur_w - s->x_offset) * bpp);
1109 }
1110 for (y = s->y_offset + s->cur_h; y < p->height; y++)
1111 memcpy(dst + y * dst_stride, src + y * src_stride, p->width * bpp);
1112
1113 if (s->blend_op == APNG_BLEND_OP_OVER) {
1114 // Perform blending
1115 for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1116 uint8_t *foreground = dst + dst_stride * y + bpp * s->x_offset;
1117 const uint8_t *background = src + src_stride * y + bpp * s->x_offset;
1118 for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += bpp, background += bpp) {
1119 size_t b;
1120 uint8_t foreground_alpha, background_alpha, output_alpha;
1121 uint8_t output[10];
1122
1123 // Since we might be blending alpha onto alpha, we use the following equations:
1124 // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1125 // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1126
1127 switch (avctx->pix_fmt) {
1128 case AV_PIX_FMT_RGBA:
1129 foreground_alpha = foreground[3];
1130 background_alpha = background[3];
1131 break;
1132
1133 case AV_PIX_FMT_GRAY8A:
1134 foreground_alpha = foreground[1];
1135 background_alpha = background[1];
1136 break;
1137 }
1138
1139 if (foreground_alpha == 255)
1140 continue;
1141
1142 if (foreground_alpha == 0) {
1143 memcpy(foreground, background, bpp);
1144 continue;
1145 }
1146
1147 output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1148
1149 av_assert0(bpp <= 10);
1150
1151 for (b = 0; b < bpp - 1; ++b) {
1152 if (output_alpha == 0) {
1153 output[b] = 0;
1154 } else if (background_alpha == 255) {
1155 output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1156 } else {
1157 output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1158 }
1159 }
1160 output[b] = output_alpha;
1161 memcpy(foreground, output, bpp);
1162 }
1163 }
1164 }
1165
1166 return 0;
1167 }
1168
apng_reset_background(PNGDecContext * s,const AVFrame * p)1169 static void apng_reset_background(PNGDecContext *s, const AVFrame *p)
1170 {
1171 // need to reset a rectangle to black
1172 av_unused int ret = av_frame_copy(s->picture.f, p);
1173 const int bpp = s->color_type == PNG_COLOR_TYPE_PALETTE ? 4 : s->bpp;
1174 const ptrdiff_t dst_stride = s->picture.f->linesize[0];
1175 uint8_t *dst = s->picture.f->data[0] + s->y_offset * dst_stride + bpp * s->x_offset;
1176
1177 av_assert1(ret >= 0);
1178
1179 for (size_t y = 0; y < s->cur_h; y++) {
1180 memset(dst, 0, bpp * s->cur_w);
1181 dst += dst_stride;
1182 }
1183 }
1184
decode_frame_common(AVCodecContext * avctx,PNGDecContext * s,AVFrame * p,const AVPacket * avpkt)1185 static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
1186 AVFrame *p, const AVPacket *avpkt)
1187 {
1188 const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1189 uint32_t tag, length;
1190 int decode_next_dat = 0;
1191 int i, ret;
1192
1193 for (;;) {
1194 GetByteContext gb_chunk;
1195
1196 length = bytestream2_get_bytes_left(&s->gb);
1197 if (length <= 0) {
1198
1199 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1200 avctx->skip_frame == AVDISCARD_ALL) {
1201 return 0;
1202 }
1203
1204 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1205 if (!(s->pic_state & PNG_IDAT))
1206 return 0;
1207 else
1208 goto exit_loop;
1209 }
1210 av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1211 if ( s->pic_state & PNG_ALLIMAGE
