mirror of
https://git.ffmpeg.org/ffmpeg.git
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5d9f44da46
Monowhite pixel format is not supported, and it does not make sense to add support for it. Fixes #7989
1181 lines
39 KiB
C
1181 lines
39 KiB
C
/*
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* PNG image format
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* Copyright (c) 2003 Fabrice Bellard
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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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#include "internal.h"
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#include "bytestream.h"
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#include "lossless_videoencdsp.h"
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#include "png.h"
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#include "apng.h"
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#include "libavutil/avassert.h"
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#include "libavutil/crc.h"
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#include "libavutil/libm.h"
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#include "libavutil/opt.h"
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#include "libavutil/color_utils.h"
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#include "libavutil/stereo3d.h"
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#include <zlib.h>
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#define IOBUF_SIZE 4096
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typedef struct APNGFctlChunk {
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uint32_t sequence_number;
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uint32_t width, height;
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uint32_t x_offset, y_offset;
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uint16_t delay_num, delay_den;
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uint8_t dispose_op, blend_op;
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} APNGFctlChunk;
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typedef struct PNGEncContext {
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AVClass *class;
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LLVidEncDSPContext llvidencdsp;
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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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int filter_type;
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z_stream zstream;
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uint8_t buf[IOBUF_SIZE];
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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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int is_progressive;
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int bit_depth;
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int color_type;
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int bits_per_pixel;
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// APNG
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uint32_t palette_checksum; // Used to ensure a single unique palette
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uint32_t sequence_number;
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int extra_data_updated;
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uint8_t *extra_data;
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int extra_data_size;
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AVFrame *prev_frame;
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AVFrame *last_frame;
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APNGFctlChunk last_frame_fctl;
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uint8_t *last_frame_packet;
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size_t last_frame_packet_size;
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} PNGEncContext;
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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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static const int masks[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
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mask = masks[pass];
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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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static void sub_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
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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 sub_left_prediction(PNGEncContext *c, uint8_t *dst, const uint8_t *src, int bpp, int size)
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{
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const uint8_t *src1 = src + bpp;
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const uint8_t *src2 = src;
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int x, unaligned_w;
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memcpy(dst, src, bpp);
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dst += bpp;
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size -= bpp;
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unaligned_w = FFMIN(32 - bpp, size);
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for (x = 0; x < unaligned_w; x++)
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*dst++ = *src1++ - *src2++;
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size -= unaligned_w;
