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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / pngdec.c
CommitLineData
2ba45a60
DM		 1/*
2 * PNG image format
3 * Copyright (c) 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22//#define DEBUG
23
24#include "libavutil/bprint.h"
25#include "libavutil/imgutils.h"
26#include "avcodec.h"
27#include "bytestream.h"
28#include "internal.h"
f6fa7814 29#include "apng.h"
2ba45a60
DM		 30#include "png.h"
31#include "pngdsp.h"
32#include "thread.h"
33
34#include <zlib.h>
35
36typedef struct PNGDecContext {
37 PNGDSPContext dsp;
38 AVCodecContext *avctx;
39
40 GetByteContext gb;
f6fa7814 41 ThreadFrame previous_picture;
2ba45a60
DM		 42 ThreadFrame last_picture;
43 ThreadFrame picture;
44
45 int state;
46 int width, height;
f6fa7814
DM		 47 int cur_w, cur_h;
48 int x_offset, y_offset;
49 uint8_t dispose_op, blend_op;
2ba45a60
DM		 50 int bit_depth;
51 int color_type;
52 int compression_type;
53 int interlace_type;
54 int filter_type;
55 int channels;
56 int bits_per_pixel;
57 int bpp;
58
f6fa7814 59 int frame_id;
2ba45a60
DM		 60 uint8_t *image_buf;
61 int image_linesize;
62 uint32_t palette[256];
63 uint8_t *crow_buf;
64 uint8_t *last_row;
65 unsigned int last_row_size;
66 uint8_t *tmp_row;
67 unsigned int tmp_row_size;
68 uint8_t *buffer;
69 int buffer_size;
70 int pass;
71 int crow_size; /* compressed row size (include filter type) */
72 int row_size; /* decompressed row size */
73 int pass_row_size; /* decompress row size of the current pass */
74 int y;
75 z_stream zstream;
76} PNGDecContext;
77
78/* Mask to determine which pixels are valid in a pass */
79static const uint8_t png_pass_mask[NB_PASSES] = {
80 0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
81};
82
83/* Mask to determine which y pixels can be written in a pass */
84static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
85 0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
86};
87
88/* Mask to determine which pixels to overwrite while displaying */
89static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
90 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
91};
92
93/* NOTE: we try to construct a good looking image at each pass. width
94 * is the original image width. We also do pixel format conversion at
95 * this stage */
96static void png_put_interlaced_row(uint8_t *dst, int width,
97 int bits_per_pixel, int pass,
98 int color_type, const uint8_t *src)
99{
100 int x, mask, dsp_mask, j, src_x, b, bpp;
101 uint8_t *d;
102 const uint8_t *s;
103
104 mask = png_pass_mask[pass];
105 dsp_mask = png_pass_dsp_mask[pass];
106
107 switch (bits_per_pixel) {
108 case 1:
109 src_x = 0;
110 for (x = 0; x < width; x++) {
111 j = (x & 7);
112 if ((dsp_mask << j) & 0x80) {
113 b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
114 dst[x >> 3] &= 0xFF7F>>j;
115 dst[x >> 3] |= b << (7 - j);
116 }
117 if ((mask << j) & 0x80)
118 src_x++;
119 }
120 break;
121 case 2:
122 src_x = 0;
123 for (x = 0; x < width; x++) {
124 int j2 = 2 * (x & 3);
125 j = (x & 7);
126 if ((dsp_mask << j) & 0x80) {
127 b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
128 dst[x >> 2] &= 0xFF3F>>j2;
129 dst[x >> 2] |= b << (6 - j2);
130 }
131 if ((mask << j) & 0x80)
132 src_x++;
133 }
134 break;
135 case 4:
136 src_x = 0;
137 for (x = 0; x < width; x++) {
138 int j2 = 4*(x&1);
139 j = (x & 7);
140 if ((dsp_mask << j) & 0x80) {
141 b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
142 dst[x >> 1] &= 0xFF0F>>j2;
143 dst[x >> 1] |= b << (4 - j2);
144 }
145 if ((mask << j) & 0x80)
146 src_x++;
147 }
148 break;
149 default:
150 bpp = bits_per_pixel >> 3;
151 d = dst;
152 s = src;
153 for (x = 0; x < width; x++) {
154 j = x & 7;
155 if ((dsp_mask << j) & 0x80) {
156 memcpy(d, s, bpp);
157 }
158 d += bpp;
159 if ((mask << j) & 0x80)
160 s += bpp;
161 }
162 break;
163 }
164}
165
166void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
167 int w, int bpp)
168{
169 int i;
170 for (i = 0; i < w; i++) {
171 int a, b, c, p, pa, pb, pc;
172
173 a = dst[i - bpp];
174 b = top[i];
175 c = top[i - bpp];
176
177 p = b - c;
178 pc = a - c;
179
180 pa = abs(p);
181 pb = abs(pc);
182 pc = abs(p + pc);
183
184 if (pa <= pb && pa <= pc)
185 p = a;
186 else if (pb <= pc)
187 p = b;
188 else
189 p = c;
190 dst[i] = p + src[i];
191 }
192}
193
194#define UNROLL1(bpp, op) \
195 { \
196 r = dst[0]; \
197 if (bpp >= 2) \
198 g = dst[1]; \
199 if (bpp >= 3) \
200 b = dst[2]; \
201 if (bpp >= 4) \
202 a = dst[3]; \
203 for (; i <= size - bpp; i += bpp) { \
204 dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
205 if (bpp == 1) \
206 continue; \
207 dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
208 if (bpp == 2) \
209 continue; \
210 dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
211 if (bpp == 3) \
212 continue; \