1212 && avctx->strict_std_compliance <= FF_COMPLIANCE_NORMAL)
1213 goto exit_loop;
1214 ret = AVERROR_INVALIDDATA;
1215 goto fail;
1216 }
1217
1218 length = bytestream2_get_be32(&s->gb);
1219 if (length > 0x7fffffff || length + 8 > bytestream2_get_bytes_left(&s->gb)) {
1220 av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1221 ret = AVERROR_INVALIDDATA;
1222 goto fail;
1223 }
1224 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1225 uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1226 uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1227 if (crc_sig ^ crc_cal) {
1228 av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1229 if (avctx->err_recognition & AV_EF_EXPLODE) {
1230 av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1231 ret = AVERROR_INVALIDDATA;
1232 goto fail;
1233 }
1234 av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1235 bytestream2_skip(&s->gb, length + 8); /* tag */
1236 continue;
1237 }
1238 }
1239 tag = bytestream2_get_le32(&s->gb);
1240 if (avctx->debug & FF_DEBUG_STARTCODE)
1241 av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1242 av_fourcc2str(tag), length);
1243
1244 bytestream2_init(&gb_chunk, s->gb.buffer, length);
1245 bytestream2_skip(&s->gb, length + 4);
1246
1247 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1248 avctx->skip_frame == AVDISCARD_ALL) {
1249 switch(tag) {
1250 case MKTAG('I', 'H', 'D', 'R'):
1251 case MKTAG('p', 'H', 'Y', 's'):
1252 case MKTAG('t', 'E', 'X', 't'):
1253 case MKTAG('I', 'D', 'A', 'T'):
1254 case MKTAG('t', 'R', 'N', 'S'):
1255 break;
1256 default:
1257 continue;
1258 }
1259 }
1260
1261 switch (tag) {
1262 case MKTAG('I', 'H', 'D', 'R'):
1263 if ((ret = decode_ihdr_chunk(avctx, s, &gb_chunk)) < 0)
1264 goto fail;
1265 break;
1266 case MKTAG('p', 'H', 'Y', 's'):
1267 if ((ret = decode_phys_chunk(avctx, s, &gb_chunk)) < 0)
1268 goto fail;
1269 break;
1270 case MKTAG('f', 'c', 'T', 'L'):
1271 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1272 continue;
1273 if ((ret = decode_fctl_chunk(avctx, s, &gb_chunk)) < 0)
1274 goto fail;
1275 decode_next_dat = 1;
1276 break;
1277 case MKTAG('f', 'd', 'A', 'T'):
1278 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1279 continue;
1280 if (!decode_next_dat || bytestream2_get_bytes_left(&gb_chunk) < 4) {
1281 ret = AVERROR_INVALIDDATA;
1282 goto fail;
1283 }
1284 bytestream2_get_be32(&gb_chunk);
1285 /* fallthrough */
1286 case MKTAG('I', 'D', 'A', 'T'):
1287 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1288 continue;
1289 if ((ret = decode_idat_chunk(avctx, s, &gb_chunk, p)) < 0)
1290 goto fail;
1291 break;
1292 case MKTAG('P', 'L', 'T', 'E'):
1293 decode_plte_chunk(avctx, s, &gb_chunk);
1294 break;
1295 case MKTAG('t', 'R', 'N', 'S'):
1296 decode_trns_chunk(avctx, s, &gb_chunk);
1297 break;
1298 case MKTAG('t', 'E', 'X', 't'):
1299 if (decode_text_chunk(s, &gb_chunk, 0) < 0)
1300 av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1301 break;
1302 case MKTAG('z', 'T', 'X', 't'):
1303 if (decode_text_chunk(s, &gb_chunk, 1) < 0)
1304 av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1305 break;
1306 case MKTAG('s', 'T', 'E', 'R'): {
1307 int mode = bytestream2_get_byte(&gb_chunk);
1308
1309 if (mode == 0 || mode == 1) {
1310 s->stereo_mode = mode;
1311 } else {
1312 av_log(avctx, AV_LOG_WARNING,
