2007-07-15 18:24:26 +00:00
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/*
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* PNG image format
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2009-01-19 15:46:40 +00:00
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* Copyright (c) 2003 Fabrice Bellard
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2007-07-15 18:24:26 +00:00
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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2012-03-22 14:00:48 +00:00
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#include "internal.h"
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2007-07-15 18:24:26 +00:00
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#include "bytestream.h"
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2008-05-09 09:48:49 +00:00
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#include "dsputil.h"
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2007-07-15 18:24:26 +00:00
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#include "png.h"
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2012-06-11 19:41:03 +00:00
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#include "libavutil/avassert.h"
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2013-05-10 15:45:11 +00:00
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#include "libavutil/opt.h"
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2012-06-11 19:41:03 +00:00
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2007-07-15 18:24:26 +00:00
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#include <zlib.h>
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2007-07-15 19:23:55 +00:00
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#define IOBUF_SIZE 4096
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typedef struct PNGEncContext {
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2013-05-10 15:45:11 +00:00
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AVClass *class;
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2008-02-25 10:34:23 +00:00
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DSPContext dsp;
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2007-07-15 19:23:55 +00:00
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uint8_t *bytestream;
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uint8_t *bytestream_start;
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uint8_t *bytestream_end;
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AVFrame picture;
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2008-02-25 10:34:23 +00:00
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int filter_type;
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2007-07-15 19:23:55 +00:00
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z_stream zstream;
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uint8_t buf[IOBUF_SIZE];
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2013-05-10 15:45:11 +00:00
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int dpi; ///< Physical pixel density, in dots per inch, if set
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int dpm; ///< Physical pixel density, in dots per meter, if set
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2007-07-15 19:23:55 +00:00
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} PNGEncContext;
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2007-07-15 18:24:26 +00:00
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static void png_get_interlaced_row(uint8_t *dst, int row_size,
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int bits_per_pixel, int pass,
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const uint8_t *src, int width)
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{
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int x, mask, dst_x, j, b, bpp;
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uint8_t *d;
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const uint8_t *s;
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2013-04-16 22:37:05 +00:00
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static const int masks[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
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2007-07-15 18:24:26 +00:00
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2013-04-16 22:37:05 +00:00
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mask = masks[pass];
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2007-07-15 18:24:26 +00:00
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switch(bits_per_pixel) {
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case 1:
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memset(dst, 0, row_size);
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dst_x = 0;
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for(x = 0; x < width; x++) {
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j = (x & 7);
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if ((mask << j) & 0x80) {
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b = (src[x >> 3] >> (7 - j)) & 1;
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dst[dst_x >> 3] |= b << (7 - (dst_x & 7));
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dst_x++;