213 dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
214 } \
215 }
216
217#define UNROLL_FILTER(op) \
218 if (bpp == 1) { \
219 UNROLL1(1, op) \
220 } else if (bpp == 2) { \
221 UNROLL1(2, op) \
222 } else if (bpp == 3) { \
223 UNROLL1(3, op) \
224 } else if (bpp == 4) { \
225 UNROLL1(4, op) \
226 } \
227 for (; i < size; i++) { \
228 dst[i] = op(dst[i - bpp], src[i], last[i]); \
229 }
230
231/* NOTE: 'dst' can be equal to 'last' */
232static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
233 uint8_t *src, uint8_t *last, int size, int bpp)
234{
235 int i, p, r, g, b, a;
236
237 switch (filter_type) {
238 case PNG_FILTER_VALUE_NONE:
239 memcpy(dst, src, size);
240 break;
241 case PNG_FILTER_VALUE_SUB:
242 for (i = 0; i < bpp; i++)
243 dst[i] = src[i];
244 if (bpp == 4) {
245 p = *(int *)dst;
246 for (; i < size; i += bpp) {
247 unsigned s = *(int *)(src + i);
248 p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
249 *(int *)(dst + i) = p;
250 }
251 } else {
252#define OP_SUB(x, s, l) ((x) + (s))
253 UNROLL_FILTER(OP_SUB);
254 }
255 break;
256 case PNG_FILTER_VALUE_UP:
257 dsp->add_bytes_l2(dst, src, last, size);
258 break;
259 case PNG_FILTER_VALUE_AVG:
260 for (i = 0; i < bpp; i++) {
261 p = (last[i] >> 1);
262 dst[i] = p + src[i];
263 }
264#define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
265 UNROLL_FILTER(OP_AVG);
266 break;
267 case PNG_FILTER_VALUE_PAETH:
268 for (i = 0; i < bpp; i++) {
269 p = last[i];
270 dst[i] = p + src[i];
271 }
272 if (bpp > 2 && size > 4) {
273 /* would write off the end of the array if we let it process
274 * the last pixel with bpp=3 */
275 int w = bpp == 4 ? size : size - 3;
f6fa7814
DM		 276 if (w > i) {
277 dsp->add_paeth_prediction(dst + i, src + i, last + i, w - i, bpp);
278 i = w;
279 }
2ba45a60
DM		 280 }
281 ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
282 break;
283 }
284}
285
286/* This used to be called "deloco" in FFmpeg
287 * and is actually an inverse reversible colorspace transformation */
288#define YUV2RGB(NAME, TYPE) \
289static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
290{ \
291 int i; \
292 for (i = 0; i < size; i += 3 + alpha) { \
293 int g = dst [i + 1]; \
294 dst[i + 0] += g; \
295 dst[i + 2] += g; \
296 } \
297}
298
299YUV2RGB(rgb8, uint8_t)
300YUV2RGB(rgb16, uint16_t)
301
302/* process exactly one decompressed row */
303static void png_handle_row(PNGDecContext *s)
304{
305 uint8_t *ptr, *last_row;
306 int got_line;
307
308 if (!s->interlace_type) {
f6fa7814
DM		 309 ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
310 if (s->y == 0)
311 last_row = s->last_row;
312 else
313 last_row = ptr - s->image_linesize;
314
315 png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
316 last_row, s->row_size, s->bpp);
2ba45a60
DM		 317 /* loco lags by 1 row so that it doesn't interfere with top prediction */
318 if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
319 if (s->bit_depth == 16) {
320 deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2,
321 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
322 } else {
323 deloco_rgb8(ptr - s->image_linesize, s->row_size,
324 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
325 }
326 }
327 s->y++;
f6fa7814 328 if (s->y == s->cur_h) {
2ba45a60
DM		 329 s->state |= PNG_ALLIMAGE;
330 if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
331 if (s->bit_depth == 16) {
332 deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
333 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
334 } else {
335 deloco_rgb8(ptr, s->row_size,
336 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
337 }
338 }
339 }
340 } else {
341 got_line = 0;
342 for (;;) {
f6fa7814 343 ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
2ba45a60
DM		 344 if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
345 /* if we already read one row, it is time to stop to
346 * wait for the next one */
347 if (got_line)
348 break;
349 png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
350 s->last_row, s->pass_row_size, s->bpp);
351 FFSWAP(uint8_t *, s->last_row, s->tmp_row);
352 FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
353 got_line = 1;
354 }
355 if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
f6fa7814 356 png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
2ba45a60
DM		 357 s->color_type, s->last_row);
358 }
359 s->y++;
f6fa7814 360 if (s->y == s->cur_h) {
2ba45a60
DM		 361 memset(s->last_row, 0, s->row_size);
362 for (;;) {
363 if (s->pass == NB_PASSES - 1) {
364 s->state |= PNG_ALLIMAGE;
365 goto the_end;
366 } else {
367 s->pass++;
368 s->y = 0;
369 s->pass_row_size = ff_png_pass_row_size(s->pass,
370 s->bits_per_pixel,
f6fa7814 371 s->cur_w);
2ba45a60
DM		 372 s->crow_size = s->pass_row_size + 1;
373 if (s->pass_row_size != 0)
374 break;
