| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | #include "avformat.h" | ||
| 20 | #include "demux.h" | ||
| 21 | #include "internal.h" | ||
| 22 | #include "libavutil/intreadwrite.h" | ||
| 23 | |||
| 24 | #define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */ | ||
| 25 | |||
| 26 | 5 | static int sup_read_header(AVFormatContext *s) | |
| 27 | { | ||
| 28 | 5 | AVStream *st = avformat_new_stream(s, NULL); | |
| 29 |
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5 | if (!st) |
| 30 | ✗ | return AVERROR(ENOMEM); | |
| 31 | 5 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
| 32 | 5 | st->codecpar->codec_id = AV_CODEC_ID_HDMV_PGS_SUBTITLE; | |
| 33 | 5 | avpriv_set_pts_info(st, 32, 1, 90000); | |
| 34 | |||
| 35 | 5 | return 0; | |
| 36 | } | ||
| 37 | |||
| 38 | 55 | static int sup_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 39 | { | ||
| 40 | int64_t pts, dts, pos; | ||
| 41 | int ret; | ||
| 42 | |||
| 43 | 55 | pos = avio_tell(s->pb); | |
| 44 | |||
| 45 |
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55 | if (avio_rb16(s->pb) != SUP_PGS_MAGIC) |
| 46 |
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5 | return avio_feof(s->pb) ? AVERROR_EOF : AVERROR_INVALIDDATA; |
| 47 | |||
| 48 | 50 | pts = avio_rb32(s->pb); | |
| 49 | 50 | dts = avio_rb32(s->pb); | |
| 50 | |||
| 51 |
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50 | if ((ret = av_get_packet(s->pb, pkt, 3)) < 0) |
| 52 | ✗ | return ret; | |
| 53 | |||
| 54 | 50 | pkt->stream_index = 0; | |
| 55 | 50 | pkt->flags |= AV_PKT_FLAG_KEY; | |
| 56 | 50 | pkt->pos = pos; | |
| 57 | 50 | pkt->pts = pts; | |
| 58 | // Many files have DTS set to 0 for all packets, so assume 0 means unset. | ||
| 59 |
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50 | pkt->dts = dts ? dts : AV_NOPTS_VALUE; |
| 60 | |||
| 61 |
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50 | if (pkt->size >= 3) { |
| 62 | // The full packet size is stored as part of the packet. | ||
| 63 | 50 | size_t len = AV_RB16(pkt->data + 1); | |
| 64 | |||
| 65 |
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50 | if ((ret = av_append_packet(s->pb, pkt, len)) < 0) |
| 66 | ✗ | return ret; | |
| 67 | } | ||
| 68 | |||
| 69 | 50 | return 0; | |
| 70 | } | ||
| 71 | |||
| 72 | 7128 | static int sup_probe(const AVProbeData *p) | |
| 73 | { | ||
| 74 | 7128 | unsigned char *buf = p->buf; | |
| 75 | 7128 | size_t buf_size = p->buf_size; | |
| 76 | int nb_packets; | ||
| 77 | |||
| 78 |
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7170 | for (nb_packets = 0; nb_packets < 10; nb_packets++) { |
| 79 | size_t full_packet_size; | ||
| 80 |
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7170 | if (buf_size < 10 + 3) |
| 81 | ✗ | break; | |
| 82 |
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7170 | if (AV_RB16(buf) != SUP_PGS_MAGIC) |
| 83 | 7118 | return 0; | |
| 84 | 52 | full_packet_size = AV_RB16(buf + 10 + 1) + 10 + 3; | |
| 85 |
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52 | if (buf_size < full_packet_size) |
| 86 | 10 | break; | |
| 87 | 42 | buf += full_packet_size; | |
| 88 | 42 | buf_size -= full_packet_size; | |
| 89 | } | ||
| 90 |
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10 | if (!nb_packets) |
| 91 | ✗ | return 0; | |
| 92 |
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10 | if (nb_packets < 2) |
| 93 | ✗ | return AVPROBE_SCORE_RETRY / 2; | |
| 94 |
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10 | if (nb_packets < 4) |
| 95 | 8 | return AVPROBE_SCORE_RETRY; | |
| 96 |
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2 | if (nb_packets < 10) |
| 97 | 2 | return AVPROBE_SCORE_EXTENSION; | |
| 98 | ✗ | return AVPROBE_SCORE_MAX; | |
| 99 | } | ||
| 100 | |||
| 101 | const FFInputFormat ff_sup_demuxer = { | ||
| 102 | .p.name = "sup", | ||
| 103 | .p.long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"), | ||
| 104 | .p.extensions = "sup", | ||
| 105 | .p.mime_type = "application/x-pgs", | ||
| 106 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 107 | .read_probe = sup_probe, | ||
| 108 | .read_header = sup_read_header, | ||
| 109 | .read_packet = sup_read_packet, | ||
| 110 | }; | ||
| 111 |