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c->llvidencdsp.diff_bytes(dst, src1, src2, size);
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}
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static void png_filter_row(PNGEncContext *c, 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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sub_left_prediction(c, dst, src, bpp, size);
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break;
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case PNG_FILTER_VALUE_UP:
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c->llvidencdsp.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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av_assert0(bpp || !pred);
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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, 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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cost += abs((int8_t) buf1[i]);
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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, 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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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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const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
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uint32_t crc = ~0U;
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uint8_t tagbuf[4];
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bytestream_put_be32(f, length);
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AV_WL32(tagbuf, tag);
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crc = av_crc(crc_table, crc, tagbuf, 4);
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bytestream_put_be32(f, av_bswap32(tag));
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if (length > 0) {
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crc = av_crc(crc_table, 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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static void png_write_image_data(AVCodecContext *avctx,
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const uint8_t *buf, int length)
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{
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PNGEncContext *s = avctx->priv_data;
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const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
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uint32_t crc = ~0U;
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if (avctx->codec_id == AV_CODEC_ID_PNG || avctx->frame_number == 0) {
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png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), buf, length);
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return;
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}
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bytestream_put_be32(&s->bytestream, length + 4);
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bytestream_put_be32(&s->bytestream, MKBETAG('f', 'd', 'A', 'T'));
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bytestream_put_be32(&s->bytestream, s->sequence_number);
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crc = av_crc(crc_table, crc, s->bytestream - 8, 8);
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crc = av_crc(crc_table, crc, buf, length);
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memcpy(s->bytestream, buf, length);
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s->bytestream += length;
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bytestream_put_be32(&s->bytestream, ~crc);
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++s->sequence_number;
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}
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/* XXX: do filtering */
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static int png_write_row(AVCodecContext *avctx, const uint8_t *data, int size)
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{
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PNGEncContext *s = avctx->priv_data;
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int ret;
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s->zstream.avail_in = size;
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s->zstream.next_in = 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_image_data(avctx, 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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#define AV_WB32_PNG(buf, n) AV_WB32(buf, lrint((n) * 100000))
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static int png_get_chrm(enum AVColorPrimaries prim, uint8_t *buf)
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{
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double rx, ry, gx, gy, bx, by, wx = 0.3127, wy = 0.3290;
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switch (prim) {
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case AVCOL_PRI_BT709:
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rx = 0.640; ry = 0.330;
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gx = 0.300; gy = 0.600;
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bx = 0.150; by = 0.060;
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break;
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case AVCOL_PRI_BT470M:
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rx = 0.670; ry = 0.330;
