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116 lines
3.7 KiB
116 lines
3.7 KiB
/* |
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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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