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Rev | Author | Line No. | Line |
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6147 | serge | 1 | /* |
2 | * Binary text demuxer |
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3 | * eXtended BINary text (XBIN) demuxer |
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4 | * Artworx Data Format demuxer |
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5 | * iCEDraw File demuxer |
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6 | * Copyright (c) 2010 Peter Ross |
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7 | * |
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8 | * This file is part of FFmpeg. |
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9 | * |
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10 | * FFmpeg is free software; you can redistribute it and/or |
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11 | * modify it under the terms of the GNU Lesser General Public |
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12 | * License as published by the Free Software Foundation; either |
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13 | * version 2.1 of the License, or (at your option) any later version. |
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14 | * |
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15 | * FFmpeg is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * Lesser General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU Lesser General Public |
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21 | * License along with FFmpeg; if not, write to the Free Software |
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22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |||
25 | /** |
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26 | * @file |
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27 | * Binary text demuxer |
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28 | * eXtended BINary text (XBIN) demuxer |
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29 | * Artworx Data Format demuxer |
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30 | * iCEDraw File demuxer |
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31 | */ |
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32 | |||
33 | #include "libavutil/intreadwrite.h" |
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34 | #include "libavutil/opt.h" |
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35 | #include "libavutil/parseutils.h" |
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36 | #include "avformat.h" |
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37 | #include "internal.h" |
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38 | #include "sauce.h" |
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39 | #include "libavcodec/bintext.h" |
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40 | |||
41 | typedef struct { |
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42 | const AVClass *class; |
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43 | int chars_per_frame; /**< characters to send decoder per frame; |
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44 | set by private options as characters per second, and then |
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45 | converted to characters per frame at runtime */ |
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46 | int width, height; /**< video size (WxH pixels) (private option) */ |
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47 | AVRational framerate; /**< frames per second (private option) */ |
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48 | uint64_t fsize; /**< file size less metadata buffer */ |
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49 | } BinDemuxContext; |
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50 | |||
51 | static AVStream * init_stream(AVFormatContext *s) |
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52 | { |
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53 | BinDemuxContext *bin = s->priv_data; |
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54 | AVStream *st = avformat_new_stream(s, NULL); |
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55 | if (!st) |
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56 | return NULL; |
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57 | st->codec->codec_tag = 0; |
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58 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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59 | |||
60 | if (!bin->width) { |
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61 | st->codec->width = (80<<3); |
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62 | st->codec->height = (25<<4); |
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63 | } |
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64 | |||
65 | avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num); |
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66 | |||
67 | /* simulate tty display speed */ |
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68 | bin->chars_per_frame = av_clip(av_q2d(st->time_base) * bin->chars_per_frame, 1, INT_MAX); |
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69 | |||
70 | return st; |
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71 | } |
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72 | |||
73 | #if CONFIG_BINTEXT_DEMUXER | CONFIG_ADF_DEMUXER | CONFIG_IDF_DEMUXER |
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74 | /** |
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75 | * Given filesize and width, calculate height (assume font_height of 16) |
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76 | */ |
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77 | static void calculate_height(AVCodecContext *avctx, uint64_t fsize) |
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78 | { |
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79 | avctx->height = (fsize / ((avctx->width>>3)*2)) << 4; |
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80 | } |
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81 | #endif |
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82 | |||
83 | #if CONFIG_BINTEXT_DEMUXER |
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84 | static const uint8_t next_magic[]={ |
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85 | 0x1A, 0x1B, '[', '0', ';', '3', '0', ';', '4', '0', 'm', 'N', 'E', 'X', 'T', 0x00 |
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86 | }; |
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87 | |||
88 | static int next_tag_read(AVFormatContext *avctx, uint64_t *fsize) |
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89 | { |
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90 | AVIOContext *pb = avctx->pb; |
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91 | char buf[36]; |
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92 | int len; |
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93 | uint64_t start_pos = avio_size(pb) - 256; |
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94 | |||
95 | avio_seek(pb, start_pos, SEEK_SET); |
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96 | if (avio_read(pb, buf, sizeof(next_magic)) != sizeof(next_magic)) |
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97 | return -1; |
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98 | if (memcmp(buf, next_magic, sizeof(next_magic))) |
