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