375 /* skip pass if empty row */
376 }
377 }
378 }
379 }
380the_end:;
381 }
382}
383
384static int png_decode_idat(PNGDecContext *s, int length)
385{
386 int ret;
387 s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
388 s->zstream.next_in = (unsigned char *)s->gb.buffer;
389 bytestream2_skip(&s->gb, length);
390
391 /* decode one line if possible */
392 while (s->zstream.avail_in > 0) {
393 ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
394 if (ret != Z_OK && ret != Z_STREAM_END) {
395 av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
396 return AVERROR_EXTERNAL;
397 }
398 if (s->zstream.avail_out == 0) {
399 if (!(s->state & PNG_ALLIMAGE)) {
400 png_handle_row(s);
401 }
402 s->zstream.avail_out = s->crow_size;
403 s->zstream.next_out = s->crow_buf;
404 }
405 if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
406 av_log(NULL, AV_LOG_WARNING,
407 "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
408 return 0;
409 }
410 }
411 return 0;
412}
413
414static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
415 const uint8_t *data_end)
416{
417 z_stream zstream;
418 unsigned char *buf;
419 unsigned buf_size;
420 int ret;
421
422 zstream.zalloc = ff_png_zalloc;
423 zstream.zfree = ff_png_zfree;
424 zstream.opaque = NULL;
425 if (inflateInit(&zstream) != Z_OK)
426 return AVERROR_EXTERNAL;
427 zstream.next_in = (unsigned char *)data;
428 zstream.avail_in = data_end - data;
429 av_bprint_init(bp, 0, -1);
430
431 while (zstream.avail_in > 0) {
432 av_bprint_get_buffer(bp, 1, &buf, &buf_size);
433 if (!buf_size) {
434 ret = AVERROR(ENOMEM);
435 goto fail;
436 }
437 zstream.next_out = buf;
438 zstream.avail_out = buf_size;
439 ret = inflate(&zstream, Z_PARTIAL_FLUSH);
440 if (ret != Z_OK && ret != Z_STREAM_END) {
441 ret = AVERROR_EXTERNAL;
442 goto fail;
443 }
444 bp->len += zstream.next_out - buf;
445 if (ret == Z_STREAM_END)
446 break;
447 }
448 inflateEnd(&zstream);
449 bp->str[bp->len] = 0;
450 return 0;
451
452fail:
453 inflateEnd(&zstream);
454 av_bprint_finalize(bp, NULL);
455 return ret;
456}
457
458static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
459{
460 size_t extra = 0, i;
461 uint8_t *out, *q;
462
463 for (i = 0; i < size_in; i++)
464 extra += in[i] >= 0x80;
465 if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
466 return NULL;
467 q = out = av_malloc(size_in + extra + 1);
468 if (!out)
469 return NULL;
470 for (i = 0; i < size_in; i++) {
471 if (in[i] >= 0x80) {
472 *(q++) = 0xC0 | (in[i] >> 6);
473 *(q++) = 0x80 | (in[i] & 0x3F);
474 } else {
475 *(q++) = in[i];
476 }
477 }
478 *(q++) = 0;
479 return out;
480}
481
482static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed,
483 AVDictionary **dict)
484{
485 int ret, method;
486 const uint8_t *data = s->gb.buffer;
487 const uint8_t *data_end = data + length;
488 const uint8_t *keyword = data;
489 const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
490 uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
491 unsigned text_len;
492 AVBPrint bp;
493
494 if (!keyword_end)
495 return AVERROR_INVALIDDATA;
496 data = keyword_end + 1;
497
498 if (compressed) {
499 if (data == data_end)
500 return AVERROR_INVALIDDATA;
501 method = *(data++);
502 if (method)
503 return AVERROR_INVALIDDATA;
504 if ((ret = decode_zbuf(&bp, data, data_end)) < 0)
505 return ret;
506 text_len = bp.len;
507 av_bprint_finalize(&bp, (char **)&text);
508 if (!text)
509 return AVERROR(ENOMEM);
510 } else {
511 text = (uint8_t *)data;
512 text_len = data_end - text;
513 }
514
515 kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
516 txt_utf8 = iso88591_to_utf8(text, text_len);
517 if (text != data)
518 av_free(text);
519 if (!(kw_utf8 && txt_utf8)) {
520 av_free(kw_utf8);
521 av_free(txt_utf8);
522 return AVERROR(ENOMEM);
523 }
524
525 av_dict_set(dict, kw_utf8, txt_utf8,
526 AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
527 return 0;
528}
529
f6fa7814
DM		 530static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s,
531 uint32_t length)
2ba45a60 532{
f6fa7814
DM		 533 if (length != 13)
534 return AVERROR_INVALIDDATA;
2ba45a60 535
f6fa7814
DM		 536 if (s->state & PNG_IDAT) {
537 av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
538 return AVERROR_INVALIDDATA;
539 }
2ba45a60 540
f6fa7814
DM		 541 s->width = s->cur_w = bytestream2_get_be32(&s->gb);
542 s->height = s->cur_h = bytestream2_get_be32(&s->gb);
543 if (av_image_check_size(s->width, s->height, 0, avctx)) {
544 s->width = s->height = 0;
545 av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
546 return AVERROR_INVALIDDATA;
547 }
548 s->bit_depth = bytestream2_get_byte(&s->gb);
549 s->color_type = bytestream2_get_byte(&s->gb);
550 s->compression_type = bytestream2_get_byte(&s->gb);
551 s->filter_type = bytestream2_get_byte(&s->gb);
552 s->interlace_type = bytestream2_get_byte(&s->gb);
