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 | } |
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443 | } |
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444 | |||
445 | static int png_decode_idat(PNGContext *s, int length) |
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446 | { |
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447 | int ret;
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448 | s->zstream.avail_in = length; |
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449 | s->zstream.next_in = s->bytestream; |
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450 | s->bytestream += length; |
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451 | 115329f1 | Diego Biurrun | |
452 | 4eff7cf4 | Michael Niedermayer | if(s->bytestream > s->bytestream_end)
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453 | return -1; |
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454 | |||
455 | /* decode one line if possible */
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456 | while (s->zstream.avail_in > 0) { |
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457 | ret = inflate(&s->zstream, Z_PARTIAL_FLUSH); |
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458 | if (ret != Z_OK && ret != Z_STREAM_END) {
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459 | return -1; |
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460 | } |
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461 | if (s->zstream.avail_out == 0) { |
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462 | if (!(s->state & PNG_ALLIMAGE)) {
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463 | png_handle_row(s); |
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464 | } |
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465 | s->zstream.avail_out = s->crow_size; |
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466 | s->zstream.next_out = s->crow_buf; |
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467 | } |
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468 | } |
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469 | return 0; |
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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 |