Libav
img2enc.c
Go to the documentation of this file.
1 /*
2  * Image format
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  * Copyright (c) 2004 Michael Niedermayer
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/log.h"
26 #include "avformat.h"
27 #include "avio_internal.h"
28 #include "internal.h"
29 #include "libavutil/opt.h"
30 
31 typedef struct {
32  const AVClass *class;
34  int is_pipe;
35  char path[1024];
36  int update;
37 } VideoMuxData;
38 
40 {
41  VideoMuxData *img = s->priv_data;
42 
43  av_strlcpy(img->path, s->filename, sizeof(img->path));
44 
45  /* find format */
46  if (s->oformat->flags & AVFMT_NOFILE)
47  img->is_pipe = 0;
48  else
49  img->is_pipe = 1;
50 
51  return 0;
52 }
53 
55 {
56  VideoMuxData *img = s->priv_data;
57  AVIOContext *pb[3];
58  char filename[1024];
59  AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
60  int i;
61 
62  if (!img->is_pipe) {
63  if (img->update) {
64  av_strlcpy(filename, img->path, sizeof(filename));
65  } else if (av_get_frame_filename(filename, sizeof(filename), img->path, img->img_number) < 0 &&
66  img->img_number > 1) {
68  "Could not get frame filename number %d from pattern '%s'\n",
69  img->img_number, img->path);
70  return AVERROR(EIO);
71  }
72  for (i = 0; i < 3; i++) {
73  if (avio_open2(&pb[i], filename, AVIO_FLAG_WRITE,
74  &s->interrupt_callback, NULL) < 0) {
75  av_log(s, AV_LOG_ERROR, "Could not open file : %s\n", filename);
76  return AVERROR(EIO);
77  }
78 
79  if (codec->codec_id != AV_CODEC_ID_RAWVIDEO)
80  break;
81  filename[strlen(filename) - 1] = 'U' + i;
82  }
83  } else {
84  pb[0] = s->pb;
85  }
86 
87  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
88  int ysize = codec->width * codec->height;
89  avio_write(pb[0], pkt->data, ysize);
90  avio_write(pb[1], pkt->data + ysize, (pkt->size - ysize) / 2);
91  avio_write(pb[2], pkt->data + ysize + (pkt->size - ysize) / 2, (pkt->size - ysize) / 2);
92  avio_close(pb[1]);
93  avio_close(pb[2]);
94  } else {
96  AVStream *st = s->streams[0];
97  if (st->codec->extradata_size > 8 &&
98  AV_RL32(st->codec->extradata + 4) == MKTAG('j', 'p', '2', 'h')) {
99  if (pkt->size < 8 ||
100  AV_RL32(pkt->data + 4) != MKTAG('j', 'p', '2', 'c'))
101  goto error;
102  avio_wb32(pb[0], 12);
103  ffio_wfourcc(pb[0], "jP ");
104  avio_wb32(pb[0], 0x0D0A870A); // signature
105  avio_wb32(pb[0], 20);
106  ffio_wfourcc(pb[0], "ftyp");
107  ffio_wfourcc(pb[0], "jp2 ");
108  avio_wb32(pb[0], 0);
109  ffio_wfourcc(pb[0], "jp2 ");
110  avio_write(pb[0], st->codec->extradata, st->codec->extradata_size);
111  } else if (pkt->size < 8 ||
112  (!st->codec->extradata_size &&
113  AV_RL32(pkt->data + 4) != MKTAG('j', 'P', ' ', ' '))) { // signature
114 error:
115  av_log(s, AV_LOG_ERROR, "malformed JPEG 2000 codestream\n");
116  return -1;
117  }
118  }
119  avio_write(pb[0], pkt->data, pkt->size);
120  }
121  avio_flush(pb[0]);
122  if (!img->is_pipe) {
123  avio_close(pb[0]);
124  }
125 
126  img->img_number++;
127  return 0;
128 }
129 
130 #define OFFSET(x) offsetof(VideoMuxData, x)
131 #define ENC AV_OPT_FLAG_ENCODING_PARAM
132 static const AVOption muxoptions[] = {
133  { "start_number", "first number in the sequence", OFFSET(img_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, ENC },
134  { "update", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
135  { NULL },
136 };
137 
138 #if CONFIG_IMAGE2_MUXER
139 static const AVClass img2mux_class = {
140  .class_name = "image2 muxer",
141  .item_name = av_default_item_name,
142  .option = muxoptions,