553 bytestream2_skip(&s->gb, 4); /* crc */
554 s->state |= PNG_IHDR;
555 if (avctx->debug & FF_DEBUG_PICT_INFO)
556 av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
557 "compression_type=%d filter_type=%d interlace_type=%d\n",
558 s->width, s->height, s->bit_depth, s->color_type,
559 s->compression_type, s->filter_type, s->interlace_type);
2ba45a60 560
f6fa7814
DM		 561 return 0;
562}
563
564static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s)
565{
566 if (s->state & PNG_IDAT) {
567 av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
2ba45a60
DM		 568 return AVERROR_INVALIDDATA;
569 }
f6fa7814
DM		 570 avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb);
571 avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb);
572 if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
573 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
574 bytestream2_skip(&s->gb, 1); /* unit specifier */
575 bytestream2_skip(&s->gb, 4); /* crc */
2ba45a60 576
f6fa7814
DM		 577 return 0;
578}
2ba45a60 579
f6fa7814
DM		 580static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
581 uint32_t length, AVFrame *p)
582{
583 int ret;
584
585 if (!(s->state & PNG_IHDR)) {
586 av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
587 return AVERROR_INVALIDDATA;
2ba45a60 588 }
f6fa7814
DM		 589 if (!(s->state & PNG_IDAT)) {
590 /* init image info */
591 avctx->width = s->width;
592 avctx->height = s->height;
593
594 s->channels = ff_png_get_nb_channels(s->color_type);
595 s->bits_per_pixel = s->bit_depth * s->channels;
596 s->bpp = (s->bits_per_pixel + 7) >> 3;
597 s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
598
599 if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
600 s->color_type == PNG_COLOR_TYPE_RGB) {
601 avctx->pix_fmt = AV_PIX_FMT_RGB24;
602 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
603 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
604 avctx->pix_fmt = AV_PIX_FMT_RGBA;
605 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
606 s->color_type == PNG_COLOR_TYPE_GRAY) {
607 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
608 } else if (s->bit_depth == 16 &&
609 s->color_type == PNG_COLOR_TYPE_GRAY) {
610 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
611 } else if (s->bit_depth == 16 &&
612 s->color_type == PNG_COLOR_TYPE_RGB) {
613 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
614 } else if (s->bit_depth == 16 &&
615 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
616 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
617 } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
618 s->color_type == PNG_COLOR_TYPE_PALETTE) {
619 avctx->pix_fmt = AV_PIX_FMT_PAL8;
620 } else if (s->bit_depth == 1 && s->bits_per_pixel == 1) {
621 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
622 } else if (s->bit_depth == 8 &&
623 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
624 avctx->pix_fmt = AV_PIX_FMT_YA8;
625 } else if (s->bit_depth == 16 &&
626 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
627 avctx->pix_fmt = AV_PIX_FMT_YA16BE;
628 } else {
629 av_log(avctx, AV_LOG_ERROR, "unsupported bit depth %d "
630 "and color type %d\n",
631 s->bit_depth, s->color_type);
632 return AVERROR_INVALIDDATA;
2ba45a60
DM		 633 }
634
f6fa7814
DM		 635 if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
636 return ret;
637 ff_thread_finish_setup(avctx);
638
639 p->pict_type = AV_PICTURE_TYPE_I;
640 p->key_frame = 1;
641 p->interlaced_frame = !!s->interlace_type;
642
643 /* compute the compressed row size */
644 if (!s->interlace_type) {
645 s->crow_size = s->row_size + 1;
646 } else {
647 s->pass = 0;
648 s->pass_row_size = ff_png_pass_row_size(s->pass,
649 s->bits_per_pixel,
650 s->cur_w);
651 s->crow_size = s->pass_row_size + 1;
2ba45a60 652 }
f6fa7814
DM		 653 av_dlog(avctx, "row_size=%d crow_size =%d\n",
654 s->row_size, s->crow_size);
655 s->image_buf = p->data[0];
656 s->image_linesize = p->linesize[0];
657 /* copy the palette if needed */
658 if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
659 memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
660 /* empty row is used if differencing to the first row */
661 av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size);
662 if (!s->last_row)
663 return AVERROR_INVALIDDATA;
664 if (s->interlace_type ||
665 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
666 av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size);
667 if (!s->tmp_row)
668 return AVERROR_INVALIDDATA;
669 }
670 /* compressed row */
671 av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
672 if (!s->buffer)
673 return AVERROR(ENOMEM);
674
675 /* we want crow_buf+1 to be 16-byte aligned */
676 s->crow_buf = s->buffer + 15;
677 s->zstream.avail_out = s->crow_size;
678 s->zstream.next_out = s->crow_buf;
