FFmpeg
icoenc.c
Go to the documentation of this file.
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 {
41  int nb_images;
44 
46 {
47  if (p->codec_id == AV_CODEC_ID_BMP) {
49  av_log(s, AV_LOG_ERROR, "Wrong endianness for bmp pixel format\n");
50  return AVERROR(EINVAL);
51  } else if (p->format != AV_PIX_FMT_PAL8 &&
53  p->format != AV_PIX_FMT_BGR24 &&
54  p->format != 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 (p->codec_id == AV_CODEC_ID_PNG) {
59  if (p->format != 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 {
65  av_log(s, AV_LOG_ERROR, "Unsupported codec %s\n", codesc ? codesc->name : "");
66  return AVERROR(EINVAL);
67  }
68 
69  if (p->width > 256 ||
70  p->height > 256) {
71  av_log(s, AV_LOG_ERROR, "Unsupported dimensions %dx%d (dimensions cannot exceed 256x256)\n", p->width, p->height);
72  return AVERROR(EINVAL);
73  }
74 
75  return 0;
76 }
77 
79 {
80  IcoMuxContext *ico = s->priv_data;
81  AVIOContext *pb = s->pb;
82  int ret;
83  int i;
84 
85  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
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]->codecpar))
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  return 0;
110 }
111 
113 {
114  IcoMuxContext *ico = s->priv_data;
115  IcoImage *image;
116  AVIOContext *pb = s->pb;
117  AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
118  int i;
119 
120  if (ico->current_image >= ico->nb_images) {
121  av_log(s, AV_LOG_ERROR, "ICO already contains %d images\n", ico->current_image);
122  return AVERROR(EIO);
123  }
124 
125  image = &ico->images[ico->current_image++];
126 
127  image->offset = avio_tell(pb);
128  image->width = (par->width == 256) ? 0 : par->width;
129  image->height = (par->height == 256) ? 0 : par->height;
130 
131  if (par->codec_id == AV_CODEC_ID_PNG) {
132  image->bits = par->bits_per_coded_sample;
133  image->size = pkt->size;
134 
135  avio_write(pb, pkt->data, pkt->size);
136  } else { // BMP
137  if (AV_RL32(pkt->data + 14) != 40) { // must be BITMAPINFOHEADER
138  av_log(s, AV_LOG_ERROR, "Invalid BMP\n");
139  return AVERROR(EINVAL);
140  }
141 
142  image->bits = AV_RL16(pkt->data + 28); // allows things like 1bit and 4bit images to be preserved
143  image->size = pkt->size - 14 + par->height * (par->width + 7) / 8;
144 
145  avio_write(pb, pkt->data + 14, 8); // Skip the BITMAPFILEHEADER header
146  avio_wl32(pb, AV_RL32(pkt->data + 22) * 2); // rewrite height as 2 * height
147  avio_write(pb, pkt->data + 26, pkt->size - 26);
148 
149  for (i = 0; i < par->height * (par->width + 7) / 8; ++i)
150  avio_w8(pb, 0x00); // Write bitmask (opaque)
151  }
152 
153  return 0;
154 }
155 
157 {
158  IcoMuxContext *ico = s->priv_data;
159  AVIOContext *pb = s->pb;
160  int i;
161 
162  avio_seek(pb, 4, SEEK_SET);
163 
164  avio_wl16(pb, ico->current_image);
165 
166  for (i = 0; i < ico->nb_images; i++) {
167  avio_w8(pb, ico->images[i].width);
168  avio_w8(pb, ico->images[i].height);
169 
170  if (s->streams[i]->codecpar->codec_id == AV_CODEC_ID_BMP &&
171  s->streams[i]->codecpar->format == AV_PIX_FMT_PAL8) {
172  avio_w8(pb, (ico->images[i].bits >= 8) ? 0 : 1 << ico->images[i].bits);
173  } else {
174  avio_w8(pb, 0);
175  }
176 
177  avio_w8(pb, 0); // reserved
178  avio_wl16(pb, 1); // color planes
179  avio_wl16(pb, ico->images[i].bits);
180  avio_wl32(pb, ico->images[i].size);
181  avio_wl32(pb, ico->images[i].offset);
182  }
183 
184  return 0;
185 }
186 
188 {
189  IcoMuxContext *ico = s->priv_data;
190 
191  av_freep(&ico->images);
192 }
193 
195  .name = "ico",
196  .long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
197  .priv_data_size = sizeof(IcoMuxContext),
198  .mime_type = "image/vnd.microsoft.icon",
199  .extensions = "ico",
200  .audio_codec = AV_CODEC_ID_NONE,
201  .video_codec = AV_CODEC_ID_BMP,
205  .deinit = ico_deinit,
207 };
AVOutputFormat::name
const char * name
Definition: avformat.h:491
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:462
AVCodecDescriptor::name
const char * name
Name of the codec described by this descriptor.