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}
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}
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break;
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default:
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bpp = bits_per_pixel >> 3;
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d = dst;
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s = src;
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for(x = 0; x < width; x++) {
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j = x & 7;
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if ((mask << j) & 0x80) {
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memcpy(d, s, bpp);
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d += bpp;
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}
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s += bpp;
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}
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break;
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}
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}
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2008-02-25 10:34:23 +00:00
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static void sub_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
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{
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int i;
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for(i = 0; i < w; i++) {
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int a, b, c, p, pa, pb, pc;
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a = src[i - bpp];
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b = top[i];
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c = top[i - bpp];
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p = b - c;
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pc = a - c;
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pa = abs(p);
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pb = abs(pc);
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pc = abs(p + pc);
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if (pa <= pb && pa <= pc)
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p = a;
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else if (pb <= pc)
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p = b;
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else
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p = c;
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dst[i] = src[i] - p;
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}
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}
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static void png_filter_row(DSPContext *dsp, uint8_t *dst, int filter_type,
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uint8_t *src, uint8_t *top, int size, int bpp)
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{
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int i;
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switch(filter_type) {
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case PNG_FILTER_VALUE_NONE:
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memcpy(dst, src, size);
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break;
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case PNG_FILTER_VALUE_SUB:
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dsp->diff_bytes(dst, src, src-bpp, size);
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memcpy(dst, src, bpp);
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break;
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case PNG_FILTER_VALUE_UP:
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dsp->diff_bytes(dst, src, top, size);
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break;
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case PNG_FILTER_VALUE_AVG:
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for(i = 0; i < bpp; i++)
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dst[i] = src[i] - (top[i] >> 1);
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for(; i < size; i++)
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dst[i] = src[i] - ((src[i-bpp] + top[i]) >> 1);
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break;
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case PNG_FILTER_VALUE_PAETH:
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for(i = 0; i < bpp; i++)
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dst[i] = src[i] - top[i];
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sub_png_paeth_prediction(dst+i, src+i, top+i, size-i, bpp);
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break;
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}
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}
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static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
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uint8_t *src, uint8_t *top, int size, int bpp)
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{
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int pred = s->filter_type;
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2012-06-11 19:41:03 +00:00
