/* * SubRip subtitle demuxer * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avformat.h" #include "internal.h" #include "libavutil/intreadwrite.h" static int srt_probe(AVProbeData *p) { unsigned char *ptr = p->buf; int i, v, num = 0; if (AV_RB24(ptr) == 0xEFBBBF) ptr += 3; /* skip UTF-8 BOM */ for (i=0; i<2; i++) { if (num == i && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1) return AVPROBE_SCORE_MAX; num = atoi(ptr); ptr += strcspn(ptr, "\n") + 1; } return 0; } static int srt_read_header(AVFormatContext *s, AVFormatParameters *ap) { AVStream *st = av_new_stream(s, 0); if (!st) return -1; av_set_pts_info(st, 64, 1, 1000); st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codec->codec_id = CODEC_ID_SRT; return 0; } static int64_t get_pts(const char *buf) { int i, v, hour, min, sec, hsec; for (i=0; i<2; i++) { if (sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %*d:%*2d:%*2d%*1[,.]%3d", &hour, &min, &sec, &hsec, &v) == 5) { min += 60*hour; sec += 60*min; return sec*1000+hsec; } buf += strcspn(buf, "\n") + 1; } return AV_NOPTS_VALUE; } static inline int is_eol(char c) { return c == '\r' || c == '\n'; } static int srt_read_packet(AVFormatContext *s, AVPacket *pkt) { char buffer[2048], *ptr = buffer, *ptr2; int64_t pos = avio_tell(s->pb); int res = AVERROR_EOF; do { ptr2 = ptr; ptr += ff_get_line(s->pb, ptr, sizeof(buffer)+buffer-ptr); } while (!is_eol(*ptr2) && !s->pb->eof_reached && ptr-buffer<sizeof(buffer)-1); if (buffer[0] && !(res = av_new_packet(pkt, ptr-buffer))) { memcpy(pkt->data, buffer, pkt->size); pkt->flags |= AV_PKT_FLAG_KEY; pkt->pos = pos; pkt->pts = pkt->dts = get_pts(pkt->data); } return res; } AVInputFormat ff_srt_demuxer = { .name = "srt", .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle format"), .read_probe = srt_probe, .read_header = srt_read_header, .read_packet = srt_read_packet, .flags = AVFMT_GENERIC_INDEX, };