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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2012 Clément Bœsch |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | /** |
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22 | * @file |
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23 | * JACOsub subtitle demuxer |
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24 | * @see http://unicorn.us.com/jacosub/jscripts.html |
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25 | * @todo Support P[ALETTE] directive. |
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26 | */ |
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27 | |||
28 | #include "avformat.h" |
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29 | #include "internal.h" |
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30 | #include "subtitles.h" |
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31 | #include "libavcodec/internal.h" |
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32 | #include "libavcodec/jacosub.h" |
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33 | #include "libavutil/avstring.h" |
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34 | #include "libavutil/bprint.h" |
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35 | #include "libavutil/intreadwrite.h" |
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36 | |||
37 | typedef struct { |
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38 | int shift; |
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39 | unsigned timeres; |
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40 | FFDemuxSubtitlesQueue q; |
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41 | } JACOsubContext; |
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42 | |||
43 | static int timed_line(const char *ptr) |
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44 | { |
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45 | char c; |
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46 | return (sscanf(ptr, "%*u:%*u:%*u.%*u %*u:%*u:%*u.%*u %c", &c) == 1 || |
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47 | sscanf(ptr, "@%*u @%*u %c", &c) == 1); |
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48 | } |
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49 | |||
50 | static int jacosub_probe(AVProbeData *p) |
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51 | { |
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52 | const char *ptr = p->buf; |
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53 | const char *ptr_end = p->buf + p->buf_size; |
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54 | |||
55 | if (AV_RB24(ptr) == 0xEFBBBF) |
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56 | ptr += 3; /* skip UTF-8 BOM */ |
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57 | |||
58 | while (ptr < ptr_end) { |
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59 | while (jss_whitespace(*ptr)) |
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60 | ptr++; |
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61 | if (*ptr != '#' && *ptr != '\n') { |
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62 | if (timed_line(ptr)) |
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63 | return AVPROBE_SCORE_EXTENSION + 1; |
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64 | return 0; |
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65 | } |
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66 | ptr += ff_subtitles_next_line(ptr); |
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67 | } |
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68 | return 0; |
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69 | } |
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70 | |||
71 | static const char * const cmds[] = { |
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72 | "CLOCKPAUSE", |
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73 | "DIRECTIVE", |
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74 | "FONT", |
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75 | "HRES", |
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76 | "INCLUDE", |
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77 | "PALETTE", |
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78 | "QUANTIZE", |
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79 | "RAMP", |
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80 | "SHIFT", |
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81 | "TIMERES", |
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82 | }; |
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83 | |||
84 | static int get_jss_cmd(char k) |
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85 | { |
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86 | int i; |
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87 | |||
88 | k = av_toupper(k); |
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89 | for (i = 0; i < FF_ARRAY_ELEMS(cmds); i++) |
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90 | if (k == cmds[i][0]) |
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91 | return i; |
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92 | return -1; |
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93 | } |
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94 | |||
95 | static int jacosub_read_close(AVFormatContext *s) |
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96 | { |
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97 | JACOsubContext *jacosub = s->priv_data; |
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98 | ff_subtitles_queue_clean(&jacosub->q); |
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99 | return 0; |
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100 | } |
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101 | |||
102 | static const char *read_ts(JACOsubContext *jacosub, const char *buf, |
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103 | int64_t *start, int *duration) |
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104 | { |
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105 | int len; |
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106 | unsigned hs, ms, ss, fs; // hours, minutes, seconds, frame start |
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107 | unsigned he, me, se, fe; // hours, minutes, seconds, frame end |
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108 | int ts_start, ts_end; |
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109 | |||
110 | /* timed format */ |
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111 | if (sscanf(buf, "%u:%u:%u.%u %u:%u:%u.%u %n", |
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112 | &hs, &ms, &ss, &fs, |
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113 | &he, &me, &se, &fe, &len) == 8) { |
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114 | ts_start = (hs*3600 + ms*60 + ss) * jacosub->timeres + fs; |
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115 | ts_end = (he*3600 + me*60 + se) * jacosub->timeres + fe; |
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116 | goto shift_and_ret; |
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117 | } |
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118 | |||
119 | /* timestamps format */ |
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120 | if (sscanf(buf, "@%u @%u %n", &ts_start, &ts_end, &len) == 2) |
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121 | goto shift_and_ret; |
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122 | |||
123 | return NULL; |
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124 | |||
125 | shift_and_ret: |
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126 | ts_start = (ts_start + jacosub->shift) * 100 / jacosub->timeres; |
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127 | ts_end = (ts_end + jacosub->shift) * 100 / jacosub->timeres; |
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128 | *start = ts_start; |
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129 | *duration = ts_start + ts_end; |
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130 | return buf + len; |
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131 | } |
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132 | |||
133 | static int get_shift(int timeres, const char *buf) |
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134 | { |
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135 | int sign = 1; |
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136 | int a = 0, b = 0, c = 0, d = 0; |
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137 | #define SSEP "%*1[.:]" |
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138 | int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d); |
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139 | #undef SSEP |
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140 | |||
141 | if (*buf == '-' || a < 0) { |
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142 | sign = -1; |
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143 | a = FFABS(a); |
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144 | } |
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145 | |||
146 | switch (n) { |
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147 | case 4: return sign * ((a*3600 + b*60 + c) * timeres + d); |
