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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * This file is part of FFmpeg. |
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| 3 | * |
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| 4 | * FFmpeg is free software; you can redistribute it and/or |
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| 5 | * modify it under the terms of the GNU Lesser General Public |
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| 6 | * License as published by the Free Software Foundation; either |
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| 7 | * version 2.1 of the License, or (at your option) any later version. |
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| 8 | * |
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| 9 | * FFmpeg is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | * Lesser General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU Lesser General Public |
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| 15 | * License along with FFmpeg; if not, write to the Free Software |
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| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 17 | */ |
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| 18 | |||
| 19 | #include "avformat.h" |
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| 20 | #include "internal.h" |
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| 21 | #include "libavutil/intreadwrite.h" |
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| 22 | |||
| 23 | #define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */ |
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| 24 | |||
| 25 | static int sup_read_header(AVFormatContext *s) |
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| 26 | { |
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| 27 | AVStream *st = avformat_new_stream(s, NULL); |
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| 28 | if (!st) |
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| 29 | return AVERROR(ENOMEM); |
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| 30 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
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| 31 | st->codec->codec_id = AV_CODEC_ID_HDMV_PGS_SUBTITLE; |
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| 32 | avpriv_set_pts_info(st, 32, 1, 90000); |
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| 33 | |||
| 34 | return 0; |
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| 35 | } |
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| 36 | |||
| 37 | static int sup_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 38 | { |
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| 39 | int64_t pts, dts, pos; |
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| 40 | int ret; |
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| 41 | |||
| 42 | pos = avio_tell(s->pb); |
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| 43 | |||
| 44 | if (avio_rb16(s->pb) != SUP_PGS_MAGIC) |
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| 45 | return avio_feof(s->pb) ? AVERROR_EOF : AVERROR_INVALIDDATA; |
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| 46 | |||
| 47 | pts = avio_rb32(s->pb); |
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| 48 | dts = avio_rb32(s->pb); |
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| 49 | |||
| 50 | if ((ret = av_get_packet(s->pb, pkt, 3)) < 0) |
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| 51 | return ret; |
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| 52 | |||
| 53 | pkt->stream_index = 0; |
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| 54 | pkt->flags |= AV_PKT_FLAG_KEY; |
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| 55 | pkt->pos = pos; |
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| 56 | pkt->pts = pts; |
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| 57 | // Many files have DTS set to 0 for all packets, so assume 0 means unset. |
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| 58 | pkt->dts = dts ? dts : AV_NOPTS_VALUE; |
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| 59 | |||
| 60 | if (pkt->size >= 3) { |
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| 61 | // The full packet size is stored as part of the packet. |
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| 62 | size_t len = AV_RB16(pkt->data + 1); |
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| 63 | |||
| 64 | if ((ret = av_append_packet(s->pb, pkt, len)) < 0) |
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| 65 | return ret; |
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| 66 | } |
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| 67 | |||
| 68 | return 0; |
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| 69 | } |
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| 70 | |||
| 71 | static int sup_probe(AVProbeData *p) |
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| 72 | { |
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| 73 | unsigned char *buf = p->buf; |
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| 74 | size_t buf_size = p->buf_size; |
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| 75 | int nb_packets; |
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| 76 | |||
| 77 | for (nb_packets = 0; nb_packets < 10; nb_packets++) { |
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| 78 | size_t full_packet_size; |
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| 79 | if (buf_size < 10 + 3) |
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| 80 | break; |
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| 81 | if (AV_RB16(buf) != SUP_PGS_MAGIC) |
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| 82 | return 0; |
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| 83 | full_packet_size = AV_RB16(buf + 10 + 1) + 10 + 3; |
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| 84 | if (buf_size < full_packet_size) |
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| 85 | break; |
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| 86 | buf += full_packet_size; |
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| 87 | buf_size -= full_packet_size; |
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| 88 | } |
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| 89 | if (!nb_packets) |
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| 90 | return 0; |
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| 91 | if (nb_packets < 2) |
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| 92 | return AVPROBE_SCORE_RETRY / 2; |
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| 93 | if (nb_packets < 4) |
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| 94 | return AVPROBE_SCORE_RETRY; |
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| 95 | if (nb_packets < 10) |
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| 96 | return AVPROBE_SCORE_EXTENSION; |
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| 97 | return AVPROBE_SCORE_MAX; |
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| 98 | } |
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| 99 | |||
| 100 | AVInputFormat ff_sup_demuxer = { |
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| 101 | .name = "sup", |
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| 102 | .long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"), |
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| 103 | .extensions = "sup", |
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| 104 | .mime_type = "application/x-pgs", |
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| 105 | .read_probe = sup_probe, |
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| 106 | .read_header = sup_read_header, |
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| 107 | .read_packet = sup_read_packet, |
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| 108 | .flags = AVFMT_GENERIC_INDEX, |
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| 109 | }; |