| /* |
| * SubRip subtitle decoder |
| * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/avstring.h" |
| #include "libavutil/common.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/parseutils.h" |
| #include "avcodec.h" |
| #include "ass.h" |
| |
| static int html_color_parse(AVCodecContext *avctx, const char *str) |
| { |
| uint8_t rgba[4]; |
| if (av_parse_color(rgba, str, strcspn(str, "\" >"), avctx) < 0) |
| return -1; |
| return rgba[0] | rgba[1] << 8 | rgba[2] << 16; |
| } |
| |
| enum { |
| PARAM_UNKNOWN = -1, |
| PARAM_SIZE, |
| PARAM_COLOR, |
| PARAM_FACE, |
| PARAM_NUMBER |
| }; |
| |
| typedef struct SrtStack { |
| char tag[128]; |
| char param[PARAM_NUMBER][128]; |
| } SrtStack; |
| |
| static void rstrip_spaces_buf(AVBPrint *buf) |
| { |
| while (buf->len > 0 && buf->str[buf->len - 1] == ' ') |
| buf->str[--buf->len] = 0; |
| } |
| |
| static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst, |
| const char *in, int x1, int y1, int x2, int y2) |
| { |
| char *param, buffer[128], tmp[128]; |
| int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0; |
| SrtStack stack[16]; |
| |
| stack[0].tag[0] = 0; |
| strcpy(stack[0].param[PARAM_SIZE], "{\\fs}"); |
| strcpy(stack[0].param[PARAM_COLOR], "{\\c}"); |
| strcpy(stack[0].param[PARAM_FACE], "{\\fn}"); |
| |
| if (x1 >= 0 && y1 >= 0) { |
| /* XXX: here we rescale coordinate assuming they are in DVD resolution |
| * (720x480) since we don't have anything better */ |
| |
| if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1) && x2 >= x1 && y2 >= y1) { |
| /* text rectangle defined, write the text at the center of the rectangle */ |
| const int cx = x1 + (x2 - x1)/2; |
| const int cy = y1 + (y2 - y1)/2; |
| const int scaled_x = cx * ASS_DEFAULT_PLAYRESX / 720; |
| const int scaled_y = cy * ASS_DEFAULT_PLAYRESY / 480; |
| av_bprintf(dst, "{\\an5}{\\pos(%d,%d)}", scaled_x, scaled_y); |
| } else { |
| /* only the top left corner, assume the text starts in that corner */ |
| const int scaled_x = x1 * ASS_DEFAULT_PLAYRESX / 720; |
| const int scaled_y = y1 * ASS_DEFAULT_PLAYRESY / 480; |
| av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y); |
| } |
| } |
| |
| for (; !end && *in; in++) { |
| switch (*in) { |
| case '\r': |
| break; |
| case '\n': |
| if (line_start) { |
| end = 1; |
| break; |
| } |
| rstrip_spaces_buf(dst); |
| av_bprintf(dst, "\\N"); |
| line_start = 1; |
| break; |
| case ' ': |
| if (!line_start) |
| av_bprint_chars(dst, *in, 1); |
| break; |
| case '{': /* skip all {\xxx} substrings except for {\an%d} |
| and all microdvd like styles such as {Y:xxx} */ |
| len = 0; |
| an += sscanf(in, "{\\an%*1u}%n", &len) >= 0 && len > 0; |
| if ((an != 1 && (len = 0, sscanf(in, "{\\%*[^}]}%n", &len) >= 0 && len > 0)) || |
| (len = 0, sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n", &len) >= 0 && len > 0)) { |
| in += len - 1; |
| } else |
| av_bprint_chars(dst, *in, 1); |
| break; |
| case '<': |
| tag_close = in[1] == '/'; |
| len = 0; |
| if (sscanf(in+tag_close+1, "%127[^>]>%n", buffer, &len) >= 1 && len > 0) { |
| if ((param = strchr(buffer, ' '))) |
| *param++ = 0; |
| if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) || |
| ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) { |
| int i, j, unknown = 0; |
| in += len + tag_close; |
| if (!tag_close) |
| memset(stack+sptr, 0, sizeof(*stack)); |
| if (!strcmp(buffer, "font")) { |
| if (tag_close) { |
| for (i=PARAM_NUMBER-1; i>=0; i--) |
| if (stack[sptr-1].param[i][0]) |
| for (j=sptr-2; j>=0; j--) |
