| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * PDV demuxer | ||
| 3 | * Copyright (c) 2023 Paul B Mahol | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/mem.h" | ||
| 23 | #include "avformat.h" | ||
| 24 | #include "demux.h" | ||
| 25 | #include "internal.h" | ||
| 26 | |||
| 27 | #define PDV_MAGIC "Playdate VID\x00\x00\x00\x00" | ||
| 28 | |||
| 29 | typedef struct PDVDemuxContext { | ||
| 30 | int current_frame; | ||
| 31 | uint8_t *frame_flags; | ||
| 32 | uint32_t *frame_offsets; | ||
| 33 | } PDVDemuxContext; | ||
| 34 | |||
| 35 | 7186 | static int pdv_probe(const AVProbeData *pd) | |
| 36 | { | ||
| 37 |
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7186 | if (strncmp(pd->buf, PDV_MAGIC, sizeof(PDV_MAGIC) - 1) == 0) |
| 38 | ✗ | return AVPROBE_SCORE_MAX; | |
| 39 | 7186 | return 0; | |
| 40 | } | ||
| 41 | |||
| 42 | ✗ | static int pdv_read_header(AVFormatContext *s) | |
| 43 | { | ||
| 44 | ✗ | PDVDemuxContext *p = s->priv_data; | |
| 45 | ✗ | AVIOContext *pb = s->pb; | |
| 46 | AVCodecParameters *par; | ||
| 47 | AVStream *st; | ||
| 48 | uint64_t start; | ||
| 49 | uint32_t fps; | ||
| 50 | |||
| 51 | ✗ | avio_skip(pb, 16); | |
| 52 | |||
| 53 | ✗ | st = avformat_new_stream(s, NULL); | |
| 54 | ✗ | if (!st) | |
| 55 | ✗ | return AVERROR(ENOMEM); | |
| 56 | |||
| 57 | ✗ | par = st->codecpar; | |
| 58 | ✗ | par->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 59 | ✗ | par->codec_id = AV_CODEC_ID_PDV; | |
| 60 | ✗ | st->start_time = 0; | |
| 61 | ✗ | st->duration = | |
| 62 | ✗ | st->nb_frames = avio_rl16(pb); | |
| 63 | ✗ | avio_skip(pb, 2); | |
| 64 | ✗ | fps = avio_rl32(pb); | |
| 65 | ✗ | st->avg_frame_rate = av_d2q(av_int2float(fps), INT_MAX); | |
| 66 | ✗ | par->width = avio_rl16(pb); | |
| 67 | ✗ | par->height = avio_rl16(pb); | |
| 68 | |||
| 69 | ✗ | avpriv_set_pts_info(st, 64, st->avg_frame_rate.den, st->avg_frame_rate.num); | |
| 70 | |||
| 71 | ✗ | p->current_frame = 0; | |
| 72 | ✗ | p->frame_flags = av_calloc(st->nb_frames + 1, sizeof(*p->frame_flags)); | |
| 73 | ✗ | p->frame_offsets = av_calloc(st->nb_frames + 1, sizeof(*p->frame_offsets)); | |
| 74 | |||
| 75 | ✗ | if (!p->frame_flags || !p->frame_offsets) | |
| 76 | ✗ | return AVERROR(ENOMEM); | |
| 77 | |||
| 78 | ✗ | for (int n = 0; n <= st->nb_frames; n++) { | |
| 79 | ✗ | const uint32_t entry = avio_rl32(pb); | |
| 80 | |||
| 81 | ✗ | p->frame_flags[n] = entry & 3; | |
| 82 | ✗ | p->frame_offsets[n] = entry >> 2; | |
| 83 | } | ||
| 84 | |||
| 85 | ✗ | start = avio_tell(pb); | |
| 86 | |||
| 87 | ✗ | for (int n = 0; n < st->nb_frames; n++) { | |
| 88 | ✗ | const uint64_t pos = start + p->frame_offsets[n]; | |
| 89 | ✗ | const int32_t size = p->frame_offsets[n+1] - p->frame_offsets[n]; | |
| 90 | ✗ | const int flags = p->frame_flags[n] & 1 ? AVINDEX_KEYFRAME : 0; | |
| 91 | |||
| 92 | ✗ | if (p->frame_flags[n] == 0 || size <= 0 || | |
| 93 | ✗ | ((pb->seekable & AVIO_SEEKABLE_NORMAL) && pos + size > avio_size(pb))) | |
| 94 | break; | ||
