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| 1 | +/* |
| 2 | + * SubRip subtitle decoder |
| 3 | + * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| 4 | + * |
| 5 | + * This file is part of FFmpeg. |
| 6 | + * |
| 7 | + * FFmpeg is free software; you can redistribute it and/or |
| 8 | + * modify it under the terms of the GNU Lesser General Public |
| 9 | + * License as published by the Free Software Foundation; either |
| 10 | + * version 2.1 of the License, or (at your option) any later version. |
| 11 | + * |
| 12 | + * FFmpeg is distributed in the hope that it will be useful, |
| 13 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | + * Lesser General Public License for more details. |
| 16 | + * |
| 17 | + * You should have received a copy of the GNU Lesser General Public |
| 18 | + * License along with FFmpeg; if not, write to the Free Software |
| 19 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | + */ |
| 21 | + |
| 22 | +#include "libavutil/avstring.h" |
| 23 | +#include "libavcore/parseutils.h" |
| 24 | +#include "avcodec.h" |
| 25 | +#include "ass.h" |
| 26 | + |
| 27 | +static int html_color_parse(AVCodecContext *avctx, const char *str) |
| 28 | +{ |
| 29 | + uint8_t rgba[4]; |
| 30 | + if (av_parse_color(rgba, str, strcspn(str, "\" >"), avctx) < 0) |
| 31 | + return -1; |
| 32 | + return rgba[0] | rgba[1] << 8 | rgba[2] << 16; |
| 33 | +} |
| 34 | + |
| 35 | +enum { |
| 36 | + PARAM_UNKNOWN = -1, |
| 37 | + PARAM_SIZE, |
| 38 | + PARAM_COLOR, |
| 39 | + PARAM_FACE, |
| 40 | + PARAM_NUMBER |
| 41 | +}; |
| 42 | + |
| 43 | +typedef struct { |
| 44 | + char tag[128]; |
| 45 | + char param[PARAM_NUMBER][128]; |
| 46 | +} SrtStack; |
| 47 | + |
| 48 | +static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end, |
| 49 | + const char *in, int x1, int y1, int x2, int y2) |
| 50 | +{ |
| 51 | + char c, *param, buffer[128], tmp[128]; |
| 52 | + int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0; |
| 53 | + SrtStack stack[16]; |
| 54 | + |
| 55 | + stack[0].tag[0] = 0; |
| 56 | + strcpy(stack[0].param[PARAM_SIZE], "{\\fs}"); |
| 57 | + strcpy(stack[0].param[PARAM_COLOR], "{\\c}"); |
| 58 | + strcpy(stack[0].param[PARAM_FACE], "{\\fn}"); |
| 59 | + |
| 60 | + if (x1 >= 0 && y1 >= 0) { |
| 61 | + if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1)) |
| 62 | + out += snprintf(out, out_end-out, |
| 63 | + "{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2); |
| 64 | + else |
| 65 | + out += snprintf(out, out_end-out, "{\\an1}{\\pos(%d,%d)}", x1, y1); |
| 66 | + } |
| 67 | + |
| 68 | + for (; *in && out < out_end && !end; in++) { |
| 69 | + switch (*in) { |
| 70 | + case '\r': |
| 71 | + break; |
| 72 | + case '\n': |
| 73 | + if (line_start) { |
| 74 | + end = 1; |
| 75 | + break; |
| 76 | + } |
| 77 | + while (out[-1] == ' ') |
| 78 | + out--; |
| 79 | + out += snprintf(out, out_end-out, "\\N"); |
