/* * MicroDVD subtitle demuxer * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> * Copyright (c) 2012 Clément Bœsch <ubitux@gmail.com> * * 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 "subtitles.h" #include "libavutil/intreadwrite.h" #define MAX_LINESIZE 2048 typedef struct { FFDemuxSubtitlesQueue q; } MicroDVDContext; static int microdvd_probe(AVProbeData *p) { unsigned char c, *ptr = p->buf; int i; if (AV_RB24(ptr) == 0xEFBBBF) ptr += 3; /* skip UTF-8 BOM */ for (i=0; i<3; i++) { if (sscanf(ptr, "{%*d}{}%c", &c) != 1 && sscanf(ptr, "{%*d}{%*d}%c", &c) != 1 && sscanf(ptr, "{DEFAULT}{}%c", &c) != 1) return 0; ptr += strcspn(ptr, "\n") + 1; } return AVPROBE_SCORE_MAX; } static int64_t get_pts(const char *buf) { int frame; char c; if (sscanf(buf, "{%d}{%c", &frame, &c) == 2) return frame; return AV_NOPTS_VALUE; } static int get_duration(const char *buf) { int frame_start, frame_end; if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2) return frame_end - frame_start; return -1; } static int microdvd_read_header(AVFormatContext *s) { AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */ MicroDVDContext *microdvd = s->priv_data; AVStream *st = avformat_new_stream(s, NULL); int i = 0; char line[MAX_LINESIZE]; if (!st) return AVERROR(ENOMEM); while (!url_feof(s->pb)) { AVPacket *sub; int64_t pos = avio_tell(s->pb); int len = ff_get_line(s->pb, line, sizeof(line)); if (!len) break; if (i < 3) { int frame; double fps; char c; i++; if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 || sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2) && frame <= 1 && fps > 3 && fps < 100) pts_info = av_d2q(fps, 100000); if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) { st->codec->extradata = av_strdup(line + 11); if (!st->codec->extradata) return AVERROR(ENOMEM); st->codec->extradata_size = strlen(st->codec->extradata) + 1; continue; } } sub = ff_subtitles_queue_insert(µdvd->q, line, len, 0); if (!sub) return AVERROR(ENOMEM); sub->pos = pos; sub->pts = get_pts(sub->data); sub->duration = get_duration(sub->data); } ff_subtitles_queue_finalize(µdvd->q); avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num); st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codec->codec_id = CODEC_ID_MICRODVD; return 0; } static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt) { MicroDVDContext *microdvd = s->priv_data; return ff_subtitles_queue_read_packet(µdvd->q, pkt); } static int microdvd_read_close(AVFormatContext *s) { MicroDVDContext *microdvd = s->priv_data; ff_subtitles_queue_clean(µdvd->q); return 0; } AVInputFormat ff_microdvd_demuxer = { .name = "microdvd", .long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"), .priv_data_size = sizeof(MicroDVDContext), .read_probe = microdvd_probe, .read_header = microdvd_read_header, .read_packet = microdvd_read_packet, .read_close = microdvd_read_close, .flags = AVFMT_GENERIC_INDEX, };