mirror of https://git.ffmpeg.org/ffmpeg.git
132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/*
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* SubRip subtitle demuxer
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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static int srt_probe(AVProbeData *p)
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{
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unsigned char *ptr = p->buf;
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int i, v, num = 0;
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if (AV_RB24(ptr) == 0xEFBBBF)
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ptr += 3; /* skip UTF-8 BOM */
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for (i=0; i<2; i++) {
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if ((num == i || num + 1 == i)
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&& sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1)
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return AVPROBE_SCORE_MAX;
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num = atoi(ptr);
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ptr += strcspn(ptr, "\n") + 1;
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}
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return 0;
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}
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static int srt_read_header(AVFormatContext *s)
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{
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, 1000);
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st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codec->codec_id = AV_CODEC_ID_SUBRIP;
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return 0;
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}
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static int64_t get_pts(char **buf, int *duration,
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int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2)
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{
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int i;
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for (i=0; i<2; i++) {
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int hh1, mm1, ss1, ms1;
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int hh2, mm2, ss2, ms2;
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if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
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"%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
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&hh1, &mm1, &ss1, &ms1,
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&hh2, &mm2, &ss2, &ms2,
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x1, x2, y1, y2) >= 8) {
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int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1;
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int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2;
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*duration = end - start;
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*buf += strcspn(*buf, "\n") + 1;
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return start;
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}
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*buf += strcspn(*buf, "\n") + 1;
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}
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return AV_NOPTS_VALUE;
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}
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static inline int is_eol(char c)
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{
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return c == '\r' || c == '\n';
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}
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static int srt_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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char buffer[2048], *ptr = buffer, *ptr2;
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int64_t pos = avio_tell(s->pb);
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int res = AVERROR_EOF;
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do {
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ptr2 = ptr;
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ptr += ff_get_line(s->pb, ptr, sizeof(buffer)+buffer-ptr);
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} while (!is_eol(*ptr2) && !url_feof(s->pb) && ptr-buffer<sizeof(buffer)-1);
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if (buffer[0]) {
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int64_t pts;
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int duration;
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const char *end = ptr;
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int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1;
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ptr = buffer;
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pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2);
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if (pts != AV_NOPTS_VALUE &&
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!(res = av_new_packet(pkt, end - ptr))) {
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memcpy(pkt->data, ptr, pkt->size);
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->pos = pos;
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pkt->pts = pkt->dts = pts;
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pkt->duration = duration;
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if (x1 != -1) {
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uint8_t *p = av_packet_new_side_data(pkt, AV_PKT_DATA_SUBTITLE_POSITION, 16);
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if (p) {
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AV_WL32(p, x1);
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AV_WL32(p + 4, y1);
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AV_WL32(p + 8, x2);
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AV_WL32(p + 12, y2);
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}
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}
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}
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}
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return res;
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}
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AVInputFormat ff_srt_demuxer = {
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.name = "srt",
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.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
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.read_probe = srt_probe,
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.read_header = srt_read_header,
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.read_packet = srt_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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