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92 lines
2.4 KiB
92 lines
2.4 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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typedef struct ASSContext{ |
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unsigned int extra_index; |
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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 != CODEC_ID_SSA){ |
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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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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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put_buffer(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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put_flush_packet(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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put_buffer(s->pb, pkt->data, pkt->size); |
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put_flush_packet(s->pb); |
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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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put_buffer(s->pb, avctx->extradata + ass->extra_index, |
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avctx->extradata_size - ass->extra_index); |
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put_flush_packet(s->pb); |
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return 0; |
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} |
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AVOutputFormat ass_muxer = { |
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"ass", |
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NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle format"), |
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NULL, |
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"ass,ssa", |
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sizeof(ASSContext), |
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CODEC_ID_NONE, |
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CODEC_ID_NONE, |
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write_header, |
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write_packet, |
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write_trailer, |
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.flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS |
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};
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