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6147 | serge | 1 | /* |
2 | * Silicon Graphics RLE 8-bit video decoder |
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3 | * Copyright (c) 2012 Peter Ross |
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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 | * Silicon Graphics RLE 8-bit video decoder |
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25 | * @note Data is packed in rbg323 with rle, contained in mv or mov. |
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26 | * The algorithm and pixfmt are subtly different from SGI images. |
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27 | */ |
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28 | |||
29 | #include "libavutil/common.h" |
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30 | |||
31 | #include "avcodec.h" |
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32 | #include "internal.h" |
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33 | |||
34 | typedef struct SGIRLEContext { |
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35 | AVFrame *frame; |
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36 | } SGIRLEContext; |
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37 | |||
38 | static av_cold int sgirle_decode_init(AVCodecContext *avctx) |
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39 | { |
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40 | SGIRLEContext *s = avctx->priv_data; |
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41 | avctx->pix_fmt = AV_PIX_FMT_BGR8; |
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42 | s->frame = av_frame_alloc(); |
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43 | if (!s->frame) |
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44 | return AVERROR(ENOMEM); |
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45 | return 0; |
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46 | } |
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47 | |||
48 | /** |
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49 | * Convert SGI RBG323 pixel into AV_PIX_FMT_BGR8 |
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50 | * SGI RGB data is packed as 8bpp, (msb)3R 2B 3G(lsb) |
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51 | */ |
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52 | #define RBG323_TO_BGR8(x) ((((x) << 3) & 0xC0) | \ |
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53 | (((x) << 3) & 0x38) | \ |
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54 | (((x) >> 5) & 7)) |
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55 | static av_always_inline |
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56 | void rbg323_to_bgr8(uint8_t *dst, const uint8_t *src, int size) |
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57 | { |
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58 | int i; |
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59 | for (i = 0; i < size; i++) |
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60 | dst[i] = RBG323_TO_BGR8(src[i]); |
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61 | } |
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62 | |||
63 | /** |
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64 | * @param[out] dst Destination buffer |
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65 | * @param[in] src Source buffer |
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66 | * @param src_size Source buffer size (bytes) |
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67 | * @param width Width of destination buffer (pixels) |
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68 | * @param height Height of destination buffer (pixels) |
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69 | * @param linesize Line size of destination buffer (bytes) |
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70 | * |
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71 | * @return <0 on error |
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72 | */ |
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73 | static int decode_sgirle8(AVCodecContext *avctx, uint8_t *dst, |
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74 | const uint8_t *src, int src_size, |
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75 | int width, int height, ptrdiff_t linesize) |
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76 | { |
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77 | const uint8_t *src_end = src + src_size; |
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78 | int x = 0, y = 0; |
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79 | |||
80 | #define INC_XY(n) \ |
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81 | x += n; \ |
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82 | if (x >= width) { \ |
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83 | y++; \ |
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84 | if (y >= height) \ |
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85 | return 0; \ |
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86 | x = 0; \ |
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87 | } |
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88 | |||
89 | while (src_end - src >= 2) { |
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90 | uint8_t v = *src++; |
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91 | if (v > 0 && v < 0xC0) { |
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92 | do { |
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93 | int length = FFMIN(v, width - x); |
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94 | if (length <= 0) |
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95 | break; |
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96 | memset(dst + y * linesize + x, RBG323_TO_BGR8(*src), length); |
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97 | INC_XY(length); |
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98 | v -= length; |
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99 | } while (v > 0); |
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100 | src++; |
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101 | } else if (v >= 0xC1) { |
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102 | v -= 0xC0; |
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103 | do { |
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104 | int length = FFMIN3(v, width - x, src_end - src); |
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105 | if (src_end - src < length || length <= 0) |
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106 | break; |
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107 | rbg323_to_bgr8(dst + y * linesize + x, src, length); |
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108 | INC_XY(length); |
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109 | src += length; |
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110 | v -= length; |
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111 | } while (v > 0); |
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112 | } else { |
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113 | avpriv_request_sample(avctx, "opcode %d", v); |
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114 | return AVERROR_PATCHWELCOME; |
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115 | } |
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116 | } |
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117 | return 0; |
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118 | } |
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119 | |||
120 | static int sgirle_decode_frame(AVCodecContext *avctx, void *data, |
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121 | int *got_frame, AVPacket *avpkt) |
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122 | { |
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123 | SGIRLEContext *s = avctx->priv_data; |
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124 | int ret; |
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125 | |||
126 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
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127 | return ret; |
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128 | |||
129 | ret = decode_sgirle8(avctx, s->frame->data[0], avpkt->data, avpkt->size, |
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130 | avctx->width, avctx->height, s->frame->linesize[0]); |
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131 | if (ret < 0) |
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132 | return ret; |
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133 | |||
134 | *got_frame = 1; |
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135 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
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136 | return ret; |
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137 | |||
138 | return avpkt->size; |
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139 | } |
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140 | |||
141 | static av_cold int sgirle_decode_end(AVCodecContext *avctx) |
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142 | { |
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143 | SGIRLEContext *s = avctx->priv_data; |
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144 | |||
145 | av_frame_free(&s->frame); |
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146 | |||
147 | return 0; |
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148 | } |
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149 | |||
150 | AVCodec ff_sgirle_decoder = { |
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151 | .name = "sgirle", |
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152 | .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics RLE 8-bit video"), |
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153 | .type = AVMEDIA_TYPE_VIDEO, |
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154 | .id = AV_CODEC_ID_SGIRLE, |
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155 | .priv_data_size = sizeof(SGIRLEContext), |
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156 | .init = sgirle_decode_init, |
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157 | .close = sgirle_decode_end, |
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158 | .decode = sgirle_decode_frame, |
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159 | .capabilities = AV_CODEC_CAP_DR1, |
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160 | };>>>=>>=>>0>>><>><> |