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148 | case 3: return sign * (( a*60 + b) * timeres + c); |
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149 | case 2: return sign * (( a) * timeres + b); |
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150 | } |
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151 | |||
152 | return 0; |
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153 | } |
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154 | |||
155 | static int jacosub_read_header(AVFormatContext *s) |
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156 | { |
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157 | AVBPrint header; |
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158 | AVIOContext *pb = s->pb; |
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159 | char line[JSS_MAX_LINESIZE]; |
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160 | JACOsubContext *jacosub = s->priv_data; |
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161 | int shift_set = 0; // only the first shift matters |
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162 | int merge_line = 0; |
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163 | int i, ret; |
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164 | |||
165 | AVStream *st = avformat_new_stream(s, NULL); |
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166 | if (!st) |
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167 | return AVERROR(ENOMEM); |
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168 | avpriv_set_pts_info(st, 64, 1, 100); |
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169 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
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170 | st->codec->codec_id = AV_CODEC_ID_JACOSUB; |
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171 | |||
172 | jacosub->timeres = 30; |
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173 | |||
174 | av_bprint_init(&header, 1024+FF_INPUT_BUFFER_PADDING_SIZE, 4096); |
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175 | |||
176 | while (!url_feof(pb)) { |
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177 | int cmd_len; |
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178 | const char *p = line; |
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179 | int64_t pos = avio_tell(pb); |
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180 | int len = ff_get_line(pb, line, sizeof(line)); |
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181 | |||
182 | p = jss_skip_whitespace(p); |
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183 | |||
184 | /* queue timed line */ |
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185 | if (merge_line || timed_line(p)) { |
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186 | AVPacket *sub; |
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187 | |||
188 | sub = ff_subtitles_queue_insert(&jacosub->q, line, len, merge_line); |
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189 | if (!sub) |
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190 | return AVERROR(ENOMEM); |
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191 | sub->pos = pos; |
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192 | merge_line = len > 1 && !strcmp(&line[len - 2], "\\\n"); |
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193 | continue; |
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194 | } |
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195 | |||
196 | /* skip all non-compiler commands and focus on the command */ |
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197 | if (*p != '#') |
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198 | continue; |
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199 | p++; |
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200 | i = get_jss_cmd(p[0]); |
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201 | if (i == -1) |
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202 | continue; |
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203 | |||
204 | /* trim command + spaces */ |
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205 | cmd_len = strlen(cmds[i]); |
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206 | if (av_strncasecmp(p, cmds[i], cmd_len) == 0) |
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207 | p += cmd_len; |
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208 | else |
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209 | p++; |
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210 | p = jss_skip_whitespace(p); |
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211 | |||
212 | /* handle commands which affect the whole script */ |
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213 | switch (cmds[i][0]) { |
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214 | case 'S': // SHIFT command affect the whole script... |
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215 | if (!shift_set) { |
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216 | jacosub->shift = get_shift(jacosub->timeres, p); |
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217 | shift_set = 1; |
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218 | } |
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219 | av_bprintf(&header, "#S %s", p); |
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220 | break; |
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221 | case 'T': // ...but must be placed after TIMERES |
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222 | jacosub->timeres = strtol(p, NULL, 10); |
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223 | if (!jacosub->timeres) |
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224 | jacosub->timeres = 30; |
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225 | else |
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226 | av_bprintf(&header, "#T %s", p); |
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227 | break; |
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228 | } |
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229 | } |
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230 | |||
231 | /* general/essential directives in the extradata */ |
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232 | ret = avpriv_bprint_to_extradata(st->codec, &header); |
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233 | if (ret < 0) |
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234 | return ret; |
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235 | |||
236 | /* SHIFT and TIMERES affect the whole script so packet timing can only be |
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237 | * done in a second pass */ |
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238 | for (i = 0; i < jacosub->q.nb_subs; i++) { |
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239 | AVPacket *sub = &jacosub->q.subs[i]; |
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240 | read_ts(jacosub, sub->data, &sub->pts, &sub->duration); |
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241 | } |
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242 | ff_subtitles_queue_finalize(&jacosub->q); |
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243 | |||
244 | return 0; |
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245 | } |
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246 | |||
247 | static int jacosub_read_packet(AVFormatContext *s, AVPacket *pkt) |
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248 | { |
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249 | JACOsubContext *jacosub = s->priv_data; |
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250 | return ff_subtitles_queue_read_packet(&jacosub->q, pkt); |
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251 | } |
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252 | |||
253 | static int jacosub_read_seek(AVFormatContext *s, int stream_index, |
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254 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
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255 | { |
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256 | JACOsubContext *jacosub = s->priv_data; |
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257 | return ff_subtitles_queue_seek(&jacosub->q, s, stream_index, |
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258 | min_ts, ts, max_ts, flags); |
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259 | } |
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260 | |||
261 | AVInputFormat ff_jacosub_demuxer = { |
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262 | .name = "jacosub", |
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263 | .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle format"), |
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264 | .priv_data_size = sizeof(JACOsubContext), |
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265 | .read_probe = jacosub_probe, |
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266 | .read_header = jacosub_read_header, |
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267 | .read_packet = jacosub_read_packet, |
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268 | .read_seek2 = jacosub_read_seek, |
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269 | .read_close = jacosub_read_close, |
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270 | };>>>>> |