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Rev | Author | Line No. | Line |
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6147 | serge | 1 | /* |
2 | * SubRip subtitle encoder |
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3 | * Copyright (c) 2010 Aurelien Jacobs |
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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 | #include |
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23 | #include "avcodec.h" |
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24 | #include "libavutil/avstring.h" |
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25 | #include "libavutil/bprint.h" |
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26 | #include "ass_split.h" |
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27 | #include "ass.h" |
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28 | |||
29 | |||
30 | #define SRT_STACK_SIZE 64 |
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31 | |||
32 | typedef struct { |
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33 | AVCodecContext *avctx; |
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34 | ASSSplitContext *ass_ctx; |
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35 | AVBPrint buffer; |
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36 | char stack[SRT_STACK_SIZE]; |
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37 | int stack_ptr; |
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38 | int alignment_applied; |
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39 | } SRTContext; |
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40 | |||
41 | |||
42 | #ifdef __GNUC__ |
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43 | __attribute__ ((__format__ (__printf__, 2, 3))) |
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44 | #endif |
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45 | static void srt_print(SRTContext *s, const char *str, ...) |
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46 | { |
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47 | va_list vargs; |
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48 | va_start(vargs, str); |
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49 | av_vbprintf(&s->buffer, str, vargs); |
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50 | va_end(vargs); |
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51 | } |
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52 | |||
53 | static int srt_stack_push(SRTContext *s, const char c) |
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54 | { |
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55 | if (s->stack_ptr >= SRT_STACK_SIZE) |
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56 | return -1; |
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57 | s->stack[s->stack_ptr++] = c; |
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58 | return 0; |
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59 | } |
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60 | |||
61 | static char srt_stack_pop(SRTContext *s) |
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62 | { |
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63 | if (s->stack_ptr <= 0) |
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64 | return 0; |
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65 | return s->stack[--s->stack_ptr]; |
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66 | } |
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67 | |||
68 | static int srt_stack_find(SRTContext *s, const char c) |
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69 | { |
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70 | int i; |
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71 | for (i = s->stack_ptr-1; i >= 0; i--) |
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72 | if (s->stack[i] == c) |
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73 | break; |
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74 | return i; |
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75 | } |
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76 | |||
77 | static void srt_close_tag(SRTContext *s, char tag) |
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78 | { |
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79 | srt_print(s, "%c%s>", tag, tag == 'f' ? "ont" : ""); |
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80 | } |
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81 | |||
82 | static void srt_stack_push_pop(SRTContext *s, const char c, int close) |
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83 | { |
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84 | if (close) { |
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85 | int i = c ? srt_stack_find(s, c) : 0; |
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86 | if (i < 0) |
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87 | return; |
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88 | while (s->stack_ptr != i) |
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89 | srt_close_tag(s, srt_stack_pop(s)); |
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90 | } else if (srt_stack_push(s, c) < 0) |
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91 | av_log(s->avctx, AV_LOG_ERROR, "tag stack overflow\n"); |
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92 | } |
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93 | |||
94 | static void srt_style_apply(SRTContext *s, const char *style) |
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95 | { |
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96 | ASSStyle *st = ff_ass_style_get(s->ass_ctx, style); |
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97 | if (st) { |
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98 | int c = st->primary_color & 0xFFFFFF; |
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99 | if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT) || |
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100 | st->font_size != ASS_DEFAULT_FONT_SIZE || |
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101 | c != ASS_DEFAULT_COLOR) { |
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102 | srt_print(s, " |
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103 | if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT)) |
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104 | srt_print(s, " face=\"%s\"", st->font_name); |
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105 | if (st->font_size != ASS_DEFAULT_FONT_SIZE) |
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106 | srt_print(s, " size=\"%d\"", st->font_size); |
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107 | if (c != ASS_DEFAULT_COLOR) |
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108 | srt_print(s, " color=\"#%06x\"", |
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109 | (c & 0xFF0000) >> 16 | c & 0xFF00 | (c & 0xFF) << 16); |
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110 | srt_print(s, ">"); |
