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avformat: add SUP/PGS subtitle demuxer
Signed-off-by: Clément Bœsch <u@pkh.me>
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Original file line number | Diff line number | Diff line change |
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/* | ||
* 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 | ||
*/ | ||
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#include "avformat.h" | ||
#include "internal.h" | ||
#include "libavutil/intreadwrite.h" | ||
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#define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */ | ||
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static int sup_read_header(AVFormatContext *s) | ||
{ | ||
AVStream *st = avformat_new_stream(s, NULL); | ||
if (!st) | ||
return AVERROR(ENOMEM); | ||
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | ||
st->codec->codec_id = AV_CODEC_ID_HDMV_PGS_SUBTITLE; | ||
avpriv_set_pts_info(st, 32, 1, 90000); | ||
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return 0; | ||
} | ||
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static int sup_read_packet(AVFormatContext *s, AVPacket *pkt) | ||
{ | ||
int64_t pts, dts, pos; | ||
int ret; | ||
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pos = avio_tell(s->pb); | ||
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if (avio_rb16(s->pb) != SUP_PGS_MAGIC) | ||
return avio_feof(s->pb) ? AVERROR_EOF : AVERROR_INVALIDDATA; | ||
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pts = avio_rb32(s->pb); | ||
dts = avio_rb32(s->pb); | ||
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if ((ret = av_get_packet(s->pb, pkt, 3)) < 0) | ||
return ret; | ||
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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; | ||
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if (pkt->size >= 3) { | ||
// The full packet size is stored as part of the packet. | ||
size_t len = AV_RB16(pkt->data + 1); | ||
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if ((ret = av_append_packet(s->pb, pkt, len)) < 0) | ||
return ret; | ||
} | ||
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return 0; | ||
} | ||
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static int sup_probe(AVProbeData *p) | ||
{ | ||
unsigned char *buf = p->buf; | ||
size_t buf_size = p->buf_size; | ||
int nb_packets; | ||
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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; | ||
} | ||
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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, | ||
}; |
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