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av_assert0(bpp || !pred);
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2008-02-25 10:34:23 +00:00
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if(!top && pred)
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pred = PNG_FILTER_VALUE_SUB;
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if(pred == PNG_FILTER_VALUE_MIXED) {
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int i;
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int cost, bcost = INT_MAX;
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uint8_t *buf1 = dst, *buf2 = dst + size + 16;
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for(pred=0; pred<5; pred++) {
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png_filter_row(&s->dsp, buf1+1, pred, src, top, size, bpp);
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buf1[0] = pred;
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cost = 0;
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for(i=0; i<=size; i++)
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2008-02-26 07:35:56 +00:00
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cost += abs((int8_t)buf1[i]);
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2008-02-25 10:34:23 +00:00
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if(cost < bcost) {
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bcost = cost;
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FFSWAP(uint8_t*, buf1, buf2);
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}
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}
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return buf2;
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} else {
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png_filter_row(&s->dsp, dst+1, pred, src, top, size, bpp);
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dst[0] = pred;
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return dst;
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}
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}
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2007-07-15 18:24:26 +00:00
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static void png_write_chunk(uint8_t **f, uint32_t tag,
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const uint8_t *buf, int length)
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{
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uint32_t crc;
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uint8_t tagbuf[4];
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bytestream_put_be32(f, length);
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crc = crc32(0, Z_NULL, 0);
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AV_WL32(tagbuf, tag);
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crc = crc32(crc, tagbuf, 4);
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2010-07-10 22:12:30 +00:00
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bytestream_put_be32(f, av_bswap32(tag));
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2007-07-15 18:24:26 +00:00
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if (length > 0) {
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crc = crc32(crc, buf, length);
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memcpy(*f, buf, length);
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*f += length;
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}
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bytestream_put_be32(f, crc);
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}
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/* XXX: do filtering */
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2007-07-15 19:23:55 +00:00
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static int png_write_row(PNGEncContext *s, const uint8_t *data, int size)
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2007-07-15 18:24:26 +00:00
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{
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int ret;
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s->zstream.avail_in = size;
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s->zstream.next_in = (uint8_t *)data;
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while (s->zstream.avail_in > 0) {
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ret = deflate(&s->zstream, Z_NO_FLUSH);
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if (ret != Z_OK)
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return -1;
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if (s->zstream.avail_out == 0) {
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if(s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
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png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
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s->zstream.avail_out = IOBUF_SIZE;
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s->zstream.next_out = s->buf;
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}
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}
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return 0;
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}
