3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/avassert.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/crc.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/stereo3d.h"
30 #include "libavutil/mastering_display_metadata.h"
33 #include "bytestream.h"
49 PNG_ALLIMAGE = 1 << 1,
52 typedef struct PNGDecContext {
54 AVCodecContext *avctx;
57 ThreadFrame last_picture;
60 enum PNGHeaderState hdr_state;
61 enum PNGImageState pic_state;
65 int x_offset, y_offset;
66 int last_x_offset, last_y_offset;
67 uint8_t dispose_op, blend_op;
68 uint8_t last_dispose_op;
78 uint8_t transparent_color_be[6];
82 uint32_t palette[256];
85 unsigned int last_row_size;
87 unsigned int tmp_row_size;
91 int crow_size; /* compressed row size (include filter type) */
92 int row_size; /* decompressed row size */
93 int pass_row_size; /* decompress row size of the current pass */
98 /* Mask to determine which pixels are valid in a pass */
99 static const uint8_t png_pass_mask[NB_PASSES] = {
100 0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff,
103 /* Mask to determine which y pixels can be written in a pass */
104 static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
105 0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
108 /* Mask to determine which pixels to overwrite while displaying */
109 static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
110 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
113 /* NOTE: we try to construct a good looking image at each pass. width
114 * is the original image width. We also do pixel format conversion at
116 static void png_put_interlaced_row(uint8_t *dst, int width,
117 int bits_per_pixel, int pass,
118 int color_type, const uint8_t *src)
120 int x, mask, dsp_mask, j, src_x, b, bpp;
124 mask = png_pass_mask[pass];
125 dsp_mask = png_pass_dsp_mask[pass];
127 switch (bits_per_pixel) {
130 for (x = 0; x < width; x++) {
132 if ((dsp_mask << j) & 0x80) {
133 b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
134 dst[x >> 3] &= 0xFF7F>>j;
135 dst[x >> 3] |= b << (7 - j);
137 if ((mask << j) & 0x80)
143 for (x = 0; x < width; x++) {
144 int j2 = 2 * (x & 3);
146 if ((dsp_mask << j) & 0x80) {
147 b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3;
148 dst[x >> 2] &= 0xFF3F>>j2;
149 dst[x >> 2] |= b << (6 - j2);
151 if ((mask << j) & 0x80)
157 for (x = 0; x < width; x++) {
160 if ((dsp_mask << j) & 0x80) {
161 b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15;
162 dst[x >> 1] &= 0xFF0F>>j2;
163 dst[x >> 1] |= b << (4 - j2);
165 if ((mask << j) & 0x80)
170 bpp = bits_per_pixel >> 3;
173 for (x = 0; x < width; x++) {
175 if ((dsp_mask << j) & 0x80) {
179 if ((mask << j) & 0x80)
186 void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
190 for (i = 0; i < w; i++) {
191 int a, b, c, p, pa, pb, pc;
204 if (pa <= pb && pa <= pc)
214 #define UNROLL1(bpp, op) \
223 for (; i <= size - bpp; i += bpp) { \
224 dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
227 dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
230 dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
233 dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
237 #define UNROLL_FILTER(op) \
240 } else if (bpp == 2) { \
242 } else if (bpp == 3) { \
244 } else if (bpp == 4) { \
247 for (; i < size; i++) { \
248 dst[i] = op(dst[i - bpp], src[i], last[i]); \
251 /* NOTE: 'dst' can be equal to 'last' */
252 void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
253 uint8_t *src, uint8_t *last, int size, int bpp)
255 int i, p, r, g, b, a;
257 switch (filter_type) {
258 case PNG_FILTER_VALUE_NONE:
259 memcpy(dst, src, size);
261 case PNG_FILTER_VALUE_SUB:
262 for (i = 0; i < bpp; i++)
266 for (; i < size; i += bpp) {
267 unsigned s = *(int *)(src + i);
268 p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
269 *(int *)(dst + i) = p;
272 #define OP_SUB(x, s, l) ((x) + (s))
273 UNROLL_FILTER(OP_SUB);
276 case PNG_FILTER_VALUE_UP:
277 dsp->add_bytes_l2(dst, src, last, size);
279 case PNG_FILTER_VALUE_AVG:
280 for (i = 0; i < bpp; i++) {
284 #define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff)
285 UNROLL_FILTER(OP_AVG);
287 case PNG_FILTER_VALUE_PAETH:
288 for (i = 0; i < bpp; i++) {
292 if (bpp > 2 && size > 4) {
293 /* would write off the end of the array if we let it process
294 * the last pixel with bpp=3 */
295 int w = (bpp & 3) ? size - 3 : size;
298 dsp->add_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
302 ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
307 /* This used to be called "deloco" in FFmpeg
308 * and is actually an inverse reversible colorspace transformation */
309 #define YUV2RGB(NAME, TYPE) \
310 static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
313 for (i = 0; i < size; i += 3 + alpha) { \
314 int g = dst [i + 1]; \
320 YUV2RGB(rgb8, uint8_t)
321 YUV2RGB(rgb16, uint16_t)
323 static int percent_missing(PNGDecContext *s)
325 if (s->interlace_type) {
