| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Microsoft Windows ICO demuxer | ||
| 3 | * Copyright (c) 2011 Peter Ross (pross@xvid.org) | ||
| 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 | /** | ||
| 23 | * @file | ||
| 24 | * Microsoft Windows ICO demuxer | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/intreadwrite.h" | ||
| 28 | #include "libavutil/mem.h" | ||
| 29 | #include "libavcodec/bytestream.h" | ||
| 30 | #include "libavcodec/png.h" | ||
| 31 | #include "avformat.h" | ||
| 32 | #include "demux.h" | ||
| 33 | #include "internal.h" | ||
| 34 | |||
| 35 | typedef struct { | ||
| 36 | int offset; | ||
| 37 | int size; | ||
| 38 | int nb_pal; | ||
| 39 | } IcoImage; | ||
| 40 | |||
| 41 | typedef struct { | ||
| 42 | int current_image; | ||
| 43 | int nb_images; | ||
| 44 | IcoImage * images; | ||
| 45 | } IcoDemuxContext; | ||
| 46 | |||
| 47 | 8071 | static int probe(const AVProbeData *p) | |
| 48 | { | ||
| 49 | 8071 | unsigned i, frames, checked = 0; | |
| 50 | |||
| 51 |
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8071 | if (p->buf_size < 22 || AV_RL16(p->buf) || AV_RL16(p->buf + 2) != 1) |
| 52 | 8062 | return 0; | |
| 53 | 9 | frames = AV_RL16(p->buf + 4); | |
| 54 |
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9 | if (!frames) |
| 55 | 9 | return 0; | |
| 56 | ✗ | for (i = 0; i < frames && i * 16 + 22 <= p->buf_size; i++) { | |
| 57 | unsigned offset; | ||
| 58 | ✗ | if (AV_RL16(p->buf + 10 + i * 16) & ~1) | |
| 59 | ✗ | return FFMIN(i, AVPROBE_SCORE_MAX / 4); | |
| 60 | ✗ | if (p->buf[13 + i * 16]) | |
| 61 | ✗ | return FFMIN(i, AVPROBE_SCORE_MAX / 4); | |
| 62 | ✗ | if (AV_RL32(p->buf + 14 + i * 16) < 40) | |
| 63 | ✗ | return FFMIN(i, AVPROBE_SCORE_MAX / 4); | |
| 64 | ✗ | offset = AV_RL32(p->buf + 18 + i * 16); | |
| 65 | ✗ | if (offset < 22) | |
| 66 | ✗ | return FFMIN(i, AVPROBE_SCORE_MAX / 4); | |
| 67 | ✗ | if (offset > p->buf_size - 8) | |
| 68 | ✗ | continue; | |
| 69 | ✗ | if (p->buf[offset] != 40 && AV_RB64(p->buf + offset) != PNGSIG) | |
| 70 | ✗ | return FFMIN(i, AVPROBE_SCORE_MAX / 4); | |
| 71 | ✗ | checked++; | |
| 72 | } | ||
| 73 | |||
| 74 | ✗ | if (checked < frames) | |
| 75 | ✗ | return AVPROBE_SCORE_MAX / 4 + FFMIN(checked, 1); | |
| 76 | ✗ | return AVPROBE_SCORE_MAX / 2 + 1; | |
| 77 | } | ||
| 78 | |||
| 79 | ✗ | static int read_header(AVFormatContext *s) | |
| 80 | { | ||
| 81 | ✗ | IcoDemuxContext *ico = s->priv_data; | |
| 82 | ✗ | AVIOContext *pb = s->pb; | |
| 83 | int i, codec; | ||
| 84 | |||
| 85 | ✗ | avio_skip(pb, 4); | |
| 86 | ✗ | ico->nb_images = avio_rl16(pb); | |
| 87 | |||
| 88 | ✗ | if (!ico->nb_images) | |
| 89 | ✗ | return AVERROR_INVALIDDATA; | |
| 90 | |||
