FFmpeg  4.3
img2_alias_pix.c
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1 /*
2  * Alias PIX image demuxer
3  * Copyright (c) 2014 Michael Niedermayer
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 #include "img2.h"
23 #include "libavcodec/bytestream.h"
24 
25 static int alias_pix_read_probe(const AVProbeData *p)
26 {
27  const uint8_t *b = p->buf;
28  const uint8_t *end = b + p->buf_size;
29  int width = bytestream_get_be16(&b);
30  int height = bytestream_get_be16(&b);
31  av_unused int ox = bytestream_get_be16(&b);
32  av_unused int oy = bytestream_get_be16(&b);
33  int bpp = bytestream_get_be16(&b);
34  int x, y;
35 
36  if (!width || !height)
37  return 0;
38 
39  if (bpp != 24 && bpp != 8)
40  return 0;
41 
42  for (y=0; y<2 && y<height; y++) {
43  for (x=0; x<width; ) {
44  int count = *b++;
45  if (count == 0 || x + count > width)
46  return 0;
47  if (b > end)
48  return AVPROBE_SCORE_MAX / 8;
49  b += bpp / 8;
50  x += count;
51  }
52  }
53 
54  return AVPROBE_SCORE_EXTENSION + 1;
55 }
56 
58  .class_name = "alias_pix demuxer",
59  .item_name = av_default_item_name,
60  .option = ff_img_options,
61  .version = LIBAVUTIL_VERSION_INT,
62 };
63 
65  .name = "alias_pix",
66  .long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
67  .priv_data_size = sizeof(VideoDemuxData),
71  .raw_codec_id = AV_CODEC_ID_ALIAS_PIX,
72  .priv_class = &image2_alias_pix_class,
73 };
alias_pix_read_probe
static int alias_pix_read_probe(const AVProbeData *p)
Definition: img2_alias_pix.c:25
av_unused
#define av_unused
Definition: attributes.h:131
end
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
b
#define b
Definition: input.c:41
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
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
AVInputFormat
Definition: avformat.h:636
width
#define width
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:641
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AV_CODEC_ID_ALIAS_PIX
@ AV_CODEC_ID_ALIAS_PIX
Definition: codec_id.h:226
VideoDemuxData
Definition: img2.h:41
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
ff_img_options
const AVOption ff_img_options[]
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
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
ff_img_read_header
int ff_img_read_header(AVFormatContext *s1)
Definition: img2dec.c:182
height
#define height
ff_image2_alias_pix_demuxer
AVInputFormat ff_image2_alias_pix_demuxer
Definition: img2_alias_pix.c:64
img2.h
uint8_t
uint8_t
Definition: audio_convert.c:194
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVClass::class_name
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:72
bytestream.h
image2_alias_pix_class
static const AVClass image2_alias_pix_class
Definition: img2_alias_pix.c:57
ff_img_read_packet
int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: img2dec.c:402