Definition: codec_desc.h:46
IcoImage::width
unsigned char width
Definition: icoenc.c:34
pixdesc.h
AVPacket::data
uint8_t * data
Definition: packet.h:369
IcoMuxContext::current_image
int current_image
Definition: icoenc.c:40
av_mallocz_array
void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.c:190
AV_PIX_FMT_BGR24
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AV_PIX_FMT_BGRA
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
avio_wl16
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:455
ico_deinit
static void ico_deinit(AVFormatContext *s)
Definition: icoenc.c:187
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AVCodecDescriptor
This struct describes the properties of a single codec described by an AVCodecID.
Definition: codec_desc.h:38
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_CODEC_ID_BMP
@ AV_CODEC_ID_BMP
Definition: codec_id.h:127
ico_write_trailer
static int ico_write_trailer(AVFormatContext *s)
Definition: icoenc.c:156
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
AV_CODEC_ID_PNG
@ AV_CODEC_ID_PNG
Definition: codec_id.h:110
AVFormatContext
Format I/O context.
Definition: avformat.h:1231
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:203
IcoMuxContext
Definition: icoenc.c:39
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: packet.h:370
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
size
int size
Definition: twinvq_data.h:10344
ico_write_packet
static int ico_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: icoenc.c:112
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:225
AV_PIX_FMT_RGB32
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:372
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:375
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:729
AV_PIX_FMT_RGB555LE
@ AV_PIX_FMT_RGB555LE
packed RGB 5:5:5, 16bpp, (msb)1X 5R 5G 5B(lsb), little-endian, X=unused/undefined
Definition: pixfmt.h:108
i
int i
Definition: input.c:407
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
AVOutputFormat
Definition: avformat.h:490
AVCodecParameters::height
int height
Definition: codec_par.h:127
IcoImage
Definition: icodec.c:34
IcoMuxContext::images
IcoImage * images
Definition: icoenc.c:42
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
ret
ret
Definition: filter_design.txt:187
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
ff_ico_muxer
AVOutputFormat ff_ico_muxer
Definition: icoenc.c:194
avformat.h
IcoImage::offset
int offset
Definition: icodec.c:35
IcoImage::size
int size
Definition: icodec.c:36
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
IcoImage::height
unsigned char height
Definition: icoenc.c:35
AVPacket::stream_index
int stream_index
Definition: packet.h:371
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
AVCodecParameters::format
int format
Definition: codec_par.h:84
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:346
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
ico_check_attributes
static int ico_check_attributes(AVFormatContext *s, const AVCodecParameters *p)
Definition: icoenc.c:45
avcodec_descriptor_get
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3501
IcoImage::bits
short bits
Definition: icoenc.c:36
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
IcoMuxContext::nb_images
int nb_images
Definition: icoenc.c:41
ico_write_header
static int ico_write_header(AVFormatContext *s)
Definition: icoenc.c:78