326 return 100 - 100 * s->pass / (NB_PASSES - 1);
328 return 100 - 100 * s->y / s->cur_h;
332 /* process exactly one decompressed row */
333 static void png_handle_row(PNGDecContext *s)
335 uint8_t *ptr, *last_row;
338 if (!s->interlace_type) {
339 ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
341 last_row = s->last_row;
343 last_row = ptr - s->image_linesize;
345 ff_png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
346 last_row, s->row_size, s->bpp);
347 /* loco lags by 1 row so that it doesn't interfere with top prediction */
348 if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
349 if (s->bit_depth == 16) {
350 deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2,
351 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
353 deloco_rgb8(ptr - s->image_linesize, s->row_size,
354 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
358 if (s->y == s->cur_h) {
359 s->pic_state |= PNG_ALLIMAGE;
360 if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
361 if (s->bit_depth == 16) {
362 deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
363 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
365 deloco_rgb8(ptr, s->row_size,
366 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
373 ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp;
374 if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
375 /* if we already read one row, it is time to stop to
376 * wait for the next one */
379 ff_png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
380 s->last_row, s->pass_row_size, s->bpp);
381 FFSWAP(uint8_t *, s->last_row, s->tmp_row);
382 FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size);
385 if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
386 png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass,
387 s->color_type, s->last_row);
390 if (s->y == s->cur_h) {
391 memset(s->last_row, 0, s->row_size);
393 if (s->pass == NB_PASSES - 1) {
394 s->pic_state |= PNG_ALLIMAGE;
399 s->pass_row_size = ff_png_pass_row_size(s->pass,
402 s->crow_size = s->pass_row_size + 1;
403 if (s->pass_row_size != 0)
405 /* skip pass if empty row */
414 static int png_decode_idat(PNGDecContext *s, int length)
417 s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
418 s->zstream.next_in = s->gb.buffer;
419 bytestream2_skip(&s->gb, length);
421 /* decode one line if possible */
422 while (s->zstream.avail_in > 0) {
423 ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
424 if (ret != Z_OK && ret != Z_STREAM_END) {
425 av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
426 return AVERROR_EXTERNAL;
428 if (s->zstream.avail_out == 0) {
429 if (!(s->pic_state & PNG_ALLIMAGE)) {
432 s->zstream.avail_out = s->crow_size;
433 s->zstream.next_out = s->crow_buf;
435 if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
436 av_log(s->avctx, AV_LOG_WARNING,
437 "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
444 static int decode_zbuf(AVBPrint *bp, const uint8_t *data,
445 const uint8_t *data_end)
452 zstream.zalloc = ff_png_zalloc;
453 zstream.zfree = ff_png_zfree;
454 zstream.opaque = NULL;
455 if (inflateInit(&zstream) != Z_OK)
456 return AVERROR_EXTERNAL;
457 zstream.next_in = data;
458 zstream.avail_in = data_end - data;
459 av_bprint_init(bp, 0, AV_BPRINT_SIZE_UNLIMITED);
461 while (zstream.avail_in > 0) {
462 av_bprint_get_buffer(bp, 2, &buf, &buf_size);
464 ret = AVERROR(ENOMEM);
467 zstream.next_out = buf;
468 zstream.avail_out = buf_size - 1;
469 ret = inflate(&zstream, Z_PARTIAL_FLUSH);
470 if (ret != Z_OK && ret != Z_STREAM_END) {
471 ret = AVERROR_EXTERNAL;
474 bp->len += zstream.next_out - buf;
475 if (ret == Z_STREAM_END)
478 inflateEnd(&zstream);
479 bp->str[bp->len] = 0;
483 inflateEnd(&zstream);
484 av_bprint_finalize(bp, NULL);
488 static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in)
493 for (i = 0; i < size_in; i++)
494 extra += in[i] >= 0x80;
495 if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1)
497 q = out = av_malloc(size_in + extra + 1);
500 for (i = 0; i < size_in; i++) {
502 *(q++) = 0xC0 | (in[i] >> 6);
503 *(q++) = 0x80 | (in[i] & 0x3F);
512 static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed,
516 const uint8_t *data = s->gb.buffer;
517 const uint8_t *data_end = data + length;
518 const uint8_t *keyword = data;
519 const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword);
520 uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL;
525 return AVERROR_INVALIDDATA;
526 data = keyword_end + 1;
529 if (data == data_end)
530 return AVERROR_INVALIDDATA;
533 return AVERROR_INVALIDDATA;
534 if ((ret = decode_zbuf(&bp, data, data_end)) < 0)
537 ret = av_bprint_finalize(&bp, (char **)&text);
541 text = (uint8_t *)data;
542 text_len = data_end - text;
545 kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword);
546 txt_utf8 = iso88591_to_utf8(text, text_len);
549 if (!(kw_utf8 && txt_utf8)) {
552 return AVERROR(ENOMEM);
