ffmpeg / libavcodec / png.c @ 5509bffa
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| 1 | 4eff7cf4 | Michael Niedermayer | /*
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| 2 | * PNG image format
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| 3 | * Copyright (c) 2003 Fabrice Bellard.
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU Lesser General Public
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| 7 | * License as published by the Free Software Foundation; either
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| 8 | * version 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This library is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | * Lesser General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU Lesser General Public
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| 16 | * License along with this library; if not, write to the Free Software
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| 17 | 5509bffa | Diego Biurrun | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 18 | 4eff7cf4 | Michael Niedermayer | */
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| 19 | #include "avcodec.h" |
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| 20 | |||
| 21 | /* TODO:
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| 22 | * - add 2, 4 and 16 bit depth support
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| 23 | * - use filters when generating a png (better compression)
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| 24 | */
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| 25 | |||
| 26 | #ifdef CONFIG_ZLIB
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| 27 | #include <zlib.h> |
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| 28 | |||
| 29 | //#define DEBUG
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| 30 | |||
| 31 | #define PNG_COLOR_MASK_PALETTE 1 |
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| 32 | #define PNG_COLOR_MASK_COLOR 2 |
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| 33 | #define PNG_COLOR_MASK_ALPHA 4 |
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| 34 | |||
| 35 | #define PNG_COLOR_TYPE_GRAY 0 |
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| 36 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
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| 37 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
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| 38 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
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| 39 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
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| 40 | |||
| 41 | #define PNG_FILTER_VALUE_NONE 0 |
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| 42 | #define PNG_FILTER_VALUE_SUB 1 |
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| 43 | #define PNG_FILTER_VALUE_UP 2 |
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| 44 | #define PNG_FILTER_VALUE_AVG 3 |
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| 45 | #define PNG_FILTER_VALUE_PAETH 4 |
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| 46 | |||
| 47 | #define PNG_IHDR 0x0001 |
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| 48 | #define PNG_IDAT 0x0002 |
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| 49 | #define PNG_ALLIMAGE 0x0004 |
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| 50 | #define PNG_PLTE 0x0008 |
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| 51 | |||
| 52 | #define NB_PASSES 7 |
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| 53 | |||
| 54 | #define IOBUF_SIZE 4096 |
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| 55 | |||
| 56 | typedef struct PNGContext { |
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| 57 | uint8_t *bytestream; |
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| 58 | uint8_t *bytestream_start; |
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| 59 | uint8_t *bytestream_end; |
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| 60 | AVFrame picture; |
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| 61 | |||
| 62 | int state;
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| 63 | int width, height;
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| 64 | int bit_depth;
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| 65 | int color_type;
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| 66 | int compression_type;
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| 67 | int interlace_type;
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| 68 | int filter_type;
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| 69 | int channels;
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| 70 | int bits_per_pixel;
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| 71 | int bpp;
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| 72 | 115329f1 | Diego Biurrun | |
| 73 | 4eff7cf4 | Michael Niedermayer | uint8_t *image_buf; |
| 74 | int image_linesize;
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| 75 | uint32_t palette[256];
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| 76 | uint8_t *crow_buf; |
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| 77 | uint8_t *last_row; |
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| 78 | uint8_t *tmp_row; |
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| 79 | int pass;
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| 80 | int crow_size; /* compressed row size (include filter type) */ |
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| 81 | int row_size; /* decompressed row size */ |
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| 82 | int pass_row_size; /* decompress row size of the current pass */ |
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| 83 | int y;
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| 84 | z_stream zstream; |
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| 85 | uint8_t buf[IOBUF_SIZE]; |
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| 86 | } PNGContext; |
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| 87 | |||
| 88 | static unsigned int get32(uint8_t **b){ |
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| 89 | (*b) += 4;
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| 90 | return ((*b)[-4]<<24) + ((*b)[-3]<<16) + ((*b)[-2]<<8) + (*b)[-1]; |
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| 91 | } |
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| 92 | |||
| 93 | static void put32(uint8_t **b, unsigned int v){ |
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| 94 | *(*b)++= v>>24;