| 91 | ✗ | ico->images = av_malloc_array(ico->nb_images, sizeof(IcoImage)); | |
| 92 | ✗ | if (!ico->images) | |
| 93 | ✗ | return AVERROR(ENOMEM); | |
| 94 | |||
| 95 | ✗ | for (i = 0; i < ico->nb_images; i++) { | |
| 96 | AVStream *st; | ||
| 97 | int tmp; | ||
| 98 | |||
| 99 | ✗ | if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0) | |
| 100 | ✗ | return AVERROR_INVALIDDATA; | |
| 101 | |||
| 102 | ✗ | st = avformat_new_stream(s, NULL); | |
| 103 | ✗ | if (!st) | |
| 104 | ✗ | return AVERROR(ENOMEM); | |
| 105 | |||
| 106 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 107 | ✗ | st->codecpar->width = avio_r8(pb); | |
| 108 | ✗ | st->codecpar->height = avio_r8(pb); | |
| 109 | ✗ | ico->images[i].nb_pal = avio_r8(pb); | |
| 110 | ✗ | if (ico->images[i].nb_pal == 255) | |
| 111 | ✗ | ico->images[i].nb_pal = 0; | |
| 112 | |||
| 113 | ✗ | avio_skip(pb, 5); | |
| 114 | |||
| 115 | ✗ | ico->images[i].size = avio_rl32(pb); | |
| 116 | ✗ | if (ico->images[i].size <= 0 || ico->images[i].size > INT_MAX - 14) { | |
| 117 | ✗ | av_log(s, AV_LOG_ERROR, "Invalid image size %d\n", ico->images[i].size); | |
| 118 | ✗ | return AVERROR_INVALIDDATA; | |
| 119 | } | ||
| 120 | ✗ | ico->images[i].offset = avio_rl32(pb); | |
| 121 | |||
| 122 | ✗ | if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0) | |
| 123 | ✗ | return AVERROR_INVALIDDATA; | |
| 124 | |||
| 125 | ✗ | codec = avio_rl32(pb); | |
| 126 | ✗ | switch (codec) { | |
| 127 | ✗ | case MKTAG(0x89, 'P', 'N', 'G'): | |
| 128 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_PNG; | |
| 129 | ✗ | st->codecpar->width = 0; | |
| 130 | ✗ | st->codecpar->height = 0; | |
| 131 | ✗ | break; | |
| 132 | ✗ | case 40: | |
| 133 | ✗ | if (ico->images[i].size < 40) | |
| 134 | ✗ | return AVERROR_INVALIDDATA; | |
| 135 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_BMP; | |
| 136 | ✗ | tmp = avio_rl32(pb); | |
| 137 | ✗ | if (tmp) | |
| 138 | ✗ | st->codecpar->width = tmp; | |
| 139 | ✗ | tmp = avio_rl32(pb); | |
| 140 | ✗ | if (tmp) | |
| 141 | ✗ | st->codecpar->height = tmp / 2; | |
| 142 | ✗ | break; | |
| 143 | ✗ | default: | |
| 144 | ✗ | avpriv_request_sample(s, "codec %d", codec); | |
| 145 | ✗ | return AVERROR_INVALIDDATA; | |
| 146 | } | ||
| 147 | } | ||
| 148 | |||
| 149 | ✗ | return 0; | |
| 150 | } | ||
| 151 | |||
| 152 | ✗ | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 153 | { | ||
| 154 | ✗ | IcoDemuxContext *ico = s->priv_data; | |
| 155 | IcoImage *image; | ||
| 156 | ✗ | AVIOContext *pb = s->pb; | |
| 157 | AVStream *st; | ||
| 158 | int ret; | ||
| 159 | |||
| 160 | ✗ | if (ico->current_image >= ico->nb_images) | |
| 161 | ✗ | return AVERROR_EOF; | |
| 162 | |||
