| 1 | /* |
| 2 | * Microsoft Windows ICO muxer |
| 3 | * Copyright (c) 2012 Michael Bradshaw <mjbshaw gmail com> |
| 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 muxer |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/intreadwrite.h" |
| 28 | #include "libavutil/pixdesc.h" |
| 29 | #include "avformat.h" |
| 30 | |
| 31 | typedef struct { |
| 32 | int offset; |
| 33 | int size; |
| 34 | unsigned char width; |
| 35 | unsigned char height; |
| 36 | short bits; |
| 37 | } IcoImage; |
| 38 | |
| 39 | typedef struct { |
| 40 | int current_image; |
| 41 | int nb_images; |
| 42 | IcoImage *images; |
| 43 | } IcoMuxContext; |
| 44 | |
| 45 | static int ico_check_attributes(AVFormatContext *s, const AVCodecContext *c) |
| 46 | { |
| 47 | if (c->codec_id == AV_CODEC_ID_BMP) { |
| 48 | if (c->pix_fmt == AV_PIX_FMT_PAL8 && AV_PIX_FMT_RGB32 != AV_PIX_FMT_BGRA) { |
| 49 | av_log(s, AV_LOG_ERROR, "Wrong endianness for bmp pixel format\n"); |
| 50 | return AVERROR(EINVAL); |
| 51 | } else if (c->pix_fmt != AV_PIX_FMT_PAL8 && |
| 52 | c->pix_fmt != AV_PIX_FMT_RGB555LE && |
| 53 | c->pix_fmt != AV_PIX_FMT_BGR24 && |
| 54 | c->pix_fmt != AV_PIX_FMT_BGRA) { |
| 55 | av_log(s, AV_LOG_ERROR, "BMP must be 1bit, 4bit, 8bit, 16bit, 24bit, or 32bit\n"); |
| 56 | return AVERROR(EINVAL); |
| 57 | } |
| 58 | } else if (c->codec_id == AV_CODEC_ID_PNG) { |
| 59 | if (c->pix_fmt != AV_PIX_FMT_RGBA) { |
| 60 | av_log(s, AV_LOG_ERROR, "PNG in ico requires pixel format to be rgba\n"); |
| 61 | return AVERROR(EINVAL); |
| 62 | } |
| 63 | } else { |
| 64 | const AVCodecDescriptor *codesc = avcodec_descriptor_get(c->codec_id); |
| 65 | av_log(s, AV_LOG_ERROR, "Unsupported codec %s\n", codesc ? codesc->name : ""); |
| 66 | return AVERROR(EINVAL); |
| 67 | } |
| 68 | |
| 69 | if (c->width > 256 || |
| 70 | c->height > 256) { |
| 71 | av_log(s, AV_LOG_ERROR, "Unsupported dimensions %dx%d (dimensions cannot exceed 256x256)\n", c->width, c->height); |
| 72 | return AVERROR(EINVAL); |
| 73 | } |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static int ico_write_header(AVFormatContext *s) |
| 79 | { |
| 80 | IcoMuxContext *ico = s->priv_data; |
| 81 | AVIOContext *pb = s->pb; |
| 82 | int ret; |
| 83 | int i; |
| 84 | |
| 85 | if (!pb->seekable) { |
| 86 | av_log(s, AV_LOG_ERROR, "Output is not seekable\n"); |
| 87 | return AVERROR(EINVAL); |
| 88 | } |
| 89 | |
| 90 | ico->current_image = 0; |
| 91 | ico->nb_images = s->nb_streams; |
| 92 | |
| 93 | avio_wl16(pb, 0); // reserved |
| 94 | avio_wl16(pb, 1); // 1 == icon |
| 95 | avio_skip(pb, 2); // skip the number of images |
| 96 | |
| 97 | for (i = 0; i < s->nb_streams; i++) { |
| 98 | if (ret = ico_check_attributes(s, s->streams[i]->codec)) |
| 99 | return ret; |
| 100 | |
| 101 | // Fill in later when writing trailer... |
| 102 | avio_skip(pb, 16); |
| 103 | } |
| 104 | |
| 105 | ico->images = av_mallocz_array(ico->nb_images, sizeof(IcoMuxContext)); |
| 106 | if (!ico->images) |
| 107 | return AVERROR(ENOMEM); |
| 108 | |
| 109 | avio_flush(pb); |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static int ico_write_packet(AVFormatContext *s, AVPacket *pkt) |
| 115 | { |
| 116 | IcoMuxContext *ico = s->priv_data; |
