/* * Copyright (c) 2012 Clément Bœsch * * 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 */ /** * @file * SAMI subtitle decoder * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx */ #include "ass.h" #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "htmlsubtitles.h" typedef struct { AVBPrint source; AVBPrint content; AVBPrint encoded_source; AVBPrint encoded_content; AVBPrint full; } SAMIContext; static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src) { SAMIContext *sami = avctx->priv_data; int ret = 0; char *tag = NULL; char *dupsrc = av_strdup(src); char *p = dupsrc; AVBPrint *dst_content = &sami->encoded_content; AVBPrint *dst_source = &sami->encoded_source; av_bprint_clear(&sami->encoded_content); av_bprint_clear(&sami->content); av_bprint_clear(&sami->encoded_source); for (;;) { char *saveptr = NULL; int prev_chr_is_space = 0; AVBPrint *dst = &sami->content; /* parse & extract paragraph tag */ p = av_stristr(p, "<P"); if (!p) break; if (p[2] != '>' && !av_isspace(p[2])) { // avoid confusion with tags such as <PRE> p++; continue; } if (dst->len) // add a separator with the previous paragraph if there was one av_bprintf(dst, "\\N"); tag = av_strtok(p, ">", &saveptr); if (!tag || !saveptr) break; p = saveptr; /* check if the current paragraph is the "source" (speaker name) */ if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) { dst = &sami->source; av_bprint_clear(dst); } /* if empty event -> skip subtitle */ while (av_isspace(*p)) p++; if (!strncmp(p, " ", 6)) { ret = -1; goto end; } /* extract the text, stripping most of the tags */ while (*p) { if (*p == '<') { if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || av_isspace(p[2]))) break; } if (!av_strncasecmp(p, "<BR", 3)) { av_bprintf(dst, "\\N"); p++; while (*p && *p != '>') p++; if (!*p) break; if (*p == '>') p++; continue; } if (!av_isspace(*p)) av_bprint_chars(dst, *p, 1); else if (!prev_chr_is_space) av_bprint_chars(dst, ' ', 1); prev_chr_is_space = av_isspace(*p); p++; } } av_bprint_clear(&sami->full); if (sami->source.len) { ff_htmlmarkup_to_ass(avctx, dst_source, sami->source.str); av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->encoded_source.str); } ff_htmlmarkup_to_ass(avctx, dst_content, sami->content.str); av_bprintf(&sami->full, "%s", sami->encoded_content.str); end: av_free(dupsrc); return ret; } static int sami_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { AVSubtitle *sub = data; const char *ptr = avpkt->data; SAMIContext *sami = avctx->priv_data; if (ptr && avpkt->size > 0 && !sami_paragraph_to_ass(avctx, ptr)) { int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); int ts_duration = avpkt->duration != -1 ? av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1; int ret = ff_ass_add_rect_bprint(sub, &sami->full, ts_start, ts_duration); if (ret < 0) return ret; } *got_sub_ptr = sub->num_rects > 0; return avpkt->size; } static av_cold int sami_init(AVCodecContext *avctx) { SAMIContext *sami = avctx->priv_data; av_bprint_init(&sami->source, 0, 2048); av_bprint_init(&sami->content, 0, 2048); av_bprint_init(&sami->encoded_source, 0, 2048); av_bprint_init(&sami->encoded_content, 0, 2048); av_bprint_init(&sami->full, 0, 2048); return ff_ass_subtitle_header_default(avctx); } static av_cold int sami_close(AVCodecContext *avctx) { SAMIContext *sami = avctx->priv_data; av_bprint_finalize(&sami->source, NULL); av_bprint_finalize(&sami->content, NULL); av_bprint_finalize(&sami->encoded_source, NULL); av_bprint_finalize(&sami->encoded_content, NULL); av_bprint_finalize(&sami->full, NULL); return 0; } AVCodec ff_sami_decoder = { .name = "sami", .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle"), .type = AVMEDIA_TYPE_SUBTITLE, .id = AV_CODEC_ID_SAMI, .priv_data_size = sizeof(SAMIContext), .init = sami_init, .close = sami_close, .decode = sami_decode_frame, };