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 * - add 2, 4 and 16 bit depth support
25 * - use filters when generating a png (better compression)
32 #define PNG_COLOR_MASK_PALETTE 1
33 #define PNG_COLOR_MASK_COLOR 2
34 #define PNG_COLOR_MASK_ALPHA 4
36 #define PNG_COLOR_TYPE_GRAY 0
37 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
38 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
39 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
40 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
42 #define PNG_FILTER_VALUE_NONE 0
43 #define PNG_FILTER_VALUE_SUB 1
44 #define PNG_FILTER_VALUE_UP 2
45 #define PNG_FILTER_VALUE_AVG 3
46 #define PNG_FILTER_VALUE_PAETH 4
48 #define PNG_IHDR 0x0001
49 #define PNG_IDAT 0x0002
50 #define PNG_ALLIMAGE 0x0004
51 #define PNG_PLTE 0x0008
55 #define IOBUF_SIZE 4096
57 typedef struct PNGContext {
59 uint8_t *bytestream_start;
60 uint8_t *bytestream_end;
76 uint32_t palette[256];
81 int crow_size; /* compressed row size (include filter type) */
82 int row_size; /* decompressed row size */
83 int pass_row_size; /* decompress row size of the current pass */
86 uint8_t buf[IOBUF_SIZE];
89 static unsigned int get32(uint8_t **b){
91 return ((*b)[-4]<<24) + ((*b)[-3]<<16) + ((*b)[-2]<<8) + (*b)[-1];
94 #ifdef CONFIG_ENCODERS
95 static void put32(uint8_t **b, unsigned int v){
103 static const uint8_t pngsig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
105 /* Mask to determine which y pixels are valid in a pass */
106 static const uint8_t png_pass_ymask[NB_PASSES] = {
107 0x80, 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55,
110 /* Mask to determine which y pixels can be written in a pass */
111 static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
112 0xff, 0xff, 0x0f, 0xcc, 0x33, 0xff, 0x55,
115 /* minimum x value */
116 static const uint8_t png_pass_xmin[NB_PASSES] = {
120 /* x shift to get row width */
121 static const uint8_t png_pass_xshift[NB_PASSES] = {
125 /* Mask to determine which pixels are valid in a pass */
126 static const uint8_t png_pass_mask[NB_PASSES] = {
127 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff
130 /* Mask to determine which pixels to overwrite while displaying */
131 static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
132 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff
135 static int png_probe(AVProbeData *pd)
137 if (pd->buf_size >= 8 &&
138 memcmp(pd->buf, pngsig, 8) == 0)
139 return AVPROBE_SCORE_MAX;
144 static void *png_zalloc(void *opaque, unsigned int items, unsigned int size)
146 if(items >= UINT_MAX / size)
148 return av_malloc(items * size);
151 static void png_zfree(void *opaque, void *ptr)
156 static int png_get_nb_channels(int color_type)
160 if ((color_type & (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)) ==
161 PNG_COLOR_MASK_COLOR)
163 if (color_type & PNG_COLOR_MASK_ALPHA)
168 /* compute the row size of an interleaved pass */
169 static int png_pass_row_size(int pass, int bits_per_pixel, int width)
171 int shift, xmin, pass_width;
173 xmin = png_pass_xmin[pass];
176 shift = png_pass_xshift[pass];
177 pass_width = (width - xmin + (1 << shift) - 1) >> shift;
178 return (pass_width * bits_per_pixel + 7) >> 3;
181 /* NOTE: we try to construct a good looking image at each pass. width
182 is the original image width. We also do pixel format convertion at
184 static void png_put_interlaced_row(uint8_t *dst, int width,
185 int bits_per_pixel, int pass,
186 int color_type, const uint8_t *src)
188 int x, mask, dsp_mask, j, src_x, b, bpp;
192 mask = png_pass_mask[pass];
193 dsp_mask = png_pass_dsp_mask[pass];