1313 "Unknown value in sTER chunk (%d)\n", mode);
1314 }
1315 break;
1316 }
1317 case MKTAG('i', 'C', 'C', 'P'): {
1318 if ((ret = decode_iccp_chunk(s, &gb_chunk)) < 0)
1319 goto fail;
1320 break;
1321 }
1322 case MKTAG('c', 'H', 'R', 'M'): {
1323 s->have_chrm = 1;
1324
1325 s->white_point[0] = bytestream2_get_be32(&gb_chunk);
1326 s->white_point[1] = bytestream2_get_be32(&gb_chunk);
1327
1328 /* RGB Primaries */
1329 for (i = 0; i < 3; i++) {
1330 s->display_primaries[i][0] = bytestream2_get_be32(&gb_chunk);
1331 s->display_primaries[i][1] = bytestream2_get_be32(&gb_chunk);
1332 }
1333
1334 break;
1335 }
1336 case MKTAG('g', 'A', 'M', 'A'): {
1337 AVBPrint bp;
1338 char *gamma_str;
1339 int num = bytestream2_get_be32(&gb_chunk);
1340
1341 av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
1342 av_bprintf(&bp, "%i/%i", num, 100000);
1343 ret = av_bprint_finalize(&bp, &gamma_str);
1344 if (ret < 0)
1345 return ret;
1346
1347 av_dict_set(&s->frame_metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1348
1349 break;
1350 }
1351 case MKTAG('I', 'E', 'N', 'D'):
1352 if (!(s->pic_state & PNG_ALLIMAGE))
1353 av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1354 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1355 ret = AVERROR_INVALIDDATA;
1356 goto fail;
1357 }
1358 goto exit_loop;
1359 }
1360 }
1361 exit_loop:
1362
1363 if (!p)
1364 return AVERROR_INVALIDDATA;
1365
1366 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1367 avctx->skip_frame == AVDISCARD_ALL) {
1368 return 0;
1369 }
1370
1371 if (percent_missing(s) > avctx->discard_damaged_percentage)
1372 return AVERROR_INVALIDDATA;
1373
1374 if (s->bits_per_pixel <= 4)
1375 handle_small_bpp(s, p);
1376
1377 if (s->color_type == PNG_COLOR_TYPE_PALETTE && avctx->codec_id == AV_CODEC_ID_APNG) {
1378 for (int y = 0; y < s->height; y++) {
1379 uint8_t *row = &p->data[0][p->linesize[0] * y];
1380
1381 for (int x = s->width - 1; x >= 0; x--) {
1382 const uint8_t idx = row[x];
1383
1384 row[4*x+2] = s->palette[idx] & 0xFF;
1385 row[4*x+1] = (s->palette[idx] >> 8 ) & 0xFF;
1386 row[4*x+0] = (s->palette[idx] >> 16) & 0xFF;
1387 row[4*x+3] = s->palette[idx] >> 24;
1388 }
1389 }
1390 }
1391
1392 /* apply transparency if needed */
1393 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
1394 size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
1395 size_t raw_bpp = s->bpp - byte_depth;
1396 unsigned x, y;
1397
1398 av_assert0(s->bit_depth > 1);
1399
1400 for (y = 0; y < s->height; ++y) {
1401 uint8_t *row = &p->data[0][p->linesize[0] * y];
1402
1403 if (s->bpp == 2 && byte_depth == 1) {
1404 uint8_t *pixel = &row[2 * s->width - 1];
1405 uint8_t *rowp = &row[1 * s->width - 1];
1406 int tcolor = s->transparent_color_be[0];
1407 for (x = s->width; x > 0; --x) {
1408 *pixel-- = *rowp == tcolor ? 0 : 0xff;
1409 *pixel-- = *rowp--;
1410 }
1411 } else if (s->bpp == 4 && byte_depth == 1) {
1412 uint8_t *pixel = &row[4 * s->width - 1];
1413 uint8_t *rowp = &row[3 * s->width - 1];
1414 int tcolor = AV_RL24(s->transparent_color_be);
1415 for (x = s->width; x > 0; --x) {
1416 *pixel-- = AV_RL24(rowp-2) == tcolor ? 0 : 0xff;
1417 *pixel-- = *rowp--;
1418 *pixel-- = *rowp--;
1419 *pixel-- = *rowp--;
1420 }
1421 } else {
1422 /* since we're updating in-place, we have to go from right to left */
