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 "libavcodec/png.h"
31 #include "avformat.h"
32 #include "internal.h"
33
34 typedef struct {
35 int offset;
36 int size;
37 int nb_pal;
38 } IcoImage;
39
40 typedef struct {
41 int current_image;
42 int nb_images;
43 IcoImage * images;
44 } IcoDemuxContext;
45
probe(const AVProbeData * p)46 static int probe(const AVProbeData *p)
47 {
48 unsigned i, frames, checked = 0;
49
50 if (p->buf_size < 22 || AV_RL16(p->buf) || AV_RL16(p->buf + 2) != 1)
51 return 0;
52 frames = AV_RL16(p->buf + 4);
53 if (!frames)
54 return 0;
55 for (i = 0; i < frames && i * 16 + 22 <= p->buf_size; i++) {
56 unsigned offset;
57 if (AV_RL16(p->buf + 10 + i * 16) & ~1)
58 return FFMIN(i, AVPROBE_SCORE_MAX / 4);
59 if (p->buf[13 + i * 16])
60 return FFMIN(i, AVPROBE_SCORE_MAX / 4);
61 if (AV_RL32(p->buf + 14 + i * 16) < 40)
62 return FFMIN(i, AVPROBE_SCORE_MAX / 4);
63 offset = AV_RL32(p->buf + 18 + i * 16);
64 if (offset < 22)
65 return FFMIN(i, AVPROBE_SCORE_MAX / 4);
66 if (offset > p->buf_size - 8)
67 continue;
68 if (p->buf[offset] != 40 && AV_RB64(p->buf + offset) != PNGSIG)
69 return FFMIN(i, AVPROBE_SCORE_MAX / 4);
70 checked++;
71 }
72
73 if (checked < frames)
74 return AVPROBE_SCORE_MAX / 4 + FFMIN(checked, 1);
75 return AVPROBE_SCORE_MAX / 2 + 1;
76 }
77
read_header(AVFormatContext * s)78 static int read_header(AVFormatContext *s)
79 {
80 IcoDemuxContext *ico = s->priv_data;
81 AVIOContext *pb = s->pb;
82 int i, codec;
83
84 avio_skip(pb, 4);
85 ico->nb_images = avio_rl16(pb);
86
87 if (!ico->nb_images)
88 return AVERROR_INVALIDDATA;
89
90 ico->images = av_malloc_array(ico->nb_images, sizeof(IcoImage));
91 if (!ico->images)
92 return AVERROR(ENOMEM);
93
94 for (i = 0; i < ico->nb_images; i++) {
95 AVStream *st;
96 int tmp;
97
98 if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0)
99 goto fail;
100
101 st = avformat_new_stream(s, NULL);
102 if (!st) {
103 av_freep(&ico->images);
104 return AVERROR(ENOMEM);
105 }
106
107 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
108 st->codecpar->width = avio_r8(pb);
109 st->codecpar->height = avio_r8(pb);
110 ico->images[i].nb_pal = avio_r8(pb);
111 if (ico->images[i].nb_pal == 255)
112 ico->images[i].nb_pal = 0;
113
114 avio_skip(pb, 5);
115
116 ico->images[i].size = avio_rl32(pb);
117 if (ico->images[i].size <= 0) {
118 av_log(s, AV_LOG_ERROR, "Invalid image size %d\n", ico->images[i].size);
119 goto fail;
120 }
121 ico->images[i].offset = avio_rl32(pb);
122
123 if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0)
124 goto fail;
125
126 codec = avio_rl32(pb);
127 switch (codec) {
128 case MKTAG(0x89, 'P', 'N', 'G'):
129 st->codecpar->codec_id = AV_CODEC_ID_PNG;
130 st->codecpar->width = 0;
131 st->codecpar->height = 0;
132 break;
133 case 40:
134 if (ico->images[i].size < 40) {
135 goto fail;
136 }
137 st->codecpar->codec_id = AV_CODEC_ID_BMP;
138 tmp = avio_rl32(pb);
139 if (tmp)
140 st->codecpar->width = tmp;
141 tmp = avio_rl32(pb);
142 if (tmp)
143 st->codecpar->height = tmp / 2;
144 break;
145 default:
146 avpriv_request_sample(s, "codec %d", codec);
147 goto fail;
148 }
149 }
150
151 return 0;
152 fail:
153 av_freep(&ico->images);
154 return AVERROR_INVALIDDATA;
155 }
156
read_packet(AVFormatContext * s,AVPacket * pkt)157 static int read_packet(AVFormatContext *s, AVPacket *pkt)
158 {
159 IcoDemuxContext *ico = s->priv_data;
160 IcoImage *image;
161 AVIOContext *pb = s->pb;
162 AVStream *st;
163 int ret;
164
165 if (ico->current_image >= ico->nb_images)
166 return AVERROR_EOF;
167
168 st = s->streams[0];
169
170 image = &ico->images[ico->current_image];
171
172 if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0)
173 return ret;
174
175 if (s->streams[ico->current_image]->codecpar->codec_id == AV_CODEC_ID_PNG) {
176 if ((ret = av_get_packet(pb, pkt, image->size)) < 0)
177 return ret;
178 } else {
179 uint8_t *buf;
180 if ((ret = av_new_packet(pkt, 14 + image->size)) < 0)
181 return ret;
182 buf = pkt->data;
183
184 /* add BMP header */
185 bytestream_put_byte(&buf, 'B');
186 bytestream_put_byte(&buf, 'M');
187 bytestream_put_le32(&buf, pkt->size);
188 bytestream_put_le16(&buf, 0);
189 bytestream_put_le16(&buf, 0);
190 bytestream_put_le32(&buf, 0);
191
192 if ((ret = avio_read(pb, buf, image->size)) != image->size) {
193 return ret < 0 ? ret : AVERROR_INVALIDDATA;
194 }
195
196 st->codecpar->bits_per_coded_sample = AV_RL16(buf + 14);
197
198 if (AV_RL32(buf + 32))
199 image->nb_pal = AV_RL32(buf + 32);
200
201 if (st->codecpar->bits_per_coded_sample <= 8 && !image->nb_pal) {
202 image->nb_pal = 1 << st->codecpar->bits_per_coded_sample;
203 AV_WL32(buf + 32, image->nb_pal);
204 }
205
206 AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4);
207 AV_WL32(buf + 8, AV_RL32(buf + 8) / 2);
208 }
209
210 pkt->stream_index = ico->current_image++;
211 pkt->flags |= AV_PKT_FLAG_KEY;
212
213 return 0;
214 }
215
ico_read_close(AVFormatContext * s)216 static int ico_read_close(AVFormatContext * s)
217 {
218 IcoDemuxContext *ico = s->priv_data;
219 av_freep(&ico->images);
220 return 0;
221 }
222
223 AVInputFormat ff_ico_demuxer = {
224 .name = "ico",
225 .long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
226 .priv_data_size = sizeof(IcoDemuxContext),
227 .read_probe = probe,
228 .read_header = read_header,
229 .read_packet = read_packet,
230 .read_close = ico_read_close,
231 .flags = AVFMT_NOTIMESTAMPS,
232 };
233