143  .version = LIBAVUTIL_VERSION_INT,
144 };
145 
146 AVOutputFormat ff_image2_muxer = {
147  .name = "image2",
148  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
149  .extensions = "bmp,dpx,jpeg,jpg,ljpg,pam,pbm,pcx,pgm,pgmyuv,png,"
150  "ppm,sgi,tga,tif,tiff,jp2,xwd,sun,ras,rs,im1,im8,im24,"
151  "sunras,webp,xbm,j2c,pix",
152  .priv_data_size = sizeof(VideoMuxData),
153  .video_codec = AV_CODEC_ID_MJPEG,
157  .priv_class = &img2mux_class,
158 };
159 #endif
160 #if CONFIG_IMAGE2PIPE_MUXER
161 AVOutputFormat ff_image2pipe_muxer = {
162  .name = "image2pipe",
163  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
164  .priv_data_size = sizeof(VideoMuxData),
165  .video_codec = AV_CODEC_ID_MJPEG,
169 };
170 #endif
Bytestream IO Context.
Definition: avio.h:68
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1163
AVOption.
Definition: opt.h:234
#define OFFSET(x)
Definition: img2enc.c:130
int size
Definition: avcodec.h:974
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:295
Format I/O context.
Definition: avformat.h:922
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:38
int flags
can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, AVFMT_TS_NONSTRICT
Definition: avformat.h:465
AVOptions.
char path[1024]
Definition: img2enc.c:35
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
static const AVOption muxoptions[]
Definition: img2enc.c:132
uint8_t * data
Definition: avcodec.h:973
static int flags
Definition: log.c:44
static int write_header(AVFormatContext *s)
Definition: img2enc.c:39
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:67
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:941
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: img2enc.c:54
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:811
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:81
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
int void avio_flush(AVIOContext *s)
Definition: aviobuf.c:180
char filename[1024]
input or output filename
Definition: avformat.h:998
int width
picture width / height.
Definition: avcodec.h:1229
const char * name
Definition: avformat.h:446
#define AV_RL32
Definition: intreadwrite.h:146
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
Return in 'buf' the path with 'd' replaced by a number.
Definition: utils.c:2660
Stream structure.
Definition: avformat.h:699
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:416
NULL
Definition: eval.c:55
int img_number
Definition: img2enc.c:33
enum AVCodecID codec_id
Definition: avcodec.h:1067
AVIOContext * pb
I/O context.
Definition: avformat.h:964
av_default_item_name
Definition: dnxhdenc.c:52
main external API structure.
Definition: avcodec.h:1050
int extradata_size
Definition: avcodec.h:1165
Describe the class of an AVClass context structure.
Definition: log.h:33
int avio_open2(AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:794
#define ENC
Definition: img2enc.c:131
Main libavformat public API header.
int update
Definition: img2enc.c:36
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:409
enum AVCodecID ff_guess_image2_codec(const char *filename)
Definition: img2.c:97
int is_pipe
Definition: img2enc.c:34
void * priv_data
Format private data.
Definition: avformat.h:950
#define AVFMT_NODIMENSIONS
Format does not need width/height.
Definition: avformat.h:420
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:279
int stream_index
Definition: avcodec.h:975
#define MKTAG(a, b, c, d)
Definition: common.h:238
This structure stores compressed data.
Definition: avcodec.h:950