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| 95 | *(*b)++= v>>16;
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| 96 | *(*b)++= v>>8;
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| 97 | *(*b)++= v; |
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| 98 | } |
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| 99 | |||
| 100 | static const uint8_t pngsig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
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| 101 | |||
| 102 | /* Mask to determine which y pixels are valid in a pass */
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| 103 | static const uint8_t png_pass_ymask[NB_PASSES] = { |
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| 104 | 0x80, 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, |
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| 105 | }; |
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| 106 | |||
| 107 | /* Mask to determine which y pixels can be written in a pass */
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| 108 | static const uint8_t png_pass_dsp_ymask[NB_PASSES] = { |
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| 109 | 0xff, 0xff, 0x0f, 0xcc, 0x33, 0xff, 0x55, |
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| 110 | }; |
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| 111 | |||
| 112 | /* minimum x value */
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| 113 | static const uint8_t png_pass_xmin[NB_PASSES] = { |
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| 114 | 0, 4, 0, 2, 0, 1, 0 |
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| 115 | }; |
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| 116 | |||
| 117 | /* x shift to get row width */
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| 118 | static const uint8_t png_pass_xshift[NB_PASSES] = { |
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| 119 | 3, 3, 2, 2, 1, 1, 0 |
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| 120 | }; |
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| 121 | |||
| 122 | /* Mask to determine which pixels are valid in a pass */
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| 123 | static const uint8_t png_pass_mask[NB_PASSES] = { |
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| 124 | 0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff |
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| 125 | }; |
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| 126 | |||
| 127 | /* Mask to determine which pixels to overwrite while displaying */
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| 128 | 115329f1 | Diego Biurrun | static const uint8_t png_pass_dsp_mask[NB_PASSES] = { |
| 129 | 4eff7cf4 | Michael Niedermayer | 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff |
| 130 | }; |
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| 131 | #if 0
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| 132 | static int png_probe(AVProbeData *pd)
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| 133 | {
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| 134 | if (pd->buf_size >= 8 &&
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| 135 | memcmp(pd->buf, pngsig, 8) == 0)
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| 136 | return AVPROBE_SCORE_MAX;
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| 137 | else
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| 138 | return 0;
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| 139 | }
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| 140 | #endif
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| 141 | static void *png_zalloc(void *opaque, unsigned int items, unsigned int size) |
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| 142 | {
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| 143 | 0ecca7a4 | Michael Niedermayer | if(items >= UINT_MAX / size)
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| 144 | return NULL; |
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| 145 | 4eff7cf4 | Michael Niedermayer | return av_malloc(items * size);
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| 146 | } |
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| 147 | |||
| 148 | static void png_zfree(void *opaque, void *ptr) |
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| 149 | {
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| 150 | av_free(ptr); |
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| 151 | } |
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| 152 | |||
| 153 | static int png_get_nb_channels(int color_type) |
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| 154 | {
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| 155 | int channels;
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| 156 | channels = 1;
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| 157 | if ((color_type & (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)) ==
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| 158 | PNG_COLOR_MASK_COLOR) |
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| 159 | channels = 3;
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| 160 | if (color_type & PNG_COLOR_MASK_ALPHA)
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| 161 | channels++; |
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| 162 | return channels;
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| 163 | } |
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| 164 | |||
| 165 | /* compute the row size of an interleaved pass */
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| 166 | static int png_pass_row_size(int pass, int bits_per_pixel, int width) |
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| 167 | {
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| 168 | int shift, xmin, pass_width;
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| 169 | |||
| 170 | xmin = png_pass_xmin[pass]; |
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| 171 | if (width <= xmin)
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| 172 | return 0; |
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| 173 | shift = png_pass_xshift[pass]; |
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| 174 | pass_width = (width - xmin + (1 << shift) - 1) >> shift; |
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| 175 | return (pass_width * bits_per_pixel + 7) >> 3; |
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| 176 | } |
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| 177 | |||
| 178 | /* NOTE: we try to construct a good looking image at each pass. width
