mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 26119 to svn://svn.ffmpeg.org/ffmpeg/trunkoldabi
Aurelien Jacobs
14 years ago
parent
312056c54e
commit
2c77c90684
11 changed files with 335 additions and 3 deletions
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/*
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* SubRip subtitle decoder |
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/avstring.h" |
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#include "libavcore/parseutils.h" |
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#include "avcodec.h" |
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#include "ass.h" |
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static int html_color_parse(AVCodecContext *avctx, const char *str) |
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{ |
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uint8_t rgba[4]; |
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if (av_parse_color(rgba, str, strcspn(str, "\" >"), avctx) < 0) |
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return -1; |
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return rgba[0] | rgba[1] << 8 | rgba[2] << 16; |
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} |
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enum { |
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PARAM_UNKNOWN = -1, |
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PARAM_SIZE, |
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PARAM_COLOR, |
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PARAM_FACE, |
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PARAM_NUMBER |
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}; |
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typedef struct { |
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char tag[128]; |
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char param[PARAM_NUMBER][128]; |
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} SrtStack; |
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static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end, |
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const char *in, int x1, int y1, int x2, int y2) |
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{ |
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char c, *param, buffer[128], tmp[128]; |
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int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0; |
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SrtStack stack[16]; |
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stack[0].tag[0] = 0; |
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strcpy(stack[0].param[PARAM_SIZE], "{\\fs}"); |
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strcpy(stack[0].param[PARAM_COLOR], "{\\c}"); |
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strcpy(stack[0].param[PARAM_FACE], "{\\fn}"); |
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if (x1 >= 0 && y1 >= 0) { |
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if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1)) |
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out += snprintf(out, out_end-out, |
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"{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2); |
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else |
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out += snprintf(out, out_end-out, "{\\an1}{\\pos(%d,%d)}", x1, y1); |
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} |
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for (; *in && out < out_end && !end; in++) { |
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switch (*in) { |
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case '\r': |
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break; |
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case '\n': |
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if (line_start) { |
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end = 1; |
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break; |
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} |
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while (out[-1] == ' ') |
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out--; |
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out += snprintf(out, out_end-out, "\\N"); |
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line_start = 1; |
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break; |
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case ' ': |
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if (!line_start) |
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*out++ = *in; |
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break; |
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case '{': /* skip all {\xxx} substrings except for {\an%d}
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and all microdvd like styles such as {Y:xxx} */ |
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an += sscanf(in, "{\\an%*1u}%c", &c) == 1; |
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if ((an != 1 && sscanf(in, "{\\%*[^}]}%n%c", &len, &c) > 0) || |
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sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n%c", &len, &c) > 0) { |
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in += len - 1; |
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} else |
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*out++ = *in; |
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break; |
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case '<': |
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tag_close = in[1] == '/'; |
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if (sscanf(in+tag_close+1, "%128[^>]>%n%c", buffer, &len,&c) >= 2) { |
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if ((param = strchr(buffer, ' '))) |
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*param++ = 0; |
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if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) || |
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( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) { |
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int i, j, unknown = 0; |
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in += len + tag_close; |
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if (!tag_close) |
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memset(stack+sptr, 0, sizeof(*stack)); |
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if (!strcmp(buffer, "font")) { |
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if (tag_close) { |
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for (i=PARAM_NUMBER-1; i>=0; i--) |
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if (stack[sptr-1].param[i][0]) |
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for (j=sptr-2; j>=0; j--) |
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if (stack[j].param[i][0]) { |
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out += snprintf(out, out_end-out, |
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stack[j].param[i]); |
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break; |
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} |
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} else { |
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while (param) { |
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if (!strncmp(param, "size=", 5)) { |
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unsigned font_size; |
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param += 5 + (param[5] == '"'); |
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if (sscanf(param, "%u", &font_size) == 1) { |
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snprintf(stack[sptr].param[PARAM_SIZE], |
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sizeof(stack[0].param[PARAM_SIZE]), |
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"{\\fs%u}", font_size); |
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} |
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} else if (!strncmp(param, "color=", 6)) { |
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param += 6 + (param[6] == '"'); |