555 av_dict_set(dict, kw_utf8, txt_utf8,
556 AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
560 static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s,
564 return AVERROR_INVALIDDATA;
566 if (s->pic_state & PNG_IDAT) {
567 av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
568 return AVERROR_INVALIDDATA;
571 if (s->hdr_state & PNG_IHDR) {
572 av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n");
573 return AVERROR_INVALIDDATA;
576 s->width = s->cur_w = bytestream2_get_be32(&s->gb);
577 s->height = s->cur_h = bytestream2_get_be32(&s->gb);
578 if (av_image_check_size(s->width, s->height, 0, avctx)) {
579 s->cur_w = s->cur_h = s->width = s->height = 0;
580 av_log(avctx, AV_LOG_ERROR, "Invalid image size\n");
581 return AVERROR_INVALIDDATA;
583 s->bit_depth = bytestream2_get_byte(&s->gb);
584 if (s->bit_depth != 1 && s->bit_depth != 2 && s->bit_depth != 4 &&
585 s->bit_depth != 8 && s->bit_depth != 16) {
586 av_log(avctx, AV_LOG_ERROR, "Invalid bit depth\n");
589 s->color_type = bytestream2_get_byte(&s->gb);
590 s->compression_type = bytestream2_get_byte(&s->gb);
591 if (s->compression_type) {
592 av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n", s->compression_type);
595 s->filter_type = bytestream2_get_byte(&s->gb);
596 s->interlace_type = bytestream2_get_byte(&s->gb);
597 bytestream2_skip(&s->gb, 4); /* crc */
598 s->hdr_state |= PNG_IHDR;
599 if (avctx->debug & FF_DEBUG_PICT_INFO)
600 av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d "
601 "compression_type=%d filter_type=%d interlace_type=%d\n",
602 s->width, s->height, s->bit_depth, s->color_type,
603 s->compression_type, s->filter_type, s->interlace_type);
607 s->cur_w = s->cur_h = s->width = s->height = 0;
609 return AVERROR_INVALIDDATA;
612 static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s)
614 if (s->pic_state & PNG_IDAT) {
615 av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
616 return AVERROR_INVALIDDATA;
618 avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb);
619 avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb);
620 if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
621 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
622 bytestream2_skip(&s->gb, 1); /* unit specifier */
623 bytestream2_skip(&s->gb, 4); /* crc */
628 static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
629 uint32_t length, AVFrame *p)
632 size_t byte_depth = s->bit_depth > 8 ? 2 : 1;
634 if (!(s->hdr_state & PNG_IHDR)) {
635 av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");
636 return AVERROR_INVALIDDATA;
638 if (!(s->pic_state & PNG_IDAT)) {
639 /* init image info */
640 ret = ff_set_dimensions(avctx, s->width, s->height);
644 s->channels = ff_png_get_nb_channels(s->color_type);
645 s->bits_per_pixel = s->bit_depth * s->channels;
646 s->bpp = (s->bits_per_pixel + 7) >> 3;
647 s->row_size = (s->cur_w * s->bits_per_pixel + 7) >> 3;
649 if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
650 s->color_type == PNG_COLOR_TYPE_RGB) {
651 avctx->pix_fmt = AV_PIX_FMT_RGB24;
652 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
653 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
654 avctx->pix_fmt = AV_PIX_FMT_RGBA;
655 } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
656 s->color_type == PNG_COLOR_TYPE_GRAY) {
657 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
658 } else if (s->bit_depth == 16 &&
659 s->color_type == PNG_COLOR_TYPE_GRAY) {
660 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
661 } else if (s->bit_depth == 16 &&
662 s->color_type == PNG_COLOR_TYPE_RGB) {
663 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
664 } else if (s->bit_depth == 16 &&
665 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
666 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
667 } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
668 s->color_type == PNG_COLOR_TYPE_PALETTE) {
669 avctx->pix_fmt = AV_PIX_FMT_PAL8;
670 } else if (s->bit_depth == 1 && s->bits_per_pixel == 1 && avctx->codec_id != AV_CODEC_ID_APNG) {
671 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
672 } else if (s->bit_depth == 8 &&
673 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
674 avctx->pix_fmt = AV_PIX_FMT_YA8;
675 } else if (s->bit_depth == 16 &&
676 s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
677 avctx->pix_fmt = AV_PIX_FMT_YA16BE;
679 avpriv_report_missing_feature(avctx,
680 "Bit depth %d color type %d",
681 s->bit_depth, s->color_type);
682 return AVERROR_PATCHWELCOME;
685 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE) {
686 switch (avctx->pix_fmt) {
687 case AV_PIX_FMT_RGB24:
688 avctx->pix_fmt = AV_PIX_FMT_RGBA;
691 case AV_PIX_FMT_RGB48BE:
692 avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
695 case AV_PIX_FMT_GRAY8:
696 avctx->pix_fmt = AV_PIX_FMT_YA8;
699 case AV_PIX_FMT_GRAY16BE:
700 avctx->pix_fmt = AV_PIX_FMT_YA16BE;
704 avpriv_request_sample(avctx, "bit depth %d "