| if (stack[j].param[i][0]) { |
| av_bprintf(dst, "%s", stack[j].param[i]); |
| break; |
| } |
| } else { |
| while (param) { |
| if (!strncmp(param, "size=", 5)) { |
| unsigned font_size; |
| param += 5 + (param[5] == '"'); |
| if (sscanf(param, "%u", &font_size) == 1) { |
| snprintf(stack[sptr].param[PARAM_SIZE], |
| sizeof(stack[0].param[PARAM_SIZE]), |
| "{\\fs%u}", font_size); |
| } |
| } else if (!strncmp(param, "color=", 6)) { |
| param += 6 + (param[6] == '"'); |
| snprintf(stack[sptr].param[PARAM_COLOR], |
| sizeof(stack[0].param[PARAM_COLOR]), |
| "{\\c&H%X&}", |
| html_color_parse(avctx, param)); |
| } else if (!strncmp(param, "face=", 5)) { |
| param += 5 + (param[5] == '"'); |
| len = strcspn(param, |
| param[-1] == '"' ? "\"" :" "); |
| av_strlcpy(tmp, param, |
| FFMIN(sizeof(tmp), len+1)); |
| param += len; |
| snprintf(stack[sptr].param[PARAM_FACE], |
| sizeof(stack[0].param[PARAM_FACE]), |
| "{\\fn%s}", tmp); |
| } |
| if ((param = strchr(param, ' '))) |
| param++; |
| } |
| for (i=0; i<PARAM_NUMBER; i++) |
| if (stack[sptr].param[i][0]) |
| av_bprintf(dst, "%s", stack[sptr].param[i]); |
| } |
| } else if (!buffer[1] && strspn(buffer, "bisu") == 1) { |
| av_bprintf(dst, "{\\%c%d}", buffer[0], !tag_close); |
| } else { |
| unknown = 1; |
| snprintf(tmp, sizeof(tmp), "</%s>", buffer); |
| } |
| if (tag_close) { |
| sptr--; |
| } else if (unknown && !strstr(in, tmp)) { |
| in -= len + tag_close; |
| av_bprint_chars(dst, *in, 1); |
| } else |
| av_strlcpy(stack[sptr++].tag, buffer, |
| sizeof(stack[0].tag)); |
| break; |
| } |
| } |
| default: |
| av_bprint_chars(dst, *in, 1); |
| break; |
| } |
| if (*in != ' ' && *in != '\r' && *in != '\n') |
| line_start = 0; |
| } |
| |
| while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2)) |
| dst->len -= 2; |
| dst->str[dst->len] = 0; |
| rstrip_spaces_buf(dst); |
| } |
| |
| static int srt_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_sub_ptr, AVPacket *avpkt) |
| { |
| AVSubtitle *sub = data; |
| AVBPrint buffer; |
| int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
| int size, ret; |
| const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size); |
| |
| if (p && size == 16) { |
| x1 = AV_RL32(p ); |
| y1 = AV_RL32(p + 4); |
| x2 = AV_RL32(p + 8); |
| y2 = AV_RL32(p + 12); |
| } |
| |
| if (avpkt->size <= 0) |
| return avpkt->size; |
| |
| av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED); |
| |
| // TODO: reindent |
| // Do final divide-by-10 outside rescale to force rounding down. |
| ts_start = av_rescale_q(avpkt->pts, |
| avctx->time_base, |
| (AVRational){1,100}); |
| ts_end = av_rescale_q(avpkt->pts + avpkt->duration, |
| avctx->time_base, |
| (AVRational){1,100}); |
| |
| srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2); |
| ret = ff_ass_add_rect_bprint(sub, &buffer, ts_start, ts_end-ts_start); |
| av_bprint_finalize(&buffer, NULL); |
| if (ret < 0) |
| return ret; |
| |
| *got_sub_ptr = sub->num_rects > 0; |
| return avpkt->size; |
| } |
| |
| #if CONFIG_SRT_DECODER |
| /* deprecated decoder */ |
| AVCodec ff_srt_decoder = { |
| .name = "srt", |
| .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_SUBRIP, |
| .init = ff_ass_subtitle_header_default, |
| .decode = srt_decode_frame, |
| }; |
| #endif |
| |
| #if CONFIG_SUBRIP_DECODER |
| AVCodec ff_subrip_decoder = { |
| .name = "subrip", |
| .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_SUBRIP, |
| .init = ff_ass_subtitle_header_default, |
| .decode = srt_decode_frame, |
| }; |
| #endif |
