1/* 2 * SSA/ASS muxer 3 * Copyright (c) 2008 Michael Niedermayer 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "avformat.h" 23 24typedef struct ASSContext{ 25 unsigned int extra_index; 26}ASSContext; 27 28static int write_header(AVFormatContext *s) 29{ 30 ASSContext *ass = s->priv_data; 31 AVCodecContext *avctx= s->streams[0]->codec; 32 uint8_t *last= NULL; 33 34 if(s->nb_streams != 1 || avctx->codec_id != CODEC_ID_SSA){ 35 av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n"); 36 return -1; 37 } 38 39 while(ass->extra_index < avctx->extradata_size){ 40 uint8_t *p = avctx->extradata + ass->extra_index; 41 uint8_t *end= strchr(p, '\n'); 42 if(!end) end= avctx->extradata + avctx->extradata_size; 43 else end++; 44 45 put_buffer(s->pb, p, end-p); 46 ass->extra_index += end-p; 47 48 if(last && !memcmp(last, "[Events]", 8)) 49 break; 50 last=p; 51 } 52 53 put_flush_packet(s->pb); 54 55 return 0; 56} 57 58static int write_packet(AVFormatContext *s, AVPacket *pkt) 59{ 60 put_buffer(s->pb, pkt->data, pkt->size); 61 62 put_flush_packet(s->pb); 63 64 return 0; 65} 66 67static int write_trailer(AVFormatContext *s) 68{ 69 ASSContext *ass = s->priv_data; 70 AVCodecContext *avctx= s->streams[0]->codec; 71 72 put_buffer(s->pb, avctx->extradata + ass->extra_index, 73 avctx->extradata_size - ass->extra_index); 74 75 put_flush_packet(s->pb); 76 77 return 0; 78} 79 80AVOutputFormat ass_muxer = { 81 "ass", 82 NULL_IF_CONFIG_SMALL("SSA/ASS format"), 83 NULL, 84 "ass,ssa", 85 sizeof(ASSContext), 86 CODEC_ID_NONE, 87 CODEC_ID_NONE, 88 write_header, 89 write_packet, 90 write_trailer, 91 .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS 92}; 93