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gx = 0.210; gy = 0.710;
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bx = 0.140; by = 0.080;
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wx = 0.310; wy = 0.316;
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break;
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case AVCOL_PRI_BT470BG:
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rx = 0.640; ry = 0.330;
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gx = 0.290; gy = 0.600;
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bx = 0.150; by = 0.060;
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break;
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case AVCOL_PRI_SMPTE170M:
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case AVCOL_PRI_SMPTE240M:
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rx = 0.630; ry = 0.340;
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gx = 0.310; gy = 0.595;
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bx = 0.155; by = 0.070;
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break;
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case AVCOL_PRI_BT2020:
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rx = 0.708; ry = 0.292;
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gx = 0.170; gy = 0.797;
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bx = 0.131; by = 0.046;
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break;
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default:
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return 0;
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}
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AV_WB32_PNG(buf , wx); AV_WB32_PNG(buf + 4 , wy);
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AV_WB32_PNG(buf + 8 , rx); AV_WB32_PNG(buf + 12, ry);
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AV_WB32_PNG(buf + 16, gx); AV_WB32_PNG(buf + 20, gy);
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AV_WB32_PNG(buf + 24, bx); AV_WB32_PNG(buf + 28, by);
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return 1;
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}
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static int png_get_gama(enum AVColorTransferCharacteristic trc, uint8_t *buf)
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{
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double gamma = avpriv_get_gamma_from_trc(trc);
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if (gamma <= 1e-6)
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return 0;
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AV_WB32_PNG(buf, 1.0 / gamma);
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return 1;
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}
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static int encode_headers(AVCodecContext *avctx, const AVFrame *pict)
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{
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AVFrameSideData *side_data;
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PNGEncContext *s = avctx->priv_data;
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/* write png header */
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AV_WB32(s->buf, avctx->width);
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AV_WB32(s->buf + 4, avctx->height);
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s->buf[8] = s->bit_depth;
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s->buf[9] = s->color_type;
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s->buf[10] = 0; /* compression type */
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s->buf[11] = 0; /* filter type */
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s->buf[12] = s->is_progressive; /* interlace type */
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png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
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/* write physical information */
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if (s->dpm) {
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AV_WB32(s->buf, s->dpm);
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AV_WB32(s->buf + 4, s->dpm);
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s->buf[8] = 1; /* unit specifier is meter */
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} else {
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AV_WB32(s->buf, avctx->sample_aspect_ratio.num);
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AV_WB32(s->buf + 4, avctx->sample_aspect_ratio.den);
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s->buf[8] = 0; /* unit specifier is unknown */
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}
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png_write_chunk(&s->bytestream, MKTAG('p', 'H', 'Y', 's'), s->buf, 9);
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/* write stereoscopic information */
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side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_STEREO3D);
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if (side_data) {
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AVStereo3D *stereo3d = (AVStereo3D *)side_data->data;
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switch (stereo3d->type) {
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case AV_STEREO3D_SIDEBYSIDE:
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s->buf[0] = ((stereo3d->flags & AV_STEREO3D_FLAG_INVERT) == 0) ? 1 : 0;