| 80 | + line_start = 1; |
| 81 | + break; |
| 82 | + case ' ': |
| 83 | + if (!line_start) |
| 84 | + *out++ = *in; |
| 85 | + break; |
| 86 | + case '{': /* skip all {\xxx} substrings except for {\an%d} |
| 87 | + and all microdvd like styles such as {Y:xxx} */ |
| 88 | + an += sscanf(in, "{\\an%*1u}%c", &c) == 1; |
| 89 | + if ((an != 1 && sscanf(in, "{\\%*[^}]}%n%c", &len, &c) > 0) || |
| 90 | + sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n%c", &len, &c) > 0) { |
| 91 | + in += len - 1; |
| 92 | + } else |
| 93 | + *out++ = *in; |
| 94 | + break; |
| 95 | + case '<': |
| 96 | + tag_close = in[1] == '/'; |
| 97 | + if (sscanf(in+tag_close+1, "%128[^>]>%n%c", buffer, &len,&c) >= 2) { |
| 98 | + if ((param = strchr(buffer, ' '))) |
| 99 | + *param++ = 0; |
| 100 | + if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) || |
| 101 | + ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) { |
| 102 | + int i, j, unknown = 0; |
| 103 | + in += len + tag_close; |
| 104 | + if (!tag_close) |
| 105 | + memset(stack+sptr, 0, sizeof(*stack)); |
| 106 | + if (!strcmp(buffer, "font")) { |
| 107 | + if (tag_close) { |
| 108 | + for (i=PARAM_NUMBER-1; i>=0; i--) |
| 109 | + if (stack[sptr-1].param[i][0]) |
| 110 | + for (j=sptr-2; j>=0; j--) |
| 111 | + if (stack[j].param[i][0]) { |
| 112 | + out += snprintf(out, out_end-out, |
| 113 | + stack[j].param[i]); |
| 114 | + break; |
| 115 | + } |
| 116 | + } else { |
| 117 | + while (param) { |
| 118 | + if (!strncmp(param, "size=", 5)) { |
| 119 | + unsigned font_size; |
| 120 | + param += 5 + (param[5] == '"'); |
| 121 | + if (sscanf(param, "%u", &font_size) == 1) { |
| 122 | + snprintf(stack[sptr].param[PARAM_SIZE], |
| 123 | + sizeof(stack[0].param[PARAM_SIZE]), |
| 124 | + "{\\fs%u}", font_size); |
| 125 | + } |
| 126 | + } else if (!strncmp(param, "color=", 6)) { |
| 127 | + param += 6 + (param[6] == '"'); |
| 128 | + snprintf(stack[sptr].param[PARAM_COLOR], |
| 129 | + sizeof(stack[0].param[PARAM_COLOR]), |
| 130 | + "{\\c&H%X&}", |
| 131 | + html_color_parse(avctx, param)); |
| 132 | + } else if (!strncmp(param, "face=", 5)) { |
| 133 | + param += 5 + (param[5] == '"'); |
| 134 | + len = strcspn(param, |
| 135 | + param[-1] == '"' ? "\"" :" "); |
| 136 | + av_strlcpy(tmp, param, |
| 137 | + FFMIN(sizeof(tmp), len+1)); |
| 138 | + param += len; |
| 139 | + snprintf(stack[sptr].param[PARAM_FACE], |
| 140 | + sizeof(stack[0].param[PARAM_FACE]), |
| 141 | + "{\\fn%s}", tmp); |
| 142 | + } |
| 143 | + if ((param = strchr(param, ' '))) |
| 144 | + param++; |
| 145 | + } |
| 146 | + for (i=0; i<PARAM_NUMBER; i++) |
| 147 | + if (stack[sptr].param[i][0]) |
| 148 | + out += snprintf(out, out_end-out, |
| 149 | + stack[sptr].param[i]); |
| 150 | + } |
| 151 | + } else if (!buffer[1] && strspn(buffer, "bisu") == 1) { |
| 152 | + out += snprintf(out, out_end-out, |
| 153 | + "{\\%c%d}", buffer[0], !tag_close); |