705 "and color type %d with TRNS",
706 s->bit_depth, s->color_type);
707 return AVERROR_INVALIDDATA;
710 s->bpp += byte_depth;
713 ff_thread_release_buffer(avctx, &s->picture);
714 if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
717 p->pict_type = AV_PICTURE_TYPE_I;
719 p->interlaced_frame = !!s->interlace_type;
721 ff_thread_finish_setup(avctx);
723 /* compute the compressed row size */
724 if (!s->interlace_type) {
725 s->crow_size = s->row_size + 1;
728 s->pass_row_size = ff_png_pass_row_size(s->pass,
731 s->crow_size = s->pass_row_size + 1;
733 ff_dlog(avctx, "row_size=%d crow_size =%d\n",
734 s->row_size, s->crow_size);
735 s->image_buf = p->data[0];
736 s->image_linesize = p->linesize[0];
737 /* copy the palette if needed */
738 if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
739 memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
740 /* empty row is used if differencing to the first row */
741 av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size);
743 return AVERROR_INVALIDDATA;
744 if (s->interlace_type ||
745 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
746 av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size);
748 return AVERROR_INVALIDDATA;
751 av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
753 return AVERROR(ENOMEM);
755 /* we want crow_buf+1 to be 16-byte aligned */
756 s->crow_buf = s->buffer + 15;
757 s->zstream.avail_out = s->crow_size;
758 s->zstream.next_out = s->crow_buf;
761 s->pic_state |= PNG_IDAT;
763 /* set image to non-transparent bpp while decompressing */
764 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
765 s->bpp -= byte_depth;
767 ret = png_decode_idat(s, length);
769 if (s->has_trns && s->color_type != PNG_COLOR_TYPE_PALETTE)
770 s->bpp += byte_depth;
775 bytestream2_skip(&s->gb, 4); /* crc */
780 static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s,
785 if ((length % 3) != 0 || length > 256 * 3)
786 return AVERROR_INVALIDDATA;
787 /* read the palette */
789 for (i = 0; i < n; i++) {
790 r = bytestream2_get_byte(&s->gb);
791 g = bytestream2_get_byte(&s->gb);
792 b = bytestream2_get_byte(&s->gb);
793 s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b;
796 s->palette[i] = (0xFFU << 24);
797 s->hdr_state |= PNG_PLTE;
798 bytestream2_skip(&s->gb, 4); /* crc */
803 static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s,
808 if (!(s->hdr_state & PNG_IHDR)) {
809 av_log(avctx, AV_LOG_ERROR, "trns before IHDR\n");
810 return AVERROR_INVALIDDATA;
813 if (s->pic_state & PNG_IDAT) {
814 av_log(avctx, AV_LOG_ERROR, "trns after IDAT\n");
815 return AVERROR_INVALIDDATA;
818 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
819 if (length > 256 || !(s->hdr_state & PNG_PLTE))
820 return AVERROR_INVALIDDATA;
822 for (i = 0; i < length; i++) {
823 unsigned v = bytestream2_get_byte(&s->gb);
824 s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
826 } else if (s->color_type == PNG_COLOR_TYPE_GRAY || s->color_type == PNG_COLOR_TYPE_RGB) {
827 if ((s->color_type == PNG_COLOR_TYPE_GRAY && length != 2) ||
828 (s->color_type == PNG_COLOR_TYPE_RGB && length != 6) ||
830 return AVERROR_INVALIDDATA;
832 for (i = 0; i < length / 2; i++) {
833 /* only use the least significant bits */
834 v = av_mod_uintp2(bytestream2_get_be16(&s->gb), s->bit_depth);
836 if (s->bit_depth > 8)
837 AV_WB16(&s->transparent_color_be[2 * i], v);
839 s->transparent_color_be[i] = v;
842 return AVERROR_INVALIDDATA;
845 bytestream2_skip(&s->gb, 4); /* crc */
851 static int decode_iccp_chunk(PNGDecContext *s, int length, AVFrame *f)
854 uint8_t *data, profile_name[82];
858 while ((profile_name[cnt++] = bytestream2_get_byte(&s->gb)) && cnt < 81);
860 av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid name!\n");
861 return AVERROR_INVALIDDATA;
864 length = FFMAX(length - cnt, 0);
866 if (bytestream2_get_byte(&s->gb) != 0) {
867 av_log(s->avctx, AV_LOG_ERROR, "iCCP with invalid compression!\n");
868 return AVERROR_INVALIDDATA;
871 length = FFMAX(length - 1, 0);
873 if ((ret = decode_zbuf(&bp, s->gb.buffer, s->gb.buffer + length)) < 0)
876 ret = av_bprint_finalize(&bp, (char **)&data);
880 sd = av_frame_new_side_data(f, AV_FRAME_DATA_ICC_PROFILE, bp.len);
883 return AVERROR(ENOMEM);
886 av_dict_set(&sd->metadata, "name", profile_name, 0);
887 memcpy(sd->data, data, bp.len);
890 /* ICC compressed data and CRC */
891 bytestream2_skip(&s->gb, length + 4);
896 static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
898 if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE) {
900 uint8_t *pd = p->data[0];
901 for (j = 0; j < s->height; j++) {
903 for (k = 7; k >= 1; k--)
904 if ((s->width&7) >= k)
905 pd[8*i + k - 1] = (pd[i]>>8-k) & 1;
906 for (i--; i >= 0; i--) {
907 pd[8*i + 7]= pd[i] & 1;
908 pd[8*i + 6]= (pd[i]>>1) & 1;
909 pd[8*i + 5]= (pd[i]>>2) & 1;
910 pd[8*i + 4]= (pd[i]>>3) & 1;
911 pd[8*i + 3]= (pd[i]>>4) & 1;
912 pd[8*i + 2]= (pd[i]>>5) & 1;