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| 179 | is the original image width. We also do pixel format convertion at
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| 180 | this stage */
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| 181 | 115329f1 | Diego Biurrun | static void png_put_interlaced_row(uint8_t *dst, int width, |
| 182 | int bits_per_pixel, int pass, |
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| 183 | 4eff7cf4 | Michael Niedermayer | int color_type, const uint8_t *src) |
| 184 | {
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| 185 | int x, mask, dsp_mask, j, src_x, b, bpp;
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| 186 | uint8_t *d; |
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| 187 | const uint8_t *s;
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| 188 | 115329f1 | Diego Biurrun | |
| 189 | 4eff7cf4 | Michael Niedermayer | mask = png_pass_mask[pass]; |
| 190 | dsp_mask = png_pass_dsp_mask[pass]; |
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| 191 | switch(bits_per_pixel) {
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| 192 | case 1: |
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| 193 | /* we must intialize the line to zero before writing to it */
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| 194 | if (pass == 0) |
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| 195 | memset(dst, 0, (width + 7) >> 3); |
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| 196 | src_x = 0;
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| 197 | for(x = 0; x < width; x++) { |
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| 198 | j = (x & 7);
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| 199 | if ((dsp_mask << j) & 0x80) { |
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| 200 | b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1; |
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| 201 | dst[x >> 3] |= b << (7 - j); |
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| 202 | } |
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| 203 | if ((mask << j) & 0x80) |
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| 204 | src_x++; |
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| 205 | } |
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| 206 | break;
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| 207 | default:
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| 208 | bpp = bits_per_pixel >> 3;
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| 209 | d = dst; |
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| 210 | s = src; |
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| 211 | if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
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| 212 | for(x = 0; x < width; x++) { |
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| 213 | j = x & 7;
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| 214 | if ((dsp_mask << j) & 0x80) { |
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| 215 | *(uint32_t *)d = (s[3] << 24) | (s[0] << 16) | (s[1] << 8) | s[2]; |
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| 216 | } |
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| 217 | d += bpp; |
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| 218 | if ((mask << j) & 0x80) |
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| 219 | s += bpp; |
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| 220 | } |
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| 221 | } else {
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| 222 | for(x = 0; x < width; x++) { |
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| 223 | j = x & 7;
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| 224 | if ((dsp_mask << j) & 0x80) { |
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| 225 | memcpy(d, s, bpp); |
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| 226 | } |
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| 227 | d += bpp; |
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| 228 | if ((mask << j) & 0x80) |
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| 229 | s += bpp; |
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| 230 | } |
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| 231 | } |
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| 232 | break;
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| 233 | } |
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| 234 | } |
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| 235 | |||
| 236 | 115329f1 | Diego Biurrun | static void png_get_interlaced_row(uint8_t *dst, int row_size, |
| 237 | int bits_per_pixel, int pass, |
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| 238 | 4eff7cf4 | Michael Niedermayer | const uint8_t *src, int width) |
| 239 | {
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| 240 | int x, mask, dst_x, j, b, bpp;
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| 241 | uint8_t *d; |
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| 242 | const uint8_t *s;
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| 243 | |||
| 244 | mask = png_pass_mask[pass]; |
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| 245 | switch(bits_per_pixel) {
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| 246 | case 1: |
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| 247 | memset(dst, 0, row_size);
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| 248 | dst_x = 0;
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| 249 | for(x = 0; x < width; x++) { |
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| 250 | j = (x & 7);
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| 251 | if ((mask << j) & 0x80) { |
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| 252 | b = (src[x >> 3] >> (7 - j)) & 1; |
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| 253 | dst[dst_x >> 3] |= b << (7 - (dst_x & 7)); |
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| 254 | dst_x++; |
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| 255 | } |
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| 256 | } |
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| 257 | break;
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| 258 | default:
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| 259 | bpp = bits_per_pixel >> 3;
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| 260 | d = dst; |
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| 261 | s = src; |
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| 262 | for(x = 0; x < width; x++) { |