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99 | return -1; |
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100 | if (avio_r8(pb) != 0x01) |
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101 | return -1; |
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102 | |||
103 | *fsize -= 256; |
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104 | |||
105 | #define GET_EFI2_META(name,size) \ |
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106 | len = avio_r8(pb); \ |
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107 | if (len < 1 || len > size) \ |
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108 | return -1; \ |
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109 | if (avio_read(pb, buf, size) == size && *buf) { \ |
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110 | buf[len] = 0; \ |
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111 | av_dict_set(&avctx->metadata, name, buf, 0); \ |
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112 | } |
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113 | |||
114 | GET_EFI2_META("filename", 12) |
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115 | GET_EFI2_META("author", 20) |
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116 | GET_EFI2_META("publisher", 20) |
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117 | GET_EFI2_META("title", 35) |
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118 | |||
119 | return 0; |
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120 | } |
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121 | |||
122 | static void predict_width(AVCodecContext *avctx, uint64_t fsize, int got_width) |
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123 | { |
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124 | /** attempt to guess width */ |
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125 | if (!got_width) |
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126 | avctx->width = fsize > 4000 ? (160<<3) : (80<<3); |
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127 | } |
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128 | |||
129 | static int bintext_read_header(AVFormatContext *s) |
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130 | { |
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131 | BinDemuxContext *bin = s->priv_data; |
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132 | AVIOContext *pb = s->pb; |
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133 | |||
134 | AVStream *st = init_stream(s); |
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135 | if (!st) |
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136 | return AVERROR(ENOMEM); |
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137 | st->codec->codec_id = AV_CODEC_ID_BINTEXT; |
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138 | |||
139 | if (ff_alloc_extradata(st->codec, 2)) |
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140 | return AVERROR(ENOMEM); |
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141 | st->codec->extradata[0] = 16; |
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142 | st->codec->extradata[1] = 0; |
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143 | |||
144 | if (pb->seekable) { |
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145 | int got_width = 0; |
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146 | bin->fsize = avio_size(pb); |
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147 | if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0) |
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148 | next_tag_read(s, &bin->fsize); |
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149 | if (!bin->width) { |
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150 | predict_width(st->codec, bin->fsize, got_width); |
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151 | calculate_height(st->codec, bin->fsize); |
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152 | } |
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153 | avio_seek(pb, 0, SEEK_SET); |
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154 | } |
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155 | return 0; |
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156 | } |
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157 | #endif /* CONFIG_BINTEXT_DEMUXER */ |
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158 | |||
159 | #if CONFIG_XBIN_DEMUXER |
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160 | static int xbin_probe(AVProbeData *p) |
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161 | { |
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162 | const uint8_t *d = p->buf; |
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163 | |||
164 | if (AV_RL32(d) == MKTAG('X','B','I','N') && d[4] == 0x1A && |
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165 | AV_RL16(d+5) > 0 && AV_RL16(d+5) <= 160 && |
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166 | d[9] > 0 && d[9] <= 32) |
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167 | return AVPROBE_SCORE_MAX; |
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168 | return 0; |
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169 | } |
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170 | |||
171 | static int xbin_read_header(AVFormatContext *s) |
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172 | { |
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173 | BinDemuxContext *bin = s->priv_data; |
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174 | AVIOContext *pb = s->pb; |
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175 | char fontheight, flags; |
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176 | |||
177 | AVStream *st = init_stream(s); |
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178 | if (!st) |
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179 | return AVERROR(ENOMEM); |
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180 | |||
181 | avio_skip(pb, 5); |
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182 | st->codec->width = avio_rl16(pb)<<3; |
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183 | st->codec->height = avio_rl16(pb); |
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184 | fontheight = avio_r8(pb); |
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185 | st->codec->height *= fontheight; |
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186 | flags = avio_r8(pb); |
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187 | |||
188 | st->codec->extradata_size = 2; |
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189 | if ((flags & BINTEXT_PALETTE)) |
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190 | st->codec->extradata_size += 48; |
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191 | if ((flags & BINTEXT_FONT)) |
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192 | st->codec->extradata_size += fontheight * (flags & 0x10 ? 512 : 256); |
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193 | st->codec->codec_id = flags & 4 ? AV_CODEC_ID_XBIN : AV_CODEC_ID_BINTEXT; |
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194 | |||
195 | if (ff_alloc_extradata(st->codec, st->codec->extradata_size)) |
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196 | return AVERROR(ENOMEM); |
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197 | st->codec->extradata[0] = fontheight; |
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198 | st->codec->extradata[1] = flags; |
