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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * Intel Indeo 2 codec |
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3 | * Copyright (c) 2005 Konstantin Shishkov |
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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 | /** |
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23 | * @file |
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24 | * Intel Indeo 2 decoder. |
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25 | */ |
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26 | |||
27 | #define BITSTREAM_READER_LE |
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28 | #include "libavutil/attributes.h" |
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29 | #include "avcodec.h" |
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30 | #include "get_bits.h" |
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31 | #include "indeo2data.h" |
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32 | #include "internal.h" |
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33 | #include "mathops.h" |
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34 | |||
35 | typedef struct Ir2Context{ |
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36 | AVCodecContext *avctx; |
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37 | AVFrame *picture; |
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38 | GetBitContext gb; |
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39 | int decode_delta; |
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40 | } Ir2Context; |
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41 | |||
42 | #define CODE_VLC_BITS 14 |
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43 | static VLC ir2_vlc; |
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44 | |||
45 | /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */ |
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46 | static inline int ir2_get_code(GetBitContext *gb) |
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47 | { |
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48 | return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1; |
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49 | } |
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50 | |||
51 | static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, |
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52 | int stride, const uint8_t *table) |
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53 | { |
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54 | int i; |
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55 | int j; |
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56 | int out = 0; |
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57 | int c; |
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58 | int t; |
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59 | |||
60 | if (width & 1) |
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61 | return AVERROR_INVALIDDATA; |
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62 | |||
63 | /* first line contain absolute values, other lines contain deltas */ |
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64 | while (out < width) { |
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65 | c = ir2_get_code(&ctx->gb); |
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66 | if (c >= 0x80) { /* we have a run */ |
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67 | c -= 0x7F; |
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68 | if (out + c*2 > width) |
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69 | return AVERROR_INVALIDDATA; |
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70 | for (i = 0; i < c * 2; i++) |
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71 | dst[out++] = 0x80; |
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72 | } else { /* copy two values from table */ |
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73 | dst[out++] = table[c * 2]; |
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74 | dst[out++] = table[(c * 2) + 1]; |
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75 | } |
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76 | } |
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77 | dst += stride; |
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78 | |||
79 | for (j = 1; j < height; j++) { |
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80 | out = 0; |
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81 | while (out < width) { |
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82 | c = ir2_get_code(&ctx->gb); |
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83 | if (c >= 0x80) { /* we have a skip */ |
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84 | c -= 0x7F; |
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85 | if (out + c*2 > width) |
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86 | return AVERROR_INVALIDDATA; |
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87 | for (i = 0; i < c * 2; i++) { |
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88 | dst[out] = dst[out - stride]; |
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89 | out++; |
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90 | } |
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91 | } else { /* add two deltas from table */ |
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92 | t = dst[out - stride] + (table[c * 2] - 128); |
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93 | t = av_clip_uint8(t); |
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94 | dst[out] = t; |
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95 | out++; |
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96 | t = dst[out - stride] + (table[(c * 2) + 1] - 128); |
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97 | t = av_clip_uint8(t); |
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98 | dst[out] = t; |
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99 | out++; |
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100 | } |
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101 | } |
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102 | dst += stride; |
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103 | } |
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104 | return 0; |
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105 | } |
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106 | |||
107 | static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, |
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108 | int stride, const uint8_t *table) |
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109 | { |
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110 | int j; |
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111 | int out = 0; |
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112 | int c; |
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113 | int t; |
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114 | |||
115 | if (width & 1) |
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116 | return AVERROR_INVALIDDATA; |
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117 | |||
118 | for (j = 0; j < height; j++) { |
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119 | out = 0; |
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120 | while (out < width) { |
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121 | c = ir2_get_code(&ctx->gb); |
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122 | if (c >= 0x80) { /* we have a skip */ |
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123 | c -= 0x7F; |
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124 | out += c * 2; |
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125 | } else { /* add two deltas from table */ |
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126 | t = dst[out] + (((table[c * 2] - 128)*3) >> 2); |
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127 | t = av_clip_uint8(t); |
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128 | dst[out] = t; |
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129 | out++; |
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130 | t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2); |
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131 | t = av_clip_uint8(t); |
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132 | dst[out] = t; |
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133 | out++; |
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134 | } |
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135 | } |
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136 | dst += stride; |
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137 | } |
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138 | return 0; |
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139 | } |
