FFmpeg  4.4.5
icodec.c
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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 
34 typedef struct {
35  int offset;
36  int size;
37  int nb_pal;
38 } IcoImage;
39 
40 typedef struct {
42  int nb_images;
45 
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 
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 
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'):
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  }
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 
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  if (image->nb_pal > INT_MAX / 4 - 14 - 40)
207  return AVERROR_INVALIDDATA;
208 
209  AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4);
210  AV_WL32(buf + 8, AV_RL32(buf + 8) / 2);
211  }
212 
213  pkt->stream_index = ico->current_image++;
215 
216  return 0;
217 }
218 
220 {
221  IcoDemuxContext *ico = s->priv_data;
222  av_freep(&ico->images);
223  return 0;
224 }
225 
227  .name = "ico",
228  .long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
229  .priv_data_size = sizeof(IcoDemuxContext),
230  .read_probe = probe,
235 };
uint8_t
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:462
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_RB64
Definition: intreadwrite.h:164
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
#define fail()
Definition: checkasm.h:133
#define FFMIN(a, b)
Definition: common.h:105
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define NULL
Definition: coverity.c:32
@ AV_CODEC_ID_PNG
Definition: codec_id.h:110
@ AV_CODEC_ID_BMP
Definition: codec_id.h:127
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVInputFormat ff_ico_demuxer
Definition: icodec.c:226
static int ico_read_close(AVFormatContext *s)
Definition: icodec.c:219
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: icodec.c:157
static int read_header(AVFormatContext *s)
Definition: icodec.c:78
static int probe(const AVProbeData *p)
Definition: icodec.c:46
int i
Definition: input.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
#define PNGSIG
Definition: png.h:49
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int width
Video only.
Definition: codec_par.h:126
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int nb_images
Definition: icodec.c:42
IcoImage * images
Definition: icodec.c:43
int current_image
Definition: icodec.c:41
int nb_pal
Definition: icodec.c:37
int offset
Definition: icodec.c:35
int size
Definition: icodec.c:36
#define av_malloc_array(a, b)
#define avpriv_request_sample(...)
#define av_freep(p)
#define av_log(a,...)
static uint8_t tmp[11]
Definition: aes_ctr.c:27
AVPacket * pkt
Definition: movenc.c:59
int frames
Definition: movenc.c:66
static const uint8_t offset[127][2]
Definition: vf_spp.c:107