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2012-02-12 08:32:40 +00:00
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *pict, int *got_packet)
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{
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2007-07-15 19:23:55 +00:00
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PNGEncContext *s = avctx->priv_data;
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2008-07-10 11:49:53 +00:00
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AVFrame * const p= &s->picture;
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2007-07-15 18:24:26 +00:00
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int bit_depth, color_type, y, len, row_size, ret, is_progressive;
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2012-03-22 20:09:03 +00:00
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int bits_per_pixel, pass_row_size, enc_row_size;
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int64_t max_packet_size;
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2007-10-09 15:33:19 +00:00
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int compression_level;
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2008-02-25 10:34:23 +00:00
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uint8_t *ptr, *top;
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uint8_t *crow_base = NULL, *crow_buf, *crow;
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uint8_t *progressive_buf = NULL;
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uint8_t *top_buf = NULL;
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2007-07-15 18:24:26 +00:00
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*p = *pict;
|
2011-04-27 23:40:44 +00:00
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p->pict_type= AV_PICTURE_TYPE_I;
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2007-07-15 18:24:26 +00:00
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p->key_frame= 1;
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is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT);
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switch(avctx->pix_fmt) {
|
2012-10-08 18:54:00 +00:00
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case AV_PIX_FMT_RGBA64BE:
|
2012-01-15 21:04:25 +00:00
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bit_depth = 16;
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color_type = PNG_COLOR_TYPE_RGB_ALPHA;
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break;
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2012-10-08 18:54:00 +00:00
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case AV_PIX_FMT_RGB48BE:
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2012-01-15 21:04:25 +00:00
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bit_depth = 16;
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color_type = PNG_COLOR_TYPE_RGB;
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break;
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2012-10-08 18:54:00 +00:00
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case AV_PIX_FMT_RGBA:
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2007-07-15 18:24:26 +00:00
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bit_depth = 8;
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color_type = PNG_COLOR_TYPE_RGB_ALPHA;
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break;
|
2012-10-06 10:10:34 +00:00
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case AV_PIX_FMT_RGB24:
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2007-07-15 18:24:26 +00:00
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bit_depth = 8;
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color_type = PNG_COLOR_TYPE_RGB;
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break;
|
2012-10-08 18:54:00 +00:00
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case AV_PIX_FMT_GRAY16BE:
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2012-01-15 20:57:02 +00:00
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bit_depth = 16;
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color_type = PNG_COLOR_TYPE_GRAY;
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break;
|
2012-10-06 10:10:34 +00:00
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case AV_PIX_FMT_GRAY8:
|
2007-07-15 18:24:26 +00:00
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bit_depth = 8;
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color_type = PNG_COLOR_TYPE_GRAY;
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break;
|
2012-10-08 18:54:00 +00:00
|
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case AV_PIX_FMT_GRAY8A:
|
2012-01-15 20:53:01 +00:00
|
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bit_depth = 8;
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color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
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break;
|
2012-10-06 10:10:34 +00:00
|
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case AV_PIX_FMT_MONOBLACK:
|
2007-07-15 18:24:26 +00:00
|
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bit_depth = 1;
|
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color_type = PNG_COLOR_TYPE_GRAY;
|
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break;
|
2012-10-06 10:10:34 +00:00