679 }
680 s->state |= PNG_IDAT;
681 if ((ret = png_decode_idat(s, length)) < 0)
682 return ret;
683 bytestream2_skip(&s->gb, 4); /* crc */
2ba45a60 684
f6fa7814
DM		 685 return 0;
686}
2ba45a60 687
f6fa7814
DM		 688static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s,
689 uint32_t length)
690{
691 int n, i, r, g, b;
2ba45a60 692
f6fa7814
DM		 693 if ((length % 3) != 0 || length > 256 * 3)
694 return AVERROR_INVALIDDATA;
695 /* read the palette */
696 n = length / 3;
697 for (i = 0; i < n; i++) {
698 r = bytestream2_get_byte(&s->gb);
699 g = bytestream2_get_byte(&s->gb);
700 b = bytestream2_get_byte(&s->gb);
701 s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
702 }
703 for (; i < 256; i++)
704 s->palette[i] = (0xFFU << 24);
705 s->state |= PNG_PLTE;
706 bytestream2_skip(&s->gb, 4); /* crc */
2ba45a60 707
f6fa7814
DM		 708 return 0;
709}
2ba45a60 710
f6fa7814
DM		 711static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s,
712 uint32_t length)
713{
714 int v, i;
715
716 /* read the transparency. XXX: Only palette mode supported */
717 if (s->color_type != PNG_COLOR_TYPE_PALETTE ||
718 length > 256 ||
719 !(s->state & PNG_PLTE))
720 return AVERROR_INVALIDDATA;
721 for (i = 0; i < length; i++) {
722 v = bytestream2_get_byte(&s->gb);
723 s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
2ba45a60 724 }
f6fa7814
DM		 725 bytestream2_skip(&s->gb, 4); /* crc */
726
727 return 0;
728}
2ba45a60 729
f6fa7814
DM		 730static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
731{
732 if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
2ba45a60
DM		 733 int i, j, k;
734 uint8_t *pd = p->data[0];
735 for (j = 0; j < s->height; j++) {
736 i = s->width / 8;
737 for (k = 7; k >= 1; k--)
738 if ((s->width&7) >= k)
739 pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
740 for (i--; i >= 0; i--) {
741 pd[8*i + 7]= pd[i] & 1;
742 pd[8*i + 6]= (pd[i]>>1) & 1;
743 pd[8*i + 5]= (pd[i]>>2) & 1;
744 pd[8*i + 4]= (pd[i]>>3) & 1;
745 pd[8*i + 3]= (pd[i]>>4) & 1;
746 pd[8*i + 2]= (pd[i]>>5) & 1;
747 pd[8*i + 1]= (pd[i]>>6) & 1;
748 pd[8*i + 0]= pd[i]>>7;
749 }
750 pd += s->image_linesize;
751 }
f6fa7814 752 } else if (s->bits_per_pixel == 2) {
2ba45a60
DM		 753 int i, j;
754 uint8_t *pd = p->data[0];
755 for (j = 0; j < s->height; j++) {
756 i = s->width / 4;
f6fa7814 757 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
2ba45a60
DM		 758 if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
759 if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
760 if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
761 for (i--; i >= 0; i--) {
762 pd[4*i + 3]= pd[i] & 3;
763 pd[4*i + 2]= (pd[i]>>2) & 3;
764 pd[4*i + 1]= (pd[i]>>4) & 3;
765 pd[4*i + 0]= pd[i]>>6;
766 }
767 } else {
768 if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
769 if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
770 if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
771 for (i--; i >= 0; i--) {
772 pd[4*i + 3]= ( pd[i] & 3)*0x55;
773 pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
774 pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
775 pd[4*i + 0]= ( pd[i]>>6 )*0x55;
776 }
777 }
778 pd += s->image_linesize;
779 }
f6fa7814 780 } else if (s->bits_per_pixel == 4) {
2ba45a60
DM		 781 int i, j;
782 uint8_t *pd = p->data[0];
783 for (j = 0; j < s->height; j++) {
784 i = s->width/2;
f6fa7814 785 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
2ba45a60
DM		 786 if (s->width&1) pd[2*i+0]= pd[i]>>4;
787 for (i--; i >= 0; i--) {
f6fa7814
DM		 788 pd[2*i + 1] = pd[i] & 15;
789 pd[2*i + 0] = pd[i] >> 4;
790 }
2ba45a60
DM		 791 } else {
792 if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
793 for (i--; i >= 0; i--) {
794 pd[2*i + 1] = (pd[i] & 15) * 0x11;
795 pd[2*i + 0] = (pd[i] >> 4) * 0x11;
796 }
797 }
798 pd += s->image_linesize;
799 }
800 }
f6fa7814
DM		 801}
802
803static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
804 uint32_t length)
805{
806 uint32_t sequence_number;
807
808 if (length != 26)
809 return AVERROR_INVALIDDATA;
810
811 sequence_number = bytestream2_get_be32(&s->gb);
812 s->cur_w = bytestream2_get_be32(&s->gb);
813 s->cur_h = bytestream2_get_be32(&s->gb);
814 s->x_offset = bytestream2_get_be32(&s->gb);
815 s->y_offset = bytestream2_get_be32(&s->gb);
816 bytestream2_skip(&s->gb, 4); /* delay_num (2), delay_den (2) */
817 s->dispose_op = bytestream2_get_byte(&s->gb);
818 s->blend_op = bytestream2_get_byte(&s->gb);
819 bytestream2_skip(&s->gb, 4); /* crc */
820
821 if (sequence_number == 0 &&
822 (s->cur_w != s->width ||
823 s->cur_h != s->height ||
824 s->x_offset != 0 ||
825 s->y_offset != 0) ||
826 s->cur_w <= 0 || s->cur_h <= 0 ||
827 s->x_offset < 0 || s->y_offset < 0 ||
828 s->cur_w > s->width - s->x_offset|| s->cur_h > s->height - s->y_offset)
829 return AVERROR_INVALIDDATA;