913 pd[8*i + 1]= (pd[i]>>6) & 1;
914 pd[8*i + 0]= pd[i]>>7;
916 pd += s->image_linesize;
918 } else if (s->bits_per_pixel == 2) {
920 uint8_t *pd = p->data[0];
921 for (j = 0; j < s->height; j++) {
923 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
924 if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3;
925 if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3;
926 if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6;
927 for (i--; i >= 0; i--) {
928 pd[4*i + 3]= pd[i] & 3;
929 pd[4*i + 2]= (pd[i]>>2) & 3;
930 pd[4*i + 1]= (pd[i]>>4) & 3;
931 pd[4*i + 0]= pd[i]>>6;
934 if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
935 if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
936 if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55;
937 for (i--; i >= 0; i--) {
938 pd[4*i + 3]= ( pd[i] & 3)*0x55;
939 pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55;
940 pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55;
941 pd[4*i + 0]= ( pd[i]>>6 )*0x55;
944 pd += s->image_linesize;
946 } else if (s->bits_per_pixel == 4) {
948 uint8_t *pd = p->data[0];
949 for (j = 0; j < s->height; j++) {
951 if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
952 if (s->width&1) pd[2*i+0]= pd[i]>>4;
953 for (i--; i >= 0; i--) {
954 pd[2*i + 1] = pd[i] & 15;
955 pd[2*i + 0] = pd[i] >> 4;
958 if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11;
959 for (i--; i >= 0; i--) {
960 pd[2*i + 1] = (pd[i] & 15) * 0x11;
961 pd[2*i + 0] = (pd[i] >> 4) * 0x11;
964 pd += s->image_linesize;
969 static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
972 uint32_t sequence_number;
973 int cur_w, cur_h, x_offset, y_offset, dispose_op, blend_op;
976 return AVERROR_INVALIDDATA;
978 if (!(s->hdr_state & PNG_IHDR)) {
979 av_log(avctx, AV_LOG_ERROR, "fctl before IHDR\n");
980 return AVERROR_INVALIDDATA;
983 if (s->pic_state & PNG_IDAT) {
984 av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n");
985 return AVERROR_INVALIDDATA;
988 s->last_w = s->cur_w;
989 s->last_h = s->cur_h;
990 s->last_x_offset = s->x_offset;
991 s->last_y_offset = s->y_offset;
992 s->last_dispose_op = s->dispose_op;
994 sequence_number = bytestream2_get_be32(&s->gb);
995 cur_w = bytestream2_get_be32(&s->gb);
996 cur_h = bytestream2_get_be32(&s->gb);
997 x_offset = bytestream2_get_be32(&s->gb);
998 y_offset = bytestream2_get_be32(&s->gb);
999 bytestream2_skip(&s->gb, 4); /* delay_num (2), delay_den (2) */
1000 dispose_op = bytestream2_get_byte(&s->gb);
1001 blend_op = bytestream2_get_byte(&s->gb);
1002 bytestream2_skip(&s->gb, 4); /* crc */
1004 if (sequence_number == 0 &&
1005 (cur_w != s->width ||
1006 cur_h != s->height ||
1009 cur_w <= 0 || cur_h <= 0 ||
1010 x_offset < 0 || y_offset < 0 ||
1011 cur_w > s->width - x_offset|| cur_h > s->height - y_offset)
1012 return AVERROR_INVALIDDATA;
1014 if (blend_op != APNG_BLEND_OP_OVER && blend_op != APNG_BLEND_OP_SOURCE) {
1015 av_log(avctx, AV_LOG_ERROR, "Invalid blend_op %d\n", blend_op);
1016 return AVERROR_INVALIDDATA;
1019 if ((sequence_number == 0 || !s->last_picture.f->data[0]) &&
1020 dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1021 // No previous frame to revert to for the first frame
1022 // Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
1023 dispose_op = APNG_DISPOSE_OP_BACKGROUND;
1026 if (blend_op == APNG_BLEND_OP_OVER && !s->has_trns && (
1027 avctx->pix_fmt == AV_PIX_FMT_RGB24 ||
1028 avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
1029 avctx->pix_fmt == AV_PIX_FMT_PAL8 ||
1030 avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
1031 avctx->pix_fmt == AV_PIX_FMT_GRAY16BE ||
1032 avctx->pix_fmt == AV_PIX_FMT_MONOBLACK
1034 // APNG_BLEND_OP_OVER is the same as APNG_BLEND_OP_SOURCE when there is no alpha channel
1035 blend_op = APNG_BLEND_OP_SOURCE;
1040 s->x_offset = x_offset;
1041 s->y_offset = y_offset;
1042 s->dispose_op = dispose_op;
1043 s->blend_op = blend_op;
1048 static void handle_p_frame_png(PNGDecContext *s, AVFrame *p)
1051 uint8_t *pd = p->data[0];
1052 uint8_t *pd_last = s->last_picture.f->data[0];
1053 int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
1055 ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1056 for (j = 0; j < s->height; j++) {
1057 for (i = 0; i < ls; i++)
1058 pd[i] += pd_last[i];
1059 pd += s->image_linesize;
1060 pd_last += s->image_linesize;
1064 // divide by 255 and round to nearest
1065 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
1066 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
1068 static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s,
1074 if (s->blend_op == APNG_BLEND_OP_OVER &&
1075 avctx->pix_fmt != AV_PIX_FMT_RGBA &&
1076 avctx->pix_fmt != AV_PIX_FMT_GRAY8A &&
1077 avctx->pix_fmt != AV_PIX_FMT_PAL8) {
1078 avpriv_request_sample(avctx, "Blending with pixel format %s",
1079 av_get_pix_fmt_name(avctx->pix_fmt));
1080 return AVERROR_PATCHWELCOME;
1083 buffer = av_malloc_array(s->image_linesize, s->height);
