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109 lines
3.2 KiB
109 lines
3.2 KiB
/* |
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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->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
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st->codecpar->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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