/* * 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 "subtitles.h" #include "libavutil/bprint.h" #include "libavutil/intreadwrite.h" typedef struct { FFDemuxSubtitlesQueue q; } SRTContext; static int srt_probe(AVProbeData *p) { const unsigned char *ptr = p->buf; int i, v, num = 0; if (AV_RB24(ptr) == 0xEFBBBF) ptr += 3; /* skip UTF-8 BOM */ while (*ptr == '\r' || *ptr == '\n') ptr++; for (i=0; i<2; i++) { if ((num == i || num + 1 == i) && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1) return AVPROBE_SCORE_MAX; num = atoi(ptr); ptr += ff_subtitles_next_line(ptr); } return 0; } static int64_t get_pts(const char **buf, int *duration, int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2) { int i; for (i=0; i<2; i++) { int hh1, mm1, ss1, ms1; int hh2, mm2, ss2, ms2; if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d" "%*[ ]X1:%u X2:%u Y1:%u Y2:%u", &hh1, &mm1, &ss1, &ms1, &hh2, &mm2, &ss2, &ms2, x1, x2, y1, y2) >= 8) { int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1; int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2; *duration = end - start; *buf += ff_subtitles_next_line(*buf); return start; } *buf += ff_subtitles_next_line(*buf); } return AV_NOPTS_VALUE; } static int srt_read_header(AVFormatContext *s) { SRTContext *srt = s->priv_data; AVBPrint buf; AVStream *st = avformat_new_stream(s, NULL); int res = 0; if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 64, 1, 1000); st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codec->codec_id = AV_CODEC_ID_SUBRIP; av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); while (!url_feof(s->pb)) { ff_subtitles_read_chunk(s->pb, &buf); if (buf.len) { int64_t pos = avio_tell(s->pb); int64_t pts; int duration; const char *ptr = buf.str; int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1; AVPacket *sub; pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2); if (pts != AV_NOPTS_VALUE) { int len = buf.len - (ptr - buf.str); if (len <= 0) continue; sub = ff_subtitles_queue_insert(&srt->q, ptr, len, 0); if (!sub) { res = AVERROR(ENOMEM); goto end; } sub->pos = pos; sub->pts = pts; sub->duration = duration; if (x1 != -1) { uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16); if (p) { AV_WL32(p, x1); AV_WL32(p + 4, y1); AV_WL32(p + 8, x2); AV_WL32(p + 12, y2); } } } } } ff_subtitles_queue_finalize(&srt->q); end: av_bprint_finalize(&buf, NULL); return res; } static int srt_read_packet(AVFormatContext *s, AVPacket *pkt) { SRTContext *srt = s->priv_data; return ff_subtitles_queue_read_packet(&srt->q, pkt); } static int srt_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags) { SRTContext *srt = s->priv_data; return ff_subtitles_queue_seek(&srt->q, s, stream_index, min_ts, ts, max_ts, flags); } static int srt_read_close(AVFormatContext *s) { SRTContext *srt = s->priv_data; ff_subtitles_queue_clean(&srt->q); return 0; } AVInputFormat ff_srt_demuxer = { .name = "srt", .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), .priv_data_size = sizeof(SRTContext), .read_probe = srt_probe, .read_header = srt_read_header, .read_packet = srt_read_packet, .read_seek2 = srt_read_seek, .read_close = srt_read_close, };