1085 return AVERROR(ENOMEM);
1087 ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
1089 // need to reset a rectangle to background:
1090 // create a new writable copy
1091 if (s->last_dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
1092 int ret = av_frame_make_writable(s->last_picture.f);
1096 for (y = s->last_y_offset; y < s->last_y_offset + s->last_h; y++) {
1097 memset(s->last_picture.f->data[0] + s->image_linesize * y +
1098 s->bpp * s->last_x_offset, 0, s->bpp * s->last_w);
1102 memcpy(buffer, s->last_picture.f->data[0], s->image_linesize * s->height);
1105 if (s->blend_op == APNG_BLEND_OP_SOURCE) {
1106 for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1107 size_t row_start = s->image_linesize * y + s->bpp * s->x_offset;
1108 memcpy(buffer + row_start, p->data[0] + row_start, s->bpp * s->cur_w);
1110 } else { // APNG_BLEND_OP_OVER
1111 for (y = s->y_offset; y < s->y_offset + s->cur_h; ++y) {
1112 uint8_t *foreground = p->data[0] + s->image_linesize * y + s->bpp * s->x_offset;
1113 uint8_t *background = buffer + s->image_linesize * y + s->bpp * s->x_offset;
1114 for (x = s->x_offset; x < s->x_offset + s->cur_w; ++x, foreground += s->bpp, background += s->bpp) {
1116 uint8_t foreground_alpha, background_alpha, output_alpha;
1119 // Since we might be blending alpha onto alpha, we use the following equations:
1120 // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha
1121 // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha
1123 switch (avctx->pix_fmt) {
1124 case AV_PIX_FMT_RGBA:
1125 foreground_alpha = foreground[3];
1126 background_alpha = background[3];
1129 case AV_PIX_FMT_GRAY8A:
1130 foreground_alpha = foreground[1];
1131 background_alpha = background[1];
1134 case AV_PIX_FMT_PAL8:
1135 foreground_alpha = s->palette[foreground[0]] >> 24;
1136 background_alpha = s->palette[background[0]] >> 24;
1140 if (foreground_alpha == 0)
1143 if (foreground_alpha == 255) {
1144 memcpy(background, foreground, s->bpp);
1148 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1149 // TODO: Alpha blending with PAL8 will likely need the entire image converted over to RGBA first
1150 avpriv_request_sample(avctx, "Alpha blending palette samples");
1151 background[0] = foreground[0];
1155 output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha);
1157 av_assert0(s->bpp <= 10);
1159 for (b = 0; b < s->bpp - 1; ++b) {
1160 if (output_alpha == 0) {
1162 } else if (background_alpha == 255) {
1163 output[b] = FAST_DIV255(foreground_alpha * foreground[b] + (255 - foreground_alpha) * background[b]);
1165 output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha);
1168 output[b] = output_alpha;
1169 memcpy(background, output, s->bpp);
1174 // Copy blended buffer into the frame and free
1175 memcpy(p->data[0], buffer, s->image_linesize * s->height);
1181 static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
1182 AVFrame *p, const AVPacket *avpkt)
1184 const AVCRC *crc_tab = av_crc_get_table(AV_CRC_32_IEEE_LE);
1185 AVDictionary **metadatap = NULL;
1186 uint32_t tag, length;
1187 int decode_next_dat = 0;
1191 length = bytestream2_get_bytes_left(&s->gb);
1194 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1195 avctx->skip_frame == AVDISCARD_ALL) {
1199 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) {
1200 if (!(s->pic_state & PNG_IDAT))
1205 av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length);
1206 if ( s->pic_state & PNG_ALLIMAGE
1207 && avctx->strict_std_compliance <= FF_COMPLIANCE_NORMAL)
1209 ret = AVERROR_INVALIDDATA;
1213 length = bytestream2_get_be32(&s->gb);
1214 if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) {
1215 av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
1216 ret = AVERROR_INVALIDDATA;
1219 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_IGNORE_ERR)) {
1220 uint32_t crc_sig = AV_RB32(s->gb.buffer + length + 4);
1221 uint32_t crc_cal = ~av_crc(crc_tab, UINT32_MAX, s->gb.buffer, length + 4);
1222 if (crc_sig ^ crc_cal) {
1223 av_log(avctx, AV_LOG_ERROR, "CRC mismatch in chunk");
1224 if (avctx->err_recognition & AV_EF_EXPLODE) {
1225 av_log(avctx, AV_LOG_ERROR, ", quitting\n");
1226 ret = AVERROR_INVALIDDATA;
1229 av_log(avctx, AV_LOG_ERROR, ", skipping\n");
1230 bytestream2_skip(&s->gb, 4); /* tag */
1234 tag = bytestream2_get_le32(&s->gb);
1235 if (avctx->debug & FF_DEBUG_STARTCODE)
1236 av_log(avctx, AV_LOG_DEBUG, "png: tag=%s length=%u\n",
1237 av_fourcc2str(tag), length);
1239 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1240 avctx->skip_frame == AVDISCARD_ALL) {
1242 case MKTAG('I', 'H', 'D', 'R'):
1243 case MKTAG('p', 'H', 'Y', 's'):
1244 case MKTAG('t', 'E', 'X', 't'):
1245 case MKTAG('I', 'D', 'A', 'T'):
1246 case MKTAG('t', 'R', 'N', 'S'):
1253 metadatap = &p->metadata;
1255 case MKTAG('I', 'H', 'D', 'R'):
1256 if ((ret = decode_ihdr_chunk(avctx, s, length)) < 0)
1259 case MKTAG('p', 'H', 'Y', 's'):