1423 for (x = s->width; x > 0; --x) {
1424 uint8_t *pixel = &row[s->bpp * (x - 1)];
1425 memmove(pixel, &row[raw_bpp * (x - 1)], raw_bpp);
1426
1427 if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1428 memset(&pixel[raw_bpp], 0, byte_depth);
1429 } else {
1430 memset(&pixel[raw_bpp], 0xff, byte_depth);
1431 }
1432 }
1433 }
1434 }
1435 }
1436
1437 /* handle P-frames only if a predecessor frame is available */
1438 if (s->last_picture.f->data[0]) {
1439 if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
1440 && s->last_picture.f->width == p->width
1441 && s->last_picture.f->height== p->height
1442 && s->last_picture.f->format== p->format
1443 ) {
1444 if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1445 handle_p_frame_png(s, p);
1446 else if (CONFIG_APNG_DECODER &&
1447 avctx->codec_id == AV_CODEC_ID_APNG &&
1448 (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1449 goto fail;
1450 }
1451 }
1452 if (CONFIG_APNG_DECODER && s->dispose_op == APNG_DISPOSE_OP_BACKGROUND)
1453 apng_reset_background(s, p);
1454
1455 ff_thread_report_progress(&s->picture, INT_MAX, 0);
1456
1457 return 0;
1458
1459 fail:
1460 ff_thread_report_progress(&s->picture, INT_MAX, 0);
1461 return ret;
1462 }
1463
clear_frame_metadata(PNGDecContext * s)1464 static void clear_frame_metadata(PNGDecContext *s)
1465 {
1466 av_freep(&s->iccp_data);
1467 s->iccp_data_len = 0;
1468 s->iccp_name[0] = 0;
1469
1470 s->stereo_mode = -1;
1471
1472 s->have_chrm = 0;
1473
1474 av_dict_free(&s->frame_metadata);
1475 }
1476
output_frame(PNGDecContext * s,AVFrame * f)1477 static int output_frame(PNGDecContext *s, AVFrame *f)
1478 {
1479 int ret;
1480
1481 if (s->iccp_data) {
1482 AVFrameSideData *sd = av_frame_new_side_data(f, AV_FRAME_DATA_ICC_PROFILE, s->iccp_data_len);
1483 if (!sd) {
1484 ret = AVERROR(ENOMEM);
1485 goto fail;
1486 }
1487 memcpy(sd->data, s->iccp_data, s->iccp_data_len);
1488
1489 av_dict_set(&sd->metadata, "name", s->iccp_name, 0);
1490 }
1491
1492 if (s->stereo_mode >= 0) {
1493 AVStereo3D *stereo3d = av_stereo3d_create_side_data(f);
1494 if (!stereo3d) {
1495 ret = AVERROR(ENOMEM);
1496 goto fail;
1497 }
1498
1499 stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1500 stereo3d->flags = s->stereo_mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1501 }
1502
1503 if (s->have_chrm) {
1504 AVMasteringDisplayMetadata *mdm = av_mastering_display_metadata_create_side_data(f);
1505 if (!mdm) {
1506 ret = AVERROR(ENOMEM);
1507 goto fail;
1508 }
1509
1510 mdm->white_point[0] = av_make_q(s->white_point[0], 100000);
1511 mdm->white_point[1] = av_make_q(s->white_point[1], 100000);
1512
1513 /* RGB Primaries */
1514 for (int i = 0; i < 3; i++) {
1515 mdm->display_primaries[i][0] = av_make_q(s->display_primaries[i][0], 100000);
1516 mdm->display_primaries[i][1] = av_make_q(s->display_primaries[i][1], 100000);
1517 }
1518
1519 mdm->has_primaries = 1;
1520 }
1521
1522 FFSWAP(AVDictionary*, f->metadata, s->frame_metadata);
1523
1524 return 0;
1525 fail:
1526 av_frame_unref(f);
1527 return ret;
1528 }
1529
1530 #if CONFIG_PNG_DECODER
decode_frame_png(AVCodecContext * avctx,AVFrame * p,int * got_frame,AVPacket * avpkt)1531 static int decode_frame_png(AVCodecContext *avctx, AVFrame *p,
1532 int *got_frame, AVPacket *avpkt)
1533 {
