yading@11: /* yading@11: * SubRip subtitle demuxer yading@11: * Copyright (c) 2010 Aurelien Jacobs 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/bprint.h" yading@11: #include "libavutil/intreadwrite.h" yading@11: yading@11: typedef struct { yading@11: FFDemuxSubtitlesQueue q; yading@11: } SRTContext; yading@11: yading@11: static int srt_probe(AVProbeData *p) yading@11: { yading@11: const unsigned char *ptr = p->buf; yading@11: int i, v, num = 0; 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<2; i++) { yading@11: if ((num == i || num + 1 == i) yading@11: && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1) yading@11: return AVPROBE_SCORE_MAX; yading@11: num = atoi(ptr); yading@11: ptr += strcspn(ptr, "\n") + 1; yading@11: } yading@11: return 0; yading@11: } yading@11: yading@11: static int64_t get_pts(const char **buf, int *duration, yading@11: int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2) yading@11: { yading@11: int i; yading@11: yading@11: for (i=0; i<2; i++) { yading@11: int hh1, mm1, ss1, ms1; yading@11: int hh2, mm2, ss2, ms2; yading@11: if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d" yading@11: "%*[ ]X1:%u X2:%u Y1:%u Y2:%u", yading@11: &hh1, &mm1, &ss1, &ms1, yading@11: &hh2, &mm2, &ss2, &ms2, yading@11: x1, x2, y1, y2) >= 8) { yading@11: int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1; yading@11: int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2; yading@11: *duration = end - start; yading@11: *buf += strcspn(*buf, "\n") + 1; yading@11: return start; yading@11: } yading@11: *buf += strcspn(*buf, "\n") + 1; yading@11: } yading@11: return AV_NOPTS_VALUE; yading@11: } yading@11: yading@11: static int srt_read_header(AVFormatContext *s) yading@11: { yading@11: SRTContext *srt = s->priv_data; yading@11: AVBPrint buf; yading@11: AVStream *st = avformat_new_stream(s, NULL); yading@11: int res = 0; yading@11: yading@11: if (!st) yading@11: return AVERROR(ENOMEM); yading@11: avpriv_set_pts_info(st, 64, 1, 1000); yading@11: st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; yading@11: st->codec->codec_id = AV_CODEC_ID_SUBRIP; yading@11: yading@11: av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); yading@11: yading@11: while (!url_feof(s->pb)) { yading@11: ff_subtitles_read_chunk(s->pb, &buf); yading@11: yading@11: if (buf.len) { yading@11: int64_t pos = avio_tell(s->pb); yading@11: int64_t pts; yading@11: int duration; yading@11: const char *ptr = buf.str; yading@11: int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1; yading@11: AVPacket *sub; yading@11: yading@11: pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2); yading@11: if (pts != AV_NOPTS_VALUE) { yading@11: int len = buf.len - (ptr - buf.str); yading@11: if (len <= 0) yading@11: continue; yading@11: sub = ff_subtitles_queue_insert(&srt->q, ptr, len, 0); yading@11: if (!sub) { yading@11: res = AVERROR(ENOMEM); yading@11: goto end; yading@11: } yading@11: sub->pos = pos; yading@11: sub->pts = pts; yading@11: sub->duration = duration; yading@11: if (x1 != -1) { yading@11: uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16); yading@11: if (p) { yading@11: AV_WL32(p, x1); yading@11: AV_WL32(p + 4, y1); yading@11: AV_WL32(p + 8, x2); yading@11: AV_WL32(p + 12, y2); yading@11: } yading@11: } yading@11: } yading@11: } yading@11: } yading@11: yading@11: ff_subtitles_queue_finalize(&srt->q); yading@11: yading@11: end: yading@11: av_bprint_finalize(&buf, NULL); yading@11: return res; yading@11: } yading@11: yading@11: static int srt_read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: SRTContext *srt = s->priv_data; yading@11: return ff_subtitles_queue_read_packet(&srt->q, pkt); yading@11: } yading@11: yading@11: static int srt_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: SRTContext *srt = s->priv_data; yading@11: return ff_subtitles_queue_seek(&srt->q, s, stream_index, yading@11: min_ts, ts, max_ts, flags); yading@11: } yading@11: yading@11: static int srt_read_close(AVFormatContext *s) yading@11: { yading@11: SRTContext *srt = s->priv_data; yading@11: ff_subtitles_queue_clean(&srt->q); yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_srt_demuxer = { yading@11: .name = "srt", yading@11: .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), yading@11: .priv_data_size = sizeof(SRTContext), yading@11: .read_probe = srt_probe, yading@11: .read_header = srt_read_header, yading@11: .read_packet = srt_read_packet, yading@11: .read_seek2 = srt_read_seek, yading@11: .read_close = srt_read_close, yading@11: };