123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177 |
- /*
- * Copyright (c) 2012 Clément Bœsch
- *
- * 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
- */
- /**
- * @file
- * SubViewer subtitle demuxer
- * @see https://en.wikipedia.org/wiki/SubViewer
- */
- #include "avformat.h"
- #include "internal.h"
- #include "subtitles.h"
- #include "libavutil/avstring.h"
- #include "libavutil/bprint.h"
- #include "libavutil/intreadwrite.h"
- typedef struct {
- FFDemuxSubtitlesQueue q;
- } SubViewerContext;
- static int subviewer_probe(AVProbeData *p)
- {
- char c;
- const unsigned char *ptr = p->buf;
- if (AV_RB24(ptr) == 0xEFBBBF)
- ptr += 3; /* skip UTF-8 BOM */
- if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1)
- return AVPROBE_SCORE_MAX/2;
- if (!strncmp(ptr, "[INFORMATION]", 13))
- return AVPROBE_SCORE_MAX/3;
- return 0;
- }
- static int read_ts(const char *s, int64_t *start, int *duration)
- {
- int64_t end;
- int hh1, mm1, ss1, ms1;
- int hh2, mm2, ss2, ms2;
- if (sscanf(s, "%u:%u:%u.%u,%u:%u:%u.%u",
- &hh1, &mm1, &ss1, &ms1, &hh2, &mm2, &ss2, &ms2) == 8) {
- end = (hh2*3600 + mm2*60 + ss2) * 100 + ms2;
- *start = (hh1*3600 + mm1*60 + ss1) * 100 + ms1;
- *duration = end - *start;
- return 0;
- }
- return -1;
- }
- static int subviewer_read_header(AVFormatContext *s)
- {
- SubViewerContext *subviewer = s->priv_data;
- AVStream *st = avformat_new_stream(s, NULL);
- AVBPrint header;
- int res = 0;
- if (!st)
- return AVERROR(ENOMEM);
- avpriv_set_pts_info(st, 64, 1, 100);
- st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
- st->codec->codec_id = AV_CODEC_ID_SUBVIEWER;
- av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
- while (!url_feof(s->pb)) {
- char line[2048];
- const int64_t pos = avio_tell(s->pb);
- int len = ff_get_line(s->pb, line, sizeof(line));
- if (!len)
- break;
- if (line[0] == '[' && strncmp(line, "[br]", 4)) {
- /* ignore event style, XXX: add to side_data? */
- if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") ||
- strstr(line, "[FONT]") || strstr(line, "[STYLE]"))
- continue;
- if (!st->codec->extradata) { // header not finalized yet
- av_bprintf(&header, "%s", line);
- if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) {
- /* end of header */
- av_bprint_finalize(&header, (char **)&st->codec->extradata);
- if (!st->codec->extradata) {
- res = AVERROR(ENOMEM);
- goto end;
- }
- st->codec->extradata_size = header.len + 1;
- } else if (strncmp(line, "[INFORMATION]", 13)) {
- /* assume file metadata at this point */
- int i, j = 0;
- char key[32], value[128];
- for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++)
- key[i - 1] = av_tolower(line[i]);
- key[i - 1] = 0;
- if (line[i] == ']')
- i++;
- while (line[i] == ' ')
- i++;
- while (j < sizeof(value) - 1 && line[i] && !strchr("]\r\n", line[i]))
- value[j++] = line[i++];
- value[j] = 0;
- av_dict_set(&s->metadata, key, value, 0);
- }
- }
- } else {
- int64_t pts_start = AV_NOPTS_VALUE;
- int duration = -1;
- int timed_line = !read_ts(line, &pts_start, &duration);
- AVPacket *sub;
- sub = ff_subtitles_queue_insert(&subviewer->q, line, len, !timed_line);
- if (!sub) {
- res = AVERROR(ENOMEM);
- goto end;
- }
- if (timed_line) {
- sub->pos = pos;
- sub->pts = pts_start;
- sub->duration = duration;
- }
- }
- }
- ff_subtitles_queue_finalize(&subviewer->q);
- end:
- av_bprint_finalize(&header, NULL);
- return res;
- }
- static int subviewer_read_packet(AVFormatContext *s, AVPacket *pkt)
- {
- SubViewerContext *subviewer = s->priv_data;
- return ff_subtitles_queue_read_packet(&subviewer->q, pkt);
- }
- static int subviewer_read_close(AVFormatContext *s)
- {
- SubViewerContext *subviewer = s->priv_data;
- ff_subtitles_queue_clean(&subviewer->q);
- return 0;
- }
- AVInputFormat ff_subviewer_demuxer = {
- .name = "subviewer",
- .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"),
- .priv_data_size = sizeof(SubViewerContext),
- .read_probe = subviewer_probe,
- .read_header = subviewer_read_header,
- .read_packet = subviewer_read_packet,
- .read_close = subviewer_read_close,
- .flags = AVFMT_GENERIC_INDEX,
- .extensions = "sub",
- };
|