|
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case AV_PIX_FMT_PAL8:
|
2007-07-15 18:24:26 +00:00
|
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bit_depth = 8;
|
|
|
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color_type = PNG_COLOR_TYPE_PALETTE;
|
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break;
|
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|
|
default:
|
|
|
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return -1;
|
|
|
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}
|
|
|
|
bits_per_pixel = ff_png_get_nb_channels(color_type) * bit_depth;
|
|
|
|
row_size = (avctx->width * bits_per_pixel + 7) >> 3;
|
|
|
|
|
|
|
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s->zstream.zalloc = ff_png_zalloc;
|
|
|
|
s->zstream.zfree = ff_png_zfree;
|
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|
|
s->zstream.opaque = NULL;
|
2007-10-09 15:33:19 +00:00
|
|
|
compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
|
|
|
|
Z_DEFAULT_COMPRESSION :
|
|
|
|
av_clip(avctx->compression_level, 0, 9);
|
|
|
|
ret = deflateInit2(&s->zstream, compression_level,
|
2007-07-15 18:24:26 +00:00
|
|
|
Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
|
|
|
|
if (ret != Z_OK)
|
|
|
|
return -1;
|
2012-03-21 08:48:26 +00:00
|
|
|
|
|
|
|
enc_row_size = deflateBound(&s->zstream, row_size);
|
2012-03-22 20:09:03 +00:00
|
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|
max_packet_size = avctx->height * (int64_t)(enc_row_size +
|
2012-03-21 08:48:26 +00:00
|
|
|
((enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) * 12)
|
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|
+ FF_MIN_BUFFER_SIZE;
|
2012-03-22 20:09:03 +00:00
|
|
|
if (max_packet_size > INT_MAX)
|
|
|
|
return AVERROR(ENOMEM);
|
2012-03-22 20:22:39 +00:00
|
|
|
if ((ret = ff_alloc_packet2(avctx, pkt, max_packet_size)) < 0)
|
2012-03-21 08:48:26 +00:00
|
|
|
return ret;
|
|
|
|
|
|
|
|
s->bytestream_start =
|
|
|
|
s->bytestream = pkt->data;
|
|
|
|
s->bytestream_end = pkt->data + pkt->size;
|
|
|
|
|
2008-02-25 10:34:23 +00:00
|
|
|
crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
|
|
|
|
if (!crow_base)
|
2007-07-15 18:24:26 +00:00
|
|
|
goto fail;
|
2008-02-25 10:34:23 +00:00
|
|
|
crow_buf = crow_base + 15; // pixel data should be aligned, but there's a control byte before it
|
2007-07-15 18:24:26 +00:00
|
|
|
if (is_progressive) {
|
2008-02-25 10:34:23 +00:00
|
|
|
progressive_buf = av_malloc(row_size + 1);
|
|
|
|
if (!progressive_buf)
|
|
|
|
goto fail;
|
|
|
|
}
|
2012-01-15 21:00:11 +00:00
|
|
|
if (is_progressive) {
|
2008-02-25 10:34:23 +00:00
|
|
|
top_buf = av_malloc(row_size + 1);
|
|
|
|
if (!top_buf)
|
2007-07-15 18:24:26 +00:00
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* write png header */
|
2012-06-14 23:18:07 +00:00
|
|
|
AV_WB64(s->bytestream, PNGSIG);
|
2007-07-15 18:24:26 +00:00
|
|
|
s->bytestream += 8;
|
|
|
|
|
|
|
|
AV_WB32(s->buf, avctx->width);
|
|
|
|
AV_WB32(s->buf + 4, avctx->height);
|
|
|
|
s->buf[8] = bit_depth;
|
|
|
|
s->buf[9] = color_type;
|
|
|
|
s->buf[10] = 0; /* compression type */
|
|
|
|
s->buf[11] = 0; /* filter type */
|
|
|
|
s->buf[12] = is_progressive; /* interlace type */
|
|
|
|
|
|
|
|
png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
|
|
|
|
|
2013-05-10 15:45:11 +00:00
|
|
|
if (s->dpm) {
|
|
|
|
AV_WB32(s->buf, s->dpm);
|
|
|
|
AV_WB32(s->buf + 4, s->dpm);
|
|
|
|
s->buf[8] = 1; /* unit specifier is meter */
|
|
|
|
} else {
|
|
|
|
AV_WB32(s->buf, avctx->sample_aspect_ratio.num);
|
|
|
|
AV_WB32(s->buf + 4, avctx->sample_aspect_ratio.den);
|
|
|
|
s->buf[8] = 0; /* unit specifier is unknown */
|
|
|
|
}
|
2012-10-13 09:26:09 +00:00
|
|
|
png_write_chunk(&s->bytestream, MKTAG('p', 'H', 'Y', 's'), s->buf, 9);
|
|
|
|
|
2007-07-15 18:24:26 +00:00
|
|
|
/* put the palette if needed */
|
|
|
|
if (color_type == PNG_COLOR_TYPE_PALETTE) {
|
|
|
|
int has_alpha, alpha, i;
|
|
|
|
unsigned int v;
|
|
|
|
uint32_t *palette;
|
|
|
|
uint8_t *alpha_ptr;
|
|
|
|
|
|
|
|
palette = (uint32_t *)p->data[1];
|
|
|
|
ptr = s->buf;
|
|
|
|
alpha_ptr = s->buf + 256 * 3;
|
|
|
|
has_alpha = 0;
|
|
|
|
for(i = 0; i < 256; i++) {
|
|
|
|
v = palette[i];
|
|
|
|
alpha = v >> 24;
|
2011-12-07 10:31:27 +00:00
|
|
|
if (alpha != 0xff)
|
2007-07-15 18:24:26 +00:00
|
|
|
has_alpha = 1;
|
|
|
|
*alpha_ptr++ = alpha;
|
|
|
|
bytestream_put_be24(&ptr, v);
|
|
|
|
}
|
|
|
|
png_write_chunk(&s->bytestream, MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
|
|
|
|
if (has_alpha) {
|
|
|
|
png_write_chunk(&s->bytestream, MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now put each row */
|
|
|
|
s->zstream.avail_out = IOBUF_SIZE;
|
|
|
|
s->zstream.next_out = s->buf;
|
|
|
|
if (is_progressive) {
|
|
|
|
int pass;
|
|
|
|
|
|
|
|
for(pass = 0; pass < NB_PASSES; pass++) {
|
2012-12-19 17:48:21 +00:00
|
|
|
/* NOTE: a pass is completely omitted if no pixels would be
|
2007-07-15 18:24:26 +00:00
|
|
|
output */
|
|
|
|
pass_row_size = ff_png_pass_row_size(pass, bits_per_pixel, avctx->width);
|
|
|
|
if (pass_row_size > 0) {
|
2008-02-25 10:34:23 +00:00
|
|
|
top = NULL;
|
2007-07-15 18:24:26 +00:00
|
|
|
for(y = 0; y < avctx->height; y++) {
|
|
|
|
if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
|
|
|
|
ptr = p->data[0] + y * p->linesize[0];
|