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| 263 | j = x & 7;
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| 264 | if ((mask << j) & 0x80) { |
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| 265 | memcpy(d, s, bpp); |
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| 266 | d += bpp; |
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| 267 | } |
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| 268 | s += bpp; |
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| 269 | } |
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| 270 | break;
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| 271 | } |
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| 272 | } |
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| 273 | |||
| 274 | /* XXX: optimize */
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| 275 | /* NOTE: 'dst' can be equal to 'last' */
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| 276 | 115329f1 | Diego Biurrun | static void png_filter_row(uint8_t *dst, int filter_type, |
| 277 | 4eff7cf4 | Michael Niedermayer | uint8_t *src, uint8_t *last, int size, int bpp) |
| 278 | {
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| 279 | int i, p;
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| 280 | |||
| 281 | switch(filter_type) {
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| 282 | case PNG_FILTER_VALUE_NONE:
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| 283 | memcpy(dst, src, size); |
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| 284 | break;
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| 285 | case PNG_FILTER_VALUE_SUB:
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| 286 | for(i = 0; i < bpp; i++) { |
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| 287 | dst[i] = src[i]; |
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| 288 | } |
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| 289 | for(i = bpp; i < size; i++) {
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| 290 | p = dst[i - bpp]; |
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| 291 | dst[i] = p + src[i]; |
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| 292 | } |
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| 293 | break;
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| 294 | case PNG_FILTER_VALUE_UP:
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| 295 | for(i = 0; i < size; i++) { |
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| 296 | p = last[i]; |
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| 297 | dst[i] = p + src[i]; |
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| 298 | } |
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| 299 | break;
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| 300 | case PNG_FILTER_VALUE_AVG:
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| 301 | for(i = 0; i < bpp; i++) { |
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| 302 | p = (last[i] >> 1);
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| 303 | dst[i] = p + src[i]; |
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| 304 | } |
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| 305 | for(i = bpp; i < size; i++) {
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| 306 | p = ((dst[i - bpp] + last[i]) >> 1);
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| 307 | dst[i] = p + src[i]; |
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| 308 | } |
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| 309 | break;
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| 310 | case PNG_FILTER_VALUE_PAETH:
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| 311 | for(i = 0; i < bpp; i++) { |
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| 312 | p = last[i]; |
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| 313 | dst[i] = p + src[i]; |
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| 314 | } |
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| 315 | for(i = bpp; i < size; i++) {
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| 316 | int a, b, c, pa, pb, pc;
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| 317 | |||
| 318 | a = dst[i - bpp]; |
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| 319 | b = last[i]; |
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| 320 | c = last[i - bpp]; |
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| 321 | |||
| 322 | p = b - c; |
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| 323 | pc = a - c; |
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| 324 | |||
| 325 | pa = abs(p); |
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| 326 | pb = abs(pc); |
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| 327 | pc = abs(p + pc); |
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| 328 | |||
| 329 | if (pa <= pb && pa <= pc)
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| 330 | p = a; |
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| 331 | else if (pb <= pc) |
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| 332 | p = b; |
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| 333 | else
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| 334 | p = c; |
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| 335 | dst[i] = p + src[i]; |
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| 336 | } |
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| 337 | break;
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| 338 | } |
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| 339 | } |
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| 340 | |||
| 341 | static void convert_from_rgba32(uint8_t *dst, const uint8_t *src, int width) |
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| 342 | {
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| 343 | uint8_t *d; |
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| 344 | int j;
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| 345 | unsigned int v; |
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| 346 | 115329f1 | Diego Biurrun | |
| 347 | 4eff7cf4 | Michael Niedermayer | d = dst; |
| 348 | for(j = 0; j < width; j++) { |
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| 349 | v = ((uint32_t *)src)[j]; |
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| 350 | d[0] = v >> 16; |
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| 351 | d[1] = v >> 8; |
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| 352 | d[2] = v;
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| 353 | d[3] = v >> 24; |