| 117 | IcoImage *image; |
| 118 | AVIOContext *pb = s->pb; |
| 119 | AVCodecContext *c = s->streams[pkt->stream_index]->codec; |
| 120 | int i; |
| 121 | |
| 122 | if (ico->current_image >= ico->nb_images) { |
| 123 | av_log(s, AV_LOG_ERROR, "ICO already contains %d images\n", ico->current_image); |
| 124 | return AVERROR(EIO); |
| 125 | } |
| 126 | |
| 127 | image = &ico->images[ico->current_image++]; |
| 128 | |
| 129 | image->offset = avio_tell(pb); |
| 130 | image->width = (c->width == 256) ? 0 : c->width; |
| 131 | image->height = (c->height == 256) ? 0 : c->height; |
| 132 | |
| 133 | if (c->codec_id == AV_CODEC_ID_PNG) { |
| 134 | image->bits = c->bits_per_coded_sample; |
| 135 | image->size = pkt->size; |
| 136 | |
| 137 | avio_write(pb, pkt->data, pkt->size); |
| 138 | } else { // BMP |
| 139 | if (AV_RL32(pkt->data + 14) != 40) { // must be BITMAPINFOHEADER |
| 140 | av_log(s, AV_LOG_ERROR, "Invalid BMP\n"); |
| 141 | return AVERROR(EINVAL); |
| 142 | } |
| 143 | |
| 144 | image->bits = AV_RL16(pkt->data + 28); // allows things like 1bit and 4bit images to be preserved |
| 145 | image->size = pkt->size - 14 + c->height * (c->width + 7) / 8; |
| 146 | |
| 147 | avio_write(pb, pkt->data + 14, 8); // Skip the BITMAPFILEHEADER header |
| 148 | avio_wl32(pb, AV_RL32(pkt->data + 22) * 2); // rewrite height as 2 * height |
| 149 | avio_write(pb, pkt->data + 26, pkt->size - 26); |
| 150 | |
| 151 | for (i = 0; i < c->height * (c->width + 7) / 8; ++i) |
| 152 | avio_w8(pb, 0x00); // Write bitmask (opaque) |
| 153 | } |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static int ico_write_trailer(AVFormatContext *s) |
| 159 | { |
| 160 | IcoMuxContext *ico = s->priv_data; |
| 161 | AVIOContext *pb = s->pb; |
| 162 | int i; |
| 163 | |
| 164 | avio_seek(pb, 4, SEEK_SET); |
| 165 | |
| 166 | avio_wl16(pb, ico->current_image); |
| 167 | |
| 168 | for (i = 0; i < ico->nb_images; i++) { |
| 169 | avio_w8(pb, ico->images[i].width); |
| 170 | avio_w8(pb, ico->images[i].height); |
| 171 | |
| 172 | if (s->streams[i]->codec->codec_id == AV_CODEC_ID_BMP && |
| 173 | s->streams[i]->codec->pix_fmt == AV_PIX_FMT_PAL8) { |
| 174 | avio_w8(pb, (ico->images[i].bits >= 8) ? 0 : 1 << ico->images[i].bits); |
| 175 | } else { |
| 176 | avio_w8(pb, 0); |
| 177 | } |
| 178 | |
| 179 | avio_w8(pb, 0); // reserved |
| 180 | avio_wl16(pb, 1); // color planes |
| 181 | avio_wl16(pb, ico->images[i].bits); |
| 182 | avio_wl32(pb, ico->images[i].size); |
| 183 | avio_wl32(pb, ico->images[i].offset); |
| 184 | } |
| 185 | |
| 186 | av_freep(&ico->images); |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | AVOutputFormat ff_ico_muxer = { |
| 192 | .name = "ico", |
| 193 | .long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"), |
| 194 | .priv_data_size = sizeof(IcoMuxContext), |
| 195 | .mime_type = "image/vnd.microsoft.icon", |
| 196 | .extensions = "ico", |
| 197 | .audio_codec = AV_CODEC_ID_NONE, |
| 198 | .video_codec = AV_CODEC_ID_BMP, |
| 199 | .write_header = ico_write_header, |
| 200 | .write_packet = ico_write_packet, |
| 201 | .write_trailer = ico_write_trailer, |
| 202 | .flags = AVFMT_NOTIMESTAMPS, |
| 203 | }; |