2008-02-25 10:34:23 +00:00
|
|
|
FFSWAP(uint8_t*, progressive_buf, top_buf);
|
|
|
|
png_get_interlaced_row(progressive_buf, pass_row_size,
|
2007-07-15 18:24:26 +00:00
|
|
|
bits_per_pixel, pass,
|
2008-02-25 10:34:23 +00:00
|
|
|
ptr, avctx->width);
|
|
|
|
crow = png_choose_filter(s, crow_buf, progressive_buf, top, pass_row_size, bits_per_pixel>>3);
|
|
|
|
png_write_row(s, crow, pass_row_size + 1);
|
|
|
|
top = progressive_buf;
|
2007-07-15 18:24:26 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
2008-02-25 10:34:23 +00:00
|
|
|
top = NULL;
|
2007-07-15 18:24:26 +00:00
|
|
|
for(y = 0; y < avctx->height; y++) {
|
|
|
|
ptr = p->data[0] + y * p->linesize[0];
|
2008-02-25 10:34:23 +00:00
|
|
|
crow = png_choose_filter(s, crow_buf, ptr, top, row_size, bits_per_pixel>>3);
|
|
|
|
png_write_row(s, crow, row_size + 1);
|
|
|
|
top = ptr;
|
2007-07-15 18:24:26 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
/* compress last bytes */
|
|
|
|
for(;;) {
|
|
|
|
ret = deflate(&s->zstream, Z_FINISH);
|
|
|
|
if (ret == Z_OK || ret == Z_STREAM_END) {
|
|
|
|
len = IOBUF_SIZE - s->zstream.avail_out;
|
|
|
|
if (len > 0 && s->bytestream_end - s->bytestream > len + 100) {
|
|
|
|
png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len);
|
|
|
|
}
|
|
|
|
s->zstream.avail_out = IOBUF_SIZE;
|
|
|
|
s->zstream.next_out = s->buf;
|
|
|
|
if (ret == Z_STREAM_END)
|
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0);
|
|
|
|
|
2012-02-12 08:32:40 +00:00
|
|
|
pkt->size = s->bytestream - s->bytestream_start;
|
|
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
|
|
*got_packet = 1;
|
|
|
|
ret = 0;
|
|
|
|
|
2007-07-15 18:24:26 +00:00
|
|
|
the_end:
|
2008-02-25 10:34:23 +00:00
|
|
|
av_free(crow_base);
|
|
|
|
av_free(progressive_buf);
|
|
|
|
av_free(top_buf);
|
2007-07-15 18:24:26 +00:00
|
|
|
deflateEnd(&s->zstream);
|
|
|
|
return ret;
|
|
|
|
fail:
|
|
|
|
ret = -1;
|
|
|
|
goto the_end;
|
|
|
|
}
|
|
|
|
|
2008-03-21 03:11:20 +00:00
|
|
|
static av_cold int png_enc_init(AVCodecContext *avctx){
|
2007-07-15 19:23:55 +00:00
|
|
|
PNGEncContext *s = avctx->priv_data;
|
|
|
|
|
2013-02-20 21:54:21 +00:00
|
|
|
switch(avctx->pix_fmt) {
|
|
|
|
case AV_PIX_FMT_RGBA:
|
|
|
|
avctx->bits_per_coded_sample = 32;
|
|
|
|
break;
|
|
|
|
case AV_PIX_FMT_RGB24:
|
|
|
|
avctx->bits_per_coded_sample = 24;
|
|
|
|
break;
|
|
|
|
case AV_PIX_FMT_GRAY8:
|
|
|
|
avctx->bits_per_coded_sample = 0x28;
|
|
|
|
break;
|
|
|
|
case AV_PIX_FMT_MONOBLACK:
|
|
|
|
avctx->bits_per_coded_sample = 1;
|
|
|
|
break;
|
|
|
|
case AV_PIX_FMT_PAL8:
|
|
|
|
avctx->bits_per_coded_sample = 8;
|
|
|
|
}
|
|
|
|
|
2008-07-10 11:49:53 +00:00
|
|
|
avcodec_get_frame_defaults(&s->picture);
|
|
|
|
avctx->coded_frame= &s->picture;
|
2012-02-15 10:06:44 +00:00
|
|
|
ff_dsputil_init(&s->dsp, avctx);
|
2008-02-25 10:34:23 +00:00
|
|
|
|
|
|
|
s->filter_type = av_clip(avctx->prediction_method, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED);
|
2012-10-06 10:10:34 +00:00
|
|
|
if(avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
|
2008-02-25 10:34:23 +00:00
|
|
|
s->filter_type = PNG_FILTER_VALUE_NONE;
|
2007-07-15 19:23:55 +00:00
|
|
|
|
2013-05-10 15:45:11 +00:00
|
|
|
if (s->dpi && s->dpm) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "Only one of 'dpi' or 'dpm' options should be set\n");
|
|
|
|
return AVERROR(EINVAL);
|
|
|
|
} else if (s->dpi) {
|
|
|
|
s->dpm = s->dpi * 10000 / 254;
|
|
|
|
}
|
|
|
|
|
2007-07-15 19:23:55 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-05-10 15:45:11 +00:00
|
|
|
#define OFFSET(x) offsetof(PNGEncContext, x)
|
|
|
|
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
|
|
|
|
static const AVOption options[] = {
|
|
|
|
{"dpi", "Set image resolution (in dots per inch)", OFFSET(dpi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
|
|
|
|
{"dpm", "Set image resolution (in dots per meter)", OFFSET(dpm), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
|
|
|
|
{ NULL }
|
|
|
|
};
|
|
|
|
|
|
|
|
static const AVClass pngenc_class = {
|
|
|
|
.class_name = "PNG encoder",
|
|
|
|
.item_name = av_default_item_name,
|
|
|
|
.option = options,
|
|
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
|
|
};
|
|
|
|
|
2011-01-25 21:40:11 +00:00
|
|
|
AVCodec ff_png_encoder = {
|
2011-07-17 10:54:31 +00:00
|
|
|
.name = "png",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
2012-08-05 09:11:04 +00:00
|
|
|
.id = AV_CODEC_ID_PNG,
|
2011-07-17 10:54:31 +00:00
|
|
|
.priv_data_size = sizeof(PNGEncContext),
|
|
|
|
.init = png_enc_init,
|
2012-02-12 08:32:40 +00:00
|
|
|
.encode2 = encode_frame,
|
2012-09-10 05:40:41 +00:00
|
|
|
.capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
|
2012-10-06 10:10:34 +00:00
|
|
|
.pix_fmts = (const enum AVPixelFormat[]){
|
2012-10-08 18:54:00 +00:00
|
|
|
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
|
|
|
|
AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
|
|
|
|
AV_PIX_FMT_PAL8,
|
|
|
|
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
|
|
|
|
AV_PIX_FMT_GRAY16BE,
|
2012-10-06 10:10:34 +00:00
|
|
|
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
|
2012-04-06 16:19:39 +00:00
|
|
|
},
|
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
|
2013-05-10 15:45:11 +00:00
|
|
|
.priv_class = &pngenc_class,
|
2007-07-15 18:24:26 +00:00
|
|
|
};
|