| 163 | ✗ | st = s->streams[0]; | |
| 164 | |||
| 165 | ✗ | image = &ico->images[ico->current_image]; | |
| 166 | |||
| 167 | ✗ | if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0) | |
| 168 | ✗ | return ret; | |
| 169 | |||
| 170 | ✗ | if (s->streams[ico->current_image]->codecpar->codec_id == AV_CODEC_ID_PNG) { | |
| 171 | ✗ | if ((ret = av_get_packet(pb, pkt, image->size)) < 0) | |
| 172 | ✗ | return ret; | |
| 173 | } else { | ||
| 174 | uint8_t *buf; | ||
| 175 | ✗ | if ((ret = av_new_packet(pkt, 14 + image->size)) < 0) | |
| 176 | ✗ | return ret; | |
| 177 | ✗ | buf = pkt->data; | |
| 178 | |||
| 179 | /* add BMP header */ | ||
| 180 | ✗ | bytestream_put_byte(&buf, 'B'); | |
| 181 | ✗ | bytestream_put_byte(&buf, 'M'); | |
| 182 | ✗ | bytestream_put_le32(&buf, pkt->size); | |
| 183 | ✗ | bytestream_put_le16(&buf, 0); | |
| 184 | ✗ | bytestream_put_le16(&buf, 0); | |
| 185 | ✗ | bytestream_put_le32(&buf, 0); | |
| 186 | |||
| 187 | ✗ | if ((ret = avio_read(pb, buf, image->size)) != image->size) { | |
| 188 | ✗ | return ret < 0 ? ret : AVERROR_INVALIDDATA; | |
| 189 | } | ||
| 190 | |||
| 191 | ✗ | st->codecpar->bits_per_coded_sample = AV_RL16(buf + 14); | |
| 192 | |||
| 193 | ✗ | if (AV_RL32(buf + 32)) | |
| 194 | ✗ | image->nb_pal = AV_RL32(buf + 32); | |
| 195 | |||
| 196 | ✗ | if (st->codecpar->bits_per_coded_sample <= 8 && !image->nb_pal) { | |
| 197 | ✗ | image->nb_pal = 1 << st->codecpar->bits_per_coded_sample; | |
| 198 | ✗ | AV_WL32(buf + 32, image->nb_pal); | |
| 199 | } | ||
| 200 | |||
| 201 | ✗ | if (image->nb_pal > INT_MAX / 4 - 14 - 40U) | |
| 202 | ✗ | return AVERROR_INVALIDDATA; | |
| 203 | |||
| 204 | ✗ | AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4); | |
| 205 | ✗ | AV_WL32(buf + 8, AV_RL32(buf + 8) / 2); | |
| 206 | } | ||
| 207 | |||
| 208 | ✗ | pkt->stream_index = ico->current_image++; | |
| 209 | ✗ | pkt->flags |= AV_PKT_FLAG_KEY; | |
| 210 | |||
| 211 | ✗ | return 0; | |
| 212 | } | ||
| 213 | |||
| 214 | ✗ | static int ico_read_close(AVFormatContext * s) | |
| 215 | { | ||
| 216 | ✗ | IcoDemuxContext *ico = s->priv_data; | |
| 217 | ✗ | av_freep(&ico->images); | |
| 218 | ✗ | return 0; | |
| 219 | } | ||
| 220 | |||
| 221 | const FFInputFormat ff_ico_demuxer = { | ||
| 222 | .p.name = "ico", | ||
| 223 | .p.long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"), | ||
| 224 | .p.flags = AVFMT_NOTIMESTAMPS, | ||
| 225 | .priv_data_size = sizeof(IcoDemuxContext), | ||
| 226 | .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | ||
| 227 | .read_probe = probe, | ||
| 228 | .read_header = read_header, | ||
| 229 | .read_packet = read_packet, | ||
| 230 | .read_close = ico_read_close, | ||
| 231 | }; | ||
| 232 |