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png_write_chunk(&s->bytestream, MKTAG('s', 'T', 'E', 'R'), s->buf, 1);
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break;
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case AV_STEREO3D_2D:
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break;
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default:
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av_log(avctx, AV_LOG_WARNING, "Only side-by-side stereo3d flag can be defined within sTER chunk\n");
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break;
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}
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}
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/* write colorspace information */
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if (pict->color_primaries == AVCOL_PRI_BT709 &&
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pict->color_trc == AVCOL_TRC_IEC61966_2_1) {
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s->buf[0] = 1; /* rendering intent, relative colorimetric by default */
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png_write_chunk(&s->bytestream, MKTAG('s', 'R', 'G', 'B'), s->buf, 1);
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}
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if (png_get_chrm(pict->color_primaries, s->buf))
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png_write_chunk(&s->bytestream, MKTAG('c', 'H', 'R', 'M'), s->buf, 32);
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if (png_get_gama(pict->color_trc, s->buf))
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png_write_chunk(&s->bytestream, MKTAG('g', 'A', 'M', 'A'), s->buf, 4);
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/* put the palette if needed */
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if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
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int has_alpha, alpha, i;
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unsigned int v;
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uint32_t *palette;
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uint8_t *ptr, *alpha_ptr;
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palette = (uint32_t *)pict->data[1];
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ptr = s->buf;
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alpha_ptr = s->buf + 256 * 3;
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has_alpha = 0;
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for (i = 0; i < 256; i++) {
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v = palette[i];
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alpha = v >> 24;
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if (alpha != 0xff)
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has_alpha = 1;
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*alpha_ptr++ = alpha;
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bytestream_put_be24(&ptr, v);
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}
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png_write_chunk(&s->bytestream,
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MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
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if (has_alpha) {
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png_write_chunk(&s->bytestream,
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MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
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}
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}
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return 0;
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}
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static int encode_frame(AVCodecContext *avctx, const AVFrame *pict)
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{
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PNGEncContext *s = avctx->priv_data;
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const AVFrame *const p = pict;
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int y, len, ret;
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int row_size, pass_row_size;
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uint8_t *ptr, *top, *crow_buf, *crow;
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uint8_t *crow_base = NULL;
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uint8_t *progressive_buf = NULL;
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uint8_t *top_buf = NULL;
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row_size = (pict->width * s->bits_per_pixel + 7) >> 3;
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crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
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if (!crow_base) {
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ret = AVERROR(ENOMEM);
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goto the_end;
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}
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// pixel data should be aligned, but there's a control byte before it
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crow_buf = crow_base + 15;
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if (s->is_progressive) {
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progressive_buf = av_malloc(row_size + 1);
