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2ba45a60 DM |
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 | }; |