110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */
|
|
|
|
static int sup_read_header(AVFormatContext *s)
|
|
{
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codecpar->codec_id = AV_CODEC_ID_HDMV_PGS_SUBTITLE;
|
|
avpriv_set_pts_info(st, 32, 1, 90000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sup_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int64_t pts, dts, pos;
|
|
int ret;
|
|
|
|
pos = avio_tell(s->pb);
|
|
|
|
if (avio_rb16(s->pb) != SUP_PGS_MAGIC)
|
|
return avio_feof(s->pb) ? AVERROR_EOF : AVERROR_INVALIDDATA;
|
|
|
|
pts = avio_rb32(s->pb);
|
|
dts = avio_rb32(s->pb);
|
|
|
|
if ((ret = av_get_packet(s->pb, pkt, 3)) < 0)
|
|
return ret;
|
|
|
|
pkt->stream_index = 0;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
pkt->pos = pos;
|
|
pkt->pts = pts;
|
|
// Many files have DTS set to 0 for all packets, so assume 0 means unset.
|
|
pkt->dts = dts ? dts : AV_NOPTS_VALUE;
|
|
|
|
if (pkt->size >= 3) {
|
|
// The full packet size is stored as part of the packet.
|
|
size_t len = AV_RB16(pkt->data + 1);
|
|
|
|
if ((ret = av_append_packet(s->pb, pkt, len)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sup_probe(const AVProbeData *p)
|
|
{
|
|
unsigned char *buf = p->buf;
|
|
size_t buf_size = p->buf_size;
|
|
int nb_packets;
|
|
|
|
for (nb_packets = 0; nb_packets < 10; nb_packets++) {
|
|
size_t full_packet_size;
|
|
if (buf_size < 10 + 3)
|
|
break;
|
|
if (AV_RB16(buf) != SUP_PGS_MAGIC)
|
|
return 0;
|
|
full_packet_size = AV_RB16(buf + 10 + 1) + 10 + 3;
|
|
if (buf_size < full_packet_size)
|
|
break;
|
|
buf += full_packet_size;
|
|
buf_size -= full_packet_size;
|
|
}
|
|
if (!nb_packets)
|
|
return 0;
|
|
if (nb_packets < 2)
|
|
return AVPROBE_SCORE_RETRY / 2;
|
|
if (nb_packets < 4)
|
|
return AVPROBE_SCORE_RETRY;
|
|
if (nb_packets < 10)
|
|
return AVPROBE_SCORE_EXTENSION;
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
AVInputFormat ff_sup_demuxer = {
|
|
.name = "sup",
|
|
.long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"),
|
|
.extensions = "sup",
|
|
.mime_type = "application/x-pgs",
|
|
.read_probe = sup_probe,
|
|
.read_header = sup_read_header,
|
|
.read_packet = sup_read_packet,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|