Libav 0.7.1
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00001 /* 00002 * SSA/ASS muxer 00003 * Copyright (c) 2008 Michael Niedermayer 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avformat.h" 00023 00024 typedef struct ASSContext{ 00025 unsigned int extra_index; 00026 }ASSContext; 00027 00028 static int write_header(AVFormatContext *s) 00029 { 00030 ASSContext *ass = s->priv_data; 00031 AVCodecContext *avctx= s->streams[0]->codec; 00032 uint8_t *last= NULL; 00033 00034 if(s->nb_streams != 1 || avctx->codec_id != CODEC_ID_SSA){ 00035 av_log(s, AV_LOG_ERROR, "Exactly one ASS/SSA stream is needed.\n"); 00036 return -1; 00037 } 00038 00039 while(ass->extra_index < avctx->extradata_size){ 00040 uint8_t *p = avctx->extradata + ass->extra_index; 00041 uint8_t *end= strchr(p, '\n'); 00042 if(!end) end= avctx->extradata + avctx->extradata_size; 00043 else end++; 00044 00045 avio_write(s->pb, p, end-p); 00046 ass->extra_index += end-p; 00047 00048 if(last && !memcmp(last, "[Events]", 8)) 00049 break; 00050 last=p; 00051 } 00052 00053 avio_flush(s->pb); 00054 00055 return 0; 00056 } 00057 00058 static int write_packet(AVFormatContext *s, AVPacket *pkt) 00059 { 00060 avio_write(s->pb, pkt->data, pkt->size); 00061 00062 avio_flush(s->pb); 00063 00064 return 0; 00065 } 00066 00067 static int write_trailer(AVFormatContext *s) 00068 { 00069 ASSContext *ass = s->priv_data; 00070 AVCodecContext *avctx= s->streams[0]->codec; 00071 00072 avio_write(s->pb, avctx->extradata + ass->extra_index, 00073 avctx->extradata_size - ass->extra_index); 00074 00075 avio_flush(s->pb); 00076 00077 return 0; 00078 } 00079 00080 AVOutputFormat ff_ass_muxer = { 00081 .name = "ass", 00082 .long_name = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle format"), 00083 .mime_type = "text/x-ssa", 00084 .extensions = "ass,ssa", 00085 .priv_data_size = sizeof(ASSContext), 00086 .subtitle_codec = CODEC_ID_SSA, 00087 .write_header = write_header, 00088 .write_packet = write_packet, 00089 .write_trailer = write_trailer, 00090 .flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS, 00091 };