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top_buf = av_malloc(row_size + 1);
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if (!progressive_buf || !top_buf) {
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ret = AVERROR(ENOMEM);
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goto the_end;
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}
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}
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/* put each row */
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s->zstream.avail_out = IOBUF_SIZE;
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s->zstream.next_out = s->buf;
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if (s->is_progressive) {
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int pass;
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|
|
for (pass = 0; pass < NB_PASSES; pass++) {
|
|
/* NOTE: a pass is completely omitted if no pixels would be
|
|
* output */
|
|
pass_row_size = ff_png_pass_row_size(pass, s->bits_per_pixel, pict->width);
|
|
if (pass_row_size > 0) {
|
|
top = NULL;
|
|
for (y = 0; y < pict->height; y++)
|
|
if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
|
|
ptr = p->data[0] + y * p->linesize[0];
|
|
FFSWAP(uint8_t *, progressive_buf, top_buf);
|
|
png_get_interlaced_row(progressive_buf, pass_row_size,
|
|
s->bits_per_pixel, pass,
|
|
ptr, pict->width);
|
|
crow = png_choose_filter(s, crow_buf, progressive_buf,
|
|
top, pass_row_size, s->bits_per_pixel >> 3);
|
|
png_write_row(avctx, crow, pass_row_size + 1);
|
|
top = progressive_buf;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
top = NULL;
|
|
for (y = 0; y < pict->height; y++) {
|
|
ptr = p->data[0] + y * p->linesize[0];
|
|
crow = png_choose_filter(s, crow_buf, ptr, top,
|
|
row_size, s->bits_per_pixel >> 3);
|
|
png_write_row(avctx, crow, row_size + 1);
|
|
top = ptr;
|
|
}
|
|
}
|
|
/* 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_image_data(avctx, s->buf, len);
|
|
}
|
|
s->zstream.avail_out = IOBUF_SIZE;
|
|
s->zstream.next_out = s->buf;
|
|
if (ret == Z_STREAM_END)
|
|
break;
|
|
} else {
|
|
ret = -1;
|
|
goto the_end;
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
the_end:
|
|
av_freep(&crow_base);
|
|
av_freep(&progressive_buf);
|
|
av_freep(&top_buf);
|
|
deflateReset(&s->zstream);
|
|
return ret;
|
|
}
|
|
|
|
static int encode_png(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *pict, int *got_packet)
|
|
{
|
|
PNGEncContext *s = avctx->priv_data;
|
|
int ret;
|
|
int enc_row_size;
|
|
size_t max_packet_size;
|
|
|
|
enc_row_size = deflateBound(&s->zstream, (avctx->width * s->bits_per_pixel + 7) >> 3);
|
|
max_packet_size =
|
|
AV_INPUT_BUFFER_MIN_SIZE + // headers
|
|
avctx->height * (
|
|
enc_row_size +
|
|
12 * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // IDAT * ceil(enc_row_size / IOBUF_SIZE)
|
|
);
|
|
if (max_packet_size > INT_MAX)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_alloc_packet2(avctx, pkt, max_packet_size, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
s->bytestream_start =
|
|
s->bytestream = pkt->data;
|
|
s->bytestream_end = pkt->data + pkt->size;
|
|
|
|
AV_WB64(s->bytestream, PNGSIG);
|
|
s->bytestream += 8;
|
|
|
|
ret = encode_headers(avctx, pict);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = encode_frame(avctx, pict);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0);
|
|
|
|
pkt->size = s->bytestream - s->bytestream_start;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
*got_packet = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apng_do_inverse_blend(AVFrame *output, const AVFrame *input,
|
|
APNGFctlChunk *fctl_chunk, uint8_t bpp)
|
|
{
|
|
// output: background, input: foreground
|
|
// output the image such that when blended with the background, will produce the foreground
|
|
|
|
unsigned int x, y;
|
|
unsigned int leftmost_x = input->width;
|
|
unsigned int rightmost_x = 0;
|
|
unsigned int topmost_y = input->height;
|
|
unsigned int bottommost_y = 0;
|
|
const uint8_t *input_data = input->data[0];
|
|
uint8_t *output_data = output->data[0];
|
|
ptrdiff_t input_linesize = input->linesize[0];
|
|
ptrdiff_t output_linesize = output->linesize[0];
|
|
|
|
// Find bounding box of changes
|
|
for (y = 0; y < input->height; ++y) {
|
|
for (x = 0; x < input->width; ++x) {
|
|
if (!memcmp(input_data + bpp * x, output_data + bpp * x, bpp))
|
|
continue;
|
|
|
|
if (x < leftmost_x)
|
|
leftmost_x = x;
|
|
if (x >= rightmost_x)
|
|
rightmost_x = x + 1;
|
|
if (y < topmost_y)
|
|
topmost_y = y;
|
|
if (y >= bottommost_y)
|
|
bottommost_y = y + 1;
|
|
}
|
|
|
|
input_data += input_linesize;
|
|
output_data += output_linesize;
|
|
}
|
|
|
|
if (leftmost_x == input->width && rightmost_x == 0) {
|
|
// Empty frame
|
|
// APNG does not support empty frames, so we make it a 1x1 frame
|
|
leftmost_x = topmost_y = 0;
|
|
rightmost_x = bottommost_y = 1;
|
|
}
|
|
|
|
// Do actual inverse blending
|
|
if (fctl_chunk->blend_op == APNG_BLEND_OP_SOURCE) {
|
|
output_data = output->data[0];
|
|
for (y = topmost_y; y < bottommost_y; ++y) {
|
|
memcpy(output_data,
|
|
input->data[0] + input_linesize * y + bpp * leftmost_x,
|
|
bpp * (rightmost_x - leftmost_x));
|
|
output_data += output_linesize;
|
|
}
|
|
} else { // APNG_BLEND_OP_OVER
|
|
size_t transparent_palette_index;
|
|
uint32_t *palette;
|
|
|
|
switch (input->format) {
|
|
case AV_PIX_FMT_RGBA64BE:
|
|
case AV_PIX_FMT_YA16BE:
|
|
case AV_PIX_FMT_RGBA:
|
|
case AV_PIX_FMT_GRAY8A:
|
|
break;
|
|
|
|
case AV_PIX_FMT_PAL8:
|
|