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111 | srt_stack_push(s, 'f'); |
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112 | } |
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113 | if (st->bold != ASS_DEFAULT_BOLD) { |
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114 | srt_print(s, ""); |
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115 | srt_stack_push(s, 'b'); |
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116 | } |
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117 | if (st->italic != ASS_DEFAULT_ITALIC) { |
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118 | srt_print(s, ""); |
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119 | srt_stack_push(s, 'i'); |
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120 | } |
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121 | if (st->underline != ASS_DEFAULT_UNDERLINE) { |
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122 | srt_print(s, ""); |
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123 | srt_stack_push(s, 'u'); |
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124 | } |
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125 | if (st->alignment != ASS_DEFAULT_ALIGNMENT) { |
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126 | srt_print(s, "{\\an%d}", st->alignment); |
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127 | s->alignment_applied = 1; |
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128 | } |
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129 | } |
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130 | } |
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131 | |||
132 | |||
133 | static av_cold int srt_encode_init(AVCodecContext *avctx) |
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134 | { |
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135 | SRTContext *s = avctx->priv_data; |
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136 | s->avctx = avctx; |
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137 | s->ass_ctx = ff_ass_split(avctx->subtitle_header); |
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138 | av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED); |
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139 | return s->ass_ctx ? 0 : AVERROR_INVALIDDATA; |
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140 | } |
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141 | |||
142 | static void srt_text_cb(void *priv, const char *text, int len) |
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143 | { |
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144 | SRTContext *s = priv; |
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145 | av_bprint_append_data(&s->buffer, text, len); |
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146 | } |
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147 | |||
148 | static void srt_new_line_cb(void *priv, int forced) |
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149 | { |
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150 | srt_print(priv, "\r\n"); |
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151 | } |
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152 | |||
153 | static void srt_style_cb(void *priv, char style, int close) |
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154 | { |
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155 | srt_stack_push_pop(priv, style, close); |
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156 | if (!close) |
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157 | srt_print(priv, "<%c>", style); |
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158 | } |
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159 | |||
160 | static void srt_color_cb(void *priv, unsigned int color, unsigned int color_id) |
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161 | { |
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162 | if (color_id > 1) |
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163 | return; |
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164 | srt_stack_push_pop(priv, 'f', color == 0xFFFFFFFF); |
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165 | if (color != 0xFFFFFFFF) |
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166 | srt_print(priv, "", |
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167 | (color & 0xFF0000) >> 16 | color & 0xFF00 | (color & 0xFF) << 16); |
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168 | } |
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169 | |||
170 | static void srt_font_name_cb(void *priv, const char *name) |
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171 | { |
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172 | srt_stack_push_pop(priv, 'f', !name); |
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173 | if (name) |
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174 | srt_print(priv, "", name); |
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175 | } |
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176 | |||
177 | static void srt_font_size_cb(void *priv, int size) |
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178 | { |
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179 | srt_stack_push_pop(priv, 'f', size < 0); |
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180 | if (size >= 0) |
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181 | srt_print(priv, "", size); |
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182 | } |
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183 | |||
184 | static void srt_alignment_cb(void *priv, int alignment) |
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185 | { |
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186 | SRTContext *s = priv; |
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187 | if (!s->alignment_applied && alignment >= 0) { |
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188 | srt_print(s, "{\\an%d}", alignment); |
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189 | s->alignment_applied = 1; |
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190 | } |
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191 | } |
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192 | |||
193 | static void srt_cancel_overrides_cb(void *priv, const char *style) |
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194 | { |
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195 | srt_stack_push_pop(priv, 0, 1); |
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196 | srt_style_apply(priv, style); |
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197 | } |
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198 | |||
199 | static void srt_move_cb(void *priv, int x1, int y1, int x2, int y2, |
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200 | int t1, int t2) |
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201 | { |
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202 | // TODO: add a AV_PKT_DATA_SUBTITLE_POSITION side data when a new subtitles |