830
831 /* always (re)start with a clean frame */
832 if (sequence_number == 0) {
833 s->dispose_op = APNG_DISPOSE_OP_BACKGROUND;
834 s->frame_id = 0;
835 } else {
836 s->frame_id++;
837 if (s->frame_id == 1 && s->dispose_op == APNG_DISPOSE_OP_PREVIOUS)
838 /* previous for the second frame is the first frame */
839 s->dispose_op = APNG_DISPOSE_OP_NONE;
840 }
841
842 return 0;
843}
844
845static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
846{
847 int i, j;
848 uint8_t *pd = p->data[0];
849 uint8_t *pd_last = s->last_picture.f->data[0];
850 int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
851
852 ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
853 for (j = 0; j < s->height; j++) {
854 for (i = 0; i < ls; i++)
855 pd[i] += pd_last[i];
856 pd += s->image_linesize;
857 pd_last += s->image_linesize;
858 }
859}
860
861// divide by 255 and round to nearest
862// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
863#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
864
865static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s,
866 AVFrame *p)
867{
868 int i, j;
869 uint8_t *pd = p->data[0];
870 uint8_t *pd_last = s->last_picture.f->data[0];
871 uint8_t *pd_last_region = s->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
872 s->previous_picture.f->data[0] : s->last_picture.f->data[0];
873 int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
874
875 if (s->blend_op == APNG_BLEND_OP_OVER &&
876 avctx->pix_fmt != AV_PIX_FMT_RGBA && avctx->pix_fmt != AV_PIX_FMT_ARGB) {
877 avpriv_request_sample(avctx, "Blending with pixel format %s",
878 av_get_pix_fmt_name(avctx->pix_fmt));
879 return AVERROR_PATCHWELCOME;
880 }
881
882 ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
883 if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS)
884 ff_thread_await_progress(&s->previous_picture, INT_MAX, 0);
885
886 for (j = 0; j < s->y_offset; j++) {
887 for (i = 0; i < ls; i++)
888 pd[i] = pd_last[i];
889 pd += s->image_linesize;
890 pd_last += s->image_linesize;
891 }
892
893 if (s->dispose_op != APNG_DISPOSE_OP_BACKGROUND && s->blend_op == APNG_BLEND_OP_OVER) {
894 uint8_t ri, gi, bi, ai;
895
896 pd_last_region += s->y_offset * s->image_linesize;
897 if (avctx->pix_fmt == AV_PIX_FMT_RGBA) {
898 ri = 0;
899 gi = 1;
900 bi = 2;
901 ai = 3;
902 } else {
903 ri = 3;
904 gi = 2;
905 bi = 1;
906 ai = 0;
907 }
908
909 for (j = s->y_offset; j < s->y_offset + s->cur_h; j++) {
910 for (i = 0; i < s->x_offset * s->bpp; i++)
911 pd[i] = pd_last[i];
912 for (; i < (s->x_offset + s->cur_w) * s->bpp; i += s->bpp) {
913 uint8_t alpha = pd[i+ai];
914
915 /* output = alpha * foreground + (1-alpha) * background */
916 switch (alpha) {
917 case 0:
918 pd[i+ri] = pd_last_region[i+ri];
919 pd[i+gi] = pd_last_region[i+gi];
920 pd[i+bi] = pd_last_region[i+bi];
921 pd[i+ai] = 0xff;
922 break;
923 case 255:
924 break;
925 default:
926 pd[i+ri] = FAST_DIV255(alpha * pd[i+ri] + (255 - alpha) * pd_last_region[i+ri]);
927 pd[i+gi] = FAST_DIV255(alpha * pd[i+gi] + (255 - alpha) * pd_last_region[i+gi]);
928 pd[i+bi] = FAST_DIV255(alpha * pd[i+bi] + (255 - alpha) * pd_last_region[i+bi]);
929 pd[i+ai] = 0xff;
930 break;
931 }
932 }
933 for (; i < ls; i++)
934 pd[i] = pd_last[i];
935 pd += s->image_linesize;
936 pd_last += s->image_linesize;
937 pd_last_region += s->image_linesize;
938 }
939 } else {
940 for (j = s->y_offset; j < s->y_offset + s->cur_h; j++) {
941 for (i = 0; i < s->x_offset * s->bpp; i++)
942 pd[i] = pd_last[i];
943 for (i = (s->x_offset + s->cur_w) * s->bpp; i < ls; i++)
944 pd[i] = pd_last[i];
945 pd += s->image_linesize;
946 pd_last += s->image_linesize;
947 }
948 }
949
950 for (j = s->y_offset + s->cur_h; j < s->height; j++) {
951 for (i = 0; i < ls; i++)
952 pd[i] = pd_last[i];
953 pd += s->image_linesize;
954 pd_last += s->image_linesize;
955 }
956
957 return 0;
958}
959
960static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
961 AVFrame *p, AVPacket *avpkt)
962{
963 AVDictionary *metadata = NULL;
964 uint32_t tag, length;
965 int decode_next_dat = 0;
966 int ret = AVERROR_INVALIDDATA;
967 AVFrame *ref;
968
969 for (;;) {
970 length = bytestream2_get_bytes_left(&s->gb);
971 if (length <= 0) {
972 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
973 if (!(s->state & PNG_IDAT))
974 return 0;
975 else
976 goto exit_loop;
977 }
978 av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
979 if ( s->state & PNG_ALLIMAGE
980 && avctx->strict_std_compliance <= FF_COMPLIANCE_NORMAL)
981 goto exit_loop;
982 goto fail;
983 }
984
985 length = bytestream2_get_be32(&s->gb);
986 if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) {
987 av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
988 goto fail;
989 }
990 tag = bytestream2_get_le32(&s->gb);
991 if (avctx->debug & FF_DEBUG_STARTCODE)