palette = (uint32_t*)input->data[1];
|
|
for (transparent_palette_index = 0; transparent_palette_index < 256; ++transparent_palette_index)
|
|
if (palette[transparent_palette_index] >> 24 == 0)
|
|
break;
|
|
break;
|
|
|
|
default:
|
|
// No alpha, so blending not possible
|
|
return -1;
|
|
}
|
|
|
|
for (y = topmost_y; y < bottommost_y; ++y) {
|
|
uint8_t *foreground = input->data[0] + input_linesize * y + bpp * leftmost_x;
|
|
uint8_t *background = output->data[0] + output_linesize * y + bpp * leftmost_x;
|
|
output_data = output->data[0] + output_linesize * (y - topmost_y);
|
|
for (x = leftmost_x; x < rightmost_x; ++x, foreground += bpp, background += bpp, output_data += bpp) {
|
|
if (!memcmp(foreground, background, bpp)) {
|
|
if (input->format == AV_PIX_FMT_PAL8) {
|
|
if (transparent_palette_index == 256) {
|
|
// Need fully transparent colour, but none exists
|
|
return -1;
|
|
}
|
|
|
|
*output_data = transparent_palette_index;
|
|
} else {
|
|
memset(output_data, 0, bpp);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// Check for special alpha values, since full inverse
|
|
// alpha-on-alpha blending is rarely possible, and when
|
|
// possible, doesn't compress much better than
|
|
// APNG_BLEND_OP_SOURCE blending
|
|
switch (input->format) {
|
|
case AV_PIX_FMT_RGBA64BE:
|
|
if (((uint16_t*)foreground)[3] == 0xffff ||
|
|
((uint16_t*)background)[3] == 0)
|
|
break;
|
|
return -1;
|
|
|
|
case AV_PIX_FMT_YA16BE:
|
|
if (((uint16_t*)foreground)[1] == 0xffff ||
|
|
((uint16_t*)background)[1] == 0)
|
|
break;
|
|
return -1;
|
|
|
|
case AV_PIX_FMT_RGBA:
|
|
if (foreground[3] == 0xff || background[3] == 0)
|
|
break;
|
|
return -1;
|
|
|
|
case AV_PIX_FMT_GRAY8A:
|
|
if (foreground[1] == 0xff || background[1] == 0)
|
|
break;
|
|
return -1;
|
|
|
|
case AV_PIX_FMT_PAL8:
|
|
if (palette[*foreground] >> 24 == 0xff ||
|
|
palette[*background] >> 24 == 0)
|
|
break;
|
|
return -1;
|
|
}
|
|
|
|
memmove(output_data, foreground, bpp);
|
|
}
|
|
}
|
|
}
|
|
|
|
output->width = rightmost_x - leftmost_x;
|
|
output->height = bottommost_y - topmost_y;
|
|
fctl_chunk->width = output->width;
|
|
fctl_chunk->height = output->height;
|
|
fctl_chunk->x_offset = leftmost_x;
|
|
fctl_chunk->y_offset = topmost_y;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apng_encode_frame(AVCodecContext *avctx, const AVFrame *pict,
|
|
APNGFctlChunk *best_fctl_chunk, APNGFctlChunk *best_last_fctl_chunk)
|
|
{
|
|
PNGEncContext *s = avctx->priv_data;
|
|
int ret;
|
|
unsigned int y;
|
|
AVFrame* diffFrame;
|
|
uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
|
|
uint8_t *original_bytestream, *original_bytestream_end;
|
|
uint8_t *temp_bytestream = 0, *temp_bytestream_end;
|
|
uint32_t best_sequence_number;
|
|
uint8_t *best_bytestream;
|
|
size_t best_bytestream_size = SIZE_MAX;
|
|
APNGFctlChunk last_fctl_chunk = *best_last_fctl_chunk;
|
|
APNGFctlChunk fctl_chunk = *best_fctl_chunk;
|
|
|
|
if (avctx->frame_number == 0) {
|
|
best_fctl_chunk->width = pict->width;
|
|
best_fctl_chunk->height = pict->height;
|
|
best_fctl_chunk->x_offset = 0;
|
|
best_fctl_chunk->y_offset = 0;
|
|
best_fctl_chunk->blend_op = APNG_BLEND_OP_SOURCE;
|
|
return encode_frame(avctx, pict);
|
|
}
|
|
|
|
diffFrame = av_frame_alloc();
|
|
if (!diffFrame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
diffFrame->format = pict->format;
|
|
diffFrame->width = pict->width;
|
|
diffFrame->height = pict->height;
|
|
if ((ret = av_frame_get_buffer(diffFrame, 0)) < 0)
|
|
goto fail;
|
|
|
|
original_bytestream = s->bytestream;
|
|
original_bytestream_end = s->bytestream_end;
|
|
|
|
temp_bytestream = av_malloc(original_bytestream_end - original_bytestream);
|
|
if (!temp_bytestream) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
temp_bytestream_end = temp_bytestream + (original_bytestream_end - original_bytestream);
|
|
|
|
for (last_fctl_chunk.dispose_op = 0; last_fctl_chunk.dispose_op < 3; ++last_fctl_chunk.dispose_op) {
|
|
// 0: APNG_DISPOSE_OP_NONE
|
|
// 1: APNG_DISPOSE_OP_BACKGROUND
|
|
// 2: APNG_DISPOSE_OP_PREVIOUS
|
|
|
|
for (fctl_chunk.blend_op = 0; fctl_chunk.blend_op < 2; ++fctl_chunk.blend_op) {
|
|
// 0: APNG_BLEND_OP_SOURCE
|
|
// 1: APNG_BLEND_OP_OVER
|
|
|
|
uint32_t original_sequence_number = s->sequence_number, sequence_number;
|
|
uint8_t *bytestream_start = s->bytestream;
|
|
size_t bytestream_size;
|
|
|
|
// Do disposal
|
|
if (last_fctl_chunk.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
|
|
diffFrame->width = pict->width;
|
|
diffFrame->height = pict->height;
|
|
ret = av_frame_copy(diffFrame, s->last_frame);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
if (last_fctl_chunk.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
|
|
for (y = last_fctl_chunk.y_offset; y < last_fctl_chunk.y_offset + last_fctl_chunk.height; ++y) {
|
|
size_t row_start = diffFrame->linesize[0] * y + bpp * last_fctl_chunk.x_offset;
|
|
memset(diffFrame->data[0] + row_start, 0, bpp * last_fctl_chunk.width);
|
|
}
|
|
}
|
|
} else {
|
|
if (!s->prev_frame)
|
|
continue;
|
|
|
|
diffFrame->width = pict->width;
|
|
diffFrame->height = pict->height;
|
|
ret = av_frame_copy(diffFrame, s->prev_frame);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
|
|
// Do inverse blending
|
|
if (apng_do_inverse_blend(diffFrame, pict, &fctl_chunk, bpp) < 0)
|
|
continue;
|
|
|
|
// Do encoding
|
|
ret = encode_frame(avctx, diffFrame);
|
|
sequence_number = s->sequence_number;
|
|
s->sequence_number = original_sequence_number;
|
|
bytestream_size = s->bytestream - bytestream_start;
|
|
s->bytestream = bytestream_start;