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203 | // encoding API passing the AVPacket is available. |
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204 | } |
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205 | |||
206 | static void srt_end_cb(void *priv) |
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207 | { |
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208 | srt_stack_push_pop(priv, 0, 1); |
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209 | } |
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210 | |||
211 | static const ASSCodesCallbacks srt_callbacks = { |
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212 | .text = srt_text_cb, |
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213 | .new_line = srt_new_line_cb, |
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214 | .style = srt_style_cb, |
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215 | .color = srt_color_cb, |
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216 | .font_name = srt_font_name_cb, |
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217 | .font_size = srt_font_size_cb, |
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218 | .alignment = srt_alignment_cb, |
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219 | .cancel_overrides = srt_cancel_overrides_cb, |
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220 | .move = srt_move_cb, |
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221 | .end = srt_end_cb, |
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222 | }; |
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223 | |||
224 | static int srt_encode_frame(AVCodecContext *avctx, |
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225 | unsigned char *buf, int bufsize, const AVSubtitle *sub) |
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226 | { |
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227 | SRTContext *s = avctx->priv_data; |
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228 | ASSDialog *dialog; |
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229 | int i, num; |
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230 | |||
231 | av_bprint_clear(&s->buffer); |
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232 | |||
233 | for (i=0; i |
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234 | |||
235 | if (sub->rects[i]->type != SUBTITLE_ASS) { |
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236 | av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); |
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237 | return AVERROR(ENOSYS); |
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238 | } |
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239 | |||
240 | dialog = ff_ass_split_dialog(s->ass_ctx, sub->rects[i]->ass, 0, &num); |
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241 | for (; dialog && num--; dialog++) { |
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242 | s->alignment_applied = 0; |
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243 | srt_style_apply(s, dialog->style); |
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244 | ff_ass_split_override_codes(&srt_callbacks, s, dialog->text); |
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245 | } |
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246 | } |
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247 | |||
248 | if (!av_bprint_is_complete(&s->buffer)) |
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249 | return AVERROR(ENOMEM); |
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250 | if (!s->buffer.len) |
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251 | return 0; |
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252 | |||
253 | if (s->buffer.len > bufsize) { |
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254 | av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); |
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255 | return -1; |
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256 | } |
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257 | memcpy(buf, s->buffer.str, s->buffer.len); |
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258 | |||
259 | return s->buffer.len; |
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260 | } |
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261 | |||
262 | static int srt_encode_close(AVCodecContext *avctx) |
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263 | { |
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264 | SRTContext *s = avctx->priv_data; |
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265 | ff_ass_split_free(s->ass_ctx); |
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266 | av_bprint_finalize(&s->buffer, NULL); |
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267 | return 0; |
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268 | } |
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269 | |||
270 | #if CONFIG_SRT_ENCODER |
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271 | /* deprecated encoder */ |
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272 | AVCodec ff_srt_encoder = { |
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273 | .name = "srt", |
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274 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
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275 | .type = AVMEDIA_TYPE_SUBTITLE, |
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276 | .id = AV_CODEC_ID_SUBRIP, |
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277 | .priv_data_size = sizeof(SRTContext), |
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278 | .init = srt_encode_init, |
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279 | .encode_sub = srt_encode_frame, |
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280 | .close = srt_encode_close, |
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281 | }; |
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282 | #endif |
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283 | |||
284 | #if CONFIG_SUBRIP_ENCODER |
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285 | AVCodec ff_subrip_encoder = { |
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286 | .name = "subrip", |
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287 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
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288 | .type = AVMEDIA_TYPE_SUBTITLE, |
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289 | .id = AV_CODEC_ID_SUBRIP, |
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290 | .priv_data_size = sizeof(SRTContext), |
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291 | .init = srt_encode_init, |
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292 | .encode_sub = srt_encode_frame, |
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293 | .close = srt_encode_close, |
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294 | }; |
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295 | #endif>><>%c>><> |