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00022 #include "libavutil/avstring.h"
00023 #include "libavutil/common.h"
00024 #include "libavutil/parseutils.h"
00025 #include "avcodec.h"
00026 #include "ass.h"
00027
00028 static int html_color_parse(AVCodecContext *avctx, const char *str)
00029 {
00030 uint8_t rgba[4];
00031 if (av_parse_color(rgba, str, strcspn(str, "\" >"), avctx) < 0)
00032 return -1;
00033 return rgba[0] | rgba[1] << 8 | rgba[2] << 16;
00034 }
00035
00036 enum {
00037 PARAM_UNKNOWN = -1,
00038 PARAM_SIZE,
00039 PARAM_COLOR,
00040 PARAM_FACE,
00041 PARAM_NUMBER
00042 };
00043
00044 typedef struct {
00045 char tag[128];
00046 char param[PARAM_NUMBER][128];
00047 } SrtStack;
00048
00049 static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
00050 const char *in, int x1, int y1, int x2, int y2)
00051 {
00052 char c, *param, buffer[128], tmp[128];
00053 int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
00054 SrtStack stack[16];
00055
00056 stack[0].tag[0] = 0;
00057 strcpy(stack[0].param[PARAM_SIZE], "{\\fs}");
00058 strcpy(stack[0].param[PARAM_COLOR], "{\\c}");
00059 strcpy(stack[0].param[PARAM_FACE], "{\\fn}");
00060
00061 if (x1 >= 0 && y1 >= 0) {
00062 if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1))
00063 snprintf(out, out_end-out,
00064 "{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2);
00065 else
00066 snprintf(out, out_end-out, "{\\an1}{\\pos(%d,%d)}", x1, y1);
00067 out += strlen(out);
00068 }
00069
00070 for (; out < out_end && !end && *in; in++) {
00071 switch (*in) {
00072 case '\r':
00073 break;
00074 case '\n':
00075 if (line_start) {
00076 end = 1;
00077 break;
00078 }
00079 while (out[-1] == ' ')
00080 out--;
00081 snprintf(out, out_end-out, "\\N");
00082 if(out<out_end) out += strlen(out);
00083 line_start = 1;
00084 break;
00085 case ' ':
00086 if (!line_start)
00087 *out++ = *in;
00088 break;
00089 case '{':
00090
00091 an += sscanf(in, "{\\an%*1u}%c", &c) == 1;
00092 if ((an != 1 && sscanf(in, "{\\%*[^}]}%n%c", &len, &c) > 0) ||
00093 sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n%c", &len, &c) > 0) {
00094 in += len - 1;
00095 } else
00096 *out++ = *in;
00097 break;
00098 case '<':
00099 tag_close = in[1] == '/';
00100 if (sscanf(in+tag_close+1, "%127[^>]>%n%c", buffer, &len,&c) >= 2) {
00101 if ((param = strchr(buffer, ' ')))
00102 *param++ = 0;
00103 if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
00104 ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) {
00105 int i, j, unknown = 0;
00106 in += len + tag_close;
00107 if (!tag_close)
00108 memset(stack+sptr, 0, sizeof(*stack));
00109 if (!strcmp(buffer, "font")) {
00110 if (tag_close) {
00111 for (i=PARAM_NUMBER-1; i>=0; i--)
00112 if (stack[sptr-1].param[i][0])
00113 for (j=sptr-2; j>=0; j--)
00114 if (stack[j].param[i][0]) {
00115 snprintf(out, out_end-out,
00116 "%s", stack[j].param[i]);
00117 if(out<out_end) out += strlen(out);
00118 break;
00119 }
00120 } else {
00121 while (param) {
00122 if (!strncmp(param, "size=", 5)) {
00123 unsigned font_size;
00124 param += 5 + (param[5] == '"');
00125 if (sscanf(param, "%u", &font_size) == 1) {
00126 snprintf(stack[sptr].param[PARAM_SIZE],
00127 sizeof(stack[0].param[PARAM_SIZE]),
00128 "{\\fs%u}", font_size);
00129 }
00130 } else if (!strncmp(param, "color=", 6)) {
00131 param += 6 + (param[6] == '"');
00132 snprintf(stack[sptr].param[PARAM_COLOR],
00133 sizeof(stack[0].param[PARAM_COLOR]),
00134 "{\\c&H%X&}",
00135 html_color_parse(avctx, param));
00136 } else if (!strncmp(param, "face=", 5)) {
00137 param += 5 + (param[5] == '"');
00138 len = strcspn(param,
00139 param[-1] == '"' ? "\"" :" ");
00140 av_strlcpy(tmp, param,
