117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/*
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* SSA/ASS muxer
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* Copyright (c) 2008 Michael Niedermayer
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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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typedef struct ASSContext{
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unsigned int extra_index;
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int write_ts; // 0: ssa (timing in payload), 1: ass (matroska like)
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}ASSContext;
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static int write_header(AVFormatContext *s)
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{
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ASSContext *ass = s->priv_data;
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AVCodecContext *avctx= s->streams[0]->codec;
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uint8_t *last= NULL;
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if (s->nb_streams != 1 || (avctx->codec_id != AV_CODEC_ID_SSA &&
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avctx->codec_id != AV_CODEC_ID_ASS)) {
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av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n");
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return -1;
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}
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ass->write_ts = avctx->codec_id == AV_CODEC_ID_ASS;
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avpriv_set_pts_info(s->streams[0], 64, 1, 100);
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while(ass->extra_index < avctx->extradata_size){
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uint8_t *p = avctx->extradata + ass->extra_index;
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uint8_t *end= strchr(p, '\n');
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if(!end) end= avctx->extradata + avctx->extradata_size;
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else end++;
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avio_write(s->pb, p, end-p);
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ass->extra_index += end-p;
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if(last && !memcmp(last, "[Events]", 8))
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break;
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last=p;
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}
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avio_flush(s->pb);
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return 0;
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ASSContext *ass = s->priv_data;
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if (ass->write_ts) {
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long int layer;
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char *p;
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int64_t start = pkt->pts;
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int64_t end = start + pkt->duration;
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int hh1, mm1, ss1, ms1;
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int hh2, mm2, ss2, ms2;
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p = pkt->data + strcspn(pkt->data, ",") + 1; // skip ReadOrder
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layer = strtol(p, &p, 10);
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if (*p == ',')
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p++;
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hh1 = (int)(start / 360000); mm1 = (int)(start / 6000) % 60;
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hh2 = (int)(end / 360000); mm2 = (int)(end / 6000) % 60;
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ss1 = (int)(start / 100) % 60; ms1 = (int)(start % 100);
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ss2 = (int)(end / 100) % 60; ms2 = (int)(end % 100);
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if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99;
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if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99;
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avio_printf(s->pb, "Dialogue: %ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
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layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p);
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} else {
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avio_write(s->pb, pkt->data, pkt->size);
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}
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return 0;
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}
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static int write_trailer(AVFormatContext *s)
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{
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ASSContext *ass = s->priv_data;
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AVCodecContext *avctx= s->streams[0]->codec;
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avio_write(s->pb, avctx->extradata + ass->extra_index,
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avctx->extradata_size - ass->extra_index);
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return 0;
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}
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AVOutputFormat ff_ass_muxer = {
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.name = "ass",
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.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
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.mime_type = "text/x-ssa",
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.extensions = "ass,ssa",
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.priv_data_size = sizeof(ASSContext),
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.subtitle_codec = AV_CODEC_ID_SSA,
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.write_header = write_header,
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.write_packet = write_packet,
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.write_trailer = write_trailer,
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.flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS | AVFMT_TS_NONSTRICT,
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};
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