mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-13 18:55:08 +00:00
3fa642d60f
The data does not contain timing or trailing line breaks anymore. In addition to being less idiotic, it is consistent with other codecs and thus allows more switches between formats and codecs. It also fixes the issue of the trailing line returns being simple \n instead of CRLF in the ASS rectangle dialogue (this is the reason of the FATE update).
195 lines
6.1 KiB
C
195 lines
6.1 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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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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/**
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* @file
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* SubViewer subtitle demuxer
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* @see https://en.wikipedia.org/wiki/SubViewer
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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#include "libavcodec/internal.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/intreadwrite.h"
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typedef struct {
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FFDemuxSubtitlesQueue q;
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} SubViewerContext;
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static int subviewer_probe(AVProbeData *p)
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{
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char c;
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const unsigned char *ptr = p->buf;
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if (AV_RB24(ptr) == 0xEFBBBF)
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ptr += 3; /* skip UTF-8 BOM */
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if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1)
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return AVPROBE_SCORE_MAX/2;
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if (!strncmp(ptr, "[INFORMATION]", 13))
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return AVPROBE_SCORE_MAX/3;
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return 0;
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}
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static int read_ts(const char *s, int64_t *start, int *duration)
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{
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int64_t end;
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int hh1, mm1, ss1, ms1;
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int hh2, mm2, ss2, ms2;
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if (sscanf(s, "%u:%u:%u.%u,%u:%u:%u.%u",
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&hh1, &mm1, &ss1, &ms1, &hh2, &mm2, &ss2, &ms2) == 8) {
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end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
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*start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
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*duration = end - *start;
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return 0;
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}
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return -1;
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}
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static int subviewer_read_header(AVFormatContext *s)
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{
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SubViewerContext *subviewer = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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AVBPrint header;
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int res = 0, new_event = 1;
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int64_t pts_start = AV_NOPTS_VALUE;
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int duration = -1;
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AVPacket *sub = 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, 100);
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st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codec->codec_id = AV_CODEC_ID_SUBVIEWER;
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av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
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while (!url_feof(s->pb)) {
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char line[2048];
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int64_t pos = 0;
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int len = ff_get_line(s->pb, line, sizeof(line));
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if (!len)
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break;
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line[strcspn(line, "\r\n")] = 0;
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if (line[0] == '[' && strncmp(line, "[br]", 4)) {
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/* ignore event style, XXX: add to side_data? */
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if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") ||
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strstr(line, "[FONT]") || strstr(line, "[STYLE]"))
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continue;
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if (!st->codec->extradata) { // header not finalized yet
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av_bprintf(&header, "%s\n", line);
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if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) {
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/* end of header */
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res = avpriv_bprint_to_extradata(st->codec, &header);
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if (res < 0)
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goto end;
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} else if (strncmp(line, "[INFORMATION]", 13)) {
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/* assume file metadata at this point */
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int i, j = 0;
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char key[32], value[128];
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for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++)
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key[i - 1] = av_tolower(line[i]);
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key[i - 1] = 0;
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if (line[i] == ']')
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i++;
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while (line[i] == ' ')
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i++;
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while (j < sizeof(value) - 1 && line[i] && line[i] != ']')
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value[j++] = line[i++];
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value[j] = 0;
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av_dict_set(&s->metadata, key, value, 0);
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}
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}
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} else if (read_ts(line, &pts_start, &duration) >= 0) {
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new_event = 1;
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pos = avio_tell(s->pb);
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} else if (*line) {
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if (!new_event) {
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sub = ff_subtitles_queue_insert(&subviewer->q, "\n", 1, 1);
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if (!sub) {
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res = AVERROR(ENOMEM);
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goto end;
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}
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}
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sub = ff_subtitles_queue_insert(&subviewer->q, line, strlen(line), !new_event);
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if (!sub) {
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res = AVERROR(ENOMEM);
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goto end;
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}
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if (new_event) {
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sub->pos = pos;
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sub->pts = pts_start;
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sub->duration = duration;
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}
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new_event = 0;
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}
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}
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ff_subtitles_queue_finalize(&subviewer->q);
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end:
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av_bprint_finalize(&header, NULL);
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return res;
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}
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static int subviewer_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SubViewerContext *subviewer = s->priv_data;
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return ff_subtitles_queue_read_packet(&subviewer->q, pkt);
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}
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static int subviewer_read_seek(AVFormatContext *s, int stream_index,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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SubViewerContext *subviewer = s->priv_data;
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return ff_subtitles_queue_seek(&subviewer->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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static int subviewer_read_close(AVFormatContext *s)
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{
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SubViewerContext *subviewer = s->priv_data;
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ff_subtitles_queue_clean(&subviewer->q);
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return 0;
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}
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AVInputFormat ff_subviewer_demuxer = {
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.name = "subviewer",
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.long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"),
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.priv_data_size = sizeof(SubViewerContext),
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.read_probe = subviewer_probe,
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.read_header = subviewer_read_header,
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.read_packet = subviewer_read_packet,
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.read_seek2 = subviewer_read_seek,
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.read_close = subviewer_read_close,
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.extensions = "sub",
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};
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