1260 if ((ret = decode_phys_chunk(avctx, s)) < 0)
1263 case MKTAG('f', 'c', 'T', 'L'):
1264 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1266 if ((ret = decode_fctl_chunk(avctx, s, length)) < 0)
1268 decode_next_dat = 1;
1270 case MKTAG('f', 'd', 'A', 'T'):
1271 if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG)
1273 if (!decode_next_dat || length < 4) {
1274 ret = AVERROR_INVALIDDATA;
1277 bytestream2_get_be32(&s->gb);
1280 case MKTAG('I', 'D', 'A', 'T'):
1281 if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat)
1283 if ((ret = decode_idat_chunk(avctx, s, length, p)) < 0)
1286 case MKTAG('P', 'L', 'T', 'E'):
1287 if (decode_plte_chunk(avctx, s, length) < 0)
1290 case MKTAG('t', 'R', 'N', 'S'):
1291 if (decode_trns_chunk(avctx, s, length) < 0)
1294 case MKTAG('t', 'E', 'X', 't'):
1295 if (decode_text_chunk(s, length, 0, metadatap) < 0)
1296 av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n");
1297 bytestream2_skip(&s->gb, length + 4);
1299 case MKTAG('z', 'T', 'X', 't'):
1300 if (decode_text_chunk(s, length, 1, metadatap) < 0)
1301 av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n");
1302 bytestream2_skip(&s->gb, length + 4);
1304 case MKTAG('s', 'T', 'E', 'R'): {
1305 int mode = bytestream2_get_byte(&s->gb);
1306 AVStereo3D *stereo3d = av_stereo3d_create_side_data(p);
1308 ret = AVERROR(ENOMEM);
1312 if (mode == 0 || mode == 1) {
1313 stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1314 stereo3d->flags = mode ? 0 : AV_STEREO3D_FLAG_INVERT;
1316 av_log(avctx, AV_LOG_WARNING,
1317 "Unknown value in sTER chunk (%d)\n", mode);
1319 bytestream2_skip(&s->gb, 4); /* crc */
1322 case MKTAG('i', 'C', 'C', 'P'): {
1323 if ((ret = decode_iccp_chunk(s, length, p)) < 0)
1327 case MKTAG('c', 'H', 'R', 'M'): {
1328 AVMasteringDisplayMetadata *mdm = av_mastering_display_metadata_create_side_data(p);
1330 ret = AVERROR(ENOMEM);
1334 mdm->white_point[0] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1335 mdm->white_point[1] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1338 for (i = 0; i < 3; i++) {
1339 mdm->display_primaries[i][0] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1340 mdm->display_primaries[i][1] = av_make_q(bytestream2_get_be32(&s->gb), 100000);
1343 mdm->has_primaries = 1;
1344 bytestream2_skip(&s->gb, 4); /* crc */
1347 case MKTAG('g', 'A', 'M', 'A'): {
1350 int num = bytestream2_get_be32(&s->gb);
1352 av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
1353 av_bprintf(&bp, "%i/%i", num, 100000);
1354 ret = av_bprint_finalize(&bp, &gamma_str);
1358 av_dict_set(&p->metadata, "gamma", gamma_str, AV_DICT_DONT_STRDUP_VAL);
1360 bytestream2_skip(&s->gb, 4); /* crc */
1363 case MKTAG('I', 'E', 'N', 'D'):
1364 if (!(s->pic_state & PNG_ALLIMAGE))
1365 av_log(avctx, AV_LOG_ERROR, "IEND without all image\n");
1366 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1367 ret = AVERROR_INVALIDDATA;
1370 bytestream2_skip(&s->gb, 4); /* crc */
1375 bytestream2_skip(&s->gb, length + 4);
1381 if (avctx->codec_id == AV_CODEC_ID_PNG &&
1382 avctx->skip_frame == AVDISCARD_ALL) {
1386 if (percent_missing(s) > avctx->discard_damaged_percentage)
1387 return AVERROR_INVALIDDATA;
1389 if (s->bits_per_pixel <= 4)
1390 handle_small_bpp(s, p);
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;
1398 av_assert0(s->bit_depth > 1);
1400 for (y = 0; y < s->height; ++y) {
1401 uint8_t *row = &s->image_buf[s->image_linesize * y];
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;
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;
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);
1427 if (!memcmp(pixel, s->transparent_color_be, raw_bpp)) {
1428 memset(&pixel[raw_bpp], 0, byte_depth);
1430 memset(&pixel[raw_bpp], 0xff, byte_depth);
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
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)
1452 ff_thread_report_progress(&s->picture, INT_MAX, 0);
1457 ff_thread_report_progress(&s->picture, INT_MAX, 0);
1461 #if CONFIG_PNG_DECODER
1462 static int decode_frame_png(AVCodecContext *avctx,
1463 void *data, int *got_frame,
1466 PNGDecContext *const s = avctx->priv_data;
1467 const uint8_t *buf = avpkt->data;
1468 int buf_size = avpkt->size;
1469 AVFrame *p = s->picture.f;
1473 bytestream2_init(&s->gb, buf, buf_size);
1475 /* check signature */
1476 sig = bytestream2_get_be64(&s->gb);
1477 if (sig != PNGSIG &&
1479 av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature 0x%08"PRIX64".\n", sig);
1480 return AVERROR_INVALIDDATA;
1483 s->y = s->has_trns = 0;
1488 s->zstream.zalloc = ff_png_zalloc;
1489 s->zstream.zfree = ff_png_zfree;
1490 s->zstream.opaque = NULL;
1491 ret = inflateInit(&s->zstream);
1493 av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1494 return AVERROR_EXTERNAL;
1497 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1500 if (avctx->skip_frame == AVDISCARD_ALL) {
1502 ret = bytestream2_tell(&s->gb);