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| 354 | d += 4;
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| 355 | } |
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| 356 | } |
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| 357 | |||
| 358 | static void convert_to_rgba32(uint8_t *dst, const uint8_t *src, int width) |
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| 359 | {
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| 360 | int j;
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| 361 | unsigned int r, g, b, a; |
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| 362 | |||
| 363 | for(j = 0;j < width; j++) { |
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| 364 | r = src[0];
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| 365 | g = src[1];
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| 366 | b = src[2];
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| 367 | a = src[3];
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| 368 | *(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b; |
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| 369 | dst += 4;
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| 370 | src += 4;
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| 371 | } |
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| 372 | } |
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| 373 | |||
| 374 | /* process exactly one decompressed row */
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| 375 | static void png_handle_row(PNGContext *s) |
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| 376 | {
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| 377 | uint8_t *ptr, *last_row; |
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| 378 | int got_line;
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| 379 | 115329f1 | Diego Biurrun | |
| 380 | 4eff7cf4 | Michael Niedermayer | if (!s->interlace_type) {
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| 381 | ptr = s->image_buf + s->image_linesize * s->y; |
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| 382 | /* need to swap bytes correctly for RGB_ALPHA */
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| 383 | if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
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| 384 | 115329f1 | Diego Biurrun | png_filter_row(s->tmp_row, s->crow_buf[0], s->crow_buf + 1, |
| 385 | 4eff7cf4 | Michael Niedermayer | s->last_row, s->row_size, s->bpp); |
| 386 | memcpy(s->last_row, s->tmp_row, s->row_size); |
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| 387 | convert_to_rgba32(ptr, s->tmp_row, s->width); |
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| 388 | } else {
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| 389 | /* in normal case, we avoid one copy */
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| 390 | if (s->y == 0) |
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| 391 | last_row = s->last_row; |
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| 392 | else
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| 393 | last_row = ptr - s->image_linesize; |
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| 394 | 115329f1 | Diego Biurrun | |
| 395 | png_filter_row(ptr, s->crow_buf[0], s->crow_buf + 1, |
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| 396 | 4eff7cf4 | Michael Niedermayer | last_row, s->row_size, s->bpp); |
| 397 | } |
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| 398 | s->y++; |
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| 399 | if (s->y == s->height) {
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| 400 | s->state |= PNG_ALLIMAGE; |
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| 401 | } |
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| 402 | } else {
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| 403 | got_line = 0;
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| 404 | for(;;) {
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| 405 | ptr = s->image_buf + s->image_linesize * s->y; |
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| 406 | if ((png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) { |
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| 407 | /* if we already read one row, it is time to stop to
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| 408 | wait for the next one */
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| 409 | if (got_line)
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| 410 | break;
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| 411 | 115329f1 | Diego Biurrun | png_filter_row(s->tmp_row, s->crow_buf[0], s->crow_buf + 1, |
| 412 | 4eff7cf4 | Michael Niedermayer | s->last_row, s->pass_row_size, s->bpp); |
| 413 | memcpy(s->last_row, s->tmp_row, s->pass_row_size); |
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| 414 | got_line = 1;
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| 415 | } |
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| 416 | if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) { |
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| 417 | /* NOTE: rgba32 is handled directly in png_put_interlaced_row */
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| 418 | 115329f1 | Diego Biurrun | png_put_interlaced_row(ptr, s->width, s->bits_per_pixel, s->pass, |
| 419 | 4eff7cf4 | Michael Niedermayer | s->color_type, s->last_row); |
| 420 | } |
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| 421 | s->y++; |
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| 422 | if (s->y == s->height) {
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| 423 | for(;;) {
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| 424 | if (s->pass == NB_PASSES - 1) { |
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| 425 | s->state |= PNG_ALLIMAGE; |
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| 426 | goto the_end;
|
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| 427 | } else {
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| 428 | s->pass++; |
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| 429 | s->y = 0;
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| 430 | 115329f1 | Diego Biurrun | s->pass_row_size = png_pass_row_size(s->pass, |
| 431 | s->bits_per_pixel, |
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| 432 | 4eff7cf4 | Michael Niedermayer | s->width); |
| 433 | s->crow_size = s->pass_row_size + 1;
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| 434 | if (s->pass_row_size != 0) |
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| 435 | break;