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
if (bytestream_size < best_bytestream_size) {
|
|
*best_fctl_chunk = fctl_chunk;
|
|
*best_last_fctl_chunk = last_fctl_chunk;
|
|
|
|
best_sequence_number = sequence_number;
|
|
best_bytestream = s->bytestream;
|
|
best_bytestream_size = bytestream_size;
|
|
|
|
if (best_bytestream == original_bytestream) {
|
|
s->bytestream = temp_bytestream;
|
|
s->bytestream_end = temp_bytestream_end;
|
|
} else {
|
|
s->bytestream = original_bytestream;
|
|
s->bytestream_end = original_bytestream_end;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
s->sequence_number = best_sequence_number;
|
|
s->bytestream = original_bytestream + best_bytestream_size;
|
|
s->bytestream_end = original_bytestream_end;
|
|
if (best_bytestream != original_bytestream)
|
|
memcpy(original_bytestream, best_bytestream, best_bytestream_size);
|
|
|
|
ret = 0;
|
|
|
|
fail:
|
|
av_freep(&temp_bytestream);
|
|
av_frame_free(&diffFrame);
|
|
return ret;
|
|
}
|
|
|
|
static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *pict, int *got_packet)
|
|
{
|
|
PNGEncContext *s = avctx->priv_data;
|
|
int ret;
|
|
int enc_row_size;
|
|
size_t max_packet_size;
|
|
APNGFctlChunk fctl_chunk = {0};
|
|
|
|
if (pict && avctx->codec_id == AV_CODEC_ID_APNG && s->color_type == PNG_COLOR_TYPE_PALETTE) {
|
|
uint32_t checksum = ~av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), ~0U, pict->data[1], 256 * sizeof(uint32_t));
|
|
|
|
if (avctx->frame_number == 0) {
|
|
s->palette_checksum = checksum;
|
|
} else if (checksum != s->palette_checksum) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Input contains more than one unique palette. APNG does not support multiple palettes.\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
enc_row_size = deflateBound(&s->zstream, (avctx->width * s->bits_per_pixel + 7) >> 3);
|
|
max_packet_size =
|
|
AV_INPUT_BUFFER_MIN_SIZE + // headers
|
|
avctx->height * (
|
|
enc_row_size +
|
|
(4 + 12) * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // fdAT * ceil(enc_row_size / IOBUF_SIZE)
|
|
);
|
|
if (max_packet_size > INT_MAX)
|
|
return AVERROR(ENOMEM);
|
|
|
|
if (avctx->frame_number == 0) {
|
|
if (!pict)
|
|
return AVERROR(EINVAL);
|
|
|
|
s->bytestream = s->extra_data = av_malloc(AV_INPUT_BUFFER_MIN_SIZE);
|
|
if (!s->extra_data)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ret = encode_headers(avctx, pict);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
s->extra_data_size = s->bytestream - s->extra_data;
|
|
|
|
s->last_frame_packet = av_malloc(max_packet_size);
|
|
if (!s->last_frame_packet)
|
|
return AVERROR(ENOMEM);
|
|
} else if (s->last_frame) {
|
|
ret = ff_alloc_packet2(avctx, pkt, max_packet_size, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
memcpy(pkt->data, s->last_frame_packet, s->last_frame_packet_size);
|
|
pkt->size = s->last_frame_packet_size;
|
|
pkt->pts = pkt->dts = s->last_frame->pts;
|
|
}
|
|
|
|
if (pict) {
|
|
s->bytestream_start =
|
|
s->bytestream = s->last_frame_packet;
|
|
s->bytestream_end = s->bytestream + max_packet_size;
|
|
|
|
// We're encoding the frame first, so we have to do a bit of shuffling around
|
|
// to have the image data write to the correct place in the buffer
|
|
fctl_chunk.sequence_number = s->sequence_number;
|
|
++s->sequence_number;
|
|
s->bytestream += 26 + 12;
|
|
|
|
ret = apng_encode_frame(avctx, pict, &fctl_chunk, &s->last_frame_fctl);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
fctl_chunk.delay_num = 0; // delay filled in during muxing
|
|
fctl_chunk.delay_den = 0;
|
|
} else {
|
|
s->last_frame_fctl.dispose_op = APNG_DISPOSE_OP_NONE;
|
|
}
|
|
|
|
if (s->last_frame) {
|
|
uint8_t* last_fctl_chunk_start = pkt->data;
|
|
uint8_t buf[26];
|
|
if (!s->extra_data_updated) {
|
|
uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, s->extra_data_size);
|
|
if (!side_data)
|
|
return AVERROR(ENOMEM);
|
|
memcpy(side_data, s->extra_data, s->extra_data_size);
|
|
s->extra_data_updated = 1;
|
|
}
|
|
|
|
AV_WB32(buf + 0, s->last_frame_fctl.sequence_number);
|
|
AV_WB32(buf + 4, s->last_frame_fctl.width);
|
|
AV_WB32(buf + 8, s->last_frame_fctl.height);
|
|
AV_WB32(buf + 12, s->last_frame_fctl.x_offset);
|
|
AV_WB32(buf + 16, s->last_frame_fctl.y_offset);
|
|
AV_WB16(buf + 20, s->last_frame_fctl.delay_num);
|
|
AV_WB16(buf + 22, s->last_frame_fctl.delay_den);
|
|
buf[24] = s->last_frame_fctl.dispose_op;
|
|
buf[25] = s->last_frame_fctl.blend_op;
|
|
png_write_chunk(&last_fctl_chunk_start, MKTAG('f', 'c', 'T', 'L'), buf, 26);
|
|
|
|
*got_packet = 1;
|
|
}
|
|
|
|
if (pict) {
|
|
if (!s->last_frame) {
|
|
s->last_frame = av_frame_alloc();
|
|
if (!s->last_frame)
|
|
return AVERROR(ENOMEM);
|
|
} else if (s->last_frame_fctl.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
|
|
if (!s->prev_frame) {
|
|
s->prev_frame = av_frame_alloc();
|
|
if (!s->prev_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
s->prev_frame->format = pict->format;
|
|
s->prev_frame->width = pict->width;
|
|
s->prev_frame->height = pict->height;
|
|
if ((ret = av_frame_get_buffer(s->prev_frame, 0)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
// Do disposal, but not blending
|
|
av_frame_copy(s->prev_frame, s->last_frame);
|
|
if (s->last_frame_fctl.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
|
|
uint32_t y;
|
|
uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
|
|
for (y = s->last_frame_fctl.y_offset; y < s->last_frame_fctl.y_offset + s->last_frame_fctl.height; ++y) {
|
|
