| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MODS demuxer | ||
| 3 | * Copyright (c) 2015-2016 Florian Nouwt | ||
| 4 | * Copyright (c) 2017 Adib Surani | ||
| 5 | * Copyright (c) 2020 Paul B Mahol | ||
| 6 | * Copyright (c) 2026 Link Mauve | ||
| 7 | * | ||
| 8 | * This file is part of FFmpeg. | ||
| 9 | * | ||
| 10 | * FFmpeg is free software; you can redistribute it and/or | ||
| 11 | * modify it under the terms of the GNU Lesser General Public | ||
| 12 | * License as published by the Free Software Foundation; either | ||
| 13 | * version 2.1 of the License, or (at your option) any later version. | ||
| 14 | * | ||
| 15 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 18 | * Lesser General Public License for more details. | ||
| 19 | * | ||
| 20 | * You should have received a copy of the GNU Lesser General Public | ||
| 21 | * License along with FFmpeg; if not, write to the Free Software | ||
| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 23 | */ | ||
| 24 | |||
| 25 | #include "libavutil/intreadwrite.h" | ||
| 26 | |||
| 27 | #include "avformat.h" | ||
| 28 | #include "demux.h" | ||
| 29 | #include "internal.h" | ||
| 30 | |||
| 31 | typedef struct MODSDemuxContext { | ||
| 32 | uint32_t index_pos; | ||
| 33 | } MODSDemuxContext; | ||
| 34 | |||
| 35 | 7768 | static int mods_probe(const AVProbeData *p) | |
| 36 | { | ||
| 37 |
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7768 | if (memcmp(p->buf, "MODSN3\x0a\x00", 8)) |
| 38 | 7768 | return 0; | |
| 39 | ✗ | if (AV_RB32(p->buf + 8) == 0) | |
| 40 | ✗ | return 0; | |
| 41 | ✗ | if (AV_RB32(p->buf + 12) == 0) | |
| 42 | ✗ | return 0; | |
| 43 | ✗ | if (AV_RB32(p->buf + 16) == 0) | |
| 44 | ✗ | return 0; | |
| 45 | ✗ | return AVPROBE_SCORE_MAX; | |
| 46 | } | ||
| 47 | |||
| 48 | ✗ | static int mods_read_header(AVFormatContext *s) | |
| 49 | { | ||
| 50 | ✗ | AVIOContext *pb = s->pb; | |
| 51 | ✗ | MODSDemuxContext *ctx = s->priv_data; | |
| 52 | AVRational fps; | ||
| 53 | int64_t pos; | ||
| 54 | int64_t timestamp; | ||
| 55 | int num_keyframes; | ||
| 56 | const AVIndexEntry *e; | ||
| 57 | |||
| 58 | ✗ | AVStream *st = avformat_new_stream(s, NULL); | |
| 59 | ✗ | if (!st) | |
| 60 | ✗ | return AVERROR(ENOMEM); | |
| 61 | |||
| 62 | ✗ | avio_skip(pb, 8); | |
| 63 | |||
| 64 | ✗ | st->nb_frames = avio_rl32(pb); | |
| 65 | ✗ | st->duration = st->nb_frames; | |
| 66 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 67 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_MOBICLIP; | |
| 68 | ✗ | st->codecpar->width = avio_rl32(pb); | |
| 69 | ✗ | st->codecpar->height = avio_rl32(pb); | |
| 70 | |||
| 71 | ✗ | fps.num = avio_rl32(pb); | |
| 72 | ✗ | fps.den = 0x1000000; | |
| 73 | ✗ | avpriv_set_pts_info(st, 64, fps.den, fps.num); | |
| 74 | |||
| 75 | ✗ | avio_skip(pb, 16); | |
| 76 | |||
| 77 | ✗ | pos = avio_rl32(pb); | |
| 78 | ✗ | num_keyframes = avio_rl32(pb); | |
| 79 | ✗ | avio_seek(pb, pos, SEEK_SET); | |
| 80 | ✗ | ctx->index_pos = pos; | |
| 81 | |||
| 82 | ✗ | for (int i = 0; i < num_keyframes; ++i) { | |
| 83 | ✗ | timestamp = avio_rl32(pb); | |
| 84 | ✗ | pos = avio_rl32(pb); | |
| 85 | ✗ | if (avio_feof(pb)) | |
| 86 | ✗ | return AVERROR_INVALIDDATA; | |
| 87 | |||
| 88 | ✗ | av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME); | |
| 89 | } | ||
| 90 | |||
| 91 | ✗ | e = avformat_index_get_entry(st, 0); | |
| 92 | ✗ | if (!e) | |
| 93 | ✗ | return AVERROR_INVALIDDATA; | |
| 94 | |||
| 95 | ✗ | avpriv_update_cur_dts(s, st, e->timestamp); | |
| 96 | ✗ | avio_seek(pb, e->pos, SEEK_SET); | |
| 97 | |||
| 98 | ✗ | return 0; | |
| 99 | } | ||
| 100 | |||
| 101 | ✗ | static int mods_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 102 | { | ||
| 103 | ✗ | AVIOContext *pb = s->pb; | |
| 104 | ✗ | MODSDemuxContext *ctx = s->priv_data; | |
| 105 | ✗ | AVStream *st = s->streams[0]; | |
| 106 | unsigned size; | ||
| 107 | int64_t pos; | ||
| 108 | int ret; | ||
| 109 | const AVIndexEntry *e; | ||
| 110 | |||
| 111 | ✗ | if (avio_feof(pb)) | |
| 112 | ✗ | return AVERROR_EOF; | |
| 113 | |||
| 114 | /* This assumes the keyframes index directly follows the last packet. */ | ||
| 115 | ✗ | pos = avio_tell(pb); | |
| 116 | ✗ | if (pos == ctx->index_pos) | |
| 117 | ✗ | return AVERROR_EOF; | |
| 118 | |||
| 119 | ✗ | size = avio_rl32(pb) >> 14; | |
| 120 | ✗ | ret = av_get_packet(pb, pkt, size); | |
| 121 | ✗ | if (ret < 0) | |
| 122 | ✗ | return ret; | |
| 123 | ✗ | pkt->pos = pos; | |
| 124 | ✗ | pkt->stream_index = 0; | |
| 125 | |||
| 126 | ✗ | e = avformat_index_get_entry_from_timestamp(st, ffstream(st)->cur_dts, 0); | |
| 127 | ✗ | if (e && e->pos == pos) { | |
| 128 | ✗ | pkt->flags |= AV_PKT_FLAG_KEY; | |
| 129 | ✗ | pkt->pts = pkt->dts = e->timestamp; | |
| 130 | } | ||
| 131 | |||
| 132 | ✗ | return ret; | |
| 133 | } | ||
| 134 | |||
| 135 | const FFInputFormat ff_mods_demuxer = { | ||
| 136 | .p.name = "mods", | ||
| 137 | .p.long_name = NULL_IF_CONFIG_SMALL("MobiClip MODS"), | ||
| 138 | .p.extensions = "mods", | ||
| 139 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 140 | .priv_data_size = sizeof(MODSDemuxContext), | ||
| 141 | .read_probe = mods_probe, | ||
| 142 | .read_header = mods_read_header, | ||
| 143 | .read_packet = mods_read_packet, | ||
| 144 | }; | ||
| 145 |