992 av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n",
993 (tag & 0xff),
994 ((tag >> 8) & 0xff),
995 ((tag >> 16) & 0xff),
996 ((tag >> 24) & 0xff), length);
997 switch (tag) {
998 case MKTAG('I', 'H', 'D', 'R'):
999 if (decode_ihdr_chunk(avctx, s, length) < 0)
1000 goto fail;
1001 break;
1002 case MKTAG('p', 'H', 'Y', 's'):
1003 if (decode_phys_chunk(avctx, s) < 0)
1004 goto fail;
1005 break;
1006 case MKTAG('f', 'c', 'T', 'L'):
1007 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1008 goto skip_tag;
1009 if ((ret = decode_fctl_chunk(avctx, s, length)) < 0)
1010 goto fail;
1011 decode_next_dat = 1;
1012 break;
1013 case MKTAG('f', 'd', 'A', 'T'):
1014 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1015 goto skip_tag;
1016 if (!decode_next_dat)
1017 goto fail;
1018 bytestream2_get_be32(&s->gb);
1019 length -= 4;
1020 /* fallthrough */
1021 case MKTAG('I', 'D', 'A', 'T'):
1022 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1023 goto skip_tag;
1024 if (decode_idat_chunk(avctx, s, length, p) < 0)
1025 goto fail;
1026 break;
1027 case MKTAG('P', 'L', 'T', 'E'):
1028 if (decode_plte_chunk(avctx, s, length) < 0)
1029 goto skip_tag;
1030 break;
1031 case MKTAG('t', 'R', 'N', 'S'):
1032 if (decode_trns_chunk(avctx, s, length) < 0)
1033 goto skip_tag;
1034 break;
1035 case MKTAG('t', 'E', 'X', 't'):
1036 if (decode_text_chunk(s, length, 0, &metadata) < 0)
1037 av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1038 bytestream2_skip(&s->gb, length + 4);
1039 break;
1040 case MKTAG('z', 'T', 'X', 't'):
1041 if (decode_text_chunk(s, length, 1, &metadata) < 0)
1042 av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1043 bytestream2_skip(&s->gb, length + 4);
1044 break;
1045 case MKTAG('I', 'E', 'N', 'D'):
1046 if (!(s->state & PNG_ALLIMAGE))
1047 av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1048 if (!(s->state & (PNG_ALLIMAGE|PNG_IDAT))) {
1049 goto fail;
1050 }
1051 bytestream2_skip(&s->gb, 4); /* crc */
1052 goto exit_loop;
1053 default:
1054 /* skip tag */
1055skip_tag:
1056 bytestream2_skip(&s->gb, length + 4);
1057 break;
1058 }
1059 }
1060exit_loop:
1061
1062 if (s->bits_per_pixel <= 4)
1063 handle_small_bpp(s, p);
2ba45a60
DM		 1064
1065 /* handle p-frames only if a predecessor frame is available */
f6fa7814
DM		 1066 ref = s->dispose_op == APNG_DISPOSE_OP_PREVIOUS ?
1067 s->previous_picture.f : s->last_picture.f;
1068 if (ref->data[0]) {
2ba45a60 1069 if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG")
f6fa7814
DM		 1070 && ref->width == p->width
1071 && ref->height== p->height
1072 && ref->format== p->format
2ba45a60 1073 ) {
f6fa7814
DM		 1074 if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG)
1075 handle_p_frame_png(s, p);
1076 else if (CONFIG_APNG_DECODER &&
1077 avctx->codec_id == AV_CODEC_ID_APNG &&
1078 (ret = handle_p_frame_apng(avctx, s, p)) < 0)
1079 goto fail;
2ba45a60
DM		 1080 }
1081 }
1082 ff_thread_report_progress(&s->picture, INT_MAX, 0);
1083
1084 av_frame_set_metadata(p, metadata);
1085 metadata = NULL;
f6fa7814
DM		 1086 return 0;
1087
1088fail:
1089 av_dict_free(&metadata);
1090 ff_thread_report_progress(&s->picture, INT_MAX, 0);
1091 return ret;
1092}
1093
1094#if CONFIG_PNG_DECODER
1095static int decode_frame_png(AVCodecContext *avctx,
1096 void *data, int *got_frame,
1097 AVPacket *avpkt)
1098{
1099 PNGDecContext *const s = avctx->priv_data;
1100 const uint8_t *buf = avpkt->data;
1101 int buf_size = avpkt->size;
1102 AVFrame *p;
1103 int64_t sig;
1104 int ret;
1105
1106 ff_thread_release_buffer(avctx, &s->last_picture);
1107 FFSWAP(ThreadFrame, s->picture, s->last_picture);
1108 p = s->picture.f;
1109
1110 bytestream2_init(&s->gb, buf, buf_size);
1111
1112 /* check signature */
1113 sig = bytestream2_get_be64(&s->gb);
1114 if (sig != PNGSIG &&
1115 sig != MNGSIG) {
1116 av_log(avctx, AV_LOG_ERROR, "Missing png signature\n");
1117 return AVERROR_INVALIDDATA;
1118 }
1119
1120 s->y = s->state = 0;
1121
1122 /* init the zlib */
1123 s->zstream.zalloc = ff_png_zalloc;
1124 s->zstream.zfree = ff_png_zfree;
1125 s->zstream.opaque = NULL;
1126 ret = inflateInit(&s->zstream);
1127 if (ret != Z_OK) {
1128 av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1129 return AVERROR_EXTERNAL;
1130 }
1131
1132 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1133 goto the_end;
2ba45a60
DM		 1134
1135 if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1136 return ret;
1137
1138 *got_frame = 1;
1139
1140 ret = bytestream2_tell(&s->gb);
1141the_end:
1142 inflateEnd(&s->zstream);
1143 s->crow_buf = NULL;
1144 return ret;
2ba45a60 1145}
f6fa7814
DM		 1146#endif
1147
1148#if CONFIG_APNG_DECODER
1149static int decode_frame_apng(AVCodecContext *avctx,
1150 void *data, int *got_frame,
1151 AVPacket *avpkt)
1152{
1153 PNGDecContext *const s = avctx->priv_data;