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| 436 | /* skip pass if empty row */
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| 437 | } |
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| 438 | } |
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| 439 | } |
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| 440 | } |
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| 441 | the_end: ;
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| 442 | } |
||
| 443 | } |
||
| 444 | |||
| 445 | static int png_decode_idat(PNGContext *s, int length) |
||
| 446 | {
|
||
| 447 | int ret;
|
||
| 448 | s->zstream.avail_in = length; |
||
| 449 | s->zstream.next_in = s->bytestream; |
||
| 450 | s->bytestream += length; |
||
| 451 | 115329f1 | Diego Biurrun | |
| 452 | 4eff7cf4 | Michael Niedermayer | if(s->bytestream > s->bytestream_end)
|
| 453 | return -1; |
||
| 454 | |||
| 455 | /* decode one line if possible */
|
||
| 456 | while (s->zstream.avail_in > 0) { |
||
| 457 | ret = inflate(&s->zstream, Z_PARTIAL_FLUSH); |
||
| 458 | if (ret != Z_OK && ret != Z_STREAM_END) {
|
||
| 459 | return -1; |
||
| 460 | } |
||
| 461 | if (s->zstream.avail_out == 0) { |
||
| 462 | if (!(s->state & PNG_ALLIMAGE)) {
|
||
| 463 | png_handle_row(s); |
||
| 464 | } |
||
| 465 | s->zstream.avail_out = s->crow_size; |
||
| 466 | s->zstream.next_out = s->crow_buf; |
||
| 467 | } |
||
| 468 | } |
||
| 469 | return 0; |
||
| 470 | } |
||
| 471 | |||
| 472 | 115329f1 | Diego Biurrun | static int decode_frame(AVCodecContext *avctx, |
| 473 | 4eff7cf4 | Michael Niedermayer | void *data, int *data_size, |
| 474 | uint8_t *buf, int buf_size)
|
||
| 475 | {
|
||
| 476 | PNGContext * const s = avctx->priv_data;
|
||
| 477 | AVFrame *picture = data; |
||
| 478 | AVFrame * const p= (AVFrame*)&s->picture;
|
||
| 479 | uint32_t tag, length; |
||
| 480 | int ret, crc;
|
||
| 481 | |||
| 482 | s->bytestream_start= |
||
| 483 | s->bytestream= buf; |
||
| 484 | s->bytestream_end= buf + buf_size; |
||
| 485 | |||
| 486 | /* check signature */
|
||
| 487 | if (memcmp(s->bytestream, pngsig, 8) != 0) |
||
| 488 | return -1; |
||
| 489 | s->bytestream+= 8;
|
||
| 490 | s->y= |
||
| 491 | s->state=0;
|
||
| 492 | // memset(s, 0, sizeof(PNGContext));
|
||
| 493 | /* init the zlib */
|
||
| 494 | s->zstream.zalloc = png_zalloc; |
||
| 495 | s->zstream.zfree = png_zfree; |
||
| 496 | s->zstream.opaque = NULL;
|
||
| 497 | ret = inflateInit(&s->zstream); |
||
| 498 | if (ret != Z_OK)
|
||
| 499 | return -1; |
||
| 500 | for(;;) {
|
||
| 501 | e20815b3 | Milan Cutka | int tag32;
|
| 502 | 4eff7cf4 | Michael Niedermayer | if (s->bytestream >= s->bytestream_end)
|
| 503 | goto fail;
|
||
| 504 | length = get32(&s->bytestream); |
||
| 505 | if (length > 0x7fffffff) |
||
| 506 | goto fail;
|
||
| 507 | e20815b3 | Milan Cutka | tag32 = get32(&s->bytestream); |
| 508 | tag = bswap_32(tag32); |
||
| 509 | 4eff7cf4 | Michael Niedermayer | #ifdef DEBUG
|
| 510 | 115329f1 | Diego Biurrun | printf("png: tag=%c%c%c%c length=%u\n",
|
| 511 | 4eff7cf4 | Michael Niedermayer | (tag & 0xff),
|
| 512 | ((tag >> 8) & 0xff), |
||
| 513 | ((tag >> 16) & 0xff), |
||
| 514 | ((tag >> 24) & 0xff), length); |
||
| 515 | #endif
|
||
| 516 | switch(tag) {
|
||
| 517 | case MKTAG('I', 'H', 'D', 'R'): |
||
| 518 | if (length != 13) |
||
| 519 | goto fail;
|
||
| 520 | s->width = get32(&s->bytestream); |
||
| 521 | s->height = get32(&s->bytestream); |
||
| 522 | 0ecca7a4 | Michael Niedermayer | if(avcodec_check_dimensions(avctx, s->width, s->height)){
|
| 523 | s->width= s->height= 0;
|
||
| 524 | goto fail;
|
||
| 525 | } |
||
| 526 | 4eff7cf4 | Michael Niedermayer | s->bit_depth = *s->bytestream++; |
| 527 | s->color_type = *s->bytestream++; |
||
| 528 | s->compression_type = *s->bytestream++; |
||
| 529 | s->filter_type = *s->bytestream++; |
||
| 530 | s->interlace_type = *s->bytestream++; |
||
| 531 | crc = get32(&s->bytestream); |
||
| 532 | s->state |= PNG_IHDR; |
||
| 533 | #ifdef DEBUG
|
||
| 534 | 115329f1 | Diego Biurrun | printf("width=%d height=%d depth=%d color_type=%d compression_type=%d filter_type=%d interlace_type=%d\n",
|
| 535 | s->width, s->height, s->bit_depth, s->color_type, |
||
| 536 | 4eff7cf4 | Michael Niedermayer | s->compression_type, s->filter_type, s->interlace_type); |
| 537 | #endif
|
||
| 538 | break;
|
||
| 539 | case MKTAG('I', 'D', 'A', 'T'): |
||
| 540 | if (!(s->state & PNG_IHDR))
|
||
| 541 | goto fail;
|
||
| 542 | if (!(s->state & PNG_IDAT)) {
|
||
| 543 | /* init image info */
|
||
| 544 | avctx->width = s->width; |
||
| 545 | avctx->height = s->height; |
||
| 546 | |||
| 547 | s->channels = png_get_nb_channels(s->color_type); |
||
| 548 | s->bits_per_pixel = s->bit_depth * s->channels; |
||
| 549 | s->bpp = (s->bits_per_pixel + 7) >> 3; |
||
| 550 | s->row_size = (avctx->width * s->bits_per_pixel + 7) >> 3; |
||
| 551 | |||
| 552 | 115329f1 | Diego Biurrun | if (s->bit_depth == 8 && |
| 553 | 4eff7cf4 | Michael Niedermayer | s->color_type == PNG_COLOR_TYPE_RGB) {
|
| 554 | avctx->pix_fmt = PIX_FMT_RGB24; |
||
| 555 | 115329f1 | Diego Biurrun | } else if (s->bit_depth == 8 && |
| 556 | 4eff7cf4 | Michael Niedermayer | s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
|
| 557 | avctx->pix_fmt = PIX_FMT_RGBA32; |
||
| 558 | 115329f1 | Diego Biurrun | } else if (s->bit_depth == 8 && |
| 559 | 4eff7cf4 | Michael Niedermayer | s->color_type == PNG_COLOR_TYPE_GRAY) {
|
| 560 | avctx->pix_fmt = PIX_FMT_GRAY8; |
||
| 561 | 115329f1 | Diego Biurrun | } else if (s->bit_depth == 1 && |
| 562 | 4eff7cf4 | Michael Niedermayer | s->color_type == PNG_COLOR_TYPE_GRAY) {
|
| 563 | avctx->pix_fmt = PIX_FMT_MONOBLACK; |
||
| 564 | } else if (s->color_type == PNG_COLOR_TYPE_PALETTE) { |
||
| 565 | avctx->pix_fmt = PIX_FMT_PAL8; |
||
| 566 | } else {
|
||
| 567 | goto fail;
|
||
| 568 | } |
||
| 569 | if(p->data[0]) |
||
| 570 | avctx->release_buffer(avctx, p); |
||
| 571 | 115329f1 | Diego Biurrun | |
| 572 | 4eff7cf4 | Michael Niedermayer | p->reference= 0;
|
| 573 | if(avctx->get_buffer(avctx, p) < 0){ |
||
| 574 | av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
||
| 575 | goto fail;
|
||
| 576 | } |
||
| 577 | p->pict_type= FF_I_TYPE; |
||
| 578 | p->key_frame= 1;
|
||
| 579 | p->interlaced_frame = !!s->interlace_type; |
||
| 580 | |||
| 581 | /* compute the compressed row size */
|
||
| 582 | if (!s->interlace_type) {
|
||
| 583 | s->crow_size = s->row_size + 1;
|
||
| 584 | } else {
|
||
| 585 | s->pass = 0;
|
||
| 586 | 115329f1 | Diego Biurrun | s->pass_row_size = png_pass_row_size(s->pass, |
| 587 | s->bits_per_pixel, |
||
| 588 | 4eff7cf4 | Michael Niedermayer | s->width); |
