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4349 | Serge | 1 | /* |
2 | * PNM image format |
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3 | * Copyright (c) 2002, 2003 Fabrice Bellard |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include |
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23 | #include |
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24 | |||
25 | #include "libavutil/imgutils.h" |
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26 | #include "avcodec.h" |
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27 | #include "pnm.h" |
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28 | |||
29 | static inline int pnm_space(int c) |
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30 | { |
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31 | return c == ' ' || c == '\n' || c == '\r' || c == '\t'; |
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32 | } |
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33 | |||
34 | static void pnm_get(PNMContext *sc, char *str, int buf_size) |
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35 | { |
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36 | char *s; |
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37 | int c; |
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38 | |||
39 | /* skip spaces and comments */ |
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40 | while (sc->bytestream < sc->bytestream_end) { |
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41 | c = *sc->bytestream++; |
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42 | if (c == '#') { |
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43 | while (c != '\n' && sc->bytestream < sc->bytestream_end) { |
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44 | c = *sc->bytestream++; |
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45 | } |
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46 | } else if (!pnm_space(c)) { |
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47 | break; |
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48 | } |
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49 | } |
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50 | |||
51 | s = str; |
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52 | while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) { |
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53 | if ((s - str) < buf_size - 1) |
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54 | *s++ = c; |
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55 | c = *sc->bytestream++; |
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56 | } |
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57 | *s = '\0'; |
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58 | } |
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59 | |||
60 | int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s) |
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61 | { |
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62 | char buf1[32], tuple_type[32]; |
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63 | int h, w, depth, maxval; |
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64 | |||
65 | pnm_get(s, buf1, sizeof(buf1)); |
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66 | s->type= buf1[1]-'0'; |
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67 | if(buf1[0] != 'P') |
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68 | return AVERROR_INVALIDDATA; |
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69 | |||
70 | if (s->type==1 || s->type==4) { |
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71 | avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
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72 | } else if (s->type==2 || s->type==5) { |
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73 | if (avctx->codec_id == AV_CODEC_ID_PGMYUV) |
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74 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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75 | else |
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76 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
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77 | } else if (s->type==3 || s->type==6) { |
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78 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
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79 | } else if (s->type==7) { |
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80 | w = -1; |
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81 | h = -1; |
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82 | maxval = -1; |
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83 | depth = -1; |
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84 | tuple_type[0] = '\0'; |
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85 | for (;;) { |
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86 | pnm_get(s, buf1, sizeof(buf1)); |
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87 | if (!strcmp(buf1, "WIDTH")) { |
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88 | pnm_get(s, buf1, sizeof(buf1)); |
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89 | w = strtol(buf1, NULL, 10); |
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90 | } else if (!strcmp(buf1, "HEIGHT")) { |
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91 | pnm_get(s, buf1, sizeof(buf1)); |
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92 | h = strtol(buf1, NULL, 10); |
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93 | } else if (!strcmp(buf1, "DEPTH")) { |
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94 | pnm_get(s, buf1, sizeof(buf1)); |
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95 | depth = strtol(buf1, NULL, 10); |
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96 | } else if (!strcmp(buf1, "MAXVAL")) { |
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97 | pnm_get(s, buf1, sizeof(buf1)); |
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98 | maxval = strtol(buf1, NULL, 10); |
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99 | } else if (!strcmp(buf1, "TUPLTYPE") || |
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100 | /* libavcodec used to write invalid files */ |
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101 | !strcmp(buf1, "TUPLETYPE")) { |
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102 | pnm_get(s, tuple_type, sizeof(tuple_type)); |
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103 | } else if (!strcmp(buf1, "ENDHDR")) { |
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104 | break; |
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105 | } else { |
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106 | return AVERROR_INVALIDDATA; |
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107 | } |
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108 | } |
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109 | /* check that all tags are present */ |
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110 | if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end) |
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111 | return AVERROR_INVALIDDATA; |
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112 | |||
113 | avctx->width = w; |
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114 | avctx->height = h; |
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115 | s->maxval = maxval; |
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116 | if (depth == 1) { |
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117 | if (maxval == 1) { |
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118 | avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; |
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119 | } else if (maxval < 256) { |
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120 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
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121 | } else { |
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122 | avctx->pix_fmt = AV_PIX_FMT_GRAY16; |
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123 | } |
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124 | } else if (depth == 2) { |
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125 | if (maxval == 255) |
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126 | avctx->pix_fmt = AV_PIX_FMT_GRAY8A; |
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127 | } else if (depth == 3) { |
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128 | if (maxval < 256) { |
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129 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
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130 | } else { |
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131 | avctx->pix_fmt = AV_PIX_FMT_RGB48; |
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132 | } |
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133 | } else if (depth == 4) { |
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134 | if (maxval < 256) { |
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135 | avctx->pix_fmt = AV_PIX_FMT_RGBA; |
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136 | } else { |
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137 | avctx->pix_fmt = AV_PIX_FMT_RGBA64; |
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138 | } |
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139 | } else { |
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140 | return AVERROR_INVALIDDATA; |
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141 | } |
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142 | return 0; |
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143 | } else { |
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144 | return AVERROR_INVALIDDATA; |
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145 | } |
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146 | pnm_get(s, buf1, sizeof(buf1)); |
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147 | w = atoi(buf1); |
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148 | pnm_get(s, buf1, sizeof(buf1)); |
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149 | h = atoi(buf1); |
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150 | if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end) |
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151 | return AVERROR_INVALIDDATA; |
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152 | |||
153 | avctx->width = w; |
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154 | avctx->height = h; |
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155 | |||
156 | if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) { |
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157 | pnm_get(s, buf1, sizeof(buf1)); |
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158 | s->maxval = atoi(buf1); |
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159 | if (s->maxval <= 0) { |
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160 | av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval); |
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161 | s->maxval = 255; |
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162 | } |
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163 | if (s->maxval >= 256) { |
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164 | if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) { |
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165 | avctx->pix_fmt = AV_PIX_FMT_GRAY16; |
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166 | } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) { |
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167 | avctx->pix_fmt = AV_PIX_FMT_RGB48; |
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168 | } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) { |
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169 | if (s->maxval < 512) |
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170 | avctx->pix_fmt = AV_PIX_FMT_YUV420P9; |
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171 | else if (s->maxval < 1024) |
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172 | avctx->pix_fmt = AV_PIX_FMT_YUV420P10; |
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173 | else |
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174 | avctx->pix_fmt = AV_PIX_FMT_YUV420P16; |
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175 | } else { |
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176 | av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n"); |
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177 | avctx->pix_fmt = AV_PIX_FMT_NONE; |
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178 | return AVERROR_INVALIDDATA; |
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179 | } |
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180 | } |
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181 | }else |
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182 | s->maxval=1; |
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183 | /* more check if YUV420 */ |
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184 | if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) { |
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185 | if ((avctx->width & 1) != 0) |
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186 | return AVERROR_INVALIDDATA; |
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187 | h = (avctx->height * 2); |
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188 | if ((h % 3) != 0) |
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189 | return AVERROR_INVALIDDATA; |
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190 | h /= 3; |
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191 | avctx->height = h; |
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192 | } |
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193 | return 0; |
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194 | }>>>=>=>=>>>>=>=>=>=>>>>> |