FFmpeg  4.3
xbmdec.c
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1 /*
2  * XBM image format
3  *
4  * Copyright (c) 2012 Paul B Mahol
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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/avstring.h"
24 
25 #include "avcodec.h"
26 #include "internal.h"
27 #include "mathops.h"
28 
29 static int convert(uint8_t x)
30 {
31  if (x >= 'a')
32  x -= 87;
33  else if (x >= 'A')
34  x -= 55;
35  else
36  x -= '0';
37  return x;
38 }
39 
40 static int parse_str_int(const uint8_t *p, int len, const uint8_t *key)
41 {
42  const uint8_t *end = p + len;
43 
44  for(; p<end - strlen(key); p++) {
45  if (!memcmp(p, key, strlen(key)))
46  break;
47  }
48  p += strlen(key);
49  if (p >= end)
50  return INT_MIN;
51 
52  for(; p<end; p++) {
53  char *eptr;
54  int64_t ret = strtol(p, &eptr, 10);
55  if ((const uint8_t *)eptr != p)
56  return ret;
57  }
58  return INT_MIN;
59 }
60 
61 static int xbm_decode_frame(AVCodecContext *avctx, void *data,
62  int *got_frame, AVPacket *avpkt)
63 {
64  AVFrame *p = data;
65  int ret, linesize, i, j;
66  int width = 0;
67  int height = 0;
68  const uint8_t *end, *ptr = avpkt->data;
69  const uint8_t *next;
70  uint8_t *dst;
71 
73  end = avpkt->data + avpkt->size;
74 
75  width = parse_str_int(avpkt->data, avpkt->size, "_width");
76  height = parse_str_int(avpkt->data, avpkt->size, "_height");
77 
78  if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
79  return ret;
80 
81  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
82  return ret;
83 
84  // goto start of image data
85  next = memchr(ptr, '{', avpkt->size);
86  if (!next)
87  next = memchr(ptr, '(', avpkt->size);
88  if (!next)
89  return AVERROR_INVALIDDATA;
90  ptr = next + 1;
91 
92  linesize = (avctx->width + 7) / 8;
93  for (i = 0; i < avctx->height; i++) {
94  dst = p->data[0] + i * p->linesize[0];
95  for (j = 0; j < linesize; j++) {
96  uint8_t val;
97 
98  while (ptr < end && *ptr != 'x' && *ptr != '$')
99  ptr++;
100 
101  ptr ++;
102  if (ptr < end && av_isxdigit(*ptr)) {
103  val = convert(*ptr++);
104  if (av_isxdigit(*ptr))
105  val = (val << 4) + convert(*ptr++);
106  *dst++ = ff_reverse[val];
107  if (av_isxdigit(*ptr) && j+1 < linesize) {
108  j++;
109  val = convert(*ptr++);
110  if (av_isxdigit(*ptr))
111  val = (val << 4) + convert(*ptr++);
112  *dst++ = ff_reverse[val];
113  }
114  } else {
115  av_log(avctx, AV_LOG_ERROR,
116  "Unexpected data at %.8s.\n", ptr);
117  return AVERROR_INVALIDDATA;
118  }
119  }
120  }
121 
122  p->key_frame = 1;
124 
125  *got_frame = 1;
126 
127  return avpkt->size;
128 }
129 
131  .name = "xbm",
132  .long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
133  .type = AVMEDIA_TYPE_VIDEO,
134  .id = AV_CODEC_ID_XBM,
135  .decode = xbm_decode_frame,
136  .capabilities = AV_CODEC_CAP_DR1,
137 };
AVCodec
AVCodec.
Definition: codec.h:190
av_isxdigit
static av_const int av_isxdigit(int c)
Locale-independent conversion of ASCII isxdigit.
Definition: avstring.h:251
convert
static int convert(uint8_t x)
Definition: xbmdec.c:29
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:355
ff_reverse
const uint8_t ff_reverse[256]
Definition: reverse.c:23
data
const char data[16]
Definition: mxf.c:91
AV_PIX_FMT_MONOWHITE
@ AV_PIX_FMT_MONOWHITE
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb.
Definition: pixfmt.h:75
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
parse_str_int
static int parse_str_int(const uint8_t *p, int len, const uint8_t *key)
Definition: xbmdec.c:40
x
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new please make sure they are as small as space on each network bandwidth and so on benefit from smaller test cases Also keep in mind older checkouts use existing sample that means in practice generally do not remove or overwrite files as it likely would break older checkouts or releases Also all needed samples for a commit should be ideally before the push If you need an account for frequently uploading samples or you wish to help others by doing that send a mail to ffmpeg devel rsync vauL Duo x
Definition: fate.txt:150
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
val
static double val(void *priv, double ch)
Definition: aeval.c:76
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
width
#define width
key
const char * key
Definition: hwcontext_opencl.c:168
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
mathops.h
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
AVPacket::size
int size
Definition: packet.h:356
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:186
height
#define height
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:197
len
int len
Definition: vorbis_enc_data.h:452
AVCodecContext::height
int height
Definition: avcodec.h:699
AV_CODEC_ID_XBM
@ AV_CODEC_ID_XBM
Definition: codec_id.h:209
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
avcodec.h
ret
ret
Definition: filter_design.txt:187
ff_xbm_decoder
AVCodec ff_xbm_decoder
Definition: xbmdec.c:130
AVCodecContext
main external API structure.
Definition: avcodec.h:526
xbm_decode_frame
static int xbm_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: xbmdec.c:61
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:104
AVPacket
This structure stores compressed data.
Definition: packet.h:332
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:699
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
avstring.h