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199 | if (avio_read(pb, st->codec->extradata + 2, st->codec->extradata_size - 2) < 0) |
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200 | return AVERROR(EIO); |
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201 | |||
202 | if (pb->seekable) { |
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203 | bin->fsize = avio_size(pb) - 9 - st->codec->extradata_size; |
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204 | ff_sauce_read(s, &bin->fsize, NULL, 0); |
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205 | avio_seek(pb, 9 + st->codec->extradata_size, SEEK_SET); |
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206 | } |
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207 | |||
208 | return 0; |
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209 | } |
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210 | #endif /* CONFIG_XBIN_DEMUXER */ |
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211 | |||
212 | #if CONFIG_ADF_DEMUXER |
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213 | static int adf_read_header(AVFormatContext *s) |
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214 | { |
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215 | BinDemuxContext *bin = s->priv_data; |
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216 | AVIOContext *pb = s->pb; |
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217 | AVStream *st; |
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218 | |||
219 | if (avio_r8(pb) != 1) |
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220 | return AVERROR_INVALIDDATA; |
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221 | |||
222 | st = init_stream(s); |
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223 | if (!st) |
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224 | return AVERROR(ENOMEM); |
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225 | st->codec->codec_id = AV_CODEC_ID_BINTEXT; |
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226 | |||
227 | if (ff_alloc_extradata(st->codec, 2 + 48 + 4096)) |
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228 | return AVERROR(ENOMEM); |
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229 | st->codec->extradata[0] = 16; |
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230 | st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT; |
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231 | |||
232 | if (avio_read(pb, st->codec->extradata + 2, 24) < 0) |
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233 | return AVERROR(EIO); |
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234 | avio_skip(pb, 144); |
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235 | if (avio_read(pb, st->codec->extradata + 2 + 24, 24) < 0) |
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236 | return AVERROR(EIO); |
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237 | if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0) |
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238 | return AVERROR(EIO); |
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239 | |||
240 | if (pb->seekable) { |
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241 | int got_width = 0; |
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242 | bin->fsize = avio_size(pb) - 1 - 192 - 4096; |
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243 | st->codec->width = 80<<3; |
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244 | ff_sauce_read(s, &bin->fsize, &got_width, 0); |
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245 | if (!bin->width) |
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246 | calculate_height(st->codec, bin->fsize); |
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247 | avio_seek(pb, 1 + 192 + 4096, SEEK_SET); |
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248 | } |
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249 | return 0; |
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250 | } |
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251 | #endif /* CONFIG_ADF_DEMUXER */ |
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252 | |||
253 | #if CONFIG_IDF_DEMUXER |
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254 | static const uint8_t idf_magic[] = { |
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255 | 0x04, 0x31, 0x2e, 0x34, 0x00, 0x00, 0x00, 0x00, 0x4f, 0x00, 0x15, 0x00 |
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256 | }; |
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257 | |||
258 | static int idf_probe(AVProbeData *p) |
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259 | { |
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260 | if (p->buf_size < sizeof(idf_magic)) |
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261 | return 0; |
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262 | if (!memcmp(p->buf, idf_magic, sizeof(idf_magic))) |
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263 | return AVPROBE_SCORE_MAX; |
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264 | return 0; |
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265 | } |
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266 | |||
267 | static int idf_read_header(AVFormatContext *s) |
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268 | { |
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269 | BinDemuxContext *bin = s->priv_data; |
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270 | AVIOContext *pb = s->pb; |
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271 | AVStream *st; |
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272 | int got_width = 0; |
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273 | |||
274 | if (!pb->seekable) |
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275 | return AVERROR(EIO); |
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276 | |||
277 | st = init_stream(s); |
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278 | if (!st) |
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279 | return AVERROR(ENOMEM); |
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280 | st->codec->codec_id = AV_CODEC_ID_IDF; |
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281 | |||
282 | if (ff_alloc_extradata(st->codec, 2 + 48 + 4096)) |
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283 | return AVERROR(ENOMEM); |
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284 | st->codec->extradata[0] = 16; |
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285 | st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT; |
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286 | |||
287 | avio_seek(pb, avio_size(pb) - 4096 - 48, SEEK_SET); |
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288 | |||
289 | if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0) |
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290 | return AVERROR(EIO); |
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291 | if (avio_read(pb, st->codec->extradata + 2, 48) < 0) |
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292 | return AVERROR(EIO); |
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293 | |||
294 | bin->fsize = avio_size(pb) - 12 - 4096 - 48; |
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295 | ff_sauce_read(s, &bin->fsize, &got_width, 0); |
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296 | if (!bin->width) |
