yading@11: /* yading@11: * MicroDVD subtitle demuxer yading@11: * Copyright (c) 2010 Aurelien Jacobs yading@11: * Copyright (c) 2012 Clément Bœsch yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: #include "subtitles.h" yading@11: #include "libavutil/intreadwrite.h" yading@11: yading@11: #define MAX_LINESIZE 2048 yading@11: yading@11: yading@11: typedef struct { yading@11: FFDemuxSubtitlesQueue q; yading@11: } MicroDVDContext; yading@11: yading@11: yading@11: static int microdvd_probe(AVProbeData *p) yading@11: { yading@11: unsigned char c; yading@11: const uint8_t *ptr = p->buf; yading@11: int i; yading@11: yading@11: if (AV_RB24(ptr) == 0xEFBBBF) yading@11: ptr += 3; /* skip UTF-8 BOM */ yading@11: yading@11: for (i=0; i<3; i++) { yading@11: if (sscanf(ptr, "{%*d}{}%c", &c) != 1 && yading@11: sscanf(ptr, "{%*d}{%*d}%c", &c) != 1 && yading@11: sscanf(ptr, "{DEFAULT}{}%c", &c) != 1) yading@11: return 0; yading@11: ptr += strcspn(ptr, "\n") + 1; yading@11: } yading@11: return AVPROBE_SCORE_MAX; yading@11: } yading@11: yading@11: static int64_t get_pts(const char *buf) yading@11: { yading@11: int frame; yading@11: char c; yading@11: yading@11: if (sscanf(buf, "{%d}{%c", &frame, &c) == 2) yading@11: return frame; yading@11: return AV_NOPTS_VALUE; yading@11: } yading@11: yading@11: static int get_duration(const char *buf) yading@11: { yading@11: int frame_start, frame_end; yading@11: yading@11: if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2) yading@11: return frame_end - frame_start; yading@11: return -1; yading@11: } yading@11: yading@11: static int microdvd_read_header(AVFormatContext *s) yading@11: { yading@11: AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */ yading@11: MicroDVDContext *microdvd = s->priv_data; yading@11: AVStream *st = avformat_new_stream(s, NULL); yading@11: int i = 0; yading@11: char line[MAX_LINESIZE]; yading@11: yading@11: if (!st) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: while (!url_feof(s->pb)) { yading@11: char *p = line; yading@11: AVPacket *sub; yading@11: int64_t pos = avio_tell(s->pb); yading@11: int len = ff_get_line(s->pb, line, sizeof(line)); yading@11: yading@11: if (!len) yading@11: break; yading@11: line[strcspn(line, "\r\n")] = 0; yading@11: if (i++ < 3) { yading@11: int frame; yading@11: double fps; yading@11: char c; yading@11: yading@11: if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 || yading@11: sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2) yading@11: && frame <= 1 && fps > 3 && fps < 100) yading@11: pts_info = av_d2q(fps, 100000); yading@11: if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) { yading@11: st->codec->extradata = av_strdup(line + 11); yading@11: if (!st->codec->extradata) yading@11: return AVERROR(ENOMEM); yading@11: st->codec->extradata_size = strlen(st->codec->extradata) + 1; yading@11: continue; yading@11: } yading@11: } yading@11: #define SKIP_FRAME_ID \ yading@11: p = strchr(p, '}'); \ yading@11: if (!p) { \ yading@11: av_log(s, AV_LOG_WARNING, "Invalid event \"%s\"" \ yading@11: " at line %d\n", line, i); \ yading@11: continue; \ yading@11: } \ yading@11: p++ yading@11: SKIP_FRAME_ID; yading@11: SKIP_FRAME_ID; yading@11: if (!*p) yading@11: continue; yading@11: sub = ff_subtitles_queue_insert(µdvd->q, p, strlen(p), 0); yading@11: if (!sub) yading@11: return AVERROR(ENOMEM); yading@11: sub->pos = pos; yading@11: sub->pts = get_pts(line); yading@11: sub->duration = get_duration(line); yading@11: } yading@11: ff_subtitles_queue_finalize(µdvd->q); yading@11: avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num); yading@11: st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; yading@11: st->codec->codec_id = AV_CODEC_ID_MICRODVD; yading@11: return 0; yading@11: } yading@11: yading@11: static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: MicroDVDContext *microdvd = s->priv_data; yading@11: return ff_subtitles_queue_read_packet(µdvd->q, pkt); yading@11: } yading@11: yading@11: static int microdvd_read_seek(AVFormatContext *s, int stream_index, yading@11: int64_t min_ts, int64_t ts, int64_t max_ts, int flags) yading@11: { yading@11: MicroDVDContext *microdvd = s->priv_data; yading@11: return ff_subtitles_queue_seek(µdvd->q, s, stream_index, yading@11: min_ts, ts, max_ts, flags); yading@11: } yading@11: yading@11: static int microdvd_read_close(AVFormatContext *s) yading@11: { yading@11: MicroDVDContext *microdvd = s->priv_data; yading@11: ff_subtitles_queue_clean(µdvd->q); yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_microdvd_demuxer = { yading@11: .name = "microdvd", yading@11: .long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"), yading@11: .priv_data_size = sizeof(MicroDVDContext), yading@11: .read_probe = microdvd_probe, yading@11: .read_header = microdvd_read_header, yading@11: .read_packet = microdvd_read_packet, yading@11: .read_seek2 = microdvd_read_seek, yading@11: .read_close = microdvd_read_close, yading@11: };