| 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 "libavcodec/bytestream.h" |
| 29 | #include "libavcodec/bmp.h" |
| 30 | #include "avformat.h" |
| 31 | #include "internal.h" |
| 32 | |
| 33 | typedef struct { |
| 34 | int offset; |
| 35 | int size; |
| 36 | int nb_pal; |
| 37 | } IcoImage; |
| 38 | |
| 39 | typedef struct { |
| 40 | int current_image; |
| 41 | int nb_images; |
| 42 | IcoImage * images; |
| 43 | } IcoDemuxContext; |
| 44 | |
| 45 | static int probe(AVProbeData *p) |
| 46 | { |
| 47 | if (AV_RL16(p->buf) == 0 && AV_RL16(p->buf + 2) == 1 && AV_RL16(p->buf + 4)) |
| 48 | return AVPROBE_SCORE_MAX / 4; |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | static int read_header(AVFormatContext *s) |
| 53 | { |
| 54 | IcoDemuxContext *ico = s->priv_data; |
| 55 | AVIOContext *pb = s->pb; |
| 56 | int i, codec; |
| 57 | |
| 58 | avio_skip(pb, 4); |
| 59 | ico->nb_images = avio_rl16(pb); |
| 60 | |
| 61 | ico->images = av_malloc_array(ico->nb_images, sizeof(IcoImage)); |
| 62 | if (!ico->images) |
| 63 | return AVERROR(ENOMEM); |
| 64 | |
| 65 | for (i = 0; i < ico->nb_images; i++) { |
| 66 | AVStream *st; |
| 67 | int tmp; |
| 68 | |
| 69 | if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0) |
| 70 | break; |
| 71 | |
| 72 | st = avformat_new_stream(s, NULL); |
| 73 | if (!st) |
| 74 | return AVERROR(ENOMEM); |
| 75 | |
| 76 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 77 | st->codec->width = avio_r8(pb); |
| 78 | st->codec->height = avio_r8(pb); |
| 79 | ico->images[i].nb_pal = avio_r8(pb); |
| 80 | if (ico->images[i].nb_pal == 255) |
| 81 | ico->images[i].nb_pal = 0; |
| 82 | |
| 83 | avio_skip(pb, 5); |
| 84 | |
| 85 | ico->images[i].size = avio_rl32(pb); |
| 86 | ico->images[i].offset = avio_rl32(pb); |
| 87 | |
| 88 | if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0) |
| 89 | break; |
| 90 | |
| 91 | codec = avio_rl32(pb); |
| 92 | switch (codec) { |
| 93 | case MKTAG(0x89, 'P', 'N', 'G'): |
| 94 | st->codec->codec_id = AV_CODEC_ID_PNG; |
| 95 | st->codec->width = 0; |
| 96 | st->codec->height = 0; |
| 97 | break; |
| 98 | case 40: |
| 99 | if (ico->images[i].size < 40) |
| 100 | return AVERROR_INVALIDDATA; |
| 101 | st->codec->codec_id = AV_CODEC_ID_BMP; |
| 102 | tmp = avio_rl32(pb); |
| 103 | if (tmp) |
| 104 | st->codec->width = tmp; |
| 105 | tmp = avio_rl32(pb); |
| 106 | if (tmp) |
| 107 | st->codec->height = tmp / 2; |
| 108 | break; |
| 109 | default: |
| 110 | avpriv_request_sample(s, "codec %d", codec); |
| 111 | return AVERROR_INVALIDDATA; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
| 119 | { |
| 120 | IcoDemuxContext *ico = s->priv_data; |
| 121 | IcoImage *image; |
| 122 | AVIOContext *pb = s->pb; |
| 123 | AVStream *st = s->streams[0]; |
| 124 | int ret; |
| 125 | |
| 126 | if (ico->current_image >= ico->nb_images) |
| 127 | return AVERROR(EIO); |
| 128 | |
| 129 | image = &ico->images[ico->current_image]; |
| 130 | |
| 131 | if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0) |
| 132 | return ret; |
| 133 | |
| 134 | if (s->streams[ico->current_image]->codec->codec_id == AV_CODEC_ID_PNG) { |
| 135 | if ((ret = av_get_packet(pb, pkt, image->size)) < 0) |
| 136 | return ret; |
| 137 | } else { |
| 138 | uint8_t *buf; |
| 139 | if ((ret = av_new_packet(pkt, 14 + image->size)) < 0) |
| 140 | return ret; |
| 141 | buf = pkt->data; |
| 142 | |
| 143 | /* add BMP header */ |
| 144 | bytestream_put_byte(&buf, 'B'); |
| 145 | bytestream_put_byte(&buf, 'M'); |
| 146 | bytestream_put_le32(&buf, pkt->size); |
| 147 | bytestream_put_le16(&buf, 0); |
| 148 | bytestream_put_le16(&buf, 0); |
| 149 | bytestream_put_le32(&buf, 0); |
| 150 | |
| 151 | if ((ret = avio_read(pb, buf, image->size)) < 0) |
| 152 | return ret; |
| 153 | |
| 154 | st->codec->bits_per_coded_sample = AV_RL16(buf + 14); |
| 155 | |
| 156 | if (AV_RL32(buf + 32)) |
| 157 | image->nb_pal = AV_RL32(buf + 32); |
| 158 | |
| 159 | if (st->codec->bits_per_coded_sample <= 8 && !image->nb_pal) { |
| 160 | image->nb_pal = 1 << st->codec->bits_per_coded_sample; |
| 161 | AV_WL32(buf + 32, image->nb_pal); |
| 162 | } |
| 163 | |
| 164 | AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4); |
| 165 | AV_WL32(buf + 8, AV_RL32(buf + 8) / 2); |
| 166 | } |
| 167 | |
| 168 | pkt->stream_index = ico->current_image++; |
| 169 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | AVInputFormat ff_ico_demuxer = { |
| 175 | .name = "ico", |
| 176 | .long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"), |
| 177 | .priv_data_size = sizeof(IcoDemuxContext), |
| 178 | .read_probe = probe, |
| 179 | .read_header = read_header, |
| 180 | .read_packet = read_packet, |
| 181 | .flags = AVFMT_NOTIMESTAMPS, |
| 182 | }; |