| 95 | ✗ | av_add_index_entry(st, pos, n, size, 0, flags); | |
| 96 | } | ||
| 97 | |||
| 98 | ✗ | return 0; | |
| 99 | } | ||
| 100 | |||
| 101 | ✗ | static int pdv_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 102 | { | ||
| 103 | ✗ | PDVDemuxContext *p = s->priv_data; | |
| 104 | ✗ | AVStream *st = s->streams[0]; | |
| 105 | ✗ | FFStream *const sti = ffstream(st); | |
| 106 | ✗ | AVIOContext *pb = s->pb; | |
| 107 | int32_t size, flags, ret; | ||
| 108 | int64_t pos; | ||
| 109 | |||
| 110 | ✗ | if (p->current_frame >= st->nb_frames) | |
| 111 | ✗ | return AVERROR_EOF; | |
| 112 | |||
| 113 | ✗ | if (p->current_frame >= sti->nb_index_entries) | |
| 114 | ✗ | return AVERROR(EIO); | |
| 115 | |||
| 116 | ✗ | pos = sti->index_entries[p->current_frame].pos; | |
| 117 | ✗ | flags = sti->index_entries[p->current_frame].flags; | |
| 118 | ✗ | size = sti->index_entries[p->current_frame].size; | |
| 119 | |||
| 120 | ✗ | avio_seek(pb, pos, SEEK_SET); | |
| 121 | ✗ | if (avio_feof(pb) || ((pb->seekable & AVIO_SEEKABLE_NORMAL) && pos + size > avio_size(pb)) || size == 0) | |
| 122 | ✗ | return AVERROR_EOF; | |
| 123 | |||
| 124 | ✗ | ret = av_get_packet(pb, pkt, size); | |
| 125 | ✗ | if (ret < 0) | |
| 126 | ✗ | return ret; | |
| 127 | |||
| 128 | ✗ | if (flags & AVINDEX_KEYFRAME) | |
| 129 | ✗ | pkt->flags |= AV_PKT_FLAG_KEY; | |
| 130 | ✗ | pkt->stream_index = 0; | |
| 131 | ✗ | pkt->pts = p->current_frame++; | |
| 132 | ✗ | pkt->duration = 1; | |
| 133 | |||
| 134 | ✗ | return 0; | |
| 135 | } | ||
| 136 | |||
| 137 | ✗ | static int pdv_read_close(AVFormatContext *s) | |
| 138 | { | ||
| 139 | ✗ | PDVDemuxContext *p = s->priv_data; | |
| 140 | |||
| 141 | ✗ | av_freep(&p->frame_flags); | |
| 142 | ✗ | av_freep(&p->frame_offsets); | |
| 143 | |||
| 144 | ✗ | return 0; | |
| 145 | } | ||
| 146 | |||
| 147 | ✗ | static int pdv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) | |
| 148 | { | ||
| 149 | ✗ | PDVDemuxContext *p = s->priv_data; | |
| 150 | ✗ | AVStream *st = s->streams[stream_index]; | |
| 151 | ✗ | int index = av_index_search_timestamp(st, timestamp, flags); | |
| 152 | |||
| 153 | ✗ | if (index < 0) | |
| 154 | ✗ | return -1; | |
| 155 | |||
| 156 | ✗ | if (avio_seek(s->pb, ffstream(st)->index_entries[index].pos, SEEK_SET) < 0) | |
| 157 | ✗ | return -1; | |
| 158 | |||
| 159 | ✗ | p->current_frame = index; | |
| 160 | |||
| 161 | ✗ | return 0; | |
| 162 | } | ||
| 163 | |||
| 164 | const FFInputFormat ff_pdv_demuxer = { | ||
| 165 | .p.name = "pdv", | ||
| 166 | .p.long_name = NULL_IF_CONFIG_SMALL("PlayDate Video"), | ||
| 167 | .p.extensions = "pdv", | ||
| 168 | .priv_data_size = sizeof(PDVDemuxContext), | ||
| 169 | .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | ||
| 170 | .read_probe = pdv_probe, | ||
| 171 | .read_header = pdv_read_header, | ||
| 172 | .read_packet = pdv_read_packet, | ||
| 173 | .read_close = pdv_read_close, | ||
| 174 | .read_seek = pdv_read_seek, | ||
| 175 | }; | ||
| 176 |