| 589 | s->crow_size = s->pass_row_size + 1;
|
||
| 590 | } |
||
| 591 | #ifdef DEBUG
|
||
| 592 | 115329f1 | Diego Biurrun | printf("row_size=%d crow_size =%d\n",
|
| 593 | 4eff7cf4 | Michael Niedermayer | s->row_size, s->crow_size); |
| 594 | #endif
|
||
| 595 | s->image_buf = p->data[0];
|
||
| 596 | s->image_linesize = p->linesize[0];
|
||
| 597 | /* copy the palette if needed */
|
||
| 598 | if (s->color_type == PNG_COLOR_TYPE_PALETTE)
|
||
| 599 | memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t)); |
||
| 600 | /* empty row is used if differencing to the first row */
|
||
| 601 | s->last_row = av_mallocz(s->row_size); |
||
| 602 | if (!s->last_row)
|
||
| 603 | goto fail;
|
||
| 604 | if (s->interlace_type ||
|
||
| 605 | s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
|
||
| 606 | s->tmp_row = av_malloc(s->row_size); |
||
| 607 | if (!s->tmp_row)
|
||
| 608 | goto fail;
|
||
| 609 | } |
||
| 610 | /* compressed row */
|
||
| 611 | s->crow_buf = av_malloc(s->row_size + 1);
|
||
| 612 | if (!s->crow_buf)
|
||
| 613 | goto fail;
|
||
| 614 | s->zstream.avail_out = s->crow_size; |
||
| 615 | s->zstream.next_out = s->crow_buf; |
||
| 616 | } |
||
| 617 | s->state |= PNG_IDAT; |
||
| 618 | if (png_decode_idat(s, length) < 0) |
||
| 619 | goto fail;
|
||
| 620 | /* skip crc */
|
||
| 621 | crc = get32(&s->bytestream); |
||
| 622 | break;
|
||
| 623 | case MKTAG('P', 'L', 'T', 'E'): |
||
| 624 | {
|
||
| 625 | int n, i, r, g, b;
|
||
| 626 | 115329f1 | Diego Biurrun | |
| 627 | 4eff7cf4 | Michael Niedermayer | if ((length % 3) != 0 || length > 256 * 3) |
| 628 | goto skip_tag;
|
||
| 629 | /* read the palette */
|
||
| 630 | n = length / 3;
|
||
| 631 | for(i=0;i<n;i++) { |
||
| 632 | r = *s->bytestream++; |
||
| 633 | g = *s->bytestream++; |
||
| 634 | b = *s->bytestream++; |
||
| 635 | s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b; |
||
| 636 | } |
||
| 637 | for(;i<256;i++) { |
||
| 638 | s->palette[i] = (0xff << 24); |
||
| 639 | } |
||
| 640 | s->state |= PNG_PLTE; |
||
| 641 | crc = get32(&s->bytestream); |
||
| 642 | } |
||
| 643 | break;
|
||
| 644 | case MKTAG('t', 'R', 'N', 'S'): |
||
| 645 | {
|
||
| 646 | int v, i;
|
||
| 647 | |||
| 648 | /* read the transparency. XXX: Only palette mode supported */
|
||
| 649 | if (s->color_type != PNG_COLOR_TYPE_PALETTE ||
|
||
| 650 | length > 256 ||
|
||
| 651 | !(s->state & PNG_PLTE)) |
||
| 652 | goto skip_tag;
|
||
| 653 | for(i=0;i<length;i++) { |
||
| 654 | v = *s->bytestream++; |
||
| 655 | s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24); |
||
| 656 | } |
||
| 657 | crc = get32(&s->bytestream); |
||
| 658 | } |
||
| 659 | break;
|
||
| 660 | case MKTAG('I', 'E', 'N', 'D'): |
||
| 661 | if (!(s->state & PNG_ALLIMAGE))
|
||
| 662 | goto fail;
|
||
| 663 | crc = get32(&s->bytestream); |
||
| 664 | goto exit_loop;
|
||
| 665 | default:
|
||
| 666 | /* skip tag */
|
||
| 667 | skip_tag:
|
||
| 668 | s->bytestream += length + 4;
|
||
| 669 | break;
|
||
| 670 | } |
||
| 671 | } |
||
| 672 | exit_loop:
|
||
| 673 | *picture= *(AVFrame*)&s->picture; |
||
| 674 | *data_size = sizeof(AVPicture);
|
||
| 675 | |||
| 676 | ret = s->bytestream - s->bytestream_start; |
||
| 677 | the_end:
|
||
| 678 | inflateEnd(&s->zstream); |
||
| 679 | av_freep(&s->crow_buf); |
||
| 680 | av_freep(&s->last_row); |
||
| 681 | av_freep(&s->tmp_row); |
||
| 682 | return ret;
|
||
| 683 | fail:
|
||
| 684 | ret = -1;
|
||
| 685 | goto the_end;
|
||
| 686 | } |
||
| 687 | |||
| 688 | static void png_write_chunk(uint8_t **f, uint32_t tag, |
||
| 689 | const uint8_t *buf, int length) |
||
| 690 | {
|
||
| 691 | uint32_t crc; |
||
| 692 | uint8_t tagbuf[4];
|
||
| 693 | |||
| 694 | put32(f, length); |
||
| 695 | crc = crc32(0, Z_NULL, 0); |
||
| 696 | tagbuf[0] = tag;
|
||
| 697 | tagbuf[1] = tag >> 8; |
||
| 698 | tagbuf[2] = tag >> 16; |
||
| 699 | tagbuf[3] = tag >> 24; |
||
| 700 | crc = crc32(crc, tagbuf, 4);
|
||
| 701 | put32(f, bswap_32(tag)); |
||
| 702 | if (length > 0) { |
||
| 703 | crc = crc32(crc, buf, length); |
||
| 704 | memcpy(*f, buf, length); |
||
| 705 | *f += length; |
||
| 706 | } |
||
| 707 | put32(f, crc); |
||
| 708 | } |
||
| 709 | |||
| 710 | /* XXX: use avcodec generic function ? */
|
||
| 711 | static void to_be32(uint8_t *p, uint32_t v) |
||
| 712 | {
|
||
| 713 | p[0] = v >> 24; |
||
| 714 | p[1] = v >> 16; |
||
| 715 | p[2] = v >> 8; |
||
| 716 | p[3] = v;
|
||
| 717 | } |
||
| 718 | |||
| 719 | /* XXX: do filtering */
|
||
| 720 | static int png_write_row(PNGContext *s, const uint8_t *data, int size) |
||
| 721 | {
|
||
| 722 | int ret;
|
||
| 723 | |||
| 724 | s->zstream.avail_in = size; |
||
| 725 | s->zstream.next_in = (uint8_t *)data; |
||
| 726 | while (s->zstream.avail_in > 0) { |
||
| 727 | ret = deflate(&s->zstream, Z_NO_FLUSH); |
||
| 728 | if (ret != Z_OK)
|
||
| 729 | return -1; |
||
| 730 | if (s->zstream.avail_out == 0) { |
||
| 731 | 0ecca7a4 | Michael Niedermayer | if(s->bytestream_end - s->bytestream > IOBUF_SIZE + 100) |
| 732 | png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE); |
||
| 733 | 4eff7cf4 | Michael Niedermayer | s->zstream.avail_out = IOBUF_SIZE; |
| 734 | s->zstream.next_out = s->buf; |
||
| 735 | } |
||
| 736 | } |
||
| 737 | return 0; |
||
| 738 | } |
||
| 739 | |||
| 740 | static int common_init(AVCodecContext *avctx){ |
||
| 741 | PNGContext *s = avctx->priv_data; |
||
| 742 | |||
| 743 | avcodec_get_frame_defaults((AVFrame*)&s->picture); |
||
| 744 | avctx->coded_frame= (AVFrame*)&s->picture; |
||
| 745 | // s->avctx= avctx;
|
||
| 746 | |||
| 747 | return 0; |
||
| 748 | } |
||
| 749 | |||
| 750 | static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ |
||
| 751 | PNGContext *s = avctx->priv_data; |
||
| 752 | AVFrame *pict = data; |
||
| 753 | AVFrame * const p= (AVFrame*)&s->picture;
|
||
| 754 | int bit_depth, color_type, y, len, row_size, ret, is_progressive;
|
||
| 755 | int bits_per_pixel, pass_row_size;
|
||
| 756 | uint8_t *ptr; |
||
| 757 | uint8_t *crow_buf = NULL;
|
||
| 758 | uint8_t *tmp_buf = NULL;
|
||
| 759 | |||
| 760 | *p = *pict; |
||
| 761 | p->pict_type= FF_I_TYPE; |
||
| 762 | p->key_frame= 1;
|
||
| 763 | 115329f1 | Diego Biurrun | |
| 764 | 4eff7cf4 | Michael Niedermayer | s->bytestream_start= |
| 765 | s->bytestream= buf; |
||
| 766 | s->bytestream_end= buf+buf_size; |
||
| 767 | |||
| 768 | is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT); |
||
| 769 | switch(avctx->pix_fmt) {
|
||
| 770 | case PIX_FMT_RGBA32:
|
||
| 771 | bit_depth = 8;
|
||
| 772 | color_type = PNG_COLOR_TYPE_RGB_ALPHA; |
||
| 773 | break;
|
||
| 774 | case PIX_FMT_RGB24:
|
||
| 775 | bit_depth = 8;
|
||