1534 PNGDecContext *const s = avctx->priv_data;
1535 const uint8_t *buf = avpkt->data;
1536 int buf_size = avpkt->size;
1537 int64_t sig;
1538 int ret;
1539
1540 clear_frame_metadata(s);
1541
1542 bytestream2_init(&s->gb, buf, buf_size);
1543
1544 /* check signature */
1545 sig = bytestream2_get_be64(&s->gb);
1546 if (sig != PNGSIG &&
1547 sig != MNGSIG) {
1548 av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1549 return AVERROR_INVALIDDATA;
1550 }
1551
1552 s->y = s->has_trns = 0;
1553 s->hdr_state = 0;
1554 s->pic_state = 0;
1555
1556 /* Reset z_stream */
1557 ret = inflateReset(&s->zstream.zstream);
1558 if (ret != Z_OK)
1559 return AVERROR_EXTERNAL;
1560
1561 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1562 goto the_end;
1563
1564 if (avctx->skip_frame == AVDISCARD_ALL) {
1565 *got_frame = 0;
1566 ret = bytestream2_tell(&s->gb);
1567 goto the_end;
1568 }
1569
1570 ret = output_frame(s, p);
1571 if (ret < 0)
1572 goto the_end;
1573
1574 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1575 ff_thread_release_ext_buffer(avctx, &s->last_picture);
1576 FFSWAP(ThreadFrame, s->picture, s->last_picture);
1577 }
1578
1579 *got_frame = 1;
1580
1581 ret = bytestream2_tell(&s->gb);
1582 the_end:
1583 s->crow_buf = NULL;
1584 return ret;
1585 }
1586 #endif
1587
1588 #if CONFIG_APNG_DECODER
decode_frame_apng(AVCodecContext * avctx,AVFrame * p,int * got_frame,AVPacket * avpkt)1589 static int decode_frame_apng(AVCodecContext *avctx, AVFrame *p,
1590 int *got_frame, AVPacket *avpkt)
1591 {
1592 PNGDecContext *const s = avctx->priv_data;
1593 int ret;
1594
1595 clear_frame_metadata(s);
1596
1597 if (!(s->hdr_state & PNG_IHDR)) {
1598 if (!avctx->extradata_size)
1599 return AVERROR_INVALIDDATA;
1600
1601 if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1602 return AVERROR_EXTERNAL;
1603 bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1604 if ((ret = decode_frame_common(avctx, s, NULL, avpkt)) < 0)
1605 return ret;
1606 }
1607
1608 /* reset state for a new frame */
1609 if ((ret = inflateReset(&s->zstream.zstream)) != Z_OK)
1610 return AVERROR_EXTERNAL;
1611 s->y = 0;
1612 s->pic_state = 0;
1613 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1614 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1615 return ret;
1616
1617 if (!(s->pic_state & PNG_ALLIMAGE))
1618 av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1619 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT)))
1620 return AVERROR_INVALIDDATA;
1621
1622 ret = output_frame(s, p);
1623 if (ret < 0)
1624 return ret;
1625
1626 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1627 if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1628 ff_thread_release_ext_buffer(avctx, &s->picture);
1629 } else {
1630 ff_thread_release_ext_buffer(avctx, &s->last_picture);
1631 FFSWAP(ThreadFrame, s->picture, s->last_picture);
1632 }
1633 }
1634
1635 *got_frame = 1;
1636 return bytestream2_tell(&s->gb);
1637 }
1638 #endif
1639
1640 #if HAVE_THREADS
update_thread_context(AVCodecContext * dst,const AVCodecContext * src)1641 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1642 {
1643 PNGDecContext *psrc = src->priv_data;
1644 PNGDecContext *pdst = dst->priv_data;
1645 ThreadFrame *src_frame = NULL;
1646 int ret;
1647
1648 if (dst == src)
1649 return 0;
1650