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snprintf(stack[sptr].param[PARAM_COLOR], |
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sizeof(stack[0].param[PARAM_COLOR]), |
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"{\\c&H%X&}", |
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html_color_parse(avctx, param)); |
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} else if (!strncmp(param, "face=", 5)) { |
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param += 5 + (param[5] == '"'); |
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len = strcspn(param, |
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param[-1] == '"' ? "\"" :" "); |
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av_strlcpy(tmp, param, |
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FFMIN(sizeof(tmp), len+1)); |
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param += len; |
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snprintf(stack[sptr].param[PARAM_FACE], |
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sizeof(stack[0].param[PARAM_FACE]), |
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"{\\fn%s}", tmp); |
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} |
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if ((param = strchr(param, ' '))) |
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param++; |
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} |
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for (i=0; i<PARAM_NUMBER; i++) |
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if (stack[sptr].param[i][0]) |
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out += snprintf(out, out_end-out, |
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stack[sptr].param[i]); |
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} |
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} else if (!buffer[1] && strspn(buffer, "bisu") == 1) { |
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out += snprintf(out, out_end-out, |
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"{\\%c%d}", buffer[0], !tag_close); |
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} else { |
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unknown = 1; |
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snprintf(tmp, sizeof(tmp), "</%s>", buffer); |
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} |
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if (tag_close) { |
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sptr--; |
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} else if (unknown && !strstr(in, tmp)) { |
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in -= len + tag_close; |
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*out++ = *in; |
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} else |
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av_strlcpy(stack[sptr++].tag, buffer, |
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sizeof(stack[0].tag)); |
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break; |
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} |
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} |
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default: |
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*out++ = *in; |
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break; |
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} |
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if (*in != ' ' && *in != '\r' && *in != '\n') |
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line_start = 0; |
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} |
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out = FFMIN(out, out_end-3); |
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while (!strncmp(out-2, "\\N", 2)) |
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out -= 2; |
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while (out[-1] == ' ') |
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out--; |
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out += snprintf(out, out_end-out, "\r\n"); |
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return in; |
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} |
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static const char *read_ts(const char *buf, int *ts_start, int *ts_end, |
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int *x1, int *y1, int *x2, int *y2) |
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{ |
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int i, hs, ms, ss, he, me, se; |
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for (i=0; i<2; i++) { |
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/* try to read timestamps in either the first or second line */ |
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int c = sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d" |
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"%*[ ]X1:%u X2:%u Y1:%u Y2:%u", |
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&hs, &ms, &ss, ts_start, &he, &me, &se, ts_end, |
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x1, x2, y1, y2); |
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buf += strcspn(buf, "\n") + 1; |
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if (c >= 8) { |
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*ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10; |
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*ts_end = 100*(se + 60*(me + 60*he)) + *ts_end /10; |
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return buf; |
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} |
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} |
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return NULL; |
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} |
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static int srt_decode_frame(AVCodecContext *avctx, |
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void *data, int *got_sub_ptr, AVPacket *avpkt) |
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{ |
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AVSubtitle *sub = data; |
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int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
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char buffer[2048]; |
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const char *ptr = avpkt->data; |
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if (avpkt->size <= 0) |
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return avpkt->size; |
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ff_ass_init(sub); |
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while (*ptr) { |
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ptr = read_ts(ptr, &ts_start, &ts_end, &x1, &y1, &x2, &y2); |
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if (!ptr) |
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break; |
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ptr = srt_to_ass(avctx, buffer, buffer+sizeof(buffer), ptr, |
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x1, y1, x2, y2); |
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ff_ass_add_rect(sub, buffer, ts_start, ts_end, 0); |
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} |
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*got_sub_ptr = sub->num_rects > 0; |
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return avpkt->size; |
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} |
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AVCodec srt_decoder = { |
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.name = "srt", |
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.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
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.type = AVMEDIA_TYPE_SUBTITLE, |
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.id = CODEC_ID_SRT, |
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.init = ff_ass_subtitle_header_default, |
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.decode = srt_decode_frame, |
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}; |
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@ -0,0 +1 @@ |
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03b2a3f7e7e83624c8e4d1b5569df758 |
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