00141 FFMIN(sizeof(tmp), len+1));
00142 param += len;
00143 snprintf(stack[sptr].param[PARAM_FACE],
00144 sizeof(stack[0].param[PARAM_FACE]),
00145 "{\\fn%s}", tmp);
00146 }
00147 if ((param = strchr(param, ' ')))
00148 param++;
00149 }
00150 for (i=0; i<PARAM_NUMBER; i++)
00151 if (stack[sptr].param[i][0]) {
00152 snprintf(out, out_end-out,
00153 "%s", stack[sptr].param[i]);
00154 if(out<out_end) out += strlen(out);
00155 }
00156 }
00157 } else if (!buffer[1] && strspn(buffer, "bisu") == 1) {
00158 snprintf(out, out_end-out,
00159 "{\\%c%d}", buffer[0], !tag_close);
00160 if(out<out_end) out += strlen(out);
00161 } else {
00162 unknown = 1;
00163 snprintf(tmp, sizeof(tmp), "</%s>", buffer);
00164 }
00165 if (tag_close) {
00166 sptr--;
00167 } else if (unknown && !strstr(in, tmp)) {
00168 in -= len + tag_close;
00169 *out++ = *in;
00170 } else
00171 av_strlcpy(stack[sptr++].tag, buffer,
00172 sizeof(stack[0].tag));
00173 break;
00174 }
00175 }
00176 default:
00177 *out++ = *in;
00178 break;
00179 }
00180 if (*in != ' ' && *in != '\r' && *in != '\n')
00181 line_start = 0;
00182 }
00183
00184 out = FFMIN(out, out_end-3);
00185 while (!strncmp(out-2, "\\N", 2))
00186 out -= 2;
00187 while (out[-1] == ' ')
00188 out--;
00189 snprintf(out, out_end-out, "\r\n");
00190 return in;
00191 }
00192
00193 static const char *read_ts(const char *buf, int *ts_start, int *ts_end,
00194 int *x1, int *y1, int *x2, int *y2)
00195 {
00196 int i, hs, ms, ss, he, me, se;
00197
00198 for (i=0; i<2; i++) {
00199
00200 int c = sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
00201 "%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
00202 &hs, &ms, &ss, ts_start, &he, &me, &se, ts_end,
00203 x1, x2, y1, y2);
00204 buf += strcspn(buf, "\n") + 1;
00205 if (c >= 8) {
00206 *ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10;
00207 *ts_end = 100*(se + 60*(me + 60*he)) + *ts_end /10;
00208 return buf;
00209 }
00210 }
00211 return NULL;
00212 }
00213
00214 static int srt_decode_frame(AVCodecContext *avctx,
00215 void *data, int *got_sub_ptr, AVPacket *avpkt)
00216 {
00217 AVSubtitle *sub = data;
00218 int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
00219 char buffer[2048];
00220 const char *ptr = avpkt->data;
00221 const char *end = avpkt->data + avpkt->size;
00222
00223 if (avpkt->size <= 0)
00224 return avpkt->size;
00225
00226 while (ptr < end && *ptr) {
00227 if (avctx->codec->id == CODEC_ID_SRT) {
00228 ptr = read_ts(ptr, &ts_start, &ts_end, &x1, &y1, &x2, &y2);
00229 if (!ptr)
00230 break;
00231 } else {
00232
00233 ts_start = av_rescale_q(avpkt->pts,
00234 avctx->time_base,
00235 (AVRational){1,100});
00236 ts_end = av_rescale_q(avpkt->pts + avpkt->duration,
00237 avctx->time_base,
00238 (AVRational){1,100});
00239 }
00240 ptr = srt_to_ass(avctx, buffer, buffer+sizeof(buffer), ptr,
00241 x1, y1, x2, y2);
00242 ff_ass_add_rect(sub, buffer, ts_start, ts_end-ts_start, 0);
00243 }
00244
00245 *got_sub_ptr = sub->num_rects > 0;
00246 return avpkt->size;
00247 }
00248
00249 #if CONFIG_SRT_DECODER
00250 AVCodec ff_srt_decoder = {
00251 .name = "srt",
00252 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle with embedded timing"),
00253 .type = AVMEDIA_TYPE_SUBTITLE,
00254 .id = AV_CODEC_ID_SRT,
00255 .init = ff_ass_subtitle_header_default,
00256 .decode = srt_decode_frame,
00257 };
00258 #endif
00259
00260 #if CONFIG_SUBRIP_DECODER
00261 AVCodec ff_subrip_decoder = {
00262 .name = "subrip",
00263 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
00264 .type = AVMEDIA_TYPE_SUBTITLE,
00265 .id = AV_CODEC_ID_SUBRIP,
00266 .init = ff_ass_subtitle_header_default,
00267 .decode = srt_decode_frame,
00268 };
00269 #endif