194 switch(bits_per_pixel) {
196 /* we must intialize the line to zero before writing to it */
198 memset(dst, 0, (width + 7) >> 3);
200 for(x = 0; x < width; x++) {
202 if ((dsp_mask << j) & 0x80) {
203 b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
204 dst[x >> 3] |= b << (7 - j);
206 if ((mask << j) & 0x80)
211 bpp = bits_per_pixel >> 3;
214 if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
215 for(x = 0; x < width; x++) {
217 if ((dsp_mask << j) & 0x80) {
218 *(uint32_t *)d = (s[3] << 24) | (s[0] << 16) | (s[1] << 8) | s[2];
221 if ((mask << j) & 0x80)
225 for(x = 0; x < width; x++) {
227 if ((dsp_mask << j) & 0x80) {
231 if ((mask << j) & 0x80)
239 #ifdef CONFIG_ENCODERS
240 static void png_get_interlaced_row(uint8_t *dst, int row_size,
241 int bits_per_pixel, int pass,
242 const uint8_t *src, int width)
244 int x, mask, dst_x, j, b, bpp;
248 mask = png_pass_mask[pass];
249 switch(bits_per_pixel) {
251 memset(dst, 0, row_size);
253 for(x = 0; x < width; x++) {
255 if ((mask << j) & 0x80) {
256 b = (src[x >> 3] >> (7 - j)) & 1;
257 dst[dst_x >> 3] |= b << (7 - (dst_x & 7));
263 bpp = bits_per_pixel >> 3;
266 for(x = 0; x < width; x++) {
268 if ((mask << j) & 0x80) {
280 /* NOTE: 'dst' can be equal to 'last' */
281 static void png_filter_row(uint8_t *dst, int filter_type,
282 uint8_t *src, uint8_t *last, int size, int bpp)
286 switch(filter_type) {
287 case PNG_FILTER_VALUE_NONE:
288 memcpy(dst, src, size);
290 case PNG_FILTER_VALUE_SUB:
291 for(i = 0; i < bpp; i++) {
294 for(i = bpp; i < size; i++) {
299 case PNG_FILTER_VALUE_UP:
300 for(i = 0; i < size; i++) {
305 case PNG_FILTER_VALUE_AVG:
306 for(i = 0; i < bpp; i++) {
310 for(i = bpp; i < size; i++) {
311 p = ((dst[i - bpp] + last[i]) >> 1);
315 case PNG_FILTER_VALUE_PAETH:
316 for(i = 0; i < bpp; i++) {
320 for(i = bpp; i < size; i++) {
321 int a, b, c, pa, pb, pc;
334 if (pa <= pb && pa <= pc)
346 #ifdef CONFIG_ENCODERS
347 static void convert_from_rgba32(uint8_t *dst, const uint8_t *src, int width)
354 for(j = 0; j < width; j++) {
355 v = ((const uint32_t *)src)[j];
365 #ifdef CONFIG_DECODERS
366 static void convert_to_rgba32(uint8_t *dst, const uint8_t *src, int width)
369 unsigned int r, g, b, a;
371 for(j = 0;j < width; j++) {
376 *(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b;
382 /* process exactly one decompressed row */
383 static void png_handle_row(PNGContext *s)
385 uint8_t *ptr, *last_row;
388 if (!s->interlace_type) {
389 ptr = s->image_buf + s->image_linesize * s->y;
390 /* need to swap bytes correctly for RGB_ALPHA */
391 if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
392 png_filter_row(s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
393 s->last_row, s->row_size, s->bpp);
394 memcpy(s->last_row, s->tmp_row, s->row_size);
395 convert_to_rgba32(ptr, s->tmp_row, s->width);
397 /* in normal case, we avoid one copy */
399 last_row = s->last_row;
401 last_row = ptr - s->image_linesize;
403 png_filter_row(ptr, s->crow_buf[0], s->crow_buf + 1,
404 last_row, s->row_size, s->bpp);
407 if (s->y == s->height) {
408 s->state |= PNG_ALLIMAGE;
413 ptr = s->image_buf + s->image_linesize * s->y;
414 if ((png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
415 /* if we already read one row, it is time to stop to
416 wait for the next one */
419 png_filter_row(s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
420 s->last_row, s->pass_row_size, s->bpp);
421 memcpy(s->last_row, s->tmp_row, s->pass_row_size);
424 if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
425 /* NOTE: rgba32 is handled directly in png_put_interlaced_row */