| 776 | color_type = PNG_COLOR_TYPE_RGB; |
||
| 777 | break;
|
||
| 778 | case PIX_FMT_GRAY8:
|
||
| 779 | bit_depth = 8;
|
||
| 780 | color_type = PNG_COLOR_TYPE_GRAY; |
||
| 781 | break;
|
||
| 782 | case PIX_FMT_MONOBLACK:
|
||
| 783 | bit_depth = 1;
|
||
| 784 | color_type = PNG_COLOR_TYPE_GRAY; |
||
| 785 | break;
|
||
| 786 | case PIX_FMT_PAL8:
|
||
| 787 | bit_depth = 8;
|
||
| 788 | color_type = PNG_COLOR_TYPE_PALETTE; |
||
| 789 | break;
|
||
| 790 | default:
|
||
| 791 | return -1; |
||
| 792 | } |
||
| 793 | bits_per_pixel = png_get_nb_channels(color_type) * bit_depth; |
||
| 794 | row_size = (avctx->width * bits_per_pixel + 7) >> 3; |
||
| 795 | |||
| 796 | s->zstream.zalloc = png_zalloc; |
||
| 797 | s->zstream.zfree = png_zfree; |
||
| 798 | s->zstream.opaque = NULL;
|
||
| 799 | ret = deflateInit2(&s->zstream, Z_DEFAULT_COMPRESSION, |
||
| 800 | Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY); |
||
| 801 | if (ret != Z_OK)
|
||
| 802 | return -1; |
||
| 803 | crow_buf = av_malloc(row_size + 1);
|
||
| 804 | if (!crow_buf)
|
||
| 805 | goto fail;
|
||
| 806 | if (is_progressive) {
|
||
| 807 | tmp_buf = av_malloc(row_size + 1);
|
||
| 808 | if (!tmp_buf)
|
||
| 809 | goto fail;
|
||
| 810 | } |
||
| 811 | |||
| 812 | /* write png header */
|
||
| 813 | memcpy(s->bytestream, pngsig, 8);
|
||
| 814 | s->bytestream += 8;
|
||
| 815 | 115329f1 | Diego Biurrun | |
| 816 | 4eff7cf4 | Michael Niedermayer | to_be32(s->buf, avctx->width); |
| 817 | to_be32(s->buf + 4, avctx->height);
|
||
| 818 | s->buf[8] = bit_depth;
|
||
| 819 | s->buf[9] = color_type;
|
||
| 820 | s->buf[10] = 0; /* compression type */ |
||
| 821 | s->buf[11] = 0; /* filter type */ |
||
| 822 | s->buf[12] = is_progressive; /* interlace type */ |
||
| 823 | 115329f1 | Diego Biurrun | |
| 824 | 4eff7cf4 | Michael Niedermayer | png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13); |
| 825 | |||
| 826 | /* put the palette if needed */
|
||
| 827 | if (color_type == PNG_COLOR_TYPE_PALETTE) {
|
||
| 828 | int has_alpha, alpha, i;
|
||
| 829 | unsigned int v; |
||
| 830 | uint32_t *palette; |
||
| 831 | uint8_t *alpha_ptr; |
||
| 832 | 115329f1 | Diego Biurrun | |
| 833 | 4eff7cf4 | Michael Niedermayer | palette = (uint32_t *)p->data[1];
|
| 834 | ptr = s->buf; |
||
| 835 | alpha_ptr = s->buf + 256 * 3; |
||
| 836 | has_alpha = 0;
|
||
| 837 | for(i = 0; i < 256; i++) { |
||
| 838 | v = palette[i]; |
||
| 839 | alpha = v >> 24;
|
||
| 840 | if (alpha != 0xff) |
||
| 841 | has_alpha = 1;
|
||
| 842 | *alpha_ptr++ = alpha; |
||
| 843 | ptr[0] = v >> 16; |
||
| 844 | ptr[1] = v >> 8; |
||
| 845 | ptr[2] = v;
|
||
| 846 | ptr += 3;
|
||
| 847 | } |
||
| 848 | png_write_chunk(&s->bytestream, MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3); |
||
| 849 | if (has_alpha) {
|
||
| 850 | png_write_chunk(&s->bytestream, MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256); |
||
| 851 | } |
||
| 852 | } |
||
| 853 | |||
| 854 | /* now put each row */
|
||
| 855 | s->zstream.avail_out = IOBUF_SIZE; |
||
| 856 | s->zstream.next_out = s->buf; |
||
| 857 | if (is_progressive) {
|
||
| 858 | uint8_t *ptr1; |
||
| 859 | int pass;
|
||
| 860 | |||
| 861 | for(pass = 0; pass < NB_PASSES; pass++) { |
||
| 862 | /* NOTE: a pass is completely omited if no pixels would be
|
||
| 863 | output */
|
||
| 864 | pass_row_size = png_pass_row_size(pass, bits_per_pixel, avctx->width); |
||
| 865 | if (pass_row_size > 0) { |
||
| 866 | for(y = 0; y < avctx->height; y++) { |
||
| 867 | if ((png_pass_ymask[pass] << (y & 7)) & 0x80) { |
||
| 868 | ptr = p->data[0] + y * p->linesize[0]; |
||
| 869 | if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
|
||
| 870 | convert_from_rgba32(tmp_buf, ptr, avctx->width); |
||
| 871 | ptr1 = tmp_buf; |
||
| 872 | } else {
|
||
| 873 | ptr1 = ptr; |
||
| 874 | } |
||
| 875 | 115329f1 | Diego Biurrun | png_get_interlaced_row(crow_buf + 1, pass_row_size,
|
| 876 | bits_per_pixel, pass, |
||
| 877 | 4eff7cf4 | Michael Niedermayer | ptr1, avctx->width); |
| 878 | crow_buf[0] = PNG_FILTER_VALUE_NONE;
|
||
| 879 | png_write_row(s, crow_buf, pass_row_size + 1);
|
||
| 880 | } |
||
| 881 | } |
||
| 882 | } |
||
| 883 | } |
||
| 884 | } else {
|
||
| 885 | for(y = 0; y < avctx->height; y++) { |
||
| 886 | ptr = p->data[0] + y * p->linesize[0]; |
||
| 887 | if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
||
| 888 | convert_from_rgba32(crow_buf + 1, ptr, avctx->width);
|
||
| 889 | else
|
||
| 890 | memcpy(crow_buf + 1, ptr, row_size);
|
||
| 891 | crow_buf[0] = PNG_FILTER_VALUE_NONE;
|
||
| 892 | png_write_row(s, crow_buf, row_size + 1);
|
||
| 893 | } |
||
| 894 | } |
||
| 895 | /* compress last bytes */
|
||
| 896 | for(;;) {
|
||
| 897 | ret = deflate(&s->zstream, Z_FINISH); |
||
| 898 | if (ret == Z_OK || ret == Z_STREAM_END) {
|
||
| 899 | len = IOBUF_SIZE - s->zstream.avail_out; |
||
| 900 | 0ecca7a4 | Michael Niedermayer | if (len > 0 && s->bytestream_end - s->bytestream > len + 100) { |
| 901 | 4eff7cf4 | Michael Niedermayer | png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len); |
| 902 | } |
||
| 903 | s->zstream.avail_out = IOBUF_SIZE; |
||
| 904 | s->zstream.next_out = s->buf; |
||
| 905 | if (ret == Z_STREAM_END)
|
||
| 906 | break;
|
||
| 907 | } else {
|
||
| 908 | goto fail;
|
||
| 909 | } |
||
| 910 | } |
||
| 911 | png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0); |
||
| 912 | |||
| 913 | ret = s->bytestream - s->bytestream_start; |
||
| 914 | the_end:
|
||
| 915 | av_free(crow_buf); |
||
| 916 | av_free(tmp_buf); |
||
| 917 | deflateEnd(&s->zstream); |
||
| 918 | return ret;
|
||
| 919 | fail:
|
||
| 920 | ret = -1;
|
||
| 921 | goto the_end;
|
||
| 922 | } |
||
| 923 | |||
| 924 | AVCodec png_decoder = {
|
||
| 925 | "png",
|
||
| 926 | CODEC_TYPE_VIDEO, |
||
| 927 | CODEC_ID_PNG, |
||
| 928 | sizeof(PNGContext),
|
||
| 929 | common_init, |
||
| 930 | NULL,
|
||
| 931 | NULL, //decode_end, |
||
| 932 | decode_frame, |
||
| 933 | 0 /*CODEC_CAP_DR1*/ /*| CODEC_CAP_DRAW_HORIZ_BAND*/, |
||
| 934 | NULL
|
||
| 935 | }; |
||
| 936 | |||
| 937 | 983ea0bc | Roine Gustafsson | #ifdef CONFIG_PNG_ENCODER
|
| 938 | 4eff7cf4 | Michael Niedermayer | AVCodec png_encoder = {
|
| 939 | "png",
|
||
| 940 | CODEC_TYPE_VIDEO, |
||
| 941 | CODEC_ID_PNG, |
||
| 942 | sizeof(PNGContext),
|
||
| 943 | common_init, |
||
| 944 | encode_frame, |
||
| 945 | NULL, //encode_end, |
||
| 946 | .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA32, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, -1}, |
||
| 947 | }; |
||
| 948 | 983ea0bc | Roine Gustafsson | #endif // CONFIG_PNG_ENCODER |
| 949 | 4eff7cf4 | Michael Niedermayer | #endif |