| 154 | + } else { |
| 155 | + unknown = 1; |
| 156 | + snprintf(tmp, sizeof(tmp), "</%s>", buffer); |
| 157 | + } |
| 158 | + if (tag_close) { |
| 159 | + sptr--; |
| 160 | + } else if (unknown && !strstr(in, tmp)) { |
| 161 | + in -= len + tag_close; |
| 162 | + *out++ = *in; |
| 163 | + } else |
| 164 | + av_strlcpy(stack[sptr++].tag, buffer, |
| 165 | + sizeof(stack[0].tag)); |
| 166 | + break; |
| 167 | + } |
| 168 | + } |
| 169 | + default: |
| 170 | + *out++ = *in; |
| 171 | + break; |
| 172 | + } |
| 173 | + if (*in != ' ' && *in != '\r' && *in != '\n') |
| 174 | + line_start = 0; |
| 175 | + } |
| 176 | + |
| 177 | + out = FFMIN(out, out_end-3); |
| 178 | + while (!strncmp(out-2, "\\N", 2)) |
| 179 | + out -= 2; |
| 180 | + while (out[-1] == ' ') |
| 181 | + out--; |
| 182 | + out += snprintf(out, out_end-out, "\r\n"); |
| 183 | + return in; |
| 184 | +} |
| 185 | + |
| 186 | +static const char *read_ts(const char *buf, int *ts_start, int *ts_end, |
| 187 | + int *x1, int *y1, int *x2, int *y2) |
| 188 | +{ |
| 189 | + int i, hs, ms, ss, he, me, se; |
| 190 | + |
| 191 | + for (i=0; i<2; i++) { |
| 192 | + /* try to read timestamps in either the first or second line */ |
| 193 | + int c = sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d" |
| 194 | + "%*[ ]X1:%u X2:%u Y1:%u Y2:%u", |
| 195 | + &hs, &ms, &ss, ts_start, &he, &me, &se, ts_end, |
| 196 | + x1, x2, y1, y2); |
| 197 | + buf += strcspn(buf, "\n") + 1; |
| 198 | + if (c >= 8) { |
| 199 | + *ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10; |
| 200 | + *ts_end = 100*(se + 60*(me + 60*he)) + *ts_end /10; |
| 201 | + return buf; |
| 202 | + } |
| 203 | + } |
| 204 | + return NULL; |
| 205 | +} |
| 206 | + |
| 207 | +static int srt_decode_frame(AVCodecContext *avctx, |
| 208 | + void *data, int *got_sub_ptr, AVPacket *avpkt) |
| 209 | +{ |
| 210 | + AVSubtitle *sub = data; |
| 211 | + int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
| 212 | + char buffer[2048]; |
| 213 | + const char *ptr = avpkt->data; |
| 214 | + |
| 215 | + if (avpkt->size <= 0) |
| 216 | + return avpkt->size; |
| 217 | + |
| 218 | + ff_ass_init(sub); |
| 219 | + |
| 220 | + while (*ptr) { |
| 221 | + ptr = read_ts(ptr, &ts_start, &ts_end, &x1, &y1, &x2, &y2); |
| 222 | + if (!ptr) |
| 223 | + break; |
| 224 | + ptr = srt_to_ass(avctx, buffer, buffer+sizeof(buffer), ptr, |
| 225 | + x1, y1, x2, y2); |
| 226 | + ff_ass_add_rect(sub, buffer, ts_start, ts_end, 0); |
| 227 | + } |
| 228 | + |
| 229 | + *got_sub_ptr = sub->num_rects > 0; |
| 230 | + return avpkt->size; |
| 231 | +} |
| 232 | + |
| 233 | +AVCodec srt_decoder = { |
| 234 | + .name = "srt", |
| 235 | + .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
| 236 | + .type = AVMEDIA_TYPE_SUBTITLE, |
| 237 | + .id = CODEC_ID_SRT, |
| 238 | + .init = ff_ass_subtitle_header_default, |
| 239 | + .decode = srt_decode_frame, |
| 240 | +}; |