426 png_put_interlaced_row(ptr, s->width, s->bits_per_pixel, s->pass,
427 s->color_type, s->last_row);
430 if (s->y == s->height) {
432 if (s->pass == NB_PASSES - 1) {
433 s->state |= PNG_ALLIMAGE;
438 s->pass_row_size = png_pass_row_size(s->pass,
441 s->crow_size = s->pass_row_size + 1;
442 if (s->pass_row_size != 0)
444 /* skip pass if empty row */
453 static int png_decode_idat(PNGContext *s, int length)
456 s->zstream.avail_in = length;
457 s->zstream.next_in = s->bytestream;
458 s->bytestream += length;
460 if(s->bytestream > s->bytestream_end)
463 /* decode one line if possible */
464 while (s->zstream.avail_in > 0) {
465 ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
466 if (ret != Z_OK && ret != Z_STREAM_END) {
469 if (s->zstream.avail_out == 0) {
470 if (!(s->state & PNG_ALLIMAGE)) {
473 s->zstream.avail_out = s->crow_size;
474 s->zstream.next_out = s->crow_buf;
480 static int decode_frame(AVCodecContext *avctx,
481 void *data, int *data_size,
482 uint8_t *buf, int buf_size)
484 PNGContext * const s = avctx->priv_data;
485 AVFrame *picture = data;
486 AVFrame * const p= (AVFrame*)&s->picture;
487 uint32_t tag, length;
492 s->bytestream_end= buf + buf_size;
494 /* check signature */
495 if (memcmp(s->bytestream, pngsig, 8) != 0)
500 // memset(s, 0, sizeof(PNGContext));
502 s->zstream.zalloc = png_zalloc;
503 s->zstream.zfree = png_zfree;
504 s->zstream.opaque = NULL;
505 ret = inflateInit(&s->zstream);
510 if (s->bytestream >= s->bytestream_end)
512 length = get32(&s->bytestream);
513 if (length > 0x7fffffff)
515 tag32 = get32(&s->bytestream);
516 tag = bswap_32(tag32);
518 av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n",
521 ((tag >> 16) & 0xff),
522 ((tag >> 24) & 0xff), length);
525 case MKTAG('I', 'H', 'D', 'R'):
528 s->width = get32(&s->bytestream);
529 s->height = get32(&s->bytestream);
530 if(avcodec_check_dimensions(avctx, s->width, s->height)){
531 s->width= s->height= 0;
534 s->bit_depth = *s->bytestream++;
535 s->color_type = *s->bytestream++;
536 s->compression_type = *s->bytestream++;
537 s->filter_type = *s->bytestream++;
538 s->interlace_type = *s->bytestream++;
539 crc = get32(&s->bytestream);
540 s->state |= PNG_IHDR;
542 av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d compression_type=%d filter_type=%d interlace_type=%d\n",
543 s->width, s->height, s->bit_depth, s->color_type,
544 s->compression_type, s->filter_type, s->interlace_type);
547 case MKTAG('I', 'D', 'A', 'T'):
548 if (!(s->state & PNG_IHDR))
550 if (!(s->state & PNG_IDAT)) {
551 /* init image info */
552 avctx->width = s->width;
553 avctx->height = s->height;
555 s->channels = png_get_nb_channels(s->color_type);
556 s->bits_per_pixel = s->bit_depth * s->channels;
557 s->bpp = (s->bits_per_pixel + 7) >> 3;
558 s->row_size = (avctx->width * s->bits_per_pixel + 7) >> 3;
560 if (s->bit_depth == 8 &&
561 s->color_type == PNG_COLOR_TYPE_RGB) {
562 avctx->pix_fmt = PIX_FMT_RGB24;
563 } else if (s->bit_depth == 8 &&
564 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
565 avctx->pix_fmt = PIX_FMT_RGB32;
566 } else if (s->bit_depth == 8 &&
567 s->color_type == PNG_COLOR_TYPE_GRAY) {
568 avctx->pix_fmt = PIX_FMT_GRAY8;
569 } else if (s->bit_depth == 16 &&
570 s->color_type == PNG_COLOR_TYPE_GRAY) {
571 avctx->pix_fmt = PIX_FMT_GRAY16BE;
572 } else if (s->bit_depth == 1 &&
573 s->color_type == PNG_COLOR_TYPE_GRAY) {
574 avctx->pix_fmt = PIX_FMT_MONOBLACK;
575 } else if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
576 avctx->pix_fmt = PIX_FMT_PAL8;
581 avctx->release_buffer(avctx, p);
584 if(avctx->get_buffer(avctx, p) < 0){
585 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
