mirror of https://git.ffmpeg.org/ffmpeg.git
271 lines
7.5 KiB
C
271 lines
7.5 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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* JACOsub subtitle demuxer
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* @see http://unicorn.us.com/jacosub/jscripts.html
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* @todo Support P[ALETTE] directive.
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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 "libavcodec/jacosub.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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int shift;
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unsigned timeres;
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FFDemuxSubtitlesQueue q;
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} JACOsubContext;
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static int timed_line(const char *ptr)
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{
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char c;
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return (sscanf(ptr, "%*u:%*u:%*u.%*u %*u:%*u:%*u.%*u %c", &c) == 1 ||
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sscanf(ptr, "@%*u @%*u %c", &c) == 1);
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}
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static int jacosub_probe(AVProbeData *p)
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{
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const char *ptr = p->buf;
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const char *ptr_end = p->buf + p->buf_size;
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if (AV_RB24(ptr) == 0xEFBBBF)
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ptr += 3; /* skip UTF-8 BOM */
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while (ptr < ptr_end) {
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while (jss_whitespace(*ptr))
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ptr++;
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if (*ptr != '#' && *ptr != '\n') {
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if (timed_line(ptr))
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return AVPROBE_SCORE_EXTENSION + 1;
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return 0;
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}
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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 const char * const cmds[] = {
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"CLOCKPAUSE",
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"DIRECTIVE",
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"FONT",
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"HRES",
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"INCLUDE",
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"PALETTE",
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"QUANTIZE",
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"RAMP",
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"SHIFT",
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"TIMERES",
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};
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static int get_jss_cmd(char k)
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{
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int i;
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k = av_toupper(k);
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for (i = 0; i < FF_ARRAY_ELEMS(cmds); i++)
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if (k == cmds[i][0])
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return i;
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return -1;
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}
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static int jacosub_read_close(AVFormatContext *s)
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{
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JACOsubContext *jacosub = s->priv_data;
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ff_subtitles_queue_clean(&jacosub->q);
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return 0;
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}
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static const char *read_ts(JACOsubContext *jacosub, const char *buf,
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int64_t *start, int *duration)
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{
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int len;
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unsigned hs, ms, ss, fs; // hours, minutes, seconds, frame start
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unsigned he, me, se, fe; // hours, minutes, seconds, frame end
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int ts_start, ts_end;
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/* timed format */
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if (sscanf(buf, "%u:%u:%u.%u %u:%u:%u.%u %n",
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&hs, &ms, &ss, &fs,
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&he, &me, &se, &fe, &len) == 8) {
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ts_start = (hs*3600 + ms*60 + ss) * jacosub->timeres + fs;
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ts_end = (he*3600 + me*60 + se) * jacosub->timeres + fe;
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goto shift_and_ret;
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}
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/* timestamps format */
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if (sscanf(buf, "@%u @%u %n", &ts_start, &ts_end, &len) == 2)
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goto shift_and_ret;
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return NULL;
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shift_and_ret:
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ts_start = (ts_start + jacosub->shift) * 100 / jacosub->timeres;
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ts_end = (ts_end + jacosub->shift) * 100 / jacosub->timeres;
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*start = ts_start;
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*duration = ts_start + ts_end;
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return buf + len;
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}
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static int get_shift(int timeres, const char *buf)
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{
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int sign = 1;
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int a = 0, b = 0, c = 0, d = 0;
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#define SSEP "%*1[.:]"
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int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d);
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#undef SSEP
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if (*buf == '-' || a < 0) {
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sign = -1;
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a = FFABS(a);
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}
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switch (n) {
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case 4: return sign * ((a*3600 + b*60 + c) * timeres + d);
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case 3: return sign * (( a*60 + b) * timeres + c);
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case 2: return sign * (( a) * timeres + b);
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}
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return 0;
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}
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static int jacosub_read_header(AVFormatContext *s)
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{
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AVBPrint header;
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AVIOContext *pb = s->pb;
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char line[JSS_MAX_LINESIZE];
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JACOsubContext *jacosub = s->priv_data;
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int shift_set = 0; // only the first shift matters
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int merge_line = 0;
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int i, ret;
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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, 100);
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st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codec->codec_id = AV_CODEC_ID_JACOSUB;
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jacosub->timeres = 30;
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av_bprint_init(&header, 1024+FF_INPUT_BUFFER_PADDING_SIZE, 4096);
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while (!url_feof(pb)) {
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int cmd_len;
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const char *p = line;
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int64_t pos = avio_tell(pb);
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int len = ff_get_line(pb, line, sizeof(line));
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p = jss_skip_whitespace(p);
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/* queue timed line */
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if (merge_line || timed_line(p)) {
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AVPacket *sub;
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sub = ff_subtitles_queue_insert(&jacosub->q, line, len, merge_line);
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if (!sub)
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return AVERROR(ENOMEM);
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sub->pos = pos;
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merge_line = len > 1 && !strcmp(&line[len - 2], "\\\n");
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continue;
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}
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/* skip all non-compiler commands and focus on the command */
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if (*p != '#')
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continue;
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p++;
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i = get_jss_cmd(p[0]);
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if (i == -1)
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continue;
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/* trim command + spaces */
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cmd_len = strlen(cmds[i]);
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if (av_strncasecmp(p, cmds[i], cmd_len) == 0)
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p += cmd_len;
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else
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p++;
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p = jss_skip_whitespace(p);
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/* handle commands which affect the whole script */
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switch (cmds[i][0]) {
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case 'S': // SHIFT command affect the whole script...
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if (!shift_set) {
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jacosub->shift = get_shift(jacosub->timeres, p);
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shift_set = 1;
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}
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av_bprintf(&header, "#S %s", p);
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break;
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case 'T': // ...but must be placed after TIMERES
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jacosub->timeres = strtol(p, NULL, 10);
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if (!jacosub->timeres)
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jacosub->timeres = 30;
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else
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av_bprintf(&header, "#T %s", p);
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break;
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}
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}
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/* general/essential directives in the extradata */
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ret = avpriv_bprint_to_extradata(st->codec, &header);
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if (ret < 0)
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return ret;
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/* SHIFT and TIMERES affect the whole script so packet timing can only be
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* done in a second pass */
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for (i = 0; i < jacosub->q.nb_subs; i++) {
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AVPacket *sub = &jacosub->q.subs[i];
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read_ts(jacosub, sub->data, &sub->pts, &sub->duration);
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}
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ff_subtitles_queue_finalize(&jacosub->q);
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return 0;
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}
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static int jacosub_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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JACOsubContext *jacosub = s->priv_data;
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return ff_subtitles_queue_read_packet(&jacosub->q, pkt);
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}
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static int jacosub_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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JACOsubContext *jacosub = s->priv_data;
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return ff_subtitles_queue_seek(&jacosub->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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AVInputFormat ff_jacosub_demuxer = {
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.name = "jacosub",
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.long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle format"),
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.priv_data_size = sizeof(JACOsubContext),
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.read_probe = jacosub_probe,
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.read_header = jacosub_read_header,
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.read_packet = jacosub_read_packet,
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.read_seek2 = jacosub_read_seek,
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.read_close = jacosub_read_close,
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};
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