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4349 | Serge | 1 | /* |
2 | * LCL (LossLess Codec Library) Codec |
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3 | * Copyright (c) 2002-2004 Roberto Togni |
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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 | * LCL (LossLess Codec Library) Video Codec |
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25 | * Decoder for MSZH and ZLIB codecs |
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26 | * Experimental encoder for ZLIB RGB24 |
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27 | * |
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28 | * Fourcc: MSZH, ZLIB |
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29 | * |
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30 | * Original Win32 dll: |
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31 | * Ver2.23 By Kenji Oshima 2000.09.20 |
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32 | * avimszh.dll, avizlib.dll |
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33 | * |
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34 | * A description of the decoding algorithm can be found here: |
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35 | * http://www.pcisys.net/~melanson/codecs |
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36 | * |
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37 | * Supports: BGR24 (RGB 24bpp) |
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38 | * |
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39 | */ |
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40 | |||
41 | #include |
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42 | #include |
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43 | |||
44 | #include "libavutil/avassert.h" |
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45 | #include "avcodec.h" |
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46 | #include "internal.h" |
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47 | #include "lcl.h" |
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48 | #include "libavutil/internal.h" |
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49 | #include "libavutil/mem.h" |
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50 | |||
51 | #include |
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52 | |||
53 | /* |
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54 | * Decoder context |
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55 | */ |
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56 | typedef struct LclEncContext { |
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57 | |||
58 | AVCodecContext *avctx; |
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59 | |||
60 | // Image type |
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61 | int imgtype; |
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62 | // Compression type |
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63 | int compression; |
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64 | // Flags |
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65 | int flags; |
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66 | z_stream zstream; |
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67 | } LclEncContext; |
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68 | |||
69 | /* |
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70 | * |
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71 | * Encode a frame |
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72 | * |
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73 | */ |
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74 | static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
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75 | const AVFrame *p, int *got_packet) |
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76 | { |
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77 | LclEncContext *c = avctx->priv_data; |
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78 | int i, ret; |
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79 | int zret; // Zlib return code |
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80 | int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3); |
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81 | |||
82 | if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0) |
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83 | return ret; |
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84 | |||
85 | if(avctx->pix_fmt != AV_PIX_FMT_BGR24){ |
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86 | av_log(avctx, AV_LOG_ERROR, "Format not supported!\n"); |
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87 | return -1; |
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88 | } |
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89 | |||
90 | zret = deflateReset(&c->zstream); |
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91 | if (zret != Z_OK) { |
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92 | av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret); |
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93 | return -1; |
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94 | } |
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95 | c->zstream.next_out = pkt->data; |
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96 | c->zstream.avail_out = pkt->size; |
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97 | |||
98 | for(i = avctx->height - 1; i >= 0; i--) { |
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99 | c->zstream.next_in = p->data[0]+p->linesize[0]*i; |
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100 | c->zstream.avail_in = avctx->width*3; |
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101 | zret = deflate(&c->zstream, Z_NO_FLUSH); |
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102 | if (zret != Z_OK) { |
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103 | av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); |
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104 | return -1; |
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105 | } |
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106 | } |
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107 | zret = deflate(&c->zstream, Z_FINISH); |
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108 | if (zret != Z_STREAM_END) { |
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109 | av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); |
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110 | return -1; |
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111 | } |
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112 | |||
113 | pkt->size = c->zstream.total_out; |
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114 | pkt->flags |= AV_PKT_FLAG_KEY; |
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115 | *got_packet = 1; |
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116 | |||
117 | return 0; |
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118 | } |
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119 | |||
120 | /* |
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121 | * |
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122 | * Init lcl encoder |
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123 | * |
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124 | */ |
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125 | static av_cold int encode_init(AVCodecContext *avctx) |
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126 | { |
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127 | LclEncContext *c = avctx->priv_data; |
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128 | int zret; // Zlib return code |
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129 | |||
130 | c->avctx= avctx; |
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131 | |||
132 | av_assert0(avctx->width && avctx->height); |
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133 | |||
134 | avctx->extradata = av_mallocz(8 + FF_INPUT_BUFFER_PADDING_SIZE); |
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135 | if (!avctx->extradata) |
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136 | return AVERROR(ENOMEM); |
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137 | |||
138 | c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ? |
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139 | COMP_ZLIB_NORMAL : |
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140 | av_clip(avctx->compression_level, 0, 9); |
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141 | c->flags = 0; |
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142 | c->imgtype = IMGTYPE_RGB24; |
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143 | avctx->bits_per_coded_sample= 24; |
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144 | |||
145 | avctx->extradata[0]= 4; |
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146 | avctx->extradata[1]= 0; |
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147 | avctx->extradata[2]= 0; |
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148 | avctx->extradata[3]= 0; |
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149 | avctx->extradata[4]= c->imgtype; |
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150 | avctx->extradata[5]= c->compression; |
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151 | avctx->extradata[6]= c->flags; |
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152 | avctx->extradata[7]= CODEC_ZLIB; |
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153 | c->avctx->extradata_size= 8; |
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154 | |||
155 | c->zstream.zalloc = Z_NULL; |
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156 | c->zstream.zfree = Z_NULL; |
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157 | c->zstream.opaque = Z_NULL; |
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158 | zret = deflateInit(&c->zstream, c->compression); |
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159 | if (zret != Z_OK) { |
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160 | av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret); |
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161 | return 1; |
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162 | } |
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163 | |||
164 | return 0; |
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165 | } |
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166 | |||
167 | /* |
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168 | * |
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169 | * Uninit lcl encoder |
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170 | * |
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171 | */ |
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172 | static av_cold int encode_end(AVCodecContext *avctx) |
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173 | { |
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174 | LclEncContext *c = avctx->priv_data; |
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175 | |||
176 | av_freep(&avctx->extradata); |
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177 | deflateEnd(&c->zstream); |
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178 | |||
179 | return 0; |
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180 | } |
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181 | |||
182 | AVCodec ff_zlib_encoder = { |
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183 | .name = "zlib", |
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184 | .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"), |
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185 | .type = AVMEDIA_TYPE_VIDEO, |
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186 | .id = AV_CODEC_ID_ZLIB, |
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187 | .priv_data_size = sizeof(LclEncContext), |
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188 | .init = encode_init, |
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189 | .encode2 = encode_frame, |
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190 | .close = encode_end, |
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191 | .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE }, |
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192 | };> |