588 p->pict_type= FF_I_TYPE;
590 p->interlaced_frame = !!s->interlace_type;
592 /* compute the compressed row size */
593 if (!s->interlace_type) {
594 s->crow_size = s->row_size + 1;
597 s->pass_row_size = png_pass_row_size(s->pass,
600 s->crow_size = s->pass_row_size + 1;
603 av_log(avctx, AV_LOG_DEBUG, "row_size=%d crow_size =%d\n",
604 s->row_size, s->crow_size);
606 s->image_buf = p->data[0];
607 s->image_linesize = p->linesize[0];
608 /* copy the palette if needed */
609 if (s->color_type == PNG_COLOR_TYPE_PALETTE)
610 memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t));
611 /* empty row is used if differencing to the first row */
612 s->last_row = av_mallocz(s->row_size);
615 if (s->interlace_type ||
616 s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
617 s->tmp_row = av_malloc(s->row_size);
622 s->crow_buf = av_malloc(s->row_size + 1);
625 s->zstream.avail_out = s->crow_size;
626 s->zstream.next_out = s->crow_buf;
628 s->state |= PNG_IDAT;
629 if (png_decode_idat(s, length) < 0)
632 crc = get32(&s->bytestream);
634 case MKTAG('P', 'L', 'T', 'E'):
638 if ((length % 3) != 0 || length > 256 * 3)
640 /* read the palette */
643 r = *s->bytestream++;
644 g = *s->bytestream++;
645 b = *s->bytestream++;
646 s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b;
649 s->palette[i] = (0xff << 24);
651 s->state |= PNG_PLTE;
652 crc = get32(&s->bytestream);
655 case MKTAG('t', 'R', 'N', 'S'):
659 /* read the transparency. XXX: Only palette mode supported */
660 if (s->color_type != PNG_COLOR_TYPE_PALETTE ||
662 !(s->state & PNG_PLTE))
664 for(i=0;i<length;i++) {
665 v = *s->bytestream++;
666 s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
668 crc = get32(&s->bytestream);
671 case MKTAG('I', 'E', 'N', 'D'):
672 if (!(s->state & PNG_ALLIMAGE))
674 crc = get32(&s->bytestream);
679 s->bytestream += length + 4;
684 *picture= *(AVFrame*)&s->picture;
685 *data_size = sizeof(AVPicture);
687 ret = s->bytestream - s->bytestream_start;
689 inflateEnd(&s->zstream);
690 av_freep(&s->crow_buf);
691 av_freep(&s->last_row);
692 av_freep(&s->tmp_row);
700 #ifdef CONFIG_ENCODERS
701 static void png_write_chunk(uint8_t **f, uint32_t tag,
702 const uint8_t *buf, int length)
708 crc = crc32(0, Z_NULL, 0);
710 tagbuf[1] = tag >> 8;
711 tagbuf[2] = tag >> 16;
712 tagbuf[3] = tag >> 24;
713 crc = crc32(crc, tagbuf, 4);
714 put32(f, bswap_32(tag));
716 crc = crc32(crc, buf, length);
717 memcpy(*f, buf, length);
723 /* XXX: use avcodec generic function ? */
724 static void to_be32(uint8_t *p, uint32_t v)
732 /* XXX: do filtering */
733 static int png_write_row(PNGContext *s, const uint8_t *data, int size)
737 s->zstream.avail_in = size;
738 s->zstream.next_in = (uint8_t *)data;
739 while (s->zstream.avail_in > 0) {
740 ret = deflate(&s->zstream, Z_NO_FLUSH);
743 if (s->zstream.avail_out == 0) {
744 if(s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
745 png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
746 s->zstream.avail_out = IOBUF_SIZE;
747 s->zstream.next_out = s->buf;
752 #endif /* CONFIG_ENCODERS */
754 static int common_init(AVCodecContext *avctx){
755 PNGContext *s = avctx->priv_data;
757 avcodec_get_frame_defaults((AVFrame*)&s->picture);
758 avctx->coded_frame= (AVFrame*)&s->picture;
764 #ifdef CONFIG_ENCODERS
765 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
766 PNGContext *s = avctx->priv_data;
767 AVFrame *pict = data;
768 AVFrame * const p= (AVFrame*)&s->picture;
769 int bit_depth, color_type, y, len, row_size, ret, is_progressive;
770 int bits_per_pixel, pass_row_size;
772 uint8_t *crow_buf = NULL;