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297 | calculate_height(st->codec, bin->fsize); |
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298 | avio_seek(pb, 12, SEEK_SET); |
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299 | return 0; |
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300 | } |
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301 | #endif /* CONFIG_IDF_DEMUXER */ |
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302 | |||
303 | static int read_packet(AVFormatContext *s, |
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304 | AVPacket *pkt) |
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305 | { |
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306 | BinDemuxContext *bin = s->priv_data; |
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307 | |||
308 | if (bin->fsize > 0) { |
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309 | if (av_get_packet(s->pb, pkt, bin->fsize) < 0) |
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310 | return AVERROR(EIO); |
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311 | bin->fsize = -1; /* done */ |
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312 | } else if (!bin->fsize) { |
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313 | if (avio_feof(s->pb)) |
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314 | return AVERROR(EIO); |
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315 | if (av_get_packet(s->pb, pkt, bin->chars_per_frame) < 0) |
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316 | return AVERROR(EIO); |
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317 | } else { |
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318 | return AVERROR(EIO); |
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319 | } |
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320 | |||
321 | pkt->flags |= AV_PKT_FLAG_KEY; |
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322 | return 0; |
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323 | } |
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324 | |||
325 | #define OFFSET(x) offsetof(BinDemuxContext, x) |
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326 | static const AVOption options[] = { |
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327 | { "linespeed", "set simulated line speed (bytes per second)", OFFSET(chars_per_frame), AV_OPT_TYPE_INT, {.i64 = 6000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM}, |
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328 | { "video_size", "set video size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, |
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329 | { "framerate", "set framerate (frames per second)", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, |
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330 | { NULL }, |
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331 | }; |
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332 | |||
333 | #define CLASS(name) \ |
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334 | (const AVClass[1]){{ \ |
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335 | .class_name = name, \ |
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336 | .item_name = av_default_item_name, \ |
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337 | .option = options, \ |
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338 | .version = LIBAVUTIL_VERSION_INT, \ |
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339 | }} |
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340 | |||
341 | #if CONFIG_BINTEXT_DEMUXER |
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342 | AVInputFormat ff_bintext_demuxer = { |
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343 | .name = "bin", |
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344 | .long_name = NULL_IF_CONFIG_SMALL("Binary text"), |
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345 | .priv_data_size = sizeof(BinDemuxContext), |
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346 | .read_header = bintext_read_header, |
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347 | .read_packet = read_packet, |
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348 | .extensions = "bin", |
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349 | .priv_class = CLASS("Binary text demuxer"), |
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350 | }; |
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351 | #endif |
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352 | |||
353 | #if CONFIG_XBIN_DEMUXER |
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354 | AVInputFormat ff_xbin_demuxer = { |
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355 | .name = "xbin", |
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356 | .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text (XBIN)"), |
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357 | .priv_data_size = sizeof(BinDemuxContext), |
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358 | .read_probe = xbin_probe, |
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359 | .read_header = xbin_read_header, |
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360 | .read_packet = read_packet, |
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361 | .priv_class = CLASS("eXtended BINary text (XBIN) demuxer"), |
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362 | }; |
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363 | #endif |
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364 | |||
365 | #if CONFIG_ADF_DEMUXER |
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366 | AVInputFormat ff_adf_demuxer = { |
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367 | .name = "adf", |
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368 | .long_name = NULL_IF_CONFIG_SMALL("Artworx Data Format"), |
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369 | .priv_data_size = sizeof(BinDemuxContext), |
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370 | .read_header = adf_read_header, |
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371 | .read_packet = read_packet, |
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372 | .extensions = "adf", |
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373 | .priv_class = CLASS("Artworx Data Format demuxer"), |
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374 | }; |
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375 | #endif |
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376 | |||
377 | #if CONFIG_IDF_DEMUXER |
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378 | AVInputFormat ff_idf_demuxer = { |
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379 | .name = "idf", |
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380 | .long_name = NULL_IF_CONFIG_SMALL("iCE Draw File"), |
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381 | .priv_data_size = sizeof(BinDemuxContext), |
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382 | .read_probe = idf_probe, |
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383 | .read_header = idf_read_header, |
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384 | .read_packet = read_packet, |
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385 | .extensions = "idf", |
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386 | .priv_class = CLASS("iCE Draw File demuxer"), |
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387 | }; |
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388 | #endif>>>>>3; |