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path: root/libavformat/icodec.c (plain)
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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
34typedef struct {
35 int offset;
36 int size;
37 int nb_pal;
38} IcoImage;
39
40typedef struct {
41 int current_image;
42 int nb_images;
43 IcoImage * images;
44} IcoDemuxContext;
45
46static int probe(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
78static 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 ico->images = av_malloc_array(ico->nb_images, sizeof(IcoImage));
88 if (!ico->images)
89 return AVERROR(ENOMEM);
90
91 for (i = 0; i < ico->nb_images; i++) {
92 AVStream *st;
93 int tmp;
94
95 if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0)
96 break;
97
98 st = avformat_new_stream(s, NULL);
99 if (!st)
100 return AVERROR(ENOMEM);
101
102 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
103 st->codecpar->width = avio_r8(pb);
104 st->codecpar->height = avio_r8(pb);
105 ico->images[i].nb_pal = avio_r8(pb);
106 if (ico->images[i].nb_pal == 255)
107 ico->images[i].nb_pal = 0;
108
109 avio_skip(pb, 5);
110
111 ico->images[i].size = avio_rl32(pb);
112 if (ico->images[i].size <= 0) {
113 av_log(s, AV_LOG_ERROR, "Invalid image size %d\n", ico->images[i].size);
114 return AVERROR_INVALIDDATA;
115 }
116 ico->images[i].offset = avio_rl32(pb);
117
118 if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0)
119 break;
120
121 codec = avio_rl32(pb);
122 switch (codec) {
123 case MKTAG(0x89, 'P', 'N', 'G'):
124 st->codecpar->codec_id = AV_CODEC_ID_PNG;
125 st->codecpar->width = 0;
126 st->codecpar->height = 0;
127 break;
128 case 40:
129 if (ico->images[i].size < 40)
130 return AVERROR_INVALIDDATA;
131 st->codecpar->codec_id = AV_CODEC_ID_BMP;
132 tmp = avio_rl32(pb);
133 if (tmp)
134 st->codecpar->width = tmp;
135 tmp = avio_rl32(pb);
136 if (tmp)
137 st->codecpar->height = tmp / 2;
138 break;
139 default:
140 avpriv_request_sample(s, "codec %d", codec);
141 return AVERROR_INVALIDDATA;
142 }
143 }
144
145 return 0;
146}
147
148static int read_packet(AVFormatContext *s, AVPacket *pkt)
149{
150 IcoDemuxContext *ico = s->priv_data;
151 IcoImage *image;
152 AVIOContext *pb = s->pb;
153 AVStream *st = s->streams[0];
154 int ret;
155
156 if (ico->current_image >= ico->nb_images)
157 return AVERROR_EOF;
158
159 image = &ico->images[ico->current_image];
160
161 if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0)
162 return ret;
163
164 if (s->streams[ico->current_image]->codecpar->codec_id == AV_CODEC_ID_PNG) {
165 if ((ret = av_get_packet(pb, pkt, image->size)) < 0)
166 return ret;
167 } else {
168 uint8_t *buf;
169 if ((ret = av_new_packet(pkt, 14 + image->size)) < 0)
170 return ret;
171 buf = pkt->data;
172
173 /* add BMP header */
174 bytestream_put_byte(&buf, 'B');
175 bytestream_put_byte(&buf, 'M');
176 bytestream_put_le32(&buf, pkt->size);
177 bytestream_put_le16(&buf, 0);
178 bytestream_put_le16(&buf, 0);
179 bytestream_put_le32(&buf, 0);
180
181 if ((ret = avio_read(pb, buf, image->size)) != image->size) {
182 av_packet_unref(pkt);
183 return ret < 0 ? ret : AVERROR_INVALIDDATA;
184 }
185
186 st->codecpar->bits_per_coded_sample = AV_RL16(buf + 14);
187
188 if (AV_RL32(buf + 32))
189 image->nb_pal = AV_RL32(buf + 32);
190
191 if (st->codecpar->bits_per_coded_sample <= 8 && !image->nb_pal) {
192 image->nb_pal = 1 << st->codecpar->bits_per_coded_sample;
193 AV_WL32(buf + 32, image->nb_pal);
194 }
195
196 AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4);
197 AV_WL32(buf + 8, AV_RL32(buf + 8) / 2);
198 }
199
200 pkt->stream_index = ico->current_image++;
201 pkt->flags |= AV_PKT_FLAG_KEY;
202
203 return 0;
204}
205
206static int ico_read_close(AVFormatContext * s)
207{
208 IcoDemuxContext *ico = s->priv_data;
209 av_freep(&ico->images);
210 return 0;
211}
212
213AVInputFormat ff_ico_demuxer = {
214 .name = "ico",
215 .long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
216 .priv_data_size = sizeof(IcoDemuxContext),
217 .read_probe = probe,
218 .read_header = read_header,
219 .read_packet = read_packet,
220 .read_close = ico_read_close,
221 .flags = AVFMT_NOTIMESTAMPS,
222};
223
generated by cgit at 2024-05-17 06:10:58 (GMT)