773 uint8_t *tmp_buf = NULL;
776 p->pict_type= FF_I_TYPE;
781 s->bytestream_end= buf+buf_size;
783 is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT);
784 switch(avctx->pix_fmt) {
787 color_type = PNG_COLOR_TYPE_RGB_ALPHA;
791 color_type = PNG_COLOR_TYPE_RGB;
795 color_type = PNG_COLOR_TYPE_GRAY;
797 case PIX_FMT_MONOBLACK:
799 color_type = PNG_COLOR_TYPE_GRAY;
803 color_type = PNG_COLOR_TYPE_PALETTE;
808 bits_per_pixel = png_get_nb_channels(color_type) * bit_depth;
809 row_size = (avctx->width * bits_per_pixel + 7) >> 3;
811 s->zstream.zalloc = png_zalloc;
812 s->zstream.zfree = png_zfree;
813 s->zstream.opaque = NULL;
814 ret = deflateInit2(&s->zstream, Z_DEFAULT_COMPRESSION,
815 Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
818 crow_buf = av_malloc(row_size + 1);
821 if (is_progressive) {
822 tmp_buf = av_malloc(row_size + 1);
827 /* write png header */
828 memcpy(s->bytestream, pngsig, 8);
831 to_be32(s->buf, avctx->width);
832 to_be32(s->buf + 4, avctx->height);
833 s->buf[8] = bit_depth;
834 s->buf[9] = color_type;
835 s->buf[10] = 0; /* compression type */
836 s->buf[11] = 0; /* filter type */
837 s->buf[12] = is_progressive; /* interlace type */
839 png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
841 /* put the palette if needed */
842 if (color_type == PNG_COLOR_TYPE_PALETTE) {
843 int has_alpha, alpha, i;
848 palette = (uint32_t *)p->data[1];
850 alpha_ptr = s->buf + 256 * 3;
852 for(i = 0; i < 256; i++) {
855 if (alpha && alpha != 0xff)
857 *alpha_ptr++ = alpha;
863 png_write_chunk(&s->bytestream, MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
865 png_write_chunk(&s->bytestream, MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
869 /* now put each row */
870 s->zstream.avail_out = IOBUF_SIZE;
871 s->zstream.next_out = s->buf;
872 if (is_progressive) {
876 for(pass = 0; pass < NB_PASSES; pass++) {
877 /* NOTE: a pass is completely omited if no pixels would be
879 pass_row_size = png_pass_row_size(pass, bits_per_pixel, avctx->width);
880 if (pass_row_size > 0) {
881 for(y = 0; y < avctx->height; y++) {
882 if ((png_pass_ymask[pass] << (y & 7)) & 0x80) {
883 ptr = p->data[0] + y * p->linesize[0];
884 if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
885 convert_from_rgba32(tmp_buf, ptr, avctx->width);
890 png_get_interlaced_row(crow_buf + 1, pass_row_size,
891 bits_per_pixel, pass,
893 crow_buf[0] = PNG_FILTER_VALUE_NONE;
894 png_write_row(s, crow_buf, pass_row_size + 1);
900 for(y = 0; y < avctx->height; y++) {
901 ptr = p->data[0] + y * p->linesize[0];
902 if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
903 convert_from_rgba32(crow_buf + 1, ptr, avctx->width);
905 memcpy(crow_buf + 1, ptr, row_size);
906 crow_buf[0] = PNG_FILTER_VALUE_NONE;
907 png_write_row(s, crow_buf, row_size + 1);
910 /* compress last bytes */
912 ret = deflate(&s->zstream, Z_FINISH);
913 if (ret == Z_OK || ret == Z_STREAM_END) {
914 len = IOBUF_SIZE - s->zstream.avail_out;
915 if (len > 0 && s->bytestream_end - s->bytestream > len + 100) {
916 png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len);
918 s->zstream.avail_out = IOBUF_SIZE;
919 s->zstream.next_out = s->buf;
920 if (ret == Z_STREAM_END)
926 png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0);
928 ret = s->bytestream - s->bytestream_start;
932 deflateEnd(&s->zstream);
940 #ifdef CONFIG_PNG_DECODER
941 AVCodec png_decoder = {
950 0 /*CODEC_CAP_DR1*/ /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
955 #ifdef CONFIG_PNG_ENCODER
956 AVCodec png_encoder = {
964 .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, -1},
966 #endif // CONFIG_PNG_ENCODER