mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-28 10:22:10 +00:00
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
|
|
* PNG image format
|
|
* Copyright (c) 2003 Fabrice Bellard
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_PNG_H
|
|
#define AVCODEC_PNG_H
|
|
|
|
#include <stdint.h>
|
|
#include <zlib.h>
|
|
|
|
#include "avcodec.h"
|
|
|
|
#define PNG_COLOR_MASK_PALETTE 1
|
|
#define PNG_COLOR_MASK_COLOR 2
|
|
#define PNG_COLOR_MASK_ALPHA 4
|
|
|
|
#define PNG_COLOR_TYPE_GRAY 0
|
|
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
|
|
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
|
|
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
|
|
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
|
|
|
|
#define PNG_FILTER_TYPE_LOCO 64
|
|
#define PNG_FILTER_VALUE_NONE 0
|
|
#define PNG_FILTER_VALUE_SUB 1
|
|
#define PNG_FILTER_VALUE_UP 2
|
|
#define PNG_FILTER_VALUE_AVG 3
|
|
#define PNG_FILTER_VALUE_PAETH 4
|
|
#define PNG_FILTER_VALUE_MIXED 5
|
|
|
|
#define PNG_IHDR 0x0001
|
|
#define PNG_IDAT 0x0002
|
|
#define PNG_ALLIMAGE 0x0004
|
|
#define PNG_PLTE 0x0008
|
|
|
|
#define NB_PASSES 7
|
|
|
|
extern const uint8_t ff_pngsig[8];
|
|
extern const uint8_t ff_mngsig[8];
|
|
|
|
/* Mask to determine which y pixels are valid in a pass */
|
|
extern const uint8_t ff_png_pass_ymask[NB_PASSES];
|
|
|
|
/* Mask to determine which pixels are valid in a pass */
|
|
extern const uint8_t ff_png_pass_mask[NB_PASSES];
|
|
|
|
void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size);
|
|
|
|
void ff_png_zfree(void *opaque, void *ptr);
|
|
|
|
int ff_png_get_nb_channels(int color_type);
|
|
|
|
/* compute the row size of an interleaved pass */
|
|
int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
|
|
|
|
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
|
|
|
|
typedef struct PNGDecContext {
|
|
const uint8_t *bytestream;
|
|
const uint8_t *bytestream_start;
|
|
const uint8_t *bytestream_end;
|
|
AVFrame picture1, picture2;
|
|
AVFrame *current_picture, *last_picture;
|
|
|
|
int state;
|
|
int width, height;
|
|
int bit_depth;
|
|
int color_type;
|
|
int compression_type;
|
|
int interlace_type;
|
|
int filter_type;
|
|
int channels;
|
|
int bits_per_pixel;
|
|
int bpp;
|
|
|
|
uint8_t *image_buf;
|
|
int image_linesize;
|
|
uint32_t palette[256];
|
|
uint8_t *crow_buf;
|
|
uint8_t *last_row;
|
|
uint8_t *tmp_row;
|
|
int pass;
|
|
int crow_size; /* compressed row size (include filter type) */
|
|
int row_size; /* decompressed row size */
|
|
int pass_row_size; /* decompress row size of the current pass */
|
|
int y;
|
|
z_stream zstream;
|
|
|
|
void (*add_bytes_l2)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w);
|
|
void (*add_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
|
|
} PNGDecContext;
|
|
|
|
void ff_png_init_mmx(PNGDecContext *s);
|
|
|
|
#endif /* AVCODEC_PNG_H */
|