| /* |
| * SubRip subtitle demuxer |
| * 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 "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) && !url_feof(s->pb) && 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, |
| }; |