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