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140 | |||
141 | static int ir2_decode_frame(AVCodecContext *avctx, |
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142 | void *data, int *got_frame, |
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143 | AVPacket *avpkt) |
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144 | { |
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145 | Ir2Context * const s = avctx->priv_data; |
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146 | const uint8_t *buf = avpkt->data; |
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147 | int buf_size = avpkt->size; |
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148 | AVFrame *picture = data; |
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149 | AVFrame * const p = s->picture; |
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150 | int start, ret; |
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151 | |||
152 | if ((ret = ff_reget_buffer(avctx, p)) < 0) |
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153 | return ret; |
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154 | |||
155 | start = 48; /* hardcoded for now */ |
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156 | |||
157 | if (start >= buf_size) { |
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158 | av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size); |
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159 | return AVERROR_INVALIDDATA; |
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160 | } |
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161 | |||
162 | s->decode_delta = buf[18]; |
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163 | |||
164 | /* decide whether frame uses deltas or not */ |
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165 | #ifndef BITSTREAM_READER_LE |
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166 | for (i = 0; i < buf_size; i++) |
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167 | buf[i] = ff_reverse[buf[i]]; |
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168 | #endif |
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169 | |||
170 | init_get_bits(&s->gb, buf + start, (buf_size - start) * 8); |
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171 | |||
172 | if (s->decode_delta) { /* intraframe */ |
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173 | if ((ret = ir2_decode_plane(s, avctx->width, avctx->height, |
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174 | s->picture->data[0], s->picture->linesize[0], |
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175 | ir2_luma_table)) < 0) |
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176 | return ret; |
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177 | |||
178 | /* swapped U and V */ |
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179 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
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180 | s->picture->data[2], s->picture->linesize[2], |
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181 | ir2_luma_table)) < 0) |
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182 | return ret; |
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183 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
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184 | s->picture->data[1], s->picture->linesize[1], |
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185 | ir2_luma_table)) < 0) |
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186 | return ret; |
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187 | } else { /* interframe */ |
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188 | if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height, |
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189 | s->picture->data[0], s->picture->linesize[0], |
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190 | ir2_luma_table)) < 0) |
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191 | return ret; |
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192 | /* swapped U and V */ |
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193 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
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194 | s->picture->data[2], s->picture->linesize[2], |
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195 | ir2_luma_table)) < 0) |
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196 | return ret; |
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197 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
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198 | s->picture->data[1], s->picture->linesize[1], |
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199 | ir2_luma_table)) < 0) |
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200 | return ret; |
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201 | } |
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202 | |||
203 | if ((ret = av_frame_ref(picture, s->picture)) < 0) |
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204 | return ret; |
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205 | |||
206 | *got_frame = 1; |
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207 | |||
208 | return buf_size; |
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209 | } |
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210 | |||
211 | static av_cold int ir2_decode_init(AVCodecContext *avctx) |
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212 | { |
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213 | Ir2Context * const ic = avctx->priv_data; |
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214 | static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2]; |
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215 | |||
216 | ic->avctx = avctx; |
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217 | |||
218 | avctx->pix_fmt= AV_PIX_FMT_YUV410P; |
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219 | |||
220 | ic->picture = av_frame_alloc(); |
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221 | if (!ic->picture) |
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222 | return AVERROR(ENOMEM); |
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223 | |||
224 | ir2_vlc.table = vlc_tables; |
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225 | ir2_vlc.table_allocated = 1 << CODE_VLC_BITS; |
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226 | #ifdef BITSTREAM_READER_LE |
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227 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, |
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228 | &ir2_codes[0][1], 4, 2, |
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229 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE); |
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230 | #else |
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231 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, |
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232 | &ir2_codes[0][1], 4, 2, |
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233 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC); |
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234 | #endif |
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235 | |||
236 | return 0; |
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237 | } |
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238 | |||
239 | static av_cold int ir2_decode_end(AVCodecContext *avctx) |
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240 | { |
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241 | Ir2Context * const ic = avctx->priv_data; |
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242 | |||
243 | av_frame_free(&ic->picture); |
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244 | |||
245 | return 0; |
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246 | } |
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247 | |||
248 | AVCodec ff_indeo2_decoder = { |
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249 | .name = "indeo2", |
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250 | .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"), |
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251 | .type = AVMEDIA_TYPE_VIDEO, |
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252 | .id = AV_CODEC_ID_INDEO2, |
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253 | .priv_data_size = sizeof(Ir2Context), |
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254 | .init = ir2_decode_init, |
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255 | .close = ir2_decode_end, |
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256 | .decode = ir2_decode_frame, |
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257 | .capabilities = CODEC_CAP_DR1, |
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258 | };><>><>>>>>>>>>>>>>>>>> |