1651 if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1652
1653 pdst->width = psrc->width;
1654 pdst->height = psrc->height;
1655 pdst->bit_depth = psrc->bit_depth;
1656 pdst->color_type = psrc->color_type;
1657 pdst->compression_type = psrc->compression_type;
1658 pdst->interlace_type = psrc->interlace_type;
1659 pdst->filter_type = psrc->filter_type;
1660 pdst->has_trns = psrc->has_trns;
1661 memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1662
1663 memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1664
1665 pdst->hdr_state |= psrc->hdr_state;
1666 }
1667
1668 src_frame = psrc->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
1669 &psrc->last_picture : &psrc->picture;
1670
1671 ff_thread_release_ext_buffer(dst, &pdst->last_picture);
1672 if (src_frame && src_frame->f->data[0]) {
1673 ret = ff_thread_ref_frame(&pdst->last_picture, src_frame);
1674 if (ret < 0)
1675 return ret;
1676 }
1677
1678 return 0;
1679 }
1680 #endif
1681
png_dec_init(AVCodecContext * avctx)1682 static av_cold int png_dec_init(AVCodecContext *avctx)
1683 {
1684 PNGDecContext *s = avctx->priv_data;
1685
1686 avctx->color_range = AVCOL_RANGE_JPEG;
1687
1688 s->avctx = avctx;
1689 s->last_picture.f = av_frame_alloc();
1690 s->picture.f = av_frame_alloc();
1691 if (!s->last_picture.f || !s->picture.f)
1692 return AVERROR(ENOMEM);
1693
1694 ff_pngdsp_init(&s->dsp);
1695
1696 return ff_inflate_init(&s->zstream, avctx);
1697 }
1698
png_dec_end(AVCodecContext * avctx)1699 static av_cold int png_dec_end(AVCodecContext *avctx)
1700 {
1701 PNGDecContext *s = avctx->priv_data;
1702
1703 ff_thread_release_ext_buffer(avctx, &s->last_picture);
1704 av_frame_free(&s->last_picture.f);
1705 ff_thread_release_ext_buffer(avctx, &s->picture);
1706 av_frame_free(&s->picture.f);
1707 av_freep(&s->buffer);
1708 s->buffer_size = 0;
1709 av_freep(&s->last_row);
1710 s->last_row_size = 0;
1711 av_freep(&s->tmp_row);
1712 s->tmp_row_size = 0;
1713
1714 av_freep(&s->iccp_data);
1715 av_dict_free(&s->frame_metadata);
1716 ff_inflate_end(&s->zstream);
1717
1718 return 0;
1719 }
1720
1721 #if CONFIG_APNG_DECODER
1722 const FFCodec ff_apng_decoder = {
1723 .p.name = "apng",
1724 .p.long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1725 .p.type = AVMEDIA_TYPE_VIDEO,
1726 .p.id = AV_CODEC_ID_APNG,
1727 .priv_data_size = sizeof(PNGDecContext),
1728 .init = png_dec_init,
1729 .close = png_dec_end,
1730 FF_CODEC_DECODE_CB(decode_frame_apng),
1731 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1732 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1733 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
1734 FF_CODEC_CAP_ALLOCATE_PROGRESS,
1735 };
1736 #endif
1737
1738 #if CONFIG_PNG_DECODER
1739 const FFCodec ff_png_decoder = {
1740 .p.name = "png",
1741 .p.long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1742 .p.type = AVMEDIA_TYPE_VIDEO,
1743 .p.id = AV_CODEC_ID_PNG,
1744 .priv_data_size = sizeof(PNGDecContext),
1745 .init = png_dec_init,
1746 .close = png_dec_end,
1747 FF_CODEC_DECODE_CB(decode_frame_png),
1748 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1749 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1750 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_THREADSAFE |
1751 FF_CODEC_CAP_ALLOCATE_PROGRESS | FF_CODEC_CAP_INIT_CLEANUP,
1752 };
1753 #endif
1754