libavformat/microdvdenc.c

   1 /*
   2  * MicroDVD subtitle muxer
   3  * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
   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 <inttypes.h>
  23 #include "avformat.h"
  24 #include "internal.h"
  25 #include "mux.h"
  26
  27 static int microdvd_write_header(struct AVFormatContext *s)
  28 {
  29     AVCodecParameters *par = s->streams[0]->codecpar;
  30     AVRational framerate = s->streams[0]->avg_frame_rate;
  31
  32     if (par->extradata && par->extradata_size > 0) {
  33         avio_write(s->pb, "{DEFAULT}{}", 11);
  34         avio_write(s->pb, par->extradata, par->extradata_size);
  35         avio_w8(s->pb, '\n');
  36     }
  37
  38     avpriv_set_pts_info(s->streams[0], 64, framerate.num, framerate.den);
  39     return 0;
  40 }
  41
  42 static int microdvd_write_packet(AVFormatContext *avf, AVPacket *pkt)
  43 {
  44     avio_printf(avf->pb, "{%"PRId64"}", pkt->pts);
  45     if (pkt->duration < 0)
  46         avio_write(avf->pb, "{}", 2);
  47     else
  48         avio_printf(avf->pb, "{%"PRId64"}", pkt->pts + pkt->duration);
  49     avio_write(avf->pb, pkt->data, pkt->size);
  50     avio_w8(avf->pb, '\n');
  51     return 0;
  52 }
  53
  54 const FFOutputFormat ff_microdvd_muxer = {
  55     .p.name           = "microdvd",
  56     .p.long_name      = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
  57     .p.mime_type      = "text/x-microdvd",
  58     .p.extensions     = "sub",
  59     .p.flags          = AVFMT_NOTIMESTAMPS,
  60     .p.video_codec    = AV_CODEC_ID_NONE,
  61     .p.audio_codec    = AV_CODEC_ID_NONE,
  62     .p.subtitle_codec = AV_CODEC_ID_MICRODVD,
  63     .flags_internal   = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
  64                         FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
  65     .write_header   = microdvd_write_header,
  66     .write_packet   = microdvd_write_packet,
  67 };