1506 if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1509 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1510 ff_thread_release_buffer(avctx, &s->last_picture);
1511 FFSWAP(ThreadFrame, s->picture, s->last_picture);
1516 ret = bytestream2_tell(&s->gb);
1518 inflateEnd(&s->zstream);
1524 #if CONFIG_APNG_DECODER
1525 static int decode_frame_apng(AVCodecContext *avctx,
1526 void *data, int *got_frame,
1529 PNGDecContext *const s = avctx->priv_data;
1531 AVFrame *p = s->picture.f;
1533 if (!(s->hdr_state & PNG_IHDR)) {
1534 if (!avctx->extradata_size)
1535 return AVERROR_INVALIDDATA;
1537 /* only init fields, there is no zlib use in extradata */
1538 s->zstream.zalloc = ff_png_zalloc;
1539 s->zstream.zfree = ff_png_zfree;
1541 bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
1542 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1546 /* reset state for a new frame */
1547 if ((ret = inflateInit(&s->zstream)) != Z_OK) {
1548 av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
1549 ret = AVERROR_EXTERNAL;
1554 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
1555 if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
1558 if (!(s->pic_state & PNG_ALLIMAGE))
1559 av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n");
1560 if (!(s->pic_state & (PNG_ALLIMAGE|PNG_IDAT))) {
1561 ret = AVERROR_INVALIDDATA;
1564 if ((ret = av_frame_ref(data, s->picture.f)) < 0)
1567 if (!(avctx->active_thread_type & FF_THREAD_FRAME)) {
1568 if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
1569 ff_thread_release_buffer(avctx, &s->picture);
1570 } else if (s->dispose_op == APNG_DISPOSE_OP_NONE) {
1571 ff_thread_release_buffer(avctx, &s->last_picture);
1572 FFSWAP(ThreadFrame, s->picture, s->last_picture);
1577 ret = bytestream2_tell(&s->gb);
1580 inflateEnd(&s->zstream);
1586 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1588 PNGDecContext *psrc = src->priv_data;
1589 PNGDecContext *pdst = dst->priv_data;
1590 ThreadFrame *src_frame = NULL;
1596 if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) {
1598 pdst->width = psrc->width;
1599 pdst->height = psrc->height;
1600 pdst->bit_depth = psrc->bit_depth;
1601 pdst->color_type = psrc->color_type;
1602 pdst->compression_type = psrc->compression_type;
1603 pdst->interlace_type = psrc->interlace_type;
1604 pdst->filter_type = psrc->filter_type;
1605 pdst->cur_w = psrc->cur_w;
1606 pdst->cur_h = psrc->cur_h;
1607 pdst->x_offset = psrc->x_offset;
1608 pdst->y_offset = psrc->y_offset;
1609 pdst->has_trns = psrc->has_trns;
1610 memcpy(pdst->transparent_color_be, psrc->transparent_color_be, sizeof(pdst->transparent_color_be));
1612 pdst->dispose_op = psrc->dispose_op;
1614 memcpy(pdst->palette, psrc->palette, sizeof(pdst->palette));
1616 pdst->hdr_state |= psrc->hdr_state;
1619 src_frame = psrc->dispose_op == APNG_DISPOSE_OP_NONE ?
1620 &psrc->picture : &psrc->last_picture;
1622 ff_thread_release_buffer(dst, &pdst->last_picture);
1623 if (src_frame && src_frame->f->data[0]) {
1624 ret = ff_thread_ref_frame(&pdst->last_picture, src_frame);
1633 static av_cold int png_dec_init(AVCodecContext *avctx)
1635 PNGDecContext *s = avctx->priv_data;
1637 avctx->color_range = AVCOL_RANGE_JPEG;
1640 s->last_picture.f = av_frame_alloc();
1641 s->picture.f = av_frame_alloc();
1642 if (!s->last_picture.f || !s->picture.f) {
1643 av_frame_free(&s->last_picture.f);
1644 av_frame_free(&s->picture.f);
1645 return AVERROR(ENOMEM);
1648 ff_pngdsp_init(&s->dsp);
1653 static av_cold int png_dec_end(AVCodecContext *avctx)
1655 PNGDecContext *s = avctx->priv_data;
1657 ff_thread_release_buffer(avctx, &s->last_picture);
1658 av_frame_free(&s->last_picture.f);
1659 ff_thread_release_buffer(avctx, &s->picture);
1660 av_frame_free(&s->picture.f);
1661 av_freep(&s->buffer);
1663 av_freep(&s->last_row);
1664 s->last_row_size = 0;
1665 av_freep(&s->tmp_row);
1666 s->tmp_row_size = 0;
1671 #if CONFIG_APNG_DECODER
1672 AVCodec ff_apng_decoder = {
1674 .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
1675 .type = AVMEDIA_TYPE_VIDEO,
1676 .id = AV_CODEC_ID_APNG,
1677 .priv_data_size = sizeof(PNGDecContext),
1678 .init = png_dec_init,
1679 .close = png_dec_end,
1680 .decode = decode_frame_apng,
1681 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1682 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1683 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
1684 FF_CODEC_CAP_ALLOCATE_PROGRESS,
1688 #if CONFIG_PNG_DECODER
1689 AVCodec ff_png_decoder = {
1691 .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
1692 .type = AVMEDIA_TYPE_VIDEO,
1693 .id = AV_CODEC_ID_PNG,
1694 .priv_data_size = sizeof(PNGDecContext),
1695 .init = png_dec_init,
1696 .close = png_dec_end,
1697 .decode = decode_frame_png,
1698 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
1699 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
1700 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_THREADSAFE |
1701 FF_CODEC_CAP_ALLOCATE_PROGRESS,