size_t row_start = s->prev_frame->linesize[0] * y + bpp * s->last_frame_fctl.x_offset;
|
|
memset(s->prev_frame->data[0] + row_start, 0, bpp * s->last_frame_fctl.width);
|
|
}
|
|
}
|
|
}
|
|
|
|
av_frame_unref(s->last_frame);
|
|
ret = av_frame_ref(s->last_frame, (AVFrame*)pict);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
s->last_frame_fctl = fctl_chunk;
|
|
s->last_frame_packet_size = s->bytestream - s->bytestream_start;
|
|
} else {
|
|
av_frame_free(&s->last_frame);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int png_enc_init(AVCodecContext *avctx)
|
|
{
|
|
PNGEncContext *s = avctx->priv_data;
|
|
int compression_level;
|
|
|
|
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;
|
|
}
|
|
|
|
#if FF_API_CODED_FRAME
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
|
|
avctx->coded_frame->key_frame = 1;
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
|
|
ff_llvidencdsp_init(&s->llvidencdsp);
|
|
|
|
#if FF_API_PRIVATE_OPT
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
if (avctx->prediction_method)
|
|
s->filter_type = av_clip(avctx->prediction_method,
|
|
PNG_FILTER_VALUE_NONE,
|
|
PNG_FILTER_VALUE_MIXED);
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
|
|
if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
|
|
s->filter_type = PNG_FILTER_VALUE_NONE;
|
|
|
|
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;
|
|
}
|
|
|
|
s->is_progressive = !!(avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT);
|
|
switch (avctx->pix_fmt) {
|
|
case AV_PIX_FMT_RGBA64BE:
|
|
s->bit_depth = 16;
|
|
s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
|
|
break;
|
|
case AV_PIX_FMT_RGB48BE:
|
|
s->bit_depth = 16;
|
|
s->color_type = PNG_COLOR_TYPE_RGB;
|
|
break;
|
|
case AV_PIX_FMT_RGBA:
|
|
s->bit_depth = 8;
|
|
s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
|
|
break;
|
|
case AV_PIX_FMT_RGB24:
|
|
s->bit_depth = 8;
|
|
s->color_type = PNG_COLOR_TYPE_RGB;
|
|
break;
|
|
case AV_PIX_FMT_GRAY16BE:
|
|
s->bit_depth = 16;
|
|
s->color_type = PNG_COLOR_TYPE_GRAY;
|
|
break;
|
|
case AV_PIX_FMT_GRAY8:
|
|
s->bit_depth = 8;
|
|
s->color_type = PNG_COLOR_TYPE_GRAY;
|
|
break;
|
|
case AV_PIX_FMT_GRAY8A:
|
|
s->bit_depth = 8;
|
|
s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
|
|
break;
|
|
case AV_PIX_FMT_YA16BE:
|
|
s->bit_depth = 16;
|
|
s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
|
|
break;
|
|
case AV_PIX_FMT_MONOBLACK:
|
|
s->bit_depth = 1;
|
|
s->color_type = PNG_COLOR_TYPE_GRAY;
|
|
break;
|
|
case AV_PIX_FMT_PAL8:
|
|
s->bit_depth = 8;
|
|
s->color_type = PNG_COLOR_TYPE_PALETTE;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
s->bits_per_pixel = ff_png_get_nb_channels(s->color_type) * s->bit_depth;
|
|
|
|
s->zstream.zalloc = ff_png_zalloc;
|
|
s->zstream.zfree = ff_png_zfree;
|
|
s->zstream.opaque = NULL;
|
|
compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT
|
|
? Z_DEFAULT_COMPRESSION
|
|
: av_clip(avctx->compression_level, 0, 9);
|
|
if (deflateInit2(&s->zstream, compression_level, Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY) != Z_OK)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int png_enc_close(AVCodecContext *avctx)
|
|
{
|
|
PNGEncContext *s = avctx->priv_data;
|
|
|
|
deflateEnd(&s->zstream);
|
|
av_frame_free(&s->last_frame);
|
|
av_frame_free(&s->prev_frame);
|
|
av_freep(&s->last_frame_packet);
|
|
av_freep(&s->extra_data);
|
|
s->extra_data_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
#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},
|
|
{ "pred", "Prediction method", OFFSET(filter_type), AV_OPT_TYPE_INT, { .i64 = PNG_FILTER_VALUE_NONE }, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED, VE, "pred" },
|
|
{ "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_NONE }, INT_MIN, INT_MAX, VE, "pred" },
|
|
{ "sub", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_SUB }, INT_MIN, INT_MAX, VE, "pred" },
|
|
{ "up", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_UP }, INT_MIN, INT_MAX, VE, "pred" },
|
|
{ "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_AVG }, INT_MIN, INT_MAX, VE, "pred" },
|
|
{ "paeth", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_PAETH }, INT_MIN, INT_MAX, VE, "pred" },
|
|
{ "mixed", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_MIXED }, INT_MIN, INT_MAX, VE, "pred" },
|
|
{ NULL},
|
|
};
|
|
|
|
static const AVClass pngenc_class = {
|
|
.class_name = "PNG encoder",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
static const AVClass apngenc_class = {
|
|
.class_name = "APNG encoder",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVCodec ff_png_encoder = {
|
|
.name = "png",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PNG,
|
|
.priv_data_size = sizeof(PNGEncContext),
|
|
.init = png_enc_init,
|
|
.close = png_enc_close,
|
|
.encode2 = encode_png,
|
|
.capabilities = AV_CODEC_CAP_FRAME_THREADS,
|
|
.pix_fmts = (const enum AVPixelFormat[]) {
|
|
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, AV_PIX_FMT_YA16BE,
|
|
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
|
|
},
|
|
.priv_class = &pngenc_class,
|
|
};
|
|
|
|
AVCodec ff_apng_encoder = {
|
|
.name = "apng",
|
|
.long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_APNG,
|
|
.priv_data_size = sizeof(PNGEncContext),
|
|
.init = png_enc_init,
|
|
.close = png_enc_close,
|
|
.encode2 = encode_apng,
|
|
.capabilities = AV_CODEC_CAP_DELAY,
|
|
.pix_fmts = (const enum AVPixelFormat[]) {
|
|
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, AV_PIX_FMT_YA16BE,
|
|
AV_PIX_FMT_NONE
|
|
},
|
|
.priv_class = &apngenc_class,
|
|
};
|