1154 int ret;
1155 AVFrame *p;
1156 ThreadFrame tmp;
1157
1158 ff_thread_release_buffer(avctx, &s->previous_picture);
1159 tmp = s->previous_picture;
1160 s->previous_picture = s->last_picture;
1161 s->last_picture = s->picture;
1162 s->picture = tmp;
1163 p = s->picture.f;
1164
1165 if (!(s->state & PNG_IHDR)) {
1166 if (!avctx->extradata_size)
1167 return AVERROR_INVALIDDATA;
1168
1169 /* only init fields, there is no zlib use in extradata */
1170 s->zstream.zalloc = ff_png_zalloc;
1171 s->zstream.zfree = ff_png_zfree;
1172
1173 bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1174 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1175 goto end;
1176 }
1177
1178 /* reset state for a new frame */
1179 if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1180 av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1181 ret = AVERROR_EXTERNAL;
1182 goto end;
1183 }
1184 s->y = 0;
1185 s->state &= ~(PNG_IDAT | PNG_ALLIMAGE);
1186 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1187 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1188 goto end;
1189
1190 if (!(s->state & PNG_ALLIMAGE))
1191 av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1192 if (!(s->state & (PNG_ALLIMAGE|PNG_IDAT))) {
1193 ret = AVERROR_INVALIDDATA;
1194 goto end;
1195 }
1196 if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1197 goto end;
1198
1199 *got_frame = 1;
1200 ret = bytestream2_tell(&s->gb);
1201
1202end:
1203 inflateEnd(&s->zstream);
1204 return ret;
1205}
1206#endif
2ba45a60
DM		 1207
1208static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1209{
1210 PNGDecContext *psrc = src->priv_data;
1211 PNGDecContext *pdst = dst->priv_data;
f6fa7814 1212 int ret;
2ba45a60
DM		 1213
1214 if (dst == src)
1215 return 0;
1216
f6fa7814
DM		 1217 pdst->frame_id = psrc->frame_id;
1218
2ba45a60 1219 ff_thread_release_buffer(dst, &pdst->picture);
f6fa7814
DM		 1220 if (psrc->picture.f->data[0] &&
1221 (ret = ff_thread_ref_frame(&pdst->picture, &psrc->picture)) < 0)
1222 return ret;
1223 if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1224 ff_thread_release_buffer(dst, &pdst->last_picture);
1225 if (psrc->last_picture.f->data[0])
1226 return ff_thread_ref_frame(&pdst->last_picture, &psrc->last_picture);
1227 }
2ba45a60
DM		 1228
1229 return 0;
1230}
1231
1232static av_cold int png_dec_init(AVCodecContext *avctx)
1233{
1234 PNGDecContext *s = avctx->priv_data;
1235
1236 s->avctx = avctx;
f6fa7814 1237 s->previous_picture.f = av_frame_alloc();
2ba45a60
DM		 1238 s->last_picture.f = av_frame_alloc();
1239 s->picture.f = av_frame_alloc();
f6fa7814
DM		 1240 if (!s->previous_picture.f || !s->last_picture.f || !s->picture.f) {
1241 av_frame_free(&s->previous_picture.f);
1242 av_frame_free(&s->last_picture.f);
1243 av_frame_free(&s->picture.f);
2ba45a60 1244 return AVERROR(ENOMEM);
f6fa7814 1245 }
2ba45a60
DM		 1246
1247 if (!avctx->internal->is_copy) {
1248 avctx->internal->allocate_progress = 1;
1249 ff_pngdsp_init(&s->dsp);
1250 }
1251
1252 return 0;
1253}
1254
1255static av_cold int png_dec_end(AVCodecContext *avctx)
1256{
1257 PNGDecContext *s = avctx->priv_data;
1258
f6fa7814
DM		 1259 ff_thread_release_buffer(avctx, &s->previous_picture);
1260 av_frame_free(&s->previous_picture.f);
2ba45a60
DM		 1261 ff_thread_release_buffer(avctx, &s->last_picture);
1262 av_frame_free(&s->last_picture.f);
1263 ff_thread_release_buffer(avctx, &s->picture);
1264 av_frame_free(&s->picture.f);
1265 av_freep(&s->buffer);
1266 s->buffer_size = 0;
1267 av_freep(&s->last_row);
1268 s->last_row_size = 0;
1269 av_freep(&s->tmp_row);
1270 s->tmp_row_size = 0;
1271
1272 return 0;
1273}
1274
f6fa7814
DM		 1275#if CONFIG_APNG_DECODER
1276AVCodec ff_apng_decoder = {
1277 .name = "apng",
1278 .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1279 .type = AVMEDIA_TYPE_VIDEO,
1280 .id = AV_CODEC_ID_APNG,
1281 .priv_data_size = sizeof(PNGDecContext),
1282 .init = png_dec_init,
1283 .close = png_dec_end,
1284 .decode = decode_frame_apng,
1285 .init_thread_copy = ONLY_IF_THREADS_ENABLED(png_dec_init),
1286 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1287 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
1288};
1289#endif
1290
1291#if CONFIG_PNG_DECODER
2ba45a60
DM		 1292AVCodec ff_png_decoder = {
1293 .name = "png",
1294 .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1295 .type = AVMEDIA_TYPE_VIDEO,
1296 .id = AV_CODEC_ID_PNG,
1297 .priv_data_size = sizeof(PNGDecContext),
1298 .init = png_dec_init,
1299 .close = png_dec_end,
f6fa7814 1300 .decode = decode_frame_png,
2ba45a60
DM		 1301 .init_thread_copy = ONLY_IF_THREADS_ENABLED(png_dec_init),
1302 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1303 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
1304};
f6fa7814 1305#endif
ffmpeg Piment Noir Debian package repository